USPTO Patent Granted for Secondary Battery Manufacturing Method

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 24th, 2026

Detected March 26th, 2026

Summary

The USPTO has granted a patent (US12586874B2) to PRIME PLANET ENERGY & SOLUTIONS, INC. for a secondary battery manufacturing method. The patent describes a technique to reduce voids between electrode tabs and current collectors during welding, aiming to improve battery quality and reliability.

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What changed

The United States Patent and Trademark Office (USPTO) has granted patent US12586874B2 for a secondary battery manufacturing method to PRIME PLANET ENERGY & SOLUTIONS, INC. The patent specifically addresses a technique for welding electrode tabs to current collecting units by using a transparent material as a backing, which aims to reduce voids and improve the integrity of the connection. The patent was filed on January 6, 2023, and granted on March 24, 2026.

This patent grant is primarily an intellectual property event and does not impose new regulatory obligations on manufacturers. However, companies involved in secondary battery manufacturing, particularly those utilizing laser welding techniques for electrode assembly, should be aware of this patented technology. Companies may need to conduct freedom-to-operate analyses to ensure their manufacturing processes do not infringe on this patent.

Source document (simplified)

← USPTO Patent Grants

Secondary battery and method of manufacturing the same

Grant US12586874B2 Kind: B2 Mar 24, 2026

Assignee

PRIME PLANET ENERGY & SOLUTIONS, INC.

Inventors

Yoshitaka Matsumasa, Tomokazu Yamanaka

Abstract

Provided is a technique to reduce voids between an electrode tab and a current collecting unit in a portion where the electrode tab and the current collecting unit are welded. The secondary battery manufacturing method disclosed herein is a method of manufacturing a secondary battery including an electrode body having an electrode tab and a current collecting unit electrically connected to the electrode body. This method includes: welding between the electrode tab and the current collecting unit, by sandwiching the electrode tab between a transparent material and the current collecting unit and then applying laser to penetrate the transparent material.