Project 1 Mechanical design of battery pack

Ans:- Li-ion Cell

They deliver high power due to their use of nano phosphate battery technology. For good life cycle, stable float reliablity, this cell are suitable for wide variety of power application. Nanophosphate battery technoloogy offer thermal stable chemistry, fast charging, low capacity loss over time. It provides extremely safe condition for while meeting most demanding requirement. Multiple layer of protection are employed on chemistry and system level to achieve an energy storage solution.

Dimension:-

Cell Specification:-

Discharge voltage and cycle life with respect to different operating temperature.

Design of 18 KWH battery pack

Assumption-

Voltage required to run motor- 400 V

i) Number of cells required- energy/(nominal voltage*capacity)

N=18000/(3.3*2.5)

N=2182

In series configuration voltages will be sum of individual voltage and capacity will remain same. In parallel configuration, capacity is increased and voltage remains same.

Number of cell required to connect in series= voltage required/nominal voltage

Ns= 400V/3.3

Ns= 122

number of cell required to connect in parallel= Total cell/Ns

Np= 2182/122

Np= 18

ii) Battery capacity

Capacity= 18*2.5Ah

Capacity= 45 Ah

iii) Range

Power train energy consumption 100 Wh/Km

Range= Capacity/ energy consumed per Km

Range= 18000/100

Range= 180 Km

iv) Internal Resistance

The entire resistance encountered by a current as it flows through a batttery from negative terminal to positive terminal is known as internal resistance battery.

vi) Battery dimension

Length of casing= 122*30+60

L= 3720mm

Breadth of casing= 18*30+60

B= 600 mm

Height= 65+35

Height= 100 mm

vii) Weight of Battery pack

W= cell weight * number of cell+ weight of accessories

W= 76*2182+ 4.5= 170.3 kg