{
  "$type": "site.standard.document",
  "description": "Embodiments of the present disclosure relate to a method and system for estimating State-of-Charge (SoC) of a rechargeable battery, such as for example, a rechargeable battery used to power and electric vehicle (EV). In particular embodiments of the present disclosure are able to estimate SoC of…",
  "path": "/patents/1376476",
  "publishedAt": "2025-08-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R31/387",
    "Analog Devices International Unlimited Company"
  ],
  "textContent": "Embodiments of the present disclosure relate to a method and system for estimating State-of-Charge (SoC) of a rechargeable battery, such as for example, a rechargeable battery used to power and electric vehicle (EV). In particular embodiments of the present disclosure are able to estimate SoC of rechargeable batteries that exhibit charge-discharge hysteresis on their open-circuit voltage (OCV), so that it is not necessarily instantly possible to determine state of charge from the OCV. Embodiments of the present disclosure achieve this by maintaining a measure of current supplied by (and in some embodiments voltage across) the rechargeable battery and applying the measured current (and voltage) to a predictive model that comprises a plurality of parallel time-based filters each having a different time constant ranging for example from tenths of a second to a number of seconds, minutes, or hours. The parallel filters model both the static, nominal OCV response of the battery, as well as the dynamic response, including any charge-discharge cycle voltage hysteresis, with the parallel filter models being linear in their unknowns, and hence solvable by linear regression techniques to find the necessary filter coefficient values. With such an arrangement a significantly more accurate estimation of State-of-Charge of a (vehicular) rechargeable battery is obtained than state of the art charge counting techniques.",
  "title": "STATE OF CHARGE ESTIMATOR FOR BATTERIES WITH VOLTAGE HYSTERESIS"
}