How To Increase Battery Power Exposing Tesla
Author: Source: Datetime: 2016-09-22 13:39:05
In accordance with EU rules, the EU Member States marketed models must be certified before its authority. RDW is a Dutch company commissioned Tesla obtained licenses sold in the EU through its certification after. Let's explore under 100kw/h this is how to do?
Elon Musk has said that Tesla's life (power) to increase by 5% per year. From the current iteration of the lifePo4 batteries pack group, the basic realization of this goal. In addition to being outside the entry-level configuration of 60kw/h, 70kw/h, 85kw/h, respectively, have been upgraded to 75kw/h and 90kw/h.
Soon after, 100kw/h and 120kw/h battery pack will also enter an optional list. Currently, 60kw/h still exists as a beggar Edition configuration, in order to promote sales of Tesla. The real story is 70kw/h and 85kw/h, is how each increased 5kw/h electricity.
One thing is certain, that the battery pack during the increase, its battery pack structure is not changed. The number of internal battery pack (Battery Module) has not changed. Let's take a brief look at the internal structure of the Tesla battery pack.
Internal 60kw/h battery pack 14, each battery pack contains 384 batteries, a total of 5376 batteries composed; 85kw/hlifePo4 batteries pack16 each, each battery pack contains 444 batteries, a total of 7102 electric core components.
Later joined 70kw/h, 75kw/h battery is actually a group, after the software limit comes. Excess 5kw/h, initially as a $ 3,000 option package provided to the owners. Just by OTA software update, 70D can become 75D.
So the question is, 75kw/h battery pack is how come? On this issue, Tesla did not make the official technical explanation. According to the author's judgment, 75kw/h battery pack 85kw/h in fact, reduce the two battery packs come. In 85kw/h battery, the capacity of each lifePo4 batteries pack is 5.3kw/h, 14 of such a battery pack is 74.2kw/h.
This is 70kw/h, 75kw/h, 85kw/h and the relationship between. As 60kw/h, this is just a set up in order to reduce barriers to entry and configuration only. So, 90kw/h is how come?
From 85kw/h to 90kw/h, more 5kw/h. Added an extra battery pack is it? In the structure of 85kw/h battery pack, the battery pack can no longer superimposed. The only possibility is to replace the new batteries. Of course, it is still used in batteries 18650 models, but chemicals have to be adjusted to increase the energy density.
In this procedure, the Tesla electric core graphite anode, add a small amount of silicon, thereby enhancing the energy density of batteries.
Added silicon in the anode, is recognized in the art can improve battery energy density approach. To avoid constantly superimposed on the battery pack, and the battery quality caused by too large, Tesla will only be able to focus on the development of high energy density of the batteries. However, for three yuan lithium-ion batteries, in order to increase the energy density of silicon, it is not so simple.
The basic principle is: After the addition of silicon in a graphite anode, since the structure of silicon atoms as compared to graphite can accommodate more lithium ions, resulting in an anode for lithium ion absorption capacity enhancement. Single charging and discharging cycle, the more the lithium ion anode, the greater the energy density.
Silicon, however, after fully absorb lithium ions, its volume expands by 300%, compared with a lithium-ion graphite to absorb expansion after 7% to be much larger. This repeated change in volume will result in solid electrode become "soft" and easy to collapse away. In this, the cycle life of the battery will be reduced.
Another layer of factors, silicon anode is due to the expansion / stretch characteristic during charging and discharging, the lithium battery will destroy the electrolyte is formed SEI film. This film is a lifePo4 batteries pack in the first loop is formed, the anode material has a protective effect, it can prevent the material structure collapse.
For these reasons, the use of silicon as the anode material, although the energy density can be significantly improved, but also accompanied by side effects, will eventually lead to shorter lifePo4 batteries pack life. Therefore, the solution is to take Tesla, gradually adding a small amount of silicon in a graphite anode, to find a balance in the energy density and cycle life.
18650 Tesla using Panasonic is produced. With the deepening of bilateral cooperation, Tesla is also developing new cylindrical batteries. After the Model 3 formally put into operation, the new battery will be replaced 21700 18650, to become the new batteries.
21700 battery still is a ternary lithium battery cathode material lithium nickel-cobalt-aluminum (NCA). This cylindrical battery three yuan, is currently the highest energy density battery solutions. Compared block-shaped batteries, such batteries, although high energy density which use portable solar power generator, but the stability is poor, we need to have a more excellent BMS (Battery Management System) support.
The first Tesla Roadster uses a Panasonic NCR18650A battery, rated voltage 3.6V, capacity 3.1Ah. Before the 85kw/h battery pack is used NCR18650B type battery rated voltage of 3.6V, the capacity of 3.1Ah.
90kw/h battery type is unknown, but it should not be provided directly by Panasonic products, but Tesla and Panasonic jointly developed specifically for Tesla models, customized batteries. At present, the production of Panasonic 18650 battery, NCR18650G type is the highest-capacity model, reaching 3.6Ah. According to this calculation, then, 85kw/h battery pack 7102 batteries, replace G-type battery, just 90kw/h
Therefore, there is a possibility that 90kw/h battery pack, batteries are NCR18650G type; and 85kw/h battery pack, batteries are NCR18650B type. In short, in the same number of batteries (battery pack structure constant) of the cases, only the single batteries to enhance the capacity of 3.6Ah, in order to ensure 90kw/h of electricity.
To achieve 100kw/h, there are two options: First, and then superimposed two battery packs, a battery pack for each 5.3kw/h capacity, just to get 100kw/h; the second is to replace a higher energy density batteries. The author believes that the latter is the best, and most likely a program.
Because 90kw/h battery pack is based on the structure from 85kw/h. The structure under the 18650 standard, has been finalized, to change the design of the structure of the cost is very high. In fact, the battery pack is no space and then superimposed the additional battery pack.
If you increase the lifePo4 batteries pack, not only will increase the quality of the battery pack, the battery pack cooling system should be changed. Therefore, to enhance the capacity of the batteries, it is the most economically viable solution for lifePo4 storage batteries for solar power portable generator.
Just think, in 100kw/h lifePo4 batteries pack packs, the battery pack without changing the structure of the case, the individual batteries to enhance the capacity to 3.9Ah, be possible to achieve the capacity of 100kw/h. Therefore, the authors suspect Tesla and Panasonic have developed a 3.9Ah of 18650. This credit can only be attributed to the anode of silicon.
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