{
  "$type": "site.standard.document",
  "description": "A secondary battery includes outer package members each having flexibility and a battery device. The outer package members each include a thermal-fusion-bonding layer. The battery device is contained in an inside of the outer package members, and includes a positive electrode, a negative electrode…",
  "path": "/patents/1342514",
  "publishedAt": "2023-04-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M50/129",
    "MURATA MANUFACTURING CO., LTD."
  ],
  "textContent": "A secondary battery includes outer package members each having flexibility and a battery device. The outer package members each include a thermal-fusion-bonding layer. The battery device is contained in an inside of the outer package members, and includes a positive electrode, a negative electrode, and an electrolytic solution. The outer package members are sealed at a thermal-fusion-bonding part. The thermal-fusion-bonding part is formed by the thermal-fusion-bonding layers being thermal-fusion-bonded to each other. The thermal-fusion-bonding layer includes polypropylene. The electrolytic solution includes a solvent and an electrolyte salt. The solvent includes a chain carboxylic acid ester. The thermal-fusion-bonding layer has a thickness of greater than or equal to 25 μm and less than or equal to 60 μm. The thermal-fusion-bonding part has a length of greater than or equal to 160 mm and less than or equal to 650 mm. The thermal-fusion-bonding part has a width of greater than or equal to 3 mm and less than or equal to 6 mm. A dimensional ratio defined by the thickness of the thermal-fusion-bonding layer, the length of the thermal-fusion-bonding part, and the width of the thermal-fusion-bonding part satisfies a condition represented by Expression (1). A drawn amount of the outer package members is less than or equal to 7.8 mm. A content of the chain carboxylic acid ester in the solvent is greater than or equal to 30 vol % and less than or equal to 60 vol %. ≤()/ () Where: (T×L)/W is the dimensional ratio; T is the thickness (cm) of the thermal-fusion-bonding layer; L is the length (cm) of the thermal-fusion-bonding part; and W is the width (cm) of the thermal-fusion-bonding part.",
  "title": "SECONDARY BATTERY"
}