JP2005327779A - Method of molding electrode plate of electric double capacitor, electrode plate molding apparatus, and method of manufacturing electric double layer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of simultaneously molding a positive plate and a negative plate and thereby to mold an electrode plate of an electric double layer capacitor capable of achieving high productivity. <P>SOLUTION: First, one side of a belt like material 22 of an electrode plate is punched out by a molding press 24, and one side of the material is notched leaving an end that becomes a tab. Then the center of the left end and the center of the notch 12b are cut by a cutter 26 (26-1, 26-2), and a positive plate 12-1 and a negative plate 12-2 having the tabs 12a on horizontally opposite positions are alternately and continuously molded of the same material 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrode plate forming method, a forming apparatus, and an electric double layer capacitor manufacturing method for an electric double layer capacitor in which electrode elements are laminated via a separator.

  An electric double layer capacitor is known as a small, large-capacity rechargeable capacitor. In an electric double layer capacitor, a rectangular plate-like electrode plate is laminated via a rectangular sheet-like separator, and is placed on one side of the electrode body. The tab is integrally formed. The electrode body is formed by, for example, adding a phenolic activated carbon to a binder solution to form a paste and thinly applying it to an aluminum foil substrate. The separator has the same shape as the outer shape of the electrode plate excluding the tab, and is made of paper or plastic. It is formed from a porous insulating sheet. Note that the anode plate and the cathode plate are made of the same material, and are only distinguished into an anode plate and a cathode plate for identification.

  The capacity of the electric double layer capacitor is determined by the number of laminated layers composed of an anode plate, a separator and a cathode plate, and a lamination operation of the anode plate, the separator and the cathode plate is required. For example, in a three-layer electric double layer capacitor, as shown in FIG. 5, separator 14+ (anode plate 12-1, separator 14, cathode plate 12-2) + separator + (anode plate, separator, cathode plate) + separator + (Anode plate, separator, cathode plate) + separator and 14 plates (3 anode plates, 7 separators, 3 cathode plates) are stacked in 13 steps.

  As can be seen from FIGS. 5 and 6, the electrode plate 12 (anode plate, cathode plate) is formed, for example, from a square unit material into a shape that leaves the tab 12 a on one side, for example, as shown by arrow 1. An anode plate 12-1 is formed by leaving the tab 12a at the right end of the upper side, and a cathode plate 12-2 is formed by leaving the tab 12a at the left end as shown by arrow 2. In addition, a large number of tabs 12a are overlapped and fixed and connected to a conductor serving as a lead terminal. The anode plate 12-1 and the cathode plate 12-2 are not formed separately, and can be shared as the cathode plate, for example, by inverting the anode plate, for example, as shown by the arrow 3.

  A conventional electrode plate forming method will be described with reference to FIG. Here, FIG. 7 is a schematic view of an electrode plate forming apparatus, (A) is a front view, and (B) is a plan view. In the conventional electrode plate forming method, the belt-shaped material 22 wound around the roll 20 is drawn in the direction of the arrow, and the material is punched out into the outer shape of the electrode plate 12 with a forming press 24 to integrally form the electrode plate ( For example, see Japanese Patent Application Laid-Open No. 2003-163140).

  In the integral molding by the molding press 24, for example, the electrode plate 12 is separated from the material 22 at the same time as the left end portion of the upper side is cut away in order to leave the tab 12a at the right end of the upper side. The board is molded. However, in order to form the electrode plate 12 with a predetermined width, idle feed is required, and not only the notch 12b but also the idle feed equivalent portion 12c is discarded, and material is wasted. Further, since the material 22 is stamped and formed into the outer shape of the electrode plate 12 by a single press process, the forming press 24 becomes large, and the electrode plate forming apparatus cannot be reduced in size.

  Since the positions of the tabs of the anode plate and the cathode plate are reversed left and right, in general, a forming press for the anode plate and a forming press for the cathode plate are prepared, and the anode plate and the cathode plate are prepared with a dedicated forming press. Each is individually molded, and the molding press and the molding process must be increased.

