2011年6月30日星期四
Sealed Lead Acid Battery – Worth to Choose
Perhaps the most common use for a sealed lead acid battery is for brownouts. That is extremely handy when you are inside your house and there is a sudden power failure of some sort. If you know how to properly set it up, a sealed lead acid battery is the most ideal power source for an emergency lighting during such emergencies. Very few people know that a sealed lead acid battery (a real big one) is used to power the electric motors of conventional (diesel-electric engines) and nuclear submarines.
What we ordinary mortals know is that sealed lead acid batteries are used to start the car or any motor vehicle for that matter. Sometimes known as SLA battery in automotive industry parlance, sealed lead acid battery is used for SLI or starting, lighting and igniting internal combustion engines or what we know as gasoline engines. You can imagine how useless a car becomes when there is no power in the SLA battery or you might even had experienced it one time or another while you are in a vehicle and it simply would not start. SLA batteries are also used for traction purposes (locomotion or propulsion) such as electric-powered light vehicles primarily those golf carts used going around the greens.
There are primarily two types of batteries in use today: the primary or non-rechargeable and the secondary or rechargeable battery. Of the two, it is the SLA rechargeable battery that is more common because of cost reasons. If you are using batteries frequently, it simply does not make dollar sense, to keep buying a new battery once it is fully discharged. So depending on the frequency and type of use, it is more practical to have an SLA rechargeable battery. The most common battery is the 12v sealed lead acid battery which is rechargeable. It is also the oldest type of battery which was invented in 1859.
A sealed lead acid battery is evaluated by a host of factors such as its energy-to-weight ratio (the second lowest in this category), the energy-to-volume ratio (also low in this regard) and power-to-weight ratio. However, a sealed lead acid battery can be redesigned or re-configured to suit a specific purpose. This is accomplished by changing the surge current depending on the type of usage. The car battery we usually know is a starting battery, meaning this sealed lead acid battery is for starting only to prevent any damage caused by a deep electrical discharge.
The advantages of using sealed them, especially if they have a lead-tin chemical base, are as follows:
* There is greater volumetric power generated by these batteries per unit weight.
* The cycle-lives of these batteries range between 200 and 300.
* The standby life of a sealed lead acid battery can go up to 15 years.
* These batteries deliver high stable voltage because of their low internal resistance. They also afford greater flexibility of operations because if there is a flat discharge, the discharge and recharge periods are very rapid.
* The temperature range in which these batteries can operate is substantial, ranging from -60 degrees Celsius to +80 degrees Celsius. Similarly, the atmospheric pressure range for operations is Vacuum to eight atmospheres.
* Added to their performance qualities, they are highly tolerant of shock and vibration because of their rugged external construction.
* These batteries are twice as environment-friendly as beer cans; aluminium soft drink cans, glass bottles, newspapers, and tires because nearly the entire battery lead is recycled.
Another type of a sealed lead acid battery is the deep-cycle battery that is fully and regularly discharged. This is very common in forklifts, golf carts and hybrid cars. The sealed lead acid battery is used in our offices without many people knowing about it – in the uninterruptible power supply devices in our personal or desktop computers. Most of them are the 12v sealed lead acid battery.
If you want to read more about sealed lead acid battery, please visit http://www.leoch.com
There are many batteries that you can choose from.
2011年6月28日星期二
2011年6月26日星期日
Unique Discussion about Leoch VRLA Battery
What is a VRLA battery? Leoch will tell you. VRLA battery is short for valve regulated lead acid battery. Leoch is the name of famous battery manufacturer in China. I wonder Leoch VRLA battery what’s the relations between them? The author will tell you in detail.
Valve regulated lead acid battery is a rechargeable battery just favor anybody other lead-acid battery. The inconsistency is the valve regulated lead acid battery does not water joined. Instead it is based on the sponged glass mat technology with calcium grids. The batteries offer a high rated performance and have an addition life expectancy. The technology used has enabled them to take operation to the demands and requirements of the mart. They have developed batteries like the drip cycle, which is a long life type of battery and to improving charging capabilities in mandate for the batteries to be charged in 1 to 2 hours.
Let us learn about the structure of VRLA battery from Leoch. The positive plates are basically plate electrodes, which is part of a grid frame of lead-tin-calcium alloy holding porous lead dioxide as the active agent. The negate plates are plate electrodes, which is chapter of a grid frame of lead-tin-calcium alloy holding spongy lead for the lively deputy. The Electrolyte is diluted sulfuric acid, which is used as a media for conducting ions in the electrochemical reaction in the battery. The separators are made from an advanced mini porous Absorbed Glass Mat. The separators prop electrolyte and prevent shoring among the affirmative and negative plates. Separators are made from non-woven linen of fine glass fibers, which is chemically settled in the electrolyte. Being porous, separators retain the electrolyte because the chemical reaction of the active agents in the plates.
