Production technical indicators of 2000mah 18650 battery from battery manufacturers

　　Starting from all aspects that are conducive to the low-temperature discharge performance of the battery, while other performance indicators such as battery capacity and weight meet the requirements, try to improve the discharge performance of the battery at low temperatures of -40°C and extend the service life of the battery.

　　(1) The development plan of 2000mah 18650 battery starts from all aspects that are conducive to the low-temperature discharge performance of the battery. While other performance indicators such as battery capacity and weight meet the requirements, the discharge performance of the battery at low temperatures of -40°C is maximized to extend the use of the battery. Life span.

　　The specific plans are as follows:

　　① Starting from the positive plate, adjust the composition of the Pb-Ca-Sn-Al alloy and add the Sn content to 1.2% to 1.5% to increase the mechanical strength and corrosion resistance of the grid. Adding 0.1% Ag to the alloy can increase the creep resistance of the grid, which is beneficial to improving the deep cycle discharge cycle performance of the battery. Use a radioactive grid structure to move the pole tabs to the middle of the pole plate, thin the thickness of the pole plate, increase the number of pole plates, and improve the battery's high current discharge capability.

　　②In order to extend the battery life and improve the low-temperature and high-current discharge capability, a high-density lead paste formula is selected, and an appropriate amount of conductive agent is added to the lead paste. Use larger installation pressure and internal formation methods to further improve battery service life. The addition of conductive additives in the positive plate can reduce the resistance of the plate and significantly improve the low-temperature discharge performance of the battery; it improves the conversion efficiency of the positive active material and makes it easier for the positive plate to penetrate; it ensures the high porosity of the positive plate, which is more conducive to acid The liquid spreads to the inside of the electrode plate, improving the utilization rate of active materials;

　　③ Increase the proportion of lignin and humic acid in the negative electrode lead paste, which more effectively prevents the formation of the lead sulfate passivation layer and increases the low-temperature discharge capacity of the battery;

　　④The addition of activated carbon in the negative electrode paste ensures the high porosity of the negative electrode plate, which is more conducive to the dispersion of acid solution into the interior of the electrode plate and improves the utilization rate of active materials;

　　⑤The number of positive and negative plates is increased in the pole group, which increases the actual surface area of the plates and ensures that the battery has a higher discharge capacity;

　　⑥ Use high-quality AGM separators with high porosity and low internal resistance to improve the excellent permeability of ions in the electrolyte, thereby ensuring excellent low-temperature performance of the battery;

　　⑦ The use of high-purity, high-solid-content nanosilica sol and mixed colloidal electrolyte containing Na2SO4 additive dilute H2SO4 makes the electrolyte gel evenly without stratification, improves the battery's charging ability after over-discharge, and ensures the battery's service life.

　　(2) The primary technical objectives of 2000mah 18650 battery are shown in the table

　　1. Low temperature battery production technical indicators

　　(3) Performance comparison of 2000mah 18650 battery and ordinary batteries Low-temperature formula

　　Through testing, it was found that the battery produced using the ultra-low temperature positive and negative active material formula of the present invention has a discharge capacity of more than 50% of the rated capacity under ultra-low temperature conditions (-40°C).

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