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[Introduction]
Hydrogen ions and the synthesis of metallic nickel, electricity reserves, 30% more than the nickel-cadmium batteries, lighter than the Ni-Cd battery life is also longer, and the environmental pollution.
The nickel-metal hydride battery drawback is the price a lot more expensive than nickel-cadmium batteries, performance is worse than lithium.
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[Compared]
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The 1 view. The e rated voltage of each of the one unit cell, nickel metal hydride and nickel cadmium are 1.2V, while the lithium battery is 3.6V, the voltage of the lithium battery is three times that of the other two.
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The same type of battery weight lithium batteries and nickel-cadmium batteries is almost equal, and nickel-metal hydride batteries than lighter.
Shows that each battery weight is different, but the combination of individual cell Li-Po 3.6V high voltage, so that in the case of output the same voltage reduces the number of third leaving after forming the battery weight and size reduction.
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3.
The characteristic voltage = 1.2V energy / weight = 30-80 Wh / kg (watt hours / kg) and 108-880kJ/kg (kJ / kg)
Energy / volume = 140-300 Wh / L (watt hours / liter) that 504-1188kJ/kg (kJ / kg)
Self-discharge rate = average monthly 30%
The model of the low self-discharge, for 15-30% of the charge and discharge cycles per year = 500-1000 memory effect
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4 nickel-metal hydride batteries and nickel-cadmium batteries have the same memory effect. Therefore, regular discharge management is also required.
This periodic discharge management belongs to the fuzzy state, even some incorrect knowledge Discharge (each discharge used several times after discharge vary due to different company) this cumbersome discharge management can not be avoided in the use of nickel-metal hydride batteries.
Relative lithium batteries because there is no memory effect, very convenient and simple in use.
It is completely without regard to the number of residual voltage can be directly charged nature can shorten the charging time.
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[Used]
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When fast charging charger microcomputer to avoid battery overcharge.
Today's nickel-metal hydride batteries contain a catalyst, timely lifting of the dangers posed by the overcharge.
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Newly bought, or nickel-metal hydride battery is not used for a long time, take some time to reply "activate" the battery is.
Therefore, a number of new nickel-metal hydride batteries need to go through several charge - discharge cycles to reach their nominal power.
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[Discharge]
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1 in the use of the process of the battery, but also must be careful.
The battery for a few series together four AA batteries (such as digital cameras usually arranged), to avoid the battery is completely depleted energy, and then place the "reverse charge" (Reverse charging). This battery will produce irreversible damage.
However, normally these devices (such as the previously mentioned digital camera) capable of detecting the discharge voltage of the batteries in series, and when it drops to a certain extent, will automatically shut down to protect the battery.
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Single battery is not there will be more than dangerous, and will only continue to discharge until the voltage is 0. This will not cause damage to the battery, fact, periodic electrical is done and then full is conducive to maintaining the capacity and quality of the battery.
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The nickel-hydrogen battery has a higher self-discharge effect, about 30% or more a month. Than nickel-cadmium batteries self-discharge rate of 20% per month.
More full battery charge, the higher self-discharge rate;
When the power drops to a certain extent, the self-discharge rate will decline slightly.
The temperature of the battery stored at a very large impact on the rate of self-discharge. For this reason, the best for a long time without the nickel-metal hydride battery is charging up to 40% of the "half-full" state.
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4 effects of low self-discharge nickel-metal hydride battery in 2005, claimed that after a year can still save 70-85% electricity, and can be stored at a room temperature of 20 ℃ nickel-metal hydride battery charger for charging.
Some effects of low self-discharge nickel-metal hydride batteries better than alkaline batteries and lithium-ion battery discharge characteristics at low temperatures.
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[Maintenance]
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1. General, the new nickel-metal hydride batteries contain only a small amount of electricity you buy after the first charge and then use.
But if the battery factory a relatively short time, the power is enough, the recommended first use and then recharge.
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Buy a new nickel-metal hydride battery after 3-4 times the charge and the use of performance can play the best
Many of my friends first charging small problems encountered, for example, the first time the number of charging after filming did not imagine so. 3-4 times after charging and use have been solved.
