JP2011000611A - Ultrasonic bonding apparatus and ultrasonic bonding method - Google Patents

Abstract

An ultrasonic bonding apparatus and an ultrasonic bonding method for preventing deformation of a workpiece caused by ultrasonic bonding are provided.
An ultrasonic bonding apparatus (100) presses a plate-like first work (30) and a plate-like second work (12) between a horn (110) and an anvil (120) for applying ultrasonic vibration, The first workpiece and the second workpiece are joined by applying ultrasonic vibration. The second workpiece is softer than the first workpiece. The ultrasonic bonding apparatus has a pressing portion 150 that presses the float 17 of the second workpiece after the ultrasonic vibration stops, and protrudes from the end portion of the first workpiece after the pressing portion presses the lift. It has the bending part 160 which bends the edge part 15 of a 2nd workpiece | work. The bent portion bends the end portion of the second workpiece so as to sandwich the end portion of the first workpiece.
[Selection] Figure 1

Description

  The present invention relates to an ultrasonic bonding apparatus and an ultrasonic bonding method.

  An ultrasonic bonding apparatus is an apparatus that performs solid-phase bonding by sandwiching two plate-shaped workpieces between a horn and anvil that apply ultrasonic vibration and applying pressure to the two workpieces. (For example, refer to Patent Document 1). When ultrasonic bonding is performed, two workpieces are rubbed to remove impurities such as an oxide film, and clean surfaces (new surfaces) of the workpieces are brought into contact with each other. Solid phase bonding is performed by the generated frictional heat.

JP 2008-68261 A

  However, if one of the two workpieces is softer than the other, there is a risk that the soft one will float due to wrinkles or warpage when ultrasonic vibrations are applied, leading to deformation of the workpiece and eventually quality degradation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an ultrasonic bonding apparatus and an ultrasonic bonding method that prevent deformation of a workpiece caused by ultrasonic bonding.

  In order to achieve the above object, an ultrasonic bonding apparatus of the present invention pressurizes a plate-like first work and a plate-like second work between a horn and an anvil that provide ultrasonic vibration. The first workpiece and the second workpiece are joined by applying ultrasonic vibration. The second workpiece is softer than the first workpiece. The ultrasonic bonding apparatus of the present invention has a pressing portion that presses the floating of the second workpiece after the ultrasonic vibration stops, and after the pressing portion presses the floating, from the end of the first workpiece It has a bent part that bends the end of the protruding second workpiece. The bent portion bends the end portion of the second workpiece so as to sandwich the end portion of the first workpiece.

  In order to achieve the above object, an ultrasonic bonding apparatus of the present invention pressurizes a plate-like first work and a plate-like second work between a horn and an anvil that provide ultrasonic vibration. The first workpiece and the second workpiece are joined by applying ultrasonic vibration. The second workpiece is softer than the first workpiece, and the ultrasonic bonding apparatus of the present invention has a roller that presses the second workpiece when applying ultrasonic vibration.

  In order to achieve the above object, the ultrasonic bonding method of the present invention pressurizes a plate-like first workpiece and a plate-like second workpiece between a horn and an anvil that provide ultrasonic vibration. The first workpiece and the second workpiece are joined by applying ultrasonic vibration. The second workpiece is softer than the first workpiece. In the ultrasonic bonding method of the present invention, after the ultrasonic vibration stops, a pressing step of pressing the floating of the second workpiece, and the end of the second workpiece protruding from the end of the first workpiece after the pressing step. A bending step of bending the portion. In the bending step, the end portion of the second workpiece is bent so as to sandwich the end portion of the first workpiece.

  In order to achieve the above object, the ultrasonic bonding method of the present invention pressurizes a plate-like first workpiece and a plate-like second workpiece between a horn and an anvil that provide ultrasonic vibration. The first workpiece and the second workpiece are joined by applying ultrasonic vibration. The second workpiece is softer than the first workpiece, and the ultrasonic bonding method of the present invention has a pressing step of pressing the second workpiece with a roller when applying ultrasonic vibration.

