JP2013235730A - Method of manufacturing exterior body for power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exterior body for a storage element capable of suppressing the occurrence of welding failure when laser welding a body part capable of enclosing an electrode body and a closed part closing an opening part of the body part. A manufacturing method is provided.
A manufacturing method according to the present invention includes a body portion having an opening, an annular body portion that can surround an electrode body, and a closing portion that closes the opening portion. In the body manufacturing method, the step of disposing the closing portion on the opening end of the trunk portion so that the end portion of the closing portion protrudes outward from the outer periphery of the trunk portion, the outer periphery of the trunk portion, and the trunk Laser welding the end portion of the closed portion protruding from the outer periphery of the portion.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing an exterior body for an electricity storage element that houses an electrode body.

  2. Description of the Related Art Conventionally, an electric storage element that is used as a power source for various devices has been provided with an electrode body including a positive electrode and a negative electrode, and a metal exterior body that houses the electrode body.

  An exterior body of this type of power storage element is an annular body portion that surrounds an electrode body, and includes a body portion having openings at both ends, and a pair of closing portions that close the openings at both ends of the body portion. . And in this kind of exterior body, at least any one of the pair of closed portions is welded to the body portion, so that at least one of the opening portions of the body portion is sealed. There are some (see, for example, Patent Document 1).

  This will be described more specifically. The exterior body includes a trunk portion having an opening, and a closed portion formed corresponding to the outer shape and size of the trunk portion, and formed by a closed portion configured separately from the trunk portion. is there. In such an exterior body, the opening part of the trunk part is hermetically sealed by welding the outer periphery of the closing part and the outer periphery of the trunk part, which are superimposed on the opening end of the trunk part.

  Further, some exterior bodies are formed by processing a development plate punched into a shape in which a body part and a closed part are developed. That is, the exterior body includes a first region set in accordance with the shape of the closed portion after completion and at least one second region set in shape corresponding to the developed shape of the body portion after completion. Some are formed by a deployment plate having at least one second region connected to the outer edge of the first region.

  In this type of exterior body, the space between the trunk portion and the closed portion is sealed by welding the portion in a non-connected state after making the development plate a three-dimensional shape.

  Specifically, in forming the exterior body from the development plate, the boundary between the first region and the second region in the development plate is bent, and the second region is brought upright with respect to the first region.

  When there is only one second region, the second region is bent according to the outer shape of the first region, and both ends in the circumferential direction of the second region are butt welded. On the other hand, when there are two or more second regions, each of the second regions is bent according to the outer shape (outer edge) of the first region, and the adjacent second regions are butt welded. As a result, the second region is continuously made into an annular shape conforming to the outer shape of the first region and becomes a trunk portion, and the first region becomes a closed portion overlapping the opening of the trunk portion.

  And in any of the above cases, it is a part on the boundary between the trunk part and the blocking part, except for the bent part (the part corresponding to the connecting part between the first region and the second region in the development plate). At the site, the trunk portion is in a state of being not connected to the closed portion and overlapping the end portion of the closed portion.

  Accordingly, in this type of exterior body, the outer periphery of the trunk located on the end of the closed part and the outer periphery of the closed part are welded, so that the opening of the trunk is sealed.

JP 2011-210464 A

  By the way, electrolyte solution is put in the exterior body of the electricity storage element. Moreover, gas is generated in the exterior body with charge and discharge. Therefore, the exterior body is required to be liquid-tight and air-tight. Along with this, the body portion and the closed portion are welded by deep penetration type laser welding (keyhole type laser welding) that can increase the mutual penetration amount.

  However, if the barrel portion and the closed portion are welded by deep penetration laser welding, the barrel portion and the closed portion may melt away, and liquid tightness and air tightness may not be ensured. In other words, deep penetration type laser welding creates a weld pool while creating a keyhole at the welding site by laser beam irradiation, so that the close contact between the trunk and the closed portion, the irradiation position or irradiation direction of the laser beam, The melting part of the trunk and the closed part may fall off. Therefore, the liquid tightness and air tightness between the trunk and the closed part may not be ensured. In particular, when the welding start positions of the trunk portion and the closing portion are set on the welding line, the melting of the barrel portion and the closing portion becomes remarkable.

  Therefore, in view of such a situation, the present invention provides a power storage that can suppress the occurrence of poor welding in laser welding of a body portion that can surround an electrode body and a closed portion that closes an opening portion of the body portion. It is an object of the present invention to provide a method for manufacturing an exterior body for an element.

  The present invention relates to a body part having an opening, wherein the body part includes an annular body part that can surround the electrode body, and a closing part that closes the opening part. A step of disposing the closing part on the opening end of the body part so that the end part of the body part protrudes outward from the outer periphery of the body part, the outer periphery of the body part, and the blocking that protrudes from the outer periphery of the body part And laser welding the end of the part.

  According to the above method, in the laser welding step, the end portion of the closed portion is melted together with the outer periphery of the trunk portion. Along with this, even if a part of the body part and the closed part is melted by laser welding, the end part of the melted closed part flows into the melted part (missed part) and fills that part. Thereby, a trunk | drum and a closure part melt | dissolve and the liquid-tightness and airtightness between a trunk | drum and a closure part are ensured.

