JP2015035264A - Manufacturing method of power storage element and power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a power storage element which omits time-consuming masking work and thereby reduces the costs.SOLUTION: An insulation coating is performed to an outer side surface 10a of a container body 10 to remove an insulator film 50 of the outer side surface 10a which is located near an opening end 10b of the container body 10. Then, the container body 10 and a lid 11 attached to the opening end 10b of the container body 10 are welded at the opening end 10b to make a seal.

Description

  The present invention relates to a method for manufacturing a power storage element and a power storage element.

  Conventionally, as a manufacturing method of an electrical storage element, there exists a thing described in Unexamined-Japanese-Patent No. 2012-199021 (patent document 1). In this method for manufacturing an electricity storage element, the outer surface of the container body is coated with resin before the container body and the lid are welded. In this case, the periphery of the joint between the container body and the lid is in a state where the surfaces of the container body and the lid are exposed without coating the resin.

JP 2012-199021 A

  By the way, in the conventional method for manufacturing a power storage device, if the container body is to be resin-coated without resin coating around the joint portion between the container body and the lid, it is necessary to mask the periphery of the joint portion. This masking operation is time-consuming and expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a power storage element and a power storage element that can save time and labor for masking and can reduce costs.

In order to solve the above-mentioned problem,
A removal step of removing the insulation-coated insulating film on the outer surface near the open end of the container body;
And a welding step of welding and sealing the container body and a lid placed on the opening end of the container body at the opening end.

  Here, “near the opening end” means a certain region including the opening end. This constant region has a constant width from the opening end to the bottom (bottom) direction. This constant width is, for example, the width of the bead portion formed by welding the container body and the lid at the opening end. It is larger than half, preferably 1.5 times the half of the width of the bead portion. “Insulating coating” is, for example, powder coating, electrodeposition coating, spray coating, or the like.

  According to the method for manufacturing an electricity storage device of the present invention, the insulating film on the outer surface near the opening end of the container body is removed, and the container body and the lid body that covers the opening end of the container body are welded at the opening end. And seal. This eliminates the need for masking for exposing the outer surface near the opening end of the container main body, eliminates the laborious masking work, and reduces the cost.

  In one embodiment of the method for manufacturing a power storage device, the removal of the insulating film from the container body in the removing step and the welding of the container body and the lid in the welding step are performed by laser light irradiation. Do.

  According to the method for manufacturing the electricity storage device of this embodiment, the removal of the insulating film from the container body in the removing step and the welding of the container body and the lid in the welding step are performed by laser light irradiation. So removal and welding can be done in the same simple way.

  Moreover, in the manufacturing method of the electrical storage element of one Embodiment, the spot light of the laser beam in the said removal process is larger than the spot light of the laser beam in the said welding process.

  According to the method for manufacturing a storage element of this embodiment, the spot light of the laser beam in the removal process is larger than the laser spot light in the welding process, so that the width of removal of the insulating film in the removal process is increased. It is possible to prevent welding failure and spatter scattering in the welding process. Further, in the removing process and the welding process, it is only necessary to change the size of the spot light of the laser light, and the same laser device can be used.

  Moreover, in the manufacturing method of the electrical storage element of one Embodiment, the laser beam in the said removal process faces the direction different from the direction orthogonal to the outer surface of the said container main body.

  According to the method for manufacturing an electricity storage device of this embodiment, the laser light in the removal step is directed in a direction different from the direction orthogonal to the outer surface of the container body, and thus the spot light of the laser beam in the removal step can be easily obtained. Can be big.

  In one embodiment of the method for manufacturing a power storage element, the output of the laser beam in the removing step is smaller than the output of the laser beam in the welding step.

  According to the method for manufacturing the electricity storage device of this embodiment, the output of the laser beam in the removal step is smaller than the output of the laser beam in the welding step. Only the membrane can be easily removed.

  Moreover, in the manufacturing method of the electrical storage element of one Embodiment, before the said removal process, the cutting part which cut | disconnects the opening part of the said container main body by irradiation of a laser beam, and shape | molds the opening end of the said container main body is provided.

  According to the method of manufacturing the electricity storage device of this embodiment, the opening of the container body is cut by laser light irradiation to form the opening end of the container body. Welding can be performed.

Moreover, in the electricity storage device of one embodiment,
A container body having an open end;
A lid that covers the open end of the container body,
At the boundary between the outer surface of the container body and the outer surface of the lid body, a bead portion formed by welding the container body and the lid body at the opening end is provided,
A laser irradiated portion formed by irradiating a laser beam is provided on a portion of the outer side surface of the container body on the bottom side of the bead portion.

