Special topic on lithium battery structural components: Raw material system and manufacturing points for LFP battery aluminum case
Apr 08, 2026
Core positioning and classification of power battery structural components
The precision structural components of power batteries are the core components of lithium batteries, widely covering LFP battery aluminum cases, steel aluminum shells, positive and negative electrode soft connections, etc. Narrowly defined, structural components mainly refer to the battery cell casing and battery cover plate, whose performance directly determines the safety, sealing, and energy efficiency of lithium batteries, and are key materials to ensure stable operation of batteries.
According to different battery packaging technology routes, power batteries are mainly divided into three forms: square, cylindrical, and flexible packaging. The corresponding structural components are square structural components, cylindrical structural components, and aluminum-plastic film. Among them, both cylindrical and square batteries belong to the hard shell packaging system, with similar structural composition, consisting of an outer shell and an Aluminum cover plate for batteries; Soft pack batteries adopt a specialized aluminum-plastic film packaging form, which is significantly different from hard shell structural components.
Raw material system and core production process for structural components
The selection of raw materials and production processes for power battery structural components directly affect the final performance and cost of the product. From the perspective of raw materials, square aluminum shell structural components are made of aluminum alloy as the core material, supplemented by auxiliary materials such as copper, steel, and engineering plastics to meet the precision manufacturing needs of LFP battery aluminum cases; The aluminum-plastic film used in soft pack batteries is mainly made of aluminum foil, nylon, and polypropylene, and is compounded with a special adhesive to achieve a multi-layer structure. At the process level, the production core of battery cover plates relies on precision processes such as stamping, welding, and injection molding, while the shell is mainly formed through stamping and stretching processes.
Aluminum plastic film is usually made using precision coating and multi-layer composite technology. In addition to basic manufacturing technology, extended technologies such as explosion-proof valve design and high-precision welding have become the core direction for optimizing the structure of Battery aluminum safety cover sets. At the same time, automation equipment and flexible production lines are widely introduced in the industry to meet the efficiency and consistency requirements of large-scale precision manufacturing.
Development status and packaging requirements of hard shell structural components
The safety and service life of power batteries largely depend on the level of packaging technology, and the technical difficulty of different packaging routes varies significantly. Packaging design not only needs to meet physical protection requirements such as impact resistance, vibration resistance, and resistance to compression and puncture, but also needs to have core chemical properties such as fire resistance and flame retardancy to adapt to harsh operating environments such as new energy vehicles and energy storage systems.
In the hard shell structural component system, the manufacturing process complexity of the battery cover plate is much higher than that of the outer shell, so Aluminum battery box cover has become the technical core and value center of the entire hard shell structural component. The design of copper aluminum bimetallic plates is based on the comprehensive consideration of the dual requirements of protection and conductivity mentioned above.
Core functions and component composition of lithium battery top cover
The hard shell power Copper and aluminum bimetallic bipolar plate integrates multiple core functions to comprehensively ensure the safe operation and stable performance of the battery.
Its core functions can be divided into four categories: first, fixed sealing, which connects the Prismatic lithium battery lid include explosion proof plate to the aluminum shell through laser welding to wrap and fix the battery cell, and provide comprehensive sealing protection;
The second is current conduction, which relies on electrodes and connecting pieces to achieve internal charge and discharge conduction of battery cells, as well as series parallel circuit connections at the module level;
The third is safety protection, which combines the dual mechanism of explosion-proof board pressure relief and flip board fuse protection to avoid the risk of abnormal battery explosion;
The fourth is to prevent electrochemical corrosion, by using positive electrode conductive PPS plastic to reduce the potential difference between the pole and the aluminum shell, reduce electrochemical corrosion losses, and extend the service life of the battery. The core components of a Power battery cover plate include an explosion-proof plate, a flip plate, and an electrode column. These three components have clear division of labor and together form the core functional carrier of the cover plate.
Contact us
The above content systematically summarizes the structural classification, raw material system, production process, and core functions of LFP battery aluminum cases. If you need to further understand the design schemes of cover plates under different packaging routes or obtain technical parameters of customized structural components, please feel free to contact us at any time. We will provide you with professional technical support and product consulting services.
