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Topic: Flow Battery

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	Flow Batteries: Improving Battery Technology for Electric Vehicles
		In a flow battery, the reactants are in solution instead of in solid plates (as in the lead-acid battery).
		The vanadium-flow-redox battery may be an excellent alternative to lead-acid batteries for electric vehicles.
		The vanadium battery should be lighter and have a longer lifetime, and the vanadium compounds in the battery are less toxic than lead compounds.
	www.chemistry.wustl.edu /~courses/genchem/Tutorials/AirQuality/flow.htm (597 words)

	Battery (electricity) (Site not responding. Last check: 2007-10-07)
		Although such storage in an electrostatic form is practical in some specialized uses, batteries usually consist of electrochemical devices such as one or more galvanic cells or more recently fuel cells, and may in the future use other technologies.
		The oldest form of rechargeable battery still in modern usage is the wet cell lead-acid battery.
		This battery is notable in that it contains a liquid in an unsealed container, requiring that the battery be kept upright and the area be well-ventilated to deal with the explosive oxygen and hydrogen gases which are vented by these batteries during overcharging.
	hallencyclopedia.com /Battery_(electricity) (2334 words)

	Australian Island Using Flow Batteries To Store Wind Power : MetaEfficient
		Flow batteries like this have the advantage that their storage capacity can be expanded easily and cheaply by building larger tanks and adding more chemicals.
		Flow batteries, in contrast, use two electrolyte solutions, each with a different "redox potential" - a measure of the electrolyte molecules' affinity for electrons.
		When Skyllas-Kazacos added the solution to the two chambers of her flow battery and connected an outside power supply to the electrodes, she found that the vanadium at the positive electrode changed into the V(v) form while at the negative electrode it all converted to the V(ii) form.
	www.metaefficient.com /archives/renewable-power/australian-island-using-flow-batteries-to-store-wind-power.html (1831 words)

	Entrance Battery Encyclopedia (Site not responding. Last check: 2007-10-07)
		Operation of a dc system with the battery, the battery charger, and the load all connected in parallel and with the battery charger supplying the normal dc load plus any self-discharge or charging current, or both, required by the battery.
		The change in voltage at the terminals of a cell when a specified current is flowing into the cell; it is equal to the difference between the actual cell voltage and the open circuit voltage, exclusive of the internal voltage drop.
		Is the number of Ampere hours a battery can deliver during a continuous discharge at a current (in Amperes) numerically expressed as a percentage of the nominal capacity of the battery or during a continuous discharge at a specified discharge rate.
	www.cyb.com.au /encyclopedia/default.htm (4569 words)

	Renewable. Rechargeable. Remarkable - Science - RedOrbit (Site not responding. Last check: 2007-10-07)
		Flow batteries essentially comprise two key elements: cell stacks, where power is converted from electrical form to chemical form, and tanks of electrolytes where energy is stored.
		While a flow battery using an electrolyte solution doesn't have the same energy density as a fuel cell using hydrogen as an energy carrier, for most grid applications high energy density is not a key design factor.
		The notion of complementary ramp rates-of flow batteries and peaking plants matching the falloff from wind farms-is beginning to be discussed and fine-tuned by utility planners.
	www.rednova.com /news/science/276496/renewable_rechargeable_remarkable/index.html?source=r_science (2470 words)

	Flow Batteries Management Report
		Flow batteries can be built with a much greater storage capacity than most other battery types.
		In addition to electrical recharging, flow batteries can be rapidly replenished by electrolyte exchange (and, in a recent innovation with implications for the fuel cell industry, by converting the chemical energy in a feedstock).
		The focus is on flow batteries, together with redox hybrid and non-flow redox systems, and coverage includes issues that still need to be resolved, which are often glossed over elsewhere.
	www.escovale.com /es/flow_management_report.htm (1294 words)

