JP4928722B2 - Electric double layer capacitor manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to an electric double layer capacitor manufacturing method and a manufacturing apparatus.

  2. Description of the Related Art In recent years, attention has been focused on application technologies for electric double layer capacitors that can be rapidly charged and have a long charge / discharge cycle life as various power storage devices.

An electric double layer capacitor has a certain number of positive and negative electrode bodies stacked alternately with a separator interposed therebetween, and each positive electrode body and a part of each negative electrode body are used as lead portions, Each is joined to a terminal (aluminum electrode). This laminated body is immersed in an electrolytic solution and accommodated in a container in a state in which terminals are projected to the outside (for example, Patent Document 1).
JP2002-280271

  In such an electric double layer capacitor, since the container is sealed with a pair of terminals protruding to the outside, the container is made of a laminated film (for example, aluminum laminate) having a laminated structure including a metal intermediate layer on a resin film. Make and seal with heat seal etc.

  However, when the container is formed in a bag shape, it is difficult to put the laminate. Since the container has a size with almost no gap with respect to the laminated body, it is difficult to insert the laminated body, and the laminated body may be displaced during insertion.

  Therefore, it is considered to make the container into a half structure (divided structure). In this case, except for the portion where the pair of terminals protrudes, one pack and the other pack are joined together. There is a problem when the flange portion is thermally welded.

  The thermal welding of the mating flange part of both packs is performed by sandwiching both flange parts between the seal base part of the base of the sealing device and the seal top part having the head heating function, and then pressing and heating. When the laminated body is accommodated in this case, the surface contact of the both flange portions becomes non-uniform, and the thermal welding may vary. If there is variation in thermal welding, the sealing strength will be insufficient.

  The present invention has been made paying attention to such a problem, and an object thereof is to improve the manufacturability of an electric double layer capacitor.

In the first invention, a certain number of positive electrode bodies and negative electrode bodies are alternately stacked with separators interposed therebetween, and a plurality of layers of the same polarity are provided with each positive electrode body and a part of each negative electrode body as a lead portion. In the method of manufacturing an electric double layer capacitor in which the laminated body in which each of the terminals is bonded to the terminal is accommodated in the container with the terminal projecting to the outside, the container is divided into a first pack having a divided structure in the laminating direction of the laminated body. And the second pack, the first pack and the second pack are formed by providing a metal intermediate layer between the resin films, and the periphery of the opening excluding the protruding top edge of the terminal A joint flange portion for joining each other is formed, and a seal device having a heating function is formed on the seal top portion of the head, and the joint flange portion of the first pack is attached to the Teflon (registered trademark) of the base of the seal device. Predetermined thickness made of resin Placing the sealing base portion that is coated with a cushion sheet, the sets laminate accommodating portion of the first pack, if the second pack accommodating portion of the second pack fit laminate formed by said set The flange portion is aligned with the mating flange portion of the first pack, and in this state, the head of the seal device is heated between the base of the seal device and the seal base portion coated with a cushion sheet made of Teflon resin. A seal top portion having a function is applied to the mating flange portion of the second pack, and is pressed against the mating flange portion of the first pack and heated to thermally weld the mating flange portions of the first and second packs. Characterized by

According to a second aspect of the present invention, in the first aspect, the opening surfaces of the first and second packs are formed in a square shape, and the joint flange portions of the first and second packs are formed on the top edge portions of the terminals protruding. The seal top part formed continuously on the three sides around the opening excluding one side, the base of the sealing device, coated with a cushion sheet made of Teflon resin, and the sealing top portion having a heating function of the head of the sealing device , The first and second packs are formed in a U shape in accordance with the shape of the joint flange portion.

According to a third invention, in the first invention or the second invention, the protrusion width of the joint flange portion of the first and second packs is coated with a cushion sheet made of Teflon resin at the base of the sealing device. It is characterized in that it is larger than the width of the seal top portion having the heating function of the seal base portion and the head of the seal device .

