Can lead-acid electric cars be replaced with lithium ion batteries?

Recently, some friends always ask me how to change their lead-acid of electric vehicles into lithium ion battery, whether only replace the battery directly or not. As person repairing car for a decade, I don't agree with this idea. Why?

Of course, the answer is no. Now, we can take a look at how the lead-acid electric car to lithium electricity the pool.48 v lead-acid batteries, for example, the first step to open the battery of the four screws, carefully open the cover, you can see there is 4 piece of 12 v lead-acid battery. The second step, after the battery lines clear mind, using electric wire from the battery, the operation should pay attention to prevent the battery short circuit. Third step, remove all old batteries, lithium electricity put into. Install batteries, some prominent small plastic is separated from the original lead-acid batteries, this must remove, or to be worn after new battery. Fourthly, the terminal is on the battery connection, and then good with electrical tape.

Note, however, the original in replacing the lithium battery, lead acid batteries must demand consistent with the original car battery voltage, capacity can be increased, longer battery life. Even the same capacity, lithium battery range and life will be longer. Second, pay attention to is the original charger not lithium electricity, need to buy separate or customized special charger.

There are, of course, someone will ask controller, motor these need to be replaced? In lithium-ion batteries as long as the voltage, large capacity point is a good thing. Electric capacity casually as long as the voltage constant, motor and controller also have a question, if the lithium battery itself quality has a problem, and it is likely will burn out the controller.

Since lithium-ion batteries advantages so much, why don't recommend to replace lead-acid batteries with lithium battery?

First of all, the production cost is high, the lithium battery production equipment expensive labor costs about 40% of the production costs, the price would be about three times that of lead-acid batteries. Three times the price of the price is not high, a slick feel to the person, and lithium battery is difficult to recycling, utilization rate is not high.

Second, due to the lithium battery is small in size, was only lithium battery series, to assemble in the transport and use, may cause a solder joint disconnect or virtual welding, this is the common fault of the lithium battery connection.

Third, large current discharge characteristic of li-ion battery itself is the short board, think of all the frequent start congested roads, the battery life will be greatly reduced.

Lithium battery is the most important reason to fire explosion safety hidden trouble, who also don't want to buy a "time bomb" in the body. Especially in the case of consumers unwittingly let down the nets for some inferior lithium battery, the electric car that the sealing condition isn't so good, damp easily lead to poor contact and so on reasons cause potential safety hazard. Some might say, now, lithium battery technology rapid development, will not appear this kind of problem, but no one can guarantee such problem won't happen.

In my opinion, although compared with lead-acid batteries, lithium-ion batteries of the same weight and volume, storage capacitance of the lithium battery is normally than about three times higher than that of lead-acid batteries. But for electric vehicles as a transport, actually effect is limited, because at present a lot of lead-acid battery its battery life also has improved, has reduced the gap between lithium battery and lead acid batteries. Plus the promulgation of the new national standard, the speed limit is 25 km/h and so on several regulation, consumer also won't be too strict pursuit in the electric, and let consumers spend a few times more money to pay, also not many people would like to believe that.

All in all, not only lithium ion battery safety but also cost are not conducive to its promotion. At the current technology, it is given priority to lead-acid batteries. I don't suggest to change lead-acid electric cars into lithium battery one. In addition to the security, the new national standard, modified car could be defined as the car out of standard. If you are really interested in the lithium ion battery, I recommend you to choose a regular lithium trams.

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