JP2014213374A - Joint body manufacturing method, power storage element manufacturing method, and welding control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a joint body by suppressing the occurrence of poor welding by laser welding.SOLUTION: A joint body manufacturing method makes a first member 141 and a second member 142 abut on each other, emits a laser beam 200 in a direction intersecting a boundary line 143, relatively moves forward an irradiation position of the laser beam 200 along the boundary line 143 to weld the first member 141 and the second member 142, thereby manufacturing a joint body. The joint body manufacturing method includes a width direction reciprocating step for relatively reciprocating an irradiation position of the laser beam 200 in a width direction intersecting a traveling direction of the irradiation position of the laser beam 200 and intersecting an optical axis of the laser beam 200, and an optical axis direction reciprocating step for relatively reciprocating a focus position 201 of the laser beam 200 along an optical axis of the laser beam 200.

Description

  The present invention relates to a method of manufacturing a metal joined body or a power storage element by laser welding a metal member to each other, and a program.

  When metal members are welded together with a laser beam, defects (porosity) such as blow holes generated in the welded portion lead to a deterioration in the quality of the welded portion. However, there is a demand for a laser welding method in which blowholes are present in the welded portion and are difficult to detect by visual inspection and the like, and blowholes are less likely to occur.

  Therefore, Patent Document 1 describes a laser welding method in which a plurality of laser beams having different focal positions are synthesized on the same optical axis, and a plurality of laser beams are simultaneously irradiated onto a joint portion. Specifically, a portion near the surface of the metal member is melted by laser light having a focal position near the surface position of the metal member, and at the same time, the focal position is located inside the metal member (so-called defocused state). The inside of the metal member at the same place is melted by the laser beam.

JP 2012-45570 A

  However, in order to superimpose a plurality of laser beams having different focal positions on the same optical axis, a complicated apparatus is required, and control of the apparatus for welding is also complicated.

  The present invention has been made in view of the above problems, and a joined body manufacturing method capable of manufacturing a joined body or the like while suppressing the occurrence of welding defects such as blow holes, despite the use of a single laser beam, An object of the present invention is to provide a storage element manufacturing method and a welding control program.

  In order to achieve the above object, a method for manufacturing a joined body according to the present invention includes contacting a first member and a second member in a direction intersecting a boundary line between the first member and the second member. A joined body manufacturing method for manufacturing a joined body by irradiating a laser beam and welding the first member and the second member by relatively moving the irradiation position of the laser light along the boundary line. A reciprocating motion in the width direction that reciprocally moves the irradiation position of the laser light in a width direction that intersects the traveling direction of the irradiation position of the laser light and intersects the optical axis of the laser light. And a reciprocating step in the optical axis direction in which the focal position of the laser light is relatively reciprocated along the optical axis of the laser light.

  According to this, the first member and the second member in contact state (hereinafter, these may be collectively referred to as “members to be welded”) and the optical axis of the laser beam relatively proceed, The irradiation position of the laser beam is reciprocated and the member to be welded and the optical axis of the laser beam are reciprocated in a direction crossing the traveling direction, that is, the focal position of the laser beam or the irradiation position is three-dimensionally Because the welded member is welded while moving in a moving manner, the focus position of the laser beam or the irradiation position moves three-dimensionally inside the molten pool to create a state where the molten pool is agitated Can do. Accordingly, it is possible to promote the separation of the bubbles generated in the molten pool from the molten pool, and it is possible to suppress the occurrence of defects such as blow holes in the welded portion after the molten pool has solidified. As a result, it is possible to provide a highly reliable bonded body with high bonding strength at the welded portion.

  In addition, the intersecting portion can be melted widely, and the occurrence of poor welding can be suppressed. Therefore, the beam diameter of the laser beam can be reduced, and a deep welding distance can be obtained.

  And a reciprocating step in a traveling direction in which the irradiation position of the laser light is relatively advanced along the boundary line and then the irradiation position of the laser light is relatively retracted along the boundary line. But you can.

