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The first way to charge a lithium-ion battery during the process of charging a lithium-ion battery. The charging or discharging rate of lithium-ion batteries is usually expressed in terms of battery capacity. This ratio is called the C-ratio. The rate C is equal to the charge or discharge current under certain conditions. As a lithium-ion battery manufacturer tells you, there are many ways to charge a lithium-ion battery. So, how do I charge the lithium-ion battery correctly? How long should it take to charge a lithium-ion battery for the first time? see below.

Lithium-ion battery charging process

The most suitable charging process for lithium-ion batteries can be divided into four stages: maintenance charging, constant current charging, constant voltage charging and charging termination.

The first stage: maintenance charge-maintenance charge is used to pre-charge (refresh charge) fully discharged battery cells. When the lithium-ion battery voltage is lower than 3V, the battery is charged with a maximum constant current of 0.1C.

The second stage: constant current charging-when the battery voltage rises above the maintenance charging threshold, increase the charging current to constant current charging. The current for constant current charging is between 0.2°C and 1.0°C. The current during constant current charging may not be very accurate, and quasi-constant current is also acceptable. In the design of a linear charger, the current tends to increase with the increase of the battery voltage to minimize the heat dissipation problem of the energized crystal.

The third stage: constant voltage charging-when the voltage of the lithium-ion battery rises to 4.2V, the constant current charging ends and the constant voltage charging phase begins. To maximize performance, the voltage regulation tolerance should be better than +1%.

The fourth stage: charge termination-unlike nickel batteries, continuous charging of lithium-ion batteries is not recommended. Continuous charging will cause the effect of metal lithium plating on the film. This will make the battery unstable and may cause sudden automatic quick removal.

Li-ion battery charging method

● Parallel charging, as opposed to series charging, can prevent problems such as overcharging and dissatisfaction. Its disadvantages are high cost, low charging efficiency, and low reliability, so this charging method has not been widely used.

● The charger and the lithium-ion battery management system are charged in series. As the name implies, the charger and the battery management system need to be well coordinated to charge lithium-ion batteries in series, so as to prevent overcharging, especially the number of lithium-ion batteries. Solve problems such as low battery concentration.

● The normal charging method is the current method of charging lithium-ion batteries on the market. The important thing is that this method has low cost and simple structure. However, this method also has some problems. It is easy to overcharge, overcharging will cause the battery performance to decline, and may even cause explosions and fires.

Lithium-ion battery charging method is available for the first time

The lithium-ion battery does not need to be overcharged the first time it is used. Li-ion batteries have no memory effect, so do not charge them for the first time within 10-14 hours. The first few recharges of the battery are only for the battery capacity management of electrical equipment. In the future use process, it can also be charged and discharged without affecting the capacity.

Experiments have shown that ordinary batteries are protected by a protective circuit, even if they are charged for a long time, they will not cause an explosion and have no effect on the capacity of the battery. As for the unprotected battery, as the charging time increases, the temperature will get higher and higher, and it may explode when it exceeds 100°C.

The detailed first charging time of the lithium-ion battery can be determined according to the actual capacity of the battery. Many people charge lithium-ion batteries for 8 or 9 hours for the first time. In reality, such a long time is not necessary. Long-term use of lithium-ion batteries is not conducive to the durability of mobile phones.