18650 li ion rechargeable battery

　　What are the standards for military 18650 li ion rechargeable battery?

　　1. One of the prerequisites for military low-temperature batteries is that the larger the capacity and the lighter the weight, the better;

　　There are many kinds of low-temperature batteries at present. Each low-temperature battery has various advantages and disadvantages. The only batteries that can meet the requirements are polymer lithium batteries, lithium iron phosphate batteries and ternary lithium cobalt oxide batteries. . Among the three types of 18650 li ion rechargeable battery, polymer lithium batteries have the highest energy density and lightest weight, followed by ternary lithium cobalt oxide batteries, and finally lithium iron phosphate batteries.

　　The main performance of low-temperature batteries in today's sales market is as follows:

　　Charging temperature: 0℃~45℃.

　　Discharge temperature: -40℃~+60℃.

　　-40℃ discharge capacity ≥80%

　　-30℃ discharge capacity ≥90%

　　-40℃ discharge capacity ≥70%

　　It has excellent low-temperature cycle characteristics and can complete 300 cycles of electrical cycling with a capacity retention rate of more than 85%.

　　The element of weight is very critical in military equipment, especially in individual combat. The light load of the power supply will directly affect the efficiency and safety of soldiers performing tasks, and the reasonable discharge capacity of low-temperature batteries will directly affect the endurance of electronic equipment. The problem also affects the time allowed for soldiers to perform tasks.

　　2. 18650 li ion rechargeable battery used by the military must meet certain testing standards.

　　Whether in civilian, military or special industry equipment, battery safety is an important factor that must be taken into consideration. However, different uses or application sites have different requirements for the safety of batteries. Military 18650 li ion rechargeable battery have relatively high safety requirements. First, the rechargeable battery must undergo a shooting test. The battery must not explode or ignite. Secondly, the battery must ensure safety during high-intensity collisions and collisions and not cause casualties. .

　　3. The specifications for military 18650 li ion rechargeable battery should meet certain charging requirements at a certain temperature:

　　Because low-temperature environments have a great impact on battery performance, it is a relatively difficult technology to charge batteries in low-temperature environments. Military 18650 li ion rechargeable battery are generally charged in outdoor rooms where the working temperature is high. See around -20℃, so military low-temperature batteries must meet this basic requirement. Especially when charging outdoors, you should consider charging at around -40 degrees.

　　4. The standard of military low-temperature batteries should have a certain service life.

　　Low temperature will seriously affect the operation of rechargeable batteries, and the service life of batteries has always been a flaw. The main impact of low temperature on rechargeable batteries is the problem of lithium precipitation. If the production process does not meet the corresponding requirements, the service life of low-temperature rechargeable batteries will be greatly shortened due to the rapid lithium precipitation rate. Although 18650 li ion rechargeable battery use a special raw material recipe, their service life is still very different from that of lithium batteries at room temperature. Therefore, the service life of military 18650 li ion rechargeable battery is generally one year or longer.

　　5. Transportation safety regulations.

　　The transportation safety requirements for military 18650 li ion rechargeable battery are higher than those for general export and foreign trade transportation vehicles. Because military batteries are more complex in the transportation environment, the vibration of one object is more complicated than other objects. When exposed to vibration, the lithium cells inside the battery will not cause short circuit failure or failure.

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