Battery cell and method for manufacturing battery cell

Abstract

Disclosed is a battery cell, which includes an electrode assembly, a pair of electrode leads electrically connected to the electrode assembly, a battery case configured to accommodate the electrode assembly and expose a portion of the pair of electrode leads to the outside, an electrolyte injection hole formed in the battery case and connectable to an electrolyte injecting device that injects an electrolyte in a vacuum state so that the electrolyte is injected into the battery case, and an injection hole cap configured to cover the electrolyte injection hole and mounted to the electrolyte injection hole so as to be detachable from the electrolyte injection hole by user manipulation.

What is claimed is: 
     
         1 . A battery cell, comprising:
 an electrode assembly;   a pair of electrode leads electrically connected to the electrode assembly;   a battery case configured to accommodate the electrode assembly and expose a portion of the pair of electrode leads to the outside;   an electrolyte injection hole formed in the battery case and connectable to an electrolyte injecting device that injects an electrolyte in a vacuum state so that the electrolyte is injected into the battery case; and   an injection hole cap configured to cover the electrolyte injection hole and mounted to the electrolyte injection hole so as to be detachable from the electrolyte injection hole by user manipulation.   
     
     
         2 . The battery cell according to  claim 1 ,
 wherein the injection hole cap is screwed to the electrolyte injection hole.   
     
     
         3 . The battery cell according to  claim 2 ,
 wherein the electrolyte injection hole has an inner hollow for injecting the electrolyte into the battery case and protrudes out of the battery case.   
     
     
         4 . The battery cell according to  claim 3 ,
 wherein the electrolyte injecting device is inserted into an outer circumference of the electrolyte injection hole when the electrolyte is injected in the vacuum state.   
     
     
         5 . The battery cell according to  claim 3 ,
 wherein an outer circumference of the electrolyte injection hole and an inner circumference of the injection hole cap respectively have threads for the screwing.   
     
     
         6 . The battery cell according to  claim 2 ,
 wherein the electrolyte injection hole has an inner hollow for injecting the electrolyte into the battery case and protrudes to the inside of the battery case.   
     
     
         7 . The battery cell according to  claim 6 ,
 wherein the electrolyte injecting device is inserted into an inner circumference of the electrolyte injection hole when the electrolyte is injected in the vacuum state.   
     
     
         8 . The battery cell according to  claim 6 ,
 wherein an inner circumference of the electrolyte injection hole and an outer circumference of the injection hole cap respectively have threads for the screwing.   
     
     
         9 . The battery cell according to  claim 2 ,
 wherein at least one anti-slip groove for preventing a slip during the user manipulation is formed at an outer circumference of the injection hole cap.   
     
     
         10 . The battery cell according to  claim 1 , wherein the electrolyte injecting device includes:
 an injection cylinder connected to the electrolyte injection hole;   a vacuum unit provided at the injection cylinder to decompress the inside of the battery case to a vacuum state; and   an electrolyte unit provided at the injection cylinder to provide an electrolyte into the battery case.   
     
     
         11 . A method for manufacturing a battery cell, comprising:
 separating an injection hole cap, which covers an electrolyte injection hole formed in a battery case of a battery cell, according to user manipulation;   connecting an electrolyte injecting device to the electrolyte injection hole;   decompressing the inside of the battery case to a vacuum state by using the electrolyte injecting device;   injecting an electrolyte into the battery case by using the electrolyte injecting device;   separating the electrolyte injecting device from the electrolyte injection hole; and   mounting the injection hole cap to the electrolyte injection hole according to user manipulation to cover the electrolyte injection hole.   
     
     
         12 . The method for manufacturing a battery cell according to  claim 11 ,
 wherein the injection hole cap is screwed to the electrolyte injection hole.   
     
     
         13 . The method for manufacturing a battery cell according to  claim 12 ,
 wherein the electrolyte injection hole has an inner hollow for injecting the electrolyte into the battery case and protrudes out of the battery case.   
     
     
         14 . The method for manufacturing a battery cell according to  claim 12 ,
 wherein the electrolyte injection hole has an inner hollow for injecting the electrolyte into the battery case and protrudes to the inside of the battery case.   
     
     
         15 . The method for manufacturing a battery cell according to  claim 11 ,
 wherein at least one anti-slip groove for preventing a slip during the user manipulation is formed at an outer circumference of the injection hole cap.