  According to the electricity storage device of this embodiment, the laser irradiated portion is provided on the outer side surface of the container body on the bottom side of the bead portion. Thereby, as a method for manufacturing this power storage element, for example, the outer surface of the container body is insulatively coated, and the insulating film on the outer surface near the opening end of the container body is removed by laser light, and then the container body and the lid body Are sealed by welding with laser light at the open end. Therefore, masking for exposing the outer surface in the vicinity of the opening end of the container main body is not necessary, so that a troublesome masking operation can be omitted and the cost can be reduced.

  According to the method for manufacturing an electricity storage device of the present invention, the insulating film on the outer surface near the opening end of the container body is removed, and the container body and the lid body that covers the opening end of the container body are welded at the opening end. And seal. Therefore, a laborious masking operation can be omitted and the cost can be reduced.

  According to the electricity storage device of the present invention, the laser irradiated portion is provided on the outer surface of the container body on the bottom side of the bead portion. Thereby, as a method for manufacturing this power storage element, for example, the outer surface of the container body is insulatively coated, and the insulating film on the outer surface near the opening end of the container body is removed by laser light, and then the container body and the lid body Are sealed by welding with laser light at the open end. Therefore, masking for exposing the outer surface near the opening end of the container main body is not necessary, and a troublesome masking operation can be omitted, and costs can be prevented.

It is a disassembled perspective view which shows the electrical storage element of one Embodiment of this invention. It is a perspective view which shows the manufacturing method of an electrical storage element. It is a perspective view which shows the manufacturing method of an electrical storage element. It is a perspective view which shows the manufacturing method of an electrical storage element. It is a perspective view which shows the manufacturing method of an electrical storage element. It is a perspective view which shows the manufacturing method of an electrical storage element. It is sectional drawing which shows the manufacturing method of an electrical storage element. It is sectional drawing which shows the manufacturing method of an electrical storage element. It is sectional drawing which shows the manufacturing method of an electrical storage element. It is sectional drawing which shows the manufacturing method of an electrical storage element. It is sectional drawing which shows the manufacturing method of an electrical storage element. It is a side view of an electrical storage element. It is a side view of another electrical storage element. It is a side view which shows the manufacturing method of an electrical storage element. It is a side view which shows the manufacturing method of an electrical storage element. It is a side view which shows the manufacturing method of an electrical storage element. It is a side view which shows the manufacturing method of an electrical storage element. It is a perspective view which shows the manufacturing method of an electrical storage element.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a perspective view showing a power storage device according to an embodiment of the present invention. As shown in FIG. 1, the electric storage element includes a container 1 and an electrode body 3 accommodated in the container 1. This power storage element is, for example, a nonaqueous electrolyte secondary battery such as a lithium ion battery.

  The container 1 is made of, for example, aluminum or an aluminum alloy. The container 1 includes a container body 10 having an opening and a lid 11 that closes the opening of the container body 10.

  The electrode body 3 includes a positive electrode side metal layer 31 and a negative electrode side metal layer 32 as electrodes, and a separator. The positive electrode side metal layer 31 includes an aluminum foil and a positive electrode active material layer formed on both surfaces of the aluminum foil. The negative electrode side metal layer 32 includes a copper foil and a negative electrode active material formed on both surfaces of the copper foil. It consists of a material layer. The separator is made of a porous resin film. The separator is disposed between the positive electrode side metal layer 31 and the negative electrode side metal layer 32 so as to cover both active material layers. The positive electrode side metal layer 31, the negative electrode side metal layer 32, and the separator are laminated.

  The positive electrode side metal layer 31, the negative electrode side metal layer 32, and the separator are strip-shaped, and the positive electrode side metal layer 31 and the negative electrode side metal layer 32 are shifted from each other on the opposite side in the width direction. It is wound in an oval shape in the state. That is, the positive electrode side metal layer 31 is exposed at one axial end portion of the electrode body 3, and the negative electrode side metal layer 32 is exposed at the other axial end portion of the electrode body 3. Further, no separator is interposed between the positive electrode side metal layer 31 and the negative electrode side metal layer 32 at both ends of the electrode body 3.

