Secondary battery and electronic device

A secondary battery comprising:

• an exterior body comprising a metal film, a first cushioning material, a second cushioning material and a third cushioning material;
• an electrode group comprising a positive electrode, a separator, and a negative electrode;
• and
• an electrolyte,
• wherein the first cushioning material is on a first periphery of the electrode group,
• wherein the second cushioning material is on a second periphery facing the first periphery of the electrode group,
• wherein the third cushioning material is on a third periphery of the electrode group,
• wherein each of the first cushioning material, the second cushioning material, and the third cushioning material is in a seal region of the exterior body,
• wherein an edge face of the first cushioning material is exposed at a side surface of the secondary battery,
• wherein the edge face of the first cushioning material faces a first direction,
• wherein the metal film extends beyond the edge face of the first cushioning material in the first direction,
• wherein an edge face of the second cushioning material is exposed at a second side surface of the secondary battery,
• wherein the edge face of the second cushioning material faces a second direction,
• wherein the metal film extends beyond the edge face of the second cushioning material in the second direction,
• wherein each of the elastic moduli of the first cushioning material and the second cushioning material is higher than the elastic modulus of the separator,
• wherein the electrode group is surrounded by the first cushioning material, the second cushioning material, and the third cushioning material,
• wherein the first cushioning material, the second cushioning material and the third cushioning material are in contact with the electrolyte, respectively, and
• wherein each of the first cushioning material, the second cushioning material, and the third cushioning material is provided to reduce a level difference between the seal region and a region where the electrode group is provided.

A secondary battery comprising:

• an exterior body comprising a metal film and a cushioning material;
• an electrode group comprising a positive electrode, a separator, and a negative electrode;
• and
• an electrolyte,
• wherein the cushioning material is on a periphery of the electrode group,
• wherein an edge face of the cushioning material is exposed at a side surface of the secondary battery,
• wherein the edge face faces a first direction,
• wherein the cushioning material comprises rubber,
• wherein the cushioning material is in a seal region of the exterior body,
• wherein the metal film extends beyond the edge face of the cushioning material in the first direction,
• wherein the electrode group is surrounded by the cushioning material,
• wherein the cushioning material is in contact with the electrolyte, and
• wherein the cushioning material is provided to reduce a level difference between the seal region and a region where the electrode group is provided.