摘要：【中文】本发明涉及本发明涉及一种软包锂离子电池的极耳复合焊接方法，该极耳焊接方法包括：针对层叠后电芯，将铜箔和镍片进行焊接，铝箔和铝片进行焊接，首先使用超声波焊接机进行铜、铝箔预焊，预焊尺寸长*宽4mm*3mm；然后使用超声波焊接机进行极耳片焊接，焊接尺寸长*宽42mm*3mm；最后使用激光焊接机进行激光焊接，焊接形状条形，直径0.3mm，该极耳焊接方法首先进行极耳超声焊接，保证极耳的焊接强度；然后在超声波焊接的基础上增加激光焊接，有利于增强极耳焊接强度，防止焊接虚焊，提高极耳片和铜铝箔的导电性能，提高电芯的倍率性能，改善电芯充放电过程极耳温升过高现象，提升电芯循环寿命；本发明具有抗拉强度高、接触电阻低、极耳发热量低的优点。 【EN】The invention relates to a tab composite welding method of a soft package lithium ion battery, which comprises the following steps: welding copper foils and nickel sheets and welding aluminum foils and aluminum sheets aiming at the laminated battery cell, firstly, prewelding the copper and the aluminum foils by using an ultrasonic welding machine, wherein the prewelding size is 4mm in length and 3mm in width; then, an ultrasonic welding machine is used for welding the tab sheets, and the welding dimension is 42mm in length and 3mm in width; finally, laser welding is carried out by using a laser welding machine, the welding shape is strip-shaped, the diameter is 0.3mm, and the tab welding method firstly carries out ultrasonic welding on the tab to ensure the welding strength of the tab; then, laser welding is added on the basis of ultrasonic welding, so that the welding strength of the tab is enhanced, welding rosin joint is prevented, the conductivity of the tab and copper-aluminum foil is improved, the multiplying power performance of the battery cell is improved, the phenomenon of overhigh temperature rise of the tab in the charging and discharging processes of the battery cell is improved, and the cycle life of the battery cell is prolonged; the invention has the advantages of high tensile strength, low contact resistance and low heat productivity of the electrode lug.