25.03.2011., petak
Why Dell Studio 1555 Laptop battery explosion
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Generally speaking, the current Dell Studio 1555 Battery themselves have good comprehensive protection. It not only form with multiple series / parallel batteries, the circuit board itself also contains two modules: Protection PCB module and Smart Battery Gauge Board module, a set of battery protection design includes first-level protection IC (to prevent battery over charge, over discharge, short circuit), the second-level protection IC (to prevent a second over-voltage), fuses, LED indication, temperature control and other components. In the multi-level protection mechanism, even the power charger, computer in an anomalous situation, the laptop battery can only be converted to automatic protection status, if the situation is not serious, often still work after re-plug, not explosion. According to analysis, Dell 1555 Battery explosion caused by a short circuit or overcharge, most likely when in lithium batteries manufacture, because the manufacturing process itself is flawed, leaving the existence of product safety problems that may occur at any time, such as the two poles that should be insulation but metal dust or copper foil and aluminum foil membrane perforation burr between it, resulting in micro short circuit. The former is the most serious, it will directly cause a short circuit, and a lot of heat, resulting in vaporization of some of the electrolyte, the battery cover stretch . In addition, there is a very special situation, power charger or computer due to special reasons, instantly to lithium battery provides the high voltage/strong currents which leads to serious overcharge, such as by recharging voltage mbm1260 V suddenly rises to 12.9 V is even higher then would have a high flow produce, battery charging circuit inside the recharge current should be cut off, but action because of lithium battery charge over voltage, over current protection function design is very weak, this may lead to battery protection IC damage, Making Studio 1555 Battery lose protection function and damaged, extremely chip after the overcharge around needle lithium metal crystallization, piercing point lead to several micro short circuit, cause the battery temperature gradually raised, until finally the battery explosion, fire of the phenomenon, which is now a lot of laptop battery "mess" main reasons. |
