新能源汽車電池模組固定螺栓斷裂失效分析

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摘要：某新能源汽車電池模組固定使用的高強(qiáng)度螺栓在振動(dòng)試驗(yàn)過(guò)程中發(fā)生斷裂，通過(guò)理化檢驗(yàn)、裝配工藝和振動(dòng)測(cè)試情況多方面對(duì)螺栓斷裂失效原因進(jìn)行了調(diào)查分析。調(diào)查分析結(jié)果表明，螺栓裝配不當(dāng)形成疲勞源，在進(jìn)行Z向振動(dòng)時(shí)疲勞源在交變應(yīng)力和失效螺栓的上下結(jié)合面處螺栓受徑向剪切力的共同作用下不斷擴(kuò)展，最終導(dǎo)致斷裂。

關(guān)鍵詞：電池模組 螺栓 疲勞斷裂 裝配不當(dāng)

中圖分類號(hào)：TG113.22   文獻(xiàn)標(biāo)識(shí)碼：B   DOI： 10.19710/J.cnki.1003-8817.20230207

Fracture Failure Analysis of Battery Module Fixing Bolt for New Energy Vehicle

Cao Zhonghua1， Dong Lei1， Du Qingyuan1， Yan Zhongming2

（1. ZEEKR Intelligent Technology Co.， Ltd.， Ningbo 315336; 2. Jiashan Huiyuan Precision Machinery Co.， Ltd.， Jiaxing 314112）

Abstract： The fracture of a high-strength bolt used for fixing battery module of a new energy vehicle in the process of vibration test was investigated and analyzed through physical and chemical inspection， assembly process and vibration test. The results of investigation and analysis show that the cause of fracture is the formation of fatigue source caused by improper bolt assembly， the fatigue source continues to expand under the combined action of alternating stress and radial shear force at the upper and lower joint plane of the failed bolt along Z-direction vibration， which eventually leads to fracture.

Key words： Battery module， Bolt， Fatigue fracture， Improper assembly

1 前言

在振動(dòng)激勵(lì)條件下，受外界循環(huán)剪切載荷作用螺栓連接狀態(tài)會(huì)發(fā)生變化，不僅會(huì)影響結(jié)構(gòu)的正常功能，甚至?xí)斐蓢?yán)重后果。（剩余6372字）