Thermal runaway is the primary cause of battery safety problems, so what causes lithium battery overheating?
First, the external components of the battery. If the temperature of the battery is too high and the battery does not discharge the heat properly, or the air inside is not good, resulting in poor heat dissipation of the battery. In addition, the company should pay attention to another condition, which is that the battery core is sometimes hot. The metal frame of the battery consists of copper and aluminium and has a good thermal conductivity. For circuits and components that have some high heat sources, it is important to ensure that they are kept in the battery compartment to dissipate the heat properly.
Again, something in the battery. One is a short cut. There are two types of micro-shorts.
One is a small circuit and battery production system, including burrs; the other is the use of the process in the short circuit, these conditions will lead to micro short circuit makes the battery area temperature higher than the thermal runaway temperature, causing the thermal runaway phenomenon.
The second reason is to charge the battery, which will reduce the running temperature of the device after it has run. When you use the latter, the battery power will decrease. At this point, the battery itself is already overcharged and the running temperature will drop; the third is the amount of electrolyte. If the number is large, the explosion will be very harmful, and the fire will be removed too much or even far, so the amount of electrolyte should be controlled.
Using the example of flex-pack batteries, lithium flex-pack batteries are another name for polymer batteries. Compared with cylindrical and square lithium batteries, they have the advantages of small size, light weight, high power, high safety and structural flexibility. The main difference between them is stainless steel or aluminium used for square and cylindrical batteries. Flexible pack batteries are made using compact manufacturing methods, so they are smaller in size and weight for the same density and weight the easiest. However, there are still many practical problems in the technological approach of flexible packaging batteries. First, the high cost and low technical level of aluminium-plastic film technology, especially in terms of lamination technology control, need additional ventilation.
Quality control issues will directly affect battery life and safety issues. Therefore, the manufacturers of flexible lithium batteries place great importance on internal research. The development of flexible packaging batteries has benefited from the on-going trend towards smaller, thinner and lighter consumer electronics. Small size means difficult to analyse.
