{
  "$type": "site.standard.document",
  "description": "In charge rate estimating apparatus and method for a secondary cell, a current flowing through the secondary cell is measured, a voltage across terminals of the secondary cell is measured, an adaptive digital filtering is carried out using a cell model in a continuous time series shown in an…",
  "path": "/patents/1086930",
  "publishedAt": "2004-05-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R31/3648",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "In charge rate estimating apparatus and method for a secondary cell, a current flowing through the secondary cell is measured, a voltage across terminals of the secondary cell is measured, an adaptive digital filtering is carried out using a cell model in a continuous time series shown in an equation (1), all of parameters at one time are estimated, the parameters corresponding to an open-circuit voltage which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s which are transient terms, and, the charge rate is estimated from a relationship between a previously derived open-circuit voltage V0 and the charge rate SOC using the open-circuit voltage V0, V = B(s) DIVIDED A(s)•I+1 DIVIDED C(s)•V0 wherein s denotes a Laplace transform operator, A(s), B(s), and C(s) denote poly-nominal functions of s.",
  "title": "State of charge estimating apparatus and method for a secondary cell"
}