Investigation on defects generation mechanism and method for reducing defects in impact extrusion of battery cases for vehicles

• Watanabe Tsubasa

  Graduate Student, Major in Mechanical Science, Graduate School of Fundamental Science and Engineering, Waseda University

• Motomura Mitsugu

  Department of Applied Mechanics and Aerospace Engineering, School of Fundamental Science and Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology, Waseda University

• Hagiwara Akio

  Nihon Aluminum Rolling Co., Ltd.

• Konishi Genta

  Nihon Aluminum Rolling Co., Ltd.

Bibliographic Information

Other Title

• 車載用バッテリーケースのインパクト加工における欠陥発生メカニズムとその改善
• シャサイヨウ バッテリーケース ノ インパクト カコウ ニ オケル ケッカン ハッセイ メカニズム ト ソノ カイゼン
• Investigation on defects generation mechanism and method for reducing defects in impact extrusion of battery for vehicles (in Japanese)

Abstract

The cases of the Li-ion batteries mouthed in EV (Electric Vehicles) and FCV (Fuel Cell Vehicles) are conventionally produced by multistage deep drawing. This forming process requires a large number of stages and is expensive. In this study, cold backward (impact extrusion) was adopted since it has very high productivity comparing to conventional process. However, the defects, such as cracks, distortion and uneven thickness will arise in produced cases. The generation mechanism and how to deal with those defects were investigated in this paper. From the experimental results, it was assumed that bending and twisting elastic deformation of dies are cause of the defects. It was found that the case of the deformation is in the heterogeneity state of the lubrication. The punch bottom geometry which can minimize the influence the heterogeneity of the lubrication in the last phase of forming was investigated. In order to reduce the wear of lubricant at high reduction of area, lubricant and surface treatment were also investigated.

Journal

• Journal of Japan Institute of Light Metals

  Journal of Japan Institute of Light Metals 62 (10), 363-369, 2012

  The Japan Institute of Light Metals

Keywords

• impact extrusion
• backward extrusion
• battery case
• 3003 aluminum alloy
• restunglar case

Details

• CRID: 1390001206340516608
• NII Article ID: 10031140875
• NII Book ID: AN00069773
• DOI: 10.2464/jilm.62.363
• COI: 1:CAS:528:DC%2BC3sXhsVegsrc%3D
• ISSN: 18808018
• ISSN: 04515994
• NDL BIB ID: 024026207
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024026207
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed