JP5078802B2 - Electric double layer capacitor and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical double layer capacitor which alleviates the problem wherein a separator deteriorates in a region where the separator faces a tab member, and has a structure to achieve high productivity. <P>SOLUTION: An electrical double layer capacitor comprises: a collector 124; polarizable electrode layers 126 and 128 which are made of a carbon containing porous material and are formed on both sides of the collector 124; an electrode 120 by which a tab member 130 is joined to a predetermined part of the collector 124; and a capacitor element 110 which is wound in such a condition that the electrode 120 and a separator 140 are alternatively laminated. In the tab member 130, a protective layer 136 made of carbon-containing material is formed on an opposite side of the separator 140. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric double layer capacitor and a method for manufacturing the same.

  An electric double layer capacitor is a capacitor that stores electric charges using the “electric double layer” generated at the interface between the electrode and the electrolyte as a dielectric, and since it does not involve a chemical reaction, it can be rapidly charged and discharged and has a long cycle life. It has the following features. For this reason, it can use suitably for the use of the power assist of the apparatus which requires a large electric current instantly, or energy regeneration. Further, by using it as the main power source of the rechargeable device, it is possible to realize maintenance-free of the device (for example, see Non-Patent Document 1 and Patent Documents 1 and 2).

  The electric double layer capacitor has a polarizable electrode layer made of a carbon-containing porous material formed on both sides or one side of a current collector, and an electrode body in which a tab member is joined to a predetermined portion of the current collector, a separator, Includes capacitor elements wound in an alternately stacked state.

  In an electric double layer capacitor, a capacitor element is inserted into a bottomed cylindrical metal case impregnated with an electrolytic solution, and then the metal case is wound around the sealing body to tighten the metal case. It has a structure in which the opening is sealed with a sealing body.

  For example, an aluminum thin plate is used as the current collector. As the polarizable electrode layer, for example, activated carbon powder and carbon black are kneaded with a binder (for example, polytetrafluoroethylene) to prepare a paste, and this paste is applied to both the front and back surfaces or one side of the current collector. And what was formed by drying is used.

  FIG. 14 is a diagram for explaining a conventional electric double layer capacitor 800. FIG. 14A is a perspective view when the capacitor element 810 constituting the electric double layer capacitor 800 is extended, and FIG. 14B is a partial cross-sectional view of the capacitor element 810.

  As shown in FIG. 14A, the electrode body 820 has a polarizable electrode layer removal region formed in a predetermined portion of the electrode body 820 by partially removing the polarizable electrode layer 826, and the polarizable electrode A tab member 830 made of, for example, an aluminum thin plate is joined to the layer removal region. Further, as shown in FIG. 14B, the electrode body 820 is wound in a state where the electrode body 820 is alternately stacked with the separator member 840. In FIG. 14B, the curvature of the electrode body 820 is ignored. Hereinafter, in the same drawing, it is assumed that the curvature of the electrode body is ignored.

  However, in the electric double layer capacitor 800 having the above-described structure, the separator 840 is disposed in a region facing the tab member 830 because the immersion potential of the tab member 830 is different from the immersion potential of the polarizable electrode layer 826. (For the problem that the separator deteriorates, see, for example, Patent Document 1).

  Therefore, Patent Document 2 proposes an electric double layer capacitor 900 that can solve such a problem. FIG. 15 is a diagram for explaining the electric double layer capacitor 900 described in Patent Document 2. In FIG.

  As shown in FIG. 15, the capacitor element 910 constituting the electric double layer capacitor 900 has a structure in which a polarizable electrode layer 926 is formed so as to cover the tab member 930.

  For this reason, the electric double layer capacitor 900 has a structure in which the polarizable electrode layer 926 is formed so as to cover the tab member 930, so that the problem that the separator deteriorates in a region facing the tab member is reduced. Is possible.

“Electric Double Layer Capacitor”, [online], Rubycon, [searched July 16, 2008], Internet <URL: http://www.rubycon.co.jp/catalog/j_pdfs/edlc/Outline_Jpn.pdf> JP 2007-157812 A JP 2001-237150 A

  However, in the electric double layer capacitor 900, in the process of forming the capacitor element 910, the narrow polarizable electrode layer 926 is formed so as to cover the whole of the thin electrode body 920 joined to the predetermined position of the tab member 930. Since it is necessary to carry out the process of forming (for example, application of activated carbon, application of activated carbon sheet, etc.), it is difficult to produce an electric double layer capacitor with low work efficiency and high productivity There is.

