Why is there still no use of lithium batteries with so many advantages in car batteries?

We know that lithium batteries have been widely used in the field of lithium-ion batteries for new energy vehicles due to their light weight, high energy density, and environmental protection. However, lithium batteries are rarely seen in car batteries. why? First of all, safety. The reason why lithium batteries have not been popularized in the field of car batteries is safety, which is not unrelated to the properties of lithium batteries. It is known that the discharge temperature of lithium batteries is -20 degrees to 60 degrees, and the charging temperature is 0 degrees to 45 degrees, and collisions can easily cause fire and explosion. It can be said that lithium batteries are most afraid of high and low temperatures. Netizens who have opened the hood know that the temperature of the engine of a traditional fuel vehicle is very high when it is working, and it is necessary to maintain an optimal operating temperature. In order to maintain this range, the engine cylinder will transfer excess internal heat through various channels. To the engine compartment, leading to the outside of the car. At this time, the temperature of the engine compartment can be imagined. What's more, many vehicles are now equipped with turbochargers, and turbocharging is driven by engine exhaust, and the temperature is generally 400-500 degrees. Such high temperatures are undoubtedly a disaster for ordinary lithium batteries. In addition to temperature, impact compression is also unbearable for lithium batteries. We know that most car batteries are arranged in the car engine compartment. If the lithium battery of the vehicle is squeezed in the event of a traffic accident, the result is likely to be a fire or explosion, causing secondary damage, or even Will become the culprit to harm the members of the car. Secondly, performance and cost. Generally speaking, the performance of lithium batteries is more outstanding, why is its performance discussed here? Things are far from that simple. Let's do a simple calculation. The discharge efficiency of lithium batteries at low temperatures is very low. Therefore, if you want to start the vehicle, you must use more than 5 times the usual battery pack to supply power at the same time. We use the 40Ah battery commonly used in small cars to calculate, the leading brand in the industry, Panasonic The capacity of Samsung 18650 battery can reach 2900 mAh, and about 14 cells in parallel can reach the capacity of 40 amp; on the other hand, if the voltage is to be increased to the level of the starting battery, at least 4 more groups must be connected in series, that is, 14*4 u003d56 cells, we use a high-capacity battery 20 yuan to calculate, the lithium battery will cost 1120 yuan, this cost is related to the three or four hundred yuan lead-acid battery, which is much higher. In addition, when the car starts, the battery must be discharged with a current of more than 100 A, so the battery must at least meet 5C (5 times rate discharge). This can be easily achieved with lead-acid batteries, unlike lithium batteries, which will be straight when large currents. Affect the life of lithium batteries and increase the cost of use. In terms of repair rate, since the current processing and use of lithium batteries only have a history of more than 20 years, there is still room for improvement in some designs and processes, which has also caused a high rate of repairs of lithium batteries processed by many small and medium-sized domestic manufacturers. ; After a century of development, lead-acid batteries have been relatively mature and stable in technology, and can be used more assuredly. Another point is that the lithium battery cannot be supplemented with electric energy while the power amplifier is used. Once the lithium battery of the power amplifier is supplemented with electric energy, it may spontaneously ignite or explode. This also greatly limits its use in automobiles. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.