To prepare a detailed battery pack of 18kWh capacity with ANR26650M1-B cell.

LithiumWerks ANR26650M1-B, 3.3 Volt, 2.5Ah, Lithium Iron Phosphate (LiFePO4) Battery

Lithium Ion cell, Nanophosphate® (LiFePO4) Technology (Formerly A123 Systems)

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Manufacturer:	LithiumWerks
Mfg PN:	300732-006
Chemistry:	Lithium Iron Phosphate (LiFePO4)
Voltage:	3.3 Volts
Capacity @ 25°C:	2.56 Ah
Energy @ 25°C:	8.25 Wh
Energy @ 25°C:	8.25 Wh
Specific Power:	>4000W/kg | (@ 25°C, 2 sec pulse)
Impedance:	>6mΩ | (1kHz AC) Typical)
Cycle Life:	> 4000 Cycles | (@ 1C/1C, 100% DOD)
Dimensions
Height (max):	65.15 (+/- 0.5 mm)
Diameter (max):	25.96 (+/- 0.5mm)
Mass:	39.5 (+/- 1.0 g)
Warranty:	DOA

Features

The ANR26650M1-B is the next generation of A123 Systems’ pioneering 26650 cylindrical cell, now with greater power and energy density and lower impedance. This versatile lithium ion cell is suitable for a wide variety of applications and system designs. Proven performance in the toughest conditions, combining durability, reliability, and safety, the ANR26650 cell offers an excellent combination of price-performance.

Cylindrical Cell Primary Applications

• Portable high power devices
• Stationary battery backup systems
• Grid stabilization energy storage systems
• Commercial truck and bus hybrid electric vehicles (HEVs)

Nanophosphate® LiFePO4 Benefits

• Cycle Life at 1C/1C, 100% DOD, > 4000 cycles
• Safety: Excellent abuse tolerance and environmentally friendly
• Life: Excellent calendar life, 10X cycle life vs. conventional lithium ion

Specifications , dimensions , cell life cycles and temperature effects are traced from the data sheet of the cell , link is provide below of the data sheet .

https://store-cvt2jlgam8.mybigcommerce.com/content/LithiumWerks%20ANR26650M1-B%20Power%20Cell%20%28030921%29%20Data%20Sheet.pdf

calculations as per assumptions 18 kWh battery pack

The mathematical calculation for designing an 18kWh battery pack, basically 18kWh is energy require to achieve the vehicle its proper range. It is depending upon the voltage (V) parameter and ampere-hour or capacity (Ah).

Here I used to design a high voltage battery pack for an electric vehicle to achieve its range up to 100 km. For this calculation, I assumed 200 V a nominal voltage for series connection.

Mathematical battery calculation

single cell calculation

volume=`pir^2h`

=3.14*0.013.^2*0.065

=0.0345 m.^3

Calculation for parameters of battery pack

Let me assume that vehicle range is 100 km.

Average energy of vehicle =18000/100=180 Wh/km

Let us assume the voltage of series connection is 200 v. Basically this is depends on the motor parameters.

No. of cells connected in series=200/3.3=60

W.K.T power=I.V

I=P/V=18000/200=90 Ah

No. of cells connected in parallel =90/2.56=35.2

Hence , total number of cells in the pack =60*35.2=2112

Mass of the battery pack = total No. of cells * each cell mass

= 2112*0.076

=160.512 kg

Volume of the pack = total No. of cells * each cell volume

=2112*0.0345

=72.89 m^3

cell peak current = Crate (max. pulse charge current)*single cell capacity

=20*2.6

=52A

Battery pack peak current =total No. of cells in paralel * each cell peak current

=35*52

=1830 A

cell continous current = Crate (max. continous charge current)*single cell capacity

=10*2.6

=26 A

Battery pack continous current =total No. of cells in paralel * each cell continous current

=35*26

=1830 A

=910 A.

Assembling and contruction of battery pack

Those 176 cells are connnected in 11s16p configuration .

hence we need more cells in parallel than series connection so we should use this configuration .

In tesla vehicle battery pack.

Hence after completion of battery pack , it will install in the car body.