Low-temperature lithium-ion battery, including low-temperature 18650 lithium-ion battery, low-temperature pouch polymer lithium-ion battery, and a low-temperature iron phosphate lithium-ion battery. Batteries these kinds, each low-temperature battery has its own advantages and disadvantages, so to say which low-temperature lithium-ion battery is better, according to The actual equipment application requirements, the next by the lithium-ion battery manufacturers to explain which is the best low-temperature lithium-ion battery.
What is a low-temperature lithium-ion battery?
Cryogenic lithium ion battery refers to the lithium ion battery that can work normally in the extremely low temperature environment. Cryogenic lithium ion battery has cryogenic 18650 lithium ion battery, cryogenic soft polymer lithium ion battery and cryogenic lithium iron phosphate battery. Battery these kinds. Low-temperature lithium-ion battery is widely used because of its light weight, high specific energy and long life and other advantages, low-temperature lithium-ion battery is a kind of Made of special materials and processes, suitable for use in cold environments below zero.
The low temperature lithium-ion battery is widely used in: military weaponry, aerospace, bomb-carrying equipment, polar science research, cold zone rescue. Power communication, public security, medical electronics, railways, ships, robots and other fields. It can be seen that the application of low temperature lithium-ion battery is more military industrialization, or we commonly say it is more “high and mighty” some, which is also We don’t see it often for a reason. It is generally required to work properly in an environment of about -40 degrees, with a discharge capacity of 80% or higher, and a minimum operating temperature of – 50°C.
Which is the best low temperature lithium ion battery?
1. Pouch low-temperature lithium polymer battery
Pouch cryogenic polymer Li-ion batteries should have the best low-temperature performance, especially in smart wearable devices. The advantage. Pouch cryogenic polymer Li-ion batteries can be shaped and sized to fit the space reserved for the device, fully enabling the device to achieve better Practical Use Requirements.
Grepow’s LiPo batteries can be made to operate in environments with low Under low-temperatures, the batteries can be used at temperatures of -50℃ to 50℃. Under low-temperatures, the batteries can achieve a lower internal resistance, and, Compared with traditional Lithium Polymer batteries, Grepow’s batteries have broken through the Discharge temperature limits of -20°C to 60°C.
They are able to discharge over 60% efficiency at 0.2C at -40°C and discharge over 80% efficiency at 0.2C at -30°C. When charged at 20°C to 30°C by 0.2C, the temperature of the battery will be lower than that of the battery. When charged at 20°C to 30°C by 0.2C, the capacity can maintain above 85% after 300 The batteries can be ready for mass production. production, and they have been widely used in cold climates and military products.
The thickness of Grepow low-temperature batteries can be made to range between 0.4 mm to 8 mm, and the width can come to be mm to 8 mm, and the width can come to be We have over 5,000 special-shaped batteries, and They come in a variety of sizes, shapes, and capacities.
2. Low temperature 18650 Li-ion battery
The low temperature 18650 lithium-ion battery is a fixed size cylindrical steel case lithium-ion battery, due to the cylindrical steel case 18650 The electrolyte used in batteries is liquid, so the discharge performance at lower temperatures is highly variable. In terms of applications, the range of use is relatively small due to the fixed performance and size of the battery, but its manufacturing cost is lower than that of a low-temperature battery. Polymer lithium-ion battery and low-temperature lithium iron phosphate batteries are both lower.
3. low temperature lithium iron phosphate battery
Low-temperature lithium iron phosphate batteries have two outsourcing forms, one is the steel case, which is currently mostly used in the field of new energy batteries; the other Is aluminum plastic film to do the outer packaging of soft pack lithium iron phosphate batteries, this type of battery performance is basically the same as the polymer lithium ion battery, knowledge in the The low temperature performance is better than 18650 lithium-ion battery, less than the pouch polymer lithium-ion battery, due to iron phosphate lithium-ion battery. It is less mature than the other two in terms of technology, and at the same time, the equipment requirements are higher in terms of manufacturing technology.
Grepow’s low-temperature LiFePO4 batteries ensure a great low-temperature discharge performance through the addition of functional materials into the electrolytes, as well as excellent technology that we have developed for a long time. The discharge current at 0.2C is over 85% of initial capacity at -20℃, 85% at -30℃, around 55% at -40℃.
What are the factors affecting the low temperature lithium-ion battery?
1. High-melting solvents
Due to the presence of high melting point solvents in the electrolyte mixture, the viscosity of lithium ion battery electrolyte increases in the low temperature environment, when the temperature is too low. electrolyte solidification occurs, resulting in a reduction in the transfer rate of lithium ions in the electrolyte.
2. SEI membrane
Under low temperature environment, the SEI film of the negative electrode of lithium ion battery thickens and the impedance of SEI film increases, resulting in the conduction of lithium ion in the SEI film. The rate decreases, and eventually lithium ion batteries are charged and discharged at low temperatures to form a polarization that reduces charge and discharge efficiency.
3. Anode structure
The three-dimensional structure of the anode material restricts the diffusion rate of lithium ions, especially at low temperatures. The discharge capacity of lithium iron phosphate battery at -20 ℃ can only reach 67.38% of the room temperature capacity, while the nickel-cobalt-manganese ternary battery Able to reach 70.1%. The discharge capacity of lithium manganese acid battery at -20℃ can reach 83% of the room temperature capacity.
To improve the performance of low temperature lithium ion battery, we should consider the influence of anode, cathode, electrolyte and other comprehensive factors in the battery. Through the optimization of the battery system as a whole, the polarization of the lithium ion battery under low temperature can be reduced, so that the low temperature performance of the battery can be further improved. If the lithium-ion battery is used at low temperature, the performance is poor no matter charging or discharging, and it may affect the service life, or it should be used at low temperature. Prevention.
If you are interested in our low temperature lithium batteries, please don’t hesitate to contact us at any time!
Email: info@grepow.com
Grepow Website: https://www.grepow.com/
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