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3. Nickel-metal hydride battery memory effect is small, still recommended we try each use and then charge, and is filled with one-time, do not charge for a will then charge.
This is the "longevity" point oh.
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4. Charging the battery, pay attention to the charger around the heat, too deliberately used what little fan blowing necessary, but it should be noted that the charger around not to put too much junk.
Ordinary users in the process of using the battery, the battery often do not have a dedicated storage bag;
Replacement battery will habitual battery readily put away, regardless amp is clean, damp place.
Such consequences is that the battery is easy to dirty contacts easy contact with metal, such as keys, easy to damp, and these are the enemy of batteries.
Recommendation: private placement point should be set to a battery and keep the battery clean.
In order to avoid the loss of power and other problems occur, keep the battery contact points at both ends and battery cover internal clean, if necessary, use a soft, clean, dry cloth graze.
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Long when not, remember to remove the battery from the battery compartment and placed in a dry environment into the battery compartment is recommended to avoid short-circuit the battery.
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Long-term do not have a nickel-metal hydride battery in the store a few months later, the battery naturally into a "sleep" state, the battery life is greatly reduced.
Nickel-metal hydride battery has placed a very long time, it is recommended that you use slow charge for charging is appropriate.
: According to the test, nickel-metal hydride batteries to save the best conditions to save about 80% charged.
This is because the nickel-metal hydride batteries self-discharge (month 10% -15% or so), if the battery is fully discharged and then save, not used for a long time, the battery self-discharge phenomenon will cause over-discharge of the battery, may damage the battery.
Think about to buy a new nickel-metal hydride rechargeable battery is not all there is electricity, which is the truth.
Recommendation: multi-comparison, to correct the wrong point of view, the maintenance of the battery to start from the right direction, otherwise it will backfire.
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7 of nickel hydrogen discharge.
Experts suggest that, try not to nickel-metal hydride battery discharge, over-discharge cause charging to fail, doing harm is far greater than the nickel-metal hydride battery memory effect!
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Multimeter self-test battery is full or not.
General nickel-metal hydride battery before charging voltage is below 1.2V, full voltage of about 1.4V. To judge, it is easy to determine the status of the battery.
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9. Charger into fast charge and slow charge.
Slow charging current is small, usually around 200mA, such as our common charging current is about 160mA.
Its long charging time, charging 1800mAh nickel-metal hydride batteries to about 16 hours. Although time is a bit slow, but the charge will charge it enough, and does not hurt the battery.
Fast-charge current is usually more than 400mA, the charging time is significantly reduced many ,3-4 hours you can get, also won the favorite.
Therefore, we often doubt, with a fast charge, why the price difference between the great do?
Good charger especially good fast charge with anti-overcharge protection feature, for example, our common the Panasonic Acura charger BQ390 performance in this regard particularly impressive, excellent chip software design capability to charge the battery, it is also fast charge battery damage to a minimum.
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10. Contradiction appears:
Slowly filling but not to hurt the battery charging time is too long;
Fast charge can save time, but harm to the battery, even now face the world best the Panasonic Acura charger BQ390 also reduce the degree of injury can only be good, but can not be completely avoided.
Contradiction can be resolved
Is to buy a fast charge and a slow charge.
Fast charge to charge for some time, for example after 5,10 times, switched to slow charging twice.
This again Battery performance is restored to the best condition.
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Are generally battery pack 11 battery is 4 or 6 series, and this time, it is important to maintain the balance of each cell, or because of a battery problem affecting the work of the entire battery pack.
(1) to ensure that the battery capacity, the best choice for the same model of the same brand at the same time buy battery.
(2) to maintain the battery charge within the battery pack in either full or empty. If there are more battery composed of several groups of batteries
Group, you can try the "Featured" look.
More specifically to say, the battery capacity, voltage and other parameters are similar monomer in series into a group of the battery pack, due to inadequate conditions, measured under normal circumstances put End point voltage and impulse voltage of a good electrical on it.
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12 for the long-term maintenance of the nickel-metal hydride battery, the use of low-frequency pulses - than the trickle charge current charging more to maintain good battery status.
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【Article is excerpted from: Baidu Encyclopedia】
【Network reprint / Just reference】
【Translation is by Goolge】
