Project 1 Mechanical design of battery pack

The A123's high performance Nanophosphate lithium iron phosphate (LiFePO4) battery technology delivers high power and energy density cobined with excellent safety performance and extensive life cycling in a lighter weight, more compact package. Our cells have low capacity loss and impedamnce growth over time as well as high usable energy over a wide state of charge(SOC) range, allowing our systems to meet end of life power and energy requirements with minimal pack oversizing.

The cell have the following specification

Cell Dimensions                                              :26 x 65 mm
Cell Weight                                                     : 76 g
Cell Cpacity (nominal/minimum) (0.5C Rate)     : 2.5/2.4 Ah
Voltage (nominal)                                           : 3.3 V
Internal Impedance (1kHz AC typical)               : 6 mohm 
Power                                                            : 2600 W/kg
Recomneded Standard Charge Method              : 2.5 A to 3.6 V CCCV,60 min
Recomended Fast Charge Method to 80% SOC   : 10 A to 3.6 V CC,12min

Maximum Continuous Discharge                       : 50A
Maximum Pulse Discharge (10 seconds)            : 120A
Cycle Life at 20A Discharge, 100% DOD            : >1,000 cycles
Operating Temperature                                    : -30 degree celsius to 55 degree celsius
Stroge Temperature                                         : -40 degree celsius to 60 degree celsius

The number of batteries are calculated and amoung them the number of batteries in series and parallel are also calculated.

The pack configuration is 22S100P which has 2200 cells in total.

The required calculation are made with reference to the data sheet.

Advantages

• Abuse Tolerance
• Envirnmental Friendly

Applications

• Commercial Solutions

Advanced Lead Acid Replacement Batteries for:

-Data center UPS

-Telecom backup

-IT backup

-Autonomously guided vehicles

-Industrial robotics and material ahndling equipments

• Government Solutions

-Military vehicles

-Military power grids

-Soldier power

-Directed Energy

• Grid Solutions

-Frequent Regulation

-Renewables integration

-Reserve Capacity

-Transmission and Distribution

• Transportation Solution

Hybrid,Plug-in-Hybrid and electric battery systems for

-Commercial Vehicles

-Off Highway Vehicles

-Passenger Vehicles