Lithium battery safety performance test method

Lithium is the lightest non-gaseous in nature metallic substance, its intrinsic potential than any other metals are low compared with other types of batteries, lithium batteries, the ratio of capacity (capacity) of the unit weight and bulk density (unitvolume capacity) are the highest, have an unparalleled advantage.
In addition, the high internal resistance of the lithium battery, because of its internal electrolyte is a colloid aqueous solution instead. In addition, the very low moisture content, stable physical and chemical properties of the electrode material lithium battery can work safely in a wide temperature range. The individual lithium batteries can work in a low-temperature environment of -55 ℃ and 150 ℃ degrees Celsius temperature. Lithium battery rated output voltage of 2.7-3.6V

For lithium battery safety testing mainly the following aspects: the need by overcharge, short circuit, acupuncture, squeezing, heavy impact safety test, the battery no fire, no explosion to the following specific methods:
Overcharge
The lithium battery is fully charged, in accordance with the 3C overcharge overcharge test, the voltage rises to a certain voltage when the battery overcharge stable for a period of time, close to the time when the battery voltage fast rise up to a certain limit, the battery top-hat pull off, the voltage dropped to 0V, the battery did not fire, an explosion can be.

Short-circuit test
The battery is fully charged resistance is not greater than 50M wire to the battery positive and negative transient short-circuit, the test battery surface temperature, the maximum temperature of the surface of the battery to 140 ° C, the battery cap is opened, the battery is no fire, no explosion; acupuncture test: a fully charged battery on a flat surface, pierce the battery 3mm diameter needle in the radial direction. Test battery no fire, no explosion can; squeeze test: a fully charged battery on a flat surface, 13 +1 kN the extrusion pressure by the hydraulic cylinder giving a diameter of 32mm steel bar flat extrusion battery extrusion pressure reaches the stop squeezing, the battery does not fire, no explosion can be.

Heavy impact test
The battery is fully charged, placed on a flat surface, 15.8mm diameter vertical steel columns in the center of the cell, Weight 9.1kg weight fell from 610mm high degree of freedom to the steel column at the top of the battery, the battery does not fire, can not explode.