Description
3500mAh Ultra-Low-Temperature 26650 Lithium Iron Phosphate (LFP) Cylindrical Battery (4-Pack)COMMERCIAL GRADE · PRODUCTION
|
|||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||
|
TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
EMAIL: inquiry@atomfair.com
|
|||||||||||||||||||||||||||||||||||||||||||||||||||
|
Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
|
|||||||||||||||||||||||||||||||||||||||||||||||||||
This cell must be charged within -20°C to 55°C and discharged within -40°C to 60°C. A low-temperature BMS is required to prevent charging below safe temperature limits.
- Charge Voltage Limit: The maximum charge voltage must not exceed 3.65±0.03V to prevent overcharge degradation.
- Discharge Voltage Limit: The minimum discharge voltage is 2.00V above -20°C and 1.50V at or below -20°C to avoid irreversible capacity loss.
- Temperature-Dependent Charge Current: The charge current must be reduced to 0.2C at -20°C and 0.5C at temperatures between -10°C and 0°C to ensure safe operation.
- Storage and Transport: Cells must be stored in anti-static trays with insulated terminal covers to prevent short circuits and mechanical damage.
- BMS Integration: A low-temperature BMS must enable charging only when the cell temperature is within the safe charge range.
Follow these steps to initialize and safely charge the battery pack at sub-zero temperatures. Proper setup ensures optimal performance and prevents damage.
Required Equipment: Low-temperature BMS, CC-CV charger
- Inspect Packaging
Inspect the packaging and verify that terminal insulation covers are intact. - Connect BMS
Connect the cell pack to a low-temperature BMS that disables charging below -20°C. - Set Charger Profile
Set the charger to a CC-CV profile with a maximum charge current of 0.2C at -20°C. - Confirm Temperature
Confirm that the cell temperature is above -20°C before initiating the charge cycle. - Monitor Voltage
Monitor the charge voltage to ensure it does not exceed 3.65V during the constant-voltage phase.
Why does the minimum discharge voltage change from 2.00V to 1.50V when operating below -20°C?
At temperatures of -20°C or lower, increased internal resistance causes a higher voltage drop under load, requiring a lower cutoff voltage to extract usable capacity. The cell is rated to deliver >70% of nominal capacity at -40°C down to 1.50V, whereas above -20°C the cutoff is 2.00V to maintain standard protection thresholds. This trade-off maximizes low-temperature energy delivery without prematurely ending discharge.
What BMS specifications are critical for integrating this cell into a cold-climate energy storage system?
A low-temperature battery management system (BMS) that monitors cell temperature and prevents charging below -20°C is mandatory. The cell will not accept charge below this threshold, and forcing charge can cause irreversible damage. The BMS must also enforce the reduced charge current limits: ≤0.2C at -20°C, 0.5C between -10°C and 0°C, and 1.0C above 0°C.
What are the safe temperature limits for charging and discharging this cell, and what performance can be expected at the extremes?
Charging is allowed from -20°C to 55°C; the cell will not accept charge below -20°C. Discharging is permitted from -40°C to 60°C with >70% capacity retention at -40°C and >75% at -20°C. Exceeding these temperature limits may cause permanent capacity loss or internal damage, so a BMS that enforces these ranges is essential.
This 26650 LFP cell provides reliable operation at -20°C with direct charging capability, but requires careful current management and BMS integration for optimal performance and safety.
Positive
- Direct sub-zero charging without pre-heat: Capable of charging at temperatures as low as -20°C without external heating, eliminating need for battery warmers in cold environments.
- High energy density and cycle life: 128 Wh/kg energy density enables compact pack design, while 1500 cycles at 80% DOD ensures long operational life for stationary and mobile applications.
Trade-offs
- Reduced charge current at low temperatures: Maximum charge current is limited to 0.2C at -20°C and 0.5C at ≤0°C, requiring extended charging times or lower-power profiles in cold conditions.
- Charge temperature floor at -20°C: Cell will not accept a charge below -20°C; a low-temperature BMS monitoring cell temperature is required to prevent unsafe charging attempts.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