According to a fourth aspect of the present invention, there is provided a container formed by providing a metal intermediate layer between resin films, and a certain number of positive electrode bodies and negative electrode bodies are alternately stacked with a separator interposed therebetween, and each positive electrode In a manufacturing apparatus of an electric double layer capacitor in which a laminated body in which a multilayered portion of the same polarity is joined to a terminal using a part of the body and a part of each negative electrode body as a lead portion is accommodated in a container with the terminal protruding to the outside, A base of a sealing device that forms a sealing base portion that receives a mating flange portion of the first pack of the divided structure of the container, and a mating flange of the first pack that contacts the mating flange portion of the second pack of the same divided structure And a head of a sealing device that forms a seal top portion that heats the mating flange portions of the first and second packs by press-contacting to the portion, and the sealing device is provided on the seal top portion of the head. Heating machine It is those having, characterized in that are coated with a cushion sheet having a predetermined thickness made of Teflon (registered trademark) resin to the sealing base portion.

In the first and second inventions, the surface contact of the both flange portions of the first and second packs is uniform, the heat welding of the flanges can be performed without variation, and an appropriate joining width can be secured, and the sealing strength Can be improved. Further, by using Teflon resin for the cushion sheet, it is difficult for heat to be taken away by the seal base, so that the seal temperature is stable, heat welding can be performed properly, and high sealing strength can be secured.

  In the third invention, the melted material melted from the resin film is not fused to the seal base part and the seal top part outside part of the joint flange part, and does not protrude from the joint flange part. Can be welded properly.

  In the fourth aspect of the invention, workability can be improved and stable quality of the capacitor container can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of an electric double layer capacitor, wherein 10 is a capacitor body (laminated body), 20 is a divided structure of a first pack 21 and a second pack 22 in the stacking direction of the capacitor body 10. A container.

  The capacitor body 10 is alternately laminated with a certain number of positive and negative electrode bodies with a separator interposed therebetween. As shown in FIG. 2, the collector electrode 11a of the positive electrode body and the collector electrode 11b of the negative electrode body are formed by punching an aluminum foil, and a pair of activated carbon electrodes and separators (illustrated) are provided between the collector electrodes 11a and 11b. Not).

  Lead portions 12a and 12b are provided on one side of a rectangular flat surface of the positive electrode collector electrode 11a and the negative electrode collector electrode 11b, and terminal plates 13a and 13b ( Aluminum electrode) is joined. The terminal plates 13a and 13b and the lead portions 12a and 12b are joined by ultrasonic welding, spot welding, or the like so as to ensure good electrical conductivity and not damage the lead portions 12a and 12b of the aluminum foil. .

  The first pack 21 and the second pack 22 of the container 20 are made of a laminated film (for example, a polyethylene layer, a nylon layer, an aluminum layer, a nylon layer, etc.) having a metal intermediate layer (aluminum layer) between resin films. An aluminum laminate sheet is used.

  The first pack 21 is provided with a concave portion 23 of a predetermined depth in a square shape so as to cover the capacitor body 10 from one laminated surface side, and a terminal edge is formed on the top edge portion from which the terminal plates 13a and 13b protrude. The flange portion 24 is formed continuously with the flange portion 25 at three sides around the opening excluding the top edge portion.

  The second pack 22 is provided with a concave portion 26 having a predetermined depth in a square shape so as to cover the capacitor body 10 from the opposite side of the first pack 21, and at the top edge portion where the terminal plates 13 a and 13 b protrude. In the terminal flange portion 27, a joint flange portion 28 is continuously formed at three sides around the opening excluding the top edge portion.

  The depth of the concave portion 23 of the first pack 21 and the depth of the concave portion 26 of the second pack 22 are formed such that the sum of these is substantially equal to the laminated thickness of the laminated portion 15 of the capacitor body 10. The

  Further, the projecting widths of the joint flange portions 25 and 28 of the first and second packs 21 and 22 are formed to be a predetermined width larger than the widths of the seal base portion 46 and the seal top portion 51 of the seal device 40 described later.

  And the lamination | stacking part 15 of the capacitor main body 10 is accommodated in the recessed part 23 of the 1st pack 21, and the recessed part 26 of the 2nd pack 22, and the joint flange parts 25 and 28 are heat-welded.

  3 (a) and 3 (b) show the sealing device 40 for thermally welding the joint flange portions 25 and 28 of the first and second packs 21 and 22, and FIGS. 4 (a) to 4 (c) show the sealing device 40. FIGS. 5A to 5D show a sealing device head 44 attached to the elevating unit 43 of the sealing device 40. FIG.

