Internet of Things: Batteries A Short Review Dr. Eng. Amr T. Abdel-Hamid NETW 1010 Fall 2013.
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Transcript of Internet of Things: Batteries A Short Review Dr. Eng. Amr T. Abdel-Hamid NETW 1010 Fall 2013.
![Page 1: Internet of Things: Batteries A Short Review Dr. Eng. Amr T. Abdel-Hamid NETW 1010 Fall 2013.](https://reader035.fdocuments.us/reader035/viewer/2022062314/56649d945503460f94a7c91e/html5/thumbnails/1.jpg)
Internet of Things:Batteries
A Short Review
Dr. Eng. Amr T. Abdel-Hamid
NETW 1010
Fall 2013
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Eradio Calculations
Eradio = (P(per Bit)* Number of Bits)+ (I sleep* V * T)
Total Energy used for this module
What kind of a battery needed then?!
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Battery (Short Review)
Duracell batteries 6v dry cell9v battery
More precisely
Two cells A real battery Another battery
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Batteries
Cheap Easy to use Rechargeable batteries available Lithium Ion batteries with high capacity Charging is simple and easy Size of batteries is a problem AA battery defines the size of many devices Environment (temperature) has influence on the
capacity
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Battery Characteristics
SizePhysical: button, AAA, AA, C, D, ... Energy density (watts per gram or cm3)
LongevityCapacity (Ah, for drain of C/10 at 20°C)Number of recharge cycles
Discharge characteristics (voltage drop)
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Further Characteristics
Cost Behavioral factors
Temperature range (storage, operation)Self dischargeMemory effect
Environmental factorsLeakage, gassing, toxicityShock resistance
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Battery Organization
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Battery Connections
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Primary (Disposable) Batteries
Zinc carbon (flashlights, toys) Heavy duty zinc chloride (radios, recorders) Alkaline (all of the above) Lithium (photoflash) Silver, mercury oxide (hearing aid, watches) Zinc air
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Alkaline Battery Discharge
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Secondary (Rechargeable) Batteries
Nickel cadmium Nickel metal hydride Alkaline Lithium ion Lithium ion polymer Lead acid
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Nickel Cadmium Batteries
Chemistry
Cadmium (-), nickel hydroxide (+)
Potassium hydroxide aqueous electrolyte Features
+ Rugged, long life, economical+ Good high discharge rate (for power tools)Relatively low energy densityToxic
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NiCd Recharging
Over 1000 cycles (if properly maintained) Fast, simple charge (even after long storage)
C/3 to 4C with temperature monitoring Self discharge
10% in first day, then 10%/mo
Trickle charge (C/16) will maintain charge Memory effect (Medium Effect over time)
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NiCd Memory Effect
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NiMH Battery Discharge
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NiMH Recharging
Less prone to memory than NiCd Shallow discharge better than deep
Degrades after 200-300 deep cycles
Need regular full discharge to avoid crystals Self discharge 1.5-2.0 more than NiCd Longer charge time than for NiCd
To avoid overheating
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NiCd v NiMH Self-Discharge
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Secondary Alkaline Batteries
Features50 cycles at 50% dischargeNo memory effectShallow discharge better than deeper
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NiCd v Alkaline Discharge
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Lithium Ion Batteries
Chemistry
Graphite (-), cobalt or manganese (+)
Nonaqueous electrolyte Features
+ 40% more capacity than NiCd+ Flat discharge (like NiCd)+ Self-discharge 50% less than NiCdExpensive
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Lithium Ion Recharging
300 cycles 50% capacity at 500 cycles
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Lithium Ion Polymer Batteries
Chemistry
Graphite (-), cobalt or manganese (+)
Nonaqueous electrolyte Features
+ Slim geometry, flexible shape, light weight+ Potentially lower cost (but currently expensive)+ Higher dischargeLower energy density, fewer cycles than Li-ion
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Battery Capacity
Type Capacity (mAh)
Density (mWh/g)
Alkaline AA 2850 124
Rechargeable 1600 80
NiCd AA 750 41
NiMH AA 1100 51
Lithium ion 1200 100
Lead acid 2000 30
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Discharge Rates
Type Voltage Peak Drain
Optimal Drain
Alkaline 1.5 0.5C < 0.2C
NiCd 1.25 20C 1C
Nickel metal 1.25 5C < 0.5C
Lead acid 2 5C 0.2C
Lithium ion 3.6 2C < 1C
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Recharging
Type Cycles (to 80%)
Charge time
Discharge per month
Cost per kWh
Alkaline 50 (50%) 3-10h 0.3% $95.00
NiCd 1500 1h 20% $7.50
NiMH 300-500 2-4h 30% $18.50
Li-ion 500-1000 2-4h 10% $24.00
Polymer 300-500 2-4h 10%
Lead acid 200-2000 8-16h 5% $8.50
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Energy harvesting Capacity of battery limits the lifetime of the device Battery depletion -> Device cannot work -> (Sensor) network
cannot work Idea: recharge the batteries during operation Use energy from the environment Current approaches
Photovoltaics: Solar modules for sensor nodes Thermoelectric generators
Conversion of temperature differences to energy Kinetic energy conversion
Piezo-electric principle already tested for shoes MEMS gas turbines
Convert air- or fluid streams