LiFePO4 akku
LiFePO4 akku on syväpurkausakkujen uusinta teknologia.
Käyttökohteena on ajo-voima käyttö - sähköautot, -veneet, -trukit, ym sähköajoneuvot.
Toinen käyttöalue on aurinkovoimalan akkuvarasto.
Sama akkupaketti voi olla käytössä veneessä, mökillä ja kotonakin jossa se jaksaa pyörittää paitsi tietokonetta myös pesukonetta tai pölynimuria.
About LiFePO4 Battery
1. What is a Lithium iron phosphate battery?
The lithium iron phosphate (LiFePO4) battery is a type of rechargeable battery, specifically a lithium ion battery, which uses LiFePO4 as a cathode material.
2. What are the characteristics of LiFePO4 battery compared with other Lithium base batteries?
There are three types of lithium ion cells based on different cathode materials. They are lithium cobalt oxide, lithium manganese oxide and lithium ironphosphate types. Although lithium cobalt oxide cell has the advantage of high energy density, it suffers from safety concerns. Lithium manganese oxidecell has been evaluated for the application on high rate due to the better safety characteristics. However, its high temperature performance is the majordrawback. While Lithium iron phosphate cell has the best safety characteristics, long cycle life (up to 2000 cycles) and good availability. It has higherdischarge current, but has lower voltage and energy density than normal Li-ion cells. It is the safest and most suitable for high output usage. It is alsothe best for storage battery usage. It is not necessary to use the equalizer and the protecting PC Board module. Comparison Data among Various Lithium Base Batteries:
Battery
|
LiFePO4
|
LiCoO2
|
LiMn2O4
|
Li(NiCo)O2
|
Safety
|
Safest
|
Not Stable
|
Acceptable
|
Not Stable
|
Environmental concern
|
Most Enviro-friendly
|
Very Dangerous
|
Friendly
|
Very Dangerous
|
Cycle life
|
Best/Excellent
|
Acceptable
|
Acceptable
|
Acceptable
|
Power/Weight Density
|
Acceptable
|
Good
|
Acceptable
|
Best
|
Long Term Cost
|
Most Economic/Excellent
|
High
|
Acceptable
|
High
|
Temperature Range
|
Excellent (-20C to 70C)
|
Decay beyond (-20C to 55C)
|
Decay extremely fast over 50 C
|
-20C to 55C
|
In summary, the characteristics of lithium iron phosphate (LiFePO4) are as follows:
A) . The safest and the most environmental friendly
The Lithium Iron Phosphate Battery has been proven as the most environmental friendly battery. The primary concern with Li-Ion batteries is safety.Overcharging and overheating can cause fire and explosions. The exception to this is the LiFePO4 battery.
B). Fast "forced" charging
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 get100%SOC. This is similar to the way lead acid batteries are safely force charged.
C). Large overcharge tolerance and safer performance
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.
D). Higher energy density
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 than145Ah/kg. Therefore, the gravimetric energy density of LiFePO4 battery is 130Wh/kg,
E). 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 theircost.
F). 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.
G). 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.
H). What are the main applications of the lithium iron phosphate (LiFePO4)?
Due to the characteristics of lithium iron phosphate (LiFePO4), it is very suitable for high discharge rate occasions such as EV (including e-bike, electricscooter, and electric car), power tools (for example, electric drill, electric motor saw, cropper), UPS and emergency lighting, solar energy system.According to different applications, the design of battery pack can be modified to provide the best solution to satisfy the customer’s needs