Lithium-ion battery leak testing

Inspecting the sealing performance of battery casings after closure and sealing

Overview

Target

Battery manufacturers

Background

To create safe and reliable secondary battery mass production systems with stringent quality standards, made necessary by the wider use of HEVs and EVs, we switched from different pressure air leak tester mechanism to the trace gas type, to perform leak testing with higher precision and reliability.

Application examples

Lithium-ion batteries for automotive use
[Image] Lithium-ion batteries for automotive use

The issue of low testing precision

The compressed air differential pressure type seals the same air pressure into the master workpiece and the target workpiece, and detects leakage from differences in amounts of change after a fixed time. That makes it susceptible to air temperature and other aspects of the external environment, and risks misdetection. Moreover, the detectable range of leak volume is narrow, and the system is not well suited to rapid testing of small leak volumes.

Challenge

The detectable leak volume range and precision of the compressed air differential pressure type are failing to satisfy quality standards, which have become more stringent in recent years.

Points

  • Inadequate testing precision
  • Strongly influenced by the products under testing and by the surrounding environment
  • Narrow detectable leak rate range

Conventional method

How the different pressure air leak tester mechanism
[Image] How the different pressure air leak tester mechanism

Solved with the trace gas system

Trace gas systems are highly reliable, and can perform high-precision leak testing in a short time, making them suitable for mass production facilities. An gas sensor directly detects gas that leaks from the pinhole, so results are not influenced by the external environment. The compact design of Yamaha’s system improves area productivity and allows easy layout changes.

Solution

Adopting the trace gas system makes it possible to create leak testing systems of high precision and reliability.

Points

  • Accurately detects slight leaks
  • Direct detection by high-sensitivity sensors
  • Wide detectable leak rate range

Solution

How the trace gas system works
[Image] How the trace gas system works

Solution that resolved this challenge

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