  The electrode body 3 is disposed horizontally so that the oval flat side surface 3a stands upright. Current collectors 4 are disposed at both ends of the electrode body 3, respectively. That is, the current collector 4 is provided on each of the positive electrode side and the negative electrode side. The positive electrode side current collector 4 is made of aluminum, and the negative electrode side current collector 4 is made of copper. The current collector 4 is accommodated in the container 1.

  External terminals 2 are attached to the lid body 11 at positions corresponding to both ends of the electrode body 3. That is, the external terminal 2 is provided on each of the positive electrode side and the negative electrode side. The external terminal 2 on the positive electrode side is made of aluminum, and the external terminal 2 on the negative electrode side is made of copper. A part of the external terminal 2 is disposed outside the container 1.

  The positive electrode side metal layer 31 at one end of the electrode body 3 is electrically connected to the external terminal 2 on the positive electrode side via the current collector 4 on the positive electrode side. The negative electrode side metal layer 32 at the other end of the electrode body 3 is electrically connected to the negative electrode side external terminal 2 via the negative electrode side current collector 4.

  The current collector 4 has two plate-like current collectors 41. The current collector 41 extends downward along the side surface 3 a of the electrode body 3. The two current collectors 41 of the positive current collector 4 sandwich the positive metal layer 31, and the two current collectors 41 of the negative current collector 4 sandwich the negative metal layer 32.

  The external terminal 2 has a connecting rod 21 and a bolt 22. The connecting rod 21 is located outside the lid body 11. The bolt 22 is screwed into the connecting rod 21, and the tip of the bolt 22 protrudes upward. A packing 5 is attached between the connecting rod 21 and the lid 11.

  The current collector 4, the lid body 11, and the connection rod 21 are connected by a rivet (not shown). Thus, the current collector 4 is electrically connected to the external terminal 2. The current collector 4 and the external terminal 2 are integrally fixed to the lid body 11.

  Next, a method for manufacturing the electricity storage device having the above configuration will be described.

  As shown in FIG. 2A, the container body 10 is formed by deep drawing, and as shown in FIG. 2B, insulation coating is performed on the outer surface 10a of the container body 10 (hereinafter referred to as a pre-coating step). As a result, an insulating film 50 (shown by alternate long and short dashed lines) is formed on the outer surface 10 a of the container body 10. The insulation coating in the pre-coating process is powder coating. Powder coating is to apply a powder coating to an object to be coated and to heat and bake the powder coating.

  Thereafter, as shown in FIG. 2C, the opening of the container body 10 is cut to form the opening end 10b of the container body 10 (hereinafter referred to as a cutting step). As this cutting method, for example, there are laser light irradiation, press working, cutting, and the like, and as shown in FIG. 2D, an electrode body fixed integrally with the lid 11 in the container body 10 3 is inserted, and the cover body 11 is put on the open end 10b of the container body 10 as shown in FIG. 2E.

  Thereafter, as shown in FIG. 3A, the insulating film 50 coated on the outer surface 10a in the vicinity of the opening end 10b of the container body 10 is irradiated with laser light L from the laser device 60 to evaporate the insulating film 50. It removes (henceforth a removal process), and as shown to FIG. 3B, the outer side surface 10a (metal surface) of the container main body 10 is exposed. Here, the vicinity of the opening end 10b refers to a certain region including the opening end 10b. This constant region has a constant width H from the open end to the bottom (bottom) direction. The constant width H is, for example, larger than a half of a width W of a bead portion 71 (shown in FIG. 4B), which will be described later, and preferably 1.5 times a half of a width W of the bead portion 71.

  Thereafter, as shown in FIG. 4A, a laser beam L is irradiated from the laser device 60 to the boundary between the outer surface 10a (metal surface) of the container body 10 and the outer surface 11a (metal surface) of the lid body 11, As shown in FIG. 4B, the container body 10 and the lid body 11 are welded and sealed at the open end 10b (hereinafter referred to as a welding process). At this time, a bead portion 71 formed by welding is provided at the boundary between the outer surface 10 a of the container body 10 and the outer surface 11 a of the lid 11.

  The output of the laser beam L in the removal step (FIG. 3A) is smaller than the output of the laser beam L in the welding step (FIG. 4A). Thereby, in the removal process, the output of the laser beam L can be weakened, and only the insulating film 50 can be easily removed.

  At this time, the spot light of the laser beam L in the removal step may be larger than the spot light of the laser beam L in the welding step. Thereby, the removal width H of the insulating film 50 in the removal process can be widened, and poor welding and spatter scattering in the welding process can be prevented. Further, in the removing process and the welding process, it is only necessary to change the size of the spot light of the laser light L, and the same laser device 60 can be used.

