LFP battery pack VS NMC batteries Difference to use in Solar generator
1、Performance comparison of NMC and LFP batteries: LFP batteries:Nominal Voltage 3.2-3.3V
LFP batteries’s advantages:Long-life Span ,excellent performance of over charge and over discharge .
NMC batteries’s advantages:High energy density，Good performance for Low temperature， Small volume，Good discharging liner performance.
LFP batteries’s disadvantages:Big size，heavy，Middle discharging liner performance，Middle performance for Low temperature.
2、Performance comparison of NMC batteries and LFP batteries:Low temperature performance.
LFP batteries’s low temperature performance is not that good.Under 0-5°C in the winter，LFP batteries’s working efficiency is about 75% of summer’s.In the condition of high power and high current，it’s working efficiency is getting more low。At the same temperature，NMC batteries’s working efficiency is 90% of summer’s.The efficiency also getting low，but not that serious.。It depends on the weather,so it’s very necessary for different area customer to consider the weather condition while choosing LFP batteries’s material。
3、Performance comparison of MNC and LFP batteries :Discharge liner performance. Discharge liner performance that means，the relation between residual electricity and voltage.Base on LFP batteries’s feature，discharge is with high voltage area ，platform voltage area and low voltage area.And the voltage reduces very fast in the area of high and low voltage area ,then reduces very slowly in the area of platform voltage area.So you can see the voltage drops very fast at the fist use of a full charge batteries ，it drops slowly when gets into platform voltage
area ,After releasing about 80%-90% capacity，It gets into the low voltage area.On the positive side，the main discharge area is very gentle.On the negative side,It’s difficult for users to judge the amount of residual electricity according to the voltage display data.
Base on normal temperature 25°C，LEP batteries and NMC batteries’s is very close at high temperature 55°C and at normal temperature 25°C.But under -20°C，NMC batteries is better than LEP batteries.
Over charge and over discharge function.
One of the major advantages of LFP batteries is to withstand over charge and over discharge.General speaking，it’s not very dangerous for LFP batteries to overcharge up to 5V in a short time. It makes little impact to performance even release excess electricity immediately。
For Mn-Zn batteries，there will be obvious over charge reaction while up to 5V，and it cause great damage to the electric core also.LFP batteries can be restored at 0V during overcharge (performance may getting low)，but NMC batteries will be scrapped at 0V.In summary，LFP batteries has better overcharge and over discharge performance.Actually，because the steep curve of LFP batteries in high and low voltage area，even a small amount of electricity can cause a significant change in voltage。The facts are just the opposite of what they literally mean.。For example，LFP batteries and NMC batteries with the same capacity,Under the condition of full charge, charge test is done in series.Voltage of LEP batteries will rise very quickly，and the Mn-Zn series will be scrapped;Same as over discharge testing,If it’s a single batteries ,the limited of over discharge is 0V，In actual batteries, excessive 0 V will not stop, and the batteries will quickly become negative pressure leading to scrap.
4、Comparative analysis of charge and discharge efficiency of LPF VS NMC battery
|According to the form, we can see when charging in 10C condition, the constant current rate of NMC and LFP are almost similar. But when higher than 10C, the LFP constant current rate and|
are dropping very fast.
5、Performance parameter comparison of NMC and LFP: energy density.
The energy density of LFP is about 90-120Wh/kg, and NMC is about 200Wh/kg. NMC has more advantages than LFP. The volume is a big disadvantage of LFP. In the same dimension, if LFP is 10AH, then NMC can be over than 15AH. This is a very big difference of big generator battery pack.
6、Performance parameter comparison of NMC and LFP:Life cycle LFP: Keep 80% after 2500 cycles;
NMC: Keep 80% after 1000 cycles
7、Safety comparison of NMC and LFP.
In terms of material system, the decomposition temperature of the NMC cathode material is around 200°C, LFP is 700°C. Short-circuit LFP cells in the laboratory test environment, basically
no fire occurs, but NMC may yes. NMC has higher requirements on thermal management. For vehicle battery pack, it’s more safety as with BMS management,the battery can work in a very good condition.
The advantages and disadvantages of NMC and LFP in generator battery pack: NMC has more advantages on energy efficiency、power、large rate charging、 low temperature performance etc. But LFP is better in cycle life and safety.
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