Provided is an 
electrical energy storage device including an 
electrode winding body, which includes a positive 
electrode generating electrons by oxidation and reduction, a negative 
electrode for absorbing the generated electrons, and separation 
layers for physically separating the negative electrode from the positive electrode, which are sequentially wound around a winding core, and an 
electrolyte provided between the positive electrode and the negative electrode, the 
electrical energy storage device including: a terminal plate for externally connecting the electrode winding body to an external electrode connecting member such as an 
external resistor; a cylindrical can for accommodating the electrode winding body connected to the terminal plate; and a conductive interconnecting member for connection between the terminal plate and polarity-leads on one side of the electrode winding body by a method selected from the group consisting of 
plasma-spraying, 
welding, 
soldering and adhesion using a conductive 
adhesive material. According to the present invention, in which an interconnecting member for reducing a difference in thickness between objects to be welded is employed, it is possible to prevent 
welding failure between the polarity-leads of the electrode winding body and the terminal plate, thereby improving high-rate 
discharge (large current 
discharge) efficiency.