Battery safety difficult to 100% secure

Cause the battery temperature rise can be mainly divided into two categories: short-circuit and overcharge the battery.

The reason of battery short circuit is complexity, both may be the battery itself, its practical application is also a problem. Battery material contains metal impurities, Chiang Kai-shek negative aspects of the process of dislocation, uneven electrolyte are likely to cause a short circuit and the battery temperature eventually trigger thermal runaway.

In practice, the large current charging, low temperature charging, drop the collision, they are also likely to cause a short circuit.

Battery in the development cycle to go through the full experimental verification, the production process through strict monitoring and security monitoring to the factory. So the battery pack more pay attention to security monitoring, like LiFePO4 battery pack, it can be used in portale solar power generator. Even experimental verification full, it is difficult to simulate all of all of the actual usage. Passed the safety test can not guarantee safety of the battery, in other words, security is the chance of a problem. 

The Samsung Note7 phone due to battery failure caused massive recalls, in other areas, lithium-ion battery has been triggered by the recall or safety incidents.

2013 787 frequent fire incidents, triggering the public question. The investigation concluded that the final choice of 787 lithium-ion battery is defective, causing the battery to overheat and catch fire.

Earlier in 2006, the developer of Sony lithium-ion batteries have a global recall. Sony is the world's more than a 

dozen notebook computer battery production, due to the production process mixed with metal particles, causing 

the battery to short circuit fire.