Battery pack capacity: 18 kWh

Cell: ANR26650M1-B

Prepare a detailed battery pack its enclosure. State your assumptions.

ans -

Cell: ANR26650M1-B specifications

calculations with some assumptions

https://a123batteries.com/anr26650m1-b-lithiumwerks-nanophosphate-3-3v-2-5ah-lithium-iron-phosphate-battery/

ANR26650M1-B Specifications

Nominal Ratings

Voltage: 3.3 Volts

Capacity: 2.5 Ah

Energy: 8.25 Wh

Specific Power: 2600 W/kg

Impedance (1KHz AC Typical) 6 mΩ

Cycle Life at 1C/1C, 100% DOD: > 4000 cycles

Cell Type: 26650 Lithium Ion Power Cylindrical Cell

Discharging

Max Continuous Discharage: 50 A

Max Pulse Discharge Current >50% SOC (10s): 120 A

Minimum Voltage: 2 Volts

Temperature: -30ºC to 55ºC

Charging

Recommended Standard Charge: 2.5 Amps

Max Charge Rate: 10 Amps

Max Pulse Charge Current <50% SOC (10s): 25 A

Float Voltage: 3.45 Volts

Recommended charge V & Cut-off Current: 3.6 Volts, taper to 125mA

Temperature

(reduce charging current to 250mA when under 0ºC): 0ºC to 55ºC

Mechanical

Diameter: Ø25.96 +/- 0.5 mm (1.0")

Length: 65.15 +/- 0.5 mm (2.6")

Mass: 76 g

Calculation assumptions:- 18kWh Battery Pack

calculation designing 18kWh battery pack energy require to vehicle its proper range is depending voltage (V) parameter ampere-hour or capacity (Ah).

design high voltage battery pack electric vehicle range up to 220 km. 145.2 V a nominal voltage series connection.

the volume of the cell used to find out the total volume of the battery pack.

- Single Cell Energy (Wh)

= Cell Capacity (Ah) x Cell Voltage (V)

= 2.6 x 3.3

= 8.58 Wh

value of single cell is calculate total energy of the battery pack.-Single Cell Energy Density

Volumetric energy (Wh/m^3) = Single Cell Energy / Volume of each cell

= 8.58 Wh / 0.03451 m^3

= 248.62 Wh/m^3

Gravimetric energy (Wh/kg) = Single Cell Energy / Single Cell Mass

= 8.58 Wh / 0.076 kg

= 112.89 Wh/kg

Calculation of High Voltage Battery Pack

calculation of battery pack a vehicle to achieve 250 km, 18 kWh battery pack. Also, 145.2 nominal voltage for series connection.

Vehicle Range = 250 KM (assumed)

Battery Pack capacity = 18.121 kWh or 18120.96 Wh (For better and accurate calculation here I change kWh)

We will calculate per km average energy = 18120.96 / 250

= 72.483 Wh/km

Therefor,

Battery Pack total energy = Average energy x km

= 72.483 x 250

= 18120.96 Wh or 18.120 kwh

Nominal voltage for series connection = 145.2 V, Basically the motor power value according to the motor.

- Number of cells connected series

= Nominal voltage of series connection / Nominal voltage of a single cell

=145.2 V / 3.3 V

= 44

44 Cells connected in series connection provide a proper voltage.

- Energy for battery pack (wh)

= No. of cells connected in series x Single-cell energy

= 44 x 8.58 wh

= 377.52 wh

-- Number of cells connected in parallel

= Battery pack total energy (wh) / Energy for battery pack (wh)

=18120.96/377.52

= 48

48 cells will be connected in parallel to provide a proper capacity power.

-- Battery pack total energy (wh)

= No. of cells connected in parallel x Energy for battery pack (wh)

= 48 x 377.52

= 18120.96 wh or 18.120 kWh

-- Battery pack capacity

= No. of cells connected in parallel x Single cell capacity (Ah)

= 48 x 2.6 Ah

= 124.8 Ah

The battery pack capacity is total power required by the vehicle.

-- Total number of cells for battery pack

= No. of cells connected in parallel x No. of cells connected in series

=48x44

= 2112

2112 Cells a complete battery pack.

-- Mass of battery pack

= Total no. of cells for batter pack x Mass of single cell

= 2112 x 0.076 kg

= 160.512 kg

total weight of cells connected in parallel and series.

-- Total volume of the battery pack

= Total no. of cells for batter pack x Volume of single cell

= 2112 x 0.0345

= 72.89 m^3

This is the volume of2112 cells which are used in the battery pack system.

-- Cell peak current (A)

= C rate (Max Pulse Charge Current) x Single cell capacity

= 20 x 2.6

= 52 A

-- Battery pack peak current (A)

= Cell peak current x No. of cells connected in parallel

=52X48

= 2496 A

operation of the battery pack. a vehicle decide power is required to move.

-- Battery pack peak power (W)

= Battery pack peak current x Voltage of series connection

= 2496 A x 145.2

= 3624192 or 362.42 W

-- Cell continuous current (A)

= Crate (Max Continuous Charge Current) x Single cell capacity

= 10 x 2.6

= 26 A

-- Battery pack continuous current (A)

= Cell continuous current x No. of cells connected in parallel

= 26 x 48

= 1248 A

power which is supply continue whole battery pack system.

-- Battery pack continuous power (W)

= Battery pack continuous current x Voltage of series connection

=1248 x145.2

= 18120.96 or 18.120 Kwh

detailed battery pack drawing along with its enclosure.

BATTERY HOLDER ,SPACER For CELL CYLINDRICAL LI-ION

Nickel Strips

Nickel strip is battery building. efficiency of usage in spot welding and soldering as well high corrosion resistance over time good properties and excellent resistance to many corrosive environments. The pure nickel will never get rust after it applied to battery packs. It won’t affect the current transfer between batteries.

Pure nickel strips material you want buymany vendors swap out it for nickel-plated steel strips, poorer greater resistance – not suitable most battery projects.

100% pure nickel strip. high-quality pure nickel.solder incredibly quickly, weld them your existing busbar connections supply current pull through the busbars. The benefits nearly limitless!

battery enclosure

Design Benefits

• Up to 50 percent lighter than an equivalent steel design
• Best-in-class mass energy density at more than 160

watt-hours per kilogram, an extremely efficient design

for OEMs and Tier 1 battery pack manufacturers.

• Accommodates all battery cell types and is designed

particularly for battery electric vehicles with larger

power packs such as pick-up trucks, sport utility

vehicles and crossovers.

• Most cost-effective aluminum solution for mass

production electric vehicles when compared to

aluminum extrusion and casting-intense designs.

• Low price premium on $/kg saved compared

to equivalent steel designs at substantially

lower weight.

Power (p)= Voltage (v) * Current (i) kw

3.3 *2.5 =8.25 kw

18kwh , 48s 48p

i.e; 48*48 =2304 cells

series connection 48*3.3 =158.4 v

parallel connection 48* 2.5 =120 A

158.4* 120 =19.008 kwh energy or capacity. design battery pack 48s ,48p cell along wth battery spacers to hold cells connection nickel strip is used

cells connected nickel strip spot welding cell not get damage.

final form