  According to this, it is possible to irradiate laser beam again to the molten pool that is solidifying and return it to the molten state again, so that the molten pool can be stirred more effectively, and bubbles are generated in the molten pool, particularly in deep parts. Bubbles can be effectively separated. Therefore, it is possible to effectively avoid the occurrence of blow holes and the like.

  In the reciprocating step in the width direction, the irradiation position of the laser beam is periodically reciprocated in the width direction at a first period, and in the reciprocating step in the optical axis direction, the focal position of the laser beam is changed to light. You may make it reciprocate periodically with the 2nd period synchronized with the said 1st period along the axis | shaft.

  According to this, a uniform or almost uniform molten pool can be formed in the relative traveling direction of the optical axis of the laser beam and the member to be welded, and the quality of welding after the molten pool has solidified is also improved. Can be uniform or nearly uniform in the relative direction of travel.

  In addition, on the opposite side to the laser light irradiation side, a third member extending along the boundary line is disposed so as to straddle the boundary line, and the optical axis of the laser light is in contact with the first member. You may irradiate the said laser beam so that the boundary surface of one member and said 2nd member may be followed.

  According to this, even if the thickness of the contact portion between the first member and the second member is thin and the laser beam passes through the member to be welded, the laser beam transmitted by the third member can be blocked, It is possible to avoid damage to the members and the parts other than the third member existing on the side opposite to the side irradiated with the laser light with respect to the members. Accordingly, it is possible to arbitrarily change the focal position or the irradiation position of the laser light without being greatly affected by the thickness of the contact portion between the first member and the second member.

  In order to achieve the above object, the method for manufacturing an electric storage element according to the present invention makes a first member that is a part of a housing abut a second member that is another part of the housing, By irradiating a laser beam in a direction crossing a boundary line between the first member and the second member, and relatively moving an irradiation position of the laser beam along the boundary line, the first member and the first member A power storage device manufacturing method for manufacturing a power storage device by welding two members, wherein the laser beam crosses the traveling direction of the irradiation position of the laser light, and the width direction is a direction crossing the optical axis of the laser light A reciprocating step in the width direction for relatively reciprocating the irradiation position of the laser light; and a reciprocating step in the optical axis direction for reciprocating the focal position of the laser light along the optical axis of the laser light; It is characterized by including.

  Further, either one of the first member and the second member may be a container body, and the other may be a lid body that seals the container body.

  Further, either one of the first member and the second member may be a housing body having a through hole that is a part of the housing, and the other may be a safety valve that seals the through hole. Good.

  According to the above, while the member to be welded and the optical axis of the laser beam are relatively advanced, the focal position of the laser beam is reciprocated and the member to be welded and the laser beam are crossed in the direction intersecting the traveling direction. Since the member to be welded is welded while reciprocating the optical axis, that is, the focal position of the laser beam or the irradiation position is moved three-dimensionally, the focal position of the laser beam inside the molten pool, Alternatively, it is possible to create a state where the irradiation position moves three-dimensionally and stirs the molten pool. Accordingly, bubbles generated in the molten pool rise before the molten pool solidifies and are easily separated from the molten pool, and it is possible to suppress the occurrence of defects such as blow holes in the welded portion after the molten pool has solidified. . As a result, it is possible to provide a highly reliable power storage element with high weld strength at the welded portion.

  Moreover, in order to achieve the said objective, the welding control program which concerns on this invention makes the 1st member and the 2nd member contact | abut, and the direction which cross | intersects the boundary line of said 1st member and said 2nd member A welding control program for controlling a welding apparatus for welding the first member and the second member by irradiating a laser beam to the laser beam and relatively moving the irradiation position of the laser beam along the boundary line. A reciprocating step in a width direction that crosses a traveling direction of the irradiation position of the laser light and relatively reciprocates the irradiation position of the laser light in a width direction that is a direction intersecting an optical axis of the laser light; Controlling the welding apparatus using a computer so as to execute an optical axis reciprocating step of reciprocating the focal position of the laser light relatively along the optical axis of the laser light. And features.