  In the ultrasonic bonding apparatus of the present invention, the floating is pressed by the pressing portion, and the end of the second workpiece is bent in that state to fix the first workpiece and the second workpiece. Can be prevented from being deformed.

  Since the ultrasonic bonding apparatus of the present invention presses the second workpiece with the roller when applying ultrasonic vibration, the float is suppressed and deformation of the workpiece can be prevented.

  The ultrasonic bonding method of the present invention holds the float in the pressing step, and in that state, the end of the second workpiece is bent in the bending step to fix the first workpiece and the second workpiece. It is possible to prevent deformation of the workpiece.

  In the ultrasonic bonding method of the present invention, in the pressing step, the second workpiece is pressed by the roller when applying ultrasonic vibration, so that the floating is suppressed and deformation of the workpiece can be prevented.

It is a schematic block diagram of an ultrasonic bonding apparatus. It is the schematic for demonstrating operation | movement of a press part and a bending part. It is a schematic perspective view of a battery. It is an expansion schematic plan view of an electrode tab. It is a flowchart for demonstrating the ultrasonic bonding method of 1st Embodiment. It is a partial expansion schematic diagram of the ultrasonic bonding apparatus of a 1st embodiment. It is a partial expansion schematic diagram of the ultrasonic bonding apparatus of a 1st embodiment. It is a partial expansion schematic diagram of the ultrasonic bonding apparatus of a 1st embodiment. It is a partial expansion schematic diagram of the ultrasonic bonding apparatus of a 1st embodiment. It is an expansion schematic plan view of the other example of an electrode tab. It is an expansion schematic plan view of an electrode tab. It is a flowchart for demonstrating the ultrasonic bonding method of 2nd Embodiment. It is the partial expansion schematic of the ultrasonic bonding apparatus of 2nd Embodiment. It is the partial expansion schematic of the ultrasonic bonding apparatus of 2nd Embodiment. It is a partial expansion schematic plan view of the ultrasonic bonding apparatus of the second embodiment. It is a partial expansion schematic diagram of other examples of an ultrasonic joining device. It is a partial expansion schematic diagram of other examples of an ultrasonic joining device. It is a partial expansion schematic diagram of other examples of an ultrasonic joining device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, members having functions common to the respective embodiments are denoted by similar reference numerals, and redundant description is omitted.

<First Embodiment>
Briefly referring to FIG. 1, the ultrasonic bonding apparatus 100 according to the first embodiment is used for manufacturing an assembled battery formed by electrically connecting a plurality of batteries 10, and includes electrode tabs 12 for taking out electric power from the batteries 10. The bus bar 30 for electrically connecting the electrode tabs of the different batteries 10 is joined. The ultrasonic bonding apparatus 100 presses the plate-like bus bar 30 (first work) and the plate-like electrode tab 12 (second work), and joins them by applying ultrasonic vibration. .

  The ultrasonic bonding apparatus 100 includes a horn 110 and an anvil 120 that apply ultrasonic vibration while applying pressure to bond the bus bar 30 and the electrode tab 12, and an ultrasonic bonding apparatus main body 130 connected to the horn 110. The ultrasonic bonding apparatus 100 also has a pressing part 150 and a bent part 160 for correcting the electrode tab 12. Further, the ultrasonic bonding apparatus 100 includes a control unit 140 that controls the operation of each component of the ultrasonic bonding apparatus 100. The control unit 140 has a configuration mainly composed of a CPU and a memory.

  The horn 110 can be repositioned relative to the anvil 120 and has a plurality of protrusions 112 at the tip. The anvil 120 also has a plurality of protrusions 122 at the tip. The protrusion 112 of the horn 110 is finer than the protrusion 122 of the anvil 120 in order to sufficiently penetrate the electrode tab 12 following the ultrasonic vibration.

  The ultrasonic bonding apparatus main body 130 includes a drive unit 131 for vibrating the horn 110 and a high-frequency power source 132 electrically connected to the drive unit 131. The drive unit 131 is, for example, an ultrasonic oscillator or a vibrator, and vibrates the horn 110 in the surface direction of the electrode tab 12.