  As one aspect of the present invention, the method further includes the step of manufacturing the body, and the step of manufacturing the body includes a step of bending a development plate having a region to be the body, and the development that has been bent. Butt welding the region to be the body portion of the plate and forming a welding line extending in a direction crossing the blocking portion, and in the laser welding step, the welding line is set at a welding start position. Can be.

  In this way, when manufacturing the exterior body, there are less restrictions on the shape and dimensions, and thus it is possible to appropriately manufacture the exterior body in the required form. Further, since an expensive mold is not required in the step of manufacturing the body portion, the cost can be reduced. Further, in the laser welding step, the welding line is set at the welding start position, so that the welding mark formed at the start of laser welding overlaps with the welding line and becomes inconspicuous. Line) is improved in appearance.

  As another aspect of the present invention, the method further includes the step of manufacturing the body, and the step of manufacturing the body includes a step of bending a development plate having a region to be the body, and the development that has been bent. Butt welding a region of the plate that becomes the body portion and forming a welding line extending in a direction intersecting the blocking portion, and in the laser welding step, passing through an end portion of the welding line. The outer periphery of the body portion and the end portion of the closing portion may be laser-welded.

  If it does in this way, with respect to the welding trace of the welding line formed near the closure part by producing the trunk part (butt-welding the region which becomes the trunk part), the outer periphery of the trunk part and the end part of the closure part The welding lines formed by laser welding are overlapped. Therefore, since the welding trace of the welding line near the closed portion is erased by the welding line formed by laser welding, the appearance is improved.

  In these cases, the development plate is an area that is continuous with the area that becomes the body part, and has an area that becomes the closing part, and in the bending step, the area that becomes the body part in the development plate. In the step of bending the boundary between the region to be the closed portion and the region to be the closed portion, bending the region to be the barrel portion into an annular shape, and forming a weld line, the region to be the annular trunk portion is matched. It is preferable to weld.

  In this way, since the region that becomes the body portion and the region that becomes the blocking portion in the development plate are continuous, when the step of bending is completed, the region that becomes the body portion and the region that becomes the blocking portion are partially In this state, the arrangement can be shifted to a step of forming a welding line (welding step) and a step of laser welding. Therefore, in the step of forming the welding line (the step of welding) and the step of laser welding, the relative positioning of the body portion and the closing portion becomes unnecessary, and the workability is improved.

  As another aspect of the present invention, in the step of disposing the closing portion on the opening end portion of the body portion, the amount of protrusion of the end portion of the closing portion protruding from the outer periphery of the body portion is 1 of the thickness of the closing portion. / 4 to 1/3.

  In this way, in the laser welding step, the whole or substantially the entire end portion of the closing portion is melted, and the end portion of the closing portion does not remain after protruding from the outer periphery of the trunk portion, so that the exterior body is formatted. Can be well formed.

  As described above, according to the present invention, it is possible to suppress the occurrence of welding defects when laser welding a body portion that can surround an electrode body and a closed portion that closes an opening portion of the body portion. The effects can be achieved.

FIG. 1 is an overall perspective view of an electricity storage device including an exterior body manufactured by a method for manufacturing an exterior body for an electrical storage element according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II of FIG. 3 is a cross-sectional view taken along the line II-II in FIG. FIG. 4 is a plan view of a development plate for producing a body portion of the exterior body and one closed portion. FIG. 5 is a plan view of a lid plate which is the other closing portion. FIGS. 6A and 6B are partially enlarged views of a state in which the development plate is bent (state before welding), FIG. 6A is a partially enlarged front view, and FIG. 6B is a partially enlarged side view. FIG. 7 is a partially enlarged view of a state (pre-welding state) in which the other closed portion (lid plate) is disposed on the body portion, FIG. 7A is a partially enlarged front view, and FIG. It is an enlarged side view.

  Hereinafter, a method for manufacturing an exterior body for a power storage element according to an embodiment of the present invention (hereinafter simply referred to as a manufacturing method) will be described with reference to the accompanying drawings. First, prior to the description of the manufacturing method, the electrical storage element will be outlined.

  As shown in FIGS. 1 to 3, the power storage device 1 includes an electrode body 10 including a positive electrode and a negative electrode, an exterior body 11 that houses the electrode body 10, and an external terminal 12 that is disposed on the outer surface of the exterior body 11. Prepare.

  And the exterior body 11 is the trunk | drum 13 which has an opening part, Comprising: The cyclic | annular trunk | drum 13 which can surround the electrode body 10, and the obstruction | occlusion parts 14 and 15 which close the opening part of the trunk | drum 13 are provided.

  The trunk | drum 13 has an opening part in both ends. That is, the trunk | drum 13 demarcates the internal space penetrated over the full length. In this embodiment, the trunk | drum 13 is formed in a square ring shape.

  More specifically, the body 13 includes a pair of first walls 130 and 130 that are spaced apart from each other in a first direction (X-axis direction shown in the figure), and a second that is orthogonal to the first direction. A pair of second walls 131 and 131 that are spaced apart from each other in a direction (Y-axis direction shown in the figure), and a pair of second walls 131 that are opposed to each other between the pair of first walls 130 and 130. 131.