	Water Flow Analog of Electrical Current
		The flow of water through a pipe has enough in common with the flow of electrons in a wire that examining their connection can help us understand both.
		Water flow in a pipe is measured by the amount of water that flows past a point per second – the mass flow rate.
		Electrical flow in a wire is measured by the amount of charge that flow past a point per second – the charge flow rate or current I.
	www.ac.wwu.edu /~vawter/PhysicsNet/Topics/DC-Current/WaterFlowAnalog.html (1251 words)

	Flow Batteries
		Flow batteries allow storage of the active materials external to the battery and these reactants are circulated through the cell stack as required.
		Modern flow batteries are generally two electrolyte systems in which the two electrolytes are pumped through the cell.
		When the Zinc-Bromine battery is completely discharged, all the metal Zinc plated on the negative electrodes is dissolved in the electrolyte and again produced the next time the battery is charged.
	www.mpoweruk.com /flow.htm (418 words)

	Status of the Vanadium Redox Battery Development Program (Site not responding. Last check: 2007-10-07)
		In connecting individual cells in series to form a battery stack, bipolar electrodes are employed and flow to the cells is hydraulically in parallel performed by the use of manifolds.
		In most redox flow batteries different metal species are employed in the positive and negative half-cell electrolytes as in the case of the iron-chromium (Fe-Cr) redox cell.
		The battery voltage for the stationary vehicle with the pumps on was 38.9V and the battery voltage for the moving vehicle on a flat road was 37.6V.
	www.ceic.unsw.edu.au /centers/vrb/eec94a.htm (2963 words)

	Paths to power: How a battery works - CNET reviews
		Not to be confused with computer memory, this is the loss of the ability to fully recharge a battery, which happens over a long period of battery use.
		This is the main battery capacity rating, equal to one-thousandth of an amp-hour, generally referred to by its acronym: mAh.
		This is a battery that can be used repeatedly by adding power to it when the cells are drained.
	reviews.cnet.com /4520-3121_7-5127099-6.html (534 words)

	Centech Wiring Tips and Tricks
		The amount of current flow is determined by the resistance of the device and the size of the wires going to the device.
		Resistance to the flow of water and resistance to the flow of battery current is essentially the same thing.
		Using the frame as an electrical path the the battery (-) terminal is an efficient method of wiring the ground portion of your vehicle.
	www.centechwire.com /info/archive/grounds.html (870 words)

	Battery Town
		If the battery is not charged at the right pressure or does not receive adequate charge because of the amount of current flow or the duration of charge, then it will not be able to deliver if required.
		When the battery is recharged to near full charge the resulting higher voltage causes production of the bubbles of hydrogen and oxygen which gradually move up through the electrolyte and out through the vent plugs in the top of each cell.
		Batteries fitted to cars are required to provide a very high cranking current to start the engine for a short time.
	www.batterytown.co.nz /battery_simple.htm (2710 words)

	Battery Management 101
		Sometimes they forget about the need to maintain the battery water level and to keep it fully charged when their RV is in storage.
		To reduce water loss even more, once the Battery Tank is fully charged the height of Charger Tank must lowered to 13.2-Ft. This lower height reduces the flow from the Charger Tank so that it just equals water lost due to the leak at the bottom of Battery Tank.
		This normal conversion of water into hydrogen and oxygen is part of the battery recharge cycle and is another reason you should check the battery water level at least once a month.
	www.progressivedyn.com /battery_manage_101.html (1625 words)

	Vanadium Redox Flow Battery Cell VRB Flow Cells Electrochemical Redox Flow Cell - Sydney Water Desalination Kurnell
		The Redox Flow Cell is an electrochemical system which allows energy to be stored in two solutions containing different redox couples with electrochemical potentials sufficiently separated from each other to provide an electromotive force to drive the oxidation-reduction reactions needed to charge and discharge the cell.
		Unlike conventional batteries, the redox flow cell stores energy in the solutions, so that the capacity of the system is determined by the size of the electrolyte tanks, while the system power is determined by the size of the cell stacks.
		To date, flow batteries have mainly been used to assist with load levelling for substations and in buildings or in small isolated storage systems.
	www.zulenet.com /electriceco/VRB_flow_cell.html (455 words)