  Therefore, the present invention has been made to solve the above problems, and can reduce the problem that the separator is deteriorated in the region facing the tab member, and the electric double layer capacitor can be manufactured with high productivity. An object of the present invention is to provide an electric double layer capacitor having a structure that can be manufactured and a method for manufacturing the same.

(1) In the electric double layer capacitor of the present invention, a polarizable electrode layer made of a carbon-containing porous material is formed on both sides or one side of a current collector, and a tab member is joined to a predetermined portion of the current collector. An electric double layer capacitor comprising a capacitor element wound in a state in which the electrode body and the separator are alternately stacked, and a surface of the tab member facing the separator is made of a carbon-containing material. A layer is formed.

  For this reason, according to the electric double layer capacitor of the present invention, a protective layer is formed on the surface of the tab member facing the separator, and the protective layer further comprises a carbon-containing porous material that constitutes the polarizable electrode layer. Since it is made of a carbon-containing material that is the same quality as the material, the immersion potential of the polarizable electrode layer and the immersion potential of the protective layer are close to each other, and the problem that the separator deteriorates in the region facing the tab member can be reduced. Become.

  Further, according to the electric double layer capacitor of the present invention, since a protective layer may be formed on the tab member, the narrow polarizable electrode layer is formed by joining the tab member at a predetermined position of the narrow electrode body. It is not necessary to perform a process with low working efficiency of forming, and an electric double layer capacitor can be manufactured with high productivity.

  As a result, the electric double layer capacitor of the present invention can alleviate the problem that the separator deteriorates in the region facing the tab member, and can produce the electric double layer capacitor with high productivity. The electric double layer capacitor having the structure is achieved, and the object of the present invention is achieved.

  In the electric double layer capacitor of the present invention, the carbon-containing material refers to a carbon material or a carbon-based material, and does not include a simple organic material.

(2) In the electric double layer capacitor of the present invention, the protective layer is preferably formed on the tab member via a thin metal plate.

  By making such a configuration, the electric double layer capacitor described in the above (1) is manufactured by simultaneously joining the member having the protective layer formed on one surface of the metal thin plate and the tab member. It becomes possible to manufacture an electric double layer capacitor with high productivity.

(3) In the electric double layer capacitor of the present invention, it is preferable that the protective layer is formed on the tab member without using a metal thin plate.

  With such a configuration, if a protective layer is formed in advance on one surface of the tab member, the electric double layer described in (1) above is performed in the same process as in the case of the conventional electric double layer capacitor 800. Capacitors can be manufactured, and electric double layer capacitors can be manufactured with high productivity.

(4) In the electric double layer capacitor of the present invention, the protective layer is preferably formed by applying a carbon fine particle-containing paste on the tab member and then solidifying.

  By setting it as such a structure, it becomes possible to form a protective layer in one surface of a tab member by a comparatively simple method.

(5) In the electric double layer capacitor of the present invention, the protective layer is preferably formed by sticking a sheet made of a carbon-containing porous material on the tab member.

  Even with this configuration, the protective layer can be formed on one surface of the tab member by a relatively simple method.

(6) In the electric double layer capacitor of the present invention, the carbon-containing material is preferably made of a porous material.

  By adopting such a configuration, a protective layer made of a porous material having a large surface area is formed on the surface of the tab member facing the separator, as in the case of the polarizable electrode layer. As in the case of the described electric double layer capacitor 900, an electric double layer capacitor having a large electric capacity can be manufactured.

  In the electric double layer capacitor of the present invention, the carbon-containing material constituting the protective layer preferably has the same composition as the carbon-containing porous material constituting the polarizable electrode layer.

  With such a configuration, it is possible to reduce the potential difference between the protective layer and the polarizable electrode layer, and thus it is possible to reduce the problem that the separator is deteriorated in the region facing the tab member. .

(7) An electric double layer capacitor manufacturing method of the present invention is an electric double layer capacitor manufacturing method for manufacturing the electric double layer capacitor described in (2) above, on both or one side of the current collector. An electrode body preparation step of preparing an electrode body on which a polarizable electrode layer made of a carbon-containing porous material is formed, and a predetermined part of the electrode body by removing the polarizable electrode layer partially from the surface of the electrode body A polarizable electrode layer removal step for forming a polarizable electrode layer removal region in a portion; and the tab member, and a covering member in which the metal thin plate and the protective layer are laminated on the polarizable electrode layer removal region. A joining step of joining the tab member and the covering member to the electrode body in a disposed state, and a winding step of winding the electrode body and the separator in a state where they are alternately stacked. Including in this order And features.

