{
  "$type": "site.standard.document",
  "description": "A pressure maintenance device includes: a hydraulic device inside a housing of a battery module together with a plurality of battery cells, the hydraulic device being configured to change its volume to offset a pressure change inside the housing due to deformation of the plurality of battery cells…",
  "path": "/patents/1392499",
  "publishedAt": "2025-07-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F15B1/04",
    "SAMSUNG SDI CO LTD [KR]"
  ],
  "textContent": "A pressure maintenance device includes: a hydraulic device inside a housing of a battery module together with a plurality of battery cells, the hydraulic device being configured to change its volume to offset a pressure change inside the housing due to deformation of the plurality of battery cells; an accumulator connected to the hydraulic device through a pipe, the accumulator being configured to store fluid and to discharge the fluid to the pipe or to store the fluid introduced from the pipe according to a change in a volume of the hydraulic device; a heater configured to heat the accumulator; and a controller configured to control the heater according to an outdoor air temperature.",
  "title": "PRESSURE MAINTENANCE DEVICE AND BATTERY SYSTEM INCLUDING THE SAME"
}