Ultrasonic welding multi-tab semi-solid lithium battery end cover assembly and ultrasonic welding equipment

By introducing flexible metal current guide plates and support structures into the end cap assembly of multi-tab semi-solid lithium batteries, the problems of poor soldering and cap deformation in multi-tab semi-solid lithium batteries have been solved, achieving high-quality welding and high current conduction.

CN224355319UActive Publication Date: 2026-06-12GUANGDONG NUODA SMART ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG NUODA SMART ENERGY TECH CO LTD
Filing Date
2025-04-27
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Multi-tab semi-solid lithium batteries have poor flatness and are thick after the flattening process, which leads to a high probability of poor soldering. In addition, the low-rigidity cap is prone to deformation during ultrasonic welding, making it difficult to meet the high current requirements.

⚗Method used

Design an end cap assembly including a sealing ring, a top cap, an explosion-proof valve, and a flexible metal guide plate. By fitting an installation groove onto the welding table of an ultrasonic welding equipment, the flexibility of the flexible metal guide plate and the support of the ultrasonic welding table are utilized to reduce the probability of incomplete welds and improve conductivity.

🎯Benefits of technology

It effectively reduces the probability of poor soldering, avoids cap deformation, meets high current requirements, and simplifies the assembly process of the end cap assembly and the steel shell.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224355319U_ABST
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Abstract

The present disclosure provides an end cover assembly for multi-pole lug semi-solid lithium battery based on ultrasonic welding and an ultrasonic welding device. The inner peripheral wall of the sealing ring of the end cover assembly is sleeved with the outer peripheral edge of the top cover to form a containing groove, the overcurrent protection sheet and the explosion-proof valve are sequentially clamped in the containing groove, and the explosion-proof valve and the sealing ring form a mounting groove for sleeving on the welding table of the ultrasonic welding device, and the explosion-proof valve and the welding table are in movable abutment. The end cover assembly further comprises a flexible metal flow guide sheet, one end of the flexible metal flow guide sheet is welded and fixed to the side of the top cover away from the explosion-proof valve, and the other end of the flexible metal flow guide sheet is used for welding and fixing the thick lug part of the winding core of the multi-pole lug semi-solid lithium battery. The end cover assembly not only reduces the probability of false welding of the end cover assembly and the thick lug part of the winding core, but also meets the demand of large current, and avoids the problem of ultrasonic deformation of the traditional end cap with low rigidity.
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