Jin Jiuyin 10th autumn recruitment season, I interviewed many excellent students last month, but it is a bit regrettable that most of the students are the same as me, their understanding of power batteries stays at the level of chemical principles, battery structure, production process, etc. There is no concept of practical application problems such as industrialization. In fact, I also understand this very well. After all, what I learned in school and tinkered with in the laboratory must be different from the practical application of industrialization.
In order to let friends inside and outside the industry know about power batteries and help more outstanding students become my peers (as soon as possible to recruit students from suitable schools to work together), I plan to complete the public industry information and write motivation for everyone The actual situation of industrial applications such as battery process flow, test items and recycling. Understanding the structure and composition of power batteries is the basis for understanding the industrialization of power batteries. Today, we will first talk about the structure and composition of power batteries.
A battery pack is often composed of several battery cells, thermal management systems, battery management systems (BMS), electrical systems and structural components. For traditional battery packs, the battery unit here refers to the module. However, with the advancement of battery technology and the improvement of the quality of battery cells, CTP (Cell to Pack) technology breaks through the bottleneck of battery pack structural stiffness and reliability balance.
As the name implies, CTP uses cells to directly form battery packs, eliminating the need for the structure of battery modules. In this way, structural components that cannot supply energy can be used less, making more space for cells and improving the energy density of the battery system. , which is conducive to improving the battery life of the vehicle. From the relevant data of CATL, CTP technology reduces the number of battery pack components by 40%, increases energy density by 10%-15%, and increases production efficiency by 50%. At present, CTP has been applied in batches in BAIC EU5, Xpeng P7/G3 and other models.
The next generation of CTP technology is CTC (Cell to Chassis). By integrating the cells directly into the chassis, achieving a higher degree of integration and saving space as much as possible, CTC can increase the vehicle's cruising range to 1,000 kilometers. The cell 2 car mentioned by Volkswagen Battery Day is essentially the same. This CTC looks like a sweet pastry, but it is actually a hard bone. Its technology research and development still needs to face the tests of cell consistency, chassis shock resistance, and chassis heat dissipation. In the future, it depends on which battery factory or car company can pull it out. Got the top spot.