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JP-7857462-B1 - Ultrasonic bonding equipment

JP7857462B1JP 7857462 B1JP7857462 B1JP 7857462B1JP-7857462-B1

Abstract

[Challenge] To reliably join workpieces while suppressing structural complexity. [Solution] An ultrasonic bonding apparatus comprising a horn 1 and an anvil 2 that clamps a plurality of workpieces 3 and 4 in a first direction, wherein the horn 1 vibrates in a second direction perpendicular to the first direction, and the anvil 2 comprises a support 10 and an oscillating body 11 that abuts against the workpiece 4 and is supported by the support 10 so as to be rotatable about a pivot axis 16 along a third direction perpendicular to the first and second directions, and vibrates at the same frequency as the horn 1 but with a different phase. [Selection Diagram] Figure 3

Inventors

  • 山▲崎▼ 裕司
  • 小池 優季史

Assignees

  • 小池産業株式会社

Dates

Publication Date
20260512
Application Date
20250314

Claims (9)

  1. An ultrasonic bonding apparatus comprising a horn and an anvil for clamping multiple workpieces in a first direction, wherein the horn vibrates in a second direction perpendicular to the first direction, Anvil, Support and A oscillating body that contacts the workpiece and is supported by a support so as to be rotatable about a pivot axis along a third direction perpendicular to the first and second directions, and that vibrates at the same frequency as the horn but with a different phase, An ultrasonic bonding device equipped with the following features.
  2. The horn has a horn contact portion that contacts the workpiece. The oscillating body has an anvil contact portion that contacts the workpiece. The ultrasonic bonding apparatus according to claim 1, wherein, when viewed in a third direction, the horn contact portion, the anvil contact portion, and the rotation axis are aligned in a straight line along the first direction.
  3. The ultrasonic bonding apparatus according to claim 2, further comprising a limiting stopper that faces the oscillating body through a gap and contacts the oscillating body to limit its amplitude when the amplitude exceeds a certain level.
  4. The oscillating body has an end on the support side in the first direction and an oscillating base portion extending in the second direction. The ultrasonic bonding apparatus according to claim 3, wherein the limiting stopper is provided on the support and abuts in the first direction against the end of the oscillating base portion in the second direction.
  5. The ultrasonic bonding apparatus according to claim 4, wherein the limiting stopper is provided on the support so as to be adjustable in a first direction.
  6. The horn has a horn contact portion that contacts the workpiece. The oscillating body has an anvil contact portion that contacts the workpiece. The ultrasonic bonding apparatus according to claim 1, wherein the amplitude of the anvil contact portion in the second direction is smaller than the amplitude of the horn contact portion in the second direction.
  7. The ultrasonic bonding apparatus according to claim 6, wherein the amplitude of the anvil contact portion in the second direction is 20% or more of the amplitude of the horn contact portion in the second direction.
  8. The ultrasonic bonding apparatus according to claim 7, wherein the amplitude of the anvil contact portion in the second direction is 5 μm or more in P-P value.
  9. An anvil for an ultrasonic bonding apparatus, which clamps multiple workpieces in the first direction together with a horn that vibrates in a second direction perpendicular to the first direction, Support and A oscillating body that contacts the workpiece and is supported by a support so as to be rotatable about a pivot axis along a third direction perpendicular to the first and second directions, and that vibrates at the same frequency as the horn but with a different phase, An anvil for an ultrasonic bonding device.

Description

This invention relates to an ultrasonic bonding apparatus that joins multiple workpieces together using ultrasonic vibrations. When joining multiple workpieces using ultrasonic vibration, the workpieces are held, for example, vertically between a horn and an anvil. The horn is then vibrated laterally to join the workpieces (see Patent Document 1 below). However, if the workpieces are made of dissimilar metals, i.e., dissimilar metal joining, the joining strength is often insufficient, and damage to the workpieces may occur. Furthermore, even when joining multilayer electrode foils used in large batteries to current collector tabs, joining all of the multilayer electrode foils to the current collector tabs is not easy. On the other hand, as shown in Patent Document 2 below, there are also devices in which horns are arranged on both sides of the workpiece, but these have a complex structure. Japanese Patent Publication No. 2000-301356Japanese Patent Application Publication No. 7-323478 A perspective view showing the anvil of an ultrasonic bonding apparatus in one embodiment of the present invention.A floor plan of the anvil.Front view of the anvil.A front view of the main components showing the workpiece joining state by the device.A cross-sectional view along line A-A in Figure 1.Enlarged view of the main part of Figure 5.Cross-sectional view of the main part along line B-B in Figure 1.(a) through (c) are schematic diagrams showing the movement of the oscillating body of the anvil.Disassembled perspective view of the spring of the same anvil.A plan view showing the oscillating table of the anvil's oscillating body.Bottom view of the rocking table.Bottom view of the rocking table.Plan view of the support table for the anvil.Plan view of the support table.Front view showing the anvil of an ultrasonic bonding apparatus in another embodiment of the present invention. The following describes an ultrasonic bonding apparatus according to one embodiment of the present invention, with reference to Figures 1 to 14. The ultrasonic bonding apparatus (hereinafter simply referred to as "the apparatus") comprises a horn 1 and an anvil 2 arranged to face each other in the vertical direction, as shown in Figures 1 to 4. In the following description, the first direction is defined as the vertical direction, the second direction perpendicular to the first direction is defined as the left-right direction, and the third direction perpendicular to both the first and second directions is defined as the front-back direction. In the figures, the vertical, left-right, and front-back directions are indicated by arrows Z, X, and Y, respectively. However, the directions from the first to the third direction may be arbitrary. The device joins multiple workpieces together. The workpieces are typically made of metals or resins. The device is particularly suitable for joining metals together, and also for joining dissimilar metals. Examples include joining multilayer foil electrodes, electrode tabs, electrode busbars, and clad electrode components. In this embodiment, multiple workpieces are designated as the first workpiece 3 and the second workpiece 4. The first workpiece 3 and the second workpiece 4 are stacked on top of each other. For example, the first workpiece 3 is stacked on top of the second workpiece 4. The stacked first workpiece 3 and second workpiece 4 are placed on the anvil 2. As shown in Figure 4, the first workpiece 3 and the second workpiece 4 are held between the horn 1 and the anvil 2 from above and below. Therefore, the horn 1 abuts the upper surface of the first workpiece 3, and the anvil 2 abuts the lower surface of the second workpiece 4. The horn 1 presses downwards against the first workpiece 3 and the second workpiece 4. The anvil 2 supports the first workpiece 3 and the second workpiece 4 from below. Therefore, the first workpiece 3 and the second workpiece 4 receive a downward force from the horn 1 and an upward force from the anvil 2. The horn 1 is equipped with a horn tip 5. The tip of the horn tip 5 faces downwards; that is, the horn tip 5 faces the anvil 2. The horn tip 5 has a horn contact portion 6 on its tip surface, i.e., its lower end surface, which contacts the first workpiece 3. The horn contact portion 6 is formed over the entire lower end surface of the horn tip 5. The horn contact portion 6 is a plane with its normal direction in the vertical direction. Preferably, the horn contact portion 6 has many fine irregularities, which can increase the frictional resistance between the horn contact portion 6 and the first workpiece 3. The horn contact portion 6 vibrates in the left-right direction. Note that the horn contact portion 6 only needs to vibrate in the left-right direction; it may also vibrate in the front-back direction, etc. The resonant frequency of the horn contact portion 6 can vary and can be set to any frequency. The amplitude of the horn contact portion 6 may also be settable. The device