Scribd
Upload
105 views9 pages

EV Battery Pack Design Guide

The document discusses battery pack design for electric vehicles. It explains that battery sizing depends on performance requirements, vehicle specifications like weight and geometry, and drive cycles. The process involves determining tractive force needs based on these factors, then calculating power and energy requirements to select an appropriate battery voltage, capacity in kWh or Ah, and number of cells connected in series and parallel. An example calculation is provided to find the battery requirements to provide a 100km range for a 700kg EV traveling at 90km/hr. It determines 20 cells in series and 40 in parallel would be needed, for a total of 800 cells.

Uploaded by

Somesh Bakshi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
105 views9 pages

EV Battery Pack Design Guide

The document discusses battery pack design for electric vehicles. It explains that battery sizing depends on performance requirements, vehicle specifications like weight and geometry, and drive cycles. The process involves determining tractive force needs based on these factors, then calculating power and energy requirements to select an appropriate battery voltage, capacity in kWh or Ah, and number of cells connected in series and parallel. An example calculation is provided to find the battery requirements to provide a 100km range for a 700kg EV traveling at 90km/hr. It determines 20 cells in series and 40 in parallel would be needed, for a total of 800 cells.

Uploaded by

Somesh Bakshi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 9

Battery Pack Design

Dr. Y.K. Bhateshvar


Component Sizing
• Depends on:
• Performance Req.
• Vehicle Technical Spec
• Drive Cycle/ Use
• Vehicle Technical Spec
• Weight
• Overall Gear Ratio
• Transmission System Efficiency
• Tyre Diameter
• Frontal Area
• Powertrain Efficiency
Battery Sizing…

Tractive Force
Requirement Power Requirement

Torque Requirement Energy Requirement


Battery Sizing

Battery Energy Operating


Requirement Voltage Selection

Battery Size Battery Capacity


(kWh) (Ah)
Battery Pack Design
Battery Cells Series & Parallel Connections
Numerical
How much Power & Energy require for • Motor Nominal Voltage = 72 VDC
an EV to take it to _100_km Range and • Battery Cell Voltage = 3.6V
with Speed of _90_ (km/hr)?
• Rating = 2500mAh
• Weight = 700kg
• Rint = 36mOhm
• Payload = 300 kg
• No. of Cells in series & parallel?
• Gravitation acceleration g = 9.8 m/s2
• Frontal Cross Section Area = 1 m2
• µrr = 0.015
• Cd= 0.3
• M= 1000 kg
• ρ = 1.2 kg/m3
Vehicle Parameters
Vehicle Parameters: Electrical Parameters:
Vehicle Mass 700kg Motor Voltage 72V
Payload 300kg Cell Voltage 3.6V
urr 0.015 Cell Capacity 2.5Ahr
Cd 0.3
g 9.8m/s2
Frontal CrossA 1
rho 1.2kg/m3
Velocity (km/hr) 90km/hr
Velocity (m/sec) 25m/sec
Range 100km
Answers:
Rolling Resritance (Frr) 147N To Design a Battery Pack
Drag Force (Fad) 112.5N No. of Cells (in Series) 20
TractionForce (Ft) 259.5N No. of Cells (in Parallel) 40
Traction Power (Pt) 6487.5W Total No. of Cells 800
Time to Cover Range 1.11Hr
Energy Req. from Battery (Et) 7201.125WHr
Req. Battery Capacity (AHr) 100.02Ahr

You might also like