JP6260136B2 - Storage element manufacturing method and storage element - Google Patents

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 device, the surface of the container body and the lid is exposed without coating the resin around the joint between the container body and the lid. And after welding a container main body and a cover body in a junction part, an insulating tape is affixed around a junction part.

JP 2012-199021 A

  By the way, in the above conventional method for manufacturing a power storage element, an insulating tape is used around the joint between the container body and the lid, but this insulating tape can be applied to a flat or two-dimensional curved surface. It cannot handle 3D curved surfaces.

  Generally, the outer surface of the container body is a flat surface or a two-dimensional curved surface, but in order to cover the container body to the cover plate integrally, it is indispensable to deal with the three-dimensional curved surface. I can not cope.

  Accordingly, an object of the present invention is to provide a method for manufacturing a storage element and a storage element that can reliably perform insulation coating of the container body and the lid after welding, and can prevent insulation failure between the container body and the lid. It is in.

In order to solve the above-mentioned problem,
A welding step of having a non-insulated region that is not insulated in the vicinity of the boundary between the outer surface of the container body and the outer surface of the lid, and welding and sealing the container body and the lid at the boundary; ,
And a coating step of insulatingly painting at least a part of the non-insulating region of the container body and the lid.

  Here, “near the boundary” means a certain area including the boundary. This constant region has a constant width in the vertical direction across the boundary, and this constant width is larger than, for example, the width of the bead portion formed by welding the container body and the lid at the boundary, Preferably, it is 1.5 times 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 a storage element of the present invention, a non-insulating region is provided near the boundary between the outer surface of the container body and the outer surface of the lid, and the container body and the lid are welded at the boundary. Then, the container is sealed, and the non-insulating region between the container body and the lid is coated with insulation. Thereby, the insulation coating of the container main body and the lid after welding can be reliably performed, and the insulation failure of the container main body and the lid can be prevented.

In this manufacturing method, the insulating coating is powder coating, and a powder coating used for the powder coating is baked by electromagnetic induction heating.

According to the method for manufacturing an electricity storage device of this embodiment, since powder coating does not use a solvent, waste liquid treatment becomes unnecessary. Moreover, by using electromagnetic induction heating, it can heat locally and does not transmit heat to the electrode body accommodated in a container main body.

Moreover, in the manufacturing method of the electrical storage element of one Embodiment, the part of the bottom side rather than the said non-continuous area | region in the said container main body before the said coating process is insulation-coated.

According to the method for manufacturing the electricity storage device of this embodiment, the bottom side of the non-continuous region in the container body before the coating process is insulated. As a result, the affinity between the insulating film coated before the coating process and the insulating film coated in the coating process is improved, and no gap is generated between these insulating films. Therefore, insulation failure can be further prevented.

In one embodiment of the method for manufacturing a power storage element, the coating step uses a masking jig that electrically isolates the non-insulating region between the container body and the lid from the non-insulating region. The non-insulating region is charged, and the powder coating is electrostatically attached to the non-insulating region, and the powder coating is subjected to electromagnetic induction heating to powder-coat the non-insulating region. .

According to the method for manufacturing the electricity storage device of this embodiment, the masking jig is electrically insulated from the non-insulating region. Therefore, when charging the non-insulating region, the masking jig is not charged. . Thus, even after the powder coating is electrostatically attached to the non-insulating region, the powder coating attached to the masking jig can be easily removed by air blow or the like. Therefore, the masking jig can be prevented from being soiled.

Further, in one storage element of the embodiment, a container body having an open mouth end, and a top Symbol lid is put on the open end of the container body member, the outer surface of the outer surface of the upper SL container body and the lid and in the vicinity of the boundary, the first insulating film provided with the insulating coating, the bottom-side portion than the first insulating film on the outer surface of the upper SL container body, provided with a second insulating film which is an insulating coating It is, between the upper Symbol first insulating film and the second insulating film, the boundary portion is formed.

In this power storage element, the insulating coating of the first insulating film is a powder coating, and the first insulating film is obtained by baking a powder paint by electromagnetic induction heating .

