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let us talk about the 18650 rechargeable lithium battery. Rechargeable batteries have a long service life and a cycle life of more than 1,000 times. Although the price is more expensive than dry batteries, it is still more cost-effective if used frequently. The capacity of rechargeable batteries is lower than that of alkaline batteries or zinc-carbon batteries of the same specification.
Then i will tell you the design theory of the 18650 cylindrical battery. First, Liquid injection volume: Generally speaking, the liquid injection volume of ternary 18650 2.6-3.2Ah cylindrical battery is between 5-5.5g .The specific injection volume depends on the physical parameters (specific surface area, morphology, particle size distribution), winding tightness, areal density, compaction density, etc. of the positive and negative electrode materials. If the injection volume is insufficient, it will result in incomplete internal infiltration, large internal resistance, fewer cycles, etc. Serious will lead to lithium evolution and further danger; If the injection volume is too large, it will result in insufficient internal space (large internal pressure), rapid capacity attenuation, increased cost, etc. Here, the rapid capacity attenuation caused by liquid injection is due to the reaction of the rich free electrolyte with the lithium-carbon compound of the negative electrode with greater activity and the consumption of effective substances, especially at high temperature and during the charging process. Second, Tightness: Tightness is calculated by dividing the sum of the bottom areas of the positive electrode, negative electrode, separator and coil gap by the inner bottom area of the cylindrical battery. Generally 88%-93%. Similarly, the specific tightness depends on the purpose of the battery and the various performances of the final battery you require. If the tightness is too low, it will lead to space waste, increased cost, difficult infiltration of electrolyte (liquid consumption), cell shaking, etc. Excessive tightness will lead to insufficient space caused by subsequent cell expansion, which will affect electrochemical performance and easy disconnection with large internal pressure. Third, Number of lugs: the increase of the number of lugs can only increase the AC internal resistance of the battery in a limited way, and has no direct relation with the DC internal resistance in the final use process.Moreover, increasing the number of lugs will increase the difficulty of battery process design, increase the cost and end-use risk. Therefore, in order to increase the final battery capacity or multiplying power performance, it is feasible to increase the number of polar ears one-sided and must be carefully designed.
INR18650 2600mAh Li-ion Rechargeable Cylindrical Battery
Let us talk about the 18650 rechargeable lithium battery. Rechargeable batteries have a long service life and a cycle life of more than 1,000 times. Although the price is more expensive than dry batteries, it is still more cost-effective if used frequently. The capacity of rechargeable batteries is lower than that of alkaline batteries or zinc-carbon batteries of the same specification.