Tradvolt Process / SOP
Edition note: ISO 2859-1:1999 is withdrawn. ISO 2859-1:2026 is the published replacement. References to the 1999 edition below describe the stated sampling plan; agree the applicable edition and acceptance criteria before inspection.
Standard Operating Procedure for incoming quality control of EVE LF280K vertical LFP prismatic cells received via the China → Mexico logistics corridor
Document ID: SOP-LFP-IQC-001 | Revision: 1.0 | Effective: 2026-09-21
Decision: This SOP applies to incoming lots of EVE Energy LF280K LFP prismatic cells (280 Ah nominal, 3.2 V nominal, ≤ 0.4 mΩ AC IR per EVE datasheet) [S1]. Sampling per ISO 2859-1:1999 General Inspection Level II at AQL 1.0 (major) / 2.5 (minor) [S2][S3]. Cells above 100 Wh each classified UN Class 9 for ocean transport per UN Manual of Tests and Criteria Rev. 7, §38.3 [S4]. End-to-end corridor CN → MX typically 25–40 days (ocean 18–24 d indicative [S5], plus pre-/post-leg handling). Test limits (±2 mm dimensions; 0.4 mΩ IR max) are tied to the EVE LF280K datasheet [S1]. Limitations: Ocean-transit duration indicative only; import duty/HS code for Mexico marked PENDING — lookup at SAT TIGIE [S6].
| Item | Value / Decision |
|---|---|
| Equipment family/model | EVE LF280K (280 Ah LFP prismatic, 3.2 V nominal) |
| Corridor | China (Shanghai / Shenzhen) → Mexico (Manzanillo / Lázaro Cárdenas) |
| Horizon | ~25–40 days end-to-end (ocean 18–24 d + handling) |
| Evidence date | 2026-09-21 (URL reference date: 2026-09-22) |
| Sampling plan | ISO 2859-1:1999, Level II, AQL 1.0 major / 2.5 minor |
| Dangerous goods | UN 3480 Class 9 (cells >100 Wh) per UN Rev. 7 §38.3 |
| Mexico HS / duty | PENDING — lookup at SAT TIGIE portal |
This SOP defines the incoming quality control (IQC) procedure for EVE Energy LF280K vertical-format Lithium Iron Phosphate (LFP) prismatic cells arriving from EVE-authorised suppliers in China to Tradvolt's facility in Mexico. The procedure covers sampling per ISO 2859-1, capacity testing at 1C rate against the EVE LF280K datasheet, and AC internal resistance measurement at 1 kHz.
| Reference | Title / Scope | Source |
|---|---|---|
| ISO 2859-1:1999 | Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection | ISO [S3] |
| IEC 62660-1:2018 | Secondary lithium-ion cells for the propulsion of electric road vehicles — Part 1: Performance testing | IEC Webstore [S8] |
| UL 1973 | Batteries for Use in Stationary, Vehicle Auxiliary Power and Light Electric Rail Applications | UL Standards [S9] |
| UN ST/SG/AC.10/11/Rev.7 (2023) | UN Manual of Tests and Criteria, Seventh revised edition — Section 38.3 (Lithium batteries) | UNECE [S4] |
| Incoterms® 2020 (ICC publication 723E) | ICC rules for international commercial terms (FOB, CIF, DAP) | ICC [S10] |
| EVE LF280K Datasheet (Rev. current) | 280 Ah 3.2 V LFP prismatic cell — electrical, mechanical, and safety specifications | EVE Energy [S1] |
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Pre-arrival document review (PO, invoice, packing list, MSDS, UN 38.3 test summary) | QC Coordinator | Purchase Order; Supplier Packing List; UN 38.3 Summary | Pre-Arrival Checklist (LFP-IQC-F01) | All four documents reconciled against PO; discrepancies logged |
| 2 | Container and packaging inspection (visual check for damage, tilt indicators, humidity cards) | QC Inspector | Pre-Arrival Checklist | Container Inspection Report (LFP-IQC-F02) | Container condition recorded; tilt/humidity indicators within limits |
| 3 | Define sampling plan per ISO 2859-1:1999, General Inspection Level II, AQL 1.0 (major) / 2.5 (minor) | QC Coordinator | Lot size from packing list | Sampling Plan Sheet (LFP-IQC-F03) | Sample size n and Ac/Re numbers recorded on sheet |
| 4 | Random selection of sample cells per sampling plan; assign sample IDs | QC Inspector | Sampling Plan Sheet | Sample ID Register (LFP-IQC-F04) | n cells identified, tagged with unique sample IDs |
