The core steps of battery pack air tightness testing focus on three key areas: equipment calibration, parameter setting, and pressure change monitoring.
1. Preparation
Equipment calibration: The air tightness tester must be calibrated in advance to ensure measurement accuracy.
Cleaning and fixture connection: Clean surface contaminants from the battery pack, match the test fixture according to size, and securely connect the instrument to the battery pack. For non-standard test fixtures, sealing adapters, or custom connection components used in this step, Hansheng Automation provides precision machining services based on customer specifications and required tolerances.
2. Parameter Setting
According to the battery pack design standards, key parameters such as test pressure, test time, inflation time, and pressure holding time are input. These directly affect the accuracy of the final judgment.
3. Inflation and Pressure Holding
After starting the instrument, the battery pack is inflated to the set pressure. The system then enters the pressure holding stage, maintaining stable pressure for tens of seconds to several minutes to eliminate interference from pressure fluctuations.
4. Leak Detection and Result Judgment
Leakage is determined by monitoring pressure changes after the holding stage. If the pressure drop exceeds the threshold, the battery pack is judged as unqualified; otherwise, it is qualified.
Qualified products: Marked and moved to the next process.
Unqualified products: Marked, leak points located, repaired, and then re-inspected.
