Power battery cell manufacturing process: analysis of square aluminum shell battery packaging process
Apr 16, 2026
The core value of Power battery cell encapsulation
Battery packaging is a key core process in the later stage of Lithium solar batteries manufacturing, and it is also an important protective structure to ensure the safe and stable operation of batteries throughout their entire lifecycle. Encapsulation can not only achieve high-strength sealing, isolate external water vapor and oxygen intrusion, prevent internal electrolyte leakage, and avoid chemical side reactions in batteries, but also rely on a hard shell to form a stable mechanical structure to resist external damage caused by compression, collision, and vibration.
On the basis of sealed protection, the packaging structure of Lithium-ion batteries also integrates pressure relief and explosion-proof design, insulation sealing components, and conductive pole structure, forming a reasonable balance between closed protection and safe pressure relief. It is a systematic engineering that balances performance and operational safety.
Mainstream packaging structures and processes
Power battery cell is currently the mainstream form in the field of power energy storage, commonly using aluminum alloy shell, stamped and die cast into one, with a regular structure and strong spatial adaptability. In the packaging process, the wound or stacked cell is installed inside the aluminum shell to complete the conductive connection between the pole ear and the top cover pole. The pole pole pole and the cover plate are matched with an insulation sealing structure to achieve isolation protection and sealing isolation.
The closure and sealing of the top cover and shell are mainly achieved through high-precision laser welding technology. After welding, precise testing methods such as helium leak detection are required to identify weld defects and ensure overall sealing performance in all aspects. The regular square structure is more suitable for the dense arrangement and assembly of Lifepo4 power cell modules, forming a good balance between structural strength, energy density, and production cost.
Packaging Quality Evaluation Criteria
The quality of packaging technology directly determines the yield and long-term stability of Lithium superpack batteries, and the industry has established standardized quantitative testing indicators. The sealing performance is based on high-precision leak testing, strictly controlling the overall leakage standard to prevent problems such as leakage and bulging during long-term use.
At the same time, it is necessary to conduct mechanical tests on the strength of the shell structure to avoid hidden dangers such as stress concentration and compression damage. In addition, it is necessary to verify the opening pressure accuracy of the explosion-proof pressure relief structure to ensure controllable pressure relief in case of abnormal gas production in the Lithium battery pack. Combined with insulation performance testing, it is necessary to ensure effective isolation between live parts and aluminum shell casings, and to control the comprehensive quality of the packaging from multiple dimensions.
Development Trends of Packaging Technology
Solar energy storage systems lithium batteries pack Packaging technology is constantly optimized and upgraded between sealing safety, structural lightweighting, and process simplification. With the development of integrated manufacturing technology, the industry is gradually relying on integrated solutions to simplify packaging levels, reduce the number of components, and lower the risk of assembly defects. By optimizing the shell material and wall thickness design, lightweight upgrades can be achieved while ensuring structural strength, further improving battery energy density.
At the same time, high-precision welding, automated sealing assembly, and full process online inspection are continuously popularized, continuously improving packaging consistency and production efficiency, providing process support for the large-scale application of Rechargeable brand new batteries in new energy, energy storage, and other fields.
Contact us
If you need to learn about Power battery cell packaging process optimization, structural design, and production-related consulting, please feel free to communicate and connect at any time. We rely on mature industry technology accumulation to provide professional process solutions and technical support. We look forward to working together with you for a win-win situation.
