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.