  The base 42 is formed with a positioning base 45 that receives the back surface of the recess 23 of the first pack 21 and positions the first pack 21, and a seal base 46 that receives the flange portion 25 of the first pack 21. Has been.

  The seal pedestal 46 protrudes from the reference surface of the base 42 and is formed in a U shape in accordance with the joint flange 25 on the three sides around the opening of the first pack 21, and a Teflon ( A cushion sheet 47 of a predetermined thickness (for example, several mm) made of a registered trademark (polytetrafluoroethylene) resin or the like is coated.

  A guide pin (not shown) for positioning the joint flange portions 25 and 28 of the first and second packs 21 and 22 formed of Teflon resin or the like is erected around the seal base portion 46 of the base 42. The

  A clamp 48 for holding the terminal plates 13 a and 13 b of the capacitor body 10 is provided on one end side of the base 42.

  The head 44 presses the concave portion 50 that surrounds the back surface of the concave portion 26 of the second pack 22 and the mating flange portion 28 of the second pack 22 to the mating flange portion 25 of the first pack 21 and has a heater function. A seal top portion 51 is formed.

  The seal top portion 51 protrudes downward from the reference surface of the head 44, is formed in a U shape in accordance with the seal base portion 46 of the base 42, and has a heater (not shown) embedded therein.

  When heat-welding the mating flange portion 25 of the first pack 21 and the mating flange portion 28 of the second pack 22, the rear surface portion of the recess 23 of the first pack 21 is aligned with the positioning base 45 of the base 42, The flange portion 25 of the first pack 21 is placed on the seal base portion 46.

  Next, the stacked portion 15 of the capacitor body 10 is accommodated in the recess 23 of the first pack 21. The terminal plates 13 a and 13 b are positioned on the terminal flange portion 24 of the first pack 21.

  Next, the concave portion 26 of the second pack 22 is aligned with the stacked portion 15 of the capacitor body 10, and the mating flange portion 28 of the second pack 22 is overlapped with the mating flange portion 25 of the first pack 21.

  Then, the base 42 is moved to the sealing position, the head 44 is lowered, the seal top portion 51 is applied to the mating flange portion 28 of the second pack 22, and the mating flange portion of the first pack 21 with a predetermined force. 25 and heated for a predetermined short time.

  Thereby, the joint flange parts 25 and 28 of the 1st, 2nd packs 21 and 22 are heat-welded.

  Thus, since it heat-seal | fuses, the favorable joining state of the joint flange parts 25 and 28 of the 1st, 2nd packs 21 and 22 is securable.

  Since the cushion seat 47 is coated on the seal base portion 46 of the base 42 that receives the flange portions 25 and 28 of the first and second packs 21 and 22, The surface contact is uniform, so that the heat welding of the flange by heating can be performed without variation, and an appropriate bonding width can be secured and the seal strength can be improved.

  By using Teflon resin or the like for the cushion sheet 47, it becomes difficult for heat to be taken away by the seal base portion 46, so that the seal temperature is stabilized, heat welding can be performed properly, and high sealing strength can be secured.

  Further, by coating the sealing base 46 with Teflon resin or the like, a melted material melted from the resin films of the first and second packs 21 and 22 (if an adhesive is used for bonding, the adhesive is Does not adhere to the seal base 46. Therefore, workability can be improved.

  Melting melted from the resin film by forming the projecting width of the joint flange portions 25 and 28 of the first and second packs 21 and 22 larger than the width of the seal base portion 46 and the seal top portion 51. The object is fused to the flange portions 25 and 28 in the outer portion of the seal base portion 46 and the seal top portion 51. Therefore, the molten product does not protrude from the joint flange portions 25 and 28, and the joint flange portions 25 and 28 can be appropriately welded.

  Further, guide pins for positioning the mating flange portions 25 and 28 of the first and second packs 21 and 22 are erected around the seal base portion 46, and the guide pins are formed of Teflon resin or the like. Therefore, there is no case where the melted material melted from the resin film adheres to the guide pins and impairs positioning.

  Therefore, workability can be improved and stable quality of the capacitor container 20 can be ensured.

