Digital battery

Since 1992, benefits of Sony lithium-ion batteries to achieve industrialization since, under its high specific energy, long life, no memory effect, safe, reliable and can quickly load and unload, lithium-ion batteries are become the new power technology recent years, development of hot spots. Lithium-ion Dell Latitude D810 battery is the green environment-friendly pollution free rechargeable batteries meet environmental needs of national energy today in all areas of use of life is increasing rapidly. Currently, lithium-ion has been widely used in mobile phones, laptops, digital cameras, MP3 and other electronic products, many of replacing nickel-cadmium batteries and nickel-hydride batteries, metal, in applications such as most as an exclusive Jiucheng. In addition, lithium-ion battery electric vehicles in recent years, and some other high power batteries have started to come into practical use.

 

Before 2000, the Japanese lithium-ion batteries dominate the world, and production accounting for about 95%. In recent years, with China (including Taiwan) and the rapid rise of South Korea, the Japanese show a single model has been gradually broken. Market Share of Japanese lithium-ion batteries has fallen below 60%, about one third of the world to form a pattern. Although in 2008 the global financial crisis hit, but rechargeable batteries, regardless of volume, sales were both up there on the rise, but this year will continue to be a difficult year. The future, the rapid development of a variety of electric vehicles, lithium-ion batteries will become a major driving force for progress.

 

The status of lithium-ion batteries can not be shaken

 

In 1989, the small size of the room-type lithium batteries to achieve a practical use. However, in the summer over a series of batteries for cell phones use lithium overheating in 1989 and caught fire due to an accident in early 1990, the industry uses a cylindrical, hp F2024B battery Rechargeable lithium had a negative attitude towards the prospects for practical application. However, Sony has specialized in the manufacturing technology of energy batteries Sony (Sony Energy Tech) ’s courage to break the deadlock, the same year in February announced the lithium-ion rechargeable battery reached a practical level.

 

Cause of the accident caused by lithium batteries that will be used as anode material for lithium in the charge and repeated discharge, the cathode is the formation of dendritic crystals, so a short - circuit between the positive and negative electrodes, emitting smoke and fire. The lithium-ion rechargeable battery in the positive and negative do not use lithium metal and its positive use of LiCoO2 (lithium cobalt) alloy material, the negative electrode material using carbon type of coke. This ensures the safety of the Dell KD476 battery to reach the cylinders of lithium type.

 

However, the practice at the beginning of the performance of lithium-ion battery was not significantly better than the main competing products - Ni-MH rechargeable batteries. For example, in early 1993 lithium-ion rechargeable battery unit volume density of energy 220Wh / L (This is a diameter of 65mm and 18mm × length value of the cylinder type battery, the same below ), just over nickel-metal hydride batteries 180Wh / height of approximately 20 L%. In addition, lithium-ion rechargeable batteries, there are many shortcomings, such as “there is no tension between compatibility and dry,” the difficulties of load control “,” high resistance, current high charging and discharging can be, “difficult to parallel, it is difficult to realize large capacity battery” and so on.

 

However, mobile phones and video cameras and other manufacturers of lithium-ion rechargeable VGP-BPS9A/B battery features lights a little low. Energy density per unit weight of these terms, lithium-ion battery than nickel-metal hydride rechargeable batteries is about twice as high as up 115Wh/kg. In other words, the same energy capacity, lithium-ion battery reduces the weight by about half. Thus, manufacturers of portable equipment, under a special favor in 1991 after the adoption of lithium-ion rechargeable batteries have the product market, and very popular. Since then, Matsushita Battery Industrial Company in 1992, Japan’s Battery in 1993, Sanyo Electric, Hitachi and Canada Moli Energy (1990) were commissioned in 1994, established the lithium-ion rechargeable batteries in portable electronics on the market can not shake the position.

