Teach you "a few axes" to get the charger and discharge safety of mobile phone charger

Lithium-ion battery charging safety of mobile phones is increasingly valued by consumers. Therefore, charger manufacturers must master the specifications and characteristics of lithium-ion batteries when designing products, and use rechargeable chips with perfect battery detection and protection functions to reduce Danger due to conditions such as over current, over voltage or over temperature.

With the advancement of science and technology and the improvement of the quality of life, the traces of electronic products are everywhere, and mobile phones are an indispensable necessity in human life. Whether it is the early Black King Kong phone or today's powerful smart phone, you need a power supply to operate.

There are two main types of batteries in early mobile phones, one is nickel-metal hydride and nickel-cadmium batteries, and the other is lithium-ion batteries. However, it is very rare to use nickel-hydrogen and nickel-cadmium batteries as power sources. Most of them are very rare. Lithium-ion batteries are used. In particular, consumers hope that mobile phones will have longer standby time and smaller size, so nickel-metal hydride and nickel-cadmium batteries have been slowly eliminated due to consumer expectations. Although nickel-metal hydride and nickel-cadmium batteries are superior to lithium-ion batteries in terms of price and replacement of batteries, nickel-hydrogen and nickel-cadmium batteries can still be seen in other electronic products; however, in terms of volume, weight and capacity, Nickel-metal hydride and nickel-cadmium batteries are not as good as lithium-ion batteries, so today's light and short electronic products are advertised, almost all using lithium-ion batteries.

Because of its powerful functions and high power consumption on screens, smart phones require lithium-ion batteries that require large battery capacity and more durable power. When the battery of the mobile phone is low, the user usually charges the battery at any time with a charger or with a set of mobile power.

Volume/capacity combined with lithium-ion battery for electronic products

Rechargeable batteries can be divided into four categories according to their materials: lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries and lithium-ion batteries.

From the advantages and disadvantages of Table 1, nickel-cadmium, nickel-hydrogen and lithium-ion batteries are more suitable for use in electronic products; lithium-ion batteries are superior to nickel-cadmium in volume, weight and capacity (time of use of electronic products). Nickel-metal hydride batteries also have no memory effect, so lithium-ion batteries seem to be much more convenient for use in electronic products.

Extend the service life of lithium-ion battery charging/discharging voltage

In general, lithium-ion batteries have a limited range of electrical safety. Due to the characteristics of the lithium-ion battery, when the battery voltage rises to the highest set voltage during charging, the charging should be stopped immediately to avoid the danger of the battery being damaged due to over-charging; when the battery is powered (discharged), the battery voltage is reduced. Discharge should be stopped below the minimum set voltage to avoid reducing the service life due to overdischarge.

In addition, in order to ensure the safety of battery use, lithium-ion batteries must also be equipped with short-circuit protection to avoid danger; even if most lithium-ion batteries have protection circuits installed, choose a high-quality charger or mobile power supply. This is still an important consideration.

Lithium-ion battery charger is the first safety

A charger is a device that charges a battery to its rated voltage, and a lithium-ion battery charger must have the following features:

. Fixed current can be supplied to rechargeable battery

When the battery voltage reaches the maximum value and no longer rises, its charging current will start to drop. This will avoid overcharging the battery and causing battery damage. When the charging current drops to a certain level, the charger will stop charging.

. Make sure the battery has a usable voltage

After the battery is fully charged, if it is left for a long time, it will naturally discharge. To avoid excessive battery self-discharge, the battery voltage will drop. When the battery voltage is lower than the set voltage, the charger will restart charging the battery. To ensure that the battery can maintain a certain voltage while in use.