JP5128053B2 - Capacitor electrode foil manufacturing method, capacitor electrode foil, multilayer electrolytic capacitor, and wound electrolytic capacitor - Google Patents

Description

  The present invention relates to a method for manufacturing a capacitor electrode foil, a method for manufacturing a capacitor anode foil, a capacitor electrode foil, a capacitor anode foil, a multilayer electrolytic capacitor, and a wound electrolytic capacitor.

  In conventional electrolytic capacitors, terminal members (internal terminals and external terminals) are electrically connected to the current collectors of electrode foils (ie, anode foil and cathode foil) by various means. For example, when the capacitor is a wound electrolytic capacitor, mechanical fastening such as caulking and riveting is mainly used as a means for coupling the terminal member to the current collector, and the capacitor is a multilayer solid electrolytic capacitor. In this case, welding such as laser welding, ultrasonic welding, spot welding, etc. is used as a means for coupling the terminal member to the current collecting portion.

  By the way, in recent years, a capacitor having a low equivalent series resistance (hereinafter referred to as “ESR”) has been demanded along with improvement in performance of electric equipment. In order to satisfy this requirement, it is desirable that the electrical connection resistance between the current collector and the terminal member be as small as possible.

  However, in general, in an electrolytic capacitor, an etching layer (etching pit layer) generated by an etching process and an oxide film layer generated by a chemical conversion process are formed on the front and back surfaces of the current collector of the electrode foil. When a terminal member is connected to the current collector, there is a problem that the electrical connection resistance increases.

Therefore, in order to eliminate this difficulty, a method of reducing the connection resistance by evaporating metal particles on the current collector and a method of reducing the connection resistance by roughening the current collector have been proposed ( For example, see Patent Documents 1 and 2.)
JP 2001-244144 A (Claim 1, FIG. 2) JP 2001-203127 A (Claim 1, FIG. 1)

  However, according to the former method of the two methods described above, there is a possibility that the deposited film may be peeled off unintentionally. According to the latter method, it is difficult to set the surface roughness to a predetermined value. Therefore, it has been difficult to reliably reduce the connection resistance in either of the two methods described above.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide an electrode foil for a capacitor that can reliably reduce an electrical connection resistance between a current collector of the electrode foil and a terminal member. Manufacturing method and manufacturing method of anode foil for capacitor, capacitor electrode foil and capacitor anode foil obtained thereby, multilayer electrolytic capacitor and winding electrolytic capacitor using this electrode foil (anode foil), Is to provide.

  The present invention provides the following means.

  [1] In a method of manufacturing a capacitor electrode foil, comprising a power storage unit and a current collector to which a terminal member is electrically connected, the surface and the back surface of at least one side edge of the strip-shaped electrode foil material, A masking step of continuously masking the electrode foil material along the side edge with a predetermined width, and performing an etching process on the non-masking portion of the electrode foil material in a masked state, thereby removing the non-masking portion of the electrode foil material from the power storage unit. And after the etching step, removing the masking agent of the masking portion of the electrode foil material, thereby removing the masking agent removing portion of the electrode foil material as a current collecting portion, and The manufacturing method of the electrode foil for capacitors characterized by including this.

  [2] In the etching step, a large number of non-penetrating etching pits extending in the depth direction from the front surface and the back surface are formed in the non-masking portion of the electrode foil material, and the thickness direction center portion of the non-masking portion is formed. 2. The method for producing an electrode foil for a capacitor as described in 1 above, wherein the non-masking part is subjected to an etching treatment so that the base metal part remains.

  [3] In the masking step, the front and back surfaces of both side edge portions of the electrode foil material are continuously masked with a predetermined width along each side edge, and after the etching step, 3. The method for producing an electrode foil for a capacitor according to item 1 or 2, further comprising a cutting step of cutting the power storage unit of the electrode foil material in a zigzag shape in the length direction of the electrode foil material.

  [4] In the method for manufacturing a capacitor anode foil, which includes a power storage unit and a current collector unit to which a terminal member is electrically connected, at least one side edge portion of the strip-shaped anode foil material is separated from the front and back surfaces. A masking step of continuously masking with a predetermined width along each side edge, and an unmasking portion of the anode foil material by performing an etching process on the nonmasking portion of the anode foil material in a masked state. An etching process with a power storage part, a chemical conversion process for performing chemical conversion treatment on the power storage part of the anode foil material in a masked state after the etching process, and a masking of the anode foil material after the chemical conversion process And a masking agent removing step in which the masking agent removing part of the anode foil material is used as a current collecting part by removing the masking agent in the part. Manufacturing method of the anode foil.

  [5] In the etching step, a large number of non-penetrating etching pits extending in the depth direction from the front surface and the back surface are formed in the non-masking portion of the anode foil material, and at the central portion in the thickness direction of the non-masking portion. 5. The method for producing an anode foil for a capacitor as described in 4 above, wherein the non-masking portion is subjected to an etching treatment so that the base metal portion remains.

  [6] In the masking step, the front and back surfaces of both side edges of the anode foil material are continuously masked with a predetermined width along each side edge, and after the chemical conversion step, 6. The method for producing an anode foil for a capacitor as described in 4 or 5 above, comprising a cutting step of cutting the electricity storage section of the anode foil material in a zigzag shape in the length direction of the anode foil material.

  [7] A capacitor electrode foil obtained by the method for manufacturing a capacitor electrode foil according to any one of items 1 to 3.

  [8] An anode foil for capacitors obtained by the method for producing an anode foil for capacitors according to any one of 4 to 6 above.

  [9] The electrode foil obtained by the method for producing an electrode foil for a capacitor according to any one of items 1 to 3 is used as the cathode foil, and the electrode foil according to any one of items 4 to 6 is used as the anode foil. A multilayer electrolytic capacitor characterized in that an anode foil obtained by the method for producing an anode foil for a capacitor is used.

  [10] As the cathode foil, the electrode foil obtained by the method for producing a capacitor electrode foil described in the preceding paragraph 1 or 2 is used, and as the anode foil, obtained by the method for producing an anode foil for a capacitor described in the preceding paragraph 4 or 5. A wound electrolytic capacitor characterized in that an anode foil is used.

  [11] Anode foil having an anode power storage unit and a strip-shaped anode current collector to which the anode terminal member is electrically connected, and a strip-shaped cathode to which the cathode power storage unit and the cathode terminal member are electrically connected A cathode foil having a current collector, and a strip-shaped separator, the anode power storage unit of the anode foil is composed of a plurality of anode unit power storage units, on the front and back surfaces of the anode unit power storage unit, Both have been subjected to etching treatment and chemical conversion treatment, and both the front surface and the back surface of the anode current collector are subjected to etching treatment and chemical conversion treatment over the entire length direction of the anode current collector. The anode current collector unit is not provided with the plurality of anode unit power storage units projecting to one side of the anode current collector unit and at a predetermined interval in the length direction of the anode current collector unit. The anode current collector is connected to each anode unit storage unit. A plurality of first anode unit current collectors connected in series, and a second anode unit current collector located between two adjacent first anode unit current collectors, The cathode power storage unit of the cathode foil is composed of a plurality of cathode unit power storage units, and both the front and back surfaces of the cathode unit power storage unit are subjected to an etching process, while being subjected to a chemical conversion process. In addition, neither the front surface nor the back surface of the cathode current collector is subjected to an etching process or a chemical conversion treatment over the entire area in the length direction of the cathode current collector. The plurality of cathode unit power storage units are connected to each other at a predetermined interval in a length direction of the cathode current collector in a mode protruding to one side of the cathode current collector. The current collector is adjacent to a plurality of first cathode unit current collectors connected to each cathode unit power storage unit. A second cathode unit current collector disposed between two matching first cathode unit current collectors, and the anode current collectors of the anode foil are adjacent to each other. The second anode unit current collector is interposed between anode unit current collectors, and the plurality of anode unit power storage units are folded in a zigzag manner so as to be substantially parallel to each other, whereby the first anode unit current collector is And the second anode unit current collector are sequentially stacked, and the cathode current collector of the cathode foil is disposed between the two adjacent first cathode unit current collectors. The first cathode unit current collector is folded in a zigzag manner so that the cathode unit power storage units are interposed one by one between the two anode unit power storage units adjacent to each other and having a current collector unit interposed therebetween. And the second cathode unit current collector are sequentially stacked. The separator is folded in a zigzag manner so that a part of the separator is interposed between the anode unit storage unit and the cathode unit storage unit adjacent to each other, and the anode current collector unit of the anode foil A multilayer electrolytic capacitor, wherein an anode terminal member is electrically connected, and the cathode terminal member is electrically connected to a cathode current collector of the cathode foil.

