{
  "node": {
    "id": "term:impact-test",
    "type": "Term",
    "label": "Impact test",
    "properties": {
      "id": "impact-test",
      "name": "Impact test",
      "aka": [
        "UN 38.3 T6",
        "T.6 impact",
        "bar impact test"
      ],
      "section": "topic-testing",
      "definition": "Dropping a 9.1 kg mass from 61 cm onto a 15.8 mm steel bar laid across a cell, to simulate a crushing blow. In UN 38.3 test T.6 it applies to cylindrical cells of 18 mm diameter or more — smaller round, prismatic, pouch and coin cells are crushed instead — and the cell must stay below 170 °C without fire or disassembly.",
      "related": [
        "crush-test",
        "transport-regulations",
        "abuse-testing",
        "cylindrical-cell"
      ],
      "url": "https://lemonergy.com/learn/glossary/impact-test/",
      "mentions": [
        "dismantling",
        "shredding"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:belongsTo/term:impact-test/topic:topic-testing",
      "source": "term:impact-test",
      "target": "topic:topic-testing",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:relatedTo/term:impact-test/term:crush-test",
      "source": "term:impact-test",
      "target": "term:crush-test",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:impact-test/term:transport-regulations",
      "source": "term:impact-test",
      "target": "term:transport-regulations",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:impact-test/term:abuse-testing",
      "source": "term:impact-test",
      "target": "term:abuse-testing",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:impact-test/term:cylindrical-cell",
      "source": "term:impact-test",
      "target": "term:cylindrical-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/impact-test/dismantling",
      "source": "term:impact-test",
      "target": "term:dismantling",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
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    {
      "id": "edge:mentions/impact-test/shredding",
      "source": "term:impact-test",
      "target": "term:shredding",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
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  ],
  "neighbors": [
    {
      "id": "topic:topic-testing",
      "type": "Topic",
      "label": "Testing methods",
      "properties": {
        "id": "topic-testing",
        "name": "Testing methods",
        "lede": "The measurements and test procedures that characterise a cell or pack, from capacity and pulse tests to abuse and environmental tests.",
        "context": "Record specimen, state, instrument, temperature and timing.",
        "example": "Resistance immediately after a current step can differ from a ten-second value because slower polarization contributes.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/",
        "lesson_label": "Open capacity measurements"
      }
    },
    {
      "id": "term:crush-test",
      "type": "Term",
      "label": "Crush test",
      "properties": {
        "id": "crush-test",
        "name": "Crush test",
        "section": "topic-safety",
        "definition": "Deforming a cell or pack between a platen and a round bar or sphere until the voltage drops or a set force is reached, to reproduce a crash. It checks whether the case and separator fail gracefully or cause a short.",
        "related": [
          "abuse-testing",
          "internal-short-circuit",
          "nail-penetration",
          "vehicle-crash-test",
          "impact-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/crush-test/",
        "mentions": [
          "separator"
        ]
      }
    },
    {
      "id": "term:transport-regulations",
      "type": "Term",
      "label": "UN 38.3",
      "properties": {
        "id": "transport-regulations",
        "name": "UN 38.3",
        "aka": [
          "UN transport test",
          "lithium battery shipping"
        ],
        "section": "topic-standards-vehicle",
        "definition": "The United Nations test sequence that every lithium cell and battery must pass before it can be shipped: altitude, thermal cycling, vibration, shock, external short, impact or crush, overcharge and forced discharge. Air shipment of cells also caps state of charge at 30 %.",
        "related": [
          "shipping-soc",
          "abuse-testing",
          "iec-62133",
          "altitude-simulation-test",
          "un-38-3-test-summary",
          "forced-discharge-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/transport-regulations/",
        "mentions": [
          "overcharge",
          "state-of-charge"
        ]
      }
    },
    {
      "id": "term:abuse-testing",
      "type": "Term",
      "label": "Abuse testing",
      "properties": {
        "id": "abuse-testing",
        "name": "Abuse testing",
        "section": "topic-safety",
        "definition": "Deliberately driving cells and packs beyond their limits — overcharge, crush, nail penetration, external short, heating, drop — to see how they fail. Standards define each test and rank the outcome on a hazard scale from no effect to explosion.",
        "related": [
          "nail-penetration",
          "overcharge-test",
          "crush-test",
          "short-circuit-test",
          "hazard-level",
          "oven-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/abuse-testing/",
        "mentions": [
          "overcharge"
        ]
      }
    },
    {
      "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:dismantling",
      "type": "Term",
      "label": "Dismantling",
      "properties": {
        "id": "dismantling",
        "name": "Dismantling",
        "aka": [
          "disassembly",
          "pack disassembly"
        ],
        "section": "topic-recycling",
        "definition": "Taking a pack apart down to modules or cells to recover the casing, busbars, cables and electronics separately and to send only the cells on. It is still largely manual; robotic disassembly is held back by the variety of designs, glue and potting.",
        "related": [
          "deactivation",
          "design-for-recycling",
          "shredding",
          "remanufacturing"
        ],
        "url": "https://lemonergy.com/learn/glossary/dismantling/",
        "mentions": [
          "potting-compound"
        ]
      }
    },
    {
      "id": "term:shredding",
      "type": "Term",
      "label": "Shredding",
      "properties": {
        "id": "shredding",
        "name": "Shredding",
        "aka": [
          "crushing",
          "comminution",
          "wet shredding",
          "inert shredding"
        ],
        "section": "topic-recycling",
        "definition": "Breaking cells or modules into fragments, under an inert gas, in a liquid or in a vacuum so that the released electrolyte and any remaining charge cannot ignite. Off-gas treatment captures the solvent vapour and the hydrogen fluoride it forms.",
        "related": [
          "mechanical-pretreatment",
          "deactivation",
          "electrolyte-recovery",
          "hydrofluoric-acid"
        ],
        "url": "https://lemonergy.com/learn/glossary/shredding/",
        "mentions": [
          "electrolyte",
          "off-gas"
        ]
      }
    }
  ]
}