PowerStream Power supplies, battery chargers, batteries and packs, dc/dc converters, injection molding View Shopping Cart
 

Lithium Iron Phosphate High Capacity Rechargeable Lithium Ion Batteries

Due to limited resources we cannot accept new customers for these cells, sorry. (Except for 12V 55AH packs, click here)


12 volt large lithium ion packs from PowerStream with high capacity and high power
12 Volt high-power, high capacity lithium iron phosphate packs
24 Volt large lithium ion cells from PowerStream with high capacity and high power
24 Volt high-power, high capacity lithium iron phosphate packs
large lithium ion cells from PowerStream with high capacity and high power
36 Volt high capacity lithium iron phosphate packs
large lithium ion cells from PowerStream with high capacity and high power
48 Volt lithium iron phosphate packs
Lithium Iron Phosphate batteries for sale
Lithium Iron phosphate batteries are safer than Lithium-ion cells, and are available in a range of cell sizes between 5 and 100 AH with much longer cycle life than conventional batteries.

For more battery resources from PowerStream click here: More DC/DC Converters

Custom design and manufacture of state-of-the-art battery chargers, UPS, and power supplies for OEMs in a hurry!




These li-ion cells and batteries not only have high capacity, but can deliver high power. High-power lithium iron phosphate batteries are now a reality. They can be used as storage cells or power sources.

In addition, Lithium Iron Phosphate batteries are among the longest lived batteries ever developed. Test data in the laboratory show up to 2000 charge/discharge cycles.

All of the following products are available by special orer. Chargers and battery management boards are available. We are now offering total turn-key solutions for almost any capacity and voltage made of the following building blocks. Delivery is typically 4 weeks.


Following are the cells that are available. However, it is best to buy the cells already built into packs because the cells need matching and the packs need battery managment boards.

List of LiFePO4 Cells

NO.

Single Cell Model

Nominal capacity

Nominal voltage  

Dimensions

Weight

Internal Impedance

Thickness

Width

Length

(Ah)

(V)

(±1mm)

(±1mm)

(±2mm)

(Kg)

(mOhm)

1

LFP3.7S

3.7

3.2

12

35

130

0.15

30

2

LFP4S

4

3.2

20

70

78

0.15

30

3

LFP5S-1

5

3.2

23

51

73

0.2

20

4

LFP5S-2

5

3.2

21

72

78

0.2

30

5

LFP9S

9

3.2

34

56

82

0.35

20

6

LFP10S-1

10

3.2

27

80

105

0.4

15

7

LFP10S-2

10

3.2

23

100

99

0.4

15

8

LFP20S-1

20

3.2

45

75

121

0.7

15

9

LFP20S-2

20

3.2

30

100

160

0.8

8

10

LFP55S

55

3.2

45

120

190

2.1

8

11

LFP110S

110

3.2

90

120

190

4.2

10

 

 

Available Packs
Voltage    
12 Volts Click here for 12 volt lithium iron phosphate packs and chargers  
24 Volts Click here for 24 volt lithium iron phosphate packs and chargers  
36 Volts Click here for 36 volt lithium iron phosphate packs and chargers  
48 Volts Click here for 48 volt lithium iron phosphate packs and chargers  

Lithium Iron Phosphate Parameters      
Nominal voltage 3.2 Volts    
Peak voltage 3.65 Volts    
Absolute Minimum discharge voltage 2.0 Volts    
CV charge voltage 3.65 Volts 100% charge  
CV charge voltage 3.5 Volts 95% charge  
Charge Temperature 0°-40°C    
Discharge Temperature -10°-60°C    
   LiFePO4 Battery Category

Innovation in Li-ion Battery:
LiFePO4 Power Battery, Faster charging and safer performance

      Although small capacity Li-ion (polymer) Battery containing lithium cobalt oxide (LiCoO2) offers a the best mass energy density and volume energy density available, lithium cobalt oxide (LiCoO2) is very expensive and unsafe for large scale Li-ion Batteries.

Recently lithium iron phosphate (LiFePO4) has been becoming the "best-choice" of materials in commercial Li-ion (and polymer) batteries for large capacity and high power applications, such as laptops, power tools, wheel chairs, e-bikes, e-cars and e-buses.