  After the formation of the container 20, the laminated portion 15 is immersed in an electrolytic solution, and the terminal flange portion 24 around the terminal plates 13a and 13b is welded by heat sealing while the inside of the container 20 is evacuated (for heat sealing). Use a welding agent) and seal.

It is a decomposition | disassembly block diagram of a capacitor. It is a structure explanatory view of a capacitor main part. It is a front view of a sealing device. It is a side view of a sealing device. It is a top view of the base of a sealing device. It is a front side view of the base of a sealing device. It is a left view of the base of a sealing device. It is a top view of the head of a sealing device. It is a front side view of the head of a sealing device. It is a rear side view of the head of a sealing device. It is a right view of the head of a sealing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Capacitor main body 11a, 11b Collecting electrode 12a, 12b Lead part 13a, 13b Terminal board 15 Lamination | stacking part 20 Container 21 1st pack 22 2nd pack 23 Concave part 25 Flange part 26 Concave part 28 Flange part 40 Sealing device 42 Base 44 Head 46 Seal base 47 Cushion sheet 51 Seal top

Claims (4)

A certain number of positive electrode bodies and negative electrode bodies were alternately stacked with separators interposed therebetween, and each positive electrode body and a part of each negative electrode body were used as lead portions, and the multilayer portions of the same polarity were joined to the terminals, respectively. In the manufacturing method of the electric double layer capacitor in which the multilayer body is accommodated in the container with the terminal protruding to the outside,
The container is constituted by a first pack and a second pack having a split structure in the stacking direction of the stacked body,
The first pack and the second pack are formed by providing a metal intermediate layer between the resin films, and a joint flange portion for joining each other around the opening excluding the projecting top edge portion of the terminal. Forming,
Using a sealing device having a heating function on the seal top portion of the head, the flange portion of the first pack is coated with a cushion sheet of a predetermined thickness made of Teflon (registered trademark) resin on the base of the sealing device. Put it on a certain seal stand,
Set the laminate to the accommodation site of the first pack,
Aligning the accommodation part of the second pack with the set laminate, the fitting flange part of the second pack is matched with the fitting flange part of the first pack,
In this state, the seal top portion having the heating function of the head of the seal device is connected to the flange of the second pack between the base of the seal device and the seal base portion coated with the cushion sheet made of Teflon resin. A method of manufacturing an electric double layer capacitor, wherein the method is to heat the welded flange portions of the first and second packs by heat-contacting with the flanged portions of the first pack and heating them.   The opening surfaces of the first and second packs are formed in a square shape, and the joint flange portions of the first and second packs are formed continuously on the three sides around the opening except for one side of the protruding top edge portion of the terminal. The seal base portion of the base of the seal device, which is coated with a cushion sheet made of Teflon resin, and the seal top portion having a heating function of the head of the seal device are the flange portions of the first and second packs. The method for manufacturing an electric double layer capacitor according to claim 1, wherein the electric double layer capacitor is formed in a U shape according to the shape.   A sealing top having a heating function of a sealing base portion coated with a cushion sheet made of Teflon resin and a head of the sealing device, with a projecting width of a joint flange portion of the first and second packs. 3. The method of manufacturing an electric double layer capacitor according to claim 1, wherein the width is larger than a width of the portion. A container formed by providing a metal intermediate layer between resin films, and a certain number of positive electrode bodies and negative electrode bodies are alternately laminated with a separator interposed therebetween, In an apparatus for manufacturing an electric double layer capacitor in which a laminated body in which multiple layers of the same polarity are joined to a terminal as a lead part is accommodated in a container with the terminal protruding to the outside,
A base of a sealing device in which a sealing base portion for receiving a mating flange portion of the first pack of the divided structure of the container is formed;
Similarly, a seal top portion is applied to the fitting flange portion of the second pack having the divided structure, and is pressed against the fitting flange portion of the first pack and heated to thermally weld the fitting flange portions of the first and second packs. A head of the formed sealing device, and the sealing device has a heating function at the seal top portion of the head,
An apparatus for manufacturing an electric double layer capacitor, wherein a cushion sheet having a predetermined thickness made of Teflon (registered trademark) resin is coated on the seal base.

Images