  According to this, the first member and the second member in contact state (hereinafter, these may be collectively referred to as “members to be welded”) and the optical axis of the laser beam relatively proceed, The focal position of the laser beam is reciprocated and the member to be welded and the optical axis of the laser beam are reciprocated in a direction crossing the traveling direction, that is, the focal position of the laser beam or the irradiation position is three-dimensionally. Since the member to be welded is welded while being moved in a moving manner, it is possible to create a state in which the focal position of the laser beam or the irradiation position moves inside the molten pool and the molten pool is agitated. Accordingly, bubbles generated in the molten pool rise before the molten pool solidifies and are easily separated from the molten pool, and it is possible to suppress the occurrence of defects such as blow holes in the welded portion after the molten pool has solidified. . As a result, it is possible to provide a highly reliable bonded body with high bonding strength at the welded portion.

  According to the present invention, it is possible to manufacture a bonded body with a high reliability of a bonded portion by suppressing the occurrence of poor welding such as a blow hole with only one laser beam.

FIG. 1 is a diagram schematically showing a welding apparatus for manufacturing a joined body by welding using a laser beam. FIG. 2 is a block diagram showing the functional unit of the control device together with the mechanism unit. FIG. 3 is a perspective view showing an external appearance of a power storage element having a housing as a joined body. FIG. 4 is a diagram schematically showing the movement locus of the irradiation position on the XY plane. FIG. 5 is a diagram schematically showing the movement locus of the focal position in the YZ plane. FIG. 6 is a diagram schematically illustrating the movement locus of the irradiation position on the XY plane according to another embodiment. FIG. 7 is a diagram schematically illustrating the movement locus of the irradiation position on the XY plane according to another embodiment. FIG. 8 is a diagram schematically showing the movement locus of the focal position on the YZ plane according to another embodiment. FIG. 9 is a diagram schematically illustrating another embodiment of a welding apparatus for manufacturing a joined body by welding using a laser beam.

  Next, embodiments of a joined body manufacturing method, a storage element manufacturing method, and a welding control program according to the present invention will be described with reference to the drawings. The following embodiments are merely examples of a joined body manufacturing method, a storage element manufacturing method, and a welding control program according to the present invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.

  FIG. 1 is a diagram schematically showing a welding apparatus for manufacturing a joined body by welding using a laser beam.

  As shown in the figure, a welding device 100 is a device for welding a member to be welded 104 (a metal first member 141 and a metal second member 142 using a laser beam 200, an oscillator 101, a scan, and the like. A device 102 and a control device 103 are provided.

  The oscillator 101 is a device that emits the laser light 200 and is a device that includes optical devices such as a light source of the laser light 200 and a beam expander. The type of laser beam 200 to be oscillated is not particularly limited, and examples thereof include a YAG laser and an excimer laser. In the case of the present embodiment, the laser beam 200 emitted from the oscillator 101 is introduced into the scanning device 102 by the optical fiber 144.

  The scanning device 102 is a device that can relatively scan (sweep) the focus position 201 (or irradiation position) of the laser light 200 and the member 104 to be welded in three dimensions. In the case of the present embodiment, the scanning device 102 is a device that moves the focal position 201 (or irradiation position) of the laser beam 200 with respect to the member 104 to be welded in a fixed state, and separately provides two galvanometer mirrors. A galvano scanner capable of freely moving the irradiation position on the surface (welded surface) of the member to be welded 104 or a surface parallel to the surface (XY plane in the figure) by being driven, and the member to be welded This is a device combined with a lens that moves the focal position 201 in the optical axis direction (Z-axis direction in the figure) of the laser light 200 irradiated on the surface of 104. Here, the optical axis direction of the laser beam 200 means the optical axis in the vicinity of the member to be welded 104 of the laser beam 200 irradiated to the member to be welded 104. In the case of the present embodiment, the scanning device 102 is used. This coincides with the optical axis of the laser beam 200 emitted from the laser beam.

  Here, the focal position means a position set by the scanning device 102, and since the laser beam 200 does not enter the welded member 104, the focal point is virtually focused even when the focal point is not actually formed. Position 201 exists.

