New Energy Electric Vehicles

A Comprehensive Guide to Power Battery Leak Testing: National Standard Updates, Testing Methods, and Selection Guidelines

This article focuses on the implementation of the new national standard GB 38031-2025 and systematically outlines the entire process of airtightness testing for power battery packs: It analyzes the fundamental differences between type testing and production line testing, compares the applicable scenarios for the four methods—direct pressure, differential pressure, flow-based, and helium leak testing—provides recommendations for selecting equipment for different components, and emphasizes that parameter settings must adhere to technical agreements. The paper also advocates for the objective evaluation of equipment through sample validation and repeatability testing, thereby offering a practical guide for production line acceptance.