	"Renewable. Rechargeable. Remarkable.", Feature Article, September 2005
		Flow batteries can turn intermittent wind power from a utility manager's headache to a green and reliable energy source.
		The notion of complementary ramp rates—of flow batteries and peaking plants matching the falloff from wind farms—is beginning to be discussed and fine-tuned by utility planners.
		Utilities such as J-Power and PacifiCorp, by installing flow batteries on their grids, are providing invaluable real-world proving grounds and racking up years of performance records that will ultimately make or break the market.
	www.memagazine.org /contents/current/features/rerere/rerere.html (2447 words)

	The Lemon Battery Challenge (Site not responding. Last check: 2007-10-07)
		The flow of electrons is called an electrical current and is measured in Amperes --- when 6 million million million electrons flow through an electrical circuit in one second,the current is approximately 1 Ampere (6,000,000,000,000,000,000 electrons = 1 Ampere).
		As water flowing downhill through a pipe encounters friction, electrons flowing through the filament of the light bulb encounter friction and release energy -- this is electrical resistance.
		Dry cells (such as flashlight batteries) are the alkaline batteries that use a powder chemical for an electrolyte; wet cells (such as car batteries) use acids as the electrolyte.
	www.eweek.org /site/DiscoverE/activities/lemon.shtml (1220 words)

	Distributed Energy Resources Guide: equipment- Energy Storage / UPS Systems
		Flow batteries differ from conventional rechargeable batteries in one significant way: the power and energy ratings of a flow battery are independent of each other.
		This is made possible by the separation of the electrolyte and the battery stack (or fuel cell stack).
		A flow battery, on the other hand, stores and releases energy by means of a reversible electrochemical reaction between two electrolyte solutions.
	www.energy.ca.gov /distgen/equipment/energy_storage/energy_storage.html (862 words)

	Battery Powered Flow Indicator and Totalizer
		The FPM-5750 Battery Operated Flow Indicator and Totalizer is compatible with the following flow sensors: FP-5300, FP-5100, FP-5200 and FP-6000 flow sensors.
		Screen displays can be modified to suit the user’s needs; along with the flow rate, any of the three totalizers can be selected as the displayed totalizer.
		A display averaging feature is included for applications where the flow in the pipe fluctuates.
	www.omega.com /pptst/FPM-5750.html (357 words)

	Recharging the power grid - MIT Technology Review - MSNBC.com
		And electricity distributors in California, Hawaii, and Denmark are eyeing Regenesys’s flow cell technology as a way to ease congestion and prepare their transmission networks for rapidly expanding flows of renewable energy.
		The flow cell is so named because instead of holding the electrolytes inside as does a conventional electrochemical battery, the technology pumps electrolytes from separate storage tanks, and they flow past either side of the film.
		The battery at Columbus Air Force Base and a sister facility Innogy is building next to a gas-fired power plant in Little Barford, England, represent the first large-scale construction of the technology.
	www.msnbc.msn.com /id/3078939 (2367 words)

	Lumur International, Inc.
		It assures pulsation-free flow is maintained within ±5% of the initial set point, even with varying back pressures from flow restrictions or buildup of material on the filter.
		The fault light indicator is activated when the pump attempts to operate outside ±5% of the required flow rate, such as from low battery, blocked tubing or filter, or other severe flow restriction.
		Also available is a multiflow low flow module, which maintains constant pressure and allows sampling with multiple sorbent tubes, each with an independently set flow rate.
	www.lumur.com /sampling_pumps.htm (2048 words)