  The scanning device 102 is not particularly limited. For example, a combination of a galvano scanner and a device that reciprocates the welded member 104 in the optical axis direction (Z-axis direction) of the laser beam 200 may be used. Further, a laser head connected to the oscillator 101 and emitting laser light may be attached to the robot arm and the laser head itself may be moved three-dimensionally.

  The control device 103 is a computer that controls the oscillator 101 and the scanning device 102. In the case of the present embodiment, the control device 103 individually controls the driving of the two galvanometer mirrors provided in the scanning device 102 and sets the focal position 201 (or irradiation position) in the optical axis direction of the laser light 200 ( The driving of the lens to be moved in the Z-axis direction) is controlled.

  FIG. 2 is a block diagram showing the functional unit of the control device together with the mechanism unit.

  As shown in the figure, the control device 103 according to the present embodiment controls each mechanism unit by causing a computer to execute software, and as a processing unit realized by software, width direction reciprocation control is performed. Unit 131, traveling direction reciprocation control unit 132, optical axis direction reciprocation control unit 133, and oscillator control unit 134.

  The width direction reciprocation controller 131 intersects the traveling direction (Y direction in the drawing) of the optical axis of the laser beam 200 and the width direction (the direction intersecting the optical axis (Z axis direction in the drawing) of the laser beam 200 ( This is a processing unit that controls the X-axis galvanometer mirror 121 so that the focal position 201 (or irradiation position) of the laser beam 200 reciprocates relative to the member to be welded 104 in the X-axis direction in the drawing.

  The optical axis reciprocation control unit 133 reciprocates relative to the member to be welded 104 along the optical axis (Z-axis direction in the drawing) of the laser beam 200 at the focal position 201 (or irradiation position) of the laser beam 200. A processing unit that controls the lens 123 to move.

  The traveling direction reciprocation controller 132 relatively moves the laser beam 200 after the focal position 201 (or irradiation position) of the laser beam 200 travels along the boundary line 143 (a contact portion extending in the Y-axis direction in the drawing). This is a processing unit that controls the Y-axis galvanometer mirror 122 so that 200 focal positions 201 (or irradiation positions) are relatively retracted along the boundary line 143.

  Here, the boundary line 143 is a contact portion between the first member 141 and the second member 142, and is a linear portion that appears on the surface of the member to be welded 104.

  The oscillator control unit 134 is a processing unit that controls whether or not the laser beam 200 is emitted and also controls the output of the emitted laser beam.

  Next, the joined body manufacturing method will be described.

  FIG. 3 is a perspective view showing an external appearance of a power storage element having a housing as a joined body.

  In the case of the present embodiment, the power storage element 300 having the housing 301 as a joined body is an element that can store and discharge, and is, for example, a secondary battery such as a lithium ion battery or a capacitor. The housing 301 is a member made of a metal material such as aluminum or stainless steel, and is a member that forms a sealed space. The housing 301 is formed of a container body 311 that houses a power generation element and a lid body 312 that seals the container body 311. From another point of view, the housing 301 is formed of a housing body 313 having a through-hole that houses the power generation element in a sealed state, and a safety valve 314 that blocks the through-hole.

  In order to manufacture the storage element 300 by forming the housing 301 as a joined body, the lid 312 having a through hole and the safety valve 314 are welded, and the lid 312 to which a power generation element, a current collector, and the like are attached. After being inserted into the container body 311, the container body 311 and the lid body 312 are joined by welding. Alternatively, the container body 311 having a through hole and the safety valve 314 are welded, and the lid body 312 to which a power generation element or a current collector is attached is inserted into the container body 311 to which the safety valve is attached. The body 312 is joined by welding.

