36 lines
1.9 KiB
JSON
36 lines
1.9 KiB
JSON
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{
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"title": "Reading Battery State-of-Health — Field Guide",
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"author": "Adam Pollard",
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"author_id": "adam-pollard",
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"seo": "adam-pollard",
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"url": "/soh.html",
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"description": "How an ASE tech judges a hybrid pack without trusting the dashboard: module voltage spread, internal-resistance rise, capacity fade.",
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"domain": "hybrid_traction_pack_diagnostics",
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"method": "verify power, verify ground, then trace signal path",
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"metrics": {
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"module_voltage_spread": { "unit": "mV", "healthy_max": 10, "watch_min": 25, "watch_max": 50, "fail_min": 50, "note": "spread at rest, ~20% SOC" },
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"internal_resistance_rise": { "unit": "percent", "healthy_max": 10, "watch_min": 20, "watch_max": 40, "fail_min": 40, "note": "accept across full pack; per-module above band writes up" },
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"capacity_fade": { "unit": "percent_of_rated", "healthy_min": 90, "watch_min": 80, "fail_max": 80, "note": "fleet policy and warranty SOH threshold override" }
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},
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"patent_fault_patterns": [
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"single_high_ir_module -> replace module",
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"uniform_ir_rise_and_fade -> schedule pack replacement",
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"cell_spike_at_low_soc -> lithium plating risk, remove now",
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"spread_tightens_under_load -> connector/contact resistance, not cell"
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],
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"schedule": {
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"capacity_check": "full discharge at nominal C-rate, amp-hours out; slow test",
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"rest_period": "minimum 1 hour at ~20% SOC before reading"
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},
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"grounding": {
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"chemistry_baseline": "https://www.wikidata.org/wiki/Q2822895",
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"note": "thresholds are field-work bands, not manufacturer spec"
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},
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"safety": [
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"class-0 insulated gloves before any orange connector",
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"disconnect and wait for capacitor discharge",
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"megohmmeter isolation test, not continuity beep",
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"one hand in pocket near pack"
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],
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"related": [ { "title": "Shop index", "url": "/index.html" }, { "title": "Hybrid diagnostic tree", "url": "/tool.html" } ]
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}
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