  Here, the anode plate and the cathode plate are not individually molded with a dedicated molding press, for example, only the anode plate is molded, and the anode plate can be reversed and used as the cathode plate. There is no increase in molding press or molding process. However, when the tabs of the cathode plate are arranged on the same side (for example, the upper side) as the tabs of the anode plate and the anode plate and the cathode plate are laminated, a reversing device for both sides is required. The electrode plate is obtained by applying a paste made of a binder and activated carbon to a thin plate-like substrate such as an aluminum foil. Since the electrode plate is a flexible body with inferior rigidity, it is difficult to reverse the front and back. Therefore, the reversing means is complicated, and the reversing process cannot be performed quickly, so that high working efficiency cannot be obtained. When the tabs are distributed on opposite sides (for example, the upper side and the lower side), a 180 ° inversion action is sufficient, and the inversion means can be prevented from becoming complicated, but the inversion means is still necessary.

  Japanese Patent No. 3095746 discloses a method of forming an electrode plate by punching and forming a tab and then cutting the electrode plate from the material with a cutter instead of punching and forming the electrode plate with a tab by a single press process. . FIG. 8 is a schematic view of an electrode plate forming apparatus for the forming method of this patent publication, wherein (A) shows a front view and (B) shows a plan view. First, the material 22 of the electrode plate wound around the roll 20 is drawn out, and the lower side of the material is punched out by the forming press 24 to form the notch 12b.

  If the punching process is repeated to form two notches 12b, the tab 12a is formed between adjacent notches. And if the raw material 22 is cut | disconnected by the cutter 26 in the position corresponded to the width | variety of the electrode plate 12, the electrode plate with the tab 12a will be shape | molded. A cutting line of the cutter 26 is shown as 26a.

  Here, if the material 22 is cut at the center of the notch 12b, the tab 12a is formed at the center of the electrode plate, and the anode plate and the cathode plate are formed without distinction. The cutting position cannot be the center of the notch, and the material is cut at a position shifted from the center.

  In this molding method in which the tab 12a is punched and then the electrode plate 12 is cut from the material 22 with the cutter 26, although the cutter is provided separately, the molding press 24 can be significantly reduced in size compared to the conventional case. The plate forming device can be remarkably miniaturized. However, even in this case, in the case where the formed electrode plate is shared as an anode plate and a cathode plate, it is a matter of course that a reversing means is required. For example, if the front and back are reversed as indicated by an arrow X so that the tabs are arranged on the same side, the reverse means is 180 °. Necessary.

  This patent publication also describes a method of simultaneously forming an anode plate and a cathode plate. In this forming method, as shown in FIG. 8C, two raw materials 22 (22-1 and 22-2) are simultaneously drawn from two rolls 20 (20-1 and 20-2), and 2 Two materials are simultaneously punched by a common molding press 24 arranged between the two materials. Also in this case, if the punching process is repeated to form two notches 12b, the tab 12a is formed between adjacent notches. Here, the position of the tab is formed on the lower side of the upper material 22-1 and on the upper side of the lower material 22-2.

  Then, if the material 22 is cut by the cutter 26 at a position corresponding to the width of the electrode plate 12, the electrode plate with the tab 12a is formed into two materials 22 (22-1 and 22-2), respectively. Here, the electrode plates 12 formed from the materials 22-1 and 22-2 have different tab positions, and one can be considered as the anode plate 12-1 and the other as the cathode plate 12-2. In the forming method, the anode plate and the cathode plate are simultaneously formed, and the electrode plate can be formed with high productivity.

  In this method of forming the anode plate and the cathode plate at the same time, although two cutters 26 are required, only one forming press 24 is required, and the electrode plate forming apparatus is not so large.

However, since two materials are drawn out and run in parallel, the running area of the material is twice as large as when one material is pulled out. From this point, it is difficult to reduce the size of the molding apparatus.
JP 2003-163140 A Japanese Patent No. 3095746

  The problem to be solved is that the anode plate and the cathode plate cannot be formed simultaneously unless two materials are drawn.

  The main feature of the present invention is that the anode plate and the cathode plate can be simultaneously formed from one material by cutting the cutter at a special position.

