{
  "node": {
    "id": "term:fault-tree-analysis",
    "type": "Term",
    "label": "Fault tree analysis",
    "properties": {
      "id": "fault-tree-analysis",
      "name": "Fault tree analysis",
      "abbr": "FTA",
      "section": "topic-safety",
      "definition": "A top-down safety analysis that starts from one undesired event, such as thermal runaway reaching the cabin, and breaks it into the combinations of failures that could cause it, linked by AND and OR gates. With failure rates attached it yields a probability; it complements the bottom-up FMEA and is standardised in IEC 61025.",
      "related": [
        "fmea",
        "functional-safety",
        "thermal-runaway",
        "hazard-level"
      ],
      "url": "https://lemonergy.com/learn/glossary/fault-tree-analysis/",
      "mentions": []
    }
  },
  "edges": [
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      "id": "edge:6625",
      "source": "term:fault-tree-analysis",
      "target": "topic:topic-safety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:6626",
      "source": "term:fault-tree-analysis",
      "target": "term:fmea",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:6627",
      "source": "term:fault-tree-analysis",
      "target": "term:functional-safety",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:6628",
      "source": "term:fault-tree-analysis",
      "target": "term:thermal-runaway",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:6629",
      "source": "term:fault-tree-analysis",
      "target": "term:hazard-level",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; 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:fmea",
      "type": "Term",
      "label": "Failure mode and effects analysis",
      "properties": {
        "id": "fmea",
        "name": "Failure mode and effects analysis",
        "abbr": "FMEA",
        "section": "topic-hvsafety",
        "definition": "A structured review that lists every way a component or process could fail, its effect, and how likely it is to happen and be detected, scoring each to prioritise fixes. Battery programmes run it on the cell, the pack design and the production process.",
        "related": [
          "functional-safety",
          "abuse-testing",
          "cell-design",
          "fault-tree-analysis"
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        "url": "https://lemonergy.com/learn/glossary/fmea/",
        "mentions": []
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      "id": "term:functional-safety",
      "type": "Term",
      "label": "Functional safety",
      "properties": {
        "id": "functional-safety",
        "name": "Functional safety",
        "abbr": "ISO 26262",
        "aka": [
          "ASIL"
        ],
        "section": "topic-hvsafety",
        "definition": "The discipline, standardised for vehicles in ISO 26262, of making sure electronic failures do not cause harm. Battery functions such as overvoltage protection are classified by risk into ASIL levels A to D, which set how redundant and verified their hardware and software must be.",
        "related": [
          "bms",
          "high-voltage-interlock",
          "insulation-resistance",
          "fmea",
          "mcu",
          "iso-13849"
        ],
        "url": "https://lemonergy.com/learn/glossary/functional-safety/",
        "mentions": []
      }
    },
    {
      "id": "term:thermal-runaway",
      "type": "Term",
      "label": "Thermal runaway",
      "properties": {
        "id": "thermal-runaway",
        "name": "Thermal runaway",
        "section": "topic-safety",
        "definition": "Self-accelerating heating in a cell: heat speeds up reactions that release more heat, until the cell vents, catches fire or ruptures. An internal short, overcharge or external heating can trigger it.",
        "related": [
          "onset-temperature",
          "thermal-propagation",
          "venting",
          "separator-shutdown",
          "thermal-runaway-energy",
          "exothermic"
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        "lesson": "fundamentals/cell-anatomy/#short-circuit",
        "url": "https://lemonergy.com/learn/glossary/thermal-runaway/",
        "mentions": [
          "overcharge"
        ]
      }
    },
    {
      "id": "term:hazard-level",
      "type": "Term",
      "label": "Hazard level",
      "properties": {
        "id": "hazard-level",
        "name": "Hazard level",
        "aka": [
          "EUCAR hazard level"
        ],
        "section": "topic-safety",
        "definition": "A scale, 0 to 7, for grading the outcome of an abuse test: from no effect through leakage, venting and fire to rupture and explosion. Vehicle programmes typically require that no cell test exceed level 4, venting without flame.",
        "related": [
          "abuse-testing",
          "venting",
          "thermal-runaway"
        ],
        "url": "https://lemonergy.com/learn/glossary/hazard-level/",
        "mentions": []
      }
    }
  ]
}