{
  "$type": "site.standard.document",
  "description": "A method for estimating remaining energy in a battery pack having series-connected cells/cell groups includes measuring battery parameters, including a battery voltage, current, and temperature. The controller estimates a static state of charge difference ( ΔSOC) value and a current-dependent ΔSOC…",
  "path": "/patents/1267168",
  "publishedAt": "2020-07-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L58/12",
    "GM Global Technology Operations LLC"
  ],
  "textContent": "A method for estimating remaining energy in a battery pack having series-connected cells/cell groups includes measuring battery parameters, including a battery voltage, current, and temperature. The controller estimates a static state of charge difference ( ΔSOC) value and a current-dependent ΔSOC value in real-time using the parameters, including calculating the static ΔSOC value as a difference between an average SOC of the battery pack and an SOC of a weakest/lowest energy cell group. The current-dependent ΔSOC value is a percentage SOC per unit of the current. The static ΔSOC value and current-dependent ΔSOC values are filtered via a multi-parameter state estimator block. Using the filtered state values, the controller executes a control action responsive to the estimated remaining energy, including displaying the remaining energy and/or a quantity derived from the remaining energy via a display device. A powertrain system includes the controller, electric machine, and battery pack.",
  "title": "METHOD AND SYSTEM FOR ESTIMATING REMAINING BATTERY PACK ENERGY USING CELL-GROUP STATE OF CHARGE SPREAD"
}