  Here, as shown in FIG. 5, the laser beam L in the removing step may be directed in a direction different from the direction orthogonal to the outer surface 10 a of the container body 10. More specifically, the laser beam L is irradiated so as to be inclined with respect to the outer surface 10a of the container body 10 from the top to the bottom as viewed from the side of the container body 10. By doing so, the spot light of the laser light L in the removal process can be easily increased. Note that the laser beam L may be directed in a direction different from the direction orthogonal to the outer surface 10a of the container body 10 when viewed from above the container body 10 (plan view). In addition, the laser beam L may run a plurality of times along the circumferential direction of the outer side surface 10a of the container body 10.

  At this point, when the power storage element is viewed from the side, a bead portion formed by welding is formed at the boundary between the outer surface 10a of the container body 10 and the outer surface 11a of the lid 11 as shown in FIG. 6A. 71 is provided. In addition, a plurality of laser irradiated portions 72 are continuously provided on the bottom side (lower side) of the bead portion 71 on the outer surface 10a of the container body 10. The laser irradiated portion 72 is a laser mark formed by irradiating a laser beam in the removing step (FIG. 3A). The shape of the laser irradiated portion 72 is an arc shape, but may be a dot shape as shown in FIG. 6B.

  Further, as shown in FIG. 7A, a non-insulated region Z that is not insulated is provided in the vicinity of the boundary between the outer side surface 10a of the container body 10 and the outer side surface 11a of the lid 11. Here, the vicinity of the boundary means a certain region including the boundary (open end 10b). This constant region (that is, the non-insulating region Z) has a constant width in the vertical direction across the boundary, and this constant width is larger than, for example, the width W of the bead portion 71 shown in FIG. The width W of the bead portion 71 is 1.5 times. An insulating film 50 that is powder-coated in the pre-coating process is provided on the bottom side of the container body 10 with respect to the non-continuous region Z.

  Thereafter, as shown in FIG. 7B, the non-insulating region Z between the container main body 10 and the lid 11 is subjected to insulating coating (hereinafter referred to as a post-coating step). The insulating coating in the subsequent coating process is powder coating.

  More specifically, the lid 11 is covered with an upper masking jig 81 and the container body 10 is covered with a lower masking jig 82. Then, the non-insulating region Z is exposed using the upper and lower masking jigs 81 and 82. At this time, only the non-insulating region Z is exposed, but in addition to the non-insulating region Z, the insulating film 50 of the container body 10 may be slightly exposed.

  The upper and lower masking jigs 81 and 82 are electrically insulated from the non-insulating region Z (made of a metal surface). The material of the masking jigs 81 and 82 may be any material that is electrically insulated from the non-insulating region Z, such as ceramic, metal whose surface is insulated, or resin.

  Thereafter, the non-insulating region Z is charged with a positive or negative charge, and the powder coating material charged with a charge opposite to the non-insulating region Z is subjected to the action of static electricity as shown by the hatching of dots in FIG. 7B. Then, it is adhered to the non-insulating region Z.

  Thereafter, the powder paint adhering to unnecessary portions such as the upper and lower masking jigs 81 and 82 is removed by air blow or the like. Then, the powder coating material adhered to the non-insulating region Z is subjected to electromagnetic induction heating by the heating device 61. As a result, as shown in FIG. 7C, the non-insulating region Z is provided with an insulating film 51 that is powder-coated (indicated by a dashed line hatching).

  Thus, by using electromagnetic induction heating, it can heat locally and does not transmit heat to the electrode body 3 accommodated in the container main body 10. Further, since the masking jigs 81 and 82 are electrically insulated from the non-insulating region Z, the masking jigs 81 and 82 are not charged when the non-insulating region Z is charged. Thus, even after the powder coating is electrostatically attached to the non-insulating region Z, the powder coating attached to the masking jigs 81 and 82 can be easily removed by air blow or the like. Accordingly, it is possible to prevent the masking jigs 81 and 82 from being soiled.

