Original Grade A+ EVE MB31 314ah 8000 Cycles LFP LiFePO4 Cell
Lithium Battery Iron Phosphate
NOTES:
MB31 EVE 314ahThis EVE 314ah is M6 Stud type,comes with free busbars
| Rated capacity | 314Ah |
| Rated voltage | 3.2V |
| Voltage range | 2.5V-3.65V |
| Cycle life | 8000 cycles,25 ℃ 70% SOH |
| Max charge current | 0.5C,157ah |
| Max discharge current | 0.5C,157ah |
| Initial internal resistance | 0.18mΩ±0.05mΩ |
| Weight | 5.6KG±0.3KG |
| size | 174*72*205mm |
| Discharging temperature | -30-60℃ |
Deligreen is EVE authorised distributor who supply Grade A+
original MB31 EVE 314ah lithium batteries.
Original QR code,not tampered and scratched.
EVE Authorization
Difference of Grade A and Grade A+
Grade A lithium is unqualified Grade A+ battery.Lithium battery
manufacturers have a defect rate when producing lithium batteries,
including poor appearance, insufficient capacity, high internal
resistance, abnormal voltage, etc.These batteries cannot be sold to
his customers normally by the manufacturer, but they can be used as
energy storage batteries.
Good suppliers will classify these A-grade batteries and conduct
capacity tests, which will affect the final selling price of the
batteries. Some suppliers do not conduct any testing and sell these
batteries directly to customers, which is why you may receive
batteries with different voltages or capacities insufficient. Of
course, the price of these batteries is also very attractive.
There is a certain probability that grade A batteries may have the
following problems: the voltage of one battery cell rises and falls
faster than other batteries, bulges,unbalanced.
| Grade A | Grade A+ |
| Battery Grade Level | Unqualified EV battery | Qualifeid EV battery |
| QR code | Scratched or Tampered | Qriginal QR code |
| Capacity test | Needed | No Need |
| Matching | Not Matched | Batch Matched |
| Voltage difference | Potential | No |
| Swelling | Potential | No |
| Advised Voltage | Lower than 32S 96V | No limitation |
| Test Report | No | Factory report |
| Cost | cheaper | Higher than Grade A |
VAT invoice for company
Deligreen is able to supply EU VAT number and legal invoice for VAT
refund.The price is with tax 19%-23% based on
our wholesale price.
Austria: 20% Belgium: 21% Bulgaria: 20% Croatia: 25% Cyprus: 19%
Czech Republic: 21%
Denmark: 25% Estonia: 20% Finland: 24% France: 20% Germany: 19%,
Greece: 24%
Hungary: 27% Ireland: 23% Italy: 22% Latvia: 21% Lithuania: 21%
Luxembourg: 17%
Malta: 18% Netherlands: 21% Poland: 23% Portugal: 23% Romania: 19%
Slovakia: 20%
Slovenia: 22% Spain: 21% Sweden: 25%
This item is EVE Lifepo4 3.2V 314Ah item,QR code, Grade A+, Brand
new.
Internal resistance
Stacking cells have lower internal resistance,winding cells have
related higher IR.
Winding cell is usually a single pole ear, while a stacking cell
can be seen as a multi pole ear, greatly reducing its internal
resistance.
The different internal resistances result in different heat
generation and capacity decay rates during the charging and
discharging cycles
of finished batteries. It is evident that stacked batteries have
slower capacity decay.
Cycle life
For stacking batteries, the internal temperature distribution is
relatively uniform,Due to the unidirectional heat transfer between
the electrode and the
separator, the temperature gradient distribution of the winding
battery is relatively severe, resulting in high internal
temperature and low external temperature.
Uneven temperature distribution leads to the deactivation of active
substances at high temperature positions during the charging and
discharging process of the
battery, which prevents the function of lithium ion deintercalation
and affects the rapid decay at other positions, thereby affecting
the performance of the battery.
The internal stress of the battery cell
The edge of a winding battery cell is where stress is concentrated.
Based on past battery disassembly analysis experience, the bending
of the electrode is more prone to
micro short circuits, electrical breakdown, and lithium
deposition.The stress concentration point is the primary location
for battery deactivation, which also leads to a decrease
in the cycle life of wound batteries.
Charging&Discharging rate
The stacking cell is equivalent to parallel connection of multiple
electrodes, making it easier to complete high current discharge in
a short period of time, which is beneficial for the rate
performance of the battery. The winding process, on the other hand,
is exactly the opposite, with a single pole ear resulting in
slightly poorer rate performance.
Battery capacity density
Stacking batteries have a higher capacity density because their
internal space is more fully utilized.
The winding type battery has circular cells on both sides and the
last two layers of membranes occupy a certain thickness, resulting
in a lower capacity density.
