According to media reports.On June 24, more than 20 people died in a fire at the AriCell of the China city lithium battery manufacturing plant in Gyeonggi Province, South Korea.

    AriCell Is a subsidiary of lithium battery company S-Connect, with a wide range of products, which is famous in South Korea. According to the Fire Disaster Headquarters in Gyeonggi Province, more than 35,000 lithium batteries were stored 。 A rapid lithium battery fire caused the fire.

The lithium battery fire warns us to pay attention to the safety protection of lithium battery. When the charge-discharge current is too large or the external short circuit, the internal heat may damage the battery or burn other parts, seriously shorten the cycle life of the battery; if the lithium ion battery works in a high temperature environment or in a load and high current, the lithium ion battery will also increase the risk of battery leakage, smoke, combustion and burst.

    Polymer thermistor (PPTC) products, in the high current density of lithium ion battery and its management circuit of overcurrent, overtemperature, short circuit protection, polymer thermistor is also called self-reset overload protector or self-reset fuse, a single element can complete the overcurrent, overtemperature, short circuit protection. It has played an irreplaceable role in the protection application of lithium-ion battery and its management circuits, and has now developed into a protection element that must be applied in lithium-ion battery and its management circuits.

    Lithium ion battery management and protection circuit usually consists of a primary protection circuit composed of dedicated integrated IC and metal oxide field effect tube. The protection IC controls the conduction or off of FET by monitoring the voltage and discharge current at the two ends of the battery to prevent overcharging, short circuit, overdischarge and other faults. Although primary protection is usually considered reliable, the protection IC or MOS-FET may be damaged when the electrostatic discharge voltage is too high or overwarm, and the integrated circuit will vibrate during short circuit. Meanwhile, most IC + MOS-FET circuits for charging and discharge overcurrent detection is indirect, and does not guarantee that overcurrent protection will be provided in all working states of the battery, and the reliability of protection is also reduced.

    Protection circuit access since the recovery fuse PPTC, even if a protection circuit failure or temperature rise is higher, PTC can still overcharge, overcurrent, short circuit, super temperature fault to provide timely protection, ensure the battery in misuse or abuse, or external reverse, short circuit, etc, no explosion, damage such as battery safety problems.