Unsafe factors of mobile power

The structure of the charger consists of a casing, a battery and a circuit board.

Customers are familiar with the charger shell, which is both beautiful and strong. Strength is reflected in strength and heat resistance. Under the unexpected impact, Mighty falls on the inside of the circuit board and the strong defense of the core. Its heat resistance is shown in the case of accidents such as spontaneous combustion inside the loading warehouse, which can play a certain flame retardant effect and reduce the damage caused by the accident. Roughly divided, the shell materials on the market are mainly two kinds of raw materials, plastic and metal. In contrast, metal casings have advantages in strength and heat resistance.

The battery is an important part of the charging library. Its raw materials directly affect the safety of mobile power supplies. A good battery can last longer and is relatively safe. Now, in the mainstream mobile power products, we first are the ordinary battery 18650 and polymer. From the outside, it is a 18650 cylinder, just like an extended version of No. Batteries and batteries are generally flat. In terms of material shape, 18650 uses liquid electrolyte, while polymer uses solid polymer electrolyte (either dry or glue).

indicates that the surface standard number 18650 is 18, indicating that the battery diameter is 18.0mm, and 650 indicates that the battery height is 65.0mm. There are usually three kinds of batteries, imported, domestic and second-hand. This time, batteries imported from Sanyo, Samsung and other large foreign manufacturers are of higher quality. The domestic 18650 lithium battery is the first battery produced by a domestic brand manufacturer, and the overall level must be separated from that of foreign countries. Used telecom, also known as mechatonic cells, refers to old products assembled from scratch in the past. These batteries are the culprit of many mobile power explosions and burners in recent years.

Due to the low cost of 18650 batteries, many mobile power manufacturers are using 18650 batteries, and some even choose inferior 18650 batteries to reduce prices and costs. The 18650 battery is made of liquid electrolyte. The mobile power supply of the 18650 battery causes the internal voltage to increase sharply when charging. If it encounters vibration and bumps, it is easy to cause electrolyte leakage, corrode the circuit board, and cause failure.

Polymer batteries usually mixed with lithium cobalt, lithium manganese and ternary lithium also have problems with leakage and short circuits. But it is safer than 18650. Suppose that a large-capacity mobile power supply, such as 8000mAh or more, is composed of multiple 18650 batteries in parallel. Once the explosion has serious consequences, the polymer battery will not explode and serious flames will occur.

The important function of the circuit board is to control the voltage and current in the process of input and output, as well as the terminal’s lighting, lightning protection and other functions. A good circuit board can increase the conversion rate, reduce the impact of charging resistance on charging, and make full use of the charging group. Excellent circuit design protects the battery, reduces loss and heat, and converts battery energy into output energy to the greatest extent, achieving stable use of voltage and stable flow. A good circuit board can automatically adjust when the power is overcharged or discharged, and automatically turn off the charging function after charging, which can protect the charging safety of mobile phones and other devices.