The square shell cell has the advantages of high shell strength, diverse core-rolling process, high energy density and good stability, and is used for new energy and energy storage. However, the process is complex, heat dissipation is difficult, and standardization is low. Ningde Times, BYD and other enterprises are widely used in Tesla and other brand models.
Square shell cell refers to the cell with a square shell package, the following is a detailed introduction to it: structure composition.

Shell: Usually aluminum alloy or stainless steel and other materials, with high structural strength, can withstand a certain mechanical load, to protect the internal cell structure.
Top cover: the structure is more complex, mainly composed of top cover plate, positive and negative pole, explosion-proof device, liquid injection hole, etc. The pole part generally includes a flip-chip device (OSD), a current cutting structure (CID) and a short-circuit device (Fuse), which play a role in protecting.

Coil core: It is the core part of the solar lifepo4 battery cell, which can be made by winding or laminating two processes. The winding process is to roll four layers of the battery cathode sheet, diaphragm, anode sheet and diaphragm together, which has low processing cost, but the size is fixed and the customization cost is high. The lamination process is to layer the isolation film, anode plate and cathode plate, which has low internal resistance, better charging and discharging power, and higher energy density.

advantage
High package reliability: The square shell structure is strong, which can better protect the internal cell, so that it can maintain stable performance in a variety of use environments.
High energy efficiency of the system: the group structure is relatively simple, and the heat dissipation performance is good, which is conducive to improving the energy utilization efficiency of the entire solar battery house system.

Higher energy density: Compared with cylindrical cells, square cells can hold more active substances in the same volume, thus achieving higher energy density.
Large single capacity: It can meet some application scenarios with high requirements for single battery capacity, such as new energy vehicles, reduce the number of cells in the lithium battery pack, and simplify the battery management system.Relatively good stability: In the process of charging and discharging, the structural stability of the square cell is good, and it is not easy to appear deformation and other problems, which helps to extend the service life of the solar lithium battery.
 

shortcoming
Complex production process: the production process is more complicated than the cylindrical cell, and the yield and consistency are relatively poor, resulting in higher production costs.High heat dissipation difficulty: Although the overall heat dissipation performance is good, due to the large size of the cell, the internal heat transfer path is relatively long, and the local heat dissipation is more difficult, and a more effective heat dissipation design is needed to ensure the temperature uniformity of the energy storage battery.

Low degree of standardization: there are more models of square cells, and there is no unified standard for size and specifications, which brings certain difficulties to the production, management and group application of batteries, and also increases the development and maintenance costs of lithium battery 48v 200ah for solar system.

Application field
Square shell cells are widely used in new energy vehicles, energy storage systems and other fields. In the field of new energy vehicles, square cells produced by Ningde Times, BYD and other enterprises are widely used in models of Tesla, BYD, Geely, BAIC, Wei Xiaoli and other brands. In the energy storage system, the square cell has become one of the important choices for energy storage power stations and other projects because of its advantages of high energy density and stability.