According to foreign media reports, Tesla recently applied for a new patent to prevent the negative impact on the functioning battery cells by isolating the defective battery cells, thereby improving the safety of the battery.
The background of Tesla's patent development is that because the battery core generates heat during charging and when energy is released, Tesla finds that the defective battery core generates heat, which affects the function of the surrounding battery cells. Caused a continuous failure of the battery. Therefore, it developed a patent.
The Tesla patent details a complex system that creates an inter-connectivity layer that monitors and adjusts the temperature and pressure within the battery pack by isolating faulty components.
The Tesla Model 3 is equipped with the latest generation of batteries, battery core 21700. Tesla proves that the battery core has higher energy density than any electric vehicle battery core, because it greatly reduces the cobalt content, and greatly increases the nickel The content, the battery system is also generally thermal stability. Tesla also pointed out that the new Tesla battery core nickel-cobalt aluminum positive electrode chemical composition is lower than the competitor's next-generation battery content.
Tesla's new patent shows once again that although the company is a leader in battery technology, it is still driving innovation.
What is the magic of the 21700?Due to the limitation of battery material performance, increasing the energy density by increasing the volume has become the key target of the enterprise. China has clearly proposed that the energy density of the power battery cell will exceed 300Wh/kg in 2020, and the energy density of the power battery system will reach 260Wh/kg; 2025 The energy density of the annual power battery system should reach 350Wh/kg. The continuous improvement of the energy density requirement of the power lithium battery is bound to continue to help drive the transformation of the lithium battery model.
According to the information disclosed by Tesla at the beginning of this year, under the existing conditions, the energy density of the 21700 battery system produced by it 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 batteries required at the same energy is reduced by about 1/3, which reduces the difficulty of system management and simplifies the number of components such as metal structural parts. Although the weight and cost of a single battery are improved, the battery The weight and cost of the system PACK has been reduced.
The invention of this new isolation technology enables the 21700 cylindrical battery with higher energy density to be well maintained in thermal stability.