Secondary battery

A secondary battery comprising:

• an outer container with a lid;
• an electrode body including an electrode group with a positive electrode plate and a negative electrode plate, a positive electrode current collecting tab group with a plurality of positive electrode current collecting tabs extending from the electrode group, and a negative electrode current collecting tab group with a plurality of negative electrode current collecting tabs extending from the electrode group, the electrode body stored in the outer container;
• a pair of output terminals on the lid;
• a positive electrode lead having a first joint portion connected to one of the output terminals and a second joint portion connected to the positive electrode current collecting tab group, the positive electrode lead electrically connecting the positive electrode current collecting tab group to the output terminals;
• and
• a negative electrode lead having a first joint portion connected to the other output terminal and a second joint portion connected to the negative electrode current collecting tab group, the negative electrode lead electrically connecting the negative electrode current collecting tab group to the output terminal, wherein
• the second joint portion has a first joint surface and a second joint surface opposing each other, and a part of current collector tab groups of the same polarity is joined to the first joint surface, and another part of the group of current collector tabs of the same polarity is joined to the second joint surface and opposing the part of the current collector tab groups across the second joint portion.