The valve is a one-way valve made of matter such as neoprene. When gas is produced in the battery, the vent valve opens to unlock gas pressure. The vent protects the battery from exploding. When gas is produced is routinely occasioned at an abnormality such as, extreme overcharge conditions deserving to flawed charging Herve Leger Outlet, alternatively charger malfunctions. Because the rubber valve can be resealed Herve Leger Evening Dress, the valve can reopen repeatedly when it is needed. During normal use the valve of the battery is closed to shut out outdoor atmosphere and prevent oxygen in the atmosphere from reacting with the active material in the negative electrodes.
The Positive and Negative Terminals may be a nailed on tab type, which depends above the type of battery. Strong epoxy adhesives by with safe long adhesive-embedded routes safe the framework, which covers the finals. The power cell case is made from ABS resin Herve Leger 2011, unless otherwise specified.
Leoch AGM VRLA batteries indicate Valve Regulated Lead Acid Batteries with the following features: Maintenance-free, no water adding required; sealed valve-regulated, spill proof and leak proof; using unilateralism exhaust (safe vent valve) design on the battery cover, when the battery internal pressure have been up to the specifically value, the safe vent valve will open automatically, and will close after the pressure has been discharged, which can prevent the air to enter into battery.
If you want to know more about Leoch VRLA battery, please visit http://www.leoch.com
2011年6月24日星期五
Teach You to Use VRLA battery
The VRLA battery is generally used for stationary applications. Their capacities range from 30Ah to several thousand Ah and are found in larger UPS systems for power backup. Typical uses are mobile phone repeaters, cable distribution centers, Internet hubs and utilities, as well as power backup for banks, hospitals, airports and military installations.
Unlike the flooded lead acid battery, both the SLA and VRLA are designed with a low over voltage potential to prohibit the battery from reaching its gas-generating potential during charge. Excess charging would cause gassing and water depletion. Consequently, the SLA and VRLA can never be charged to their full potential.
Among modern rechargeable batteries, the lead acid battery family has the lowest energy density. For the purpose of analysis, we use the term ‘sealed lead acid’ to describe the lead acid batteries for portable use and ‘valve regulated lead acid’ for stationary applications. Because of our focus on portable batteries, we focus mainly on the SLA.
Here is some Applications of VRLA battery as following.
1. Easy to use
VRLA batteries only need to strictly control the charging voltage of rectifier. According to the different request of charging use and cycle use, it adopts regulation voltage to charge, and it doesn’t need any care when charging, and has no need to add distilled water, no need to inspect the voltage, proportion and temperature. But it needs to inspect the voltage and discharging capacity of batteries at regular intervals.
2. Simple to install
VRLA batteries have been recharged when they are produced so users don’t need to charge it when installing and using it at the first time. If it is stored for over six months, it can be charged in accordance with the produced rule. When you fully charge it, you do a capacity trial discharging test to judge whether the battery capacity meets its request standard and the quality is reliable.
3. Security and Reliability
VRLA batteries adopt sealing construction, with no acid mist, no pollution gas overflowing, which can be placed in upright or on side position. Due to the constant-voltage charging, the battery interior realizes the oxygen cycle process which has less water runaway. Although it is overcharged sometimes, the small quantity of gas can be exhausted through the security plugs so that the battery container with high pressure is not exploded.
4. Investment Saving
VRLA batteries don’t pollute the equipment and environment, which can be used along with electrical devices, so you don’t need a special room to place and maintain it, meaning less maintenance. Besides, you can use the folded battery rack to install it, which occupies a little space to save the investment cost of power source system.
In a word, VRLA battery is widely used in telecommunication, electrical power system, emergency lighting, automation control system, fire and security alarm system, solar energy, wind energy system, computer backup power source, portable instruments, medical system equipment, electrical power vehicles, electrical tools and so on.
If you want to know more about VRLA battery, you can visit Leoch International, which is a battery manufacturer of lead acid battery, whose site is http://www.leoch.com
2011年6月23日星期四
2011年6月22日星期三
Popularity of VRLA battery is on the rise
VRLA battery depends on security valve controls venting which is one-way venting, which don’t need any maintenance in use. For the recent years, because of its small volume, light weight, good sealing, no leakage, no pollution, good high rate discharges, maintenance free, and so on features, VRLA batteries are widely used by many professional department of electric power system.