  For this reason, according to the manufacturing method of the electric double layer capacitor of the present invention, the electric double layer capacitor described in the above (2) can be manufactured by a relatively simple process.

(8) An electric double layer capacitor manufacturing method of the present invention is an electric double layer capacitor manufacturing method for manufacturing the electric double layer capacitor described in (3) above, on both or one side of the current collector. An electrode body preparation step of preparing an electrode body on which a polarizable electrode layer made of a carbon-containing porous material is formed, and a predetermined part of the electrode body by removing the polarizable electrode layer partially from the surface of the electrode body In a state where a polarizable electrode layer removal step for forming a polarizable electrode layer removal region in a portion and a tab member in which a protective layer is formed on a non-joint surface are disposed in the polarizable electrode layer removal region, A joining step for joining the tab members, and a winding step for winding the electrode body and the separator in a state where they are alternately stacked, are included in this order.

  For this reason, according to the manufacturing method of the electric double layer capacitor of the present invention, the electric double layer capacitor described in the above (3) can be manufactured by a relatively simple process.

(9) In the electric double layer capacitor of the present invention, the protective layer is preferably formed by applying a carbon fine particle-containing paste onto the tab member and then solidifying.

  By setting it as such a method, it becomes possible to form a protective layer in one surface of a tab member by a comparatively simple method.

(10) In the method for producing an electric double layer capacitor of the present invention, the protective layer is preferably formed by sticking a sheet made of a carbon-containing material on the tab member.

  Even with this method, the protective layer can be formed on one surface of the tab member by a relatively simple method.

(11) In the method for producing an electric double layer capacitor of the present invention, the electrode body preparation step includes a wide electrode body in which a polarizable electrode layer made of a carbon-containing porous material is formed on both surfaces or one surface of the current collector. It is preferable to include an electrode body forming step of forming a plurality of electrode bodies by cutting the sheet into a narrow width.

  By adopting such a method, a narrow electrode body in which a polarizable electrode layer is previously formed can be formed with high productivity.

  Hereinafter, an electric double layer capacitor and a method for manufacturing the same according to the present invention will be described in detail based on embodiments shown in the drawings.

[Embodiment 1]
Embodiment 1 is an embodiment for explaining a method for manufacturing an electric double layer capacitor according to claim 2 and an electric double layer capacitor according to claim 7.

A. Configuration of Electric Double Layer Capacitor FIGS. 1 and 2 are diagrams for explaining the electric double layer capacitor 100 according to the first embodiment. FIG. 1A is a perspective view when the capacitor element 110 constituting the electric double layer capacitor 100 is extended, and FIG. 1B is a partial cross-sectional view of the capacitor element 110. FIG. ) Is an AA cross-sectional view of FIG. 2A is a partially developed perspective view of the capacitor element 110 constituting the electric double layer capacitor 800, and FIG. 2B is an exploded perspective view of the electric double layer capacitor 100. FIG.

  In the electric double layer capacitor 100 according to Embodiment 1, polarizable electrode layers 126 and 128 made of a carbon-containing porous material are formed on both surfaces of a current collector 124 as shown in FIGS. 1 and 2A. Furthermore, in a state where two electrode bodies 120 each having a tab member 130 bonded to the outside are joined to a predetermined portion of the current collector 124 and two separators 140 are alternately stacked. A protective layer 136 made of a carbon-containing porous material is formed on a surface of the tab member 130 that faces the separator 140 with a wound capacitor element 110, with a metal thin plate 134 interposed therebetween.

  As shown in FIG. 2B, the electric double layer capacitor 100 is formed by joining a pair of tab members 130 of the capacitor element 110 to a pair of connection terminals 154 attached through the sealing body 152. The element 110 and the sealing body 152 are integrated, and then the capacitor element 110 is inserted into the bottomed cylindrical metal case 150 in an impregnated state with the electrolytic solution. The metal case 150 has a structure in which the opening of the metal case 150 is sealed with a sealing body 152 by winding the metal case 150 at a portion.

  As the current collector 124, for example, an aluminum thin plate having a thickness of 20 μm to 50 μm is used. In addition, as the polarizable electrode layers 126 and 128, for example, activated carbon powder and carbon black are kneaded with a binder to prepare a carbon fine particle-containing paste, and the paste is made to have a thickness of 40 μm to 150 μm on both sides of the current collector 124. The one formed by coating and drying is used.

