The test result of differential pressure airtight detector is more accurate. First of all, it is necessary to make suitable fixtures to seal the battery according to the shape and material characteristics of the battery. According to the actual needs, positive pressure or negative pressure can be used for testing. After the workpiece end is inflated or pumped, the balance is still for a period of time. By comparing the pressure difference between the workpiece end and the standard end of the instrument, the air tightness of the battery is judged through a series of calculations. Specific parameters such as detection pressure and judgment limit need to be set according to user's requirements.
Shenyang Eltel has done many cases of battery air tightness testing. For example, test the air tightness of the new energy battery pack, because it has an air inlet and can be directly inflated without the assistance of other fixtures. However, due to the large internal volume of the bag, in order to shorten the inflation time and improve the detection efficiency, a bypass inflation system is specially equipped for assistance. Generally, the detection pressure is about 3-20kPa, the resolution is 0. 1Pa, and the pressure is 100s.