  As a specific welding method, welding of the container body 311 and the lid body 312 will be described as an example. First, the container body 311 (first member) and the lid body 312 (second member) which are a part of the housing 301 as a joined body are brought into contact with each other. In the case of the present embodiment, the container body 311 and the lid body 312 are brought into contact with each other by fitting the lid body 312 into the opening of the container body 311. Further, as shown in FIG. 1, a protrusion 145 that protrudes inward of the container body 311 is provided in the vicinity of the opening of the container body 311, and the lid body 312 is formed inward of the container body 311. It has become something that does not fall into. Further, the protruding portion 145 also functions as a third member extending along the boundary line 143 so as to straddle the boundary line 143 on the side opposite to the side irradiated with the laser light 200. Even when the laser beam 200 is irradiated and welded so that the axis is along the boundary surface including the boundary line 143, the laser beam 200 can be prevented from entering the inside of the housing 301.

  Next, the laser beam 200 is irradiated in a direction intersecting the boundary line 143 (Z-axis direction in the drawing), and the focal position 201 (or irradiation position) of the laser beam 200 is set along the boundary line 143 to the welded member 104 ( Proceeding relative to the container body 311 and the lid body 312. In the case of the present embodiment, the boundary line 143 draws a rectangle (rectangle) with all corners R arranged in the XY plane. Therefore, the traveling direction is the X-axis direction and the Y-axis direction Note that since the boundary line 143 between the lid 312 and the safety valve 314 is circular, the traveling direction is a circular tangent.

  At the same time as the progress of the focal position 201 (or irradiation position), as shown in FIG. 4, it intersects the traveling direction (Y-axis direction in the figure) of the focal position 201 (or irradiation position) of the laser beam 200, The focal position 201 (or irradiation position) of the laser beam 200 is relatively reciprocated in the width direction (X-axis direction in the drawing) that intersects the optical axis of the laser beam (Z-axis direction in the drawing) (width). Direction reciprocating step). In the case of this embodiment, it is reciprocated in the first direction in the width direction. Thus, by combining the progress of the focal position 201 (or irradiation position) and the reciprocating motion in the width direction, the focal position 201 (or irradiation position) moves in a zigzag manner on the XY plane. The reciprocation of the focal position 201 (or irradiation position) may be smoothly moved like a sine curve.

  Further, as shown in FIG. 5, at the same time as the progress of the focal position 201 (or irradiation position) and at the same time as the reciprocating movement of the focal position 201 (or irradiation position) in the width direction, The focal position 201 is relatively reciprocated along the optical axis (Z-axis direction in the drawing) of the laser beam 200 (optical axis reciprocation step). In the case of the present embodiment, the focal position 201 is set so as to reciprocate across the boundary line 143 from a position away from the surface of the member to be welded 104 to a position to enter the member to be welded 104. . Further, while the focal position 201 (or irradiation position) is reciprocated once in the width direction, it is reciprocated once along the optical axis. That is, the first period, which is the reciprocating period of the focal position 201 (or irradiation position) in the width direction, is synchronized with the second period, which is the reciprocating period of the focal position 201 in the optical axis direction (this embodiment). In the case of the form, they are synchronized one to one).

  By adopting the welding method as described above, in the state where the focal position 201 of the laser beam 200 is arranged in the vicinity of the surface position of the member to be welded 104, the portion near the surface of the member to be welded 104 is heated. Melt. In this case, the member to be welded 104 is irradiated with the laser beam 200 having a high energy density, so that the member to be welded 104 can be easily melted. Next, the focal position 201 gradually enters the material. As a result, the inside of the member to be welded 104 is heated and melted, and the laser beam 200 in the defocused state melts the member to be welded 104 around the focal position 201, so that the molten pool becomes large. Also, when the focal position 201 gradually moves away from the member to be welded 104, the laser beam 200 in the defocused state heats the molten pool and delays solidification. Furthermore, since the focal position 201 (or irradiation position) reciprocates in the width direction in addition to the reciprocal movement in the optical axis direction, a large molten pool can be formed even when the beam diameter of the laser light 200 is thin. . In this way, the molten pool expands not only in the traveling direction of the focal position 201 (or irradiation position) but also in the width direction, and as a result of maintaining the molten state for a long time, bubbles generated inside the molten pool are melted. It becomes easy to detach before the pond solidifies. Therefore, it becomes possible to suppress generation | occurrence | production of defects, such as a blow hole and a porosity, in a welding part.

