{
  "node": {
    "id": "term:parameterisation",
    "type": "Term",
    "label": "Parameterisation",
    "properties": {
      "id": "parameterisation",
      "name": "Parameterisation",
      "aka": [
        "parameter identification"
      ],
      "section": "topic-transport",
      "definition": "Measuring or fitting the numbers a model needs: OCV curves, diffusion coefficients, exchange current densities, thicknesses and porosities for a physics model, or resistances and time constants for a circuit model. It is usually most of the modelling effort.",
      "related": [
        "newman-model",
        "equivalent-circuit-model",
        "gitt",
        "hppc",
        "electrochemical-impedance-spectroscopy"
      ],
      "url": "https://lemonergy.com/learn/glossary/parameterisation/",
      "mentions": [
        "open-circuit-voltage",
        "diffusion"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:2214",
      "source": "term:parameterisation",
      "target": "topic:topic-transport",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:2215",
      "source": "term:parameterisation",
      "target": "term:newman-model",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2216",
      "source": "term:parameterisation",
      "target": "term:equivalent-circuit-model",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2217",
      "source": "term:parameterisation",
      "target": "term:gitt",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2218",
      "source": "term:parameterisation",
      "target": "term:hppc",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2219",
      "source": "term:parameterisation",
      "target": "term:electrochemical-impedance-spectroscopy",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/parameterisation/open-circuit-voltage",
      "source": "term:parameterisation",
      "target": "term:open-circuit-voltage",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/parameterisation/diffusion",
      "source": "term:parameterisation",
      "target": "term:diffusion",
      "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-transport",
      "type": "Topic",
      "label": "Transport and modelling",
      "properties": {
        "id": "topic-transport",
        "name": "Transport and modelling",
        "lede": "How ions move, and the equations and models that describe a cell.",
        "context": "Specify phase, direction and boundaries.",
        "example": "The same concentration difference across 10 μm gives ten times the gradient across 100 μm; at equal D, first-law flux magnitude is ten times greater.",
        "lesson_url": "https://lemonergy.com/learn/transport/ficks-first-law/",
        "lesson_label": "Open diffusion"
      }
    },
    {
      "id": "term:newman-model",
      "type": "Term",
      "label": "Newman model",
      "properties": {
        "id": "newman-model",
        "name": "Newman model",
        "abbr": "P2D",
        "aka": [
          "pseudo-two-dimensional model",
          "Doyle–Fuller–Newman",
          "DFN"
        ],
        "section": "topic-transport",
        "definition": "The standard physics-based lithium-ion cell model: porous-electrode theory across the cell thickness, with solid diffusion solved in a representative spherical particle at every point — hence pseudo-two-dimensional. It predicts voltage from first principles but needs dozens of parameters.",
        "related": [
          "porous-electrode-theory",
          "single-particle-model",
          "butler-volmer",
          "ficks-second-law",
          "parameterisation",
          "pybamm"
        ],
        "url": "https://lemonergy.com/learn/glossary/newman-model/",
        "mentions": [
          "diffusion"
        ]
      }
    },
    {
      "id": "term:equivalent-circuit-model",
      "type": "Term",
      "label": "Equivalent circuit model",
      "properties": {
        "id": "equivalent-circuit-model",
        "name": "Equivalent circuit model",
        "abbr": "ECM",
        "aka": [
          "Thevenin model"
        ],
        "section": "topic-transport",
        "definition": "A cell model built from a voltage source for OCV, a series resistor and one or more RC pairs for the slower dynamics. Its few parameters are fitted from pulse tests, and it is what most battery management systems run in real time.",
        "related": [
          "rc-pair",
          "open-circuit-voltage",
          "hppc",
          "kalman-filter",
          "single-particle-model"
        ],
        "url": "https://lemonergy.com/learn/glossary/equivalent-circuit-model/",
