Lithium batteries "safe" is always an important issue of troubled lithium battery industry. In recent years, exposure of battery explosion without exception are caused by the use of lithium batteries, talking about causes of the explosion, compared with other types of batteries, This is due to the special nature of the lithium battery materials and technology decisions. To do this, you should understand the knowledge of lithium battery exploding, we try to be explained in the following three aspects.
First, what is the battery explode?
Stipulated by national standard, the moment of solid material ejected within any part of the battery was pushed to the lithium batteries over a distance of 25cm,called the explosion. Experiments found is: a circular mesh covering the experimental battery and place battery in the center position, that is, from the guards on either side of 25cm, if the without solid part passed the grilles, then battery unexploded. Here on the "net" specific to show: cable with a diameter of 0.25mm soft aluminum, density network of 6 to 7 / cm.
Second, how to prevent the lithium battery explode?
All lithium battery explosions are caused by a short circuit which caused by the fever, and caused by a short circuit due to another reasons like overcharge, over discharge, positive and negative direct docking, electrolyte leakage. Therefore, in the lithium battery design, you can start from the following:
1, prohibits overcharging to 4.2V or more;
2, prohibit over discharging 2.75V or less;
3, installed explosion-proof valve on a metal shell;
4, short-circuit proof on the process.
Of course, Design process Lithium battery need to have a design for battery protection circuit board. Although this will increase the production cost of lithium batteries, it is necessary for safety to use lithium batteries, all the normal lithium battery manufacturer's products are inevitably this design.
Third, polymer lithium batteries will explode it?
Lithium polymer battery is the use of flexible packaging and polymer electrolyte made of a lithium battery products, under normal usage circumstances, storage will not explode unless damage caused artificially strong short-circuited.
To reduce the explosion happened, lithium polymer is used by more and more occasions, although lithium batteries replace other types batteries are still alternatives, in the type of lithium battery, the lithium-polymer battery has already begun to replace ordinary lithium batteries in some field.