  Both ends of the pair of first walls 130, 130 in the second direction are connected to edges of the adjacent second walls 131, 131 in the first direction. And the connection part of the 1st walls 130 and 130 and the 2nd walls 131 and 131 is formed with roundness. That is, the boundary region between the first wall 130, 130 and the second wall 131, 131 is centered on an imaginary line extending in a third direction (Z-axis direction shown in the figure) orthogonal to the first direction and the second direction. Thus, the cross section is formed in an arc shape.

  Each of the pair of first walls 130 and 130 and the pair of second walls 131 and 131 has a first end and a second end in the third direction. One opening is defined by the first end of the pair of first walls 130 and 130 and the first end of the pair of second walls 131 and 131, and the second end and the pair of the pair of first walls 130 and 130 are defined. The other end is defined by the second ends of the second walls 131, 131. That is, the trunk | drum 13 (1st wall 130, 2nd wall 131) forms the square-shaped opening part in the both ends of a 3rd direction.

  In this embodiment, the trunk | drum 13 is flat. Specifically, the dimension (outer dimension) in the first direction of the body part 13 is set longer than the dimension (outer dimension) in the second direction of the body part 13. That is, in the present embodiment, the length of the first wall 130 in the second direction is set shorter than the length of the second wall 131 in the first direction.

  And as the trunk | drum 13 has an opening part in both ends, the closing parts 14 and 15 are provided in a pair corresponding to the opening part of the trunk | drum 13. As shown in FIG. One closing part (hereinafter referred to as a first closing part) 14 of the pair of closing parts 14 and 15 seals one opening part of the body part 13.

  In the present embodiment, the first closing portion 14 is formed in a substantially square shape corresponding to the opening of the body portion 13. Thus, the first closing portion 14 has a first end in the first direction and a second end opposite to the first end, and a fourth end opposite to the third end in the second direction.

  And as the trunk | drum 13 is formed in flat shape, the length of the 1st obstruction | occlusion part 14 in a 1st direction is set longer than the length of a 2nd direction. As described above, as the connecting portion between the first wall 130 and the second wall 131 is formed with a rounded shape, the four corners of the first closing portion 14 are connected to the first wall 130 and the second wall 131. It is formed with roundness corresponding to the connecting portion.

  And the 1st end of the 1st closure part 14 is connected to the 1st end of one 1st wall 130 over the full length, and the 2nd end of the 1st closure part 14 is the other 1st over the full length. The first end of the wall 130 is connected. The third end of the first closing portion 14 is connected to the first end of one second wall 131 over the entire length, and the fourth end of the first closing portion 15 is connected to the other second end over the entire length. Connected to the first end of the wall 131. Thereby, the trunk | drum 13 and the 1st obstruction | occlusion part 14 comprise the bottomed cylindrical container. That is, the 1st obstruction | occlusion part 14 comprises the bottom part of the container. In the present embodiment, the connecting portion between the first closing portion 14 and the second wall 131 is also formed with a round shape (formed in a circular arc shape). That is, the boundary region between the first closing portion 14 and the second wall 131 is formed in a circular arc shape with a virtual line extending in the first direction as the center.

  The other closed portion (hereinafter referred to as a second closed portion) 15 of the pair of first closed portions 14 and 15 seals the other opening of the body portion 13.

  In the present embodiment, the second closing portion 15 is formed in a substantially square shape corresponding to the opening portion of the body portion 13. Thus, the second closing portion 15 has a first end in the first direction and a second end opposite to the first end, and a fourth end opposite to the third end in the second direction.

  And as the trunk | drum 13 is formed in flat shape, the length of the 2nd obstruction | occlusion part 15 in a 1st direction is set longer than the length of a 2nd direction. As described above, as the connecting portion between the first wall 130 and the second wall 131 is formed with a rounded shape, the four corners of the second closing portion 15 are connected to the first wall 130 and the second wall 131. It is formed with roundness corresponding to the connecting portion.

  The second closing portion 15 is disposed on the opening end of the trunk portion 13 after the electrode body 10 is put in the trunk portion 13 (a container constituted by the trunk portion 13 and the first closing portion 14). In addition, it is connected to the body 13 over the entire circumference. That is, the first end of the second closing portion 15 is connected to the second end of one first wall 130 over the entire length, and the second end of the second closing portion 15 is connected to the other first end over the entire length. Connected to the second end of the wall 130. The third end of the second closing portion 15 is connected to the second end of one second wall 131 over the entire length, and the fourth end of the second closing portion 15 is connected to the other second end over the entire length. The second end of the wall 131 is connected.

  Therefore, in the exterior body 11 according to the present embodiment, the body portion 13 and the first closing portion 14 constitute a container, and the second closing portion 15 constitutes a lid portion that closes the opening of the container. In the present embodiment, the external terminal 12 is disposed on the outer surface of the second closing portion 15 and is electrically connected to the electrode body 10 in the exterior body 11.

  The exterior body 11 having the above-described configuration is produced by the deployment plate 2 (see FIG. 4) in which the first closing portion 14 and the body portion 13 are deployed, and the lid plate 3 (see FIG. 5) constituting the second closing portion 15. Is done.