  Further, by reciprocating the focal position 201 (or irradiation position) in the width direction across the boundary line 143, a wide molten pool can be formed, so that the intersecting portion can be melted widely, Component tolerances can be absorbed and the occurrence of poor welding can be suppressed. Further, the beam diameter of the laser beam 200 can be reduced, and a deep welding distance can be obtained.

  Furthermore, even if fitting displacement occurs in the member to be welded 104, welding can be performed while allowing fitting displacement by reciprocating the focus position 201 and the irradiation position.

  The casing 301 as a joined body manufactured by the above welding method is free from defects in the welded portion between the container body 311 and the lid body 312 and the welded portion between the housing body 313 and the safety valve 314, and has a mechanical strength. It becomes a highly reliable member. Therefore, the power storage element 300 including the housing 301 is also a highly reliable power storage element.

  In addition, the said embodiment has illustrated the manufacturing method of a conjugate | zygote, and the 1st member 141 and the 2nd member 142 which are the to-be-welded members 104 are not limited. Accordingly, the first member 141 and the second member 142 may be anything as long as they can be laser welded, and either the first member 141 or the second member 142 is the container body 311. The other may be a lid 312 that seals the container 311. One of the first member 141 and the second member 142 is a housing body 313 having a through hole that is a part of the housing 301, and the other is a safety valve 314 that blocks the through hole. May be.

  Next, a joined body manufacturing method according to another embodiment will be described.

  FIG. 6 is a diagram schematically showing the movement locus of the focal position (or irradiation position) on the XY plane.

  As shown in the figure, the focal position 201 (or irradiation position) of the laser beam 200 is relatively advanced along the boundary line 143, and then the focal position 201 (or irradiation position) is moved along the boundary line 143. Reciprocal reciprocation is repeatedly performed (reciprocating step in the advancing direction), and as a whole, the advancing is made in a certain direction.

  Further, at the same time as the focal position 201 (or irradiation position) advances, the focal position 201 (or irradiation position) of the laser beam 200 is reciprocated in the width direction (X-axis direction in the figure) (reciprocation in the width direction). Step). By synchronizing the period of the reciprocating step in the traveling direction and the period of the reciprocating step in the width direction, a movement locus of the focal position 201 (or irradiation position) as shown in FIG. 6 can be drawn. Further, by combining the reciprocating step in the traveling direction and the reciprocating step in the width direction with the reciprocating step in the optical axis direction, while repeating the advance and retreat of the focal position 201 (or irradiation position) along the boundary line 143, The focal position 201 (or irradiation position) is reciprocated in the width direction, and is also reciprocated in the optical axis direction. Therefore, the molten pool can be maintained in a molten state for a longer time, and bubbles generated in the molten pool can be easily separated. Therefore, it is possible to further suppress the occurrence of defects such as blow holes and porosity in the welded portion.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  Further, for example, the locus of the focal position (or irradiation position) 201 drawn on the XY plane by the traveling direction reciprocating step or the width direction reciprocating step is limited to that shown in FIGS. is not. For example, a trajectory as shown in FIG. 7 may be used.

  Further, the locus of the focal position 201 drawn by the optical axis direction reciprocating step is not limited to the zigzag as shown in FIG. 5 and straddling the boundary line 143. For example, a locus such as a sine curve as shown in FIG. 8 may be used, or the focal position 201 may be located inside the welded member 104 without crossing the boundary line 143.

  Further, as in the above embodiment, the container body 311 is provided with the protrusion 145 (notch), the lid body 312 is placed thereon, and the laser beam 200 is irradiated from the upper surface of the lid body 312. As shown in FIG. 9, a protrusion 145 (notch) is provided on the lid 312, the lid 312 is placed on the container 311, and the laser is viewed from the lateral direction of the casing 301 (X-axis direction in the figure). The positional relationship between the irradiation direction of the laser beam 200 and the first member 141 and the second member 142, such as those that irradiate the light 200, may be arbitrary.

  However, when the cover 312 is provided with a protruding portion 145 (notch), and the lid 312 is placed on the container 311 and welded, the container 311 is so thin that it is difficult to provide the notch. However, the dimensional accuracy of the electricity storage element 300 (battery) can be improved.

