LiFePo4 Prismatic Battery Aluminum Cells
The square aluminum case is a structural protection and packaging component specially designed for LiFePo4 Prismatic Battery Aluminum Cells. It assumes the four core functions of mechanical support, electrical insulation, sealing protection and thermal management conduction in the entire battery manufacturing chain. Different from ordinary metal stamping parts, this product is a Class A safety structural part in power batteries and energy storage battery systems. Its quality directly determines the long-term cycle stability and system-level safety performance of the battery core.
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Product Introduction
This series of LiFePo4 Prismatic Battery Aluminum Cells are high-power, long-cycle secondary energy storage batteries. The core chemical system is the lithium iron phosphate system. It is equipped with a graphite anode, a high-stability electrolyte and a high-strength aluminum casing. It belongs to the category of industrial-grade power energy storage batteries. The product has a standard square structure as a whole, with a regular appearance and a high degree of standardization in size, making it easy to connect multiple cells in series or parallel to form battery modules and battery packs, and it is suitable for large-scale integrated applications.
Material Advantages
Accurate matching of alloy grades: 3003 aluminum-manganese series
Through the dispersion strengthening of manganese element, 3003 alloy can increase the yield strength to 130-150MPa without significantly reducing the elongation, which is exactly in the balance range of "resistant to internal gas bulging" and "satisfied with deep drawing without cracking". This alloy is non-heat-treated, strengthened for Aluminum Case for 12V LiFePO4 Battery Pack Primatic Type Cell Aluminum Shell.
Uniformity control of grain structure
Coarse grains or mixed crystal structures are the microscopic sources of draw cracking. We conduct metallographic sampling inspections on each batch of base materials, and the proportion of equiaxed grains to be no less than 85%. The randomness of the grain orientation is verified through electron backscattered diffraction to avoid differences in drawing performance in different directions due to texture concentration.
Surface quality and passivation film engineering
The melting point of natural alumina film is as high as 2072°C, which is far higher than that of the aluminum matrix. If it is too thick or unevenly distributed, it will affect the stability of laser welding. We require the surface roughness Ra of the base material to be controlled at 0.2-0.4μm, and the oxide film thickness not to exceed 50nm. We can provide chemical passivation treatment according to demand to form a uniform for lto lithium cells Aluminum shell.
Environmental compatibility and long-life design
Strictly control high-potential impurities such as copper and nickel to avoid local micro-battery corrosion. For high voltage systems or extreme humidity environments, the inner wall ceramic coating or carbon coating can be customized to further improve chemical inertness. In addition, the 100% recyclability of the aluminum shell meets the purchasing requirements of European and American customers for Prismatic Cell for BYD brand.
Manufacturing process
Multi-pass deep drawing process
The transformation from a round aluminum sheet to a square container requires multiple drawings. The first drawing pulls the round blank into a shallow barrel shape, and each subsequent drawing gradually reduces the wall thickness, increases the height, and transitions the cross-section from circular to rectangular. The manufacturing of square aluminum shells is not a simple stamping process, but a precision manufacturing chain that covers multiple processes for Aluminum shell for single cell lithium ion battery.
Cleaning and surface treatment
After drawing is completed, drawing oil, aluminum powder and tiny chips remain on the surface of the shell. If these contaminants enter the subsequent injection and formation processes, they may cause internal micro-short circuits or contaminate the electrolyte. Therefore, professional production lines will be equipped with ultrasonic cleaning or high-temperature water-based cleaning lines, combined with multi-channel spraying and hot air drying, to ensure that the surface cleanliness of the shell reaches one millionth of a gram for Prismatic Cell for BYD brand.
Dimensions and air tightness testing
Square aluminum shells have extremely high requirements for dimensional accuracy - the shell mouth flatness, side wall verticality, corner radius and depth tolerances all need to be controlled within ±0.05mm. The modern production line uses online laser ranging and visual inspection systems to achieve 100% full inspection instead of random inspection. In terms of air tightness, the shell needs to withstand a certain pressure air tightness test before sealing to verify that there are no penetrating defects in the welds and base metal.
FAQ
Q: Is this square aluminum shell lithium iron phosphate battery suitable for use in outdoor open-air energy storage projects?
A: The aluminum shell of the product is anti-corrosive and dust-proof. When paired with a matching protective cabinet, it can be stably used in outdoor scenes. The battery core itself can adapt to changes in high and low temperature environments, meeting the requirements of overseas open-air energy storage, field engineering power supply and other working conditions.
Q: After the cells are connected in series and parallel to form a group, what is the balanced performance?
A: Relying on a strict parameter sorting process, the cells in the same batch have excellent consistency and good natural balancing effect after being grouped. When combined with the conventional BMS battery management system, long-term stable operation can be achieved without the need for frequent manual balancing maintenance.
Q: Does the product support export and are the relevant qualifications complete?
A: The products are produced in accordance with international standards and are equipped with complete test reports, compliance documents and relevant certifications. They can be exported to many countries and regions around the world to support customers in completing customs clearance and project access.
Q: Can the cell specifications be customized according to project requirements?
A: We have flexible production capabilities. Based on standard specifications, we can reasonably customize sizes, conventional electrical parameters, etc. We support small and medium-sized batch custom orders. We can communicate the project details to confirm the plan.
contact us
Relying on our mature LiFePo4 Prismatic Battery Aluminum Cells engineering manufacturing system and overseas project supporting experience, we can fully cooperate with various energy storage, power, and backup power engineering projects to complete cell selection, batch supply, and technology docking. Welcome to initiate an inquiry immediately to communicate project details.
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