Lithium Secondary Battery Having Multi-Directional Lead-Tab Structure

Abstract

A lithium rechargeable battery, and more particularly, a lithium rechargeable battery having a multidirectional lead-tab structure is provided. The lithium rechargeable battery includes: an electrode assembly in which a separator and an electrode plate having a current collector, an active material, and a tab are alternately stacked; a lead electrically connected to the tab; and a battery case, wherein the lead is divided into a positive electrode lead and a negative electrode lead, and at least one positive electrode lead and at least one negative electrode lead are provided. The lithium rechargeable battery is appropriate for using a high current even while using a conventional lead-tab size.

What is claimed is: 
     
         1 . A lithium rechargeable battery comprising:
 an electrode assembly in which a separator and an electrode plate having a current collector, an active material, and a tab are alternately stacked;   a lead electrically connected to the tab; and   a battery case,   wherein the lead is divided into a positive electrode lead and a negative electrode lead, and at least two positive electrode leads and at least two negative electrode leads are provided.   
     
     
         2 . The lithium rechargeable battery of  claim 1 , wherein the electrode assembly is formed by alternately stacking electrode plates and separators so that tabs of electrode plates of the same polarity have different axial direction positions, and the leads are provided at positions corresponding to the tab positions. 
     
     
         3 . The lithium rechargeable battery of  claim 1 , wherein the electrode assembly is formed by alternately stacking electrode plates and separators so that tabs of electrode plates of different polarity have different axial direction positions, and the leads are provided at positions corresponding to the tab positions. 
     
     
         4 . The lithium rechargeable battery of  claim 1 , wherein the electrode assembly has a rectangular cross-sectional shape, and the positive electrode lead and the negative electrode lead are each selectively provided at four sides of the electrode assembly. 
     
     
         5 . The lithium rechargeable battery of  claim 4 , wherein the positive electrode lead and the negative electrode lead are formed in the same direction at one side of four sides of the electrode assembly formed in a rectangular cross-sectional shape. 
     
     
         6 . The lithium rechargeable battery of  claim 4 , wherein the positive electrode lead and the negative electrode lead are each dividedly formed at adjacent sides of four sides of the electrode assembly formed in a rectangular cross-sectional shape. 
     
     
         7 . The lithium rechargeable battery of  claim 4 , wherein the positive electrode lead and the negative electrode lead are each formed opposite to two opposing sides of four sides of the electrode assembly formed in a rectangular cross-sectional shape. 
     
     
         8 . The lithium rechargeable battery of  claim 1 , wherein the quantity of the positive electrode lead and the quantity of the negative electrode lead are equal. 
     
     
         9 . The lithium rechargeable battery of  claim 1 , wherein the quantity of the positive electrode lead and the quantity of the negative electrode lead are different. 
     
     
         10 . The lithium rechargeable battery of  claim 9 , wherein the quantity of the negative electrode lead is smaller than that of the positive electrode lead. 
     
     
         11 . The lithium rechargeable battery of  claim 1 , wherein a width of the positive electrode lead and the negative electrode lead is in a range of 1 to 10 cm. 
     
     
         12 . The lithium rechargeable battery of  claim 1 , wherein a thickness of the positive electrode lead and the negative electrode lead is in a range of 50 to 500 μm.