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首页> 外文期刊>Journal of Manufacturing Processes >Tailoring micro resistance spot welding parameters for joining nickel tab to inner aluminium casing in a cylindrical lithium ion cell and its influence on the electrochemical performance
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Tailoring micro resistance spot welding parameters for joining nickel tab to inner aluminium casing in a cylindrical lithium ion cell and its influence on the electrochemical performance

机译：量身定制的用于在锂离子电池中将镍片连接到铝内壳的微电阻点焊参数及其对电化学性能的影响

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摘要

In an automotive battery, a large number of individual cells are electrically connected to meet the energy and power requirement. The choice of suitable welding techniques is critical in terms of mechanical strength and electrical contact resistance of the joint. Although soldering, ultrasonic welding and laser welding are the common joining techniques used in lithium-ion cell fabrication, application of resistance spot welding in the manufacturing of lithium-ion battery for electric vehicles is rather limited due to the difficulties in forming large weld nuggets and electrode sicking to the material. In this work, micro resistance spot welding of nickel anode tab to the one side open inner aluminium casing is carried out in an in-house fabricated cylindrical lithium-ion cell. The welding parameters for high electrical conducive nickel-to-aluminium are optimized using the Taguchi design of experiments. The weld joints are assessed by microstructural, mechanical properties and contact resistance characterization. The optimum weld joint shows a well-defined nugget with a shear strength of 338.4 MPa and the electrical contact resistance of 0.052 m Omega. The cell shows high current rate capability and 2 degrees C increase in the cell temperature at 2C rate. This work paves the way for the application of spot welding technique for tab welding in one side open casing for the manufacturing of lithium-ion cell.
机译：在汽车电池中，大量单个电池被电连接以满足能量和功率要求。就接头的机械强度和电接触电阻而言，选择合适的焊接技术至关重要。尽管焊接，超声波焊接和激光焊接是锂离子电池制造中常用的连接技术，但是由于难以形成大型熔核和熔焊，电阻点焊在电动汽车锂离子电池制造中的应用受到了很大的限制。电极使材料变脏。在这项工作中，在内部制造的圆柱形锂离子电池中，将镍阳极接线片微电阻点焊到一侧开口的铝内壳上。使用Taguchi设计的实验优化了高导电性镍铝合金的焊接参数。通过微观结构，机械性能和接触电阻表征来评估焊接接头。最佳焊接接头显示出明确的熔核，剪切强度为338.4 MPa，电接触电阻为0.052 mΩ。电池显示出较高的电流速率能力，并且以2C的速率将电池温度提高2摄氏度。这项工作为点焊技术在锂离子电池制造的一侧开口壳体中的凸焊的应用铺平了道路。

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