{
  "node": {
    "id": "term:ccu",
    "type": "Term",
    "label": "Charging control unit",
    "properties": {
      "id": "ccu",
      "name": "Charging control unit",
      "abbr": "CCU",
      "aka": [
        "charge control unit"
      ],
      "section": "topic-data",
      "definition": "The vehicle-side controller that manages charging: it detects the plug, talks to the charging station over the control pilot or ISO 15118 and DIN 70121, and passes the current and voltage limits the BMS allows. In some bus and truck architectures CCU also names a central or cluster control unit, so the system diagram decides.",
      "related": [
        "evcc",
        "iso-15118",
        "din-70121",
        "bms",
        "onboard-charger",
        "pantograph-charging"
      ],
      "url": "https://lemonergy.com/learn/glossary/ccu/",
      "mentions": [
        "control-pilot",
        "evse"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:4005",
      "source": "term:ccu",
      "target": "topic:topic-data",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:4006",
      "source": "term:ccu",
      "target": "term:evcc",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4007",
      "source": "term:ccu",
      "target": "term:iso-15118",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4008",
      "source": "term:ccu",
      "target": "term:din-70121",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4009",
      "source": "term:ccu",
      "target": "term:bms",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4010",
      "source": "term:ccu",
      "target": "term:onboard-charger",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4011",
      "source": "term:ccu",
      "target": "term:pantograph-charging",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/ccu/control-pilot",
      "source": "term:ccu",
      "target": "term:control-pilot",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/ccu/evse",
      "source": "term:ccu",
      "target": "term:evse",
      "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-data",
      "type": "Topic",
      "label": "Data, communication and electronics",
      "properties": {
        "id": "topic-data",
        "name": "Data, communication and electronics",
        "lede": "The control units, chips, protocols and file formats through which a battery is measured, controlled and logged.",
        "context": "Separate quantities from encoding and transport.",
        "example": "2500 in a log might mean 25.00 °C, 2.5 V or raw counts. Units and scale must accompany the value.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-basics/",
        "lesson_label": "Open battery basics"
      }
    },
    {
      "id": "term:evcc",
      "type": "Term",
      "label": "EVCC and SECC",
      "properties": {
        "id": "evcc",
        "name": "EVCC and SECC",
        "aka": [
          "electric vehicle communication controller",
          "supply equipment communication controller"
        ],
        "section": "topic-infrastructure",
        "definition": "The two ends of high-level charging communication: the electric vehicle communication controller in the vehicle and the supply equipment communication controller in the charger. They exchange limits, schedules and authorisation over power-line communication on the control-pilot wire.",
        "related": [
          "ccu",
          "iso-15118",
          "din-70121",
          "plc-green-phy",
          "dc-fast-charging"
        ],
        "url": "https://lemonergy.com/learn/glossary/evcc/",
        "mentions": [
          "charger",
          "electric-vehicle"
        ]
      }
    },
    {
      "id": "term:iso-15118",
      "type": "Term",
      "label": "ISO 15118",
      "properties": {
        "id": "iso-15118",
        "name": "ISO 15118",
        "aka": [
          "Plug & Charge",
          "V2G communication"
        ],
        "section": "topic-infrastructure",
        "definition": "The communication standard between an electric vehicle and a charging station: identification, authorisation, charge scheduling and, in the −20 edition, bidirectional power transfer. It is what lets a car authenticate itself and start charging with no card or app.",
        "related": [
          "dc-fast-charging",
          "vehicle-to-grid",
          "iso-17409",
          "can-bus",
          "evcc",
          "din-70121"
        ],
        "url": "https://lemonergy.com/learn/glossary/iso-15118/",
        "mentions": [
          "electric-vehicle",
          "evse",
          "vehicle-to-everything"
        ]
      }
    },
    {
      "id": "term:din-70121",
      "type": "Term",
      "label": "DIN 70121",
      "properties": {
        "id": "din-70121",
        "name": "DIN 70121",
        "aka": [
          "DIN SPEC 70121"
        ],
        "section": "topic-infrastructure",
