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Hướng dẫn sạc pin đúng cách

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Hướng dẫn sạc pin đúng cách

Bài gửi  duyminh on Fri Sep 19, 2008 12:58 pm











Khi mới mua điện thoại di động máy tính xách tay, bạn thường phải sạc và xả pin trong ba lần đầu tiên để nâng cao tuổi thọ cho pin.
Ở lần đầu tiên, bạn cần cắm sạc liên tục khoảng 8-10 tiếng (nên tắt nguồn và sạc vào buổi tối).
Lần thứ hai và thứ ba cũng vậy, nhưng chú ý chỉ tiến hành sạc sau khi đã dùng cạn pin.
Với những lần sạc tiếp theo, bạn có thể sạc vào lúc máy báo dung lượng còn một vạch. Tránh tình trạng sạc lúc pin đẫ cạn kiệt, khi còn nhiều điện hoặc sạc để qua đêm.

Riêng đối với pin sạc cho máy ảnh số, MP3... thì cần chú ý đến dòng điện ghi trên pin (mAh) và trên bộ sạc (mA), và được tính như sau:

VD:
Nếu là pin NiCd (Nickel-cadmium battery):
pin AA 2500mAh, bộ sạc cho loại pin AA 225mA thì lấy 2500:225=12h
pin AAA 900mAh, bộ sạc cho loại pin AAA 150mA thì lấy 900:150=6h
Nếu là pin NiMH (nickel-metal hydride battery) thì nhân thêm hệ số 1.2
So a 100 mAh battery takes 120 mAh of energy to charge (that is, approximately 1 hour and fifteen minutes)

Charging
NiCd batteries can charge at several different rates, depending on how the cell was manufactured. The charge rate is measured based on the percentage of the amp-hour capacity the battery is fed as a steady current over the duration of the charge. Regardless of the charge speed, more energy must be supplied to the battery than its actual capacity, to account for energy loss during charging, with faster charges being more efficient. For example, the typical "overnight" charge, called a C/10 charge, is accomplished by applying 10% of the batteries total capacity for a period of 14 hours; that is, a 100 mAh battery takes 140 mAh of energy to charge at this rate. At the "fast charge" rate, done at 100% of the rated capacity, the battery holds roughly 80% of the charge, so a 100 mAh battery takes 120 mAh of energy to charge (that is, approximately 1 hour and fifteen minutes) The downside to faster charging is the higher risk of overcharging, which can damage the battery.[6]

The safe temperature range for a NiCd battery in use is between −20 °C and 45 °C. During charging, the battery temperature typically stays low, around 0°C (the charging reaction absorbs heat), but as the battery nears full charge the temperature will rise to 45–50 °C. Some battery chargers detect this temperature increase to cut off charging and prevent over-charging.

When not under load or charge, a NiCd battery will self-discharge approximately 10% per month at 20 °C, ranging up to 20% per month at higher temperatures. It is possible to perform a "trickle charge" at current levels just high enough to offset this discharge rate; to keep a battery fully charged. However, if the battery is going to be stored unused for a long period of time, it should be discharged down to at most 40% of capacity (some manufacturers recommend fully discharging, or even short-circuiting), and stored in a cool, dry environment.

http://en.wikipedia.org/wiki/Nickel_metal_hydride_battery

http://en.wikipedia.org/wiki/Nickel-cadmium_battery



Được sửa bởi duyminh ngày Fri Sep 19, 2008 1:02 pm; sửa lần 1.

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Re: Hướng dẫn sạc pin đúng cách

Bài gửi  duyminh on Fri Sep 19, 2008 12:58 pm


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Re: Hướng dẫn sạc pin đúng cách

Bài gửi  duyminh on Fri Sep 19, 2008 12:58 pm

Very Fast Battery Chargers for Future Electric Vehicles



Chrysalix Energy invested several million dollars in a Dutch-based maker of ultrafast battery chargers that aim the market of electric cars and plug-in hybrids. Epyon B.V.,produced a “supercharge” technology that reduces the charge time of lithium-ion batteries 20 times below the times reached by current chargers. Rene Savelsberg, managing director and CEO of SET Venture Partners, a European affiliate to Chrysalix, said: “Clearly, the bottleneck up to now has been the speed of re-charging and that is exactly what Epyon is good at”.
Epyon produces a computer controllable, very light charger that would reduce the charging time of an electric vehicle’s battery pack from 5 hours to 15 minutes, which is acceptable for most of the users. For the beginning, current gas stations could implement electric outlets that could feed the “juice” to the electric car, giving them the freedom of travelling longer distances without the fear of running out of electricity.
AccelRate, a company from Vancouver, is also working on similar fast-charging battery systems but they have not succeeded to make any viable product to this day, as they claim theyr system can only reduce a five hour lithium-ion charge down to an hour, which is an incredible loss of time for electric car users.

In 2010 GM, Toyota and other car manufacturers are expected to release commercially competing plug-in vehicles, the debate over quick-charge versus battery-swapping will continue to intensify. Shai Agassi, founder and CEO of Project Better Place, sees a network of battery swap stations located throughout the country. The electric car drivers could become members of this network, paying a subscription just as they would pay for mobile phone coverage. Israel and Denmark have so far subscribed to the idea, which is not new.

There are ups and downs to this idea as well, because the battery quality has to always be controlled, and maintenance work has to be done in order to supply a smooth-going business, which could rise the overall service’s price. The problem with fast-charging batteries is that they are going to last sensibly less than if recharged in a normal way, unless there is a new technology involved that would use something else for battery composition.

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