{
  "$type": "site.standard.document",
  "description": "The present disclosure relates to a lithium ion secondary battery, which can prevent a cylindrical can from being cracked due to an external shock applied during an assembling process while controlling a rupture pressure of the cylindrical can. The cylindrical lithium ion secondary battery includes…",
  "path": "/patents/978496",
  "publishedAt": "2014-02-12T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M10/0525",
    "SAMSUNG SDI CO LTD [KR]"
  ],
  "textContent": "The present disclosure relates to a lithium ion secondary battery, which can prevent a cylindrical can from being cracked due to an external shock applied during an assembling process while controlling a rupture pressure of the cylindrical can. The cylindrical lithium ion secondary battery includes a cylindrical can, an electrode assembly accommodated in the cylindrical can with an electrolyte, and a cap assembly sealing the cylindrical can, wherein the cylindrical can has a bottom portion and a side portion extending from the bottom portion to the cap assembly, and a safety vent having a thickness gradient is formed in the bottom portion.",
  "title": "Lithium ion secondary battery"
}