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      "id": "workflow:pulse-protocol",
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        "definition": "Internal resistance measured from the voltage change during a current pulse of defined length, usually 10 s or 18 s. It is larger than the AC value because it includes charge-transfer and some diffusion, and it depends on SOC, temperature and pulse duration.",
        "unit": "mΩ",
        "related": [
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        "definition": "The resistance a cell presents to current, from its foils, electrolyte, interfaces and the reactions themselves. It converts part of the delivered energy into heat, sets the voltage drop under load, and rises as the cell ages; a large automotive cell has about a milliohm, a small cylindrical cell tens.",
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      "properties": {
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          "rest"
        ],
        "section": "topic-charging",
        "definition": "The slow recovery of a cell’s voltage towards open-circuit voltage after current stops, as concentration gradients inside the electrodes level out. It takes minutes to hours, which is why OCV measurements need a rest period.",
        "related": [
          "open-circuit-voltage",
          "polarization",
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        ],
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        "mentions": []
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    },
    {
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        "abbr": "ECM",
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        "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.",
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    {
      "id": "term:polarization",
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        "id": "polarization",
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          "overvoltage"
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        "section": "topic-charging",
        "definition": "The gap between a cell’s terminal voltage under load and its open-circuit voltage. It has ohmic, charge-transfer and concentration parts, grows with current and falling temperature, and is where delivered energy is lost.",
        "unit": "V",
        "related": [
          "overpotential",
          "ir-drop",
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          "open-circuit-voltage",
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      "id": "term:state-of-charge",
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        "related": [
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          "title": "Interpret a charge inventory",
          "text": "If available capacity is 5 Ah and 3 Ah remains by the chosen estimator, SOC is 60%. A different estimate of available capacity changes this percentage, so compare SOC values only with the capacity convention recorded."
        },
        "url": "https://lemonergy.com/learn/glossary/state-of-charge/",
        "mentions": [
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        "readout": "At τ = 20 s, 63.2% of the step response is complete; a relaxation retains 36.8%.",
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          "body": "An analytical RC response explains polarization and relaxation. It is not an identified RC network or a native Studio battery capability.",
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      "id": "reference:inl-ev-tests",
      "type": "Reference",
      "label": "Battery Test Manual For Electric Vehicles, Revision 3",
      "properties": {
        "title": "Battery Test Manual For Electric Vehicles, Revision 3",
        "publisher": "Idaho National Laboratory",
        "url": "https://inldigitallibrary.inl.gov/sites/sti/sti/6492291.pdf",
        "type": "Test manual",
        "scope": "Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.",
        "year": 2015,
        "authors": [
          "Jon P. Christopherson"
        ],
        "accessed": "2026-10-27"
      }
    }
  ]
}