  [12] In the anode current collector portion of the anode foil, the first anode unit current collector portion and the second anode unit current collector portion are joined together in a sequentially laminated state, and the cathode foil cathode 12. The multilayer electrolytic capacitor according to 11 above, wherein in the current collector, the first cathode unit current collector and the second cathode unit current collector are joined together in a sequentially laminated state.

  [13] In the anode power storage unit of the anode foil, a large number of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface of the anode unit power storage unit are formed in the anode unit power storage unit. The etching process in which a metal base part remains in the thickness direction central part of the unit power storage unit, and in the cathode power storage unit of the cathode foil, the cathode unit power storage unit extends in the depth direction from the front surface and the back surface, respectively. 13. The multilayer electrolytic capacitor as described in 11 or 12 above, wherein a large number of non-penetrating etching pits are formed and a bare metal part remains in the central part in the thickness direction of the cathode unit power storage part.

  [14] In a wound electrolytic capacitor in which a strip-shaped anode foil and a strip-shaped cathode foil are wound with a strip-shaped separator interposed therebetween, an anode terminal is provided at one side edge of the anode foil. An anode current collector to which the members are electrically connected is provided continuously with a predetermined width along the side edge, and a portion on the other side of the anode foil from the anode current collector is the anode power storage unit. The surface and back surface of the anode power storage unit are both subjected to etching treatment and chemical conversion treatment, and the surface and back surface of the anode current collector are both subjected to etching treatment and chemical conversion treatment. The cathode current collector is not applied over the entire length of the anode current collector, and a cathode current collector to which a cathode terminal member is electrically connected is provided on one side edge of the cathode foil. From the cathode current collector of the cathode foil. The portion on the other side edge is a cathode power storage unit, and the surface and the back surface of the cathode power storage unit are both subjected to etching treatment, but not subjected to chemical conversion treatment, and the surface of the cathode current collector unit Neither the etching process nor the chemical conversion treatment is applied to the entire area in the length direction of the cathode current collector, and a part of the anode current collector of the anode foil is cut and raised. The anode terminal piece is electrically connected to the anode connection piece formed in the above, and the cathode connection piece formed by cutting and raising a part of the cathode current collector of the cathode foil, A wound electrolytic capacitor, wherein a cathode terminal member is electrically connected.

  [15] A large number of non-penetrating etching pits formed by the etching process extending in the depth direction from the front surface and the back surface of the anode power storage portion of the anode foil are formed, and the center of the anode power storage portion in the thickness direction A plurality of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface of the cathode power storage unit of the cathode foil, respectively, 15. The wound electrolytic capacitor as described in 14 above, wherein a bare metal portion remains in the thickness direction center of the cathode power storage unit.

  The inventions of the above items will be described below.

  In the invention of [1], at least one side edge of the electrode foil material serves as a current collector of the electrode foil. And in an etching process, an etching process is given to the non-masking part of an electrode foil raw material in the state which masked the surface and the back surface of the said side edge part, respectively. Therefore, neither the front surface nor the back surface of the current collector of the electrode foil is subjected to etching treatment. Therefore, the electrical connection resistance between the current collector and the terminal member can be reliably reduced by connecting the terminal member to the current collector. Therefore, by using this electrode foil as the cathode foil or anode foil of the capacitor, the ESR of the capacitor can be reduced.

  In addition, in the etching process, since the surface and the back surface of the side edge portion of the electrode foil material, which is the current collecting portion, are masked, the current collector in which neither the front surface nor the back surface is etched. The part can be formed easily and reliably.

  Moreover, since a desired electrode foil is obtained by sequentially performing a predetermined masking process, an etching process, and a masking agent removal process, an electrode foil can be manufactured easily.

  In the present invention, as the material of the electrode foil, aluminum (including its alloy; the same shall apply hereinafter), tantalum (including its alloy; the same shall apply hereinafter), niobium (including its alloy; Including alloys, the same shall apply hereinafter). Moreover, an internal terminal, an external terminal, etc. are mentioned as a terminal member, A tab terminal, a lead terminal, a lug terminal etc. will be mentioned specifically ,.

  Moreover, in this invention, the coupling | bonding means of a current collection part and a terminal member is not limited. Examples of the joining means include mechanical fastening (eg, caulking, riveting), welding (eg, spot welding, ultrasonic welding, electron beam welding, laser welding), friction stir welding, and soldering.

  In the invention of [2], non-penetrating etching pits extending in the depth direction from the front surface and the back surface are formed in the non-masking portion of the electrode foil material, and the base metal portion is formed in the center in the thickness direction of the non-masking portion. Since the non-masking part is etched so that it remains, in the electrode foil obtained in this way, the bare metal part and the current collecting part remaining in the central part in the thickness direction of the power storage part are metallically connected to each other. ing. Therefore, the electrical resistance between the power storage unit and the current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced by using this electrode foil as the cathode foil or anode foil of the capacitor.

  In the invention of [3], since a predetermined cutting step is included, two electrode foils can be obtained for one electrode foil material. Therefore, an electrode foil can be obtained efficiently.

  In the invention of [4], at least one side edge of the anode foil material serves as a current collector of the anode foil. And in an etching process, an etching process is performed to the non-masking part of an anode foil raw material in the state which masked the surface and the back surface of the said side edge part, respectively. Therefore, neither the front surface nor the back surface of the current collector of the anode foil is subjected to etching treatment. Further, in the chemical conversion step, chemical conversion treatment is performed on the power storage unit (etching unit) of the anode foil material in a state where the front and back surfaces of the side edge portions are respectively masked. Therefore, neither the front surface nor the back surface of the current collector portion of the anode foil is subjected to etching treatment or chemical conversion treatment. Therefore, the electrical connection resistance between the current collector and the terminal member can be reliably reduced by connecting the terminal member to the current collector. Therefore, by using this anode foil, the ESR of the capacitor can be reduced.

  Further, in the etching process and the chemical conversion process, the anode foil material is masked on the surface and the back surface of the side edge portion to be the current collecting portion, respectively, so that the etching process and the chemical conversion treatment are performed on both the front surface and the back surface. It is possible to easily and reliably form a current collecting portion that is not applied.

  Moreover, since an anode foil is obtained by sequentially performing a predetermined masking process, an etching process, a chemical conversion process, and a masking agent removal process, an anode foil can be manufactured easily.

  In the present invention, the material of the anode foil includes a valve metal, and specifically, aluminum, tantalum, niobium, titanium, and the like. Moreover, an internal terminal, an external terminal, etc. are mentioned as a terminal member, A tab terminal, a lead terminal, a lug terminal etc. will be mentioned specifically ,.