  The pressing portion 150 includes a receiver 151 (first contact portion) and a clamp 152 (second contact portion) that sandwich the electrode tab 12 and the bus bar 30. The pressing unit 150 also has a pneumatic cylinder 153 for driving the clamp 152.

  The receiver 151 abuts on the bus bar 30 and supports the bus bar 30 and the electrode tab 12. The receptacle 151 has a higher thermal conductivity than the bus bar 30. The receiver 151 can be slid by a driving device (not shown), for example, a motor, and the control unit 140 controls the movement of the receiver 151.

  The clamp 152 is moved close to and away from the electrode tab 12 by the pneumatic cylinder 153 and abuts against the electrode tab 12. The clamp 152 has a lower thermal conductivity than the electrode tab 12. The clamp 152 is a plate-like member and is connected to the piston rod of the pneumatic cylinder 153 at the end.

  The bent portion 160 includes a block 161 for pressing against the end portion 15 of the electrode tab 12, a clamp 162 for pressing the block 161, and a pneumatic cylinder 163 for driving the clamp 162.

  The block 161 is fitted in a through hole (not shown) penetrating the clamp 152 and can move in the thickness direction of the clamp 152. The clamp 162 is a plate-like member and is connected to the piston rod of the pneumatic cylinder 163 at the end. The clamp 162 is moved close to and away from the block 161 by the pneumatic cylinder 163, and presses the block 161 to be pushed into a through hole provided in the clamp 152. The through hole provided in the clamp 152 includes a guide (not shown) for guiding the block 161.

  The operation of the pressing part 150 and the bent part 160 will be described with reference to FIG.

  As shown in FIG. 2A, the pressing portion 150 raises the end portion of the clamp 152 opposite to the side connected to the piston rod by contracting the piston rod of the pneumatic cylinder 153. This separates the clamp 152 from the electrode tab 12.

  On the other hand, as shown in FIG. 2B, the pressing portion 150 extends the piston rod of the pneumatic cylinder 153, thereby lowering the end of the clamp 152 opposite to the side connected to the piston rod. In this way, the clamp 152 is close to the electrode tab 12.

  As shown in FIG. 2C, the bent portion 160 extends the piston rod of the pneumatic cylinder 163 to lower the end of the clamp 162 opposite to the side connected to the piston rod, and is blocked by the clamp 162. 161 is pressed. The pressed block 161 protrudes in the thickness direction of the clamp 152 from a through hole provided in the clamp 152. When the clamp 162 further presses the block 161, as shown in FIG. 2D, the collar 164 provided in the block 161 hits the support bar 154 provided in the through hole of the clamp 152, and the support bar 154 is moved. It moves to rotate as a fulcrum.

  As shown in FIG. 3, the battery 10 is flat and has a rectangular shape. The battery 10 is a secondary battery such as a lithium ion secondary battery. The battery 10 has a configuration in which a power generation element (not shown) in which charge / discharge reaction actually proceeds is sealed with an exterior material 14 such as a laminate sheet. The electrode tab 12 is electrically connected to the power generation element, and is drawn from the exterior material 14. One of the two electrode tabs 12 shown in the figure is a positive electrode tab and the other is a negative electrode tab.

  As shown in FIG. 4, the end 15 of the electrode tab 12 has a concave shape that is recessed in the vibration direction 114 of the horn 110 in plan view. The horn 110 applies ultrasonic vibration while pressing the substantially central portion 16 of the electrode tab 12. The length L1 of the electrode tab 12 in the vibration direction 114 of the horn 110 may be the same as the length of the bus bar 30, but is longer than the length of the bus bar 30 and the end 15 of the electrode tab 12 is the end of the bus bar 30. It is preferable that it protrudes from the part.

  The electrode tab 12 has rigidity (hardness) different from that of the bus bar 30. The material strength of the electrode tab 12 is lower than that of the bus bar 30 and is softer than that of the bus bar 30. The electrode tab 12 is made of, for example, an aluminum alloy, and the bus bar 30 is made of, for example, a copper alloy.

