Item 1733

OTHER: Electrical - Power Storage - Battery

Lead Acid:

From supplier of batteries;

THUNDER-POWER-10-CELL-LITHIUM-BATTERIES Thunder Power RC eXtreme V2 5000mAh 37V 10 Cell Li Poly 10s 5000 Lithium Battery ~ $549.99 USD

5000mAh = 5Ah

 

Thunder Power RC 1010C Lithium Battery Charger & 210V Balancer ~ $289.90 USD

From ' Worlds lightesr effective prerotator' on Rotary Wing Forum

To power the setup, you run a 10-cell Lithium Polymer battery to the Brushless Controller. This type of battery, of 5000 or 6000mAh capacity, is the size of 1/2 a house brick.

The commonly seen milliampere-hour (mAh or mA·h) is one-thousandth of an ampere-hour or 3.6 coulombs

5000mAh = 18,000 coulombs

"is good for 5 to 8 prerotations" Therefore the capacitor must be 18,000 / (5 + 8 / 2) = 2,800 coulombs for a single rotoation.

Milliamp Hour (mAh)

Milliamps Hour (mAh) is important because it's the easiest way to distinguish the strength or capacity of a battery. The higher the mAh, the longer the battery will last. Batteries with different mAh ratings are interchangeable. If your battery is rechargeable then the mAh rating is how long the battery will last per charge.

Milliamps Hour is 1/1000th of a Amp Hour, so a 1000mAh = 1.0Ah

Think of a cars gas tank. Voltage is how much gas is being used, and mAh is the size of the gas tank. The bigger the gas tank (mAh) rating the longer the device will run. If your battery is rechargeable, then think of the gas tank as refillable (rechargeable).

 Coulombs: (C) is the SI unit of electric charge

Conventional ~ .12 Farads * 40VDC = 4.8 coulombs. This means that the must be 2.800 / 4.8 = 580 of the above capacitors at a price of $40,000.00 and a weight of 290 pounds.
Maxcap ~ 5.6 Farads * 40VDC = 224 coulombs. This means that the must be 2.800 / 4.8 = 12.5. 12.5 * 40 / 6) = 83 of the above capacitors at a price of $??? and a weight of 72 grams = 0.159 lb * 83 = 13 pounds.

Watt (W)

Energy: (W) [Joules], one watt is one Joule of energy transferred or dissipated in one second

C-rate:

The charge and discharge current of a battery is measured in C-rate. Most portable batteries are rated at 1C. This means that a 1000mAh battery would provide 1000mA for one hour if discharged at 1C rate. The same battery discharged at 0.5C would provide 500mA for two hours. At 2C, the 1000mAh battery would deliver 2000mA for 30 minutes. 1C is often referred to as a one-hour discharge; a 0.5C would be a two-hour, and a 0.1C a 10-hour discharge.

One battery that does not perform well at a 1C discharge rate is the portable sealed lead-acid. To obtain a reasonably good capacity reading, manufacturers commonly rate these batteries at 0.05C or 20 hour discharge. Even at this slow discharge rate, a 100% capacity is hard to attain. To compensate for different readings at various discharge currents, manufacturers offer a capacity offset. Applying the offset to correct the capacity readout does not improve battery performance; it merely adjusts the capacity calculation if discharged at a higher or lower C-rate than specified.

Lithium-ion/polymer batteries are electronically protected against high load currents. Depending on battery type, the discharge is limited to between 1C and 2C. This protection makes the lithium ion unsuitable for biomedical equipment and power tools demanding high inrush currents. Does this mean that there must be enough batteries to provide a minimum of 30 minutes of flying?

Reply from Rick; FYI, there are Li Polymer batteries available for the hobby industry that will handle 15-25C (short duration of course) without blowing up.

