{
  "$type": "site.standard.document",
  "description": "An electric storage device includes an electric storage unit that includes one or a plurality of electric storage elements, a measurement unit that measures voltage, a current, and a temperature of the electric storage element, and a calculation unit that calculates internal resistance of the…",
  "path": "/patents/968015",
  "publishedAt": "2014-10-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L3/0046",
    "SONY CORP [JP]"
  ],
  "textContent": "An electric storage device includes an electric storage unit that includes one or a plurality of electric storage elements, a measurement unit that measures voltage, a current, and a temperature of the electric storage element, and a calculation unit that calculates internal resistance of the electric storage element based on the voltage, the current, and the temperature measured by the measurement unit. When a determination unit detects discontinuity of temporal variation of the calculated internal resistance, it is determined that the electric storage element has been exchanged. Since the electric storage element such as a lithium ion secondary battery has such a characteristic that the internal resistance increases as the number of use is increased, the exchange of batteries can be detected from the change in the internal resistance.",
  "title": "ELECTRICAL STORAGE DEVICE, ELECTRONIC INSTRUMENT, POWER SYSTEM, AND ELECTRIC VEHICLE"
}