{
  "node": {
    "id": "term:thermal-barrier",
    "type": "Term",
    "label": "Thermal barrier",
    "properties": {
      "id": "thermal-barrier",
      "name": "Thermal barrier",
      "aka": [
        "fire-resistant pad",
        "mica sheet"
      ],
      "section": "topic-safety",
      "definition": "An insulating sheet — aerogel, mica, ceramic fibre or intumescent material — placed between cells or modules to slow heat transfer during a thermal event and buy time for occupants to leave.",
      "related": [
        "thermal-propagation",
        "compression-pad",
        "module"
      ],
      "url": "https://lemonergy.com/learn/glossary/thermal-barrier/",
      "mentions": [
        "aerogel",
        "intumescent-material"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:1646",
      "source": "term:thermal-barrier",
      "target": "topic:topic-safety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:1647",
      "source": "term:thermal-barrier",
      "target": "term:thermal-propagation",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1648",
      "source": "term:thermal-barrier",
      "target": "term:compression-pad",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1649",
      "source": "term:thermal-barrier",
      "target": "term:module",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/thermal-barrier/aerogel",
      "source": "term:thermal-barrier",
      "target": "term:aerogel",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/thermal-barrier/intumescent-material",
      "source": "term:thermal-barrier",
      "target": "term:intumescent-material",
      "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: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:compression-pad",
      "type": "Term",
      "label": "Compression pad",
      "properties": {
        "id": "compression-pad",
        "name": "Compression pad",
        "aka": [
          "foam pad",
          "swelling pad"
        ],
        "section": "topic-pack",
        "definition": "A foam sheet between pouch or prismatic cells that keeps a defined pressure on them as they breathe on charge and swell with age. It also provides some thermal separation between neighbours.",
        "related": [
          "swelling",
          "stack-pressure",
          "thermal-barrier",
          "pouch-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/compression-pad/",
        "mentions": []
      }
    },
    {
      "id": "term:module",
      "type": "Term",
      "label": "Module",
      "properties": {
        "id": "module",
        "name": "Module",
        "section": "topic-pack",
        "definition": "A group of cells connected in series and parallel, mechanically held together with its own voltage and temperature sensing, built as the unit from which a pack is assembled and serviced. Cell-to-pack designs do away with it.",
        "related": [
          "cell",
          "pack",
          "series-parallel",
          "cell-to-pack",
          "cell-supervision-circuit"
        ],
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        "url": "https://lemonergy.com/learn/glossary/module/",
        "mentions": []
      }
    },
    {
      "id": "term:aerogel",
      "type": "Term",
      "label": "Aerogel",
      "properties": {
        "id": "aerogel",
        "name": "Aerogel",
        "aka": [
          "silica aerogel",
          "aerogel sheet"
        ],
        "section": "topic-safety",
        "definition": "A solid foam, usually of silica, that is mostly air held in nanometre-scale pores, giving a thermal conductivity of only about 0.015–0.02 W/(m·K). Sheets a millimetre or two thick between cells slow heat transfer during a thermal event, though they must keep their insulation under the compression of swelling cells.",
        "related": [
          "thermal-barrier",
          "thermal-propagation",
          "compression-pad",
          "intumescent-material"
        ],
        "url": "https://lemonergy.com/learn/glossary/aerogel/",
        "mentions": [
          "swelling",
          "thermal-conductivity"
        ]
      }
    },
    {
      "id": "term:intumescent-material",
      "type": "Term",
      "label": "Intumescent material",
      "properties": {
        "id": "intumescent-material",
        "name": "Intumescent material",
        "aka": [
          "intumescent coating",
          "intumescent pad"
        ],
        "section": "topic-safety",
        "definition": "A material that swells to many times its original thickness when heated, forming a porous char that insulates whatever lies beneath. Applied as coatings on pack lids or as pads between cells, it stays thin in normal service and expands only during a thermal event, which suits the tight spaces inside a battery.",
        "related": [
          "thermal-barrier",
          "thermal-propagation",
          "aerogel",
          "enclosure"
        ],
        "url": "https://lemonergy.com/learn/glossary/intumescent-material/",
        "mentions": []
      }
    }
  ]
}