The LiFePO4 battery has hybrid characters: it is as safe as the lead-acid battery and as powerful as the lithium ion battery. The advantages of large format Li-ion (and polymer) batteries containing lithium iron phosphate (LiFePO4) are listed as below:


      1. Fast "forced" charging:
      During the charging process, a conventional Li-ion Battery containing lithium cobalt oxide (LiCoO2) needs two steps to be fully charged: step 1 uses constant current (CC) to get 60% State of Charge (SOC); step 2 takes place when charge voltage reaches 4.2V per cell, which is the upper limit of safe charging voltage. Turning from constant current (CC) to constant voltage (CV) means that the charge current is limited by what the battery will accept at that voltage, so the charging current tapers down asymptotically. To put a clock to the process, step 1 (60%SOC) needs a minimum of two hours and the step 2 (40%SOC) needs another two hours. Because an overvoltage can be applied to the LiFePO4 battery it can be charged by only one step of CC to reach 95%SOC or be charged by CC+CV to get 100%SOC. This is similar to the way lead acid batteries are safely force charged. The minimum total charging time will be about two hours.

      2. Large overcharge tolerance and safer performance
      A LiCoO2 battery has a very narrow overcharge tolerance, about 0.1V over the 4.2V per cell charging voltage plateau, which also the upper limit of the charge voltage. Continuous charging over 4.3V would either damage the battery performance, such as cycle life, or result in fire or explosion.

A LiFePO4 battery has a much wider overcharge tolerance of about 0.7V from its charging voltage plateau of 3.5V per cell. When measured with a differential scanning calorimeter (DSC) the exothermic heat of the chemical reaction with electrolyte after overcharge is only 90 Joules/gram for LiFePO4 versus 1600 J/g for LiCoO2 . The greater the exothermic heat, the more vigorous the fire or explosion that can happen when the battery is abused.

A LiFePO4 battery can be safely overcharged up to 30V without protection circuit board. It is therefore suitable for large capacity and high power applications. From the viewpoint of large overcharge tolerance and safety performance, a LiFePO4 battery is similar to a lead-acid battery.

      3. Self balance
     Unlike the lead-acid battery, a number of LiFePO4 cells in a battery pack in series connection cannot balance each other during charging process. This is because the charge current stops flowing when the cell is full. This means that the LiFEPO4 packs need management boards.


      4. Four times higher energy density than Lead-acid battery
     
Lead-acid battery is an aqueous system. The single cell voltage is nominally 2V during discharge. Lead is a heavy metal, its specific capacity is only 44Ah/kg. In comparison, the lithium iron phosphate (LiFePO4) cell is a non-aqueous system, having 3.2V as its nominal voltage during discharge. Its specific capacity is more than 145Ah/kg. Therefore, the gravimetric energy density of LiFePO4 battery is 130Wh/kg, four times higher than that of Lead-acid battery, 35Wh/kg.



    5. Simplified battery management system and battery charger

      Large overcharge tolerance and self-balance characteristic of LiFePO4 battery can simplify the battery protection and balance circuit boards, lowering their cost. The one step charging process allows the use of a simpler conventional power supplier to charge LiFePO4 battery instead of using an expensive professional Li-ion battery charger.


      6. Longer cycle life
      In comparison with LiCoO2 battery which has a cycle life of 400 cycles, LiFePO4 battery extends its cycle life up to 2000 cycles.


      7. High temperature performance
      It is detrimental to have a LiCoO2 battery working at elevated temperature, such as 60°C. However, a LiFePO4 battery runs better at elevated temperature, offering 10% more capacity, due to higher lithium ionic conductivity.



Advantages:

OEM Battery Chargers State of the art lithium-iron-phosphate packs cell with laser welded stainless steel cases, no polymer, rubber, or plastic seals.

Universal Power Input OEM Power Supplies and OEM Battery Chargers High Discharge rates

Universal Power Input OEM Power Supplies and OEM Battery Chargers Cycle life 1000 to 2000 cycles.

Universal Power Input OEM Power Supplies and OEM Battery Chargers Much safer than any other lithium ion technology


[Home] [PowerStream] [Site Map] [Tech Resources]
  [Policy and Privacy] [Contact Us]

Google Author VerificationTuesday, 18-Jun-2013 03:25:58 EDT

PowerStream Technology: 1163 S. 1680 West. Orem Utah 84058
Phone: 801-764-9060
Fax: 801-764-9061

© Copyright 2000, 2002, 2003, 2004, 2005, 2006, 2008,2009, 2010, 2011, 2012, 2013 Lund Instrument Engineering, Inc. All rights reserved. by Mark W. Lund