  Next, the ultrasonic bonding method according to the first embodiment will be described.

  As shown in FIG. 5, the ultrasonic bonding method includes a bonding step S <b> 110 in which the bus bar 30 and the electrode tab 12 are ultrasonically bonded. The ultrasonic bonding method also includes a pressing step S120 and a bending step S130 for correcting the electrode tab 12.

  As shown in FIG. 6, in the joining step S <b> 110, the bus bar 30 and the electrode tab 12 are sandwiched and pressed between the horn 110 and the anvil 120, and these are joined by applying ultrasonic vibration. At this time, the pressing portion 150 separates the clamp 152 from the electrode tab 12 and does not hinder the vibration of the electrode tab 12.

  In the bonding step S110, the bus bar 30 and the electrode tab 12 are rubbed to remove impurities such as an oxide film, and the clean surfaces (new surfaces) come into contact with each other. The bus bar 30 and the electrode tab 12 are solid-phase bonded by the generated frictional heat.

  However, since the electrode tab 12 is relatively softer than the bus bar 30, when ultrasonic vibration is applied, there is a possibility that a float 17 is generated at the end 15 of the electrode tab 12 due to warping. The float 17 is a portion where a gap is generated between the electrode tab 12 and the bus bar 30.

  As shown in FIG. 7, the pressing step S120 presses the float 17 of the electrode tab 12 after the ultrasonic vibration stops. In the pressing step S120, after the ultrasonic vibration is stopped, the pressing unit 150 extends the piston rod of the pneumatic cylinder 153 and brings the clamp 152 into contact with the float 17 to press it.

  A length L2 from the horn 110 to the tip of the clamp 152 is, for example, 0.5 mm to 1.0 mm. The length L3 from the tip of the clamp 152 to the block 161 is, for example, 0.5 ± 0.1 mm.

  As shown in FIG. 8, in the bending step S130, after the pressing step S120, the end portion 15 of the electrode tab 12 protruding from the end portion of the bus bar 30 is bent so as to sandwich the end portion of the bus bar 30. In the bending step S <b> 130, the bending portion 160 extends the piston rod of the pneumatic cylinder 163 and presses the block 161 by the clamp 162. The block 161 first bends the end 15 of the electrode tab 12 protruding from the end of the bus bar 30 at a substantially right angle. When the clamp 162 further presses the block 161, the block 161 moves so as to rotate about the support bar 154, and the end 15 of the electrode tab 12 is bent so as to sandwich the end of the bus bar 30. In order to bend the end 15 of the electrode tab 12 smoothly, the receiver 151 has a recess 156 for avoiding interference with the tip of the bent electrode tab 12. The end 15 of the electrode tab 12 is deformed with reference to the corner 155 of the receiver 151.

  Immediately after the ultrasonic vibration of the horn 110 stops, while the horn 110 and the anvil 120 are stationary with the bus bar 30 and the electrode tab 12 being pressed, the pressing step S120 presses the float 17 and the bending step S130. Bends the end 15 of the electrode tab 12. Immediately after stopping the ultrasonic vibration, the controller 140 keeps the horn 110 and the anvil 120 stationary with the bus bar 30 and the electrode tab 12 being pressed. In this state, as described above, the pressing portion 150 presses the float 17 and the bent portion 160 bends the end portion 15 of the electrode tab 12.

  As shown in FIG. 9, after the folding step S130, the control unit 140 separates the horn 110 and the clamp 152 from the electrode tab 12, and slides the receiver 151 away from the end of the bus bar 30. Prepare for the next task.

  The effect of the first embodiment will be described.

  In the ultrasonic bonding apparatus 100, the float 17 is pressed by the pressing portion 150, and the end 15 of the electrode tab 12 is bent in this state to fix the bus bar 30 and the electrode tab 12. Can be prevented from being deformed.

