Why We Think Lithium Ion Battery Will Replace Lead Acid?

- Sep 28, 2018 -


Why We Think Lithium ion Battery will Replace Lead Acid? 


The 12 volt startup and shutdown although the fuel consumption is not as good as 48 volts and HEV, but the one-time input cost is low.




From 6 volts to 12 volts, until now, 12 volts of low-voltage systems have been supplying power to some electronic products. At present, the main 12 volt vehicle is lead-acid battery, which plays a more important role in engine ignition. With the development of science and technology, the EFB and AGM were introduced slowly, and the 12 volt start-up was mainly contributed by AGM.




Lead-acid batteries are subject to chemical constraints. Their reactions are converted from lead sulphate to lead during charging. The solubility of lead sulphate is limited, so it is difficult for us to make chemical reactions so fast during fast charging. So there are some shortcomings in charging. Our early lithium batteries have relatively high temperature performance or life expectancy. There are some limitations.




The EREV, launched in 2009, is a typical battery pack, trapezoidal, matching liquid-cooled system, using soft-packed batteries, with some liquid-cooled capillary technology in the middle, to allow the battery's heat sink and the battery to bond better through a certain pressure, so that the chemical efficiency will be compared. High.


Why do we think lithium battery will replace lead acid? 

One is ASIL, the other is fuel efficiency. It's still challenging to replace the lead and acid in the whole car. First, it's cold start. Lithium-ion batteries are generally difficult to start at minus 40 degrees, especially small lithium-ion batteries. Many people mention the challenge of thermal stability when placed next to the engine. Many start-up batteries are on the engine side. The easiest way to do this is to remove the lead acid and replace it with a 12-volt lithium battery, but it's hot on the side, so it's a challenge for lithium batteries. Another is the one-time input cost, there is a recovery system, ternary recovery will be better, because it has nickel and cobalt, lithium, is relatively valuable, lithium iron phosphate recovery is also a matter to consider.


Let's have a simulate test of lead acide battery power and life as below:



This is a 40 ampere-hour test, requiring 6,000 watts 0.5 seconds, 4,000 watts 4 seconds, and then repeated cycles, requiring a voltage of about 8 volts. The structure of double crystal tip is excellent for many times and can still meet the requirements of cold start even at 40 A. At the same time the biggest advantage is that low-temperature charging is very good, because LOTO voltage is relatively high, so we do not have to worry about zero volts on graphite produce a series of problems.


This is the life test we're still doing, 12 months of data, LOTO itself will produce gas problems, we evaluate the system is based on the back-up compartment model to test, so the life cycle is generally in 30 degrees, up to 45 degrees life test.


This is a summary of our test, the assessment of power or life and weight. Because we're not a professional battery maker, we use small batteries to understand chemical systems and battery design processes.