Lithium battery,Li-ion battery:
Lithium battery is a kind of battery with lithium metal or lithium alloy as positive / negative material and non-aqueous electrolyte solution. Lithium metal battery was first proposed and studied by Gilbert n. Lewis in 1912. In the 1970s, M. S. Whittingham proposed and began to study lithium-ion batteries. Because the chemical properties of lithium metal are very active, the processing, preservation and use of lithium metal have very high requirements for the environment. With the development of science and technology, lithium battery has become the mainstream.Rechargeable Lithium AA Batteries
Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium ion batteries do not contain metallic lithium and can be recharged. Lithium metal battery, the fifth generation of rechargeable battery, was born in 1996. Its safety, specific capacity, self discharge rate and performance price ratio are better than lithium-ion battery. Due to its own high-tech requirements, only a few countries' companies are producing this lithium metal battery.
Identify the battery:
Compare the battery capacity. The general cadmium nickel battery is 500mah or 600mah, and the hydrogen nickel battery is only 800-900mah; The capacity of lithium-ion mobile phone batteries is generally between 1300-1400mah, so the use time of lithium battery after full charge is about 1.5 times that of hydrogen nickel battery and about 3.0 times that of cadmium nickel battery. If you find that the working time of the lithium-ion mobile phone battery pack you purchased is not as long as advertised or specified in the manual, it may be counterfeit.
Look at the plastic surface and plastic material. The anti-wear surface of genuine battery is uniform, made of PC material, without embrittlement; Fake batteries have no anti-wear surface or are too rough. They are made of recycled materials, which are easy to crack.
Measure the charging voltage of the battery block. If cadmium nickel and hydrogen nickel battery blocks are used to fake lithium-ion mobile phone battery blocks, they must be composed of five single batteries. The charging voltage of a single battery generally does not exceed 1.55V, and the total voltage of the battery block does not exceed 7.75v. When the total charging voltage of the battery block is lower than 8.0V, it may be cadmium nickel and hydrogen nickel batteries.
For the original battery, its surface color and texture are clear, uniform, clean and free of obvious scratches and damage. The battery mark shall be printed with battery model, type, rated capacity, standard voltage, positive and negative pole mark and manufacturer name. The handle shall be smooth without obstruction, with appropriate tightness, good coordination with the hand and reliable latch. The hardware sheet shall be free of obvious scratch, blackening and greening. If the mobile phone battery we purchased does not conform to the above phenomenon, we can preliminarily conclude that it is a fake.
From their own point of view, many mobile phone manufacturers also strive to improve the process level to improve the difficulty of counterfeiting mobile phones and their accessories, so as to further curb the proliferation of fake parallel goods. Generally, regular mobile phone products and their accessories must be consistent in appearance. Therefore, if we install the mobile phone battery we bought back, we should carefully compare the body with the battery bottom shell. If the color is the same, it is the original battery. Otherwise, if the battery itself is dull, it may be a fake battery.
Observe the abnormal condition of charging. Generally, the genuine mobile phone battery should have an overcurrent protector inside. In case of excessive current caused by external short circuit, the circuit will be automatically cut off to avoid burning or damaging the mobile phone. The lithium-ion battery also has an overcurrent protection circuit. When non-standard electrical appliances are used and the AC current is too large, it will automatically cut off the power supply, resulting in failure to charge. Under normal conditions, the battery can automatically return to the on state. If, in the process of charging, we find that the battery is seriously hot, smoking or even exploding, it means that the battery must be fake.
With the help of special tools. Facing the increasing variety of mobile phone batteries in the market, and the counterfeit technology is becoming more and more sophisticated, some large companies are also constantly improving their anti-counterfeiting technology. With the improvement of anti-counterfeiting technology, it is difficult for us to identify the true and false from the appearance.
Selection method of lithium battery:
Lithium thionyl chloride battery pack connected in series
Lithium ion batteries are divided into liquid lithium ion batteries and polymer lithium ion batteries. The electrolyte of lithium-ion battery is flowing. Therefore, it is more unstable than lithium polymer battery. It may cause battery explosion in case of external force, or using a charger that does not meet the standard. Many mobile phones, laptops and other portable electronic products use lithium batteries. In other words, many people have a "bomb" around them. For the sake of safety, you must pay attention to the following points when shopping.
