| CPC H01M 50/131 (2021.01) [H01M 10/0585 (2013.01); H01M 50/136 (2021.01)] | 3 Claims | 

| 
               1. A battery cell comprising: 
            an electrode laminate comprising positive and negative electrodes and an electrolyte layer, the positive and negative electrodes being alternately laminated with the electrolyte layer interposed between them; and 
                a tube-shaped insulating member that is heat-shrinkable and holds the electrode laminate, 
                wherein the insulating member has at least two folded parts for positioning a component disposed in an internal space of the insulating member, 
                the folded parts each have an internal folding angle of more than 0° and 90° or less, and 
                the folded parts each have a folding R formed on the folding part, when the insulating member has a thickness of t, each folding has a length of 0.2t≤R<2t. 
               |