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Specific Current (A/kg):
1,125 A/kg Cont. / 2,250 A/kg Pulse

Continuous Power:
3,375 W/kg (40C / 72.0 A Continuous)

All-Climate Operation:
−40°C to +60°C (≥80% Cap. @ −40°C)

Safety & Impedance:
0V Safe (≥99% Rec.) • ≤3.0 mΩ (1kHz)

1. Scientific Overview & Polyanionic NFPP High-Power Benchmark

The ATOMFAIR® 135070-3.0V-1.8Ah-I (Series SEHEY-1.8Ah) is an industrial-grade, ultra-high-rate polyanionic sodium-iron pyrophosphate-phosphate (NFPP, Na₄Fe₃(PO₄)₂(P₂O₇)) prismatic pouch cell engineered for heavy-duty pulse discharge, cold-cranking starters, hybrid energy storage buffers, and extreme sub-zero applications. Built with an open 3D polyanionic framework cathode, an optimized high-rate hard-carbon anode, and an ultra-low-viscosity sodium electrolyte, the cell delivers an internal AC impedance of ≤ 3.0 mΩ (1 kHz) within a compact 64 ± 5 g footprint.

By minimizing ohmic overpotentials and mass-transport limitations, this 1.8 Ah (5.4 Wh) cell sets an extraordinary power benchmark for chemical batteries: an exceptional continuous specific current of 1,125 A/kg (40C / 72.0 A), an instantaneous 3-second pulse specific current of 2,250 A/kg (80C / 144.0 A), and a continuous gravimetric power density of 3,375 W/kg (peak pulse: 6,750 W/kg). Furthermore, its robust covalent P–O framework guarantees intrinsic thermal and electrical safety, passing nail penetration and 0V deep discharge without fire or thermal runaway.

High-Rate & Low-Temperature Benchmark: Retains ≥ 80% discharge capacity at −40°C and ≥ 90% capacity at 30C high-rate discharge, delivering ≥ 3,000 cycles at 1C/1C (≥80% retention) and ≥ 200 cycles under severe 5C charge / 30C discharge loading (≥75% retention).

2. Core Architecture & Extreme-Environment Advantages

Housed in a precision 135070 prismatic pouch format (50 × 70 × 12.8 mm) with high-conductivity aluminum-to-copper nickel-plated tabs, the cell delivers two decisive performance advantages over conventional lithium and sodium chemistries:

1,125 A/kg Continuous / 2,250 A/kg Pulse Delivery

Engineered with thick-foil, low-tortuosity active coatings and dual 12 × 0.3 mm nickel-plated tabs, preventing local hotspots and severe voltage sag during intense power bursts:

Specific continuous current: 1,125 A/kg (72.0 A continuous @ 10–45°C)
Specific pulse current: 2,250 A/kg (144.0 A, 3s pulse @ 0–45°C)
Gravimetric continuous power: 3,375 W/kg (peak pulse: 6,750 W/kg)
High-rate discharge retention: 1C (≥99%), 10C (≥94%), 20C (≥92%), 30C (≥90%)

0V Over-Discharge Safe & Thermal Abuse Immunity

Covalent polyanionic bonds eliminate oxygen release at high potential or high temperature, making the cell virtually immune to catastrophic thermal runaway:

0V Deep Discharge Immunity: Discharged to 0.0V at 1C with ≥99% capacity recovery
Puncture Proof: Passes Φ0.8 mm tungsten needle penetration (80 mm/s) with no fire
Overcharge & Thermal Robustness: Passes 3C/5.1V overcharge and 130°C (30 min) hotbox
Self-discharge: ≤3% over 28 days storage at ~50% SOC (25°C)

3. Verified Technical, Dimensional & Thermal-Rate Specifications

All parameters below are verified factory specifications for the ATOMFAIR Model 135070-3.0V-1.8Ah-I (SEHEY-1.8Ah) cell tested at 25 ± 2°C and 45–85% RH:

3.1 Essential Electrical, Gravimetric & Tab Parameters

Technical Parameter	Verified Specification	Test Basis / Condition
Cell Model & Chemistry	135070-3.0V-1.8Ah-I • Polyanionic Sodium-Ion (NFPP)	SEHEY-1.8Ah Series
Nominal Capacity	1.8 Ah (Minimum ≥ 1.8 Ah)	0.5C CC/CV to 3.9V, 0.5C discharge to 1.5V
Nominal Energy	5.4 Wh (~84.4 Wh/kg gravimetric density)	0.5C discharge @ 25°C
Nominal Plateau Voltage	3.0 V	Single-cell plateau voltage
Operating Voltage Window	1.5 V to 3.90 V (1.0 V cut-off for ≥10C / low-temp tests)	Charge cut-off current: 0.05C
Continuous Specific Current	1,125 A/kg (40C continuous / 72.0 A)	10–45°C ambient window
Pulse Specific Current (3s)	2,250 A/kg (80C pulse / 144.0 A)	0–45°C ambient window
Continuous Specific Power	3,375 W/kg (Peak pulse: 6,750 W/kg)	Calculated from 3.0V × discharge current
Internal Impedance (AC 1 kHz)	≤ 3.0 mΩ	1 kHz AC four-terminal bridge
Standard / Max Charge Current	1C (1.8 A) Standard / 6C (10.8 A) Maximum	CC/CV to 3.90 V (0.05C cut-off @ 23–35°C)
Cell Dimensions (W × H × T)	50 ± 0.5 mm (W) × 70 ± 1 mm (H) × 12.8 ± 0.2 mm (T)	Strict portrait format (excluding tabs)
Electrode Tab Geometry	Center Pitch L1 = 25 ± 1 mm; Length L2 = 15.0 ± 0.5 mm; Width L3 = 12 ± 0.2 mm; Thickness 0.3 mm	Al-to-Cu transition with Ni plating
Cell Net Weight & Shipping SOC	64 ± 5 g \| Shipped at ~50% SOC	Self-discharge ≤3% (28 days @ 30–50% SOC)
Storage Temperature Window	−30°C to +35°C, Relative Humidity < 70% (~50% SOC)	28d @ 25°C: ≥97% retention / ≥98% recovery

3.2 Temperature-Coupled Maximum Charge & Discharge Current Envelopes

Temperature Band	Max Allowed Charge Current	Max Continuous Discharge Current
−40°C to −30°C	Charging Prohibited	5C (9.0 A) • [0.5C retention ≥80% @ −40°C]
−30°C to −20°C	Charging Prohibited	20C (36.0 A) • [0.5C retention ≥85% @ −20°C]
−20°C to −15°C	0.2C (0.36 A)	30C (54.0 A)
−15°C to −10°C	0.3C (0.54 A)	30C (54.0 A)
−10°C to −5°C	0.5C (0.90 A)	30C (54.0 A)
−5°C to 0°C	1.0C (1.80 A)	30C (54.0 A) • [0.5C retention ≥97% @ 0°C]
0°C to 10°C	5.0C (9.00 A)	30C (54.0 A)
10°C to 23°C	5.0C (9.00 A)	40C (72.0 A) • [80C / 144 A pulse for 3s]
23°C to 35°C	6.0C (10.80 A) (Peak Charge Rate)	40C (72.0 A) • [0.5C retention ≥100% @ 25°C]
35°C to 45°C	3.0C (5.40 A)	40C (72.0 A) • [0.5C retention ≥100% @ 45°C]
45°C to 60°C	2.0C (3.60 A)	30C (54.0 A) • [0.5C retention ≥100% @ 60°C]