  The development plate 2 is a punched metal plate, and as shown in FIG. 21). This will be described more specifically. In the present embodiment, the development plate 2 has a first region 20 having a rectangular shape in plan view having a first end and a second end in the first direction, and a third end and a fourth end in the second direction, A pair of second regions 21 and 21 connected to the third end and the fourth end of one region 20 are provided.

  The first region 20 is formed corresponding to the shape of the first closed portion (bottom portion) 14 after completion. Therefore, in the present embodiment, the length of the first region 20 in the first direction is set longer than the length of the first region 20 in the second direction.

  And in this embodiment, the trunk | drum 13 of the intermediate | middle stage formed by processing the expansion | deployment plate 2 (The trunk | drum 13 in the state of which both ends were open | released), and the trunk | drum 13 after completion (in the state where the opening part was closed) The length La1 of the first region 20 in the first direction is based on the assumption that the dimensions of the body portion 13) in the first direction and the second direction are the same. Part 14) is set to a length obtained by adding a predetermined length 2α to the dimension Lb1 in the first direction. In other words, the first region 20 (first closed portion 14 before completion) has a predetermined extension amount α from each of the outer surfaces (the outer surfaces of the pair of first walls 130, 130) on both sides of the body portion 13 in the first direction. The length La1 of the first region 20 in the first direction so as to protrude outside is obtained by adding a length 2α that is twice the predetermined extension amount α to the dimension Lb1 in the first direction of the body 13 after completion. Set to length.

  The amount (extension amount) α that causes the first region 20 to protrude from the first walls 130, 130 in the first direction is set according to its own thickness. Specifically, the extension amount α of the first region 20 in the first direction is set to ¼ to ３ of its own thickness. In the present embodiment, the thickness (plate thickness) of the development plate 2 (the body portion 13 and the first closing portion 14) is set to 0.3 mm to 0.8 mm, and the first region 20 (the first closing portion) in the first direction. 14) is set to ¼ to ３ (preferably ３) of the thickness of the development plate 2. In consideration of the balance between weight and rigidity, the thickness (plate thickness) of the development plate 2 (the body portion 13 and the first closing portion 14) is preferably set to 0.6 mm. The extension amount α of the first region 20 (first closing portion 14) in the direction is set to 1/3 of the thickness of the development plate 2.

  Each of the pair of second regions 21 and 21 is a region continuous with the first region 20. In the present embodiment, each of the pair of second regions 21 and 21 includes a main wall region 210 that becomes the second wall 131 and sub-wall regions 211 and 211 that become the first wall 130. More specifically, the second region 21 includes a main wall region 210 corresponding to the entire surface of the first walls 130 and 130 and a sub-wall region 211 corresponding to a half region in the second direction of the second walls 131 and 131. , 211.

  The main wall region 210 has a first end and a second end in the second direction, and a third end and a fourth end in the first direction. And the 1st end of the main wall area | region 210 is connected to the 1st area | region 20 over the full length. In the present embodiment, since the connecting portion between the first closing portion 14 and the body portion 13 is formed with a round shape (formed in a circular arc shape in cross section), the boundary between the first region 20 and the main wall region 210 is A bending region (hereinafter referred to as a first bending region) 22 is provided. In addition, the length of the 1st bending area | region 22 in a 2nd direction is set according to the roundness (curvature radius) between the 1st closure part 14 and the 1st walls 130 and 130 after completion.

  As described above, since the length of the first region 20 in the first direction is set to be longer than the length of the body portion 13 (first closing portion 14) after completion, the main wall region 210 in the first direction. Is shorter than the first region 20.

  The sub-wall regions 211 and 211 extend to both sides of the main wall region 210 in the first direction. That is, a pair of sub-wall regions 211 and 211 are provided on both sides of the main wall region 210 in the first direction. The sub-wall regions 211 and 211 have a first end and a second end in the second direction, and a third end and a fourth end in the first direction.

  In one sub-wall region 211, the third end is connected to the third end of the main wall region 210, and in the other sub-wall region 211, the third end is connected to the fourth end of the main wall region 210. Has been. In the present embodiment, since the corner portion of the first closing portion 14 is formed with a rounded shape (formed in a circular arc shape in cross section), the boundary between the main wall region 210 and the sub wall region 211 is a bent region (hereinafter, A second bending region 212) is provided. In addition, the length of the 2nd bending area | region 212 in a 1st direction is set according to the roundness (curvature radius) of the corner | angular part of the 1st obstruction | occlusion part 14 after completion.

  The lengths of the sub-wall regions 211 and 211 in the second direction are set to be the same as or substantially the same as the length of the main wall region 210 in the second direction. The first ends of the sub-wall regions 211 and 211 are arranged in the same row as the first end of the main wall region 210. Accordingly, the second ends of the sub-wall regions 211 and 211 are arranged in the same row as the second end of the main wall region 210.

  As shown in FIG. 5, the lid plate 3 is formed corresponding to the shape of the second closing portion 15 after completion. Therefore, the lid plate 3 according to the present embodiment is formed in a square shape in plan view. Accordingly, the lid plate 3 has a first end and a second end in the second direction, and a third end and a fourth end in the first direction. In the present embodiment, the length of the lid plate 3 in the first direction is set longer than the length of the lid plate 3 in the second direction.

