TSLA files for new battery management patent -Lithium - Ion Battery Equipment

TSLA files for new battery management patent -Lithium - Ion Battery Equipment

According to media reports, TSLA (Tesla) has recently applied for a new patent to improve battery safety by isolating defective battery cells from negatively affecting functioning cells.

The background of TSLA developing this patent is that since the battery cells will generate heat during the charging process and when releasing energy, TSLA found that the defective battery cells will generate heat, which will affect the function of the surrounding battery cells, and usually lead to the continuous battery life. Fault. Therefore, it developed a patent.

The TSLA patent details a complex system that creates an inter-connectivity layer that monitors and regulates temperature and pressure within the battery pack by isolating faulty components.

TSLAModel3 is equipped with the latest generation of batteries, the battery cell 21700. TSLA demonstrated that the cell has a higher energy density than any electric vehicle cell, because it significantly reduces the cobalt content, greatly increases the nickel content, and the battery system remains thermally stable in general. TSLA also noted that the nickel-cobalt-aluminum cathode chemistry of the new TSLA cells is lower than that found in competitors' next-generation batteries.(Lithium - Ion Battery Equipment)

TSLA's new patent shows once again that despite the company's leadership in battery technology, it is driving innovation.

What's so magical about 21700?

The most intuitive difference between the 21700 and 18650 batteries is the larger size.

Due to the limitations of battery material performance, increasing energy density by adding volume has become a key consideration for the company. my country clearly proposes that the energy density of the power lithium battery cell should exceed 300Wh/kg in 2020, and the energy density of the power lithium battery system should reach 260Wh/kg; in 2025, the energy density of the power lithium battery system should reach 350Wh/kg. The continuous improvement of energy density requirements of power lithium batteries is bound to continue to promote the transformation of lithium battery models.

According to the information disclosed by TSLA at the beginning of this year, under the existing conditions, the energy density of its 21700 battery system is about 300Wh/kg, which is about 20% higher than the 250Wh/kg of its original 18650 battery system. The increase in battery capacity means that the number of cells required for the same energy is reduced by about 1/3, which reduces the difficulty of system management and simplifies the number of accessories such as metal structural parts, although the weight and cost of a single cell have increased , but the weight and cost of the battery system PACK have been reduced.

The invention of this new isolation technology allows the 21700 cylindrical battery with higher energy density to be well maintained in terms of thermal stability.

Comments: In terms of cylindrical batteries, Chinese battery companies still have a lot to learn compared with Japan's Panasonic. At present, domestic BAK, Yiwei Lithium Energy, Smart Energy and Suzhou Lishen have already deployed 21700 battery products. The transformation of the production line mainly involves the steps of slitting, winding, assembly, and formation in the middle and rear sections. The mold adjustment cost for the semi-automatic line is low. It is more convenient for battery manufacturers to transform from the original mainstream 18650 to 21700, and will not invest too high equipment technical transformation costs and new equipment investment. However, Chinese car companies are far behind TSLA in terms of battery management technology, and there is too much homework to make up.



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