Aluminum case cylindrical battery structure with polarity pole end injection type

The pole-end liquid injection design for aluminum case cylindrical batteries addresses slag removal, overcurrent capacity, and structural complexity issues, improving production efficiency and reducing costs by eliminating multiple inversions and optimizing internal space.

JP2026524743APending Publication Date: 2026-07-24YANTAI LIHUA ELECTRIC POWER TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
YANTAI LIHUA ELECTRIC POWER TECHNOLOGY CO LTD
Filing Date
2025-06-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The existing manufacturing process of aluminum case cylindrical batteries faces issues such as ineffective removal of welding slag at the negative electrode end, low overcurrent capacity, complex and costly positive electrode structure, and the need to invert the battery multiple times, leading to increased equipment costs and internal space occupation.

Method used

A cylindrical aluminum case battery structure with a pole-end liquid injection design, featuring a negative electrode current collector plate laser-welded to a stud flange, a sealing gasket between the stud and case, and a nut secured by laser welding, along with a simplified positive terminal using a cover plate and explosion-proof valve, and injection holes for top liquid injection.

Benefits of technology

This design eliminates welding slag, enhances overcurrent capacity, reduces production complexity and costs, and optimizes internal space utilization while allowing flexible material selection for nuts and reliable sealing.

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Abstract

This invention relates to the technical field of cylindrical batteries, and more particularly to an aluminum case cylindrical battery structure with electrode post end injection. The structure includes a case, the case is provided with a winding core, the upper part of the winding core is the negative pole, and the bottom part of the winding core is the positive pole. The positive pole includes a cover plate, the edge of which is laser-welded to the bottom of the case, and the bottom of which is laser-welded to the positive electrode tab of the winding core. An explosion-proof valve is provided in the center of the cover plate. An injection hole for injecting the electrolyte is provided in the center of the negative electrode current collector plate and stud. The structure of the positive pole is simplified, the cost of structural components is significantly reduced, and the internal space of the battery is effectively utilized. In addition, the conventional bottom injection method is changed to injection from the top, reducing the number of times the cylindrical battery needs to be inverted, simplifying the process, and lowering capital investment costs. After injection and chemical treatment, a sealing nail is inserted into the injection hole of the stud, and the area between the tip of the sealing nail and the stud is laser-welded to ensure reliable sealing and electrical connection.
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