LITHIUM ION BATTERIES GOWTHAM. S
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LITHIUM ION BATTERIES GOWTHAM. S
LITHIUM ION - NCR18650A
NCR 18650A FEATURES & BENEFITS
• High Energy Density Better than Ni – MH and Ni-Cd batteries.
• High Voltage Produces 3.6V and it lighter and smaller.
• No Memory Effect “Memory Effect” refers to the phenomenon where the apparent discharge capacity of a battery is reduced when it is repetitively discharged incompletely and then recharged.
• Flat Discharge Voltage Stable Power output throughout operating range.
CYLINDRICAL BATTERIES PROS CONS
• Ease of Manufacturing- They can be mass produced and fabrication is quite simple.
• Low Operating Cost Lower watt-per-hour price.
• Better Thermal Management –
Free space is available to install
thermal management systems.
• Low Space Efficiency - Not suitable for applications having strict space constraints.
• Mechanical Deformation - Cell
disintegration cannot always be prevented but propagation can. Space must be provided to allow for deformation.
PRISMATIC BATTERIES PROS CONS
• Space Efficiency - Thin profile, lightness and effective use of space.
• Design Flexibility - Can be made to
fit any profile.
• Costly - Expensive to design and manufacture.
• High Operating Cost Higher watt-per-hour price.
• Life – period is low - Thermal management is less effective. Sensitive to deformation in high pressure situations.
PRACTICALITY OF LITHIUM ION BATTERIES
Length (mm) 353 260
78 % Smaller Width (mm) 175 168
Height (mm) 190 212
Weight (kg) 27 13.6 50 % Lighter
Cost (Rs.) 13,000 85,000 550 % Costlier
EXIDE MTDIN100 POWERBRICK+ 100
*Battery Selection for BMW 320-d
HOW IT WORKS?
CATHODE Lithium Nickel Cobalt Oxide
doped with Aluminium
ANODE Graphite
ELECTROLYTE Solution of lithium salt, such as
LiPF6 in an organic solution.
SEPERATOR Thin sheet of micro-perforated
plastic.
THERMAL MANAGEMENT
Standard Operating Conditions for NCR 18650A
Charge 0 – 45o C
Discharge -20 – 60o C
Storage -20 – 50o C
Positive Temperature Co-efficient Element (PTC) • When the temperature of the batteries is above the
cut-off temperature, the resistance of the PTC will be increased significantly.
• The current going in or out of the batteries will be decreased.
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