  If the electrode tab 12 has the float 17, for example, when a trim part is attached to the electrode tab 12, or when a battery module is inserted into a module can in which the assembled battery is stored, an object interferes with the float 17. There is a possibility that the electrode tab 12 is peeled off or the electrode tab 12 is unintentionally bent. Further, if the electrode tab 12 has the float 17, when the batteries 10 are stacked to form an assembled battery, the electrode tabs 12 may be in contact with each other via the float 17 in the adjacent batteries 10, leading to a short circuit. That is, the float 17 of the electrode tab 12 may cause a decrease in quality and yield. However, the ultrasonic bonding apparatus 100 can prevent the deformation of the electrode tab 12 by leveling the float 17 as described above, and thus can suppress deterioration in quality and yield.

  Since the ultrasonic bonding apparatus 100 fixes the bus bar 30 and the electrode tab 12 by bending the end 15 of the electrode tab 12, the bus bar 30 and the electrode tab 12 are thickened by a hydraulic cylinder or the like, for example, like a mechanical clinch. The applied force can be reduced compared to the case of joining by squeezing from the direction. Therefore, a relatively simple configuration such as a pneumatic cylinder is sufficient, and the apparatus can be made compact.

  In the ultrasonic bonding apparatus 100, immediately after the ultrasonic vibration is stopped, the pressing portion 150 presses the float 17, and the bent portion 160 bends the end portion 15 of the electrode tab 12. That is, in a state where the electrode tab 12 is softened by the heat generated by the ultrasonic vibration, the pressing portion 150 presses the float 17, and the bent portion 160 bends the end portion 15 of the electrode tab 12. For this reason, it can be deformed with a smaller force than at room temperature. And since it can deform | transform with a smaller force, the load concerning the junction part of the electrode tab 12 and the bus-bar 30 which were joined by ultrasonic joining is also small, and joining strength and quality can be ensured.

  The ultrasonic bonding apparatus 100 includes a clamp 152 having a thermal conductivity lower than that of the electrode tab 12, and presses the float 17 by bringing the clamp 152 into contact with the electrode tab 12, so that the electrode tab 12 generated by ultrasonic vibration is pressed. It is difficult for heat to escape to the clamp 152. For this reason, cooling of the electrode tab 12 is suppressed, and the electrode tab 12 can be deformed in a softened state. Therefore, the force required for deformation can be reduced.

  In addition, since the ultrasonic bonding apparatus 100 includes the receiver 151 having a higher thermal conductivity than the bus bar 30, and the receiver 151 is brought into contact with the bus bar 30, the heat of the bus bar 30 generated by the ultrasonic vibration easily escapes to the receiver 151. . For this reason, the bus bar 30 is easy to cool and harden, and the deformation of the bus bar 30 can be suppressed when the float 17 is pressed and the end 15 of the electrode tab 12 is bent. In addition, when the end 15 of the electrode tab 12 is bent, the bus bar 30 is difficult to deform together with the electrode tab 12, so that the electrode tab 12 can be firmly fixed to the bus bar 30.

  As shown in FIG. 10, unlike the present embodiment, when the shape of the electrode tab 12A in a plan view is a substantially rectangular shape, the electrode tab 12A is deformed due to heat and plastic deformation due to ultrasonic vibration, and the end center 18A. Elongates and protrudes compared to the end 17A. When the end 15A of the electrode tab 12A is bent, the end 17A is less likely to sandwich the bus bar 30 than the protruding end center 18A.

  On the other hand, as shown in FIG. 11, in the ultrasonic bonding apparatus 100 according to the present embodiment, the end 15 of the electrode tab 12 has a concave shape that is recessed in the vibration direction 114 of the horn 110 in plan view. When vibration is applied and stretched, the shape of the electrode tab 12 becomes a substantially rectangular shape. When the end 15 of the electrode tab 12 is bent, the end of the bus bar 30 is uniformly sandwiched by the entire end of the electrode tab 12, so that the electrode tab 12 can be firmly fixed to the bus bar 30.