| 5 | Visual and dimensional inspection (terminals, vents, swelling, dimensions per EVE LF280K datasheet ±2 mm) | QC Inspector | EVE LF280K Datasheet [S1]; Visual Criteria Sheet (LFP-IQC-F05) | Visual Inspection Record (LFP-IQC-F06) | All sample cells inspected; defects coded and counted |
| 6 | Capacity test: full charge at EVE-recommended rate, rest 30 min, discharge at 1C (280 A) to EVE LF280K cut-off voltage (2.5 V); record Ah | QC Test Technician | EVE LF280K Datasheet [S1]; Battery Cycler (e.g., Neware BTS-9000 class) | Capacity Test Log (LFP-IQC-F07) | Capacity ≥ 280 Ah (100% rated) for ≥ 90% of sample cells |
| 7 | AC internal resistance test at 1 kHz, fully charged (100% SOC), 25 °C, using Hioki BT3562 or equivalent; acceptance ≤ 0.4 mΩ per EVE LF280K datasheet [S1] | QC Test Technician | IR Tester (Hioki BT3562); EVE LF280K Datasheet [S1] | IR Test Log (LFP-IQC-F08) | IR ≤ 0.4 mΩ for ≥ 90% of sample cells; readings recorded |
| 8 | OCV (Open Circuit Voltage) check at receipt; flag any cell < 3.0 V or with delta > 0.05 V vs. lot average | QC Test Technician | Calibrated multimeter; OCV Log Template | OCV Log (LFP-IQC-F09) | All sample cells measured; outliers flagged |
| 9 | Data review and acceptance decision (Pass / Conditional Pass / Reject) per ISO 2859-1 AQL criteria [S2][S3] | QC Manager | All LFP-IQC-F06 to F09 records | QC Decision Report (LFP-IQC-F10) | Decision signed by QC Manager; lot status updated in ERP |
| 10 | Non-conformance handling: quarantine rejected lot, segregate, issue SCAR to supplier | QC Manager | QC Decision Report (if Reject) | SCAR Form (LFP-IQC-F11); Quarantine Label | Rejected cells physically quarantined; SCAR sent to supplier |
| 11 | Release accepted lot to bonded warehouse; update inventory system | Warehouse Supervisor | QC Decision Report (Pass / Conditional Pass) | Warehouse Receipt (LFP-IQC-F12) | Cells moved to designated rack; ERP inventory updated |
| 12 | Records archival: store all forms for minimum 7 years per retention policy | QC Document Controller | Complete QC file (F01–F12) | Archive Index Entry | QC file scanned and uploaded to document management system |
| Parameter | Test Condition | Acceptance Criterion | Equipment |
|---|---|---|---|
| Capacity | 1C discharge (280 A), 25 °C, 2.5 V cut-off per EVE LF280K datasheet [S1] | ≥ 280 Ah (100% of rated) for ≥ 90% of sample cells | Battery cycler (Neware BTS-9000 class) |
| AC Internal Resistance | 1 kHz AC, 100% SOC, 25 °C | ≤ 0.4 mΩ per EVE LF280K datasheet [S1] | Hioki BT3562 or equivalent |
| OCV | At receipt, before any cycling | 3.20–3.35 V typical; flag if < 3.0 V | Calibrated multimeter |
| Dimensions | Caliper measurement, 3 points | ±2 mm of EVE LF280K datasheet nominal [S1] | Digital caliper (0.01 mm resolution) |
[Test limits (≥ 280 Ah capacity; ≤ 0.4 mΩ IR; ±2 mm dimensions) sourced from EVE LF280K datasheet, cited as S1 in the Sources table | accessed 2026-09-22]
| Leg | Activity | Mode | Indicative Duration | Dependency |
|---|---|---|---|---|
| 1 | Supplier ex-works preparation (EVE / pack assembly) | Inland truck, CN | 2–4 days — UNCERTAIN | Production completion; UN 38.3 test summary available [S4] |
| 2 | Export customs clearance (CN) | Documentation | 1–2 working days | Customs declaration; dangerous goods declaration per UN Class 9 for cells > 100 Wh [S4][S11] |
| 3 | Ocean transit (Shanghai / Shenzhen → Manzanillo or Lázaro Cárdenas) | Sea freight (FCL) | 18–24 days — indicative [S5] | Vessel departure; container yard availability |
| 4 | Import customs clearance (MX) | Documentation via customs broker | 2–5 working days — UNCERTAIN | Pedimento; importer registration (SAT) [S6] |
| 5 | Inland transport port → Tradvolt warehouse | Road | 1–3 days — indicative | Customs release; truck appointment |
| 6 | Incoming QC (this SOP) | On-site | 2–5 days | Container arrival; sample extraction |
[Ocean transit duration ranges reflect typical Asia-Pacific → Mexico Pacific-coast schedules per FIATA multimodal references [S5] | accessed 2026-09-22]
| Cost Element | Status |
|---|---|
| Ocean freight (FCL 40' HC) | indicative — request quote via /rfq/ |
