Low temperature lithium battery is a kind of lithium metal battery, and its operating temperature is - 20 ° C to 60 ° C. It can work normally at low temperature, but its charging and discharging efficiency is low. It has the advantages of small volume, high specific energy, good cycle performance and low cost.
Low temperature lithium battery is made of special materials and processes. It is suitable for use in cold environments below zero, and its discharge capacity and working performance are excellent. Generally, it is required to work normally in an environment of about - 40 ℃. Its discharge capacity is kept above 80%, and the minimum working temperature can reach - 50 ℃.
The low temperature lithium battery uses VGCF and activated carbon with a specific surface area of (2000 ± 500) ㎡/g as additives and their matching positive and negative electrode materials. The special electrolyte added with special additives is injected to ensure the low temperature discharge function of the lithium battery. At the same time, the volume change rate of the lithium battery after 24h storage at 70 ℃ is ≤ 0.5%, which has the safety and storage functions of conventional lithium batteries.
Type of low temperature lithium battery:
Low temperature lithium batteries are divided into three series according to their service environment: civil low-temperature batteries, special low-temperature batteries, and extreme environmental low-temperature batteries:
1. Civil low-temperature lithium battery: 0.2C discharge of - 20 ℃ battery accounts for more than 90% of the rated capacity- The 0.2C discharge of the battery at 30 ℃ accounts for more than 85% of the rated capacity;
2. Special low temperature lithium battery - 40 ℃ battery 0.2 discharge accounts for more than 80% of the rated capacity;
3. The 0.2 discharge of low temperature lithium battery in extreme environment accounts for more than 50% of the rated capacity at - 50 ℃;
Application of low temperature lithium battery:
Low temperature lithium batteries have been widely used due to their advantages of light weight, high specific energy and long life. They are suitable for use in below zero cold environments, and are commonly used for power supply of equipment troops, aviation, aerospace, deep-sea diving equipment, polar scientific research, exploration equipment, cold belt rescue, power supply for disaster relief, cold clothing, and cold shoes.