  As shown in FIGS. 1A and 1C, the protective layer 136 is not formed on the predetermined portion of the tab member 130, and this portion is used for electrical connection with the connection terminal 154. The

  As the tab member 130, for example, an aluminum thin plate having a thickness of 100 μm to 300 μm is used. Further, as the metal thin plate 134, for example, an aluminum thin plate having a thickness of 20 μm to 50 μm is used, and as the protective layer 136, for example, a carbon fine particle-containing paste formed by kneading activated carbon powder and carbon black with a binder is prepared. The paste is applied to a thin metal plate 134 with a thickness of 40 μm to 150 μm and then solidified.

  The carbon-containing porous material constituting the polarizable electrode layers 126 and 128 and the carbon-containing porous material constituting the protective layer 136 have the same composition.

B. Manufacturing Method of Electric Double Layer Capacitor FIG. 3 is a flowchart for explaining the manufacturing method of the electric double layer capacitor according to the first embodiment.
FIG. 4 is a perspective view schematically showing the cutting step S116 in the electrode body preparation step S110.
FIG. 5 is a perspective view schematically showing the polarizable electrode layer removing step S120. FIGS. 5A and 5B are perspective views schematically showing each stage of the polarizable electrode layer removing step S120.
FIG. 6 is a perspective view schematically showing a tab member preparation step. 6A and 6B are perspective views schematically showing each stage of the tab member forming process.
FIG. 7 is a perspective view schematically showing the covering member preparation step. FIG. 7A and FIG. 7B are perspective views schematically showing each stage of the covering member preparation process.
FIG. 8 is a cross-sectional view schematically showing the bonding step S130. FIG. 8A to FIG. 8E are cross-sectional views schematically showing each stage of the bonding step S130.

  In the method for manufacturing the electric double layer capacitor according to the first embodiment, as shown in FIG. 3, an electrode body preparation step S110, a polarizable electrode layer removal step S120, a joining step S130, and a winding step S140 are sequentially performed. Hereinafter, each of these steps will be described in detail.

1. Electrode body preparation step S110
First, a wide electrode body sheet 118 in which polarizable electrode layers 126 and 128 made of a carbon-containing porous material are formed on both surfaces of a current collector 124 made of an aluminum thin plate is prepared, and the wide electrode body sheet 118 is thinned. A plurality of electrode bodies 120 are formed by cutting to a width (see FIG. 4).

2. Polarized electrode layer removal step S120
Next, the polarizable electrode layer 126 is partially removed from the surface of the electrode body 120 to form a polarizable electrode layer removal region B in a predetermined portion of the electrode body 120 (see FIG. 5). The polarizable electrode layer removal step S120 is performed using, for example, a brush.

3. Joining step S130
Next, in the state where the tab member 130 and the covering member 132 on which the metal thin plate 134 and the protective layer 136 are overlaid are stacked in the polarizable electrode layer removal region B (FIGS. 8A to 8C). ), And the tab member 130 and the covering member 132 are joined to the electrode body 120 by using the cold welding method (see FIGS. 8D and 8E).

  In the electric double layer capacitor manufacturing method according to the first embodiment, the tab member 130 and the covering member 132 are prepared prior to performing the bonding step S130.

  As shown in FIG. 6, the tab member 130 is prepared by preparing a large area tab member sheet 130P made of an aluminum thin plate and cutting the tab member sheet 130P into a predetermined dimension.

  Further, as shown in FIG. 7, the covering member 132 is provided with a covering member 132P in which a protective layer 136P made of a carbon-containing porous material is formed on a large-area metal thin plate 134P made of an aluminum thin plate. Is cut into a predetermined dimension.

4). Winding step S140
Next, the capacitor element 110 is formed by winding the two electrode bodies 120 and the two separators 140 in a state where they are alternately stacked.

  Thereafter, the capacitor element 110 and the sealing body 152 are integrated by joining the pair of tab members 130 of the capacitor element 110 to a pair of connection terminals 154 attached through the sealing body 152, and thereafter The capacitor element 110 is inserted into the bottomed cylindrical metal case 150 in an impregnated state with the electrolytic solution, and then the metal case 150 is wound around the sealing body 152 to tighten the metal case 150. The electric double layer capacitor 100 having a structure in which the opening is sealed with the sealing body 152 is formed (see FIG. 2B).

C. Effect of Electric Double Layer Capacitor According to the electric double layer capacitor 100 according to the first embodiment, the protective layer 136 is formed on the surface of the tab member 130 facing the separator 140, and further, the protective layer 136 is separated. Since the carbon-containing porous material constituting the polar electrode layer 126 is made of the same carbon-containing material (carbon-containing porous material), the immersion potential of the polarizable electrode layer 126 and the immersion potential of the protective layer 136 are close to each other, It is possible to reduce the problem that the separator deteriorates in the region facing the tab member.