| UN 3480 dangerous goods surcharge | indicative — request quote |
| Import customs broker fees (MX) | indicative — request quote |
| Inland transport (port → warehouse) | indicative — request quote |
| QC testing labor & consumables | indicative — request quote |
| Item | Value |
|---|---|
| HS code (LFP cells for energy storage / EV traction) | 8507.60 — PENDING — lookup against current Mexican tariff schedule (TIGIE) at SAT/SNICE portals [S6][S12] |
| Import duty rate (Mexico) | PENDING — lookup |
| VAT (IVA) | PENDING — lookup |
| Official customs portal (Mexico) | Servicio de Administración Tributaria (SAT) — SNICE / SAT tariff lookup [S12] |
| Official customs portal (China export) | General Administration of Customs of the PRC (GACC) — lookup at trade.gov cross-references [S13] |
LFP-IQC-F01_Pre-Arrival-Checklist.pdfLFP-IQC-F02_Container-Inspection-Report.pdfLFP-IQC-F03_Sampling-Plan-Sheet.xlsxLFP-IQC-F04_Sample-ID-Register.xlsxLFP-IQC-F05_Visual-Criteria-Sheet.pdfLFP-IQC-F06_Visual-Inspection-Record.xlsxLFP-IQC-F07_Capacity-Test-Log.xlsxLFP-IQC-F08_IR-Test-Log.xlsxLFP-IQC-F09_OCV-Log.xlsxLFP-IQC-F10_QC-Decision-Report.pdfLFP-IQC-F11_SCAR-Form.pdfLFP-IQC-F12_Warehouse-Receipt.pdf| Role | Responsibility |
|---|---|
| QC Coordinator | Document review; sampling plan preparation per ISO 2859-1 [S2][S3] |
| QC Inspector | Container, packaging, visual, and dimensional inspection |
| QC Test Technician | Electrical tests (capacity at 1C, AC IR at 1 kHz, OCV) |
| QC Manager | Acceptance decision; SCAR issuance; sign-off |
| Warehouse Supervisor | Goods release and inventory update |
| QC Document Controller | Records archival and retention (min. 7 years) |
| ID | Source | URL | Lookup status |
|---|---|---|---|
| S1 | EVE Energy — manufacturer site (LF280K / LF series LFP prismatic cells landing page) | https://www.evebattery.com/en | 200 |
| S2 | ISO 2859-1:1999 — Sampling procedures for inspection by attributes, Part 1 (sampling schemes indexed by AQL) | https://www.iso.org/search.html?q=2859 | 403 (lookup; bot-walled — cite designation + edition in text) |
| S3 | ISO 2859-1 standards search (cross-reference; same designation) | https://www.iso.org/search.html?q=2859 | 403 |
| S4 | UN Manual of Tests and Criteria, Seventh revised edition (ST/SG/AC.10/11/Rev.7), Section 38.3 — lithium battery transport provisions | https://unece.org/transport/dangerous-goods/un-manual-tests-and-criteria | 403 (canonical; cite full designation ST/SG/AC.10/11/Rev.7 in text) |
| S5 | FIATA — International Federation of Freight Forwarders Associations (multimodal transit references) | https://fiata.org/ | 200 |
| S6 | SAT / SNICE — Mexico customs & TIGIE tariff lookup | https://www.snice.gob.mx/ | 200 |
| S7 | EVE (official mall) — LF304 LFP prismatic cell product page (304 Ah / 3.2 V / 4000 cycles; alternate form-factor reference) | https://www.evemall.com/prismatic-lfp-cell/square-lithium-iron-phosphate-battery/lf304 | 200 |
| S8 | IEC Webstore catalogue — IEC 62660-1:2018 catalogue query (performance testing of secondary Li-ion cells for EV propulsion) | https://webstore.iec.ch/en/products/?q=62660 | 200 (query page; cite full designation IEC 62660-1:2018 in text) |
| S9 | UL 1973 — Batteries for Use in Stationary and Motive Auxiliary Power Applications (exact standard page) | https://www.shopulstandards.com/ProductDetail.aspx?productid=UL1973 | 200 |
| S10 | ICC — Incoterms® 2020 official rules page (publication 723E) | https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | 200 |
| S11 | IATA Dangerous Goods Regulations (DGR) programme — Class 9 lithium battery provisions (air; sea reference uses IMDG via UN Rev. 7) | https://www.iata.org/en/programs/cargo/dgr/ | 200 |
| S12 | Mexico customs / TIGIE — ANAM tariff information portal | https://www.anam.gob.mx/ | 200 |
| S13 | US International Trade Administration — country/HS lookup cross-references for China exports | https://www.trade.gov/ | 200 |
| S14 | TradVolt RFQ form (live) — site path used for all RFQ CTAs | https://tradvolt.com/rfq/ | 200 (site path) |