| 摘要 |
PURPOSE: A secondary battery is provided to absorb impacts on a connection part between a lead and a tab when external impacts are applied to the secondary battery, thereby preventing cracks and short circuit. CONSTITUTION: A secondary battery(20) comprises a cell assembly(220) in which at least two or more unit cells are laminated, wherein the unit cell comprises a positive electrode plate, a separator, and a negative electrode; electrode tabs(230) protruded from the positive electrode plate and negative electrode plate; and electrode leads(240) which are electrically connected to the positive electrode tab and negative electrode tab. The electrode lead has two or more uneven parts(260). The electrode tab is connected to the uneven part. The connection between the electrode lead and the electrode tab is conducted by resistance welding, ultrasonic welding, or conducting adhesive.
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