According to this electricity storage device, the first insulating film is provided in the vicinity of the boundary between the outer surface of the container body and the outer surface of the lid, and the bottom surface of the container body is lower than the first insulating film. There is a second insulating film on the side portion, and there is a boundary between the first insulating film and the second insulating film. Thereby, as a method for manufacturing this power storage element, for example, there is a non-insulating region near the boundary between the outer surface of the container body and the outer surface of the lid, and the container body and the lid are welded at the boundary. Then, the container is sealed, and the non-insulating region between the container body and the lid is coated with insulation. Therefore, the insulation coating of the container body and the lid after welding can be performed reliably, and the insulation failure of the container body and the lid can be prevented.

  According to the method for manufacturing a storage element of the present invention, a non-insulating region is provided near the boundary between the outer surface of the container body and the outer surface of the lid, and the container body and the lid are welded at the boundary. Then, the container is sealed, and the non-insulating region between the container body and the lid is coated with insulation. Therefore, the insulation coating of the container body and the lid after welding can be performed reliably, and the insulation failure of the container body and the lid can be prevented.

  According to the electricity storage device of this embodiment, the first insulating film is provided near the boundary between the outer surface of the container body and the outer surface of the lid, and the first insulating film is formed on the outer surface of the container body. The second insulating film is provided on the bottom side of the substrate, and there is a boundary between the first insulating film and the second insulating film. Thereby, as a method for manufacturing this power storage element, for example, there is a non-insulating region near the boundary between the outer surface of the container body and the outer surface of the lid, and the container body and the lid are welded at the boundary. Then, the container is sealed, and the non-insulating region between the container body and the lid is coated with insulation. Therefore, the insulation coating of the container body and the lid after welding can be performed reliably, and the insulation failure of the container body and the lid 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). Examples of the cutting method include laser light irradiation, press working, and cutting . 2D, the electrode body 3 fixed integrally with the lid body 11 is inserted into the container body 10, and the lid body 11 is inserted into the opening end 10b of the container body 10 as shown in FIG. 2E. Put on.

  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 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 body 10 and the lid body 11 is insulatively 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.

  According to the method for manufacturing the electricity storage device, the outer surface 10a of the container body 10 is insulatively coated, the insulating film 50 on the outer surface 10a near the open end 10b of the container body 10 is removed, and the container body 10 and the container body 10 are removed. The lid body 11 placed on the open end 10b is welded and sealed 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, in removing step, simultaneously with the removal of the insulating film 50 of the outer side surface 10a of the container main body 10, since the impurity can be removed that it was originally attached to the outer surface 10a of the container body 10, the container 1 It has the effect of preventing poor airtightness.

  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.

  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, in the post-coating process, all of the non-insulating region is insulatively painted, but the insulating tape is used only for the boundary portion of the non-insulating region, and the other part of the non-insulating region is insulatively coated. May be.

  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 above embodiment, in the pre-coating step, the entire outer surface of the container body is insulatively coated, and then the insulating film near the opening end is removed by laser light. Instead, masking is performed near the opening end. Insulating coating may be performed using Further, instead of insulating coating, insulating tape may be used.

  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 (4)

A welding step of having a non-insulated region that is not insulated in the vicinity of the boundary between the outer surface of the container body and the outer surface of the lid, and welding and sealing the container body and the lid at the boundary; ,
A coating process for insulatingly coating at least a part of the non-insulating region of the container body and the lid,
The insulating coating is powder coating, and a powder coating used in the powder coating is baked by electromagnetic induction heating. In the manufacturing method of the electrical storage element of Claim 1 ,
The method for manufacturing an electricity storage element, wherein a portion of the container body before the coating step that is on the bottom side of the non-continuous region is coated with insulation. In the manufacturing method of the electrical storage element of Claim 1 ,
In the coating step, the non-insulating region between the container body and the lid is exposed using a masking jig that is electrically insulated from the non-insulating region, and the non-insulating region is charged. A method of manufacturing an electricity storage device, comprising: electrostatically attaching a powder coating to the non-insulating region, and subjecting the powder coating to electromagnetic induction heating to powder-coat the non-insulating region. A container body having an open end;
A lid that covers the open end of the container body,
In the vicinity of the boundary between the outer surface of the container body and the outer surface of the lid, a first insulating film that is coated with insulation is provided,
A portion of the outer side of the container body on the bottom side of the first insulating film is provided with a second insulating film coated with insulation,
A boundary is formed between the first insulating film and the second insulating film,
The electric storage element according to claim 1, wherein the insulating coating of the first insulating film is powder coating, and the first insulating film is obtained by baking a powder paint by electromagnetic induction heating.

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