{
  "$type": "site.standard.document",
  "description": "A method of battery cell state estimation includes measuring an initial temperature of a cell grouping in a vehicle, applying a perturbation to the cell grouping in the vehicle for a threshold period of time, and measuring a perturbation temperature of the cell grouping and a voltage of the cell…",
  "path": "/patents/1378280",
  "publishedAt": "2026-01-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R31/367",
    "GM Global Technology Operations LLC"
  ],
  "textContent": "A method of battery cell state estimation includes measuring an initial temperature of a cell grouping in a vehicle, applying a perturbation to the cell grouping in the vehicle for a threshold period of time, and measuring a perturbation temperature of the cell grouping and a voltage of the cell grouping. The method also includes calculating, based on the measured perturbation temperature of the cell grouping and the measured voltage of the cell grouping, an entropy coefficient of the cell grouping, and determining a plateau location based on the measured voltage of the cell grouping. The method further includes generating a state of charge estimate based on the entropy coefficient and the plateau location, and splitting the state of charge estimate and the entropy coefficient into a material level state of lithiation and a material level entropy coefficient.",
  "title": "HYBRID TIME FREQUENCY DOMAIN SYSTEM AND METHOD FOR BATTERY CELL STATE ESTIMATION"
}