Military battery|Military Low Temperature Lithium Battery Standard
Are lithium batteries afraid of low temperatures? Military low temperature lithium battery standard. Among all environmental factors, temperature has the greatest impact on the charge-discharge performance of the battery, and the electrochemical reaction at the electrode/electrolyte interface is related to the ambient temperature. At present, the low-temperature lithium battery used in the military works at a temperature of -50 ℃ at a minimum. However, due to the special use environment, the standard of low-temperature lithium battery used in the military must adapt to certain conditions.
Lithium batteries have the characteristics of large storage capacity, stable operation, and basically no memory effect. They also have advantages in adapting to ambient temperature. Taking lithium thionyl chloride batteries as an example, the working temperature can be in the range of -40°C to +55°C. Of course, when the temperature drops to minus 40 degrees, the capacity will also change, which is 50% of the normal temperature. It shows that low temperature has a great impact on lithium batteries, so they should be stored and used at room temperature as much as possible.
The use of lithium batteries in a low temperature environment is limited. In addition to the serious decline in discharge capacity, lithium batteries cannot be charged at low temperatures. The intercalation and plating reactions of lithium ions on the graphite electrode of the battery are simultaneous and competing with each other during low-temperature charging. At low temperature, the diffusion of lithium ions in graphite is inhibited, and the conductivity of the electrolyte decreases, which leads to a decrease in the intercalation rate and makes the lithium plating reaction more likely to occur on the graphite surface.
Under low temperature conditions, the power of lithium batteries is easily exhausted, and the battery storage at this time is only about 70% of that at room temperature. When shooting outside the camera, prepare a few more lithium batteries, and remember to turn off the power when not shooting to save power. If you have an external battery box as a backup power supply, you can also place the battery box in your clothes and power the camera through the wire.
Military Low Temperature Lithium Battery Standard
1. One of the first conditions for military low-temperature lithium batteries is that the larger the capacity, the lighter the weight, the better.
At present, there are many kinds of low-temperature lithium batteries. Each low-temperature lithium battery has various advantages and disadvantages. The only batteries that can be satisfied are polymer lithium batteries, lithium iron phosphate batteries and ternary lithium cobalt oxide batteries. Among the three low-temperature lithium batteries, the polymer lithium battery has the highest energy density and the lightest weight, followed by the ternary lithium cobalt oxide battery, and finally the lithium iron phosphate battery.
2. The low-temperature lithium battery standard for military use must meet certain safety requirements
The safety of lithium batteries is an important factor to be considered whether it is for civilian use, military use, or equipment applications in special fields. However, different application fields or uses have different battery safety requirements. The safety level requirements of low-temperature lithium batteries for military use are relatively high. The first one is that the battery must pass the gunshot test, and the battery must not explode or burn. The other requirements are that the battery must be safe during high-intensity impact and blow, and will not cause personal injury or death. .
3. The military low-temperature lithium battery standard must meet certain charging requirements at a certain temperature
The low temperature environment has a great influence on the performance of the lithium battery, so it is a difficult technology to realize the charging of the battery in the low temperature environment. Military low-temperature lithium batteries are generally charged indoors in the wild, and the ambient temperature is mostly -20 °C. Therefore, military low-temperature batteries must meet this basic condition. Under special circumstances, when charging in the open air, it must meet the requirements of -40 degrees that can be charged.
Whether parking or charging, try to choose a relatively high temperature environment, which is conducive to improving the activity of lithium batteries, on the one hand, reducing the loss of cruising range, and on the other hand, indicators such as charging efficiency and charging capacity are also better than those in low temperature environments. For the army, it not only relies on small and thin lithium batteries as power, but also mainly relies on portable energy and batteries as power, so the level of energy density is an important criterion for the combat capability of front-line troops.