The charge voltage setting on VRLA is generally lower than SLA. Heat is a killer of VRLA. Many stationary batteries are kept in shelters with no air conditioning. Every 8°C (15°F) rise in temperature cuts the battery life in half. A VRLA battery, which would last for 10 years at 25°C (77°F), will only be good for 5 years if operated at 33°C (95°F). Once damaged by heat, no remedy exists to improve capacity.
The cell voltages of a VRLA battery must be harmonized as close as possible. Applying an equalizing charge every 6 months brings all cells to similar voltage levels. This is done by increasing the cell voltage to 2.50V/cell for about 2 hours. During the service, the battery must be kept cool and careful observation is needed. Limit cell venting. Most VRLA vent at 0.3 Bar (5 psi). Not only does escaping hydrogen deplete the electrolyte, it is highly flammable.
Water permeation, or loss of electrolyte, is a concern with sealed lead acid batteries. Adding water may help to restore capacity but a long-term fix is uncertain. The battery becomes unreliable and requires high maintenance.
Here are some common features of VRLA battery as following.
1. High rate sealing: electrolyte like Gel is absorbed in the high porosity isolated plate, which is not able to flow, so it can be placed in upright.
2. No antimony lead alloy plate, less self-discharging.
3. Positive and negative plate is fully covered by the isolated plate, and effective materials are not able to fall off, and it has longer life span.
4. The volume of VRLA battery is smaller than the old-fashioned one, but its capacity is much higher.
5. No electrolyte is required in the transport way, meanwhile, it doesn’t produce acid mist, gas, with less maintenance when using.
6. Less internal resistance, good self-discharging with high current.
VRLA batteries don’t pollute the equipment and environment, which can be used along with electrical devices, so you don’t need a special room to place and maintain it, meaning less maintenance. Besides, you can use the folded battery rack to install it, which occupies a little space to save the investment cost of power source system.
In a word, VRLA batteries’ features create super advantage condition for telecommunication, electrical power, information, finance and so on modern science management. Because water filling and proportion testing is no required, and it only needs to inspect the change of voltage and capacity of charging and discharging. And it is able to realize the microprocessor control with no person watching. VRLA batteries are widely used in telecommunication, electrical power system, emergency lighting, automation control system, fire and security alarm system, solar energy, wind energy system, computer backup power source, portable instruments, medical system equipment, electrical power vehicles, electrical tools and so on.
If you want to know more about VRLA battery, you can visit LEOCH International, which is a professional battery manufacturer of lead acid battery. The site is http://www.leoch.com
2011年6月21日星期二
2011年6月16日星期四
2011年6月14日星期二
2011年6月13日星期一
Absorbed Glass Mat Batteries (AGM) is much better than GEL battery and flooded lead acid battery
AGM Batteries, one of VRLA battery, are comprised of lead plates, Advanced Glass Mat, and acid, inside the battery case. Each plate is wrapped in a separator to avoid short circuits, then a piece of glass matting is put on each side of the plate, then another plate is added, and the AGM matting is installed again. The plates, mats, and separators are installed into the battery by hand, soldered together, then flooded with acid. Nearly all AGM batteries are recombinant, meaning they can recombine 99% of the oxygen as well as hydrogen. There is nearly no water is loss.
The primary step is to understand the battery classification structure and where AGM batteries fit into it all VRLA batteries are the type of battery of which AGM batteries are a sub-class The VRLA battery is a category of minimal maintenance lead-acid rechargeable batteries, and its acronym stands for valve-regulated lead-acid battery Due to their construction, VRLA batteries don’t require water to be put into the cells on a regular basis The technology behind these batteries has been refined over time, as these specific types of batteries have been commercially available now for about a century
Besides, the charging voltages are the similar as for other lead-acid batteries. Even below severe from charge conditions, hydrogen emission is below the 4% such as for aircraft as well as enclosed spaces. The low self-discharge of 1-3% per month admits long time storage before recharging. The AGM costs 2 times that of the flooded version of the similar capacity. Because of durability, German high performance cars use AGM batteries in favor of the flooded type.
Advantages
• Inexpensive as well as simple to manufacture.
• Mature, reliable as well as well-understood technology – overce utilized correctly, lead-acid is durable as well as provides dependable service.
• The self-discharge is between the lowest of rechargeable battery cognitive systems.
• Capable of high discharge rates.
Limitations
• Low energy density – poor weight-to-energy ratio limits use to stationary as well as wheeled applications.
