Project 1 Mechanical design of battery pack

The specifications of Cell ANR26650M1-B given in the datasheet are:

Diameter = 26 mm

Height = 65 mm

weight = 76 grams

Nominal Voltage = 3.3 V

Nominal Cell Capacity = 2.5 Ah

Battery Energy Capacity = 3.3*2.5 = 8.25 Wh

The battery pack that has to be made using ANR26650M1-B is of Energy capacity 18kWh or 18000Wh

For making a battery pack with 18kWh, it is better to have ten modules of 1800 Wh each.

Number of cells in a module = 1800Wh / 8.25 =220 approx

So the configuration for a module will be 44p5s.

The cad Drawing of cell and cell holder is shown below:

The Cab Drawing of a module (44p5s) with the energy of 1815 Wh is shown below:

This module will have the following specifications:

Nominal Voltage = 5*3.3 V = 16.5 V

Nominal Cell Capacity = 44*2.5 Ah = 110 Ah

Battery Energy Capacity = 16.5 * 110 = 1815 Wh

For having an energy content of 18kWh a total number of 10 modules will be required. They will be connected in series making a pack of 50s44p. They will produce energy of 1815*10 = 18150 Wh = 18.15 kWh

This 10 module pack will have the following specifications:

Nominal Voltage = 50*3.3 V = 165 V

Nominal Cell Capacity = 44*2.5 Ah = 110 Ah

Battery Energy Capacity = 165 * 110 = 18150 Wh = 18.15 kWh