Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprising:

• an electrode body that has a structure in which a plurality of positive electrodes and negative electrodes are stacked via a separator;
• and
• a non-aqueous electrolyte, wherein:
• the plurality of positive electrodes includes a positive electrode that has a positive electrode mixture layer in which a mixture containing a positive electrode active material is formed and a positive electrode mixture layer non-forming portion in which the positive electrode mixture layer is not formed;
• the plurality of negative electrodes includes a negative electrode that has a negative electrode mixture layer in which a mixture containing a negative electrode active material is formed and a negative electrode mixture layer non-forming portion in which the negative electrode mixture layer is not formed;
• at least one of the positive electrode mixture layer non-forming portion and the negative electrode mixture layer non-forming portion has a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte;
• and
• a thermal capacity of the resin portion is 10 J/(kg·K) or more per unit weight of the positive electrode mixture layer or the negative electrode mixture layer.