Low Temp LiFePo4 Battery Introduction

author: LY-ON

2024-07-25

Battery is becoming one of the most important energy sources in the world. With Li technology development, they also enable electric vehicles to run, contributing to a more sustainable transportation system. Moreover, batteries are essential in many portable electronic gadgets and even in some medical devices.
Low temperature application is always the biggest challenge in the battery field, involves the electrochemistry, battery manage system and battery pack design.
At present, it has two search directions. One is to add the heating system to keep the cells in a nominal working temperature situation. Another is to develop the real low temp electrolyte to inject the cells. The second ones will the most reliable way to solute the lower temperature application, More engineers are researching to keep the balance between the high cost and lower capacity in the real world applications.

Now solemnly introduce Ly-On LiFePo4 26650 series cells. Their advantages are

A higher discharge rate in the lower temperature environment.
Still keep the long cycle life.
Real discharge and charge directly without a software BMS or heating film to heat up.

Cell Specification

Model	Voltage	Capacity	IR	Discharge Rate	Applied Temp.
IFR26650-LT3500	3.2V	3500mAh	≤25mΩ	1C	Discharge：-40℃~+60℃
IFR26650-LT3400		3400mAh	≤25mΩ	3C	Discharge：-50℃~+60℃ Charge: -30℃~+45℃
IFR26650-LT3200		3200mAh	≤25mΩ	5C
IFR26650-LT3000		3000mAh	≤25mΩ	10C

Performance

Discharge rate capacity

Temperature: 25±2℃

Charge: CC/CV to 3.65V at 0.5C current, Ending Current: 0.05C

Discharge: CC to 2.0V.

discharge capacity at 0.5Cdischarge capacity at 0.2C ≥98%

discharge capacity at 1.0Cdischarge capacity at 0.2C≥97%

discharge capacity at 3.0Cdischarge capacity at 0.2C≥96%

Cycle Life

Temperature: 25±2℃

Charge: CC/CV to 3.65V at 0.5C current, Ending Current: 0.05C. Rest time: 0.5h

Discharge: CC 0.5C to 2.0V. Rest time: 0.5h

discharge capacity of 1501th cycleoriginal discharge capacity

≥80%

Discharge Performance at different applied Temperature

Low Temperature Charge

After the discharge of the cell as be discharged to 2.00V at CC 1C under 25±2℃, the nickel sheet spot welding is used to weld the cell, and the test equipment is welded to the nickel sheet with two wires. It is placed in the low temperature environment for 16~24h, and the test point is sealed. After the current of 0.2C is constant current charging to the single cell voltage of 3.65V, it is converted to constant voltage 3.65V charging, and when the charging current is less than 0.05C, the charging stops

Low Temperature Discharge

After the battery is charged in accordance with be charged to 3.65V with 0.5C,and then, charged continuously with constant voltage of 3.65V until the charged current is 0.05C under 25±2℃, nickel spot welding is used to weld the battery core, and the test equipment is double-wire welded to the nickel sheet, which is placed in the low temperature environment for 16~24h. The test point is sealed, and the current of 1C is constant discharged to the minimum discharge voltage of the single cell.

According to the above low temperature test standard, discharge to 1.5V with 1C current

discharge capacity at-40℃discharge capacity at 25℃

≥90%

According to the above low temperature test standard, discharge to 2.0V with 1C current

discharge capacity at-20℃discharge capacity at 25℃ ≥90%

After charging as be charged to 3.65V with 0.5C, continuously to 3.65V until the charged current is 0.05C under 25±2℃ , discharge at constant current of 1C to 2.0V

discharge capacity at 60℃discharge capacity at 25℃ ≥98%

Discharge Curves at Different Temperature

Test condition

Charge fully CC/CV at 0.5C under 25℃
Rest 6h under -40℃/-30℃/-20℃/0℃/25℃/45℃. The relative test port does well the sealing.
Discharge to 2.0V/1.5V at 0.5C

Application:

Cold Chain Warehouse AGV

Snow Sports Equipment

Polar expedition

Welcome to contact us to get more information.

Robotic lawnmower battery

Warranty and Liabilities