2011年1月7日星期五

A Cool Laptop Battery Technology by goodlaptopbattery.com.au

goodlaptopbattery.com.au – A Cool Laptop Battery Technology







The world’s first mass-produced electric car won’t be in New Zealand until next year, but the Washington Post’s WARREN BROWN has already driven it.



The outside temperature was minus three degrees Celsius. The air on this clear, moonlit night looked ice blue. It was the tail end of the Christmas shopping season. The stores were open late.



I could feel Mary Anne’s anxiety.



“It works in the cold?” she said.



I assured her that the 2011 Nissan Leaf SL, arguably the first all-electric car that is a bona fide reasonably affordable automobile, replete with nearly all the things consumers have come to expect in, and of automobiles, operated just fine in extreme temperatures.



“Heat!” Mary Anne ordered.



My wife is fond of one-word commands, the result of decades of teaching elementary-school children.



I turned on the Leaf SL’s heater, adjusting the cabin temperature to 23C. Immediately, the Leaf SL’s electronic range monitor, on the instrument panel directly behind the steering wheel, changed to indicate 105 kilometres of driving range, 20km less than a previously displayed distance of 125km.



Mary Anne’s nervousness increased. She suggested we turn back home, park the Leaf and take an available car with a traditional gasoline engine. I insisted that we stay the course in the Leaf SL.



“What if we run out of power? How do we get home?” she said.



“No problem,” I said. I regaled her with tales of my globe-trotting travels – how I could always find an electrical outlet, somewhere to plug in and recharge the lithium-ion batteries of my laptop, iPod or camera and keep going.







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The Leaf, available as the base SV and the upgraded SL driven for this column, is the first all-electric car with a lithium-ion battery pack, much like the battery packs in laptop computers. Lithium-ion batteries are lighter and hold more power than the comparably sized nickel-metal-hydride batteries used in most available electric vehicles and gas-electric hybrids.







I thought these factual nuggets would impress Mary Anne. They didn’t. “It’s freezing out here. I want to get home … tonight!”



Therein resides the promise and problem of all-electric vehicles. They make perfect sense for the kind of driving 90 per cent of us do every day – round trips to work, shopping centres, school, medical appointments and houses of worship. Many of those trips are 65km or less. Fully charged, the Leaf’s 48 lithium-ion battery modules, snugly located beneath the car’s floorboards, offer a 160km range.



Range, as indicated by the winter’s tale described herein, is affected by temperature, often negatively. The use of power-needy devices such as heaters and air conditioners has a similar effect.



But even in extreme temperatures and with power-consumption devices in use, most routine commuter round trips in a Leaf can be completed without worry.



Fully recharging the car’s battery modules using ordinary United States house current – 115 to 120 volts – would take 20 hours. That means most Leaf buyers will wind up spending NZ$5000 to install a rapid-charge home-charging station designed for Nissan by AeroVironment of Monrovia, California – a technology company specialising in electric vehicle systems. In New Zealand, with 240-volt systems, a recharge will take a more useful 10 hours.



The AeroVironment charger reduces the Leaf’s charge time to three to eight hours, depending on the car’s state of charge at time of hookup. Sparsely available commercial “quick-charge” stations can reduce charge times to 30 minutes.







All that might seem an unwelcome hassle to the fuel-up-and-go crowd. All-electric cars are not appealing to, nor are they ideal for, everybody.



The Leaf, for example, is not the car for a one-car family, unless that family has a daily round-trip commuting routine of about 100km, or less – to allay any hint of range anxiety.



But I really like this little car. So does Mary Anne, who warmed up to it considerably after safely returning from our late-winter’s-night shopping trip.



“So, hmm, looks like I could use this car to go to school every day without worrying about pumping gasoline,” she said.



An aside for the record: Mary Anne never pumps gasoline … or diesel. I do that – always, every time, regardless of season or weather, even when her premium-gasoline-fed Mini Cooper needs refuelling.



Mary Anne was referring to peace of mind. Happily, the Leaf provides that for those of us worried about endangering our breathing and national security with unnecessary expenditures of gasoline. It’s not perfect. But it’s a good turn of the wheel in the right direction.



NUTS AND BOLTS



Bottom line: The Nissan Leaf SL is a real automobile. That’s the first and most appealing thing about it.



As an all-electric with a 160-kilometre range per full charge, it makes perfect sense as an everyday commuter vehicle, especially in traffic-congested city centres. Ride, acceleration and handling: The Leaf SL gets excellent marks in all three.







Handling is surprisingly good. Credit goes to the beneath-the-floorboards location of the lithium-ion battery pack, which gives the Leaf a favourable centre of gravity.  All-electric vehicles are direct-drive machines in which power is sent to drive wheels without need of geared transmission. Torque is instant.



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