BHL18650-3500-ULT Ultra-Low Temperature Lithium-Ion Cell | Features & Applications
Ⅰ. Core Product Advantages
1. Extreme Full-Range Wide Temperature, Charging down to -40℃ & Discharging down to -50℃
Operating temperature limits: charging from -40℃ to 40℃, discharging from -50℃ to 55℃. Featuring industry-leading ultra-low-temperature charging capability, the cell retains ≥95% capacity at 55℃ high temperature, delivers full rated capacity at room temperature and maintains 95% capacity at 0℃. It performs stably under -50℃ extreme cold conditions with a low-temperature discharge cut-off voltage of 2.3V. No external heating or heat dissipation modules are required, greatly simplifying the thermal control structure of polar and high-latitude extreme cold equipment. It supports direct charging and discharging at -40℃~-50℃, perfectly adapting to unmanned devices operating in polar regions and high-altitude frigid environments.
2. 3500mAh Large Capacity & 5C High-Rate High Power Output
The 3500mAh ultra-high capacity effectively extends single-operation endurance of equipment. The cell supports 5C continuous discharge with a maximum continuous current of 21A and an instantaneous peak current of 42A, fully meeting the instantaneous high-power startup requirements of various devices. With optimized internal conductive structure, the cell surface temperature is controlled below 60℃ during charging and ≤70℃ during discharge. It resists accelerated aging under long-term high-load operation, making it ideal for high-power low-temperature equipment.
3. Stable Cycle Performance & Ultra-Low Self-Discharge for Maintenance-Free Long-Term Storage
The cell delivers excellent cycle stability under standard operating conditions and retains ≥85% residual capacity after 30-day full-charge static storage at room temperature with ultra-low self-discharge rate. For long-term storage, a 10%~35% state of charge is recommended. When stored in dry environments at -20℃~45℃, only supplementary charging is required after 12 months. It is highly suitable for long-term sealed field equipment and unattended monitoring devices, significantly reducing inspection and replacement costs.
4. Full-Range Safety Certification with Zero Thermal Runaway at All Temperatures
The cell has passed comprehensive safety tests including overcharge, deep overdischarge, external short circuit, 135℃ thermal shock, high-low temperature cycling, three-axis swept vibration and six-direction drop, with zero fire or explosion throughout all tests. The integrated steel shell provides outstanding extrusion and impact resistance. Matched with dedicated protection circuits, it achieves triple protection against overcharge, overdischarge and overcurrent, complying with high safety standards for military-grade and polar special equipment.
5. Superior Weather Resistance & Standardized PACK Design
After 10~55Hz three-axis vibration, 1-meter six-direction drop and 40℃/95% RH long-term damp-heat tests, the cell presents no deformation or liquid leakage and retains over 95% capacity. The customized blue low-temperature resistant sleeve features anti-freezing and UV-resistant properties. Cells from the same batch deliver voltage difference ≤20mV, internal resistance difference ≤6mΩ and internal pack temperature deviation ≤5℃. Adopting universal 18650 specifications with 100pcs inner box and 200pcs outer box shockproof packaging, the cell supports only resistance welding and laser welding. Flexible series-parallel configuration requires no customized molds, ensuring high-efficiency mass assembly production.
Ⅱ. Industry Application Scenarios
Polar & High-Latitude Scientific Research Special Equipment：Suitable for polar exploration instruments, high-altitude cold-region monitoring terminals and -50℃ field acquisition equipment. It supports direct charging and discharging at ultra-low temperatures without heating devices, enabling stable long-term unattended operation.
Cold-Region High-Power UAVs & Communication Devices：Ideal for extreme cold surveying aircraft, high-power border radio stations and outdoor Beidou positioning terminals. 5C high-current output guarantees stable takeoff and signal transmission without sudden power failure in ultra-low-temperature environments.
Ultra-Low-Temperature Individual Emergency Equipment：Applied to extreme cold rescue power supplies, low-temperature high-power lighting and border field startup devices. The 42A instantaneous peak current ensures reliable power output for long-term field duty in severe cold environments.
Northern Industrial Low-Temperature High-Power Equipment：Perfect for high-altitude factory power tools, underground low-temperature detectors and cold-chain high-power AGVs. The wide-temperature adaptability suits various low-temperature working scenarios including workshops, cold storage and outdoor environments.
Extreme Cold Outdoor Energy Storage Systems：Applicable to extreme cold camping energy storage, northern RV parking power supplies and low-temperature vehicle-mounted emergency starting power. The large capacity extends endurance while ensuring stable charging and discharging performance in sub-zero environments.
Ⅲ. Product Summary
The BHL18650-3500-ULT features core competitive advantages of -50℃ ultra-low-temperature discharge, -40℃ low-temperature charging, 3500mAh large capacity and 5C high-rate output. It also integrates six key strengths: 264Wh/kg high energy density, reliable cycle life, full-range safety protection, superior extreme cold weather resistance, excellent batch consistency and universal standard dimensions. Custom-developed for high-power special equipment operating in polar and high-latitude extreme cold regions, it is equipped with complete charge-discharge specifications, professional PACK assembly guidelines and one-year process warranty, serving as the optimal cell solution for ultra-low-temperature high-power lithium power systems.
