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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