{
  "node": {
    "id": "term:tabless-design",
    "type": "Term",
    "label": "Tabless design",
    "properties": {
      "id": "tabless-design",
      "name": "Tabless design",
      "aka": [
        "full-tab",
        "shingled tab"
      ],
      "section": "topic-chemistries",
      "definition": "A cylindrical-cell construction in which the whole uncoated edge of each foil is folded and welded to the end cap instead of one or two narrow tabs. The current path shortens from metres to millimetres, cutting resistance and heating in large-format cells.",
      "related": [
        "tab",
        "cylindrical-cell",
        "internal-resistance",
        "tab-welding"
      ],
      "url": "https://lemonergy.com/learn/glossary/tabless-design/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:824",
      "source": "term:tabless-design",
      "target": "topic:topic-chemistries",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:825",
      "source": "term:tabless-design",
      "target": "term:tab",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:826",
      "source": "term:tabless-design",
      "target": "term:cylindrical-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:827",
      "source": "term:tabless-design",
      "target": "term:internal-resistance",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:828",
      "source": "term:tabless-design",
      "target": "term:tab-welding",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-chemistries",
      "type": "Topic",
      "label": "Lithium-ion chemistries and cell formats",
      "properties": {
        "id": "topic-chemistries",
        "name": "Lithium-ion chemistries and cell formats",
        "lede": "The electrode materials that define a lithium-ion cell, the crystal structures behind them, and the shapes cells are built in.",
        "context": "Separate chemistry from form factor.",
        "example": "Two cylindrical cells can share dimensions yet differ in cathode, capacity and current limits.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-architecture/",
        "lesson_label": "Open cell architecture"
      }
    },
    {
      "id": "term:tab",
      "type": "Term",
      "label": "Tab",
      "properties": {
        "id": "tab",
        "name": "Tab",
        "section": "topic-components",
        "definition": "The strip of metal that connects an electrode’s foil to the cell terminal: nickel or copper on the negative side, aluminium on the positive. Tab count and width set much of a cell’s resistance and heat generation.",
        "related": [
          "current-collector",
          "tab-welding",
          "tabless-design",
          "terminal"
        ],
        "example": {
          "title": "Electrical and thermal paths",
          "text": "Tab geometry can change electrical resistance and heat flow without changing active-material capacity."
        },
        "url": "https://lemonergy.com/learn/glossary/tab/",
        "mentions": [
          "electrode",
          "heat-generation"
        ]
      }
    },
    {
      "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:internal-resistance",
      "type": "Term",
      "label": "Internal resistance",
      "properties": {
        "id": "internal-resistance",
        "name": "Internal resistance",
        "abbr": "IR",
        "aka": [
          "DC resistance",
          "DCIR"
        ],
        "section": "topic-units",
        "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.",
        "unit": "mΩ",
        "related": [
          "ohms-law",
          "ir-drop",
          "impedance-rise",
          "dcir",
          "area-specific-resistance",
          "resistance-capacity-product"
        ],
        "lesson": "fundamentals/battery-basics/#datasheet",
        "url": "https://lemonergy.com/learn/glossary/internal-resistance/",
        "mentions": [
          "electrolyte",
          "cylindrical-cell"
        ]
      }
    },
    {
      "id": "term:tab-welding",
      "type": "Term",
      "label": "Tab welding",
      "properties": {
        "id": "tab-welding",
        "name": "Tab welding",
        "section": "topic-manufacturing",
        "definition": "Joining the bundle of foil tabs to the terminal tab, usually by ultrasonic welding, which bonds thin foils without melting them; laser welding is used for can-to-cap and busbar joints. A weak weld raises resistance and can fail in service.",
        "related": [
          "tab",
          "ultrasonic-welding",
          "laser-welding",
          "internal-resistance",
          "tab-pull-test"
        ],
        "lesson": "fundamentals/cell-production/#assembly",
        "url": "https://lemonergy.com/learn/glossary/tab-welding/",
        "mentions": [
          "busbar"
        ]
      }
    }
  ]
}