  In addition, according to the electric double layer capacitor 100 according to the first embodiment, since the protective layer 136 may be formed on the tab member 130, the narrow width is obtained by joining the tab member to a predetermined position of the narrow electrode body. It is not necessary to perform a process with low work efficiency of forming a polarizable electrode layer, and an electric double layer capacitor can be manufactured with high productivity.

  As a result, the electric double layer capacitor 100 according to the first embodiment can reduce the problem that the separator deteriorates in the region facing the tab member, and manufactures the electric double layer capacitor with high productivity. Thus, an electric double layer capacitor having a structure capable of achieving

  Further, according to the electric double layer capacitor 100 according to the first embodiment, the protective layer 136 is formed on the tab member 130 via the metal thin plate 134, so that the protective layer is formed on one surface of the metal thin plate 134. It is possible to manufacture the electric double layer capacitor by simultaneously bonding the covering member 132 and the tab member 130 that have been formed 136, and it is possible to manufacture the electric double layer capacitor with high productivity.

  Further, according to the electric double layer capacitor 100 according to the first embodiment, the surface of the tab member 130 facing the separator 140 is protected from a carbon-containing porous material having a large surface area as in the case of the polarizable electrode layer 126. Since the layer 136 is formed, an electric double layer capacitor having a large electric capacity can be manufactured as in the case of the electric double layer capacitor 900 described in Patent Document 2.

  Moreover, according to the electric double layer capacitor 100 according to the first embodiment, the carbon-containing porous material constituting the protective layer 136 has the same composition as the carbon-containing porous material constituting the polarizable electrode layer 126, and the protective layer Since the potential difference between 136 and the polarizable electrode layer 126 can be reduced, it is possible to reduce the problem that the separator deteriorates in the region facing the tab member.

  Moreover, according to the manufacturing method of the electric double layer capacitor according to the first embodiment, the electrode body preparation step, the polarizable electrode layer removal step, the joining step, and the winding step are performed in this order. The electric double layer capacitor 100 according to the first embodiment can be manufactured by a relatively simple process.

[Embodiment 2]
The second embodiment is an embodiment for explaining a method for manufacturing the electric double layer capacitor according to claim 4 and the electric double layer capacitor according to claim 9.

FIG. 9 is a diagram for explaining the electric double layer capacitor 200 according to the second embodiment. FIG. 9A is a perspective view when the capacitor element 210 constituting the electric double layer capacitor 200 is extended, and FIG. 9B is a partial cross-sectional view of the capacitor element 210. FIG. ) Is an AA cross-sectional view of FIG.
FIG. 10 is a flowchart for explaining the method for manufacturing the electric double layer capacitor according to the second embodiment.
FIG. 11 is a perspective view schematically showing a tab member preparation step. FIG. 11A to FIG. 11C are perspective views schematically showing each stage of the tab member forming process.
FIG. 12 is a cross-sectional view schematically showing the bonding step S230. 12A to 12D are cross-sectional views schematically showing each stage of the bonding step S230.

  The electric double layer capacitor 200 (not shown) according to the second embodiment has basically the same configuration as the electric double layer capacitor 100 according to the first embodiment, but the configuration of the protective layer is according to the first embodiment. This is different from the case of the electric double layer capacitor 100. That is, in the electric double layer capacitor 200 according to the second embodiment, as shown in FIGS. 9 and 11, the protective layer 236 is formed on the tab member 230 without using a metal thin plate. The protective layer 236 is formed by applying a carbon fine particle-containing paste on the tab member 230 and then solidifying.

  As described above, the electric double layer capacitor 200 according to the second embodiment is different from the electric double layer capacitor 100 according to the first embodiment in the configuration of the protective layer, but the surface of the tab member facing the separator is the protective layer. Furthermore, since the protective layer 236 is made of a carbon-containing material (carbon-containing porous material) that is the same as the carbon-containing porous material constituting the polarizable electrode layer 126, the electric power according to the first embodiment As in the case of the double layer capacitor 100, it is possible to reduce the problem that the separator deteriorates in the region facing the tab member, and to produce an electric double layer capacitor with high productivity. The electric double layer capacitor is provided.

  Further, according to the electric double layer capacitor 200 according to the second embodiment, since the protective layer 236 is formed on the tab member 230 without a metal thin plate, the protective layer is previously formed on one surface of the tab member 230. By forming this, it becomes possible to manufacture the electric double layer capacitor of the present invention in the same process as the case of the conventional electric double layer capacitor 800, and it is possible to manufacture the electric double layer capacitor with high productivity. It becomes possible.

