USPTO Patent Granted for Battery Welding Inspection Device

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 24th, 2026

Detected March 26th, 2026

Summary

The USPTO has granted a patent (US12584875B2) to LG Energy Solution, Ltd. for a device and method to inspect the welded state of cylindrical secondary batteries. The patent describes a system using resistance probes to identify weak welds based on resistance values exceeding a critical threshold.

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What changed

The United States Patent and Trademark Office (USPTO) has granted patent US12584875B2 to LG Energy Solution, Ltd. for a device and method designed to inspect the welded state of cylindrical secondary batteries. The patented technology utilizes a resistance measurer with multiple probes to measure the resistance of welded portions coupling an electrode to an electrode tab. An inspector then compares these resistance values against a critical threshold, flagging any welded portion exceeding this value as having a weak weld, thereby ensuring the quality and reliability of battery components.

This patent grant is primarily informational for manufacturers in the battery sector, particularly those involved in the production of cylindrical secondary batteries. While it does not impose new regulatory obligations or compliance deadlines, it represents an advancement in quality control technology for battery manufacturing. Companies in this space, especially those producing batteries for electric vehicles or energy storage systems, may wish to review the patent to understand potential technological developments and competitive landscapes. The assignee, LG Energy Solution, Ltd., is a major player in the battery manufacturing industry.

Source document (simplified)

← USPTO Patent Grants

Device and method for inspecting welded state for cylindrical secondary battery

Grant US12584875B2 Kind: B2 Mar 24, 2026

Assignee

LG ENERGY SOLUTION, LTD.

Inventors

Jung Hoon Lee, Su Taek Jung, Seok Jin Kim, Ji Hoon Lee, Sang Hyun Koo, Min Wook Kim

Abstract

A device for inspecting a welded state of a plurality of welded portions coupling a non-coating portion of an electrode to an electrode tab includes a resistance measurer having a plurality of resistance measurement probes which respectively measure resistance values of the plurality of welded portions; and a resistance inspector which compares each of the resistance values of the plurality of welded portions, with a critical resistance value. When the resistance value of at least one welded portion among the plurality of welded portions exceeds the critical resistance value, the at least one welded portion is determined as having a weak welding. The plurality of resistance measurement probes respectively measure the resistance values of the plurality of welded portions while being respectively in contact with a non-welding surface disposed between the plurality of welded portions and non-welding surfaces outside outermost welded portions of the plurality of welded portions.