Nickel Iron Battery Manufacturing

NiFe Factory Material and Plate Model for 20 MWh/year

Assumptions:

• Plant output: 20,000 kWh/year
• Planning mass intensity: 20 kg/kWh finished wet battery
• Total finished battery mass: 400 t/year
• 20-foot container payload basis: 28.3 t/container
• Plate area model: 40 mg/cm² coated-face loading, 75% utilization, 1.2 V nominal
• Resulting areal energy density used for sizing: 104 Wh/m² of coated face

Material / Metric	Unit basis	Per kWh	Annual total for 20 MWh	Commodity cost	Commodity $/kWh	Annual commodity cost	Integrated $/kWh	Annual integrated cost	20 ft containers by weight
Nickel, contained metal	kg	1.20	24.0 t	$17.34/kg	$20.81	$416,160	$20.81	$416,160	0.85
Nickel hydroxide equivalent	kg	1.90	37.9 t	derived from nickel content	n/a	n/a	n/a	n/a	1.34
Iron powder	kg	5.50	110.0 t	$2.00/kg purchased	$11.00	$220,000	$4.40	$88,000	3.89
Steel mesh / sheet / case internals	kg	6.00	120.0 t	$1.018/kg purchased	$6.11	$122,160	$3.60	$72,000	4.24
KOH, dry basis	kg	2.00	40.0 t	$0.91/kg	$1.82	$36,400	$1.82	$36,400	1.41
HDPE / PP case resin	kg	1.00	20.0 t	$0.87/kg	$0.87	$17,400	$0.87	$17,400	0.71
Copper bus bars / terminals	kg	0.30	6.0 t	$12.758/kg	$3.83	$76,548	$3.83	$76,548	0.21
Separator + binder + additives	kg	0.80	16.0 t	$3.00/kg assumed	$2.40	$48,000	$2.40	$48,000	0.57
Deionized water	kg	3.20	64.0 t	$0.001/kg assumed	$0.00	$64	$0.00	$64	2.26
Total		20.00 kg	400.0 t		$46.84/kWh	$936,732	$37.73/kWh	$754,572	14.13

Electrode Plate Area Model

The next table is for factory sizing of the electrode fabrication line. It uses the aggressive planning assumption of 104 Wh/m² of coated face.

Plate metric	Formula basis	Per kWh	Annual total for 20 MWh
Positive coated-face area	1000 Wh / 104 Wh/m²	9.62 m²	192,308 m²
Negative coated-face area	matched to positive area	9.62 m²	192,308 m²
Total coated-face area, both polarities	positive + negative	19.23 m²	384,615 m²
Positive metal-sheet plate area	double-coated plates, so coated-face area / 2	4.81 m²	96,154 m²
Negative metal-sheet plate area	double-coated plates, so coated-face area / 2	4.81 m²	96,154 m²
Total metal-sheet electrode area	positive sheet + negative sheet	9.62 m²	192,308 m²

Shipping Container Summary

Shipping item	Annual tonnage	20 ft containers at 28.3 t payload
Finished wet batteries	400.0 t	14.13
All nickel input, contained metal basis	24.0 t	0.85
Iron powder	110.0 t	3.89
Steel	120.0 t	4.24
KOH	40.0 t	1.41
Everything except water	336.0 t	11.87

Main Readout

• A 20 MWh/year NiFe plant at 20 kg/kWh is about 400 t/year of finished battery output.
• On purchased materials, this planning model lands near $46.84/kWh.
• With aggressive in-house iron and steel integration, the same model lands near $37.73/kWh.
• Finished-battery outbound logistics are about 14 standard 20-foot containers per year by weight.
• The electrode line must process about 384,615 m²/year of coated electrode faces under the plate-loading assumption used here.

