As is known to all, blasting is an important cause of battery short circuit (i.e. use electrical appliances in the circuit in the battery, so that in a short period of time through the phenomenon of excessive current inside the battery), and both the battery short circuit and overcharge (another important cause of lithium ion battery blasting, namely the battery voltage is higher than the set limit). Can lead to the development of lithium ion battery internal in a short period of time accumulated a lot of heat and gas (lithium ion batteries work would generate gas), as a result, in order to release the pressure, lithium-ion batteries or inspire the internal pressure release device, either straight split its shell, and the two conditions will cause the battery internal material straight contact with air and then burned.
In general, the explosion and incineration of lithium ion batteries are rarely due to external circuit faults, which means that the vast majority of the explosion and incineration of lithium ion batteries are due to the planning defects inside the battery. For example, in the above mentioned SONY notebook battery blasting things, the electrolyte part of the problem battery is detected metal impurities, the incident is also due to metal impurities caused by unexpected conductive, formed an internal short circuit and induced blasting. Coincidentally, Boeing 787 aircraft lithium ion battery fire, and the aircraft battery in a special environment, the function of the electrolyte decreased significantly, and then induced internal short circuit.
Of course, these two cases of lithium ion battery blasting incineration things, are involved in the traditional lithium ion battery, and this Samsung GalaxyNote7 blasting things in the protagonist is lithium ion polymer battery, then lithium ion polymer battery in such things, and what is special? In fact, generally speaking, because the lithium ion polymer battery does not have a hard shell, the possibility of violent blasting and burning has been greatly reduced. When this kind of battery presents a blasting incident, it will explode early because of the poor impact resistance of the shell, and then it is generally shown as slow burning after blasting. However, the high variability in the shape of lithium-ion polymer batteries gives equipment manufacturers more freedom to plan and often requires additional planning for the battery pack. In this way, it is inevitable to present the battery pack planning does not pass, resulting in trouble. In the case of Samsung GalaxyNote7 explosion, it has been preliminarly confirmed that the battery pack with a major manufacturing defect is likely to be the chief culprit.
