Reading volume: 95
Recently, Tesla announced a patent, claiming that the service life of its battery has been extended to 6,543.8+0.6 million kilometers, which has attracted the attention of people in the power battery industry.
It is understood that the patent was jointly developed by Tesla and Dalhousie University in Canada. By using new electrolyte additives, the service life of lithium batteries can be extended.
The new electrolyte additives are MDO and PDO, and the prepared lithium battery is NMC/ graphite bag battery, which has high temperature storage and long-term cycle performance.
The specific process is that MDO and PDO form SEI layer on the surface of graphite electrode, and the performance of the prepared battery is better than that of the battery containing VC.
At the same time, in the long-term cycle test, the performance of batteries prepared by 2% PDO/ 1% DTD and 2% PDO/ 1% LFO is also better than that of batteries containing VC.
The typical feature of this patent is that the invented electrolyte additive (lithium salt) can greatly improve the service life and performance of the battery system when combined with non-aqueous solution.
After 1000 discharge cycles, the battery pack can last 95% of its life. The corresponding lithium battery without additives has a life span of only 25%. After 3000 discharge cycles, the battery with additives can still maintain 90% life.
The earliest trace was from 2065438 to August 2008, when Tesla submitted a patent entitled "Dioxide and Nitrile Sulfite as Electrolyte Additives for Lithium Ion Batteries".
This shows that Tesla has a deep scientific research and technical investment in the research of electrolyte additives.
To a certain extent, it also shows that although Tesla is an electric vehicle, he has a deep understanding of the performance development of power batteries.
Perhaps this is the case, Tesla can maximize the performance of the car battery pack, allowing the Model S to travel 600 kilometers with full electric energy, while the target Porsche Taycan can only travel 320 kilometers.
In addition, from a technical point of view, Tesla's best-performing vehicle has a battery life of about 800,000 kilometers. Now the patent is 6.5438+0.6 million kilometers, and the service life is directly doubled. There must be a clear breakthrough in technology.
However, when Tesla announced the patent, it did not specify the detailed test conditions such as charging and discharging rate, charging and discharging depth and harsh environment, so the actual technical effect cannot be simply understood as the multiplication relationship from 800,000 km to 6,543.8+0.6 million km.
Industry professionals said that Tesla's battery life of 6.5438+0.6 million kilometers is a prerequisite.
For example, different charge-discharge rates and different charge-discharge states have great differences in battery life.
To take a step back, according to Tesla's Model S fully charged 600 kilometers, the patented battery can achieve about 2700 deep fully charged discharge cycles.
Corresponding to the technology of domestic power battery enterprises, the high energy density ternary battery in the first and second lines is about 1000-1500 times, and the third line is within 1000 times.
If it is not fully discharged, according to the understanding of Hi-Tech lithium battery, based on the 25℃ environment of 0.33C charging/1C discharging, the depth of charging and discharging is 50% and the state of charge is 30%-80%, and the number of battery cycles of domestic first-and second-tier battery enterprises can reach nearly 4000 times.
So the key to Tesla's patent is the consistency between its battery and other good quality, at least on the road of automobile supervision.
For example, Tesla dares to claim that the battery performance of its car reaches a certain standard and is willing to sign the corresponding contract. Domestic enterprises generally dare not take this risk.
This is not to say that the domestic battery technology is backward, but in the production process, due to the lack of intelligent manufacturing, technology and equipment standardization, the safety of single batteries after leaving the factory can not reach the level above PPM.
As a result, domestic enterprises dare not boldly guarantee or promise that their products can reach the level of vehicle regulations when facing the market, coupled with the corresponding legal constraints, they are even more afraid of market reputation damage, so they are very cautious.
In a word, the electrolyte patent brings Tesla at least two inspirations.
The improvement of battery performance in the first quarter can completely seek a breakthrough from the source.
For example, pay attention to the research and improvement of electrolyte, separator and anode and cathode materials to further improve and break through the battery performance.
Second, there is an urgent need to build a vehicle safety production system.
It is very important for domestic battery enterprises to pay attention to manufacturing technology and quality control in order to ensure that the quality error of batteries after leaving the factory is extremely small and the degree of standardization is extremely high, so as to meet the performance requirements of end consumers.