Batteries:

Moli Energy (Canada) Limited [Vancouver] http://www.molienergy.com/ Rick went out there. MODEL: ICR-18650J, Energy Density 188 Wh/kg

Lithium Technology Corporation; looks interesting http://www.lithiumtech.com/ Their best is the 60 Ah HE-602050 Lithium Ion Cell, 150 WH/Kg, Nominal voltage 3.60 V, Nominal capacity at 0.2 C 60 Ah, Weight approx. 1500 g

Permanent Magnet Products; http://www.stanfordmagnets.com/magnet.html

Zinc Bromide Battery:

http://www.dsbg.com/brome/brome.nsf/6c5af8b7f14637034225683f0045e365/252636761189d13542256bcd00280ac9?OpenDocument&Click=

http://www.transportation.anl.gov/pdfs/TA/103.pdf#search=%22%22zinc%20Bromide%20Battery%22%20OR%20%22zinc%20Bromide%20Batteries%22%22

Primary Zinc-Air 300 Wh/kg Is this a battery of a fuell cell

 

 Large lithium battery storage; http://www.hymotion.com/products.htm. Lithium batteries. 160 lbs. 16" x 33" 10" high. 5 KW hours.

 

Thunder Power High Performance Lithium Polymer

Example;

Item Part # ~ TP9000-6S2PX

Description Capacity/voltage ~ 22.2V 9000mAh 6S2P

Max Cont. Discharge ~ 20C

Sustain Discharge ~ 30C

Max Burst Discharge ~ 50C

Max Cont. Current ~ 180A

Max Burst Current ~ 450A

Weight Grams ~ 1332

Dimensions H x W x L ~ 73 x48 x195

MAP Price ~ 599.99

Retail ~ 599.99

Altairnano Rick says that this is the best so far.

Duralite Batteries Lithium-Manganese

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EEStor:

To Rick;

This is the patent of the company that Zenn bought into.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7,033,406.PN.&OS=PN/7,033,406&RS=PN/7,033,406
or go to http://patft.uspto.gov/netahtml/PTO/srchnum.htm and enter the patent number 7,033,406.
From patent;
"the capability to store electrical energy in the range of 52 kWh. The total weight of an EESU with this range of electrical energy storage is about 336 pounds."
5 lbs per hp-hr

From Rick;

Interesting that with these specs, a unit providing 12Kwh would weigh approx. 78 lbs. This would give us about an hour flight, considering takeoff of 1 min to altitude and cruising at 45% power. Not bad. The big bonus is never having to replace the unit for the life of the helicopter.

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From Rick; July 15, 2009

More good news -Polyplus Co in Berkely Calif. have found a way to create Li ion batteries with energy density of 4000Wh/kg compared to present 160Wh/kg! Presently they can only cycle about 50 times but 25 times current technology is amazing. It really means there are possibilities still undiscovered that could reduce dependence on lithium itself. A good application for this woud be a portable backpack helicopter for airlifting a trooper out of enemy territory. It would only need a 13 lb. battery pack for a 1/2 hr. flight time. Care to design something for a military contract?
Rick

http://www.polyplus.com/index.htm

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From Rick; August 6, 2009

Check this one out: Drawback - cannot draw full energy rating for very long (< 10 min). Need to buy energy cartridges from supplier.

http://www.horizonfuelcell.com/aerospace.htm

http://www.horizonfuelcell.com/file/aeropak.pdf

From Rick; September 7, 2009

Air-fuelled STAIR battery could last ten times longer than traditional cells. http://www.engadget.com/2009/05/23/air-fuelled-stair-battery-could-last-ten-times-longer-than-tradi/

From Graviman; September 22, 2009

Saft batteries

From Rotary Wing; September 22, 2009

One of the most promising is the work being done at Stanford University using silicon nanowire for the anode of a lithium battery increasing the theoretical capacity by a factor of 10. http://www.nature.com/nnano/journal/...o.2007.411.pdf

Impedance Analysis of Silicon Nanowire Lithium Ion Battery Anodes ~ Saved on E-drive

From Rick; November 5, 2009

http://www.technologyreview.com/energy/23877/page1/

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Last Revised: August 14, 2010