How do they Burst into Flame? > 자유게시판

Lithium-ion batteries are incredibly common these days. Yow will discover them in laptops, PDAs, Memory Wave cell phones and iPods. They're so widespread as a result of, pound for pound, they're a few of the most energetic rechargeable batteries obtainable. ­ Lithium-ion batteries have also been in the news lately. That’s because these batteries have the power to burst into flames sometimes. It's not quite common - just two or three battery packs per million have a problem - however when it occurs, it is excessive. In some situations, the failure price can rise, and when that occurs you end up with a worldwide battery recall that can value manufacturers hundreds of thousands of dollars. How do they burst into flame? And is there anything you can do to stop the problem or help your batteries final longer? In this article, we'll answer these questions and more. They're usually much lighter than different kinds of rechargeable batteries of the identical measurement.

The electrodes of a lithium-ion battery are product of lightweight lithium and carbon. Lithium is also a extremely reactive ingredient, which means that numerous vitality may be saved in its atomic bonds. This interprets into a really excessive power density for lithium-ion batteries. Here is a approach to get a perspective on the vitality density. A typical lithium-ion battery can store a hundred and fifty watt-hours of electricity in 1 kilogram of battery. A NiMH (nickel-metallic hydride) battery pack can retailer perhaps one hundred watt-hours per kilogram, although 60 to 70 watt-hours is perhaps extra typical. A lead-acid battery can retailer only 25 watt-hours per kilogram. Using lead-acid technology, it takes 6 kilograms to store the identical quantity of power that a 1 kilogram lithium-ion battery can handle. They hold their charge. A lithium-ion battery pack loses solely about 5 p.c of its charge per 30 days, compared to a 20 % loss per 30 days for NiMH batteries. They don't have any Memory Wave Method effect, which means that you do not need to utterly discharge them earlier than recharging, as with some other battery chemistries.

Lithium-ion batteries can handle a whole bunch of cost/discharge cycles. That's to not say that lithium-ion batteries are flawless. They begin degrading as quickly as they depart the manufacturing unit. They'll only final two or three years from the date of manufacture whether or not you employ them or not. They are extraordinarily sensitive to high temperatures. Heat causes lithium-ion battery packs to degrade a lot sooner than they normally would. When you fully discharge a lithium-ion battery, it's ruined. A lithium-ion battery pack should have an on-board laptop to manage the battery. This makes them even costlier than they already are. There's a small likelihood that, if a lithium-ion battery pack fails, it is going to burst into flame. Many of these characteristics will be understood by looking on the chemistry inside a lithium-ion cell. We'll take a look at this next. A battery charge state monitor, which is a small pc that handles the entire charging process to ensure the batteries charge as rapidly and fully as attainable.

If the battery pack will get too sizzling during charging or use, the pc will shut down the circulate of energy to try to cool issues down. When you leave your laptop in an especially sizzling automotive and take a look at to make use of the laptop computer, this computer may forestall you from powering up until issues cool off. If the cells ever change into utterly discharged, the battery pack will shut down as a result of the cells are ruined. It may also keep monitor of the variety of cost/discharge cycles and ship out data so the laptop computer's battery meter can tell you how a lot charge is left within the battery. This energy draw is one cause why lithium-ion batteries lose 5 % of their energy every month when sitting idle. As with most batteries you have an outer case manufactured from metal. The usage of metallic is especially essential here as a result of the battery is pressurized. This metal case has some sort of strain-delicate vent gap. If the battery ever will get so hot that it dangers exploding from over-stress, this vent will release the extra strain.