  Moreover, in this invention, the coupling | bonding means of a current collection part and a terminal member is not limited. Examples of the coupling means include mechanical fastening (eg, caulking, riveting), welding (eg, spot welding, ultrasonic welding, electron beam welding, laser welding), friction stir welding, and soldering.

  In the invention of [5], as in the invention of [2] above, in the anode foil, the electrical resistance between the power storage unit and the current collector can be significantly reduced. Therefore, the ESR of the capacitor can be further reduced.

  In the invention of [6], two anode foils can be obtained for one anode foil material as in the invention of [3]. Therefore, an anode foil can be obtained efficiently.

  In the invention of [7], it is possible to provide an electrode foil for a capacitor that can reliably reduce the electrical connection resistance between the current collector and the terminal member.

  In the invention of [8], it is possible to provide an anode foil for a capacitor that can reliably reduce the electrical connection resistance between the current collector and the terminal member.

  In the invention of [9], the electrical connection resistance between the current collector of the electrode foil (cathode foil or anode foil) and the terminal member can be surely reduced, that is, a low ESR multilayer electrolytic capacitor is provided. Can be provided.

  In the invention of [10], the electrical connection resistance between the current collector of the electrode foil (cathode foil or anode foil) and the terminal member can be reliably reduced, that is, a low ESR wound electrolytic capacitor. Can be provided.

  In the invention of [11], in the anode foil, the front surface and the back surface of the anode current collector are not subjected to the etching treatment and the chemical conversion treatment over the entire length direction of the anode current collector. Since the anode terminal member is electrically connected to the anode current collector, the electrical connection resistance between the anode current collector and the anode terminal member can be reliably reduced. Similarly, in the cathode foil, neither the etching treatment nor the chemical conversion treatment is performed on the entire surface in the length direction of the cathode current collector on the front and back surfaces of the cathode current collector. Since the cathode terminal member is electrically connected to the electrical part, the electrical connection resistance between the cathode current collector and the cathode terminal member can be reliably reduced. Accordingly, a low ESR multilayer electrolytic capacitor can be provided.

  Furthermore, in the anode foil, the anode current collector is folded in a zigzag manner, whereby the first anode unit current collector and the second anode unit current collector that constitute the anode current collector are sequentially laminated. For this reason, the first anode unit current collector and the second anode unit current collector are in contact with each other in a substantially surface contact state, and the contact area between the two is increased. Therefore, the electrical resistance between the first anode unit current collector and the second anode unit current collector can be reduced. Similarly, in the cathode foil, the cathode current collector is folded in a zigzag manner, so that the first cathode unit current collector and the second cathode unit current collector constituting the cathode current collector are sequentially stacked. Therefore, the first cathode unit current collector and the second cathode unit current collector are in contact with each other in a substantially surface contact state, and the contact area between the two is increased. Therefore, the electrical resistance between the first cathode unit current collector and the second cathode unit current collector can be reduced. Therefore, the ESR of the capacitor can be further reduced.

  Furthermore, since the first anode unit current collector and the second anode unit current collector are in contact with each other in a substantially surface contact state, the first anode unit current collector is connected to the second anode unit current collector (or the second anode unit current collector). The path length of the current flowing from the two anode unit current collector to the first anode unit current collector can be shortened. Similarly, since the first cathode unit current collector and the second cathode unit current collector are in contact with each other in a substantially surface contact state, the first cathode unit current collector to the second cathode unit current collector (or The path length of the current flowing from the second cathode unit current collector to the first cathode unit current collector can be shortened.

  In addition, since the second anode unit current collector is interposed between the two adjacent first anode unit current collectors in the anode current collector of the anode foil, the second anode unit current collector is disposed. The portion functions as a spacer for forming a gap between two anode unit power storage units adjacent to each other. Therefore, there is an advantage that the degree of accommodation of the cathode unit power storage unit is good between two anode unit power storage units adjacent to each other. Similarly, in the cathode current collector of the cathode foil, since the second cathode unit current collector is interposed between two adjacent first cathode unit current collectors, the second cathode unit current collector. The portion functions as a spacer for forming a gap between two adjacent cathode unit power storage units. Therefore, there is an advantage that the degree of accommodation of the anode unit power storage unit is good between two adjacent cathode unit power storage units.

  In the invention of [12], in the anode current collector of the anode foil, the first anode unit current collector and the second anode unit current collector are joined together in the state of being sequentially laminated. The electrical resistance between the unit current collector and the second anode unit current collector can be greatly reduced. Similarly, in the cathode current collector of the cathode foil, the first cathode unit current collector is joined to the first cathode unit current collector and the second cathode unit current collector in a sequentially stacked state. The electrical resistance between the second cathode unit current collector and the second cathode unit current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  In addition, as a joining means between the first anode unit current collector and the second anode unit current collector, and a joining means between the first cathode unit current collector and the second cathode unit current collector, mechanical fastening (eg, caulking) , Riveting), welding (eg spot welding, ultrasonic welding, electron beam welding, laser welding), friction stir welding, soldering, friction welding, and the like.

  In the invention of [13], in the anode electricity storage part of the anode foil, a large number of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface of the anode unit electricity storage part are formed, respectively, Since the bare metal portion remains at the center of the anode unit power storage unit in the thickness direction, the metal base portion remaining at the center of the anode unit power storage unit in the thickness direction and the anode current collector are metallically connected to each other. ing. Therefore, the electrical resistance between the anode unit power storage unit and the anode current collector can be greatly reduced. Similarly, in the cathode power storage unit of the cathode foil, a large number of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface of the cathode unit power storage unit are formed. Since the ingot portion remains in the central portion in the thickness direction, the ingot portion and the cathode current collector remaining in the central portion in the thickness direction of the cathode unit power storage portion are metallically connected to each other. Therefore, the electrical resistance between the cathode unit power storage unit and the cathode current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  In the invention of [14], in the anode foil, the front surface and the back surface of the anode current collector are not subjected to the etching treatment and the chemical conversion treatment over the entire length direction of the anode current collector. Since the anode terminal member is electrically connected to a predetermined part of the anode current collector, the electrical connection resistance between the anode current collector and the anode terminal member can be reliably reduced. . Similarly, in the cathode foil, neither the etching treatment nor the chemical conversion treatment is performed on the entire surface in the length direction of the cathode current collector on the front and back surfaces of the cathode current collector. Since the cathode terminal member is electrically connected to a predetermined portion of the electrical part, the electrical connection resistance between the cathode current collector and the cathode terminal member can be reliably reduced. Accordingly, a low ESR multilayer electrolytic capacitor can be provided.

  Furthermore, the anode connection piece portion, which is a portion of the anode current collector portion to which the anode terminal member is electrically connected, is formed by cutting and raising a part of the anode current collector portion. The one part and the anode current collecting part are connected metallically. Therefore, the electrical connection resistance between the anode connection piece and the anode current collector can be greatly reduced. Furthermore, there is an advantage that the anode connecting piece can be easily formed and can be easily connected to the anode terminal member.

  Similarly, the cathode connection piece portion, which is a portion of the cathode current collector portion to which the cathode terminal member is electrically connected, is formed by cutting and raising a part of the cathode current collector portion. The connection piece and the cathode current collector are connected metallically. Therefore, the electrical connection resistance between the cathode connection piece and the cathode current collector can be greatly reduced. Furthermore, there is an advantage that the cathode connecting piece can be easily formed and can be easily connected to the cathode terminal member.

