{
  "node": {
    "id": "term:instrumented-cell",
    "type": "Term",
    "label": "Instrumented cell",
    "properties": {
      "id": "instrumented-cell",
      "name": "Instrumented cell",
      "aka": [
        "sensorised cell",
        "embedded sensors",
        "fibre Bragg grating",
        "FBG"
      ],
      "section": "topic-testing",
      "definition": "A cell built or modified with sensors inside — thermocouples in the jelly roll, optical fibres with Bragg gratings for temperature and strain, reference electrodes, pressure sensors — to measure what surface sensors miss. At high current the core can run several degrees hotter than the can, which only such cells show directly.",
      "related": [
        "temperature-sensor",
        "reference-electrode",
        "three-electrode-cell",
        "thermal-model",
        "jelly-roll"
      ],
      "url": "https://lemonergy.com/learn/glossary/instrumented-cell/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:5389",
      "source": "term:instrumented-cell",
      "target": "topic:topic-testing",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:5390",
      "source": "term:instrumented-cell",
      "target": "term:temperature-sensor",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5391",
      "source": "term:instrumented-cell",
      "target": "term:reference-electrode",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5392",
      "source": "term:instrumented-cell",
      "target": "term:three-electrode-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5393",
      "source": "term:instrumented-cell",
      "target": "term:thermal-model",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5394",
      "source": "term:instrumented-cell",
      "target": "term:jelly-roll",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "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:temperature-sensor",
      "type": "Term",
      "label": "Temperature sensor",
      "properties": {
        "id": "temperature-sensor",
        "name": "Temperature sensor",
        "abbr": "NTC",
        "aka": [
          "thermistor"
        ],
        "section": "topic-thermal",
        "definition": "Usually a negative-temperature-coefficient thermistor glued to a busbar or cell surface, with a few per module. Because sensors read the surface, the hottest point inside a cell can run several degrees higher than the BMS sees.",
        "unit": "°C",
        "related": [
          "bms",
          "thermal-management",
          "operating-temperature",
          "derating",
          "thermocouples-rtds",
          "virtual-temperature-sensor"
        ],
        "url": "https://lemonergy.com/learn/glossary/temperature-sensor/",
        "mentions": [
          "busbar"
        ]
      }
    },
    {
      "id": "term:reference-electrode",
      "type": "Term",
      "label": "Reference electrode",
      "properties": {
        "id": "reference-electrode",
        "name": "Reference electrode",
        "section": "topic-testing",
        "definition": "An electrode of stable, known potential against which another is measured. In lithium-ion work it is a piece of lithium metal, which defines the Li/Li⁺ scale; outside it the standard hydrogen electrode is the primary reference.",
        "related": [
          "three-electrode-cell",
          "electrode-potential",
          "standard-potential"
        ],
        "url": "https://lemonergy.com/learn/glossary/reference-electrode/",
        "mentions": [
          "electrode",
          "standard-hydrogen-electrode"
        ]
      }
    },
    {
      "id": "term:three-electrode-cell",
      "type": "Term",
      "label": "Three-electrode cell",
      "properties": {
        "id": "three-electrode-cell",
        "name": "Three-electrode cell",
        "section": "topic-testing",
        "definition": "A full cell with an added reference electrode, so the potential of each working electrode can be tracked separately during cycling. It reveals, for instance, when the graphite potential drops below 0 V and plating begins.",
        "related": [
          "reference-electrode",
          "full-cell",
          "lithium-plating",
          "electrode-potential"
        ],
        "url": "https://lemonergy.com/learn/glossary/three-electrode-cell/",
        "mentions": [
          "electrode",
          "graphite",
          "working-and-counter-electrode"
        ]
      }
    },
    {
      "id": "term:thermal-model",
      "type": "Term",
      "label": "Thermal model",
      "properties": {
        "id": "thermal-model",
        "name": "Thermal model",
        "aka": [
          "lumped thermal model"
        ],
        "section": "topic-thermal",
        "definition": "A model of cell temperature: at its simplest one thermal mass with heat generation inside and convection outside, at its most detailed a 3D simulation of the pack. Temperature feeds back into every rate, so electrical and thermal models are usually solved together.",
        "related": [
          "heat-generation",
          "thermal-management",
          "arrhenius",
          "newman-model",
          "thermal-characterisation"
        ],
        "url": "https://lemonergy.com/learn/glossary/thermal-model/",
        "mentions": [
          "thermal-mass",
          "heat-transfer-modes"
        ]
      }
    },
    {
      "id": "term:jelly-roll",
      "type": "Term",
      "label": "Jelly roll",
      "properties": {
        "id": "jelly-roll",
        "name": "Jelly roll",
        "section": "topic-components",
        "definition": "Electrodes and separators wound together into a spiral. It is the inside of a cylindrical cell and of many prismatic cells; large pouch cells usually use stacked sheets instead.",
        "related": [
          "winding",
          "cylindrical-cell",
          "prismatic-cell",
          "stacking"
        ],
        "lesson": "fundamentals/cell-architecture/#whole-cell",
        "example": {
          "title": "Unroll the geometry",
          "text": "A wound assembly contains long electrode and separator strips; the cylindrical exterior does not make its electrodes solid cylinders."
        },
        "url": "https://lemonergy.com/learn/glossary/jelly-roll/",
        "mentions": []
      }
    }
  ]
}