Briefly describe the conditions of large-capacity polymer battery explosion and the protection method of battery

著者：Iflowpower – Portable Power Station ပေးသွင်းသူ

The explosive conditions of the explosion conditions of the polymer battery and the protection method of the battery have a large-capacity polymer battery exploded or combustion due to strong chemical reactions inside the battery, and there is a large amount of heat and gas. In order to promote the strong chemical response of the battery, some necessary external conditions must be met: 1. The battery is seriously overchaled, the chemical system of the lithium-ion battery determines that when the battery is overchaired, LiCoO2 in the battery becomes a CO3O4, and CO3O4 is a strong The oxidant can be reacted with an electrolyte, and the gas (O2) can be attacked.

Oxygen continues to react with electrolyte water (H2O), water can continue to react with lithium, electrolyte…Therefore, the internal heat of the battery will attack a lot of gases, and the response will follow the voltage rise, rise, in general, more than 4.2V battery voltage attack, there is such a reaction, when the reaches of 5V, the battery voltage and the battery internal temperature and gas pressure New, most batteries will burn, because internal short circuit attacks (polymer battery) or blasting rigid package (liquid). The specific response process is as follows: 2.

The battery is heated by high temperature. When the battery is heated by high temperature, the electrolyte evaporates decomposition. The internal pressure of the battery increases, the isolation membrane inside the battery may melt, resulting in short circuit inside the battery and incinerates.

The higher the battery voltage, the shorter the high temperature resistance. The picture below shows the coke thermal characteristic curve of different data: 3. The battery is short.

When the battery is fully charged, it suddenly shorts. 1) External short-circuit battery, liquid rigid package battery, because the temperature rise of the battery, internal electrolyte decomposition and evaporation, may cause the internal pressure of the battery too much, and now blast, and some battery due to various reasons, the initial internal pressure has always been Large, short circuit, battery, or blast under high temperature. Soft packing battery, except for short circuit, will bulle, or crack.

No burning. 2) short circuit in the battery. When the battery is charged, due to various reasons, the temperature will rise sharply when the positive electrode and negative electrode inside the battery are short, which will cause serious reactions in the battery inside.

In this case, the core of the hard shell bag will explode, while the core of the polymer flexible package will combustion. Solved the above aspects, now there is an important maintenance board, PTC, special charger, and fuses, etc. Maintaining the Board of Directors, discharging batteries and overcurrent levels, PTC is a large short-circuit current, the battery overheating current secondary maintenance battery, charger is constrained battery charging current and voltage, and with a small fuse, now it is now The use is completely completely intercepted by battery voltage or current, ensuring that the battery will not be used again, ensuring that the battery will not have serious accidents.

Therefore, the reliability of these maintenance equipment directly affects the safety application of the battery, should attract satisfaction. .