1、 Is the capacity clearly marked. Batteries without clearly marked capacity (such as 1000mah or 1000mA / h) are likely to use inferior batteries or recycled batteries. Many cheap batteries in the market are made of recycled battery cores. Although the price is cheap, the service life is short and the quality is unstable. Careless use may damage the mobile phone.
2、 There is no guarantee of standby time. Standby time refers to the continuous use time from the time the battery is loaded into the mobile phone to the next charging. Generally, the batteries sold in the market can not guarantee the standby time for customers, because the battery quality is unstable. Many cheap batteries use poor quality battery cores, so the standby time is very short.
3、 Whether safety protection circuit board is installed. Without a protective circuit board, the lithium battery is in danger of deformation, liquid leakage and explosion. Under the vicious price cutting competition, each family seeks a lower price to protect the circuit board, or omits the device at all, making the market full of lithium batteries with explosion risk. Consumers can't tell whether there is a protective circuit board from the appearance, so it's best to choose a reputable merchant to buy it.
Usage method:
Lithium batteries are durable goods and do not need to be equipped with expensive original seat batteries. Generally, ordinary seat batteries with brands can be used. The price is 15-20 yuan, eliminating the restriction that direct charging needs to rely on mobile phones. Seat charging can be divided into fast charging (about 2-3 hours) and slow charging (up and down for 10 hours). If there are many batteries, it is better to choose fast charging.
In addition, due to the characteristics of lithium battery, it is not necessary to discharge and overcharge. The life of the battery depends entirely on the effective charging time. In other words, even if you start charging in half, it has no effect on the battery life.
1. Cognitive memory effect
Battery memory effect refers to the reversible failure of battery, that is, the performance that can be recovered after battery failure. Memory effect means that the battery automatically maintains this specific tendency after a specific working cycle for a long time. This was first defined in Ni Cd battery. Ni CD bag battery has no memory effect, while sintered battery has memory effect Nickel metal hydrogen (commonly known as nickel hydrogen) batteries are not bound by this definition of memory effect.
Recommendation 1: it is unnecessary and harmful to discharge the battery before each charging, because the service life of the battery is unnecessarily shortened.
Recommendation 2: it is not advisable to use a resistor to connect the positive and negative poles of the battery for discharge. The current can not be controlled, which is easy to be put to 0V, and even lead to the reversal of the battery polarity of the series battery pack.
2. The battery needs to be activated
Before leaving the factory, the lithium-ion battery must go through the following process: the lithium-ion battery shell is filled with electrolyte - Sealed - formed, that is, constant voltage charging and then discharge. In this way, several cycles are carried out to make the electrode fully infiltrate the electrolyte and fully activate until the capacity meets the requirements. This is the activation process - Volume division. It is to test the capacity of batteries, select batteries with different performance (capacity) for classification, classify the battery level, and match the capacity In this way, the lithium-ion battery has been activated in the user's hand.
The time for the batteries delivered from the battery factory to reach the users is sometimes very long, ranging from one month to half a year. At this time, because the battery electrode materials will be passivated, the manufacturer recommends that the batteries used for the first time should be fully charged and discharged for 3-5 times, so as to eliminate the passivation of electrode materials and achieve the maximum capacity.
3. The first three times do not need to be charged for 12 hours
Early mobile phone NiMH batteries need replenishment and trickle charging process. It may take about 5 hours to reach the most perfect charging state, but it doesn't take 12 hours. The constant current and constant voltage charging characteristics of lithium-ion battery determine that its deep charging time does not need 12 hours.
4. Is the rechargeable battery at its best
Nickel based batteries have the best state, generally reaching their maximum capacity between 100-200 cycles. For liquid lithium-ion batteries, there is no such hump of cycle capacity. Lithium ion batteries are not at their best.
5. The greater the charging current, the faster the charging
For the charging of lithium-ion battery, increasing the constant current value of constant current and constant voltage charging mode within a certain current range (1.5c-0.5c) can not shorten the time of filling lithium-ion battery.
Fbelec's lithium battery manufacturers are exported to Europe, America, Australia, Japan, South Korea and Southeast Asia. They have professional services all over the world and have been recognized and praised by customers. They also have a large number of experienced industrial workers, who are professional and assured. The company is equipped with advanced manufacturing equipment, accurate testing instruments, full-automatic lithium battery assembly machine, full computer monitoring intelligent aging equipment, etc., and operates in strict accordance with ISO9001:2008 quality management system to ensure to provide customers with high-quality aluminum batteries