  In the invention of [15], in the anode foil, a large number of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface, respectively, are formed on the anode power storage unit, and the thickness of the anode power storage unit is increased. Since the base metal portion remains in the center portion in the vertical direction, the base metal portion remaining in the central portion in the thickness direction of the anode power storage portion and the anode current collector portion are metallically connected to each other. Therefore, the electrical resistance between the anode power storage unit and the anode current collector can be significantly reduced. Similarly, in the cathode foil, a large number of non-penetrating etching pits generated by the etching process extending in the depth direction from the front surface and the back surface of the cathode power storage unit are formed, and the thickness direction center of the cathode power storage unit is formed. Since the bare metal portion remains, the bare metal portion remaining at the central portion in the thickness direction of the cathode power storage unit and the cathode current collector are metallicly connected to each other. Therefore, the electrical resistance between the cathode power storage unit and the cathode current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  The present invention has the following effects.

  In the invention of [1], since neither the front surface nor the back surface of the current collector portion of the electrode foil is subjected to the etching process, the current collector portion is connected to the current collector portion by connecting a terminal member to the current collector portion. The electrical connection resistance with the terminal member can be reliably reduced. Therefore, by using this electrode foil as the cathode foil or anode foil of the capacitor, the ESR of the capacitor can be reduced.

  In addition, in the etching process, since the surface and the back surface of the side edge portion of the electrode foil material, which is the current collecting portion, are masked, the current collector in which neither the front surface nor the back surface is etched. The part can be formed easily and reliably.

  Moreover, since a desired electrode foil is obtained by sequentially performing a predetermined masking process, an etching process, and a masking agent removal process, an electrode foil can be manufactured easily.

  In the invention of [2], the bare metal portion and the current collecting portion remaining in the central portion in the thickness direction of the power storage portion are metallically connected to each other, so that the electrical resistance between the power storage portion and the current collection portion is greatly increased. Can be reduced. Therefore, the ESR of the capacitor can be further reduced by using this electrode foil as the cathode foil or anode foil of the capacitor.

  In the invention of [3], two electrode foils can be obtained for one electrode foil material. Therefore, an electrode foil can be obtained efficiently.

  In the invention of [4], since neither the front surface nor the back surface of the current collector portion of the anode foil is subjected to etching treatment or chemical conversion treatment, the current collector is connected by connecting a terminal member to this current collector portion. The electrical connection resistance between the portion and the terminal member can be reliably reduced. Therefore, by using this anode foil, the ESR of the capacitor can be reduced.

  Further, in the etching process and the chemical conversion process, the anode foil material is masked on the surface and the back surface of the side edge portion to be the current collecting portion, respectively, so that the etching process and the chemical conversion treatment are performed on both the front surface and the back surface. It is possible to easily and reliably form a current collecting portion that is not applied.

  Moreover, since a desired anode foil is obtained by sequentially performing a predetermined masking process, an etching process, a chemical conversion process, and a masking agent removal process, an anode foil can be manufactured easily.

  In the invention of [5], as in the invention of [2] above, the ground metal part and the current collecting part remaining in the central portion in the thickness direction of the power storage part are connected to each other in a metallic manner. The electrical resistance between the two parts can be greatly reduced. Therefore, ESR of the capacitor can be further reduced by using this anode foil.

  In the invention of [6], two anode foils can be obtained for one anode foil material as in the invention of [3]. Therefore, an anode foil can be obtained efficiently.

  In the invention of [7], it is possible to provide an electrode foil for a capacitor that can reliably reduce the electrical connection resistance between the current collector and the terminal member.

  In the invention of [8], it is possible to provide an anode foil for a capacitor that can reliably reduce the electrical connection resistance between the current collector and the terminal member.

  In the invention of [9], the electrical connection resistance between the current collector of the electrode foil (cathode foil or anode foil) and the terminal member can be surely reduced, that is, a low ESR multilayer electrolytic capacitor is provided. Can be provided.

  In the invention of [10], the electrical connection resistance between the current collector of the electrode foil (cathode foil or anode foil) and the terminal member can be reliably reduced, that is, a low ESR wound electrolytic capacitor. Can be provided.

  In the invention of [11], in the anode foil, the front surface and the back surface of the anode current collector are not subjected to the etching treatment and the chemical conversion treatment over the entire length direction of the anode current collector. Since the terminal member is electrically connected to the anode current collector, the electrical connection resistance between the anode current collector and the anode terminal member can be reliably reduced. Similarly, in the cathode foil, neither the etching treatment nor the chemical conversion treatment is performed on the entire surface in the length direction of the cathode current collector on the front and back surfaces of the cathode current collector. Since the cathode terminal member is electrically connected to the electrical part, the electrical connection resistance between the cathode current collector and the cathode terminal member can be reliably reduced. Accordingly, a low ESR multilayer electrolytic capacitor can be provided.

  Furthermore, in the anode foil, the anode current collector is folded in a zigzag manner, whereby the first anode unit current collector and the second anode unit current collector that constitute the anode current collector are sequentially laminated. Therefore, the first anode unit current collector and the second anode unit current collector are in contact with each other in a substantially surface contact state, and the contact area between the two is increased. Therefore, the electrical resistance between the first anode unit current collector and the second anode unit current collector can be reduced. Similarly, in the cathode foil, the cathode current collector is folded in a zigzag manner, whereby the first cathode unit current collector and the second cathode unit current collector constituting the cathode current collector are sequentially stacked. Therefore, the first cathode unit current collector and the second cathode unit current collector are in contact with each other in a substantially surface contact state, and the contact area between the two is increased. Therefore, the electrical resistance between the first cathode unit current collector and the second cathode unit current collector can be reduced. Therefore, the ESR of the capacitor can be further reduced.

  Furthermore, since the first anode unit current collector and the second anode unit current collector are in contact with each other in a substantially surface contact state, the first anode unit current collector is connected to the second anode unit current collector (or the second anode unit current collector). The path length of the current flowing from the two anode unit current collector to the first anode unit current collector can be shortened. Similarly, since the first cathode unit current collector and the second cathode unit current collector are in contact with each other in a substantially surface contact state, the first cathode unit current collector to the second cathode unit current collector (or The path length of the current flowing from the second cathode unit current collector to the first cathode unit current collector can be shortened.

  In addition, since the second anode unit current collector is interposed between the two adjacent first anode unit current collectors in the anode current collector of the anode foil, the second anode unit current collector is disposed. The portion functions as a spacer for forming a gap between two anode unit power storage units adjacent to each other. Therefore, there is an advantage that the degree of accommodation of the cathode unit power storage unit is good between two anode unit power storage units adjacent to each other. Similarly, in the cathode current collector of the cathode foil, since the second cathode unit current collector is interposed between two adjacent first cathode unit current collectors, the second cathode unit current collector. The portion functions as a spacer for forming a gap between two adjacent cathode unit power storage units. Therefore, there is an advantage that the degree of accommodation of the anode unit power storage unit is good between two adjacent cathode unit power storage units.

