Original Grade A+ EVE MB31 314ah 8000 Cycles LFP LiFePO4 Cell Lithium Battery Iron Phosphate

Original Grade A+ EVE MB31 314ah 8000 Cycles LFP LiFePO4 Cell Lithium Battery Iron Phosphate

NOTES:

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.

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.

Since 2010, we've been one of the largest wholesalers of rechargeable batteries.

We solely focus on high - quality, grade A, brand - new batteries.

Our range includes LiFePO4, LTO, Sodium, solid - state batteries, and other trending ones.

Both cylindrical and prismatic cells are available, with capacities from 1300mAh to 320Ah.

These batteries are mainly for EVs and residential energy storage.

We have warehouses in Poland, the USA, and China.

This enables customers to select high - quality products and avoid poor - quality batteries.

It also allows us to deliver products quickly.

Moreover, we have a battery pack factory that supports design, OEM, and customization like 12V, 24V, 48V, etc.

We are an honest team.

Trust our 14 - year experience to help you achieve great success.

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