{
  "node": {
    "id": "term:vent",
    "type": "Term",
    "label": "Vent",
    "properties": {
      "id": "vent",
      "name": "Vent",
      "aka": [
        "burst disc",
        "rupture disc"
      ],
      "section": "topic-safety",
      "definition": "A scored area or a membrane in the cell can that opens at a set pressure, around ten to thirty bar for a cylindrical cell, so that gas escapes in a chosen direction instead of the case splitting at random.",
      "related": [
        "venting",
        "can",
        "current-interrupt-device"
      ],
      "url": "https://lemonergy.com/learn/glossary/vent/",
      "mentions": [
        "cylindrical-cell"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:1675",
      "source": "term:vent",
      "target": "topic:topic-safety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:1676",
      "source": "term:vent",
      "target": "term:venting",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1677",
      "source": "term:vent",
      "target": "term:can",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1678",
      "source": "term:vent",
      "target": "term:current-interrupt-device",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/vent/cylindrical-cell",
      "source": "term:vent",
      "target": "term:cylindrical-cell",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-safety",
      "type": "Topic",
      "label": "Safety and abuse",
      "properties": {
        "id": "topic-safety",
        "name": "Safety and abuse",
        "lede": "How cells fail dangerously, how that is tested, and what is built in to stop it.",
        "context": "Connect mechanisms with appropriate test evidence.",
        "example": "A low normal-load temperature does not demonstrate thermal-runaway containment.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-aging/",
        "lesson_label": "Open degradation mechanisms"
      }
    },
    {
      "id": "term:venting",
      "type": "Term",
      "label": "Venting",
      "properties": {
        "id": "venting",
        "name": "Venting",
        "section": "topic-safety",
        "definition": "The controlled release of gas and vapour from a cell whose internal pressure has risen too far, through a vent designed to open before the case bursts. The vented gas is flammable and toxic, so packs route it away from occupants.",
        "related": [
          "vent",
          "gas-generation",
          "thermal-runaway",
          "off-gas"
        ],
        "url": "https://lemonergy.com/learn/glossary/venting/",
        "mentions": []
      }
    },
    {
      "id": "term:can",
      "type": "Term",
      "label": "Can",
      "properties": {
        "id": "can",
        "name": "Can",
        "aka": [
          "casing",
          "housing"
        ],
        "section": "topic-components",
        "definition": "The rigid metal case of a cylindrical or prismatic cell, usually nickel-plated steel or aluminium. It holds the stack under pressure, contains the electrolyte and, in a cylindrical cell, doubles as the negative terminal.",
        "related": [
          "cylindrical-cell",
          "prismatic-cell",
          "pouch-foil",
          "vent",
          "helium-leak-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/can/",
        "mentions": [
          "electrolyte"
        ]
      }
    },
    {
      "id": "term:current-interrupt-device",
      "type": "Term",
      "label": "Current interrupt device",
      "properties": {
        "id": "current-interrupt-device",
        "name": "Current interrupt device",
        "abbr": "CID",
        "section": "topic-safety",
        "definition": "A pressure-activated switch in the cap of a cylindrical cell. When internal pressure rises, usually from overcharge, a disc flips and permanently breaks the current path, removing the cell from the circuit before it vents.",
        "related": [
          "vent",
          "overcharge",
          "ptc",
          "cylindrical-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/current-interrupt-device/",
        "mentions": []
      }
    },
    {
      "id": "term:cylindrical-cell",
      "type": "Term",
      "label": "Cylindrical cell",
      "properties": {
        "id": "cylindrical-cell",
        "name": "Cylindrical cell",
        "aka": [
          "18650",
          "21700",
          "4680"
        ],
        "section": "topic-chemistries",
        "definition": "A cell made by winding the electrodes into a jelly roll and sealing it in a round metal can. Sizes are named by their dimensions: a 21700 cell is 21 mm across and 70 mm long.",
        "related": [
          "jelly-roll",
          "can",
          "tabless-design",
          "prismatic-cell",
          "pouch-cell",
          "centre-pin"
        ],
        "lesson": "fundamentals/cell-production/#formats",
        "example": {
          "title": "Shape versus ratings",
          "text": "A cylindrical shape does not supply the model’s capacity, resistance or voltage limits; those belong to the actual cell."
        },
        "url": "https://lemonergy.com/learn/glossary/cylindrical-cell/",
        "mentions": [
          "winding"
        ]
      }
    }
  ]
}