---
publication_id: "OT-2026-000000730"
title: "Ultrasonic horn, secondary battery, and method for manufacturing secondary battery"
published_at: "2026-09-15T19:03:18.780855Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000000730"
categories:
  - "manufacturing-assembly-equipment/joining-and-welding"
keywords:
  - "b23k20/10"
  - "b23k20/106"
  - "b23k20/26"
  - "b23k2101/36"
  - "b23k37/0408"
  - "h01m10/0587"
---

# Ultrasonic horn, secondary battery, and method for manufacturing secondary battery

## Abstract

An ultrasonic horn reduces the likelihood of damaging a plurality of stacked sheets of metal foil when the stacked sheets and a metal member are ultrasonically bonded by applying ultrasonic vibration to the stacked sheets. An ultrasonic horn is used for ultrasonically bonding a plurality of stacked sheets of negative electrode foil and a negative electrode collector plate by applying ultrasonic vibration to the stacked sheets of negative electrode foil. The horn includes a horn body, a first protrusion having a first surface that is a curved surface and protruding from an opposing surface of the horn body facing the anvil toward the anvil, and a second protrusion provided at a center of the first surface of the first protrusion and protruding toward the anvil. The second protrusion includes an end surface that is a planar surface and a second surface connecting the end surface and the first surface.