How to prevent fire accidents in the lithium battery industry

When it comes to the safety of lithium batteries, pure electric vehicles that have become more and more popular in recent years have made the safety of lithium batteries no longer limited to the "use" aspects of mobile phones, tablet computers, etc. Slowly highlighted. Whether it is still "use" or "line", the premise and core of the lithium battery industry to bring convenience to consumers are its safety. On July 6, a night of heavy rain in Nanjing City caused a lot of low-lying roads to accumulate water, resulting in water accumulation. Two electric buses in the water ignited spontaneously. It can be seen from the picture on the scene that at the time the water was flooded to the half of the bus wheel, the entire chassis of the vehicle was soaked in the water. According to industry analysis, the cause of the accident is likely to be caused by a short circuit in the battery pack and causing a fire.

It is understood that the international standards for the protection of electricians and electronic products have already established relevant standards, namely IP rating (IP is the abbreviation of IngressProtection). This degree of protection comes from the International Electrotechnical Commission's standard IEC60529 and consists of two numbers, the first number indicating dust and the second number indicating water resistance. The waterproof level is from the main, the larger the number, the higher the degree of protection.

Frequent fire accidents? How can the lithium battery industry be safe?

According to industry insiders, the waterproof battery must meet the IP67 rating. It is understood that the battery used in the Nanjing fire bus is only IP54, that is, the waterproof level is only 4, so after a night of immersion, Rainwater contacts the battery, causing an external short circuit in the battery, which in turn causes an internal short circuit, causing the battery to catch fire.

The author believes that if in the production process, enterprises have more strict control measures for battery waterproofing and adopt a higher level of waterproofing, perhaps this accident could have been avoided.

Coincidentally, on July 10, an aging workshop of Shenzhen Meibai Electronics Co., Ltd., a wholly-owned subsidiary of Ganfeng Lithium Industry, was involved in an accidental fire and explosion. The preliminary investigation revealed that the explosion of the explosion occurred as a semi-finished lithium battery of the aging workshop on the 4th floor of Meibai Electronics.

Frequent fire accidents? How can the lithium battery industry be safe?

It is understood that Meibai Electronics has just prepared to build a polymer lithium battery production line with a daily output of 600,000. Whether the battery that is on fire is a soft pack battery is still unknown. However, since this is not the first time that Meibai Electronics has had a fire and explosion accident (on March 22 this year, the company had a fire accident in a warehouse), so its safety precautions against lithium-fired fire accidents in the production process are in place. Still to be discussed.

The author believes that with the development of the new energy automobile industry, the connection between lithium-ion batteries and ordinary people is becoming more and closer, and the safety of lithium batteries is attracting more and more attention. Lithium-ion enterprises want to seize development opportunities and realize the development and growth of enterprises. They must not sacrifice sacrifices for "security" but should pay attention to security issues in all aspects. After all, security is the core of an industry's development. If you can't even talk about security, how should an industry develop?

Extended reading:

Is the polymer cell safer than the cylindrical cell?

Although it is not known whether the fire of the Meibai Electronics is a soft pack battery, the author interviewed Liu Yanlong, secretary general of the China Chemical and Physical Power Industry Association, on the issue of "polymer cores are safer than cylindrical batteries". Liu Yanlong said that the two batteries can't say who is safer than anyone else. The reason is that although the polymer battery core is not as hard as the 18650 battery case when the battery generates heat inside the gas, the gas is more likely to break through the interface of the soft case, which seems to be more than the cylindrical battery. It is not easy to explode violently, but the gas generated inside the battery comes from the flammable gas formed by the decomposition of the electrolyte. When a large amount of aggregates meets the open flame, it will also explode, and its destructiveness is not necessarily less than the destructiveness of the cylindrical cell explosion. It can also be seen that there is no luck in the safety of lithium batteries. As long as production is carried out, it is necessary to strictly control and control the safety hazards to a minimum point in order to create "safe" confidence in the hearts of consumers.

The page contains the contents of the machine translation.