Charging and discharging standard lithium batteries at extremely low temperatures (below 0°C/32°F) can result in lithium precipitation that can ultimately lead to battery pack fires or explosions. However, lithium battery packs that are specially designed for low temperature operation not only prevent dangerous situations from occurring, they also improve overall battery pack performance and reliability in cold temperatures.
These specially customized battery packs are often used in commercial and industrial equipment, robotics, and marine monitoring systems that require charging and discharging in temperatures ranging from -5°C to -50°C (23°F to -58°F).
CMB’s battery packs that operate properly in low temperatures are equipped with special low temperature cells, insulation, heat storage technology, and heating pads. These features allow these battery packs to operate at an optimal temperature despite low temperature environmental surroundings, resulting in an improved and more reliable performance.
CMB utilizes the latest technology when it comes to our battery packs for cold temperatures, but it’s important to clarify the unique specifications of your application and its environment with our team during the design phase to ensure we can equip your low-temperature battery pack with the most ideal features for your situation.
Low Temperature Cell Specifications
At the heart of CMB’s customized battery packs that operate at low temperatures are specially crafted low-temperature cells. For each low temperature battery pack we design, we choose from three primary low temperature battery cells, all of which are detailed in the tables below.
Low Temperature 3.2V 18650 1600mAh LiFePO4 Cell Specifications
| Dimensions | Diameter | 18.3±0.2 (mm) |
| Height | 65.20±0.30 (mm) | |
| Capacity | 1600mAh | |
| Typical Voltage | 1550mAh | 0.5C discharge |
| Working Voltage | 2.0V to 3.65V | |
| Maximum Continuous Charge/Discharge | 1.6A/4.8A | |
| Cycle Life (25℃) | 7000 times（50% DOD） | |
| 4000 times（80% DOD） | The residual capacity is no less than 80% of rated capacity at 1C rate. | |
| 3500 times（100% DOD） | The residual capacity is no less than 80% of rated capacity at .0.5C/1C rate. | |
| 2000 times（100% DOD） | The residual capacity is no less than 80% of rated capacity at 1C rate. | |
| Working Temperature Range | Charge 0℃ to 60℃ Discharge -30℃ to 65℃ |
Low Temperature 3.2V 26650 3200mAh LiFePO4 Cell Specifications
| Dimensions | Diameter | 26.3 ± 0.2(mm) |
| Height | 65.7 ± 0.2 (mm) | |
| Capacity | 3200mAh | |
| Typical Voltage | 3150mAh | 0.5C discharge |
| Working Voltage | 2.0V to 3.65V | |
| Maximum Continuous Charge/Discharge | 9.6A/16A | |
| Cycle Life (25℃) | Discharge capability of 2001 cycles ≥80% | Original discharge capacity |
| Working Temperature Range | Charge -30℃ to 60℃ | |
| Discharge -50℃ to 60℃ | ||
| Temperature Discharge Performance | Discharge capability at −40℃ | ≥90% |
| Discharge capability at 25℃ | ||
| Discharge Rate Capability | Discharge capability at 3C | ≥96% |
| Discharge capability at 0.2C |
Low Temperature 3.7V 18650 2500mAh NCM Cell Specifications
| Dimensions | Diameter | ≤ 18.50 mm |
| Height | ≤ 65.30 mm | |
| Capacity | 2500mAh | |
| Typical Voltage | 2450mAh | 0.5C discharge |
| Working Voltage | 2.75V to 4.2V | |
| Maximum Continuous Charge/Discharge | 2.5A/25A | |
| Cycle Life (25℃) | 2.5A charge/ 10A discharge ≥500 cycles | |
| Working Temperature Range | Charge 0℃ to 45℃ | |
| Discharge -40℃ to 75℃ | ||
| Temperature Discharge Performance | Discharge capacity ≥80% | Rated capacity at-20℃ |
| Discharge capacity ≥70% | Rated capacity at-30℃ | |
| Discharge capacity ≥60% | Rated capacity at-40℃ |