Differential pressure hermetic tester is more accurate, first of all, according to the shape of the battery and the material characteristics of the production of suitable fixtures and fittings, the battery will be sealed, according to the actual needs of the positive or negative pressure can be used for testing. The workpiece end is inflated or pumped, balanced and static for a period of time, by comparing the workpiece end and the standard end of the instrument comes with, to read the pressure difference, and through a series of calculations, to judge the airtightness of the battery. The specific detection pressure, judgment limit and other parameters need to be set according to user requirements.
Shenyang Altech has done a lot of battery air tightness testing cases, as an example, such as the detection of new energy PACK battery pack air tightness, due to its own inflatable port, without the need for other fixtures to assist, directly to the internal inflatable, but due to the larger volume of the PACK content, in order to shorten the inflatable time to enhance the detection of the efficiency of the special equipped with a bypass inflatable system to assist, the general detection of the pressure of 3-20kPa or so, the resolution of 3-20kPa, the resolution of 3-20kPa or so. The general detection pressure is about 3-20kPa, resolution 0.1Pa, pressurized for 100s, the pressure drop is not less than 50Pa as qualified.