  Even if the end 15 of the electrode tab 12 and the end of the bus bar 30 are aligned before the ultrasonic vibration is applied, the electrode tab 12 extends and protrudes from the end of the bus bar 30 by applying the ultrasonic vibration. The end 15 of the electrode tab 12 can be bent so as to sandwich the end of the bus bar 30. In this embodiment, before applying the ultrasonic vibration, the end 15 of the electrode tab 12 is provided in advance so as to protrude from the end of the bus bar 30. Therefore, after applying the ultrasonic vibration, it protrudes from the end of the bus bar 30. The length of the part can be made longer. Therefore, the electrode tab 12 can be firmly fixed to the bus bar 30 when bent.

  In the ultrasonic bonding method, the float 17 is pressed in the pressing step S120, and in this state, the end 15 of the electrode tab 12 is bent in the bending step S130 to fix the bus bar 30 and the electrode tab 12, so that the float 17 is leveled. , Work deformation can be prevented. Further, since the float 17 can be leveled to prevent the workpiece from being deformed, it is possible to suppress deterioration in quality and yield as described above.

  In the ultrasonic bonding method, the end 15 of the electrode tab 12 is bent to fix the bus bar 30 and the electrode tab 12, so that the bus bar 30 and the electrode tab 12 are squeezed from the thickness direction by a hydraulic cylinder or the like, for example, like a mechanical clinch. Compared with the case of joining, the applied force can be reduced. Therefore, a relatively simple configuration such as a pneumatic cylinder is sufficient, and the apparatus can be made compact.

  In the ultrasonic bonding method, immediately after the ultrasonic vibration is stopped, the pressing step S120 presses the float 17 and the bending step S130 bends the end 15 of the electrode tab 12. That is, in the state where the electrode tab 12 is softened by the heat generated by the ultrasonic vibration, the pressing step S120 presses the float 17 and the bending step S130 bends the end portion 15 of the electrode tab 12, so that compared to the case of room temperature, It can be deformed with a smaller force. And since it can deform | transform with smaller force, the load concerning the junction part of the electrode tab 12 and the bus-bar 30 joined by ultrasonic joining is also small, and joining strength and quality are securable.

Second Embodiment
12 and 13, the second embodiment is substantially the same as the first embodiment, but the pressing step S220 and the clamp 252 are different from the first embodiment.

  The clamp 252 includes a rotatable roller 257 in addition to the configuration of the first embodiment. In the second embodiment, the pressing step S220 is performed simultaneously with the joining step S210, and the electrode tab 12 is pressed by the roller 257 when applying ultrasonic vibration as shown in FIGS. When the ultrasonic vibration is applied, the roller 257 rotates in accordance with the vibration of the electrode tab 12 and does not hinder the extension of the electrode tab 12 in the surface direction.

  In the second embodiment, the clamp 252 has a roller 257, and when the pressing step S220 applies ultrasonic vibration, the electrode tab 12 is pressed by the roller 257, so that the float 17 is suppressed and deformation of the work is prevented. it can. In the first embodiment, the float 17 is corrected after it is generated, but in the second embodiment, the occurrence of the float 17 itself is suppressed by the roller 257 to prevent the workpiece from being deformed.

  In the second embodiment, the electrode tab 12 is pressed at the time of ultrasonic bonding to suppress the float 17, so that it is superior in terms of work efficiency compared to the first embodiment in which ultrasonic bonding and pressing of the float 17 are performed separately. . In addition, about the effect by the structure similar to 1st Embodiment, 2nd Embodiment is the same as that of 1st Embodiment.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  For example, referring to FIG. 16 and FIG. 17, the end 15 of the electrode tab 12 is not bent so as to sandwich the end of the bus bar 30 as in the second embodiment, but the electrode tab 12 extended by ultrasonic vibration is not bent. The end 15 may be simply bent at a substantially right angle by the punch 361. Further, as shown in FIG. 18, the end portion 15 of the electrode tab 12 protruding from the end portion of the bus bar 30 may be cut by, for example, ceramic teeth 365. However, it is preferable to bend the end portion 15 of the electrode tab 12 as in the embodiment described above because the electrode tab 12 is firmly fixed to the bus bar 30.