  In the invention of [12], in the anode current collector of the anode foil, the electrical resistance between the first anode unit current collector and the second anode unit current collector can be greatly reduced. Similarly, in the cathode current collector of the cathode foil, the electrical resistance between the first cathode unit current collector and the second cathode unit current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  In the invention of [13], in the anode electricity storage part of the anode foil, the metal base part and the anode current collecting part remaining in the central portion in the thickness direction of the anode unit electricity storage part are metallically connected to each other. The electrical resistance between the part and the anode current collector can be greatly reduced. Similarly, in the cathode power storage unit of the cathode foil, the bare metal portion and the cathode current collector remaining in the central portion in the thickness direction of the cathode unit power storage unit are metallically connected to each other. Therefore, the electrical resistance between the cathode unit power storage unit and the cathode current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  In the invention of [14], in the anode foil, the front surface and the back surface of the anode current collector are not subjected to the etching treatment and the chemical conversion treatment over the entire length direction of the anode current collector. Since the anode terminal member is electrically connected to a predetermined part of the anode current collector, the electrical connection resistance between the anode current collector and the anode terminal member can be reliably reduced. . Similarly, in the cathode foil, neither the etching treatment nor the chemical conversion treatment is performed on the entire surface in the length direction of the cathode current collector on the front and back surfaces of the cathode current collector. Since the cathode terminal member is electrically connected to a predetermined portion of the electrical part, the electrical connection resistance between the cathode current collector and the cathode terminal member can be reliably reduced. Accordingly, a low ESR multilayer electrolytic capacitor can be provided.

  Furthermore, the anode connection piece portion, which is a portion of the anode current collector portion to which the anode terminal member is electrically connected, is formed by cutting and raising a part of the anode current collector portion. The one part and the anode current collecting part are connected metallically. Therefore, the electrical connection resistance between the anode connection piece and the anode current collector can be greatly reduced. Furthermore, there is an advantage that the anode connecting piece can be easily formed and can be easily connected to the anode terminal member.

  Similarly, the cathode connection piece portion, which is a portion of the cathode current collector portion to which the cathode terminal member is electrically connected, is formed by cutting and raising a part of the cathode current collector portion. The connection piece and the cathode current collector are connected metallically. Therefore, the electrical connection resistance between the cathode connection piece and the cathode current collector can be greatly reduced. Furthermore, there is an advantage that the cathode connecting piece can be easily formed and can be easily connected to the cathode terminal member.

  In the invention of [15], in the anode foil, the electrical resistance between the anode power storage unit and the anode current collector can be significantly reduced. Similarly, in the cathode foil, the electrical resistance between the cathode power storage unit and the cathode current collector can be greatly reduced. Therefore, the ESR of the capacitor can be further reduced.

  Next, several embodiments of the present invention will be described below.

  FIG. 1 is a cross-sectional view of the multilayer electrolytic capacitor (C1) according to the first embodiment of the present invention. More specifically, this capacitor (C1) is a laminated aluminum dry electrolytic capacitor.

  As shown in the figure, the capacitor (C1) includes a capacitor element (1), a case (2), a lid member (3) made of an insulating material (eg, rubber), and a pair of anodes as terminal members. Terminal (4a) and cathode terminal (4b).

  The capacitor element (1) is housed in the case (2). In this state, the lid member (3) is attached to the opening of the case (2) to close the opening. The capacitor element (1) is impregnated with a driving electrolyte (not shown). Note that (5) is an insulating layer covering the outer peripheral surface of the capacitor element (1).

  As shown in FIGS. 2-A and 2-B, the capacitor element (1) includes a pair of anode foil (10) and cathode foil (20) as electrode foils, and a separator (30). . Both the anode foil (10) and the cathode foil (20) are made of aluminum (including an alloy thereof, the same shall apply hereinafter).

  In the present invention, the anode foil (10) and the cathode foil (20) may be made of tantalum, niobium, titanium or the like.

  Next, the configurations of the anode foil (10), the cathode foil (20), and the separator (30) of the capacitor element (1) of the capacitor (C1) will be described below.

<Configuration of anode foil (10)>
As shown in FIG. 3, the anode foil (10) has a narrow strip-shaped anode current collector (11) and an anode power storage unit (13) in the unfolded state. An anode terminal (4a) is electrically connected to the anode current collector (11) (see FIG. 1). Electricity is stored in the anode power storage unit (13). The thickness of the anode foil (10) is set larger than the thickness of the cathode foil (20).

  As shown in FIG. 3, the anode power storage unit (13) includes a plurality of (four in this embodiment) anode unit power storage units (13a).

  Each anode unit power storage unit (13a) is formed in a square shape in plan view. Both the front surface and the back surface of the anode unit electricity storage unit (13a) are etched for roughening (enlarging) and formed to form an oxide film layer (41) as a dielectric layer. Processing is performed sequentially.

  In the figure, reference numeral (40) denotes an etching part formed by etching treatment on the front and back surfaces of the anode unit power storage part (13a). A large number of fine non-penetrating etching pits (not shown) are formed in the etching portion (40). An oxide film layer (41) generated by the chemical conversion treatment is formed in the etching portion (40).

  On the other hand, neither the front surface nor the back surface of the anode current collector (11) is subjected to the etching process and the chemical conversion treatment over the entire length direction of the anode current collector (11).

  Further, in the anode current collector (11), the plurality of anode unit power storage units (13a) protrudes to one side of the anode current collector (11) and the anode current collector (11) Are provided at regular intervals in the length direction.

  The anode current collector (11) includes a plurality of (four in this embodiment) first anode unit current collectors (11a) in which each anode unit power storage unit (13a) is connected in series, and two adjacent ones. The second anode unit current collector (11b) is located between the first anode unit current collectors (11a) and (11a).

  As shown in FIG. 2A and FIG. 3, the anode current collector (11) has a second anode unit current collector between two adjacent first anode unit current collectors (11a) and (11a). The electric part (11b) is interposed and the plurality of anode unit power storage parts (13a) are folded in a zigzag manner so as to be parallel to each other. By folding the anode current collector (11) in this way, as shown in FIG. 2-A, the first anode unit current collector (11a) and the second anode unit current collector (11b) are alternately alternated. Are stacked.

  In the present invention, the second anode unit current collector (11b) is folded into a plurality of folds such as a double fold or a tri fold, or is not folded at all as shown in FIG. It may be interposed between two adjacent first anode unit current collectors (11a) (11a).

  Further, as shown in FIG. 2A, the first anode unit current collector (11a) and the second anode unit current collector (11b) are mutually stacked by friction stir welding in the state of being sequentially laminated in this manner. Are integrated with each other. In the figure, (J) is a joint (friction stir weld) in which the first anode unit current collector (11a) and the second anode unit current collector (11b) are joined together.

  In the present invention, the first anode unit current collector (11a) and the second anode unit current collector (11b) may be joined to each other by mechanical fastening (eg, caulking, riveting), They may be joined to each other by welding (eg, spot welding, ultrasonic welding, electron beam welding, laser welding), or may be joined to each other by soldering or friction welding.

  As shown in FIG. 1, the anode terminal (4a) is welded to the anode current collector (11) of the anode foil (10) (eg, spot welding, ultrasonic welding, electron beam welding, laser welding). The anode terminal (4a) is electrically connected to the anode current collector (11) by being directly joined (joined) by friction stir welding or soldering. The anode terminal (4a) protrudes outside through the lid member (3).

  In the present invention, the anode current collector (11) and the anode terminal (4a) may be electrically connected by being coupled to each other by mechanical fastening (eg, caulking, riveting).

<Configuration of cathode foil (20)>
As shown in FIG. 3, the cathode foil (20) has a narrow strip-shaped cathode current collector (21) and a cathode power storage unit (23) in the unfolded state. A cathode terminal (4b) is electrically connected to the cathode current collector (21) (see FIG. 1). Electricity is stored in the cathode power storage unit (23).

  As shown in FIG. 3, the cathode power storage unit (23) includes a plurality (four in this embodiment) of cathode unit power storage units (23a).

  Each cathode unit power storage unit (23a) is formed in a square shape in plan view. Both the front surface and the back surface of the cathode unit power storage unit (23a) are subjected to an etching process for roughening (enlarging), but in order to form an oxide film layer as a dielectric layer There is no chemical conversion treatment.

