Why can't lithium batteries replace car batteries? Actually the cost is only part of the reason

Lithium batteries have great advantages as an energy storage battery. Compared with traditional lead-acid batteries, lithium-ion batteries can kill lead-acid batteries in two ways:.

1:High charge and discharge current

2:High energy density

The first is the charging and discharging current, the most typical example is the charging treasure to start a car. Palm-sized rechargeable treasure to start a 2.0 displacement car, rechargeable treasure internal lithium battery capacity is only about 5ah, equivalent to the capacity of the motorcycle battery.lithium battery cell machine It is impossible to start a car with a lead-acid battery of the same capacity. Starting a car with a motorcycle battery is like telling a joke. This is a manifestation of the high discharge current of lithium batteries. The discharge current of high rate lithium battery can reach 50C, which is 50 times of its own capacity. So the maximum discharge current of 5ah high rate lithium battery can reach 250A, which is incomparable to lead-acid batteries.

Energy density is more likely to appear to understand the existence of some, the same weight under the energy density of the battery can store energy efficiency higher requirements.car battery manufacturers For example, lead-acid battery system energy density at 40wh/kg or so, and lithium battery energy density development has been unable to exceed 150wh/kg, and through the energy density is still in our continuous improvement increase. That is to say that the enterprise the same environmental capacity of the battery, lead-acid batteries than lithium batteries 3-4 times heavier. Automobile power battery weight in about 30kg, if the lithium battery then this weight is only about 10kg students or even lower.

With all the advantages of lithium-ion batteries, why not replace your car's starting battery? The disadvantages of lithium-ion batteries are as many as the reasons for their high price:.

1. Lithium-ion batteries are prone to bursting under external forces.

2. High requirements for charging and discharging

For Li-ion ternary batteries, it will burn quickly after physical damage. For example, new energy vehicle chassis scratches caused by battery damage, or accidents caused by battery damage, the battery will quickly catch fire and burn, rescue is particularly difficult.battery coating The most common example in life is the cell phone battery, some soft pouch batteries in the replacement process if the tweezers pierced, it will immediately burn up, directly into ashes.

Secondly, lithium batteries require good servo circuits, and the charging and discharging requirements are much higher than those of lead-acid batteries. If there is a problem with the protection circuit, the battery will be scrapped, and in severe cases, the battery will spontaneously combust. For example, the battery bulge of the electric car is either over-discharged or over-charged. When the charger breaks down, the battery pack is either scrapped or spontaneously combusts. There are many examples of spontaneous combustion in electric cars.

Theoretically lithium batteries are completely different can be used as a replacement for lead-acid batteries in cars, lithium battery shortcomings can also be at the same time through the means of information technology teaching to be able to compensate. Therefore, we only have such a part of the luxury car with lithium batteries to replace lead-acid batteries, most of the civilian models will not be equipped with lithium batteries.

Lithium batteries are used in automobiles as starter batteries, and then first solve the problem of charging and discharging. The lead-acid battery in a car is a complete Boorman, and it's OK to eat roughage. The regulator built into the generator is fine as long as the charging voltage does not exceed 14.5 volts.

However, when charging lithium batteries, not only do you need to control the voltage, but you also need to control the current. The charging voltage is accurate to 0.1V, and the charging current can't fluctuate too much like lead-acid batteries. So not only does the battery need a complex protection board, the car charging system also needs to be replaced.

Not only will the cost increase, but the charging circuit will also change. Complex circuits are far less simple to use than lead-acid batteries, and the more complex the circuit, the less stable it is. As for cars, their stability is also very important, especially for civilian cars. For civilian cars they are more stable and have fewer problems. Nice is the most important. After all, they are transportation. Some luxury cars are pursued differently, and the luxury experience requires not only a more complex design, but the handling dynamics also require more technological applications. So luxury cars tend to be less stable than civilian models, with more minor problems, but luxury car owners don't care about that.

So only luxury cars are equipped with lithium batteries, but this lithium battery is easy to enter the protection state after long-term parking loss. When the ordinary lithium battery enters the protection state, it can only be released by activating the external power supply. However, automotive lithium battery protection circuit is much more complex.

Lithium batteries enter a dormant state after the need to use a dedicated computer to re-brush the data we can carry out the release of labor protection after all, the trouble, 4s store can not be handled only to the student professional managers information or return to the factory for repair.We can see that it is not important to replace lead-acid batteries with lithium-ion batteries for conventional fuel vehicles. The advantages of lithium-ion batteries cannot be proved in fuel-powered vehicles. After all, fuel-powered vehicles do not need high-capacity batteries; starting current is sufficient.Lead-acid batteries are perfectly suited to the battery requirements of fuel-powered vehicles, and the use of lithium-ion batteries would not only increase the cost, but also reduce the stability of the battery.The lithium-ion battery, which is suitable for luxury cars, will not only reduce weight by 20 kilograms, but will also improve high-end performance - after all, lithium-ion batteries are much more expensive than lead-acid batteries!