Battery technology change has been slow, unlike other fast-changing technology that gives people the feeling of adventure stimulation. 1800, Alessandro Volta invented the first Earl of a battery. Until 200 years after it emerged a major breakthrough: nickel chromium (NiCd) batteries. Since there has NiCd battery, have passed more than 40 years. But recently, two important forces have accelerated the changes in battery technology and laptop battery technology push to the forefront. First, the environmental concerns require replacement NiCd battery in the role of toxic chromium. Second, consumers of battery-powered portable products to demand
Is the rapid growth.
As a result, portable battery and a rechargeable battery in the battery industry has tremendous growth. Because so many hand-held wireless products require batteries as a power source, the thinkpad battery manufacturers have been putting in a lot of R & D to make batteries safer, more lightweight and have a higher energy density. This has always been to replace the nickel-chromium or nickel-metal hydride (NiMH) battery lithium batteries the main driver of growth.
There is no doubt that lithium-ion (Li-Ion) battery is the most technically advanced of a rechargeable battery. Its longer running time and in accordance with the protection of the environment to meet the demands of today's advanced information technology professionals demand. Compared with the NiMH battery types, lithium-ion battery is one of the main advantages of "no memory." NiMH batteries and different, lithium-ion batteries can discharge its cycle in a time of the rechargeable, and can maintain a very high charging efficiency, and more than older NiMH batteries to more than double. A rechargeable lithium ThinkPad T22 battery Another advantage is its weight, its energy density is three times the NiCd battery, but only half of its weight.
Lithium-ion batteries since the early 1990s since its introduction in portable power applications has become a major role, it has almost become cellular phones, personal digital assistant (PDA), digital camera (DSC) and MP3 players, the only powerÑ¡Ôñ. Large portable products need to increase the battery capacity and is a mature lithium-ion battery technology to increase capacity as possible.
Modern cellular phones, MP3 players and digital cameras (DSC) usually use 1 Ah to the battery capacity of 1.2 Ah, but sub-notebook computers may use 1.5 Ah to 2 Ah capacity ThinkPad T23 battery. Linear Technology Corporation currently used thermal regulation technology linear battery charger series has been successfully resolved the charger IC when the device is internal, high current linear regulators cause of the potential heating problems. Because the battery capacity has increased, and rapid charging the request still exist, so to maintain a reasonable demand that PCB temperature linear thermal regulation technology will become increasingly important.
And the "standard" than the lithium-ion battery, a new phosphate cathode of lithium-ion ThinkPad T30 battery has demonstrated a broader application. This update of the chemical composition to enhance the safety and reduce costs, but lower output voltage, if the use of the general 5 V wall adapter based on the linear regulators and the charger to recharge, then more Low output voltage will cause more heat problems. Therefore, this will require the use of switching or pulse charging solution.