{ "node": { "id": "term:discharge-curve", "type": "Term", "label": "Discharge curve", "properties": { "id": "discharge-curve", "name": "Discharge curve", "aka": [ "voltage curve" ], "section": "topic-charging", "definition": "The plot of terminal voltage against delivered capacity at a given current and temperature. Its shape identifies the chemistry — LFP is flat, NMC slopes — and its area is the delivered energy.", "related": [ "discharge", "voltage-plateau", "nominal-voltage", "ocv-soc-curve" ], "lesson": "fundamentals/capacity-and-c-rate/#area", "url": "https://lemonergy.com/learn/glossary/discharge-curve/", "mentions": [ "voltage" ] } }, "edges": [ { "id": "edge:144", "source": "term:discharge-curve", "target": "workflow:drive-profile", "type": "usedIn", "properties": { "sourceFile": "wiki-blocks.json" } }, { "id": "edge:1102", "source": "term:discharge-curve", "target": "topic:topic-charging", "type": "belongsTo", "properties": { "sourceFile": "terms.json" } }, { "id": "edge:1103", "source": "term:discharge-curve", "target": "term:discharge", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:1104", "source": "term:discharge-curve", "target": "term:voltage-plateau", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:1105", "source": "term:discharge-curve", "target": "term:nominal-voltage", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:1106", "source": "term:discharge-curve", "target": "term:ocv-soc-curve", "type": "relatedTo", "properties": { "sourceFile": "terms.json", "meaning": "Related context; not a causal claim" } }, { "id": "edge:mentions/discharge-curve/voltage", "source": "term:discharge-curve", "target": "term:voltage", "type": "mentions", "properties": { "sourceFile": "terms.json", "method": "build_glossary.mention_index + mentions", "field": "definition", "meaning": "Text mention; not a causal claim" } }, { "id": "edge:1108", "source": "term:discharge-curve", "target": "lesson:fundamentals/capacity-and-c-rate/", "type": "explainedIn", "properties": { "sourceFile": "terms.json", "url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/#area" } }, { "id": "edge:1109", "source": "term:discharge-curve", "target": "visual:voltage", "type": "illustratedBy", "properties": { "sourceFile": "visual-pages.json" } } ], "neighbors": [ { "id": "workflow:drive-profile", "type": "Workflow", "label": "Replay a changing load", "properties": { "id": "drive-profile", "title": "Replay a changing load", "kind": "protocol", "summary": "Replay applies an existing governed profile.", "steps": [ "Open Drive-cycle replay.", "Inspect profile and scale; compare current and SOC." ], "example": "40 kW at 400 V needs about 100 A before losses; at 350 V it needs about 114 A.", "observe": "Current rises as voltage falls under fixed power.", "limits": "The selected profile determines regeneration. This is not an independent road-load or motor-efficiency model.", "url": "https://design.lemonergy.com/", "label": "Open Design → Protocol bench", "evidence": [ "js/test-protocol.js" ] } }, { "id": "topic:topic-charging", "type": "Topic", "label": "Charging and discharging", "properties": { "id": "topic-charging", "name": "Charging and discharging", "lede": "How current goes in and comes out, and the limits that stop it.", "context": "Separate regulation from availability.", "example": "The same CC–CV law can operate overnight or during a short depot stop.", "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/", "lesson_label": "Open charging quantities" } }, { "id": "term:discharge", "type": "Term", "label": "Discharge", "properties": { "id": "discharge", "name": "Discharge", "aka": [ "discharging" ], "section": "topic-charging", "definition": "Drawing current from a cell: lithium ions leave the negative electrode, cross the electrolyte and enter the positive one, while electrons do work in the external circuit. The voltage falls as the cell