  According to the first aspect of the present invention, one side of the strip-shaped material of the electrode plate is punched out with a molding press, and one side of the material is cut out, leaving an end serving as a tab, and the center of the notch and the remaining end. Since the center of the plate is cut with a cutter, anode plates and cathode plates with tabs at opposite positions are formed alternately and continuously from the same material, and high productivity is achieved by simultaneous molding of the anode plate and cathode plate. can get. Since the anode plate and cathode plate are formed from the same material, the running area of the material can be minimized, one molding press is sufficient, and two cutters can be placed close to each other, so the electrode plate molding device is compact. Can be

  According to the second aspect of the present invention, by punching out one side of the strip-shaped material of the electrode plate with a molding press, the step of notching one side of the material leaving the end, the center of the notch and the remaining Cutting the center of the edge with a cutter, and having anode and cathode plates having tabs at opposite positions from the material, and forming the cathode plate alternately and continuously from the same material. High productivity can be obtained by simultaneous molding. Since the anode plate and cathode plate are formed from the same material, the running area of the material can be minimized, one molding press is sufficient, and two cutters can be placed close to each other, so the electrode plate molding device is compact. Can be

  According to the third aspect of the present invention, by forming one side of the strip-shaped material of the electrode plate, a forming press that cuts out one side of the material leaving the end, and the center of the notch and the remaining end The anode plate and cathode plate with tabs in the opposite positions are formed alternately and continuously from the same material, and high production is achieved by simultaneous forming of the anode plate and cathode plate. Sex is obtained. Also, the anode plate and cathode plate are formed from the same material, and the running area of the material can be minimized. A single molding press is sufficient, and two cutters can be placed close together, so the electrode plate molding device is compact. Can be

  According to the fourth aspect of the present invention, one side of the strip-shaped material of the electrode plate is punched out with a molding press, and one side of the material is cut out, leaving an end serving as a tab, and the center of the notch and the remaining end portion The center of the plate is cut with a cutter, and anode plates and cathode plates with tabs at opposite positions are formed alternately and continuously from the same material, and in parallel with the anode plate and cathode plate molding, The separator is cut from the material, and the separator and the anode plate and the cathode plate formed alternately from the same material are alternately transferred to the pallet to form a predetermined laminate. In this configuration, the anode plate and the cathode plate are alternately positioned at the molding stage, so that the anode plate and the cathode plate can be stacked in the order of molding through the separator, and the stacking process is simplified and high working efficiency is achieved. Is secured. Also, the anode plate and cathode plate can be transferred to the pallet with a single transfer means, and the electric double layer capacitor manufacturing apparatus can be miniaturized. Further, since the anode plate and the cathode plate are alternately positioned, the anode plate and the cathode plate can be transferred quickly and easily, and can be transferred with high work efficiency.

  According to the fifth aspect of the present invention, the separator, the anode plate, and the cathode plate are laminated after the presser plate is laid under the pallet, and the laminate is sandwiched between the upper and lower presser plates by placing the presser plate thereon. Therefore, the laminate can be transferred quickly and easily without turning over and being out of shape during the transfer.

  According to the sixth aspect of the present invention, the laminate of the pallet is transferred to the outer bag, the predetermined electrolytic solution is injected from the opening of the outer bag, and then the opening is sealed. A double layer capacitor can be easily manufactured.

  Cut one side of the strip-shaped material of the electrode plate with a molding press, and select the center of the notch and the center of the remaining end as the cutting position of the cutter after cutting out one side of the material leaving the tab end. By doing so, the simultaneous formation of the anode plate and the cathode plate from one material was realized.

  Examples of the present invention will be described in detail below. In the embodiments, the same members as those in the prior art are denoted by the same reference numerals, and the materials and the like are the same as those in the prior art and will not be described in detail. FIG. 1 is a schematic view of an electrode plate forming apparatus 10 for the electrode plate forming method of the present invention, in which (A) is a front view and (B) is a plan view. The material 22 of the electrode plate wound around the roll 20 is drawn out, and one side of the material 22 is punched by a forming press 24 to form a notch 12b. Next, the material 22 is cut by a cutter 26 with a predetermined width. Thus, the electrode plate 12 is formed.

