Air tightness detection system applied to new energy battery packs and detection method thereof

Abstract

The invention provides an air tightness detection system applied to new energy battery packs. The air tightness detection system comprises an air source FRL (air filter, pressure reducing valve and atomized lubricator), a pressure regulating valve, a pressure switch, a proportional valve, an electromagnetic valve, a vacuum generator, a one-way valve, a pressure sensor and a control device which are connected in sequence. The system is a precise battery pack air tightness detection system, and the precision reaches 0.01 Mpa. Precise control is conducted from an air source to guarantee the stability of the system, and imported precise components are selected to guarantee precise control over the air source. The precise proportional valve allows the pressure value to be directly set on a control system and also has the advantage of automatically adjusting the pressure of the air source. A small pressure sensor collects air pressure data in real time and sends the air pressure data to a software system, a visual 'T (time)-F (pressure)' analysis chart is formed in the saving process, the air tightness of each battery pack can be conveniently analyzed, and meanwhile the air tightness detection system has traceability.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to an air tightness detection system applied to a new energy battery pack and a detection method thereof. Background technique [0002] In the new energy battery pack, there is a waterproof protection level requirement. After the entire pack is assembled, the airtightness of the battery pack needs to be tested. The airtightness of the battery pack directly affects the safety of the car, and has very high requirements for the entire airtight detection system. [0003] At present, the air tightness test of the battery pack generally adopts the positive pressure method, and the air source air pressure is controlled through the triple piece and the solenoid valve, connected to the battery pack and the digital pressure switch, and judged by manually reading the air pressure value on the digital pressure switch Are there air leaks. This simple gas path mainly has the following defects: [000...

AI Technical Summary

Problems solved by technology

The air source has not been adjusted by a precision pressure regulating valve or a proportional valve, and the fluctuation of the air source may easily lead to unstable air pressure in the test;

[0005] 2. Air source adjustment is troublesome

The pressure of the gas source needs to be adjusted manually. If the gas source is unstable, it needs to be adjusted frequently, and it is not easy to monitor;

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