Design of battery pack

OBJECTIVE-1:

Prepare a detailed battery pack along with its drawing. State your assumptions.

ASSUMPTION DATA:

Battery pack capacity: 18 kWh, Cell: ANR26650M1-B.

Datasheet Reference link

https://drive.google.com/file/d/18F2QPjldeIpYehuhDBmAa4glsRzb9E-n/view?usp=sharing

Single-cell estimation:

Voltage = 3.35V

Capacity = 2.5Ah

Energy capacity = 3.3*2.5 =8.25 watt hour

Let's assume the motor with the voltage of 300V

Single module design:

The design of a single module with 30 cell series with 8 cells parallel. So this arrangement provides the 100 voltage with the total amp-hour of 20Ah.

Module design:

Design of 3s 3p module for the battery pack 18,000wh

1. The number of series modules is 3, so each module with the 100 v forms the 300v, That is the required voltage for the motor operation.
2. The number of parallel modules is 3, to calculate the Ah related to the 300v motor.
3. Divide total capacity by voltage the total Ah can be obtained. Then dividing total Ah by the number of modules gives Ah of a single module.
4. 18KV/300V =60Ah/3 =20Ah.

RESULT:

To cross-check the design for 18kwh let’s do a total capacity calculation:

(No.of module)*(no.of series cell in module *volt)*(no.of parallel cells in module*Ah)

(3*3) * (30*3.35) * (8*2.5) =18,090wh

So the battery pack designed for the 18,090wh exactly satisfies the design requirement of 18Kwh. The additional 90wh can be used for the other electrical accessories in the car.