Why does Tesla use 7000 batteries?

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As we all know, Tesla’s battery is composed of more than 7000 AA batteries, and Tesla uses Panasonic’s 18650 battery. The current safety hazards are quite high! The performance of the Tesla battery composed of more small batteries is currently not stable. It is not only a safety hazard, but also extremely easy to deform during a collision. As long as a battery is loose and easily deformed, a major safety hazard may occur. Such as explosion.

So why did Tesla keep using it instead of using a single large battery, knowing that there are so many potential safety hazards? We all understand that we need to look at problems with a dialectical perspective. We can't just see the disadvantages of Tesla batteries and ignore the benefits of it.

Tesla’s battery density is high. Compared with engines of the same size, Tesla’s batteries can store more power. Tesla sells not only batteries, but also technology, which is about 7190 battery management. The electronic control technology, the same as the Falcon rocket engine, uses the parallel method. Its electronic control technology for battery parallel has reached a very high level, which can ensure the stability of the parallel connection and prevent unnecessary problems from occurring. If the Tesla battery composed of multiple small batteries is damaged, you only need to replace a small part of the damaged battery. It is not necessary to replace the entire battery, which is not only convenient but also saves money!

Compared with BYD, BYD’s battery is planted on lithium iron phosphate. The ternary backwardness is the most fundamental reason for its failure. In the 2018 power lithium battery subsidy standard, it is required to increase the power lithium battery. Capacity, so there is room for ternary to increase, and BYD has focused on lithium iron phosphate earlier. Research on ternary has rarely failed to meet the national subsidy standards, and there has always been a situation of inverted stickers. .

The new energy era is an era of competition for comprehensive strength. We cannot just talk about batteries and ignore other factors. We must start from a comprehensive perspective, stand on a good starting point, and treat all kinds of competitive products in the current market with a new vision, no matter it is Whether it is technology or energy, as long as it can make a good contribution to society, it has its usefulness. 18650 is the originator of lithium-ion batteries-a standard lithium-ion battery model set by SONY in Japan in order to save costs, where 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.

Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of the lithium ion battery is 3.7v, the charging cut-off voltage is 4.2v, the nominal voltage of the lithium iron phosphate battery is 3.2V, the charging cut-off voltage is 3.6v, the capacity is usually 1200mAh-3350mAh, and the common capacity is 2200mAh- 2600mAh.

Advantages of 18650 lithium ion battery:

1. Large capacity. The capacity of 18650 lithium ion battery is generally between 1200mah and 3600mah, while the general battery capacity is only about 800. If 18650 lithium ion batteries are combined to form a 18650 lithium ion battery pack, the 18650 lithium ion battery pack is free Anything can break through 5000mah.

2. Long life, 18650 lithium-ion battery has a long life, and the cycle life can reach more than 500 times in normal use, which is more than twice that of ordinary batteries.

3. High safety performance, 18650 lithium ion battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, certified by RoHS trademark; all kinds of safety performance are completed in one go, the number of cycles is greater than 500; high temperature resistance performance, 65 degrees Discharge efficiency reaches 100% under conditions. In order to prevent the battery from short-circuiting, the positive and negative electrodes of the 18650 lithium-ion battery are separated. Therefore, the short-circuit phenomenon may have been reduced to the extreme. A protective board can be installed to prevent overcharge and overdischarge of the battery, which can also extend the service life of the battery.

4. The voltage is high. The voltages of 18650 lithium-ion batteries are generally 3.6V, 3.8V and 4.2V, which are much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries.

Lithium iron phosphate as a lithium-ion battery material has only appeared in recent years. The domestic development of a large-capacity lithium iron phosphate battery was in July 2005. Its safety performance and cycle life are unmatched by other materials, and these are also the most important technical indicators of power lithium batteries. The 1C charge-discharge cycle life is up to 2000 times. Single-cell battery will not burn or explode when overcharged at 30V. The positive electrode material of lithium iron phosphate battery makes the large-capacity lithium-ion battery easier to use in series. To meet the requirements of frequent charging and discharging of electric vehicles. It has the advantages of non-toxic, non-polluting, good safety performance, wide source of raw materials, low price, and long life. It is an ideal cathode material for a new generation of lithium-ion batteries.

Is the 18650 lithium ion battery a lithium iron phosphate battery?

18650 lithium ion batteries include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, lithium iron phosphate, and so on. The cycle life of lithium iron phosphate battery can reach 1000-2000 times. High cycle is its characteristic, and its unit price is much lower than that of ternary lithium ion battery. Most of them are used in new energy buses.

After years of development, 18650 lithium-ion battery has been very mature and stable; at the same time, because of its long history, it has formed a relatively mature market application. With the development of new energy applications, the status of 18650 lithium-ion batteries has gradually been impacted. Larger cylindrical lithium-ion battery products and square-shaped battery products have appeared on the market in large numbers. Many companies have begun to use lithium iron phosphate batteries. In the application of power lithium battery, iron phosphate lithium ion battery will gradually replace 18650 lithium ion battery.

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