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How 18V 24V, 36V, 48V, 60V, 72V Li ion Battery Composed?

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Feb 11, 2019

How 18V, 24V, 36V, 48V, 60V, 72V Li ion Battery Composed?


Introduction:

First of all, What does Li ion Battery Composed of? Lithium batteries are mainly composed of two parts, the battery cell and protective board PCM (power battery is generally called battery management system BMS), the battery cell is equivalent to the heart of lithium batteries, and the management system is equivalent to the brain of lithium batteries.


Secondlly, what's the advantage and disadvantage of li ion battery?

The disadvantage of lithium batteries is that the price is relatively high, the temperature range is relatively narrow, and there are some potential safety hazards (protection system needs to be added).


Lithium batteries have many advantages, such as high voltage platform, high energy density (light weight, small volume), long service life and environmental protection.


Well, more and more electric bicycle and motorcycle systems are generally using 24V, 36V, 48V, 60V, 72V li ion battery powered systems. Battery groups in series and parallel connection need to consider many things, such as the consistency of battery voltage platform, the consistency of battery capacity, and the consistency of battery internal resistance.


The consistency of battery parameters after series-parallel connection has a great influence on battery performance and life. Let's make a comparison as below:

Battery Pack VoltageLithium Manganate/Lithium Ternary    Lithium Ferrophosphate
12V4S4S
18V5S6S
24V7S8S
36V10S12S
48V13S15S/16S
60V16S19S
64V18S20S
72V20S23S

thus, we can find lithium Ferrophosphate battery need more batteries in seriese connection to make same voltage battery output. as we mentioned above, more series-parallel connection will have a great influence on battery performance and life.


Comparison on battery raw material chemistry:

Due to the particularity of power batteries, there are also some differences in technology and materials. According to the situation of cathode materials, they are mainly divided into lithium manganate (LiMn2O4), lithium ternary (LiNixCoyMnzO 2), lithium iron phosphate (LiFePO4) and so on. Their voltage platforms, energy density, price, safety and so on have certain differences. See the comparison of the table below specifically:

No.ParamaterLCNCMLMOLFO
1energy desisty(g/cm3)2.8~3.02.0~2.32.2~2.41.0~1.4
2surface square(m2/g)0.4~0.60.2~0.40.4~0.812~20
3capacity energy(Ah/kg)135~140155~165100~115130~140
4voltage platform(V)3.73.63.63.2
5cycle performance>300>800>500>2000
6transport mettalPoorPoorRichVery Rich
7Raw materialSuper highhighCheapCheap
8Eco EnvirionmentNicelNicel+CobaltNon toxicNon toxic
9Safety PerformancePoorBetterGoodSuper
10Application Small batterySmall battery/less power batterypower batterypower battery/super capacity battery

thus, we can find NCM, LMO, LFP chemitry battery has better overall performance.


What can SINOLI battery for for you?

SINOLI BATTERY is a professional lithium ion battery manufacturer in China since 2015. we can make batteries according to your system and save cost as per your needs. to make your customer love your brand is what we always do. SINOLI offer the full set of battery service, from regulation to production to transport to marketing etc.