{
  "node": {
    "id": "term:overcharge-test",
    "type": "Term",
    "label": "Overcharge test",
    "properties": {
      "id": "overcharge-test",
      "name": "Overcharge test",
      "section": "topic-safety",
      "definition": "Charging a cell past its upper cutoff, often to 150–200 % of nominal capacity or a fixed voltage, with protection disabled. It shows how much margin the cell has above its window and whether the vent or CID acts before runaway.",
      "related": [
        "overcharge",
        "abuse-testing",
        "current-interrupt-device"
      ],
      "url": "https://lemonergy.com/learn/glossary/overcharge-test/",
      "mentions": [
        "nominal-capacity"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:1741",
      "source": "term:overcharge-test",
      "target": "topic:topic-safety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:1742",
      "source": "term:overcharge-test",
      "target": "term:overcharge",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1743",
      "source": "term:overcharge-test",
      "target": "term:abuse-testing",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1744",
      "source": "term:overcharge-test",
      "target": "term:current-interrupt-device",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/overcharge-test/nominal-capacity",
      "source": "term:overcharge-test",
      "target": "term:nominal-capacity",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:1746",
      "source": "term:overcharge-test",
      "target": "reference:feng-runaway",
      "type": "cites",
      "properties": {
        "sourceFile": "wiki-references.json",
        "scope": "direct technical reference"
      }
    }
  ],
  "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:overcharge",
      "type": "Term",
      "label": "Overcharge",
      "properties": {
        "id": "overcharge",
        "name": "Overcharge",
        "section": "topic-charging",
        "definition": "Charging past the upper cutoff voltage. The positive electrode over-delithiates and releases oxygen, the electrolyte oxidises and lithium plates on the negative, so an unprotected overcharge can end in thermal runaway.",
        "related": [
          "cutoff-voltage",
          "thermal-runaway",
          "bms",
          "overcharge-test",
          "electrolyte-decomposition"
        ],
        "url": "https://lemonergy.com/learn/glossary/overcharge/",
        "mentions": [
          "electrode",
          "positive-electrode",
          "electrolyte"
        ]
      }
    },
    {
      "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:current-interrupt-device",
      "type": "Term",
      "label": "Current interrupt device",
      "properties": {
        "id": "current-interrupt-device",
        "name": "Current interrupt device",
        "abbr": "CID",
        "section": "topic-safety",
        "definition": "A pressure-activated switch in the cap of a cylindrical cell. When internal pressure rises, usually from overcharge, a disc flips and permanently breaks the current path, removing the cell from the circuit before it vents.",
        "related": [
          "vent",
          "overcharge",
          "ptc",
          "cylindrical-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/current-interrupt-device/",
        "mentions": []
      }
    },
    {
      "id": "term:nominal-capacity",
      "type": "Term",
      "label": "Nominal capacity",
      "properties": {
        "id": "nominal-capacity",
        "name": "Nominal capacity",
        "aka": [
          "rated capacity"
        ],
        "section": "topic-ratings",
        "definition": "The charge a cell is rated to deliver under specified test conditions — current, temperature, rest and voltage limits — usually in ampere-hours.",
        "unit": "Ah",
        "related": [
          "ampere-hour",
          "c-rate",
          "capacity-test",
          "usable-capacity",
          "state-of-health"
        ],
        "lesson": "fundamentals/capacity-and-c-rate/#nominal-capacity",
        "url": "https://lemonergy.com/learn/glossary/nominal-capacity/",
        "mentions": []
      }
    },
    {
      "id": "reference:feng-runaway",
      "type": "Reference",
      "label": "Thermal runaway mechanism of lithium ion battery for electric vehicles: A review",
      "properties": {
        "title": "Thermal runaway mechanism of lithium ion battery for electric vehicles: A review",
        "publisher": "Energy Storage Materials",
        "url": "https://doi.org/10.1016/j.ensm.2017.05.013",
        "type": "Review article",
        "scope": "Electrical, mechanical and thermal abuse; thermal-runaway mechanisms and propagation.",
        "year": 2018,
        "authors": [
          "Xuning Feng et al."
        ],
        "accessed": "2026-10-27"
      }
    }
  ]
}