How does a dry cell battery work, can a dry cell battery be recharged? Dry cell batteries are primary batteries in the chemical power supply and are a kind of disposable batteries. Because the chemical reaction of discharging dry cell batteries is irreversible, they cannot be recharged. If it is charged with high current, it may catch fire and explode. If charged at low current, the battery will break, smoke, and leak liquid.
Can dry cell batteries be recharged?
Dry cell batteries are disposable batteries, that is, the common carbon batteries, alkaline batteries, the internal chemical reaction into electricity, irreversible, rechargeable, there are safety hazards, it may blow up, the manual also said that the general dry cell batteries are zinc - manganese dioxide system. This system is not rechargeable, should be discarded directly, direct charging will have the risk of explosion. In case of emergency charcoal can try to do this: perforate the battery, and then inject saturated sodium chloride brine into it, which can slightly extend the service life.
Dry batteries are not rechargeable, when we use up the power is not able to recharge the secondary use, because we commonly acid batteries when it is completely issued inside the energy can not be reduced reaction. If the battery is not rechargeable, then it must not be charged, otherwise the battery may explode and endanger personal safety.
The working principle of dry cell battery
Dry cell (Drycell) is a kind of paste electrolyte to produce direct current chemical batteries (wet cell is the use of liquid electrolyte chemical batteries), belongs to the primary battery, is a common use in daily life, as well as lightweight battery. It can be used in many electrical appliances by the homemade batteries in the laboratory. Most of the ordinary dry cell batteries are manganese and zinc batteries, the middle is a positive carbon rod, the outside is a mixture of graphite and manganese dioxide, and then outside is a layer of fiber network. The net is coated with a thick electrolyte paste, which is composed of ammonia chloride solution and starch, and a small amount of preservative.
The main working principle of dry cell is the redox reaction in the closed circuit, dry cell belongs to the chemical electrode power in the primary battery, is a one-time battery, it carbon rod for the positive, to the zinc cylinder as the negative, the chemical energy into electrical energy supply external circuit. In the chemical reaction, because zinc is more active than manganese, zinc loses electrons to be oxidized and manganese gets electrons to be reduced.
The discharge of dry cell is the electrolysis reaction of ammonia chloride and zinc, and the charge released is transmitted from graphite to carbon rod of positive electrode, the electrolysis reaction of zinc will release hydrogen gas, which will increase the internal resistance of the battery. The manganese dioxide mixed with graphite is used to absorb the hydrogen gas. However, if the battery works continuously or is used for too long, the manganese dioxide will not be able to absorb it anymore or it will be saturated. At this time, the battery will be too large because of the internal resistance and the output current is too small and lose its function. But at this time, if the battery is heated, or placed for a period of time, its internal aggregation of hydrogen gas will be released by heat or slowly released, manganese dioxide also to restore the recovery, then the battery will have vitality again!
Dry cell batteries are not only suitable for flashlights, semiconductor radios, recorders, cameras, electronic clocks, toys, etc., but also for national defense, scientific research, telecommunications, navigation, aviation, medicine and other areas of the national economy, very useful.
Dry cell batteries are good and bad to identify the method
1、Check the appearance
Excellent dry cell, the packaging will be marked trademark, manufacturer, battery type, nominal voltage, battery polarity, production date, shelf life, implementation of the standard number, and exquisite workmanship, neat and clean, no leakage. When buying, you can also check whether the goods are marked with the words "mercury-free", "0% mercury", "no mercury added".
2、Look at the logo
Alkaline dry cell batteries are marked with the word "ALKALINE" or "ALKALINE", while carbon dry cell batteries are marked with the word "carbon". Alkaline batteries are much higher than carbon batteries in terms of capacity, shelf life and reliability.
If dry batteries are not properly disposed of after use, they will cause irreparable pollution to the environment. Therefore, after the use of dry batteries, the batteries must be recycled, and can not be thrown anywhere.
3、Weighing
The same brand, the same specification of dry batteries, can be put on the electronic scale weighing, good quality batteries than the poor quality of the battery is much heavier. For example, alkaline batteries in the No. 5 battery generally weighs about 23 grams, No. 7 battery generally weighs about 11 grams. And No. 5 carbon battery weighs about 16 grams, hold in the hands of the alkaline battery is obviously heavier than the carbon battery.
4, look at the price
The high price of dry batteries, generally alkaline batteries, the quality is relatively better. Do not be greedy for cheap in the unlicensed vendors to buy batteries, these batteries not only short use time, there will be leakage, pollution of the environment hidden.
The above is the working principle of dry batteries, dry batteries are not rechargeable, we must pay attention to oh!
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