  Thereafter, when the upper and lower masking jigs 81 and 82 are removed, as shown in FIG. 7D, in the vicinity of the boundary between the outer side surface 10a of the container body 10 and the outer side surface 11a of the lid body 11 (non-insulating region Z). A first insulating film 51 that is powder-coated in the post-coating process is provided. Further, a second insulating film 50 powder-coated in the pre-coating process is provided on the outer surface 10 a of the container body 10 on the bottom side of the first insulating film 51. There is a boundary 53 between the first insulating film 51 and the second insulating film 50. This boundary portion 53 is generated due to a difference in thickness between the first insulating film 51 and the second insulating film 50. The thickness of the first insulating film 51 and the thickness of the second insulating film 50 are 100 μm or more in order to ensure insulation.

  The first insulating film 51 in the post-coating process and the second insulating film 50 in the pre-coating process have a good affinity, and no gap is generated between these insulating films 50 and 51. Therefore, insulation failure can be prevented.

  As shown in FIG. 7E, in the post-coating process, the first insulating film 51 is provided not only on the outer surface 11 a of the lid body 11 but also on a part of the upper surface 11 b of the lid body 11.

  Although powder coating was used as the insulating coating in the pre-coating process and the post-coating process, at least the powder coating used for powder coating in the post-coating process is preferably a low-temperature baking type powder coating. The low-temperature baking type powder coating material is, for example, an epoxy resin, and “Poserac 2000-21” (trade name) of Kawakami Paint Co., Ltd. is available. Thereby, since the baking temperature of the powder coating is 110 ° C. to 130 ° C., the thermal effect on the electrode body 3 in the container body 10 can be eliminated in the post-coating process.

  According to the method for manufacturing the electricity storage device, the insulating film 50 on the outer surface 10a in the vicinity of the opening end 10b of the container body 10 is removed, and the cover body 11 that covers the container body 10 and the opening end 10b of the container body 10 is provided. Are sealed by welding at the open end 10b. This eliminates the need for masking for exposing the outer surface 10a in the vicinity of the opening end 10b of the container body 10, thereby eliminating the time-consuming masking operation and reducing the cost.

  By the way, if the outer surface 10a of the container body 10 is originally contaminated with impurities, spatter will fly when the container body 10 and the lid body 11 are welded, resulting in a problem of poor airtightness of the container 1. . In the present invention, at the same time as removing the insulating film 50 on the outer side surface 10a of the container body 10 in the removing step. Since impurities originally attached to the outer surface 10a of the container body 10 can be removed, there is an effect of preventing the container 1 from being poorly sealed.

  Moreover, since the removal of the insulating film 50 of the container body 10 in the removal step and the welding of the container body 10 and the lid body 11 in the welding step are performed by irradiation with the laser beam L, the same simple operation is performed. Removal and welding can be performed in the manner.

  Moreover, since the opening part of the said container main body 10 is cut | disconnected by irradiation of the laser beam L, and the opening end 10b of the container main body 10 is shape | molded, a cutting | disconnection, removal, and welding can be performed by the simple same method.

  According to the power storage element, the laser irradiated portion 72 is provided on the outer side surface 10 a of the container main body 10 at the bottom side of the bead portion 71. Accordingly, as a method for manufacturing this power storage element, for example, the outer surface 10a of the container body 10 is insulated and the insulating film 50 on the outer surface 10a near the opening end 10b of the container body 10 is removed by the laser light L. Then, the container body 10 and the lid body 11 are welded and sealed with the laser beam L at the opening end 10b. Therefore, masking for exposing the outer surface 10a in the vicinity of the opening end 10b of the container body 10 is not necessary, and a troublesome masking operation can be omitted, and the cost can be reduced.

  According to the method for manufacturing the electricity storage device, the container body 10 and the lid body 11 have the non-insulating region Z in the vicinity of the boundary between the outer surface 10a of the container body 10 and the outer surface 11a of the lid body 11. Is welded and sealed at the boundary, and the non-insulating region Z between the container main body 10 and the lid body 11 is insulation-coated. Thereby, the insulation coating of the container main body 10 and the lid 11 after welding can be performed reliably, and the insulation defect of the container main body 10 and the lid 11 can be prevented. In particular, it is possible to reliably insulate a three-dimensional curved surface such as a corner of the lid 11 that cannot be handled by an insulating tape.

  In the pre-coating step and the post-coating step, the insulating coating is powder coating. Since powder coating does not use a solvent, waste liquid treatment is unnecessary.