 

Since 1990, lithium-ion rechargeable batteries have been largely along the high density and secure the development of these two main lines. To promote the products of small and light, manufacturers of portable electronic equipment urged to improve the energy density of batteries. However, the denser the smoke of the fire, the greater the risk. Incident does not happen again! The summer of 1989 fire incidents in the apple A1060 batteryof technical persistent spirit: If an accident, the use of materials of lithium battery will be the future is doomed.

 

To this end, in lithium-ion rechargeable batteries, the beginning of practical use, the battery manufacturer for its implementation will be known as the “most protective” of strict security measures. In order to fall in poor operation of the battery due to excessive discharge / over charge of the state can ensure security, the manufacturer of the battery configuration of the three types of security architecture: PTC (positive temperature coefficient) thermistor valve Security diaphragm. When mounted detected an abnormal temperature, the possibility of cutting off the electric mode of the load cell to avoid the danger.

 

In addition, development of mobile phones, cameras, computer hardware manufacturers have to ensure mobile security battery has played an important role. At that time, all the hardware manufacturers have established programs for acceptance testing, such as nail prick test, high temperature / low temperature test, as well as heating pan tests. Equipment manufacturers will be a series of tests based on the results raise the existing problems in the toshiba PA3591U-1BRS battery manufacturer, on how to improve the cell structure and design of safety circuits, and so many points of view. In the hard work in close cooperation with the early 20th century during the period, lithium-ion rechargeable batteries are no longer a major accident, the market is developing very well.

 

Improved security, the lithium-ion battery energy density of the battery continues to increase. The beginning of practical use in 1990, lithium-ion battery density of energy per unit volume, but 190Wh / L to 19 years later, in 2009, this value increased about 4 times, reaching 740Wh / L. But the same period, the microprocessor clock frequency up to 100 times the capacity of the DRAM is increased 250 times. Therefore, the rechargeable battery is also frequently called progress is too slow.

 

Increased energy density is mainly based on positive and negative materials to improve hp Pavilion dv4 battery of structural adjustment and improvement of manufacturing processes such as leather and complete been piecemeal. 19 years, there have been three times the material of great change, many, many times the energy density of high speed. The first took place in 1994 and 1995, the anode material of coke in a class of carbon materials, carbon, graphite type materials, this change so that the energy density has increased by about 20%. In the following 8 ~ 9 years, has maintained a positive use of LiCoO2, cathode graphite using a combination of such carbon material. The Change 2nd occurred in 2002 and 2003, the LiCoO2 cathode material in the LiCoO2 and Li (Ni-Co-Mn) O2 mixture of materials, the energy density of about 10%.

 

Is currently in 3rd period of change. The anode material is the reform candidate materials, including the type of silicon alloy, tin alloy and lithium three categories. An alloy of tin came in practical use. Sony introduced after the spring of 2005, the group of device battery has started to use this material. 14mm (diameter) x 43mm (length) of the unit cell volume of the energy density can reach 478Wh / L, compared to traditional materials, an increase of approximately 20% of the Dell Latitude D410 battery.

 

In January 2007, Matsushita Electric Industrial and Matsushita Battery Industrial through the use of certain types of materials such as alloy anode material, with successes to 740Wh / L energy density per unit volume. The company did not disclose the specific circumstances of this alloy material, until March this year, not mass production, it is expected that the near future or will be put to practice. In addition, the type of alloy of silicon and metal lithium as a cathode can significantly increase the energy density of batteries are also on trial.

 

After 2006, laptops and mobile phones and other products used in lithium-ion rechargeable batteries, the recurrence of an abnormal occurrence of heat, the potential fire hazard. Sony, Matsushita Battery Industrial, Sanyo Electric and other battery manufacturers have a large number of recycling batteries. The reasons are said to be mixed in the process of manufacturing powder metal, it is said to be load and unload equipment manufacturers in the management of misconduct. And equipment manufacturers face the cons, up another case of malfeasance.

 

In fact, the real reason not yet been identified. To this extent, must be carefully verified reason, understand that the resurgence ‘accident, the future is doomed, “the gravity of technical staff to learn both sides to ensure safety at all costs try to develop the spirit of time, work together to move forward together.