  In the electrode plate forming method of the present invention, the cutting position of the cutter 26 is different from the conventional one, and the cutter 26 (26-1, 26-2) cuts the two places, the center of the notch 12b and the center of the remaining end portion 12a. doing. That is, the two cutters 26-1 and 26-2 are arranged to be movable up and down in front of the forming press in the drawing direction of the material 22, and the cutter 26-1 is lowered in synchronization, whereby the cutter 26-1 has the remaining portion 12a (width: t1). ), The cutter 26-2 cuts the material 20 at the center of the notch 12b (width: t2). Here, the cutters 26-1 and 26-2 are arranged apart from each other so that the interval between the cutting lines 26 a-1 and 26 a-2 becomes the width t (= t 1/2 + t 2/2) of the electrode plate 12. ing.

  As can be seen from FIG. 1B, if the material 22 is cut by the cutters 26-1 and 26-2 (under the preceding cutting leaving the cutting line 26a-1), the tabs are placed at the opposite positions. Electrode plates 12 (12-1, 12-2) having 12a are simultaneously formed. If the electrode plate 12-1 having the tab 12a at the right end of the upper side is distinguished as the anode plate and the electrode plate 12-2 having the tab at the left end of the upper side is distinguished as the cathode plate, the anode plate and the cathode plate are from the same material 20. Alternately and continuously formed. And since it is simultaneous formation of the anode plate 12-1 and the cathode plate 12-2, high production efficiency is obtained.

  Here, the length of the notch 12b punched by the molding press 24 in the present invention is twice that of the conventional simultaneous molding shown in FIG. The width t2 is substantially equal). However, the width Y of the forming press 24 is ½ that of the conventional simultaneous forming press shown in FIG. 8C, and the forming press is held to be approximately the same size as that of the conventional press. do not need. And the anode plate 12-1 and the cathode plate 12-2 are shape | molded from the same raw material 22, and the runway area of a raw material may be the minimum. Further, the two cutters 26-1 and 26-2 are separated only by the width of the electrode plate 12, and are arranged close to each other. Therefore, the electrode plate forming apparatus can be miniaturized.

  Even though one material 22 is cut at two locations, high productivity can be maintained by simultaneous cutting by the synchronous lowering of the two cutters 26-1 and 26-2.

  Next, the lamination of the electrode plate 12 and the separator 14 will be described. As shown in FIG. 2, the roll 120 around which the material 122 of the separator 14 is wound is sandwiched between the pallet (storage box) 30 and the material of the electrode plate. Located on the opposite side of the wound roll. Then, the separator 14 having a predetermined length is formed by cutting the material 122 along the cutting line 126 a with the cutter 126. Needless to say, the separator 14 has substantially the same shape as the outer shape of the electrode plate 12 excluding the tabs. In the embodiment, the electrode plate roll 20 and the separator roll 122 are arranged in a straight line with the pallet 30 in between. However, the arrangement is not limited to this. For example, the rolls 20 and 122 are arranged in a direction orthogonal to each other. Or may be arranged in parallel.

  As shown in FIG. 3A, the pallet 30 has a bottomed shape with partial wall surfaces 30a at four corners, and notches 30c are formed on the left and right sides of a rectangular bottom plate 30b. In the embodiment, the stacked body in the pallet 30 is sandwiched from above and below by the rectangular pressing plate 32.

  That is, first, the presser plate 32 is placed on the bottom plate 30 b of the pallet 30 as shown in FIG. The pallet 30 in FIG. 2 is in a state in which a holding plate 32 is placed on the bottom plate 30B, and the electrode plate 12 (anode plate 12-1, cathode plate) cut from the respective materials 22 and 122 on the holding plate. 12-2), the separator 14 is moved and laminated in a predetermined order. For example, if the separator 14, the anode plate 12-1, the separator 14, and the cathode plate 12-2 are stacked in this order, a unit stack is formed. Here, since the anode plate 12-1 and the cathode plate 12-2 are alternately positioned at the molding stage, the anode plate and the cathode plate can be laminated in the molding order through the separator 14, and the lamination process is simple. To ensure high work efficiency.

