Rechargeable battery to reduce internal resistance and method of manufacturing the same

A method for manufacturing a rechargeable battery, the method comprising the steps of:

• forming a plurality of battery jars including two adjacent battery jars connected to each other through a partition wall having a plurality of connection holes;
• preparing an electrode plate assembly including at least one cathode plate and at least one anode plate that are stacked together, the electrode plate assembly including two ends forming two leads respectively arranged in correspondence with the cathode plate and the anode plate;
• forming a plurality of power generation elements by joining each of two collector plates respectively including a plurality of connection projections integrally formed in each collector plate to a corresponding one of the two leads of the electrode plate assembly, wherein each of the two leads includes at least one cut-out portion corresponding to at least some of the plurality of connection projections;
• accommodating the power generation elements respectively in the plurality of battery jars;
• in one of the two adjacent battery jars, fitting the plurality of connection projections, which are arranged on one of the two collector plates located on a side of the power generation element adjacent to the other one of the two adjacent battery jars, into the plurality of connection holes of the partition wall;
• and
• welding and connecting the fitted plurality of connection projections to the plurality of connection projections, which are arranged on the collector plate located on a side of the power generation element adjacent to the one of the two adjacent battery jars in the other one of the two adjacent battery jars.