  In the figure, reference numeral (40) denotes an etching part formed by etching on the front and back surfaces of the cathode unit power storage part (23a). A large number of fine non-penetrating etching pits are formed in the etching portion (40).

  On the other hand, neither the front surface nor the back surface of the cathode current collector (21) is subjected to etching or chemical conversion over the entire length of the cathode current collector (21).

  Further, in the cathode current collector (21), the plurality of cathode unit power storage units (23a) protrudes to one side of the cathode current collector (21) and the cathode current collector (21) Are provided at regular intervals in the length direction.

  The cathode current collector (21) includes a plurality of (four in this embodiment) first cathode unit current collectors (21a) in which each cathode unit power storage unit (23a) is connected in series, and two adjacent ones. The second cathode unit current collector (21b) is located between the first cathode unit current collectors (21a) and (21a).

  As shown in FIGS. 2B and 3, the cathode current collector (21) is disposed between the two first cathode unit current collectors (21a) (21a) adjacent to each other. Folded in a zigzag manner so that the cathode unit power storage unit (23a) is interposed one by one between the two first anode unit power storage units (13a) and (13a) adjacent to each other with the electrical unit (21b) interposed therebetween. It is. By folding the cathode current collector (21) in this way, as shown in FIG. 2-B, the first cathode unit current collector (21a) and the second cathode unit current collector (21b) are sequentially alternated. Are stacked. More specifically, in the present embodiment, the second cathode unit current collector (21b) is folded in two between two adjacent first cathode unit current collectors (21a) (21a). Intervened in a state.

  In this way, the second cathode unit current collector (21b) is interposed between two adjacent first cathode unit current collectors (21a) and (21a) in a state where the second cathode unit current collector (21b) is folded in two. The reason is as follows. That is, since the thickness of the anode foil (10) is generally set larger than the thickness of the cathode foil (20), the second cathode unit current collector (21b) of the cathode foil (20) The wall thickness of the second cathode unit current collector (21b) is doubled by folding the second cathode unit current collector (21b) into the second thickness of the anode foil (10). It corresponds to the thickness of the anode unit current collector (11b).

  In the present invention, the second cathode unit current collector (21b) is in a state of being folded into a plurality of folds such as a tri-fold, or not folded at all, and two first cathode unit current collectors adjacent to each other. (21a) It may be interposed between (21a).

  Further, as shown in FIG. 2B, the first cathode unit current collector (21a) and the second cathode unit current collector (21b) are mutually stacked by friction stir welding in the state of being sequentially stacked in this way. Are joined together (joined part J).

  In the present invention, the first cathode unit current collector (21a) and the second cathode unit current collector (21b) may be joined to each other by mechanical fastening (eg, caulking, riveting), They may be joined to each other by welding (eg, spot welding, ultrasonic welding, electron beam welding, laser welding), or may be joined to each other by soldering or friction welding.

  As shown in FIG. 1, the cathode terminal (4b) is welded to the cathode current collector (21) of the cathode foil (20) (eg, spot welding, ultrasonic welding, electron beam welding, laser welding). The cathode terminal (4b) is electrically connected to the cathode current collector (21) by being directly coupled (joined) by friction stir welding or soldering. The cathode terminal (4b) passes through the lid member (3) and protrudes to the outside.

  In the present invention, the cathode current collector (21) and the cathode terminal (4b) may be electrically connected by being coupled to each other by mechanical fastening (eg, caulking, riveting).

<Configuration of separator (30)>
The separator (30) is made of an insulating material such as kraft paper or manila hemp and has a belt-like shape in the developed state.

  As shown in FIGS. 2-A and 2-B, the separator (30) is disposed between the anode unit power storage unit (13a) and the cathode unit power storage unit (23a) adjacent to each other. It is folded in a zigzag manner so that a part (predetermined part) is interposed. The separator (30) is impregnated with a driving electrolyte.

  Next, a method for manufacturing the anode foil (10) and the cathode foil (20) in the capacitor element (1) of the capacitor (C1) will be described below.

<Method for producing anode foil (10)>
FIG. 4 is a block diagram showing a manufacturing process of the anode foil (10). As shown in the figure, the anode foil (10) is manufactured through a masking step (100), an etching step (101), a chemical conversion step (102), a cutting step (103) and a masking agent removal step (104) in this order. Is done.

[Masking process (100)]
In FIG. 5-A and FIG. 5-B, (10A) is an anode foil material (electrode foil material) for the anode foil (10). The anode foil material (10A) is made of aluminum and has a wide band shape. The width of the anode foil material (10A) is set in a range of 2 to 150 mm, for example, and the thickness thereof is set in a range of 50 to 400 μm, for example.

  In the masking process (100), the masking agent is screen-printed or gravure-printed continuously on the front and back surfaces of both side edges in the width direction of this anode foil material (10A) with a predetermined width along each side edge. Masking is performed by applying by a printing method such as.

  In the figure, (42) is a masking portion of the anode foil material (10A). (42a) is a masking layer made of a masking agent and formed on the masking portion (42) of the anode foil material (10A). Further, (43) is a non-masking portion of the anode foil material (10A).

  After applying the masking agent in this way, the masking agent is dried.

  The thickness of the masking layer (42a) is set in the range of 0.1 to 1 μm, for example. The width of the masking layer (42a) is set in the range of 1 to 10 mm, for example.

  In the present invention, the type of the masking agent is not limited, but it is desirable to use a resin-based paint as the masking agent, and specifically, from acrylic, epoxy-based, urethane-based and polyester-based resin paints. It is desirable to use one or more paints selected from the group consisting of: The reason is as follows. That is, since such a paint has a property that the viscosity is relatively low and the strength after curing is high, the masking layer (42a) formed by such a paint is not used during the etching process. This is because there is almost no risk of intentionally peeling, and furthermore, peeling can be surely performed.

[Etching process (101)]
Next, a large number of fine non-penetrating etching pits extending in the depth direction from the front and back surfaces of the anode foil material (10A) are formed in the masked portion of the anode foil (10A) in this way. In addition, an etching process is performed by a known method so that the base metal part (M) remains in the central part in the thickness direction of the non-masking part (43). 6A and 6B are a plan view and a cross-sectional view of the anode foil material (10A) after the etching step (101), respectively. In this etching process, for example, the entire anode foil material (10A) is immersed in a predetermined etching solution in a state where a predetermined portion is masked, and an alternating current or a direct current is applied to the anode foil material (10A) as necessary. Apply and do. In this etching process, chemical etching and electrical etching are sequentially performed. As the etchant, for example, an inorganic acid such as sulfuric acid or hydrochloric acid and a metal salt solution are used.

  By this etching process, as shown in FIGS. 6A and 6B, an etched portion (40) composed of a large number of fine non-penetrating etching pits is formed in the non-masking portion (43) of the anode foil material (10A). Is done. This non-masking part (43) serves as the anode power storage part (13) of the anode foil (10). On the other hand, since the masking layer (42a) is formed on the masking portion (42) of the anode foil material (10A), such an etching portion is not formed.

[Chemical conversion process (102)]
Next, a chemical conversion treatment is applied to the anode electricity storage unit (13) of the anode foil material (10A) by a known method in a state where the predetermined portion is masked. 7A and 7B are a plan view and a cross-sectional view, respectively, of the anode foil material (10A) after the chemical conversion step (102). This chemical conversion treatment is performed, for example, by immersing the entire anode foil material (10A) in a predetermined electrolyte solution while masking a predetermined portion, and applying an electric current to the anode foil material (10A). In addition, boric acid, phosphoric acid, adipic acid, etc. are used as electrolyte solution.