  Further, when the period in which the laser beam 200 is reciprocated along the boundary line 143 is the third period, the first period and the third period may be synchronized, or the second period and the third period may be synchronized. The first cycle, the second cycle, and the third cycle may be synchronized.

  INDUSTRIAL APPLICABILITY The present invention can be used for manufacturing a joined body obtained by welding a plurality of metal members with a laser beam, particularly for manufacturing a storage element.

DESCRIPTION OF SYMBOLS 100 Welding apparatus 101 Oscillator 102 Scanning apparatus 103 Control apparatus 104 To-be-welded member 121 Axis galvano mirror 122 Axis galvano mirror 123 Lens 131 Width direction reciprocation control part 132 Travel direction reciprocation control part 133 Optical axis direction reciprocation control part 134 Oscillator control Part 141 First member 142 Second member 143 Boundary line 144 Optical fiber 145 Protrusion 200 Laser light 201 Focus position (or irradiation position)
300 power storage element 301 housing 311 container body 312 lid body 313 housing body 314 safety valve

Claims (8)

The first member and the second member are brought into contact with each other, the laser beam is irradiated in a direction intersecting with the boundary line between the first member and the second member, and the irradiation position of the laser beam along the boundary line Welding the first member and the second member by relatively proceeding to produce a joined body,
A width direction reciprocating step that reciprocally moves the irradiation position of the laser light in a width direction that intersects a traveling direction of the irradiation position of the laser light and intersects an optical axis of the laser light;
An optical axis reciprocating step of relatively reciprocating the focal position of the laser light along the optical axis of the laser light. further,
The traveling direction reciprocating step of relatively moving the irradiation position of the laser light along the boundary line after relatively moving the irradiation position of the laser light along the boundary line. 2. A method for producing a joined body according to 1. In the reciprocating step in the width direction, the irradiation position of the laser light is reciprocated periodically in the width direction in a first cycle,
The joined body according to claim 1 or 2, wherein, in the optical axis direction reciprocating step, the focal position of the laser light is periodically reciprocated in a second period synchronized with the first period along the optical axis. Production method. On the side opposite to the side irradiated with the laser light, a third member extending along the boundary line so as to straddle the boundary line is disposed,
The joined body manufacturing according to any one of claims 1 to 3, wherein the laser light is irradiated so that an optical axis of the laser light is along a boundary surface between the first member and the second member in a contact state. Method. A first member that is a part of the housing and a second member that is another part of the housing are brought into contact with each other, and laser light is emitted in a direction intersecting a boundary line between the first member and the second member. , And welding the first member and the second member by relatively advancing the irradiation position of the laser light along the boundary line, a power storage device manufacturing method for manufacturing a power storage device,
A width direction reciprocating step that reciprocally moves the irradiation position of the laser light in a width direction that intersects a traveling direction of the irradiation position of the laser light and intersects an optical axis of the laser light;
And a reciprocating step in the optical axis direction in which the focal position of the laser light is relatively reciprocated along the optical axis of the laser light. 6. The method for manufacturing a storage element according to claim 5, wherein one of the first member and the second member is a container body, and the other is a lid body that seals the container body. 6. Either one of said 1st member and said 2nd member is a housing | casing main body which has a through-hole which is a part of housing | casing, and the other is a safety valve which blocks the said through-hole. The electrical storage element manufacturing method of description. The first member and the second member are brought into contact with each other, the laser beam is irradiated in a direction intersecting the boundary line between the first member and the second member, and the irradiation position of the laser beam is set along the boundary line A welding control program for controlling a welding apparatus for welding the first member and the second member by relatively moving,
A width direction reciprocating step that reciprocally moves the irradiation position of the laser light in a width direction that intersects a traveling direction of the irradiation position of the laser light and intersects an optical axis of the laser light;
The welding control program which controls the said welding apparatus using a computer so that the optical axis direction reciprocation step which reciprocates relatively the said focus position of the said laser beam along the optical axis of the said laser beam may be performed.

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