Text（课文）

When the charging is in procedure，it is very important to decide when to terminate the charging.This is because of two main reasons.One is to avoid undercharge，i.e.，making sure the battery is fully charged，not partially，in order to use the full capacity of the batteries.The other one is to avoid overcharging which is very dangerous especially in the case of high energy density Lithium-based battery packs.If not terminated on time，the overcharging of batteries can lead to over gassing of the cells，especially in liquid electrolyte cells which results in increase in the volume of individual cells，a situation that cannot be tolerated in a rigidly packed battery pack.Another issue is overheating of the cells especially in Lithium-based batteries which can easily lead to the explosion and firing of the whole pack；Lithium is a very active material and easily combines with oxygen in the air.The only thing needed to begin the combination is enough heat.

Choosing different termination criteria leads to different termination methods.Selecting the type of termination of charging process depends on different factors such as the application and the environment where the battery is used.The conventional termination methods that can be used are mentioned here: