Project 1 Mechanical design of battery pack
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Battery pack capacity: 18 kWh
Cell: ANR26650M1-B
Prepare a detailed battery pack drawing along with its enclosure. State your assumptions.
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Ans:
Given that the total battery pack capacity is -18 kWh = 18000 wh
ANR26650M1-B:
The battery cell redious is-
The battery hight is
-
The battery cell holder basically holding the battery cell at position and its give the battery pack a perfect shape.
the total pakage or total module looks like-
Here the aluminium plates are added to connect the connection as parallal and series structure.
There are the three type of structure present here first is series ,second is paralel and third is series and parallel combined.
This is the temparature charectaristics:
This is the Discharging life cycle:
From this deta sheet we show that the battery cell capacity is 2.5 Ah
Assumtion:
Let the battery pack output voltage 72V
Calculation:
so battery pack output must be 72 V .
Motor load current = watt / volt
current = 18000 w / 72 volt = =250 A (we can assume)
Total battery requare for maitain the output volt = output volt / per cell batteryvolt
Output volt= 72 / 3.3 = 21.81 =22
So , we need 22 nos battery in series for make 72 volt output.
per cell power is 2.5 Ah
per cell watt =2.5 x3.3 = 8.25 Wh
So total no of battery requaremant is ( Total power / per cell watt)
Total no of battery = 18000 / 8.25 = 2181.81=2182 nos
Now the total no of parallal (of 22 nos series connection) connection = 2182 / 22 =99.18 =100 we can assume 100 nos in series for round figure. [becouse battery no never be a fraction no]
Battery pack dimention:
Total no of battery 606 nos requare.
No of series =22.
No of parallal = 100.
for 22 nos series battery length =22 x battery diameter
series battery length= 22 x 26 mm =572 mm=0.572 m
for 100 nos parallal battery pack length = 100 x 26 = 2600 mm =2.6 m
Total battery pack volume = 572 x2600x65 sq mm
=96668000 sq mm =0.096668 sq m