  By this chemical conversion treatment, as shown in FIGS. 7-A and 7-B, the surface of the anode electricity storage part (13) (that is, the etching part (40)) of the anode foil material (10A) is dielectrically formed. An oxide film layer (41) as a body layer is formed. On the other hand, since the masking layer (42a) is formed on the masking portion (42) of the anode foil material (10A), such an oxide film layer is not formed.

[Cutting step (103)]
Next, the anode storage part (13) of the anode foil material (10A) is cut in a zigzag shape at a predetermined pitch in the length direction of the anode foil material (10A) along the planned cutting line (L). To divide. FIG. 8 is a plan view of the anode foil material (10A) after the cutting step (103). In the present embodiment, the cutting pitch is an equal pitch.

  By this cutting, two anode foils (10) and (10) having the same shape are obtained for each anode foil material (10A) as shown in FIG.

[Masking agent removal step (104)]
Subsequently, the masking agent (namely, masking layer (42a)) of the anode foil material (10A) is removed. 9A and 9B are a plan view and a cross-sectional view, respectively, of the anode foil material (10A) after the masking agent removal step (104). The removal of the masking agent is performed, for example, by immersing the entire anode foil material (10A) in a predetermined solvent (for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene) to dissolve the masking agent. This masking agent removing portion is the anode current collector (11). On the front and back surfaces of the anode current collector (11), an etching part (etching layer) generated by the etching process and an oxide film layer generated by the chemical conversion process are formed over the entire length direction. Not.

  The desired anode foil (10) is obtained through the above steps.

  In the anode foil (10) shown in FIGS. 9A and 9B, (11a) is a first anode unit current collector, (11b) is a second anode unit current collector, and (13a) is an anode unit electricity storage. Part. Each anode unit power storage unit (13a) is connected to the corresponding anode first unit current collector (11a) of the anode current collector (11) in a manner protruding to one side of the anode current collector (11). It is installed.

<Manufacture of cathode foil (20)>
FIG. 10 is a block diagram showing a manufacturing process of the cathode foil (20). As shown in the figure, the cathode foil (20) is manufactured through a masking step (100), an etching step (101), a cutting step (103), and a masking agent removing step (104) in this order. In addition, the manufacturing process of a cathode foil (20) does not have a chemical conversion process.

[Masking process (100) and etching process (101)]
11A and 11B, (20A) is a cathode foil material (electrode foil material) for the cathode foil (20). The cathode foil material (20A) is made of aluminum and has a wide band shape. The width of the cathode foil material (20A) is set to be the same or substantially the same as the width of the anode foil material (10A), and the thickness is set to a range of 10 to 200 μm, for example.

  In the cathode foil (20A) manufacturing process, the masking process (100) and the etching process (101) are respectively performed in the same manner as the masking process (100) and the etching process (101) of the anode foil material (10A) described above. .

  That is, in the masking step (100), the masking agent is continuously applied with a predetermined width along each side edge on the front and back surfaces of both side edges in the width direction of the cathode foil material (20A). Mask by.

  In the etching step (101), a large number of fine non-penetrating etching pits extending in the depth direction from the front and back surfaces of the non-masking portion (43) of the cathode foil material (20A) in a state where a predetermined portion is masked. Etching is performed by a known method so that the base metal part (M) remains in the central part in the thickness direction of the non-masking part (43).

  By this etching process, as shown in FIGS. 11-A and 11-B, an etched portion (40) composed of many fine non-penetrating etching pits is formed in the non-masking portion (43) of the cathode foil material (20A). Is done. This non-masking part (43) serves as a cathode storage part (23) of the cathode foil (20). On the other hand, since the masking layer (42a) is formed on the masking portion (42) of the cathode foil material (20A), such an etching portion is not formed.

[Cutting step (103)]
Next, the cathode electricity storage unit (23) of the cathode foil material (20A) is cut into a zigzag shape in the longitudinal direction of the cathode foil material (20A) along the planned cutting line (L) and vertically divided into two. FIG. 12 is a plan view of the cathode foil material (20A) after the cutting step (103). In the present embodiment, the cathode power storage unit (23) of the cathode foil material (20A) is cut into a zigzag shape at a repetition interval of 1: 2 in the length direction of the cathode foil material (20A).

  Further, with respect to one material (20A) of the two materials thus divided, an unnecessary part (U) in the cathode power storage unit (23) is cut and removed.

  By this cutting, as shown in FIG. 12, two cathode foils (20) and (20) are obtained for each cathode foil material (20A).

[Masking agent removal step (104)]
Next, the masking agent (that is, masking layer (42a)) of the cathode foil material (20A) is removed. 13A and 13B are a plan view and a cross-sectional view of the cathode foil material (20A) after the masking agent removing step (104), respectively. The removal of the masking agent is performed in the same manner as the removal of the masking agent of the anode foil material (10A) described above. This masking agent removing part is the cathode current collector (21). An etching part (etching layer) generated by the etching process and an oxide film layer generated by the chemical conversion process are formed on the entire surface in the length direction on the front and back surfaces of the cathode current collector (21). Not.

  The desired cathode foil (20) is obtained through the above steps.

  In the anode foil (20) shown in FIGS. 13-A and 13-B, (21a) is the first cathode unit current collector, (21b) is the second cathode unit current collector, and (23a) is the cathode unit electricity storage. Part. Each cathode unit current collector (23a) protrudes from one side of the cathode current collector (21) to the corresponding cathode first unit current collector (21a) of the cathode current collector (21). It is connected continuously.

  The anode foil (10) and cathode foil (20) obtained by the above manufacturing method and the known separator (30) are assembled to each other as described above, so that FIG. The capacitor element (1) shown in B is manufactured.

  Thus, the method for manufacturing the anode foil (10) described above has the following advantages.

  The anode foil material (10A) is subjected to etching treatment and chemical conversion on the non-masking part (43) of the anode foil material (10A) with the masking on the front and back sides of both side edges that will be the anode current collector (11). Since the treatment is performed, neither the etching treatment nor the chemical conversion treatment is performed on the front surface and the back surface of the anode current collector (11) of the anode foil (10). Therefore, by connecting the anode terminal (4a) to the anode current collector (11), the electrical connection resistance between the anode current collector (11) and the anode terminal (4a) is reliably reduced. can do. Therefore, by using this anode foil (10) for the multilayer electrolytic capacitor (C1), the ESR of the capacitor (C1) can be reduced.

  In addition, in the etching step (101) and the chemical conversion step (102), the anode foil material (10A) is masked on the front and back surfaces of the side edge portion to be the anode current collector (11). It is possible to easily and reliably form the anode current collector (11) in which neither the front surface nor the back surface is subjected to the etching treatment and the chemical conversion treatment.

  Moreover, since a desired anode foil (10) is obtained by sequentially performing a predetermined masking step (100), an etching step (101), a chemical conversion step (102), and a masking agent removal step (104), the anode foil ( 10) can be manufactured easily and reliably.

  Further, non-penetrating etching pits extending in the depth direction from the front surface and the back surface of the anode foil material (10A) are formed in the non-masking portion (43), and at the center in the thickness direction of the non-masking portion (43). Since the non-masking part (43) is etched so that the metal part (M) remains, in the anode foil (10) thus obtained, as shown in FIG. The bare metal part (M) remaining in the central part in the thickness direction of the part (13) and the anode current collector (11) are connected metallically. Therefore, the electrical resistance between the anode power storage unit (13) and the anode current collector (11) can be greatly reduced. Therefore, by using this anode foil (10) for the capacitor (C1), the ESR of the capacitor (C1) can be further reduced.