	[No title]
		For example, to "recharge" a battery, we force the charge to reverse its direction of flow.
		For example, when a light bulb is plugged into the AC lines, the voltage and charge flow both reverse together, and so the energy does not vibrate back and forth.
		If we multiply the voltage across the battery by the current in the circuit, we get watts, and the polarity of the wattage shows us that electrical energy is flowing OUT of the battery and INTO the coil.
	www.amasci.com /miscon/voltrev.txt (567 words)

	http://www.batterygeek.net: External Laptop Battery, External Laptop Battery Pack, DVD Battery, Portable DVD Player ...
		The chemical reaction between the electrolyte and the positive (+) electrode inside the battery produces an excess of positive (+) ions (atoms that are missing electrons, thus with a net positive charge) at the positive (+) terminal - the cathode of the battery.
		When the battery is fully charged there is a surplus of electrons on the anode giving it a negative charge and a deficit on the cathode giving it a positive charge resulting in a potential difference across the cell.
		When the circuit is completed the surplus electrons flow in the external circuit from the negatively charged anode which loses all its charge to the positively charged cathode which accepts it, neutralising its positive charge.
	www.batterygeek.net /HowdoesBatteryWork.asp (973 words)

	Fairbanks Daily News-Miner » Archive » Flow battery scrutinized at UAF (Site not responding. Last check: 2007-10-07)
		On Wednesday, Johnson and his colleagues installed the new battery, known as a flow battery, in their lab on the UAF campus.
		That shouldn’t be a problem in the flow battery, since the energy is all stored in liquids.
		Batteries are used in alternative power systems to store excess energy when it’s available to be used later.
	newsminer.com /2006/08/06/1374 (678 words)

	EDN -- 03.01.96 Overload and reverse-current circuitry protects battery and load
		These criteria also apply to the use of an npn switch between the load and the battery return (Figure 2b) but with one major difference: Power npn transistors' much higher betas lower their base-current loss for a given load current.
		If your circuit's battery voltage is at least 10V, you can connect the gate of the PMOS FET directly to the battery return (Figure 5).
		On the other hand, if the load is light and you first correctly install the battery and then quickly reverse it, the output capacitor's charge holds the MOSFET on and allows reverse current to flow through the regulator.
	www.edn.com /archives/1996/030196/05df3.htm (2133 words)

	EPRI: Validated Test Data on MWh-Scale Flow and Other Battery Systems: Large Battery Installations 2003
		Because of the limited number of large-scale battery installations to date, this data was supplemented with information provided at the 2003 Electricity Storage Association conference and from other sources.
		This support is important because large-scale battery energy storage offers substantial promise to improve capacity factors and performance of electricity generation and distribution systems.
		Flow batteries are viewed as a leading technology option to provide MW-scale storage effectively and cost-efficiently.
	www.epri.com /OrderableitemDesc.asp?product_id=000000000001005019 (551 words)

	UAF Newsroom: Researcher to test new flow battery
		Once the flow battery is installed, Witmer plans to run tests for several years, evaluating its performance, durability and reliability in a lab, an unheated warehouse and outdoors.
		Traditional batteries, such as those found in automobiles, use solid lead plates in acid to store energy, he said, and can be expensive because they have a relatively short lifespan.
		In a traditional battery, he said, the chemical reaction between the lead and acid can cause degradation on the surface of the lead, which eventually shorts the battery and renders it useless.
	www.uaf.edu /news/a_news/20060728153420.html (716 words)

	Flow-Rite Controls (Site not responding. Last check: 2007-10-07)
		Water flows into each cell to the proper level and a flow indicator tells the operator when all the cells have been topped.
		Balls in the flow indicator rotate until the battery is full and then they stop.
		Flow-Rite Battery Watering Valves include flame arrestors to prevent spark ignition of flammable battery cell gasses.
	www.flow-rite.com /spw/pro-fill (464 words)

	International Research Center for Nuclear Materials Science
		We have proposed the uranium redox flow battery on the basis of the quite unique feature that the single element possesses two redox couples with identical structures (UO2+/UO22+, U3+/U4+).
		Since the energy efficiency of charge-discharge cycles depends on the reversibility of the battery reactions, the uranium battery is expected to be of higher charge-discharge performance at a large current density even compared with the existing vanadium redox flow battery.
		The battery is also effective to reuse the massive amount of depleted and recovered uranium.
	www.imr-oarai.jp /en/research/research4-5.html (403 words)

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