关键词: 动力电池；直冷板；气密检测；氦检技术

Abstract: This paper studies the conversion relationship between the liquid refrigerant leakage rate of the direct cooling plate of the power battery and the leak detection gas leakage rate. By studying the mechanism of the direct cooling plate leakage, a leakage conversion formula is proposed and compared with experimental data. The research results indicate that under the operating conditions of 2 MPa, 20 ℃, the helium detection value of the direct cooling plate is 1.504×10-5 Pa?m 3 /s according to the theoretical calculation formula proposed in this paper, the experimental leakage values are all in the order of 10-5 Pa?m 3 /s, which is very close to the theoretical calculation results, proving that this formula can effectively calculate the leakage rate of the direct cooling plate and can guide industrial applications.

Key words: Power battery; Direct cooling plate; Air tightness detection; Helium leak detection technique