empties.", "related": [ "charge", "discharge-curve", "cutoff-voltage", "depth-of-discharge", "load" ], "lesson": "fundamentals/cell-anatomy/#discharge", "url": "https://lemonergy.com/learn/glossary/discharge/", "mentions": [ "electrode", "negative-electrode", "electrolyte" ] } }, { "id": "term:voltage-plateau", "type": "Term", "label": "Voltage plateau", "properties": { "id": "voltage-plateau", "name": "Voltage plateau", "section": "topic-charging", "definition": "A stretch of the voltage curve where voltage barely changes while charge passes, because the electrode is moving between two phases at a fixed potential. LFP has one long plateau; graphite shows several small ones.", "related": [ "discharge-curve", "lfp", "phase-transition", "ocv-soc-curve" ], "url": "https://lemonergy.com/learn/glossary/voltage-plateau/", "mentions": [ "electrode", "graphite" ] } }, { "id": "term:nominal-voltage", "type": "Term", "label": "Nominal voltage", "properties": { "id": "nominal-voltage", "name": "Nominal voltage", "section": "topic-ratings", "definition": "A representative average voltage of a cell over a full discharge, such as 3.6–3.7 V for an oxide/graphite cell or about 3.2 V for LFP/graphite. Multiplied by capacity, it gives nominal energy.", "unit": "V", "related": [ "nominal-energy", "open-circuit-voltage", "voltage-window", "lfp" ], "lesson": "fundamentals/capacity-and-c-rate/#energy", "url": "https://lemonergy.com/learn/glossary/nominal-voltage/", "mentions": [ "graphite" ] } }, { "id": "term:ocv-soc-curve", "type": "Term", "label": "OCV–SOC curve", "properties": { "id": "ocv-soc-curve", "name": "OCV–SOC curve", "section": "topic-state", "definition": "The characteristic relation between a cell’s open-circuit voltage and its state of charge, measured once at low current and stored in the BMS. A steep curve, as for NMC, makes SOC easy to read from voltage; LFP’s flat curve does not.", "related": [ "open-circuit-voltage", "state-of-charge", "coulomb-counting", "lfp", "voltage-plateau", "ocv-test" ], "url": "https://lemonergy.com/learn/glossary/ocv-soc-curve/", "mentions": [ "bms" ] } }, { "id": "term:voltage", "type": "Term", "label": "Voltage", "properties": { "id": "voltage", "name": "Voltage", "aka": [ "terminal voltage" ], "section": "topic-units", "definition": "The potential difference between a cell’s two terminals. It comes from the chemical difference between the electrodes, moves with state of charge, and sags under load because of internal resistance.", "unit": "V", "related": [ "open-circuit-voltage", "nominal-voltage", "internal-resistance", "ir-drop" ], "lesson": "fundamentals/cell-anatomy/#voltage", "url": "https://lemonergy.com/learn/glossary/voltage/", "mentions": [ "state-of-charge" ] } }, { "id": "lesson:fundamentals/capacity-and-c-rate/", "type": "Lesson", "label": "Lesson 2 · Capacity and C-rate", "properties": { "url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/" } }, { "id": "visual:voltage", "type": "Visual", "label": "Voltage under load", "properties": { "title": "Voltage under load", "summary": "Discharge current creates an ohmic drop below open-circuit voltage.", "readout": "5 A through 20 mΩ gives 0.1 V ohmic drop.", "formula": "V_terminal = OCV − I_discharge R", "note": "Chosen OCV curve; no chemistry calibration, hysteresis or voltage cutoff.", "software": { "status": "studio", "label": "Voltage relationship in Studio", "body": "The native battery calculates terminal voltage from OCV and resistance. The curve here is an illustrative OCV relationship, not a fitted cell dataset.", "href": "https://design.lemonergy.com/cosim.html?example=charging-home" }, "html": "
Illustrative OCV and loaded voltage
Illustrative OCV and loaded voltageSOC (%) versus Voltage (V). Open circuit; Under load. Interpretation follows the graphs.1.802.42253.05503.67754.3100SOC (%)Voltage (V)
Open circuitUnder load (dashed)
" } } ] }