Why do all power lithium battery manufacturers use Panasonic 18650 lithium batteries? When Tesla was producing electric cars, only 18650 batteries were the most mature. In 2008, Tesla cooperated with Panasonic for its first model, using 18650 lithium cobalt acid battery as its power lithium battery.
Why do power lithium battery manufacturers use Panasonic 18650 lithium battery?
18650 lithium battery is the earliest, most mature and stable lithium-ion battery, widely used in electronic products, China's annual production of 18650 lithium battery is about billions of sections, far beyond the other materials of the battery. Over the years, Japanese lithium battery manufacturers have accumulated a lot of experience in the production process of 18650 lithium battery, making the output of 18650 lithium battery consistency, safety have reached a very high level.
In contrast, the laminated lithium-ion battery is far from mature, common square cells, soft pack batteries, even the size, size, pole lug position, etc. are not uniform, the battery manufacturers have the production process can not meet the conditions, most of the human control-oriented, the consistency of the battery does not reach the level of 18650 lithium batteries. This also makes a large number of batteries in series and parallel to form the management of the battery pack will also not allow the performance of each battery to better play, and 18650 cells can solve this problem.
Power lithium battery in the operation process, to meet the safety standards, the battery management system plays a pivotal role. 18650 lithium battery's biggest flaw is that its individual battery capacity is low, generally around 2~4Ah, so the number of batteries required is very high, and battery management is more complex. This leads to the need for thermal management system for 18650 lithium battery heat dissipation, and due to the small temperature difference inside the single cell, it is more difficult to keep the temperature difference of the whole battery pack within the appropriate range.
For power lithium batteries, in addition to safety, energy density, range, there is a very important assessment criteria, that is, the cycle life. From the test data, 18650 lithium battery cycle life is generally between 500 to 1000 times, compared to the 2000 times of soft pack batteries is relatively low, to a certain extent, limit the scope of 18650 lithium battery applications.
The difference between 18650 lithium battery and power lithium battery
1, the power lithium battery positive and negative material particles than 18650 lithium battery is more fine, the use of diaphragm materials and electrolyte conductivity better.
2, 18650 lithium battery supports high current discharge, may reach 20 times the capacity of the current, power lithium battery only supports 1 times the capacity of the discharge, that is to say, an ordinary 2600mAh ordinary battery, the maximum discharge current is 2600mA.
3, 18650 lithium battery capacity is generally smaller than the power lithium battery capacity is about double, the general power lithium battery operating voltage than 18650 lithium battery voltage is lower;.
4, 18650 lithium battery charging voltage is up to 4.2V, power lithium battery maximum charging voltage is about 3.65V. 18650 lithium battery nominal voltage is 3.7V, power lithium battery nominal voltage is 3.2V.
5, the power lithium battery in the positive and negative electrode leads to more lugs than the 18650 lithium battery
The 18650 lithium battery has a high degree of automation, stability and replaceability, which makes 18650 battery has unparalleled unique advantages in the modularity of system development and standardization. It can effectively reduce production costs and save labor" 18650 battery is better than soft pack battery in terms of energy density. Therefore, 18650 lithium batteries have great advantages especially when used in micro and small electric vehicles.
18650 lithium battery safety performance, non-explosive, non-combustible, non-toxic and non-polluting, a variety of safety performance in one go, the number of cycles is more than 500 times; high temperature resistance, 65 degrees under the conditions of discharge efficiency of 100%. To prevent the short circuit phenomenon, the positive and negative poles of 18650 lithium battery are separated, and a protection plate can be added to avoid overcharging and over discharging the battery, which also extends the service life of the battery.
18650 is currently the most mature power battery products, using 18650 lithium battery as the source of power for new energy electric vehicles, at this stage is the optimal choice. With the maturity of the battery technology process, at the same time there will be more new battery applications in the new energy electric vehicles.
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