  The lid plate 3 is formed corresponding to the shape of the second closing part (bottom part) 15 after completion. Therefore, in this embodiment, the length of the lid plate 3 in the first direction is set longer than the length of the lid plate 3 in the second direction.

  Specifically, in the present embodiment, a middle stage 13 (body 13 with both ends open) formed by processing the development plate 2 and a completed body 13 (opening is closed). The length La2 of the lid plate 3 in the first direction is determined based on the assumption that the dimensions of the body portion 13) in the first direction and the second direction are the same in the first direction. It is set to a length obtained by adding a predetermined length 2α to the dimension Lb1 in the first direction of the two closed portions 15). In other words, the lid plate 3 (the second closed portion 15 before completion) is outside with a predetermined extension amount α from each of the outer surfaces (the outer surfaces of the pair of first walls 130, 130) on both sides of the body portion 13 in the first direction. The length La1 of the lid plate 3 in the first direction is a length obtained by adding a length 2α twice the predetermined extension amount α to the dimension Lb1 in the first direction of the body portion 13 after completion. Set to

  The amount (extension amount) α that causes the lid plate 3 to protrude from the first walls 130, 130 in the first direction is set according to its own thickness. Specifically, the extension amount α of the lid plate 3 in the first direction is set to ¼ to ３ of its own thickness. In this embodiment, the thickness (plate thickness) of the lid plate 3 is set to 0.3 mm to 0.8 mm, and the extension amount α of the lid plate 3 (second closing portion 15) in the first direction is The thickness is set to 1/4 to 1/3 (preferably 1/3). In consideration of the balance between weight and rigidity, the thickness (plate thickness) of the lid plate 3 is preferably set to 0.6 mm, as in the case of the development plate 2, and in this case, the lid plate in the first direction The extension amount α of 3 is set to 1/3 of the thickness of the development plate 2.

  Further, on the assumption that the lid plate 3 is an independent member with respect to the development plate 2, the length La3 of the lid plate 3 in the second direction is the completed body portion 13 (second closed portion 15 after completion). ) In the second direction dimension Lb2 is set to a length obtained by adding a predetermined length 2α. That is, the lid plate 3 (the second closing portion 15 before completion) is outside with a predetermined extension amount α from each of the outer surfaces (the outer surfaces of the pair of second walls 131 and 131) on both sides of the body portion 13 in the second direction. The length La3 of the lid plate 3 in the second direction so as to protrude is a length obtained by adding a length 2α twice the predetermined extension amount α to the dimension Lb2 in the second direction of the body portion 13 after completion. Set to

  The amount (extension amount) α that causes the lid plate 3 to protrude from the second walls 131 and 131 in the second direction is also set according to its own thickness. Specifically, the extension amount α of the lid plate 3 in the second direction is set to ¼ to ３ of its own thickness. In this embodiment, the thickness (plate thickness) of the lid plate 3 is set to 0.3 mm to 0.8 mm, and the extension amount α of the lid plate 3 (second closing portion 15) in the second direction is The thickness is set to 1/4 to 1/3 (preferably 1/3). As described above, the thickness (plate thickness) of the lid plate 3 is preferably set to 0.6 mm. In this case, the extension amount α of the lid plate 3 in the second direction is also the same as that of the development plate 2. It is set to 1/3 of the thickness. Although not numbered in the figure, the lid plate 3 is provided with a hole for conducting the external terminal 12 and the electrode body 10.

  The development plate 2 and the lid plate 3 are as described above. Then, the method (procedure) which produces the exterior body 11 using these is demonstrated.

  First, the development plate 2 is bent. More specifically, as shown in FIGS. 6A and 6B, the unfolding plate 2 is formed by bending the boundary (first bending region 22) between the first region 20 and the second regions 21 and 21 (main wall region 210). At the same time, the boundary (second bending region 212) between the main wall region 210 and the sub-wall regions 211 and 211 is bent. That is, using the press brake, the first bending region 22 is bent in an arc shape in the second direction, and the second bending region 212 is bent in an arc shape in the first direction. In addition, you may perform any bending process with respect to the 1st bending area | region 22 and the 2nd bending area | region 212 previously.

  In this way, the development plate 2 is bent, so that each of the pair of second regions 21 and 21 is perpendicular to or substantially perpendicular to the first region 20 with respect to the first region 20. Standing up. That is, the main wall region 210 and the sub-wall regions 211 and 211 in the second regions 21 and 21 are raised from the first region 20 in a state of being perpendicular to or substantially perpendicular to each other.

  As a result, the main wall region 210 of one second region 21 stands along the first end of the first region 20. Accordingly, in one second region 21, one subwall region 211 stands on the first end of the first region 20 and the other subwall region 211 is on the second end of the first region 20. Stand up. On the other hand, the main wall region 210 of the other second region 21 stands along the second end of the first region 20. Accordingly, in the other second region 21, one subwall region 211 stands on the first end of the first region 20, and the other subwall region 211 is on the second end of the first region 20. Stand up.

