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Battery Storage and Cycle Life |
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A. Storage temperature and humidity (short-term)
Store batteries in a dry location with low humidity, no corrosive gases, and at a temperature range of -20°C to +45°C.
· Storing batteries in a location where humidity is extremely high or where temperatures fall below -2?°C or rise above +4?°C can lead to the rusting of metallic parts and battery leakage due to expansion or contraction in parts composed of organic materials.
B. Long-term storage (2 year, -20°C to +35°C)
Because long-term storage can accelerate vgp-bps2c battery self-discharge and lead to the deactivation of reactants, locations where the temperature ranges between +10°C and +30°C are suitable for long-term storage.
When charging for the first time after long-term storage, deactivation of reactants may lead to increased battery voltage and decreased battery capacity. Restore such batteries to original performance by repeating several cycles of charging and discharging.
When storing batteries for more than 1 year, charge at least once a year to prevent leakage and deterioration in performance due to self-discharging. When using a rapid voltage detection type vgp-bps2b battery charger carry out charge and discharge at least once every 6 months.
7.4. Service Life of Batteries
A. Cycle life
Batteries used under proper conditions of charging and discharging can be used 500 cycles or more. Significantly reduced service time in spite of proper charging means that the life of the vgp-bps2a battery has been exceeded. Also, at the end of service life, an unusual in-crease in internal resistance, or an internal short-circuit failure may occur. Chargers and charging circuits should therefore be designed to ensure safety in the event of heat generated upon battery failure at the end of service life. Please contact Firstar if you have any questions.
Because batteries are chemical products involving internal chemical reactions, performance deteriorates not only with use but also during prolonged storage. Normally, a battery will last 3 to 5 years if used under proper conditions and not overcharged or overdischarged. However, failure to satisfy conditions concerning charging, discharging, temperature and other factors during actual use can lead to shortened life (or cycle life) damage to products and deterioration in performance due to leakage and shortened service life.
7.5 Design of Products Which Use Batteries
A. Connecting batteries and products
Never solder a lead wire and other connecting materials directly to the VGP-BPS2A battery, as doing so will damage the battery's internal safety vent, separator, and other parts made of organic materials. To connect a battery to a product, spot-weld a tab made of nickel or nickel-plated steel to the battery's terminal strip, then solder a lead wire to the tab.
Perform soldering in as short a time as possible.
Use caution in applying pressure to the terminals in cases where the VGP-BPS2B battery pack can be separated from the equipment.
When rapid charging using the voltage detection method with a large current (1C or more), or when eaving the battery installed in the equipment, be sure to follow connecting the precaution listed above. Even for other uses, if connecting the precaution listed above is used as
much as possible, contact defects in the connection process can be reduced.
B. Material for terminals in products using the batteries
Because small amounts of alkaline electrolyte can leak out from the VGP-BPS2C battery seal during extended use or when the safety vent is activated during improper use, use a highly alkaline-resistant material for a product's contact terminals in order to avoid problems due to corrosion.
High Alkaline-resistant Metals Low Alkaline-resistant Metals Nickel stainless steel, nickel plated steel, etc Tin ,aluminum, zinc, cooper, brass. NOTE that stainless steel generally results in higher contact resistance.
C. Temperature related to the position of batteries in products
Excessively high temperatures (i.e. higher than 45°C) can cause alkaline electrolyte to leak out from the battery, thus damaging the product and shorten battery life by causing deterioration in the separator or other VGP-BPS2 battery parts. Install batteries far from heat-generating parts of product. The best battery position is a battery compartment that is composed of an alkaline-resistant material which isolates the batteries from the product's circuitry. This prevents damage caused by a slight leakage of alkaline electrolyte from the battery. Be careful particularly when trickle charging is carried out (for continuous charging).
D. Discharge end voltage
Overdischarge and reverse charge of the battery deteriorate battery characteristics. This can be caused by several actions, such as forgetting to
turn off the power. Installing an overdischarge cut off circuit is recommended in order to avoid overdischarge and reverse charge.
The discharge end voltage is determined by the formula given below.
Numbers of Batteries Arranged Serially
1 to 6 (Number of batteries ×1.0)V
7 to 20 ((Number of batteries-1)×1.2)V
E Overdischarge (deep discharge) prevention
Overdischarging (deep discharging) or reverse charging damages the VGP-BPL2 battery characteristics. In order to prevent damage associated with forget-ting to turn off the switch or leaving the battery in the equipment for extended periods, it is hoped that preventative options are incorporated in the equipment. At the same time, it is recommended that leakage current is minimized. Also, the battery should not be shipped inside the equipment.
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| 由ToYoTo发布于 2008-01-10 21:45:41 阅读(2) 评论(0) 类别[无] |