  Then, when a predetermined number of layers are obtained by stacking a predetermined number of layers in the order of the separator 14, the anode plate 12-1, the separator 14, and the cathode plate 12-2, the separator 14 is finally placed to ensure insulation. The pressing plate 32 is placed and the laminating operation is completed. In the embodiment, the one including the uppermost separator 14 is the final laminate. In addition, the form of lamination is an example. For example, the lowermost and uppermost separators 14 may be omitted.

  The separator 14, the anode plate 12-1, and the cathode plate 12-2 are transferred to the pallet 30 by, for example, an adsorption support type transfer means using a negative pressure. Since the anode plate 12-1 and the cathode plate 12-2 are alternately and continuously formed, the anode plate and the cathode plate may be transferred in the order of forming, and the transfer of the anode plate and the cathode plate is one transfer means. Therefore, the electric double layer capacitor manufacturing apparatus can be downsized. Further, since the anode plate and the cathode plate are alternately positioned, the anode plate and the cathode plate can be transferred quickly and easily, and can be transferred with high work efficiency. As shown in FIG. 4 (A), a part of the tab 12a of the anode plate 12-1 and the cathode plate 12-2 is stacked from the upper presser plate 32, so that the stacked body can be easily moved up and down Can be determined.

  One presser plate 32 is placed on each of the upper and lower sides, and notches 30c are formed on the left and right sides of the pallet bottom plate 30b. Therefore, the upper and lower presser plates can be held without being obstructed by the bottom plate. The separator 14, the anode plate 12-1, and the cathode plate 12-2 can be carried out of the pallet while being held. And since it clamps with the pressing plate 32, the separator 14, the anode plate 12-1, and the cathode plate 12-2 are taken out rapidly and easily, without producing a shape loss and a failure | damage.

  When the stacking operation is completed, the pallet 30 containing the stacked body is removed from the stacking position, an empty pallet is placed at the stacking position, and the next stacking operation is started.

  While being sandwiched between the upper and lower presser plates 32, the laminate 16 is placed in the pallet 30 and sent to the next lead terminal mounting step (FIGS. 4A to 4C). Here, since the laminate 16 is sandwiched between the upper and lower presser plates 32, the laminate 16 can be quickly and easily transferred without being turned upside down during the transfer. In the lead terminal attaching process, as shown in FIGS. 4B and 4C, first, the upper presser plate 32 is taken out from the pallet 30 together with the upper and lower presser plates 32, the upper presser plate 32 is removed, and the tab 12a is projected from the separator 14. In this state, the laminate 16 appears. And the lead terminal 13 which consists of an aluminum piece, a copper piece etc. is each inserted between the overlapped left and right tab 12a, and a lead terminal and a tab are integrated by ultrasonic welding.

  Then, for example, the laminated body 16 is placed on the unfolded outer bag 34 and folded to form the outer bag. Then, the outer bag 34 is sealed by thermocompression leaving one end to be an opening, and after the injection of the electrolyte, the opening is also sealed to form the sealing edges 34a on the four sides to completely seal the outer bag. As a result, the electric double layer capacitor 40 as a final product with lead terminals protruding from the laminated body 16 encapsulated in is obtained.

  The above-described embodiments are for explaining the present invention, and do not limit the present invention. All modifications, alterations, and the like within the technical scope of the present invention are included in the present invention. It goes without saying that it is done. For example, the lead terminal attachment process and the electrolyte solution injection process of the embodiment are examples, and are not limited to those of the embodiment. Contrary to the embodiment, the lead terminal may be attached to the tab 12a after the electrolyte solution is injected into the laminate 16 and the outer bag 34 is sealed.

  Although it is suitable for molding in an electric double layer capacitor, the present invention can be widely applied to molding of various parts integrally provided with tabs at opposite positions.