        "mentions": []
      }
    },
    {
      "id": "term:gitt",
      "type": "Term",
      "label": "Galvanostatic intermittent titration technique",
      "properties": {
        "id": "gitt",
        "name": "Galvanostatic intermittent titration technique",
        "abbr": "GITT",
        "section": "topic-testing",
        "definition": "A series of short constant-current pulses each followed by a long rest, so that both the equilibrium voltage curve and the solid diffusion coefficient can be extracted at each state of charge. It is slow, often days per cell, and a staple of parameterisation.",
        "related": [
          "diffusion-coefficient",
          "open-circuit-voltage",
          "parameterisation",
          "pitt",
          "intermittent-current-interruption"
        ],
        "url": "https://lemonergy.com/learn/glossary/gitt/",
        "mentions": [
          "discharge-curve",
          "state-of-charge",
          "diffusion"
        ]
      }
    },
    {
      "id": "term:hppc",
      "type": "Term",
      "label": "Hybrid pulse power characterisation",
      "properties": {
        "id": "hppc",
        "name": "Hybrid pulse power characterisation",
        "abbr": "HPPC",
        "section": "topic-testing",
        "definition": "A test that applies a short discharge pulse and a short charge pulse at each state of charge, from which resistance and power capability are read as a function of SOC. It is the standard source of equivalent-circuit parameters.",
        "related": [
          "equivalent-circuit-model",
          "state-of-power",
          "internal-resistance",
          "dcir",
          "pulse-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/hppc/",
        "mentions": [
          "state-of-charge"
        ]
      }
    },
    {
      "id": "term:electrochemical-impedance-spectroscopy",
      "type": "Term",
      "label": "Electrochemical impedance spectroscopy",
      "properties": {
        "id": "electrochemical-impedance-spectroscopy",
        "name": "Electrochemical impedance spectroscopy",
        "abbr": "EIS",
        "section": "topic-testing",
        "definition": "Measuring a cell’s impedance across a range of frequencies, from kilohertz to millihertz, with a small alternating signal. The spectrum separates ohmic, interface and diffusion processes by their time scale and is read on a Nyquist plot.",
        "related": [
          "nyquist-plot",
          "impedance",
          "randles-circuit",
          "charge-transfer",
          "warburg-impedance"
        ],
        "url": "https://lemonergy.com/learn/glossary/electrochemical-impedance-spectroscopy/",
        "mentions": [
          "diffusion"
        ]
      }
    },
    {
      "id": "term:open-circuit-voltage",
      "type": "Term",
      "label": "Open-circuit voltage",
      "properties": {
        "id": "open-circuit-voltage",
        "name": "Open-circuit voltage",
        "abbr": "OCV",
        "section": "topic-state",
        "definition": "The voltage across a cell’s terminals when no current flows and the cell has rested long enough for the voltage to settle. It depends on state of charge and temperature, and a cell whose open-circuit voltage falls unusually fast in storage may have an internal short.",
        "unit": "V",
        "related": [
          "ocv-soc-curve",
          "relaxation",
          "voltage-hysteresis",
          "k-value",
          "internal-short-circuit"
        ],
        "lesson": "fundamentals/cell-production/#finishing",
        "url": "https://lemonergy.com/learn/glossary/open-circuit-voltage/",
        "mentions": [
          "state-of-charge"
        ]
      }
    },
    {
      "id": "term:diffusion",
      "type": "Term",
      "label": "Diffusion",
      "properties": {
        "id": "diffusion",
        "name": "Diffusion",
        "section": "topic-transport",
        "definition": "The net movement of a species from where it is concentrated to where it is scarce, driven by random thermal motion. In a cell lithium diffuses through the electrolyte in the pores and, far more slowly, through the solid particles themselves.",
        "related": [
          "ficks-first-law",
          "diffusion-coefficient",
          "solid-state-diffusion",
          "concentration-gradient",
          "migration"
        ],
        "lesson": "transport/ficks-first-law/#in-a-cell",
        "url": "https://lemonergy.com/learn/glossary/diffusion/",
        "mentions": [
          "electrolyte"
        ]
      }
    }
  ]
}