  Furthermore, according to the electric double layer capacitor 200 according to the second embodiment, since the protective layer 236 is formed by applying a carbon fine particle-containing paste on the tab member 230 and then solidifying, one of the tab members is formed. It becomes possible to form a protective layer on this surface by a relatively simple method.

  The electric double layer capacitor 200 according to the second embodiment has the same configuration as the electric double layer capacitor 100 according to the first embodiment except for the configuration of the protective layer, and thus the electric double layer capacitor according to the first embodiment. 100 has the corresponding effect as it is.

  The electric double layer capacitor 200 according to the second embodiment can be manufactured by a method as shown in FIGS.

  The manufacturing method of the electric double layer capacitor according to the second embodiment basically includes the same steps as the manufacturing method of the electric double layer capacitor according to the first embodiment. However, as shown in FIG. Only the manufacturing method of the electric double layer capacitor according to the first embodiment is different. For this reason, in the manufacturing method of the electric double layer capacitor according to the second embodiment, only the bonding process will be described.

  That is, in the method for manufacturing the electric double layer capacitor according to the second embodiment, the protective layer 236 is formed in the polarizable electrode layer removal region B (see FIG. 12A) of the electrode body 120 prepared in advance. In a state where the tab member 230 is disposed (see FIG. 12B), the tab member 230 on which the protective layer 236 is formed is pressed strongly from above the protective layer 236 (see FIG. 12C). Is joined to the electrode body 120 (see FIG. 12D) to perform the joining step S230.

  In the electric double layer capacitor manufacturing method according to the second embodiment, the tab member 230 on which the protective layer 236 is formed is prepared prior to performing the bonding step S230.

  As shown in FIG. 11, the tab member 230 is prepared by preparing a large area tab member sheet 230P made of an aluminum thin plate, applying a carbon fine particle-containing paste 236P on a predetermined region of the tab member sheet 230P, and then solidifying the tab member sheet 230P. Thereafter, the tab member sheet 230P is produced by cutting it into a predetermined dimension.

[Embodiment 3]
Embodiment 3 is an embodiment for explaining a method for manufacturing the electric double layer capacitor according to claim 5 and the electric double layer capacitor according to claim 10.

  The electric double layer capacitor 300 (not shown) according to the third embodiment has basically the same configuration as the electric double layer capacitor 200 according to the second embodiment, but the configuration of the protective layer is according to the second embodiment. This is different from the case of the electric double layer capacitor 200. That is, in the electric double layer capacitor 300 according to the third embodiment, as shown in FIG. 12, the protective layer 336 is formed by sticking a sheet made of a carbon-containing porous material on the tab member. .

  As described above, the electric double layer capacitor 300 according to the third embodiment is different from the electric double layer capacitor 200 according to the second embodiment in the configuration of the protective layer, but the surface of the tab member facing the separator is the protective layer. Further, the protective layer 336 is made of a carbon-containing material (carbon-containing porous material) that is the same as the carbon-containing porous material constituting the polarizable electrode layer 126. Similar to the case of the double layer capacitor 200, it is possible to reduce the problem that the separator is deteriorated in the region facing the tab member, and to have a structure capable of manufacturing the electric double layer capacitor with high productivity. The electric double layer capacitor is provided.

  Further, according to the electric double layer capacitor 300 according to the third embodiment, since the protective layer 336 is formed on the tab member 330 without using a metal thin plate, the protective layer is previously formed on one surface of the tab member 330. By forming this, it becomes possible to manufacture the electric double layer capacitor of the present invention in the same process as the case of the conventional electric double layer capacitor 800, and it is possible to manufacture the electric double layer capacitor with high productivity. It becomes possible.

  Furthermore, according to the electric double layer capacitor 300 according to the third embodiment, the protective layer 336 is formed by sticking the sheet 336P made of a carbon-containing porous material on the tab member 330P. It is possible to form a protective layer on one surface of the film by a relatively simple method.

  The electric double layer capacitor 300 according to the third embodiment has the same configuration as the electric double layer capacitor 200 according to the second embodiment except for the configuration of the protective layer, and thus the electric double layer capacitor according to the second embodiment. 200 has the corresponding effect as it is.

  FIG. 13 is a perspective view schematically showing a tab member preparation step. FIG. 13A to FIG. 13C are perspective views schematically showing each stage of the tab member forming process.

