{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A relay diagnosis apparatus according to the present disclosure includes a first voltage detection circuit to generate a first diagnosis voltage at a voltage between a positive electrode terminal of a battery assembly and a chassis; a second voltage detection circuit to generate a second diagnosis…",
  "path": "/patents/1404105",
  "publishedAt": "2026-03-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L3/00",
    "LG ENERGY SOLUTION LTD [KR]"
  ],
  "textContent": "A relay diagnosis apparatus according to the present disclosure includes a first voltage detection circuit to generate a first diagnosis voltage at a voltage between a positive electrode terminal of a battery assembly and a chassis; a second voltage detection circuit to generate a second diagnosis voltage at a voltage between a negative electrode terminal of the battery assembly and the chassis; and a controller to determine a first insulation resistance between the positive electrode terminal and the chassis and a second insulation resistance between the negative electrode terminal and the chassis based on the first diagnosis voltage at a first time point and the second diagnosis voltage at a second time point while the first relay and the second relay are being controlled into an off-state. The controller determines a third insulation resistance between the positive electrode terminal and the chassis and a fourth insulation resistance between the negative electrode terminal and the chassis based on the first diagnosis voltage at a third time point and the second diagnosis voltage at a fourth time point while the first relay and the second relay are being controlled into an on-state. The controller detects a fault of at least one of the first relay or the second relay based on the first to fourth insulation resistances.",
  "title": "RELAY DIAGNOSIS DEVICE, RELAY DIAGNOSIS METHOD, BATTERY SYSTEM, AND ELECTRIC VEHICLE"
}