  And the 4th end of one subwall area | region 211,211 of a pair of 2nd area | regions 21 and 21 opposes in the state which adjoined, and the other subwall area | region 211,211 of a pair of 2nd area | regions 21,21 It will be in the state which faced in the state which 4th ends adjoined. Accordingly, the fourth ends of the sub-wall regions 211 and 211 adjacent to each other are butt welded.

  More specifically, after the fourth ends of the sub-wall regions 211 and 211 are brought close to each other, the fourth ends of the sub-wall regions 211 and 211 that are close to each other are butt welded using a laser welding machine. Is done. At this time, the first end of the sub-wall regions 211 and 211 is set to the welding start position SP1, and the second end side of the sub-wall regions 211 and 211 is set to the welding end position. In this way, the sub-wall regions 211 and 211 are welded to each other, so that the pair of second regions 21 and 21 are connected to each other to form an annular body 13. Accordingly, the first region 20 becomes the first closing portion 14 disposed on the open end of the body portion 13.

  In the development plate 2 according to the present embodiment, as described above, the length of the first region 20 in the first direction is set longer by the predetermined length 2α than the length Lb1 of the body portion 13 in the first direction. Therefore, as described above, the barrel portion 13 is formed so that the end portion of the first closing portion 14 in the first direction protrudes outward from the outer periphery of the barrel portion 13 with a predetermined extension amount α. The first closing portion 14 is disposed on the 13 open ends. In the present embodiment, the open ends of the body portion 13 so that both end portions of the first closing portion 14 in the first direction protrude outward from the outer periphery of the body portion 13 (the respective outer surfaces of the pair of first walls 130 and 130). A first closing portion 14 is disposed on the top.

  In this state, the outer periphery of the body portion 13 and the end portion of the first closing portion 14 protruding from the outer periphery of the body portion 13 are laser-welded. In the present embodiment, the fourth ends of the sub-wall regions 211 and 211 are laser-welded to form the body portion 13, so that the body portion 13 has a welding line extending in a direction perpendicular to the first closing portion 14. WL is formed (see FIG. 6B). In connection with this, when welding the trunk | drum 13 and the 1st obstruction | occlusion part 14, the welding line WL top is set to welding start position SP1. Therefore, in this embodiment, after the half area | region in the 2nd direction and the 1st obstruction | occlusion part 14 of the 2nd walls 131 of the trunk | drum 13 are welded, of the 2nd walls 131 of the trunk | drum 13 The remaining half region in the second direction and the first closing portion 14 are welded.

  Thus, when welding the trunk | drum 13 (2nd wall 131,131) and the 1st obstruction | occlusion part 14 (in the step of laser welding), the 1st protruded from the outer periphery of this trunk | drum 13 with the outer periphery of the trunk | drum 13. The end of the closing part 14 is melted. In connection with this, even if a part of the body part 13 and the closed part to be welded melted by laser welding (keyhole type welding), the end part of the melted first closed part 14 melted down. It flows into the part (the missing part) and fills that part. Thereby, the trunk | drum 13 and the 1st obstruction | occlusion part 14 melt | dissolve, and the liquid-tightness and airtightness between the trunk | drum 13 and the 1st obstruction | occlusion part 14 are ensured.

  In this state, the trunk portion 13 and the first closing portion 14 constitute a container in which an opening is formed on one surface. That is, an opening that is open at the second ends of the first wall 130 and 130 and the second wall 131 and 131 of the trunk portion 13 is formed, and the first wall 130 and 130 and the second wall 131 and 131 of the trunk portion 13 are formed. A container is formed in which the opening formed at the first end is sealed by the first closing portion 14. Accordingly, in this state, the first closing portion 14 constitutes the bottom portion of the container.

  In the present embodiment, after the electrode body 10 is inserted into the trunk portion 13 from the opening of the trunk portion 13 (container), as shown in FIGS. 7A and 7B, the second closing portion 15 (the lid plate 3). ) Is disposed on the open end of the body portion 13. In the present embodiment, as described above, the second closing portion 15 (lid plate 3) has a length La2 in the first direction and a length La3 in the second direction, and the length Lb1 in the first direction of the body portion 13 and the first length Lb1. It is set longer than the length Lb2 in the two directions. Accordingly, the second closing portion 15 (lid plate 3) is placed on the opening end of the trunk portion 13 so that the end portion (outer circumference end portion entire circumference) of the second closing portion 15 protrudes outward from the outer circumference circumference of the trunk portion 13. Is placed.

  In this state, the entire outer periphery of the body portion 13 and the entire periphery of the end portion of the second closing portion 15 protruding from the outer periphery of the body portion 13 are laser-welded. In this embodiment, since the welding line WL is formed in the trunk | drum 13 as mentioned above, this welding line WL top is set to welding start position SP2. In connection with this, when welding the trunk | drum 13 and the 2nd obstruction | occlusion part 15, half in the 2nd direction of each of the 1st wall 130 and the 2nd walls 131 and 131 on both sides of this 1st wall 130 in each. Are welded to the second closing portion 15, and the other half of the first wall 130 and the second walls 131, 131 on both sides of the first wall 130 in the second direction (the remaining half). ) Is welded to the second closing portion 15.

