{
  "$type": "site.standard.document",
  "description": "A difference voltmeter (DVM) is used in a battery testing apparatus for determining values of open-circuit voltage, self-discharge, self-discharge rate and internal resistance of batteries. A reference voltage Vref is generated. A difference OCV relative to Vref is determined at times t1 and t2 as…",
  "path": "/patents/1354660",
  "publishedAt": "2023-11-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R31/3835",
    "Chaojiong Zhang"
  ],
  "textContent": "A difference voltmeter (DVM) is used in a battery testing apparatus for determining values of open-circuit voltage, self-discharge, self-discharge rate and internal resistance of batteries. A reference voltage Vref is generated. A difference OCV relative to Vref is determined at times t1 and t2 as ΔOCV1 and ΔOCV2. The SD for a battery is determined as (ΔOCV2−ΔOCV1), and the SDR is determined as SD/(t2−t1). The IR of a battery is determined by measuring voltage at two levels of direct current and calculating IR as equal to (ΔV2−ΔV1)/(I2−I1). The smaller FSR of the DVM allows a more accurate measurement of OCV, which allows the time for determining the SDR to be reduced.",
  "title": "System for Determining Battery Parameters"
}