{
  "node": {
    "id": "term:cell-holder",
    "type": "Term",
    "label": "Cell holder",
    "properties": {
      "id": "cell-holder",
      "name": "Cell holder",
      "aka": [
        "cell bracket",
        "cell carrier",
        "cell spacer",
        "cell frame"
      ],
      "section": "topic-pack",
      "definition": "A moulded plastic frame with a socket for each cylindrical cell, which fixes the spacing, stops cells rubbing through their wrappers under vibration and leaves gaps for air or potting. A few millimetres between cells also slows thermal propagation; many automotive modules use the same idea at larger scale.",
      "related": [
        "cylindrical-cell",
        "cell-packing-arrangement",
        "thermal-propagation",
        "potting-compound"
      ],
      "url": "https://lemonergy.com/learn/glossary/cell-holder/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:belongsTo/term:cell-holder/topic:topic-pack",
      "source": "term:cell-holder",
      "target": "topic:topic-pack",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:relatedTo/term:cell-holder/term:cylindrical-cell",
      "source": "term:cell-holder",
      "target": "term:cylindrical-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:cell-holder/term:cell-packing-arrangement",
      "source": "term:cell-holder",
      "target": "term:cell-packing-arrangement",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:cell-holder/term:thermal-propagation",
      "source": "term:cell-holder",
      "target": "term:thermal-propagation",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:cell-holder/term:potting-compound",
      "source": "term:cell-holder",
      "target": "term:potting-compound",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-pack",
      "type": "Topic",
      "label": "Modules, packs and battery management",
      "properties": {
        "id": "topic-pack",
        "name": "Modules, packs and battery management",
        "lede": "From a single cell to a working battery system, and the electronics that keep it safe.",
        "context": "Make series/parallel architecture explicit.",
        "example": "Twelve 3.6 V, 5 Ah cells in 6s2p give 21.6 V, 10 Ah and 216 Wh nominally before other restrictions.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-architecture/",
        "lesson_label": "Open cell architecture"
      }
    },
    {
      "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:cell-packing-arrangement",
      "type": "Term",
      "label": "Cell packing arrangement",
      "properties": {
        "id": "cell-packing-arrangement",
        "name": "Cell packing arrangement",
        "aka": [
          "hexagonal packing",
          "nested layout",
          "staggered layout",
          "square packing",
          "cubic layout"
        ],
        "section": "topic-pack",
        "definition": "How round cells sit side by side. Square packing, in rows and columns, fills π/4 ≈ 78.5 % of the footprint and leaves straight channels for cooling; hexagonal or nested packing, each row shifted by half a cell, fills π/(2√3) ≈ 90.7 % and needs about 13 % less area for the same cells.",
        "related": [
          "cylindrical-cell",
          "cell-holder",
          "cell-to-pack-ratio",
          "thermal-management",
          "series-parallel"
        ],
        "url": "https://lemonergy.com/learn/glossary/cell-packing-arrangement/",
        "mentions": []
      }
    },
    {
      "id": "term:thermal-propagation",
      "type": "Term",
      "label": "Thermal propagation",
      "properties": {
        "id": "thermal-propagation",
        "name": "Thermal propagation",
        "section": "topic-safety",
        "definition": "Thermal runaway spreading from one cell to its neighbours through conducted heat, hot gas and flame. Pack designs are judged by whether, and how slowly, a single failing cell takes the rest with it.",
        "related": [
          "thermal-runaway",
          "thermal-barrier",
          "venting",
          "module",
          "propagation-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/thermal-propagation/",
        "mentions": []
      }
    },
    {
      "id": "term:potting-compound",
      "type": "Term",
      "label": "Potting compound",
      "properties": {
        "id": "potting-compound",
        "name": "Potting compound",
        "aka": [
          "potting",
          "encapsulant"
        ],
        "section": "topic-pack",
        "definition": "A liquid resin — polyurethane, silicone or epoxy, sometimes foamed — poured around cells or electronics and cured into a solid block. It fixes cells against vibration, insulates them and can slow thermal propagation; some structural packs fill every gap between cylindrical cells with it. The cost is mass and a pack that is hard to repair or recycle.",
        "related": [
          "structural-adhesive",
          "thermal-propagation",
          "design-for-recycling",
          "dismantling",
          "vibration-test",
          "conformal-coating"
        ],
        "url": "https://lemonergy.com/learn/glossary/potting-compound/",
        "mentions": []
      }
    }
  ]
}