  As described above, when the body portion 13 (second wall 131, 131) and the second closing portion 15 are welded (in the laser welding step), the outer portion of the body portion 13 protrudes from the outer periphery of the body portion 13 together with the outer periphery of the body portion 13. The ends of the two closed portions 15 are melted. In connection with this, even if a part of the body part 13 and the second closing part 15 to be welded melts by laser welding (keyhole type welding), the end part of the melted second closing part 15 remains. It flows into the melted part (missing part) and fills that part. Thereby, the trunk | drum 13 and the 2nd obstruction | occlusion part 15 melt | dissolve, and the liquid-tightness and airtightness between the trunk | drum 13 and the 2nd obstruction | occlusion part 15 are ensured.

  As mentioned above, according to the manufacturing method of the exterior body 11 for the electrical storage element 1 according to the present embodiment, by laser welding (keyhole type welding), a part of the trunk portion 13 and the blocking portion that are the welding targets. Even if the metal melts, the melted part (missing part) is filled with the end part of the closed part (the protruding part), so that the liquid-tightness and airtightness between the body part 13 and the closed part are ensured. Is done.

  Therefore, the manufacturing method according to the present embodiment suppresses the occurrence of welding failure when laser welding the barrel portion 13 that can surround the electrode body 10 and the closing portions 14 and 15 that close the opening of the barrel portion 13. An excellent effect that it can be performed can be achieved.

  And the manufacturing method which concerns on this embodiment WHEREIN: As a step which produces the trunk | drum 13, the step which bends the expansion | deployment plate 2 which has the area | region used as the trunk | drum 13, and the trunk | drum 13 in the expansion | deployment plate 2 bent. And a step of forming a welding line WL extending in a direction intersecting the closing portions 14 and 15 by laser welding, so that there are less restrictions on the shape and dimensions in manufacturing the exterior body 11. . Therefore, the exterior body 11 having a required form can be appropriately manufactured. Further, in the step of producing the body portion 13, an expensive mold is not required, so that the cost can be reduced.

  Further, in the laser welding step, the welding line WL is set at the welding start positions SP1 and SP2, so that the welding mark formed at the start of laser welding welding is not conspicuous with the welding line WL, and the body part 13 and the blocking part are formed. The welded portion (weld line) with 14 and 15 is improved in appearance.

  Then, in the step of disposing the closing portions 14 and 15 on the opening end portion of the trunk portion 13, the protrusion amount α of the end portions of the closing portions 14 and 15 protruding from the outer periphery of the trunk portion 13 is the thickness of the closing portions 14 and 15. Since it is set to ¼ to ３, in the laser welding step, the whole or substantially the whole of the end portions of the closing portions 14 and 15 can be melted, and the end portions of the closing portions 14 and 15 are barreled after welding. The exterior body 11 can be formed with good appearance without remaining in a state of protruding from the outer periphery of the portion 13.

  In addition, this invention is not limited to the said embodiment, Of course, it can change suitably in the range which does not deviate from the summary of this invention.

  In the above embodiment, in the step of laser welding the body portion 13 and the closing portions 14 and 15, the welding line WL is set to the welding start positions SP1 and SP2, but the present invention is not limited to this. For example, in the laser welding step, the outer periphery of the body portion 13 and the ends of the closing portions 14 and 15 are passed so as to pass through the end portions of the welding line WL (positions set at the welding start positions SP1 and SP2 in the above embodiment). The part may be laser welded. That is, in the laser welding step, a position away from the welding line WL (for example, one end of the unwelded portions of the body portion 13 and the closed portions 14 and 15) is set as a welding start position, Laser welding may be performed toward a position symmetrical with respect to the welding start position (for example, the other end of the unwelded portions of the body portion 13 and the closed portions 14 and 15). If it does in this way, with respect to the welding trace of the welding line WL formed in the closure part 14 and 15 vicinity by producing the trunk | drum 13 (butt-welding the area | region (2nd area | region) 21 used as a trunk | drum), A welding line formed by laser welding the outer periphery of the body portion 13 and the end portions of the closing portions 14 and 15 is formed in an overlapping manner. Therefore, since the welding trace of the welding line WL in the vicinity of the closed portions 14 and 15 is erased by the welding line formed by laser welding, the appearance can be finished with good appearance.

  In the said embodiment, although the 1st obstruction | occlusion part 14 and the trunk | drum 13 (container) were formed by carrying out the bending process and the welding process of the one expansion | deployment plate 2, this invention is not limited to this. For example, the first closing part 14 and the body part 13 may be continuously formed without a seam by press-molding or drawing-molding a metal material. In this case, it is not necessary to perform a welding process in forming the body part 13 and the first closing part 14, but the second closing part 15 is arranged so as to protrude from the outer periphery of the body part 13 as in the above embodiment. Then, the end protruding from the outer periphery of the body portion 13 and the outer periphery of the body portion 13 are laser welded over the entire periphery. Therefore, even in this case, when the body portion 13 and the second closing portion 15 are laser-welded, it is possible to achieve an excellent effect that the occurrence of poor welding can be suppressed.