It is a schematic diagram of the apparatus (electrode plate shaping | molding apparatus) for the shaping | molding method of the electrode plate of the electric double layer capacitor which concerns on one Example of this invention, (A) is a front view, (B) shows a top view. It is a schematic diagram of the apparatus which laminates | stacks an electrode plate (anode plate, cathode plate) and a separator alternately, and (A) shows a front view, (B) shows a top view. It is a top view which shows one form of a pallet and a press plate, (A) is a plan view of a pallet, (B) is a plan view of a press plate, and (C) is a plan view of a pallet in which a press plate is incorporated. (A)-(E) show process drawing which manufactures an electric double layer capacitor from a layered product. It is a schematic diagram of a lamination process of a separator, an anode plate, and a cathode plate in a three-layer electric double layer capacitor. It is a schematic diagram which shows the shaping | molding process of an electrode plate (anode plate, cathode plate). It is a schematic diagram of the conventional electrode plate shaping | molding apparatus which stamps a raw material with a shaping press and integrally forms an electrode plate, (A) is a front view, (B) shows a top view. It is a schematic diagram of the conventional electrode plate shaping | molding apparatus which simultaneously shape | molds an anode plate and a cathode plate from a raw material with a shaping press and a cutter, (A) is a front view, (B) is a top view, (C) is an anode plate, a cathode The top view in the simultaneous shaping | molding of a board is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrode plate molding apparatus 12 Electrode plate 12-1 Anode plate 12-2 Cathode plate 12a Tab 12b Notch 13 Lead terminal 14 Separator 16 Laminate
20, 120 Rolls (wound material) 22, 122 Electrode plate, separator material 24 Molding press 26 (26-1, 26-2), 126 cutter 26a1-1, 26a-2, 126a Cutting line t of cutter t Electrode plate width t1 Tab width t2 Notch width 30 Pallet 32 Presser plate 34 Exterior bag 34a Seal edge of exterior bag 40 Electric double layer capacitor

Claims (6)

In an electrode plate molding method in an electric double layer capacitor formed by laminating an anode plate with a tab made of an electrode plate through a separator and a cathode plate,
One side of the strip-shaped material of the electrode plate is punched out with a molding press, and one side of the material is cut out leaving the end to be a tab,
The center of the notch and the center of the remaining end are cut with a cutter, and anode plates and cathode plates having tabs at opposite positions are formed alternately and continuously from the same material. Electrode plate forming method for double layer capacitor. In an electrode plate molding method in an electric double layer capacitor formed by laminating an anode plate made of an electrode plate via a separator and a cathode plate,
A step of notching one side of the material leaving an end by punching one side of the strip-shaped material of the electrode plate with a molding press;
Cutting the center of the notch and the center of the remaining end with a cutter, and forming the anode plate having a tab at a position opposite to the left and right from the material, and forming the cathode plate alternately and continuously from the same material;
An electrode plate forming method for an electric double layer capacitor, comprising: In an electrode plate forming apparatus for an electric double layer capacitor for forming an anode plate laminated via a separator, an electrode plate with a tab to be a cathode plate,
By punching out one side of the strip-shaped material of the electrode plate, a molding press that cuts out one side of the material, leaving the end,
A cutter that cuts the center of the notch and the center of the remaining end,
An apparatus for forming an electrode plate for an electric double layer capacitor. A laminated body is formed by laminating an anode plate with a tab made of an electrode plate and a cathode plate through a separator, and a lead terminal is attached to the tab, and the laminated body is infiltrated with an electrolytic solution and sealed in an outer bag. In the manufacturing method of the electric double layer capacitor,
One side of the strip-shaped material of the electrode plate is punched out with a molding press, and one side of the material is cut out leaving the end to be a tab,
Cut the center of the notch and the center of the remaining end with a cutter, and alternately and continuously form anode plates and cathode plates with tabs at the opposite positions from the same material,
In parallel with the molding of the anode plate and cathode plate, the separator is cut from the strip material,
A method for producing an electric double layer capacitor, wherein separators, anode plates and cathode plates alternately formed from the same material are alternately transferred to a pallet to form a predetermined laminate. 5. The electric double layer capacitor as claimed in claim 4, wherein a separator, an anode plate and a cathode plate are stacked after a press plate is laid under the pallet, and the press plate is placed on the laminate and the laminate is sandwiched between the upper and lower press plates. Method. Transfer the pallet stack to the outer bag,
6. The method for producing an electric double layer capacitor according to claim 4, wherein the opening is sealed after a predetermined electrolyte is injected from the opening of the outer bag.

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