SOC

Articles, guides, and products tagged "SOC" — a combined view of every catalogue resource on this topic.

User guide

E-scooter thermal-management engineering: IEC 62133-2:2017 § 7.3 thermal abuse, UL 2272:2024 § 21 abnormal-charging + thermal abuse, ISO 12405-4:2018 PEV battery thermal characterization, JEDEC JESD51-1/-2A/-7 R_θJC measurement, IPC-2221A § 6.2 PCB conductor temperature rise, IEC 60068-2-14:2009 thermal cycle Test Na/Nb, IEC 60068-2-30:2005 humidity cyclic Db, ISO 16750-4:2010 thermal/mechanical environmental conditions, MOSFET junction-temperature limit T_J_max 150-175 °C with R_θJC 0.3-2 °C/W (Infineon IPP/IPB series, Onsemi NTMFS, ST STH240N10F7-6), Arrhenius doubling rule (every +10 °C halves component life of NMC/LFP cells), BMS thermal fold-back when T_cell > 45-50 °C (charge cut-off / discharge derate), hub-motor stator copper I²R loss = I² × R_Cu(T) with temperature coefficient α_Cu = 3.93×10⁻³/°C + iron eddy loss P_eddy ∝ B² × f² × t² (Steinmetz), thermal time constant τ_th = R_th × C_th (continuous-vs-peak power derating motor 5-30 s peak / continuous 30-300 s steady-state), TIM (thermal interface materials): Bergquist Gap Pad k=1.5-6 W/(m·K), Arctic MX-6 grease k=8.5 W/(m·K), PCM Honeywell PTM7950 k=8.5 W/(m·K), cooling topologies (natural convection h_nat 5-25 W/(m²·K) / forced air h_forced 25-250 W/(m²·K) / liquid cold-plate h_liquid 500-20 000 W/(m²·K)), thermal-runaway propagation in 18650/21700 cells (T_onset 130-150 °C NMC, 180-200 °C LFP — LFP significantly safer per CPSC + UL data), CPSC recalls (hoverboards 2016 — 501 000 units recalled for thermal runaway, Lime Gen 2 2018 19.2-Wh packs thermal events, Bird Two 2018 charging thermal incidents)

Engineering deep-dive into e-scooter thermal management as a cross-cutting infrastructure axis — parallel to [fastener engineering as joining axis](@/guide/fastener-and-bolted-joint-engineering.md), [bearing engineering as rotation axis](@/guide/bearing-engineering-iso-281-l10-life.md), and [IP engineering as sealing axis](@/guide/ingress-protection-engineering-iec-60529.md). Covers: 8-row standards matrix (IEC 62133-2:2017, UL 2272:2024, ISO 12405-4:2018, JEDEC JESD51-1/-2A/-7, IPC-2221A, IEC 60068-2-14, IEC 60068-2-30, ISO 16750-4); 6-row component temperature-limit matrix (Li-ion cell, MOSFET T_J_max, NTC thermistor, electrolytic cap ESR/lifetime, hall sensor, BLDC stator winding insulation Class B/F/H 130/155/180 °C); 5-row heat-source matrix (motor I²R + iron loss / controller switching + conduction / battery I²R + polarization / charger SMPS / brake regen); MOSFET R_θJC junction-temperature methodology + derating; battery thermal management (BMS fold-back, Arrhenius +10 °C aging doubling, NMC vs LFP runaway onset 130-150 vs 180-200 °C); hub-motor stator copper-loss formula P_Cu = I² × R_Cu × [1 + α_Cu × (T-25)] + Steinmetz iron-loss P_iron = k × B^β × f^α; thermal time constants τ_th + continuous-vs-peak derating curve; TIM selection (Bergquist Gap Pad / Arctic MX-6 / Honeywell PTM7950 PCM); 3 cooling topologies (natural convection 5-25 W/(m²·K) / forced air 25-250 / liquid cold-plate 500-20 000); Arrhenius doubling rule + IEC 60068-2-14 Test Na/Nb thermal cycle; 6-row failure-diagnostic matrix (cell venting + smoke / MOSFET solder reflow / NTC drift / electrolytic-cap bulge / hall-sensor drift / winding insulation breakdown); 8-step DIY thermal check; 6-step DIY remediation; 3 CPSC case studies (hoverboards CPSC-16-184 501 000 unit 2016, Lime Gen 2 thermal events 2018, Bird Two charging thermal 2018); 17 numbered sections.

