Why are lithium-ion batteries not popularized on batteries?

The reason why lithium-ion batteries have not been popularized in the field of car storage batteries is largely due to safety, which is not unrelated to the properties of lithium-ion batteries. It is known that the discharge temperature of lithium-ion 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-ion 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-ion batteries. In addition to temperature, impact compression is also unbearable for lithium-ion batteries. We know that most car batteries are placed in the car’s engine compartment. If the lithium-ion battery of the vehicle is squeezed in case of a traffic accident, the result is likely to be a fire or explosion, causing secondary damage. It will even become the culprit for hurting the members of the car. Secondly, performance and cost. Generally speaking, the performance of lithium-ion 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-ion 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 The capacity of the Panasonic 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 raised to the level of the starting battery, at least 4 more groups must be connected in series, that is, 14* 4u003d56 cells. Let’s calculate with a high-capacity battery of 20 yuan. Li-ion batteries cost 1120 yuan. This cost is much higher than that of a lead-acid battery of 300 to 400 yuan. In addition, when the car starts, the battery must be discharged with a current of more than 100 ampere hours. Therefore, the battery must at least meet 5C (5 times rate discharge). This can be easily achieved by lead-acid batteries, unlike lithium-ion batteries. It directly affects the life of lithium-ion batteries and increases the cost of use. In terms of repair rate, as the current processing and application of lithium-ion batteries has only a history of more than 20 years, there is still room for improvement in some designs and processes, which has also caused the repair rate of lithium-ion batteries processed by many small and medium-sized domestic manufacturers to remain high. Circumstances; lead-acid batteries, after a century of development, the technology is relatively mature and stable, and the use of them is more assured. Another point is that lithium-ion batteries cannot be supplemented with electric energy at the same time as the power amplifier. Once the lithium-ion battery of the power amplifier is supplemented with electric energy, it is likely to spontaneously ignite or explode. This also greatly limits its use in automobiles. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the basic protection and core functions of lithium-ion battery BMS