{
  "$type": "site.standard.document",
  "description": "A secondary battery diagnosing apparatus includes a thickness sensor configured to sense a change in thickness of a secondary battery according to a volume change of a negative electrode active material while the secondary battery comprising a negative electrode active material containing silicon…",
  "path": "/patents/1381519",
  "publishedAt": "2026-04-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J7/84",
    "LG ENERGY SOLUTION, LTD."
  ],
  "textContent": "A secondary battery diagnosing apparatus includes a thickness sensor configured to sense a change in thickness of a secondary battery according to a volume change of a negative electrode active material while the secondary battery comprising a negative electrode active material containing silicon or silicon oxide is being charged or discharged; and a processor configured to estimate a capacity ratio, which is a ratio of a capacity provided by the silicon or the silicon oxide to a capacity of the secondary battery provided by the negative electrode active material, using a sensing result of the thickness sensor, and diagnose the state of the secondary battery based on the capacity ratio.",
  "title": "SECONDARY BATTERY DIAGNOSING APPARATUS AND METHOD"
}