  Moreover, in the said embodiment, although the 1st obstruction | occlusion part 14 and the trunk | drum 13 (container) were made into the aspect connected partially by processing the expansion | deployment plate 2, it is not limited to this. For example, the first closing portion 14 may be configured separately from the body portion 13, similarly to the second closing portion 15. In this case, similarly to the second closing portion 15, the length of the first closing portion 14 in the first direction and the second direction is set longer than the lengths Lb1 and Lb2 of the body portion 13 in the first direction and the second direction. Is done. And the 1st obstruction | occlusion part 14 is arrange | positioned on the opening end of the trunk | drum 13, so that the edge part of the 1st obstruction | occlusion part 14 may protrude outside from the outer periphery of the trunk | drum 13, and the outer periphery of the opening end part of the trunk | drum 13 The end of the first closing portion 14 is laser welded. Accordingly, as in the case where the second closing portion 15 of the above embodiment is welded to the body portion 13, the body portion 13 and the first closing portion 14 are melted together, so that the occurrence of poor welding can be suppressed. it can.

  In the said embodiment, although the trunk | drum 13 and the 1st obstruction | occlusion part 14 were formed from the expansion | deployment plate 2 in which a pair of 2nd area | regions 21 and 21 were symmetrically connected with respect to the 1st area | region 20, it is not limited to this. For example, the development plate 2 to which the first region 20 is connected to the second region 21, 21 (the second region 21, 21 that becomes the body 13 by being butted at both ends), or the first region From the development plate 2 to which three or more second regions 21 and 21 (three or more second regions 21 and 21 that become the body portion 13 by being butt welded to each other) are connected to the cylinder 20. The part 13 and the first closing part 14 may be formed.

  Moreover, in the said embodiment, although the trunk | drum 13 was formed in the square ring shape, it is not limited to this. For example, the trunk | drum 13 may be formed in the annular | circular shape.

  In the above embodiment, a description will be given on the premise that a part of the outer periphery of the first closing part 14 is welded to the body part 13 and the entire outer periphery of the second closing part 15 is welded to the body part 13. However, it is not limited to this. For example, one of the first closed portion 14 and the second closed portion 15 is welded to the body portion 13 at the entire outer periphery or part of the outer periphery of either the first closed portion 14 or the second closed portion 15, and The other may be attached to the body portion 13 by a method other than welding.

  Therefore, the present invention includes manufacturing the container having the opening of one of the body parts 13 as the exterior body 11 on the assumption that the body part 13 and the closing parts 14 and 15 are laser welded. To do. Although not particularly mentioned in the above embodiment, the term “storage element” in the present invention includes various batteries such as lithium ion batteries and nickel metal hydride batteries, and capacitors (electric double layer capacitors and the like).

  DESCRIPTION OF SYMBOLS 1 ... Power storage element, 2 ... Deployment plate, 3 ... Cover plate, 10 ... Electrode body, 11 ... Exterior body, 12 ... External terminal, 13 ... Body part, 14 ... 1st obstruction | occlusion part (occlusion part), 15 ... 2nd Blocking part (blocking part), 20 ... first region, 21 ... second region, 22 ... first bending region (bending region), 130 ... first wall, 131 ... second wall, 210 ... main wall region, 211 ... Sub-wall region, 212 ... second bending region (bending region), E ... edge, SP1, SP2 ... welding start position, WL ... welding line

Claims (5)

  In the method of manufacturing an exterior body for an electricity storage device, which includes an annular body that can surround an electrode body, and a closing part that closes the opening, an end of the closing part is a body having an opening. A step of disposing the blocking portion on the opening end of the barrel portion so as to protrude outward from the outer periphery of the barrel portion; an outer periphery of the barrel portion; and an end portion of the blocking portion protruding from the outer periphery of the barrel portion A method of manufacturing an exterior body for a power storage device, comprising:   The method further comprises the step of producing the body part, and the step of producing the body part comprises the step of bending a development plate having a region to become the body part, and the body part in the bent development plate. 2. The method according to claim 1, further comprising: welding a region and forming a welding line extending in a direction intersecting the blocking portion, wherein the welding line is set at a welding start position in the laser welding step. A method for manufacturing an exterior body for a storage element.   The method further comprises the step of producing the body part, and the step of producing the body part comprises the step of bending a development plate having a region to become the body part, and the body part in the bent development plate. Butt welding the region and forming a weld line extending in a direction intersecting the closed portion, and in the laser welding step, an outer periphery of the barrel portion so as to pass through an end of the weld line; The manufacturing method of the exterior body for electrical storage elements of Claim 1 which laser welds the edge part of the said obstruction | occlusion part.   The unfolding plate is a region that is continuous with the region that becomes the body portion, and has a region that becomes the closing portion, and in the bending step, the region that becomes the body portion and the closing portion in the unfolding plate Bending the boundary with the region to be formed, bending the region to be the body into an annular shape, and forming a weld line to butt weld the region to be the annular body. The manufacturing method of the exterior body for electrical storage elements of 2 or Claim 3.   In the step of disposing the blocking portion on the opening end of the trunk portion, the amount of protrusion of the end of the blocking portion protruding from the outer periphery of the trunk portion is ¼ to ３ of the thickness of the blocking portion. The manufacturing method of the exterior body for electrical storage elements of any one of Claim 1 thru | or 4.

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