Nickel-Iron Battery Manufacturing Process Chain

Material / Component	Raw Inputs	Processing Steps	Equipment	Output Product
Nickel hydroxide active material	Nickel scrap or nickel salts, NaOH or KOH, water	1. Dissolve nickel in acid to form nickel salt solution 2. Precipitate Ni(OH)₂ using NaOH or KOH 3. Filter slurry 4. Wash precipitate 5. Dry powder 6. Mill to particle size	Dissolution reactor Stirred tank precipitator Filter press Dryer oven Ball mill or jet mill	Nickel hydroxide powder
Iron electrode powder	Iron powder feedstock, optional additives (graphite, iron sulfide)	1. Acquire or atomize iron powder 2. Blend additives 3. Homogenize powder mixture	Powder atomizer (if internal) Ribbon blender Powder mixer	Iron electrode powder blend
Potassium hydroxide electrolyte	KOH pellets, distilled water, optional lithium hydroxide additive	1. Purify water 2. Dissolve KOH slowly with agitation 3. Add optional LiOH stabilizer 4. Filter solution	Mixing tank Agitator Filtration unit	Battery electrolyte solution (20–30% KOH)
Nickel current collector	Steel coil or mesh	1. Steel coil cleaning 2. Perforation or mesh forming 3. Optional nickel plating 4. Sheet cutting	Coil feed line Punch press Plating bath Shear cutter	Nickel current-collector sheets
Iron current collector	Steel coil or mesh	1. Coil cleaning 2. Perforation or mesh stamping 3. Degreasing 4. Sheet cutting	Coil line Punch press Degreasing washer Sheet cutter	Iron electrode mesh sheets
Nickel electrode plates	Nickel hydroxide powder, binder (PTFE), conductive carbon, solvent, collector mesh	1. Slurry mixing 2. Roll-to-roll coating onto collector 3. Drying oven 4. Compression/calendering 5. Plate cutting	Planetary mixer Coating line Drying oven Calender rollers Laser or punch cutter	Nickel electrode plates
Iron electrode plates	Iron powder mixture, binder, solvent, steel mesh	1. Paste mixing 2. Paste coating or filling into mesh 3. Drying 4. Compression/calendering 5. Plate cutting	Mixer Coating station Drying oven Roll press Plate cutter	Iron electrode plates
Separator sheets	Polypropylene, polyethylene, nylon, or cellulose sheet rolls	1. Receive separator rolls 2. Slit to width 3. Die-cut sheets	Slitting machine Die cutter	Separator sheets
Plastic battery cases	HDPE or polypropylene pellets (virgin or recycled)	1. Pellet drying 2. Injection molding 3. Cooling 4. Trim flashing	Plastic dryer Injection molding machine Trim station	Battery case halves
Bus bars and terminals	Copper bar stock or sheet	1. Cut to length 2. Drill terminal holes 3. Surface cleaning	Saw or shear CNC drill Deburring tools	Copper bus bars and terminals
Electrode stack assembly	Nickel plates, iron plates, separators	1. Pick-and-place electrode stacking 2. Insert separators 3. Align stack	Automated stacking machine Robotic arm	Cell electrode stack
Tab welding	Electrode tabs and bus bar leads	1. Align tabs 2. Weld tabs to bus bars	Ultrasonic welder Resistance welder	Electrically connected electrode stack
Cell insertion	Electrode stack, plastic case	1. Insert stack into molded case 2. Install internal insulation	Robotic assembly station	Cell assembly
Electrolyte filling	Electrolyte solution	1. Metered electrolyte fill 2. Degas air bubbles	Metering pump Fill station	Filled battery cell
Cell sealing	Cell lid, gasket	1. Lid placement 2. Ultrasonic weld or compression seal	Ultrasonic welder Press	Sealed battery cell
Formation cycling	Newly assembled cells	1. Initial charge cycle 2. Rest period 3. Discharge cycle 4. Repeat formation cycles	Programmable formation racks Battery cyclers	Activated NiFe battery cells
Quality testing	Finished cells	1. Leak test 2. Capacity test 3. Internal resistance measurement 4. Visual inspection	Pressure tester Battery analyzer Inspection station	Qualified battery cells
Module assembly	Cells, bus bars, frame	1. Arrange cells 2. Connect bus bars 3. Install terminals 4. Final inspection	Assembly bench Torque tools	Battery module
Recycling loop	Used cells	1. Drain electrolyte 2. Shred plastic cases 3. Separate metals 4. Recover nickel compounds 5. Recycle steel	Shredder Magnetic separator Chemical recovery tanks	Recovered nickel, steel, and plastics