Lithium battery charging and discharging time

Introduction The number of charging and discharging times of lithium batteries ranges from 300 to 3,000 times. Lithium battery is a type of battery that uses lithium metal or lithium alloy as positive/negative electrode materials and uses non-aqueous electrolyte solut

Lithium battery charging and discharging time

Variation of 300 to 3,000 times. Lithium battery is a type of battery that uses lithium metal or lithium alloy as positive/negative electrode materials and uses non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, M.S Whittingham proposed and began studying lithium-ion batteries. Since the chemical properties of lithium metal are very active, the processing, storage and use of lithium metal are subject to very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream. Generally, the life of lithium batteries is 300 to 500 times, and the number of charging and discharging times of lithium batteries based on different materials varies from 300 to 3,000 times. According to the specified charge and discharge rateby the manufacturer (for example, charge and discharge 0.5C, charge from 0% to 100% each time and repeat this cycle), after 500 cycles, the battery capacity will remain at the original 80%. %. The number of charges that can be used is more related to usage habits.

The lifespan of a lithium battery is "500 times", 500 times of charge and discharge. If it exceeds this number, the battery will be "at the end of its life".

The lifespan of a lithium battery is “500 times”, which does not refer to the number of charges, but to one cycle of charging and discharging.

A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge. For example, a lithium battery only uses half its power the first day and then charges slowly. If it's still the same the next day, that is, if you charge it half wayIf you charge it twice in total, this can only be counted as one charging cycle and not two.

Therefore, multiple charges may typically be required to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reduction in power is very small. High quality batteries retain 80% of their original capacity after being charged several times. Many lithium-ion powered products are still in use after two or three years. Of course, lithium batteries still need to be replaced once their lifespan is reached.

How to identify?

1. Compare battery capacity.

General nickel-cadmium batteries have a capacity of 500 mAh or 600 mAh, and nickel-hydrogen batteries are only 800-900 mAh; while the capacity of lithium-ion batteries for cell phones is generallybetween 1,300 and 1,400 mAh, lithium batteries are therefore used. once they are fully charged, the time is about 1.5 times that of nickel-hydrogen batteries and about 3.0 times that of nickel-cadmium batteries. If you find that the lithium-ion cell phone battery you purchased does not work as long as advertised or specified in the manual, it may be counterfeit.

2. Look at the plastic surface and the plastic material.

The original battery has a uniform wear-resistant surface and is made of PC material, which is not brittle. Counterfeit batteries do not have a wear-resistant surface or are too rough and are made from recycled materials. are prone to fragility.

3. Measure the charging voltage of the battery pack.

If a nickel-cadmium or nickel-hydrogen battery pack is used to counterfeit a lithium battery packm-ion for cell phone, it should be made of 5 single cells.The charging voltage of the battery generally does not exceed 1.55V, and the total voltage of the battery pack does not exceed 7.75V. When the voltage total charge of the battery pack is less than 8.0 V, it may be nickel-cadmium or nickel. hydrogen battery.

4. For original batteries, the color and texture of the battery surface should be clear, uniform, clean, without obvious scratches or damage; the battery brand must be printed with the model, type and rated capacity of the battery. , standard voltage and normal voltage. Negative pole mark, manufacturer name.

It must be smooth and unobstructed, have a suitable seal, fit the hand well and have reliable locking; the material must not have obvious scratches or black or green spots. If the battery of the cell phone we buy is notnot consistent with the above phenomenon, we can initially conclude that it is a fake.

5. From their own perspective, many mobile phone manufacturers have made efforts to improve their know-how to make mobile phones and accessories more difficult to counterfeit, thereby further curbing the proliferation of counterfeiting and parallel imports.

As a general rule, classic mobile phone products and their accessories should have a consistent appearance. Therefore, when we install the battery of the mobile phone we purchased, should we carefully compare the body and the bottom case of the battery? If the color matches, it is an original battery. Otherwise, the battery itself is dull and dull, and it may be a fake battery.

6. Observe charging anomalies. Generally, genuine cell phone batteries doihave an overcurrent protector inside, which automatically cuts off the circuit when an external short circuit causes excessive current to avoid burning or damaging the phone. Lithium-ion batteries also have an overcurrent protection circuit, which can be; used when non-standard electrical appliances are used, when the power supply current is too large, the power supply will be automatically cut off, resulting in charging failure under normal conditions of the battery, it can automatically return to the conductive state. If during the charging process we find that the battery seriously overheats, smokes or even explodes, it means that the battery must be fake.

Reference materials:

Lithium battery from Baidu Encyclopedia

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