Date: 2024-01-17 hits: 229
PNAS has always adhered to the rigorous production process and inspection process, and has its own perfect battery testing equipment laboratory, which covers raw material testing, process testing, and finished product safety testing, including overcharge and overdischarge test, drop test, heavy impact test, extrusion test, low pressure test, combustion test, thermal shock test, short circuit test, and other tests. Layers of checks only to create a quality safety core.
Here are a few of the tests:
1, overcharge test: the lithium battery is fully charged, in accordance with 3C overcharge overcharge test, when the battery overcharge voltage rises to a certain voltage stable for a period of time, close to a certain time when the battery voltage rises rapidly, when rising to a certain limit, the battery cap is broken, the voltage falls to OV, the battery does not fire, explosion can be.
2, overdischarge test: discharge the battery to far below the rated voltage, and observe whether it produces overheating, smoke or other abnormal conditions.
3, Drop test: The packing box containing lithium ion batteries is dropped to the concrete floor from a height of 1.2 meters along three different coaxial faces and diagonal directions to see whether each package can withstand the drop test of 1.2 meters in any direction. The criteria for determination are: no damage to the battery or cell in the package, and no change in the position of the battery so that the battery contacts with each other, no leakage, no deflation, no disintegration, no rupture and no fire, no internal material leakage.
4, heavy impact test: fixed on the impact table, half sine pulse impact test. In the initial 3 seconds, the minimum average acceleration is 75g, the peak acceleration is 150±25g, and the pulse duration is 6±1ms. Three experiments were carried out in the axial and radial directions of the battery. The criterion is that the battery does not fire, does not explode, and does not leak.
5, extrusion test: the fully charged lithium-ion battery pack is placed on a plane, by the hydraulic cylinder applied with 13±1KN extrusion pressure, by the diameter of 32mm steel rod plane extrusion battery, once the extrusion pressure reaches the maximum stop extrusion, the battery does not fire, do not explode.
6, Acupuncture test: Place the fully charged battery on a plane and Pierce the battery radially with a 3mm diameter steel needle.
7, low pressure test: Put the test cell or battery into the battery low pressure test chamber, adjust the pressure in the box to equal to or lower than 11.6 kpa (simulated altitude 15240m), the cell or battery in the box storage for at least 6 hours. After the test, the sample should not ignite, explode or leak.
8, combustion test: In the test process, the lithium battery is placed under the hot wire, and gradually heated to a specific temperature and for a certain time. Observe whether the lithium battery burns or explodes.
9, thermal shock test: the battery is heated to a certain temperature at high temperature and maintained for a certain time, and then quickly cooled. During the test, the battery should not catch fire or explode before it is qualified.
10, Short circuit test: After the battery is fully charged, short circuit the positive and negative electrodes of the battery with a wire with a resistance of no more than 50m to test the surface temperature change of the battery. The maximum temperature of the battery surface is 140℃.
