Project 1 Mechanical design of battery pack
Battery pack capacity: 18 kWh
Cell: ANR26650M1-B
Prepare a detailed battery pack drawing along with its enclosure. State your assumptions.
ans
nanophosphate high power lithim ion cell anr26650m1-B
A123 (LiFePO4) bsttery technology delivers hign power and energy density combined with excellent safety performance and extensive life cucle in a lighter weight & compact package.this cells have low capacity loss and impedence growth over timeand high usable energy over a wide SOC renge sto meet end off life power and minimal pack oversizing.
commercial solution
*data center ups
*telecom backup
*it backup
*AGV
*robotics
*medical devices
govt solution
*millitary vehicles
*directed energy
transportation
*commercial vehicles
*passenger vehicles
lithiumwerks ANR26650M1-B is the next generation of A123 systems pioneering 26650 cyllindrical cell now with greater power and energy density and lower impedance.
about module
a battery management system(BMS)IS any electronic system that manages arechargeable cycle for protecting battery from it safe operating area,monitor its state,calculating secondary data,reporting that data,controlling its environment
a battery pack is a set of any no. of identical battery.they are configured ina series ,parallel and mixture to deliver the desired voltage,capacity or power density
mechanical design of battery pack
attribute of battery pack are
*maximum traction motor torque
*maximum regenerative brake torque
*vehicle range
*vehicle total weight
*vehicle price
4 cor3 input parameter
*chemistry
*voltage
*average energy consumpyion on a drive cycle
*vehicle range
a battery are electochemical cells which are converting chemical energy into electrical energy or vice versa
major components
anode and cathode
separator
terminal
electrolyte
enclosure
there are several type of chemistry used in Electrical vehicle propulsion sytem
EV design-battery calculation
assumptions:
battery energy=18kwh
voltage(to run the vehicle)=400V
(i)Energy=18kwh
(II)no. of cells(N)=ENErgy/nominal coltage
N=18000/(3.3*2.5)
N=2182
we need a minimum of 2182 cell to get 18 kwh energy now based on that we need to decide configuration=series and parallel
in series configuration capacity remains the same and voltage will be the sum of single cell voltage
in series capacity remains the same and voltage is sum of individual cell voltage
in parallel the voltage remains the same and capacity accumulates
no. of series cell required to produce 400V=voltage required/nominal voltage of one cell
Ns=400/3.3
Ns=121.21=122
122 cell are connected in series will generate 400 voltage and the capacity of whole module will be 2.5 Ah
now we need to find the no. of cells will be connected in a parallelcon.
Np=total cell/Ns
Np=2182/122
Np=17.8=18
so we take 18 cell in parallel for each
cell archtecture =122 cells in series and 18 parallel=122S18P
(iii) battery capacit
capacity=parallel cell row* individual cell capacity
=18*2.5
=45Ah
(IV) current supplied by the battery
we have calculated battery capacity which is 45Ah means it is going to supply 45A current per hour. which can be considered as C rate
(V) range
let powertrain energy consumption=100Wh at 70% powertrain efficiency
Range=capacit/energy consumed per kilometre
Range=180 km
(vi)internal resistance of battery
the entire resistance of battery:
the entire resistance encountered by a current as if flows thru a batteryu from negative terminal to the positive terminal is known as internal resistance of battery
(VII)battery dimensions
ANR 26650 CEll has 26 mm dia and 65 mm height. on the basis of that we need to decide battery size of battery casing.
Length of casing(L)=NO. OF CELL AT SERIES*(cell dia)+margin at both side+clearance at side
L=122*30+60
L=3721mm
Breadth of casing(b)=NO. OF CELL at parallel*(cell dia(26))+margin at both side(4)+clearance at side(dia. of edged cell+Margin)
B=18*30+60
B=600mm
height of casing (H)=65+35(heightof cell+margin for wiring,cell holders and metal strips)
H=100mm
(VIII)battery pack weight
cell weight=76g
no. of cell=2182
Batery pack weight(W)=cell weight*no. of cells+weight of accesories
W=76*2182+4.5=170.3 kg
cyllindrical battery pack assembly equipement
Lithium ion and lithium ion polyner batteries are a great power source for some application but they require preventive protection during discharging and charging