  According to the electricity storage element, the first insulating film 51 is provided in the vicinity of the boundary between the outer surface 10a of the container body 10 and the outer surface 11a of the lid 11, and the outer surface 10a of the container body 10 has The second insulating film 50 is provided on the bottom side of the first insulating film 51, and there is a boundary portion 53 between the first insulating film 51 and the second insulating film 50. Thereby, as a manufacturing method of this electrical storage element, for example, there is a non-insulating region Z in the vicinity of the boundary between the outer surface 10a of the container body 10 and the outer surface 11a of the lid body 11, and the container body 10 and the lid body 11 is welded and sealed at the boundary, and the non-insulating region Z between the container body 10 and the lid 11 is insulatively coated. Therefore, the insulation coating of the container body 10 and the lid body 11 after welding can be reliably performed, and the insulation failure of the container body 10 and the lid body 11 can be prevented.

  In addition, this invention is not limited to the above-mentioned embodiment.

  In the above embodiment, powder coating is used as the insulating coating in the pre-coating step and the post-coating step. However, electrodeposition coating or spray coating may be used. Electrodeposition coating is the application of static electricity having different polarities to the paint and the object to be coated, and the object to be coated in the water-based paint. Spray coating is to paint by spraying a coating material with high-pressure air in the form of a mist.

  In the above embodiment, the insulating film is removed by laser light irradiation in the removing step. However, the insulating film may be removed by polishing treatment, or the insulating film may be removed by chemical treatment. .

  In the said embodiment, although the removal process was performed after installing a cover body in a container main body, you may perform before installing a cover body in a container main body.

  In the said embodiment, although the cutting process was performed after performing the pre-coating process, you may perform the pre-coating process after performing the cutting process.

  In the above embodiment, an epoxy resin is used as the powder coating used for powder coating, but a polyester resin, an acrylic resin, or the like may be used.

  In the said embodiment, although the insulating coating was used in the said post-coating process, it may replace with this and may use an insulating tape.

  In the said embodiment, although aluminum and aluminum alloy were illustrated as an example of the material of a container main body and a cover body, the effect of this invention is not restrict | limited, for example, stainless steel, iron, nickel, nickel steel, etc.

  In the above embodiment, an elliptical wound electrode body has been described, but a laminated electrode body may be used. In the above embodiment, the non-aqueous electrolyte secondary battery has been described as the power storage element, but the present invention is also applicable to a capacitor or the like.

DESCRIPTION OF SYMBOLS 1 Container 10 Container main body 10a Outer side surface 10b Open end 11 Cover body 11a Outer side surface 2 External terminal 3 Electrode body 3a Side surface 31 Positive electrode side metal layer 32 Negative electrode side metal layer 4 Current collector 41 Current collector 41 (Coating in pre-coating process) Insulating film 51 Insulating film 53 (painted in the post-coating process) 53 Boundary part 60 Laser device 61 Heating device 71 Bead part 72 Laser irradiated part 81 Upper masking jig 82 Lower masking jig H Constant width L Laser light W (Bead) width Z Non-insulating region

Claims (7)

A removal step of removing the insulation-coated insulating film on the outer surface near the open end of the container body;
A method for manufacturing an electricity storage element, comprising: a welding step of welding and sealing the container body and a lid placed on the opening end of the container body at the opening end. In the manufacturing method of the electrical storage element of Claim 1,
The method for manufacturing a storage element, wherein the removal of the insulating film from the container body in the removing step and the welding of the container body and the lid in the welding step are performed by laser light irradiation. In the manufacturing method of the electrical storage element of Claim 2,
The method for manufacturing an electricity storage element, wherein the spot light of the laser beam in the removing step is larger than the spot light of the laser beam in the welding step. In the manufacturing method of the electrical storage element of Claim 3,
The method for manufacturing a power storage element, wherein the laser light in the removing step is directed in a direction different from a direction orthogonal to the outer surface of the container body. In the manufacturing method of the electrical storage element as described in any one of Claim 2 to 4,
The method for manufacturing a power storage element, wherein an output of the laser beam in the removing step is smaller than an output of the laser beam in the welding step. In the manufacturing method of the electrical storage element as described in any one of Claim 2 to 5,
Before the said removal process, the manufacturing method of the electrical storage element characterized by including the cutting process which cut | disconnects the opening part of the said container main body by irradiation of a laser beam, and shape | molds the opening end of the said container main body. A container body having an open end;
A lid that covers the open end of the container body,
At the boundary between the outer surface of the container body and the outer surface of the lid body, a bead portion formed by welding the container body and the lid body at the opening end is provided,
A power storage element, wherein a laser irradiated portion formed by irradiating a laser beam is provided on a portion of the outer side surface of the container main body on the bottom side of the bead portion.

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