  In the above-described embodiment, the bonding between the electrode tab and the bus bar has been described, but the present invention is not limited to this. That is, the present invention only needs to join different kinds of plate-like members, for example, may join positive electrode tabs and negative electrode tabs of different batteries, or in a field different from batteries. It may be used.

  In the above-described embodiment, the float generated at the end portion of the electrode tab due to the warp is pressed. However, the present invention is not limited to this, and for example, the lift generated by the heel or the like may be pressed. You may press the float which arises in a different place.

10 battery,
12 Electrode tab (second workpiece),
15 End of electrode tab (end of second workpiece),
30 Busbar (first work),
100 ultrasonic bonding equipment,
110, 210, 310 horn,
120, 220, 320 anvil,
130 ultrasonic bonding apparatus body,
140 control unit,
150 pressing part,
151, 251 and 351 (first contact portion),
152, 252, 352 clamp (second contact portion),
153 pneumatic cylinder,
160 bent part,
161, 261, 361 blocks,
162 clamp,
163 pneumatic cylinder,
257, 357 Roller.

Claims (8)

By pressing between a horn and an anvil that give ultrasonic vibrations, sandwiching a plate-like first work and a plate-like second work that is softer than the first work, and applying ultrasonic vibrations An ultrasonic bonding apparatus for bonding the first workpiece and the second workpiece,
After the ultrasonic vibration stops, a pressing portion that presses the floating of the second workpiece,
After the pressing portion presses the float, a bent portion that bends the end portion of the second workpiece protruding from the end portion of the first workpiece so as to sandwich the end portion of the first workpiece. An ultrasonic bonding apparatus.   Immediately after the ultrasonic vibration is stopped, while the horn and the anvil are stationary while pressing the first work and the second work, the pressing part presses the float, and the folding The ultrasonic bonding apparatus according to claim 1, wherein the bent portion bends an end portion of the second workpiece.   The pressing portion has a higher thermal conductivity than the first workpiece, a first abutting portion that abuts on the first workpiece, and a lower thermal conductivity than the second workpiece. A second abutting portion that abuts against the workpiece, and presses the float by sandwiching the first workpiece and the second workpiece by the first abutting portion and the second abutting portion. The ultrasonic bonding apparatus according to claim 1 or 2.   4. The ultrasonic bonding apparatus according to claim 1, wherein an end portion of the second workpiece has a concave shape that is recessed in a vibration direction of the horn in a plan view. By pressing between a horn and an anvil that give ultrasonic vibrations, sandwiching a plate-like first work and a plate-like second work that is softer than the first work, and applying ultrasonic vibrations An ultrasonic bonding apparatus for bonding the first workpiece and the second workpiece,
An ultrasonic bonding apparatus having a rotatable roller for pressing the second workpiece when applying ultrasonic vibration. By pressing between a horn and an anvil that give ultrasonic vibrations, sandwiching a plate-like first work and a plate-like second work that is softer than the first work, and applying ultrasonic vibrations An ultrasonic bonding method for bonding the first workpiece and the second workpiece,
A pressing step for pressing the floating of the second workpiece after the ultrasonic vibration has stopped;
A bending step of bending the end of the second workpiece protruding from the end of the first workpiece so as to sandwich the end of the first workpiece after the pressing step; .   Immediately after the ultrasonic vibration is stopped, while the horn and the anvil are stationary while pressing the first work and the second work, the pressing step presses the float, The ultrasonic bonding method according to claim 6, wherein the bending step bends an end portion of the second workpiece. By pressing between a horn and an anvil that give ultrasonic vibrations, sandwiching a plate-like first work and a plate-like second work that is softer than the first work, and applying ultrasonic vibrations An ultrasonic bonding method for bonding the first workpiece and the second workpiece,
An ultrasonic bonding method comprising a pressing step of pressing the second workpiece with a rotatable roller when applying ultrasonic vibration.

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