• Cannot be stored in a discharged condition – the cell voltage should never drop below 2.10V.
• Allows overly a limited number of complete discharge cycles – well suited as for standby applications that require overly occasional deep discharges.
• Lead content as well as electrolyte induce the Toshiba pa3594u-1brs battery environmentally unfriendly.
• Transportation restrictions over flooded lead acid – there are environmental concerns concerning spillage.
• Thermal runaway can occur whenever improperly charged.
Comparing to gel battery, AGM Battery will always beat a GEL battery for marine applications. AGM batteries are generally far more efficient than are flooded lead acid batteries. This is important when determining the cost to charge and discharge the batteries. Generally an AGM battery will give you between 80-90% of the power pushed into the battery, back. On the other hand, flooded lead acid batteries typically have efficiencies in the 40-60% range. The bottom lines here are time and money. Basically you spend more to charge a flooded battery than you do an AGM. This translates to money as generators eat gas, alternators rob horsepower from the engine, and battery chargers eat kilowatts. The real tragedy is that you get less of that power back from the flooded battery than you do with an AGM battery.
In simply terms, AGM Batteries are safer than GEL or Flooded Batteries - No Acid Leaks, no explosions. AGM Batteries are more efficient than either Flooded or GEL battery. AGM Batteries are able to be charged or discharged faster than Flooded Batteries (due to low internal resistance). AGM Batteries are the same voltage as their flooded cousins - allows for plug and play.
Source: www.leoch.com
2011年6月10日星期五
It turns out that GEL battery is still very useful in the market
Since no maintenance is required and valve regulated, Gel battery is classified as one type of VRLA battery. VRLA Gel battery is based on true gel technology which has more than half century experience. This type of batteries has gel electrolyte usually produced by the homogeneous distributed silicon dioxide in a diluted sulfuric acid named as gel SOL with thixotropic properties. The special designed vent valves are also used to control the gassing and water losing rate.
But why are they not widely used by people? There are four reasons in conclusion. First, the market share of almost zero; Second, most of the user response gel batteries in the summer heat and severe swelling caused by the battery "sudden death"; Third, gel batteries could cause an explosion, causing a fire; Fourth, the discharge poor performance, you may need to put power can not be large currents.
For those reasons, industry experts gave an analysis as following:
1. In theory, the volume of gel batteries with greater capacity, longer life, high and low temperature performance is better. However, domestic production of gel batteries, either prescription or gel plate perfusion, are not carried out by industry standards, resulting in low performance, short life and other issues.
2. Now made gel batteries for electric bicycle battery does not gel with foreign countries, as is made in the AGM separator, by vacuum infusion, the silicon filling cavities and sulfuric acid solution to the battery between the positive and negative plates.
3. Start-made gel battery fluid is rich with other VRLA batteries that are not the same. Early in the use of gel batteries; VRLA batteries can not be the oxygen cycle, it is because the positive and negative electrode gel were surrounded. Is the positive plate above the oxygen can not spread to generate negative plate, negative plate can not be achieved with the active material of lead reduction? Only by the exhaust valve in the discharge. Consistent with flooded batteries. Hence, early discharge is the acid to bring out the rubber, the particles easily adhere to the battery case, so, some users complained that the battery drain acid.
4. After a period of use gel batteries, gel began to dry and shrink, crack, crack oxygen through the oxygen directly to the negative plate cycle. Although the inhibition of the oxygen cycle water loss, excellent oxygen cycle also produces heat, so that the battery internal temperature, and even the formation of thermal runaway, resulting in cracks increased, the formation of abrupt termination of the internal fracture battery life.
5. Gel is much larger than the sulfuric acid resistance of conductive liquid, resulting in electric car battery voltage drop when high current start large motor starting torque decreased, the user can feel somewhat powerless.
6. According to ALABC (International Federation of lead-acid batteries) data show that the average life span of gel batteries are valve regulated sealed battery of 30%. This is the gel battery has good low temperature properties although it can not be the main reason for promoting the use of electric vehicles.
The conductivity of polymer colloids is weak, is generally not recommended for use as power batteries, in particular, often as a transport load of the electric car, we recommend the higher cost of electric vehicles first used lead-acid batteries, followed by a new generation of lithium-ion battery.
Gel battery, if as the ad says so well, why a large number of electric vehicle lead acid battery users chose it? Five years are proof that the lead acid battery is still the preferred means of transport of energy!
2011年6月9日星期四
2011年6月8日星期三
2011年6月7日星期二
2011年6月3日星期五
2011年6月1日星期三
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