        "definition": "The German specification for the digital communication between an electric vehicle and a DC charger in the Combined Charging System, the forerunner of ISO 15118. Most DC chargers in Europe still speak it, so vehicles support both.",
        "related": [
          "iso-15118",
          "evcc",
          "ccu",
          "plc-green-phy",
          "sae-j1772"
        ],
        "url": "https://lemonergy.com/learn/glossary/din-70121/",
        "mentions": [
          "charger",
          "electric-vehicle"
        ]
      }
    },
    {
      "id": "term:bms",
      "type": "Term",
      "label": "Battery management system",
      "properties": {
        "id": "bms",
        "name": "Battery management system",
        "abbr": "BMS",
        "section": "topic-pack",
        "definition": "The electronics and software that keep a battery inside its safe window: measuring every cell voltage and many temperatures, estimating SOC and SOH, balancing cells, computing current limits, controlling the contactors and reporting over the vehicle network.",
        "related": [
          "state-of-charge",
          "cell-balancing",
          "state-of-power",
          "cell-supervision-circuit",
          "contactor",
          "can-bus"
        ],
        "lesson": "fundamentals/battery-basics/#cell-module-pack",
        "url": "https://lemonergy.com/learn/glossary/bms/",
        "mentions": [
          "state-of-health",
          "cell-voltage"
        ]
      }
    },
    {
      "id": "term:onboard-charger",
      "type": "Term",
      "label": "Onboard charger",
      "properties": {
        "id": "onboard-charger",
        "name": "Onboard charger",
        "abbr": "OBC",
        "section": "topic-infrastructure",
        "definition": "The converter inside the vehicle that turns AC from a home or public socket into DC for the pack, typically rated 7–22 kW. DC fast chargers bypass it, which is why they can be so much more powerful.",
        "related": [
          "charger",
          "dc-fast-charging",
          "cc-cv-charging",
          "un-r10",
          "slow-charging"
        ],
        "url": "https://lemonergy.com/learn/glossary/onboard-charger/",
        "mentions": []
      }
    },
    {
      "id": "term:pantograph-charging",
      "type": "Term",
      "label": "Pantograph charging",
      "properties": {
        "id": "pantograph-charging",
        "name": "Pantograph charging",
        "aka": [
          "OppCharge",
          "SAE J3105"
        ],
        "section": "topic-infrastructure",
        "definition": "Fast charging of a bus through an automatic contact on the roof — raised from the vehicle or lowered from a mast — at the terminus or en route, at 150–600 kW for a few minutes. It allows a smaller battery at the price of high-rate cycling and more infrastructure.",
        "related": [
          "electric-bus",
          "depot-charging",
          "fast-charging",
          "vdv-261",
          "charge-acceptance",
          "opportunity-charging"
        ],
        "url": "https://lemonergy.com/learn/glossary/pantograph-charging/",
        "mentions": []
      }
    },
    {
      "id": "term:control-pilot",
      "type": "Term",
      "label": "Control pilot",
      "properties": {
        "id": "control-pilot",
        "name": "Control pilot",
        "abbr": "CP",
        "aka": [
          "proximity pilot",
          "PP"
        ],
        "section": "topic-infrastructure",
        "definition": "The signal wire in an AC or CCS charging connector: the charger puts a ±12 V square wave on it whose duty cycle tells the vehicle the maximum current, and the vehicle answers by switching resistors. The proximity pilot beside it tells the vehicle a plug is inserted.",
        "related": [
          "sae-j1772",
          "plc-green-phy",
          "ccu",
          "onboard-charger"
        ],
        "url": "https://lemonergy.com/learn/glossary/control-pilot/",
        "mentions": [
          "charger"
        ]
      }
    },
    {
      "id": "term:evse",
      "type": "Term",
      "label": "Electric vehicle supply equipment",
      "properties": {
        "id": "evse",
        "name": "Electric vehicle supply equipment",
        "abbr": "EVSE",
        "aka": [
          "charging station",
          "charge point",
          "wallbox"
        ],
        "section": "topic-infrastructure",
        "definition": "The charging equipment between the grid and the vehicle: an AC wallbox that only switches and protects the supply, or a DC charger that also converts it. It enforces the current limit, ground-fault protection and communication with the vehicle.",
        "related": [
          "charging-modes",
          "dc-fast-charging",
          "control-pilot",
          "ocpp",
          "evcc"
        ],
        "url": "https://lemonergy.com/learn/glossary/evse/",
        "mentions": [
          "charger"
        ]
      }
    }
  ]
}