{
  "node": {
    "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"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:606",
      "source": "term:can",
      "target": "topic:topic-components",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:607",
      "source": "term:can",
      "target": "term:cylindrical-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:608",
      "source": "term:can",
      "target": "term:prismatic-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:609",
      "source": "term:can",
      "target": "term:pouch-foil",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:610",
      "source": "term:can",
      "target": "term:vent",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:611",
      "source": "term:can",
      "target": "term:helium-leak-test",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/can/electrolyte",
      "source": "term:can",
      "target": "term:electrolyte",
      "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-components",
      "type": "Topic",
      "label": "Cell components and electrode materials",
      "properties": {
        "id": "topic-components",
        "name": "Cell components and electrode materials",
        "lede": "What a cell is physically made of — active materials, binders, additives, foils and tabs — and how its electrodes are put together.",
        "context": "Connect each material with its function.",
        "example": "Electrons travel through additive, foil and tab; ions use electrolyte and separator pathways.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-anatomy/",
        "lesson_label": "Open cell anatomy"
      }
    },
    {
      "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"
        ]
      }
    },
    {
      "id": "term:prismatic-cell",
      "type": "Term",
      "label": "Prismatic cell",
      "properties": {
        "id": "prismatic-cell",
        "name": "Prismatic cell",
        "section": "topic-chemistries",
        "definition": "A cell in a rigid rectangular metal case, holding either a flattened jelly roll or stacked sheets. Large prismatic cells pack tightly into battery packs.",
        "related": [
          "can",
          "jelly-roll",
          "stacking",
          "cylindrical-cell",
          "pouch-cell"
        ],
        "lesson": "fundamentals/cell-production/#formats",
        "example": {
          "title": "Geometry is one constraint",
          "text": "Two rectangular cells can fit similar spaces but use different terminals and electrical ratings."
        },
        "url": "https://lemonergy.com/learn/glossary/prismatic-cell/",
        "mentions": []
      }
    },
    {
      "id": "term:pouch-foil",
      "type": "Term",
      "label": "Pouch foil",
      "properties": {
        "id": "pouch-foil",
        "name": "Pouch foil",
        "aka": [
          "aluminium laminate"
        ],
        "section": "topic-components",
        "definition": "The flexible case of a pouch cell: a thin aluminium layer laminated between a polyamide outer film and a heat-sealable polypropylene inner film. It is light and cheap but offers no mechanical support and can swell.",
        "related": [
          "pouch-cell",
          "can",
          "swelling"
        ],
        "url": "https://lemonergy.com/learn/glossary/pouch-foil/",
        "mentions": [
          "polyethylene-polypropylene"
        ]
      }
    },
    {
      "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"
        ]
      }
    },
    {
      "id": "term:helium-leak-test",
      "type": "Term",
      "label": "Helium leak test",
      "properties": {
        "id": "helium-leak-test",
        "name": "Helium leak test",
        "aka": [
          "leak test",
          "helium bombing",
          "tracer-gas leak test"
        ],
        "section": "topic-testing",
        "definition": "Checking that a cell can, pouch or cooling plate is sealed by detecting, with a mass spectrometer, helium escaping from it into a vacuum chamber. Helium goes in before sealing or is forced in under pressure afterwards; cells are typically screened at around 10⁻⁶ mbar·L/s, tight enough to keep moisture out and electrolyte in for the cell’s life.",
        "unit": "mbar·L/s",
        "related": [
          "can",
          "pouch-cell",
          "moisture-content",
          "end-of-line-testing",
          "cooling-plate"
        ],
        "url": "https://lemonergy.com/learn/glossary/helium-leak-test/",
        "mentions": [
          "electrolyte"
        ]
      }
    },
    {
      "id": "term:electrolyte",
      "type": "Term",
      "label": "Electrolyte",
      "properties": {
        "id": "electrolyte",
        "name": "Electrolyte",
        "section": "topic-electrolytes",
        "definition": "The ion-conducting medium between the electrodes. In a liquid-electrolyte cell it fills the pores of both electrodes and the separator, so it is not a separate structural layer.",
        "related": [
          "lithium-salt",
          "carbonate-solvent",
          "electrolyte-additive",
          "ionic-conductivity",
          "solid-electrolyte",
          "ionic-liquid-electrolyte"
        ],
        "lesson": "fundamentals/cell-architecture/#electrolyte",
        "example": {
          "title": "Ions and electrons",
          "text": "Electrolyte carries ions between electrodes; the external circuit carries electrons. The two paths serve different roles."
        },
        "url": "https://lemonergy.com/learn/glossary/electrolyte/",
        "mentions": [
          "separator"
        ]
      }
    }
  ]
}