  The electric double layer capacitor manufacturing method according to the third embodiment basically includes the same steps as the electric double layer capacitor manufacturing method according to the second embodiment, but a protective layer is formed as shown in FIG. Only the content of the step of manufacturing the tab member is different from the method of manufacturing the electric double layer capacitor according to the second embodiment. This “step of manufacturing the tab member on which the protective layer is formed” is a step performed prior to performing the joining step S230. For this reason, in the manufacturing method of the electric double layer capacitor according to the third embodiment, only the step of manufacturing the tab member on which the protective layer is formed will be described.

  That is, as shown in FIG. 13, the tab member 330 is prepared with a tab member sheet 330P having a large area made of an aluminum thin plate, and a sheet 336P made of a carbon-containing porous material is pasted on a predetermined region of the tab member sheet 330P. It is produced by attaching.

  As mentioned above, although the electric double layer capacitor of this invention was demonstrated based on said each embodiment, this invention is not limited to said each embodiment, In the range which does not deviate from the summary, it implements in various aspects. For example, the following modifications are possible.

(1) In each of the above embodiments, a carbon-containing porous material is used as the carbon-containing material constituting the protective layer, but the present invention is not limited to this. A non-porous material (for example, a graphite sheet) can be used. In addition, various additives can be added to the carbon-containing material in order to adjust electrical conductivity, mechanical strength, and the like.

(2) In each of the above embodiments, as the carbon-containing porous material used for the polarizable electrode layer, activated carbon powder and carbon black are kneaded with a binder (for example, polytetrafluoroethylene) to prepare a paste. Although what formed the paste by coating and drying on both front and back surfaces of the current collector was used, the present invention is not limited to this. Other porous materials containing carbon (eg, carbon nanotubes) can be used as well. In addition, various additives can be added to the carbon-containing porous material in order to adjust electric conductivity, mechanical strength, and the like.

(3) In the second embodiment, the protective layer is formed by applying a carbon fine particle-containing paste on the tab member and then solidifying. In the third embodiment, the protective layer is made of carbon. Although it is formed by sticking the sheet | seat which consists of a containing porous material on a tab member, this invention is not limited to these. For example, it may be formed by a method such as screen printing or ink jet printing.

(4) In each of the above embodiments, the cold welding method is used as a method of joining the tab member to the electrode body, but the present invention is not limited to this. For example, various methods such as ultrasonic welding, laser welding, and stitching can be applied.

(5) In Embodiment 1 described above, the tab member and the covering member have been described as being joined to the electrode body at one time, but the present invention is not limited to this. For example, the covering member may be bonded to the tab member in advance, and then the tab member to which the covering member is bonded may be further bonded to the electrode body. Further, the tab member may be joined to the electrode body, and then the covering member may be further joined on the tab member.

(6) In Embodiment 2 or 3, the protective layer is formed on the tab member in advance, and then the tab member on which the protective wall layer is formed is joined to the electrode body. The present invention is not limited to this. For example, it is possible to form a protective layer on the tab member after the tab member is joined to the electrode body. In this case, a method in which a small piece of the protective layer that has been processed into a predetermined shape in advance is attached to the tab member after being joined to the electrode body is preferable.

(7) In each of the above embodiments, the present invention has been described using an electric double layer capacitor including an electrode body in which a polarizable electrode layer made of a carbon-containing porous material is formed on both surfaces of a current collector. The invention is not limited to this. For example, the present invention can be applied to an electric double layer capacitor tab including an electrode body in which a polarizable electrode layer made of a carbon-containing porous material is formed on one side of a current collector.

It is a figure shown in order to demonstrate the electric double layer capacitor 100 concerning Embodiment 1. FIG. It is a figure shown in order to demonstrate the electric double layer capacitor 100 concerning Embodiment 1. FIG. 4 is a flowchart for explaining the method for manufacturing the electric double layer capacitor according to the first embodiment. It is a perspective view which shows typically cutting process S116 in electrode body preparation process S110. It is a perspective view which shows typically polarizable electrode layer removal process S120. It is a perspective view which shows a tab member preparation process typically. It is a perspective view which shows a covering member preparation process typically. It is sectional drawing which shows joining process S130 typically. It is a figure shown in order to demonstrate the electric double layer capacitor 200 which concerns on Embodiment 2. FIG. 6 is a flowchart shown for explaining a method for manufacturing the electric double layer capacitor according to the second embodiment. It is a perspective view which shows a tab member preparation process typically. It is sectional drawing which shows joining process S230 typically. It is a perspective view which shows a tab member preparation process typically. It is a figure shown in order to demonstrate the conventional electrical double layer capacitor 800. FIG. It is a figure shown in order to demonstrate the conventional electric double layer capacitor 900. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cutter, 20 ... Base, 110, 210, 810, 910 ... Capacitor element, 118 ... Wide electrode body sheet, 120, 820, 920 ... Electrode body, 124, 824, 924 ... Current collector, 126, 128 , 826, 828, 926, 928 ... polarizable electrode layer, 130, 230, 330, 830, 930 ... tab member, 132, 132P ... covering member, 134, 134P ... metal sheet, 136, 136P, 236, 336 ... protection Layer, 140, 840, 940 ... separator, 150 ... metal case, 152 ... sealing body, 154 ... connection terminal, 230P, 330P ... tab member sheet, 236P ... carbon fine particle-containing paste, 336P ... sheet made of carbon-containing porous material B: Polarized electrode layer removal region

