{
  "node": {
    "id": "term:halt-hass",
    "type": "Term",
    "label": "HALT and HASS",
    "properties": {
      "id": "halt-hass",
      "name": "HALT and HASS",
      "aka": [
        "highly accelerated life test",
        "highly accelerated stress screen",
        "HALT",
        "HASS"
      ],
      "section": "topic-testing",
      "definition": "Two step-stress methods for electronics. HALT pushes prototypes through rising temperature, rapid thermal cycling and multi-axis vibration far beyond specification to find weak points and margins; HASS applies a gentler, proven fraction of those stresses to production units to catch manufacturing defects. Battery packs use them for BMS boards, connectors and solder joints.",
      "related": [
        "vibration-test",
        "thermal-shock-test",
        "fmea",
        "end-of-line-testing",
        "mil-std-810"
      ],
      "url": "https://lemonergy.com/learn/glossary/halt-hass/",
      "mentions": [
        "bms"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:belongsTo/term:halt-hass/topic:topic-testing",
      "source": "term:halt-hass",
      "target": "topic:topic-testing",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:relatedTo/term:halt-hass/term:vibration-test",
      "source": "term:halt-hass",
      "target": "term:vibration-test",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:halt-hass/term:thermal-shock-test",
      "source": "term:halt-hass",
      "target": "term:thermal-shock-test",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:halt-hass/term:fmea",
      "source": "term:halt-hass",
      "target": "term:fmea",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:halt-hass/term:end-of-line-testing",
      "source": "term:halt-hass",
      "target": "term:end-of-line-testing",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:relatedTo/term:halt-hass/term:mil-std-810",
      "source": "term:halt-hass",
      "target": "term:mil-std-810",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/halt-hass/bms",
      "source": "term:halt-hass",
      "target": "term:bms",
      "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-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:vibration-test",
      "type": "Term",
      "label": "Vibration and shock test",
      "properties": {
        "id": "vibration-test",
        "name": "Vibration and shock test",
        "section": "topic-testing",
        "definition": "Shaking a cell or pack on a vibration table to a profile standing for years of road use, and striking it with defined mechanical shocks, then checking for loose connections, leaks and loss of isolation. UN 38.3, R100 and ISO 12405 each specify a profile.",
        "related": [
          "transport-regulations",
          "un-r100-part-2",
          "iso-12405",
          "abuse-testing",
          "thermal-shock-test",
          "power-spectral-density"
        ],
        "url": "https://lemonergy.com/learn/glossary/vibration-test/",
        "mentions": [
          "un-r100"
        ]
      }
    },
    {
      "id": "term:thermal-shock-test",
      "type": "Term",
      "label": "Thermal shock and cycling test",
      "properties": {
        "id": "thermal-shock-test",
        "name": "Thermal shock and cycling test",
        "section": "topic-testing",
        "definition": "Moving a cell or pack rapidly between temperature extremes, typically −40 °C and +60 to +85 °C, for many cycles, to find seals, welds and housings that fail by differential expansion. It is in UN 38.3, R100 and most pack specifications.",
        "related": [
          "transport-regulations",
          "un-r100-part-2",
          "vibration-test",
          "abuse-testing",
          "mil-std-810"
        ],
        "url": "https://lemonergy.com/learn/glossary/thermal-shock-test/",
        "mentions": [
          "un-r100"
        ]
      }
    },
    {
      "id": "term:fmea",
      "type": "Term",
      "label": "Failure mode and effects analysis",
      "properties": {
        "id": "fmea",
        "name": "Failure mode and effects analysis",
        "abbr": "FMEA",
        "aka": [
          "DFMEA",
          "PFMEA",
          "design FMEA",
          "process FMEA"
        ],
        "section": "topic-hvsafety",
        "definition": "A structured review that lists every way a component or process could fail, its effect, and how likely it is to happen and be detected, scoring each to prioritise fixes. Battery programmes run it on the cell, the pack design and the production process.",
        "related": [
          "functional-safety",
          "abuse-testing",
          "cell-design",
          "fault-tree-analysis",
          "halt-hass"
        ],
        "url": "https://lemonergy.com/learn/glossary/fmea/",
        "mentions": []
      }
    },
    {
      "id": "term:end-of-line-testing",
      "type": "Term",
      "label": "End-of-line testing",
      "properties": {
        "id": "end-of-line-testing",
        "name": "End-of-line testing",
        "abbr": "EOL test",
        "section": "topic-manufacturing",
        "definition": "The final measurements on every finished cell — capacity, internal resistance and open-circuit voltage — used to reject faulty cells and sort good ones into matched grades.",
        "related": [
          "grading",
          "capacity-test",
          "k-value",
          "cell-finishing"
        ],
        "lesson": "fundamentals/cell-production/#finishing",
        "url": "https://lemonergy.com/learn/glossary/end-of-line-testing/",
        "mentions": [
          "internal-resistance",
          "open-circuit-voltage"
        ]
      }
    },
    {
      "id": "term:mil-std-810",
      "type": "Term",
      "label": "MIL-STD-810",
      "properties": {
        "id": "mil-std-810",
        "name": "MIL-STD-810",
        "aka": [
          "MIL-STD-810H",
          "military environmental testing"
        ],
        "section": "topic-standards-stationary",
        "definition": "The US Department of Defense test-method standard for how equipment survives its environment — altitude, heat, cold, humidity, salt fog, sand, rain, shock, vibration and more — with each test tailored to the life the item will see. The current revision is H of 2019 with Change 1 of 2022; rugged electronics and military battery packs cite it.",
        "related": [
          "vibration-test",
          "thermal-shock-test",
          "altitude-simulation-test",
          "abuse-testing"
        ],
        "url": "https://lemonergy.com/learn/glossary/mil-std-810/",
        "mentions": []
      }
    },
    {
      "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"
        ]
      }
    }
  ]
}