4. Verified Abuse & Safety Test Suite, Applications & Storage Maintenance

4.1 Factory Mechanical & Electrical Abuse Verification Suite

Abuse Test Item	Test Protocol (100% SOC Charged @ 1.0C to 3.9V)	Verified Result
Overcharge Abuse	Charge at 3.0C constant current to 5.1 V at 25 ± 2°C	No fire, no explosion
0V Over-Discharge Abuse	Discharge at 1.0C to 0.0 V, rest 30 min, recharge at 1.0C to 3.9 V	No fire/leakage; ≥99% recovery
Nail Penetration Test	Penetrate geometric center with Φ0.8 mm tungsten steel needle at 80 mm/s	No fire, no explosion
External Short Circuit	Direct short circuit across terminals (circuit resistance ≤ 5 mΩ) for 10 min	No fire, no explosion
130°C Hotbox Thermal Shock	Ramp at 5°C/min to 130 ± 2°C and hold for 30 minutes	No fire, no explosion
Thermal Shock Cycling	−40°C (1 h) ↔ +85°C (1 h) rapid transition for 32 consecutive cycles	No fire, no explosion
Crush & Heavy Impact	R75 mm semi-cylinder crush to 2.67 kN / 15% deformation; 9.1 kg impact from 610 mm	No fire, no explosion
Low Pressure, Drop & Vibration	11.6 kPa for 6 h; 1.2 m drop onto concrete (4×); 10–55 Hz (0.16 mm) sweep for 90–100 min	No leakage, no fire, no explosion

4.2 Storage Maintenance Schedule & Tab Welding Instructions

Long-Term Storage Recharge Schedule: Store cells at ~50% SOC in a cool, dry environment (−30°C to 35°C, <70% RH). For storage exceeding 30 days, recharge to ~50% SOC every 6 months (at −10°C to 30°C), every 3 months (at 30°C to 45°C), or every 1 month (at 45°C to 60°C);
Tab Soldering / Ultrasonic Spot Welding: Both tabs feature an aluminum-to-copper transition with nickel plating (12 mm width × 15 mm length × 0.3 mm thickness), enabling direct nickel-strip laser/spot welding or low-temperature soldering without specialized aluminum flux;
Dedicated Sodium-Ion Cycler / BMS Settings: Configure upper charge cut-off to 3.90 V (3.60 V for high-rate 5C/30C pulse buffering) and lower discharge cut-off to 1.50 V (1.00 V under ≥10C pulse load).

5. Production-Ready Battery Cells & Packs Selection Matrix

Compare the 135070 1.8Ah high-rate NFPP pouch cell against complementary production-ready ATOMFAIR finished battery cells and assembled packs (100% production-ready, no dry cells):

Product Model	Format & Chemistry	Capacity & Rate	Primary Application
NFPP 135070 Pouch Cell (This Model)	Prismatic Pouch • NFPP Sodium-Ion	1.8 Ah • 1,125 A/kg (40C/80C)	Cold-cranking starters & pulse energy storage
18650 Cylindrical Sodium-Ion Cell (1.8Ah)	18650 Cylindrical • Sodium-Ion	1.8 Ah (1800 mAh, 3.0 V)	Cylindrical fixture packs & standard holders
High-Rate Semi-Solid Pouch Cell (17Ah)	Prismatic Pouch • Semi-Solid	8–17 Ah • 12C Continuous	High-capacity drone & robotics power
High-Rate Li-Ion Power Cell (4Ah)	Prismatic Pouch • High-Rate Li-Ion	4.0 Ah • 7C Continuous	High-current lithium-ion power buffering
Semi-Solid Pouch Battery Pack (56Ah)	Multi-Cell Pack • 6S–18S Modules	56 Ah • 3.95V Base Module	Turnkey high-energy battery module arrays

Need custom module assembly (e.g. 4S1P 12V cold-start battery packs) or laser-welded busbars? Inquire About Custom Battery Pack Engineering

Custom Battery Pack Prototyping & Cell Grading

Atomfair provides precision cell batch grading (capacity matching within ±1%, OCV sorting, and AC impedance pairing within ΔIR ≤ 0.2 mΩ), custom spot-welded nickel interconnects, laser-welded terminal busbars, and integrated high-rate BMS protective enclosures.

SUBMIT PACK SPECIFICATIONS →

TAILORED B2B SOLUTIONS FOR OEM, HARDWARE & SYSTEM INTEGRATORS

Volume Commercial Quotations, Factory-Matched Cell Sorting, Custom Tab Laser Welds, UN3480/UN3551 Dangerous Goods Air/Sea Logistics, and Net-30 Terms for Qualified Industrial Accounts.

CONTACT ENGINEERING: INQUIRY@ATOMFAIR.COM

Verified US Supplier: Atomfair LLC (Wyoming, USA) • Brand: ATOMFAIR® • Advanced Battery Cells Division • Batch-Graded & Impedance-Matched • Certificate of Quality Inspection Included

Sodium-ion battery