Claims (11)

A polarizable electrode layer made of a carbon-containing porous material is formed on both sides or one side of the current collector, and a tab member is provided in the polarizable electrode layer removal region from which the polarizable electrode layer region is removed from the current collector. An electric double layer capacitor comprising a capacitor element wound in a state where the joined electrode body and the separator are alternately stacked,
An electric double layer capacitor, wherein a protective layer made of a carbon-containing material is formed on a surface of the tab member facing the separator. A polarizable electrode layer made of a carbon-containing porous material is formed on both sides or one side of the current collector, and electrode members in which tab members are joined to predetermined portions of the current collector and separators are alternately stacked. An electric double layer capacitor comprising a capacitor element wound in a
A protective layer made of a carbon-containing material is formed on the surface of the tab member facing the separator,
The electric double layer capacitor, wherein the protective layer is formed on the tab member through a thin metal plate. The electric double layer capacitor according to claim 1,
The electric double layer capacitor according to claim 1, wherein the protective layer is formed on the tab member without a metal thin plate. The electric double layer capacitor according to claim 3,
The electric double layer capacitor, wherein the protective layer is formed by applying a carbon fine particle-containing paste on the tab member and then solidifying. The electric double layer capacitor according to claim 3,
The protective layer is formed by adhering a sheet made of a carbon-containing material on the tab member. In the electric double layer capacitor according to any one of claims 1 to 5,
The electric double layer capacitor, wherein the carbon-containing material is made of a porous material. An electric double layer capacitor manufacturing method for manufacturing the electric double layer capacitor according to claim 2,
An electrode body preparation step of preparing an electrode body in which a polarizable electrode layer made of a carbon-containing porous material is formed on both surfaces or one surface of the current collector;
A polarizable electrode layer removal step of forming a polarizable electrode layer removal region in a predetermined portion of the electrode body by partially removing the polarizable electrode layer from the surface of the electrode body;
The tab member and the covering member are bonded to the electrode body in a state where the tab member and the covering member on which the metal thin plate and the protective layer are laminated are arranged in the polarizable electrode layer removal region. A joining process to perform,
A method of manufacturing an electric double layer capacitor comprising: a winding step of winding the electrode body and the separator in a state in which they are alternately stacked in this order. An electric double layer capacitor manufacturing method for manufacturing the electric double layer capacitor according to claim 3,
An electrode body preparation step of preparing an electrode body in which a polarizable electrode layer made of a carbon-containing porous material is formed on both surfaces or one surface of the current collector;
A polarizable electrode layer removal step of forming a polarizable electrode layer removal region in a predetermined portion of the electrode body by partially removing the polarizable electrode layer from the surface of the electrode body;
A joining step of joining the tab member to the electrode body in a state where the tab member having a protective layer formed on the non-joint surface is disposed in the polarizable electrode layer removal region,
A method of manufacturing an electric double layer capacitor comprising: a winding step of winding the electrode body and the separator in a state in which they are alternately stacked in this order. In the manufacturing method of the electric double layer capacitor according to claim 8,
The method for producing an electric double layer capacitor, wherein the protective layer is formed by applying a carbon fine particle-containing paste on the tab member and then solidifying the paste. In the manufacturing method of the electric double layer capacitor according to claim 8,
The method for manufacturing an electric double layer capacitor, wherein the protective layer is formed by sticking a sheet made of a carbon-containing material on the tab member. In the manufacturing method of the electric double layer capacitor according to any one of claims 7 to 10,
In the electrode body preparation step, a plurality of electrode bodies are formed by cutting a wide electrode body sheet in which a polarizable electrode layer made of a carbon-containing porous material is formed on both surfaces or one surface of the current collector. The manufacturing method of the electric double layer capacitor characterized by including the electrode body formation process to do.

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