16 min read

User guide

Scooter lithium-ion battery lifecycle and recycling engineering: cross-cutting sustainability axis — EU Battery Regulation 2023/1542 (Battery Passport DPP + recycled content + due diligence + carbon footprint declaration) + WEEE Directive 2012/19/EU + UN ST/SG/AC.10/11/Rev.7 Manual of Tests and Criteria 38.3 (T.1-T.8 transport) + IEC 62902:2019 marking + ISO 12405-4:2018 state-of-health + IEC 62660-3:2022 abuse tolerance + ISO 14040:2006/14044:2006 LCA + EN 15804:2012+A2:2019 EPD + hydrometallurgical/pyrometallurgical/direct recycling processes + second-life ESS applications

Engineering deep-dive into the lifecycle and recycling of e-scooter lithium-ion batteries as the seventh cross-cutting infrastructure axis (sustainability axis), parallel to [fastener engineering as joining axis](@/guide/fastener-and-bolted-joint-engineering.md), [thermal management as heat-dissipation axis](@/guide/thermal-management-engineering.md), [EMC/EMI as interference-mitigation axis](@/guide/emc-emi-engineering.md), [cybersecurity as interconnect-trust axis](@/guide/cybersecurity-engineering.md), [NVH as acoustic-vibration-emission axis](@/guide/nvh-engineering.md), and [functional safety as safety-integrity axis](@/guide/functional-safety-engineering.md). Covers: 10-row regulatory matrix (EU Battery Reg 2023/1542, WEEE 2012/19/EU, UN 38.3, IEC 62902, ISO 12405-4, IEC 62660-3, ISO 14040/14044, EN 15804, Basel Convention, EPR schemes); EU Battery Regulation phased timeline 2024-2031; Battery Passport (DPP) data points per Annex XIII; recycled content targets 2031 and 2036; due diligence on Co/Li/Ni/natural graphite per Annex X; carbon footprint declaration per PEFCR; LMT collection rates 51% by 2028 / 61% by 2031; UN 38.3 T.1-T.8 transport tests; SoH assessment per ISO 12405-4; 4-row recycling process comparison (pyro vs hydro vs direct vs mechanical); material recovery Annex XII (Co 90→95%, Li 50→80%, Ni 90→95%); 6-row second-life matrix (home ESS, peak shaving, EV charging buffer, off-grid solar, frequency regulation, streetlight reserve); 4-row recyclers timeline (Umicore, Northvolt Revolt, Li-Cycle, Redwood Materials); 8-step DIY end-of-life check; 6-step DIY pre-recycle prep; industry shift 2020→2026; 16 numbered sections.

17 min read

User guide

Lithium-ion e-scooter battery engineering: electrochemistry, BMS, thermal runaway, safety standards and life cycle

Engineering deep-dive into lithium-ion batteries — paralleling the behavioural «Charging and battery care» guide: intercalation physics and why graphite-LiCoO₂ yields a 3.7 V nominal cell, while LFP gives 3.2 V; why NMC delivers 200–250 Wh/kg vs. 90–160 in LFP; 18650 / 21700 / 26650 / pouch / prismatic formats — geometry, Wh/L density, heat dissipation; full BMS architecture — protection MOSFETs, passive vs. active balancing, coulomb-counting vs. Kalman SoC estimation, CAN/UART/SMBus telemetry; thermal runaway physics — Arrhenius kinetics, SEI decomposition at 80 °C, separator melt at 130 °C, cathode breakdown at 200 °C, exothermic cascade, propagation prevention through cell spacing and ceramic separator; complete comparative matrix of safety standards — UL 2271 (light EV battery pack), UL 2272 (e-scooter system), UL 2849 (e-bike system), EN 50604-1 (Europe LEV), EN 17128 (Europe PLEV), IEC 62133-2 (cell-level), UN 38.3 (transport — 8 tests from altitude through vibration), UN R136 (type approval); life-cycle physics — cycle aging (DoD effect, capacity fade vs. internal resistance growth), calendar aging (Arrhenius), end-of-life criteria (80% SoH industry threshold); series-parallel voltage topology 10S2P → 13S3P → 16S4P and why 36/48/52/60/72 V became standard.

16 min read

User guide

Battery Charging Rules and Care: 20–80 % Window, BMS Temperature, Smart Chargers, Where and How to Charge

Why charging is one of the two biggest sources of e-scooter problems (alongside crashes): dendrites below 0 °C permanently destroy capacity (Battery University BU-410), full charging keeps a pack to only 80 % of its life vs 200 % with a 25–80 % window (BU-808), storage at 100 % SoC at room temperature gives ~80 % after a year vs ~96 % at 40 % SoC (BU-702). FDNY 2024 records 277 fires and 6 deaths in New York (67 % drop in fatalities after NYC Local Law 39 requiring UL 2271/2272/2849). Specific figures from Xiaomi 6 Max (5–40 °C charging) and 6 Ultra (8–40 °C), Segway-Ninebot (Max G30: 'over 50 °F / 10 °C'), Apollo Charging Best Practices (20–80 % daily, 50–70 % storage, top-up every 1–2 months), smart chargers with 80 / 90 / 100 % cutoff (Apollo / NAMI / Dualtron / Fluid FreeRide), five steps UK OPSS, FDNY protocol 'not in bedroom, not on couch, not near exits'.

13 min read