  Furthermore, since this anode foil (10) manufacturing method includes a predetermined cutting step (103), two anode foils (10) and (10) are obtained for each anode foil material (10A). Can do. Therefore, the anode foil (10) can be obtained efficiently.

  Moreover, the manufacturing method of the cathode foil (20) mentioned above has the following advantages.

  The cathode foil material (20A) is subjected to an etching process on the non-masking part (43) of the cathode foil material (20A) while masking the front and back surfaces of both side edges that will become the cathode current collector part (21). Therefore, neither the front surface nor the back surface of the cathode current collector (21) of the cathode foil (20) is subjected to etching treatment. Therefore, by connecting the cathode terminal (4b) to the cathode current collector (21), the electrical connection resistance between the cathode current collector (21) and the cathode terminal (4b) is reliably reduced. can do. Therefore, by using this cathode foil (20) for the multilayer electrolytic capacitor (C1), the ESR of the capacitor (C1) can be reduced.

  In the etching step (101), the cathode foil material (20A) is masked on the surface and the back surface of the side edge portion that becomes the cathode current collector (21). In addition, it is possible to easily and reliably form the cathode current collector (21) not subjected to the etching process.

  Moreover, since a desired cathode foil (20) is obtained by sequentially performing a predetermined masking step (100), an etching step (101) and a masking agent removal step (104), the cathode foil (20) can be easily and It can be manufactured reliably.

  Furthermore, non-penetrating etching pits extending in the depth direction from the front and back surfaces of the non-masking portion (43) of the cathode foil material (20A) are formed, respectively, and at the center in the thickness direction of the non-masking portion (43). Since the non-masking part (43) is etched so that the metal part (M) remains, in the cathode foil (20) thus obtained, as shown in FIG. The metal base part (M) remaining in the central part in the thickness direction of the part (23) and the cathode current collector part (21) are metallically connected to each other. Therefore, the electrical resistance between the cathode power storage unit (23) and the cathode current collector (21) can be greatly reduced. Therefore, the ESR of the capacitor (C1) can be further reduced by using the cathode foil (20) for the capacitor (C1).

  Furthermore, since this cathode foil (20) manufacturing method includes a predetermined cutting step (103), two cathode foils (20) and (20) are obtained for each cathode foil material (20A). Can do. Therefore, the cathode foil (20) can be obtained efficiently.

  Furthermore, the multilayer electrolytic capacitor (C1) of the first embodiment has the following advantages.

  In the anode foil (10), the front surface and the back surface of the anode current collector (11) are both subjected to etching treatment and chemical conversion treatment over the entire length direction of the anode current collector (11). Since the anode terminal (4a) is electrically connected to the anode current collector (11), the electrical connection between the anode current collector (11) and the anode terminal (4a) Resistance can be reliably reduced. Similarly, in the cathode foil (20), both the front surface and the back surface of the cathode current collector (21) are subjected to etching treatment and chemical conversion treatment over the entire length direction of the cathode current collector (21). Since the cathode terminal (4b) is electrically connected to the cathode current collector (21), the electrical current between the cathode current collector (21) and the cathode terminal (4b) is not provided. Connection resistance can be reliably reduced.

  Furthermore, in the anode foil (10), as shown in FIG. 2-A, the anode current collector (11) is folded in a zigzag manner, thereby forming the first anode unit constituting the anode current collector (11). Since the current collector (11a) and the second anode unit current collector (11b) are sequentially stacked, the first anode unit current collector (11a) and the second anode unit current collector (11b) They are in contact with each other in a substantially surface contact state, and the contact area between the two is increased. Therefore, the electrical resistance between the first anode unit current collector (11a) and the second anode unit current collector (11b) can be reduced. Similarly, in the cathode foil (20), as shown in FIG. 2-B, the cathode current collector (21) is folded in a zigzag manner to form the first cathode constituting the cathode current collector (21). Since the unit current collector (21a) and the second cathode unit current collector (21b) are sequentially stacked, the first cathode unit current collector (21a) and the second cathode unit current collector (21b) Are substantially in contact with each other, and the contact area between the two is increased. Therefore, the electrical resistance between the first cathode unit current collector (21a) and the second cathode unit current collector (21b) can be reduced. Therefore, the ESR of the multilayer electrolytic capacitor (C1) can be further reduced.

  Furthermore, since the first anode unit current collector (11a) and the second anode unit current collector (11b) are in contact with each other in a substantially surface contact state, the first anode unit current collector (11a) is connected to the second anode unit current collector (11a). The path length of the current flowing from the anode unit current collector (11b) (or from the second anode unit current collector (11b) to the first anode unit current collector (11a)) can be shortened. Similarly, since the first cathode unit current collector (21a) and the second cathode unit current collector (21b) are in contact with each other in a substantially surface contact state, the first cathode unit current collector (21a) The path length of the current flowing from the two-cathode unit current collector (21b) (or from the second cathode unit current collector (21b) to the first cathode unit current collector (21a)) can be shortened.

  In addition, as shown in FIG. 1, the second anode unit current collector (11b) is interposed between two first anode unit current collectors (11a) (11a) adjacent to each other. The second anode unit current collector (11b) functions as a spacer for forming a gap between the two anode unit power storage units (13a) and (13a) adjacent to each other. Therefore, there is an advantage that the degree of accommodation of the cathode unit power storage unit (23a) is good between two adjacent anode unit power storage units (13a) and (13a). Similarly, since the second cathode unit current collector (21b) is interposed between the two first cathode unit current collectors (21a) (21a) adjacent to each other, the second cathode unit current collector. The part (21b) functions as a spacer for forming a gap between the two adjacent cathode unit power storage parts (23a) and (23a). Therefore, there is an advantage that the anode unit power storage unit (13a) is well-fitted between the two cathode unit power storage units (23a) and (23a) adjacent to each other.

  Further, in the anode current collector (11) of the anode foil (10), as shown in FIG. 2-A, the first anode unit current collector (11a) and the second anode unit current collector (11b) are sequentially formed. Since they are joined together in a stacked state, the electrical resistance between the first anode unit current collector (11a) and the second anode unit current collector (11b) can be greatly reduced. Similarly, in the cathode current collector (21) of the cathode foil (20), as shown in FIG. 2-B, a first cathode unit current collector (21a) and a second cathode unit current collector (21b) are provided. Since they are joined together in a sequentially stacked state, the electrical resistance between the first cathode unit current collector (21a) and the second cathode unit current collector (21b) can be greatly reduced. Therefore, the ESR of the capacitor (C1) can be further reduced, and a high-performance capacitor (C1) can be provided.

  FIG. 14 is a cross-sectional view of a wound electrolytic capacitor (C2) according to the second embodiment of the present invention. More specifically, this capacitor (C2) is a wound aluminum dry electrolytic capacitor.

  This capacitor (C2) includes a capacitor element (51), a cylindrical case (52), a lid member (53) made of an insulating material (eg, rubber), and a pair of anode external terminals (54a) as terminal members. ) And an external terminal for cathode (54b). In the second embodiment, the anode external terminal (54a) and the cathode external terminal (54b) are lug terminals in detail.

  The capacitor element (51) is housed in the case (52). In this state, the lid member (53) is attached to the opening of the case (52) to close the opening. The capacitor element (51) is impregnated with a driving electrolyte (not shown). Reference numeral (57) denotes a fixing member for fixing the capacitor element (51).

  As shown in FIG. 15, the capacitor element (51) includes an anode foil (10) and a cathode foil (20) as electrode foils, and a separator (30). Both the anode foil (10) and the cathode foil (20) are made of aluminum (including an alloy thereof, the same shall apply hereinafter).

  In the present invention, the anode foil (10) and the cathode foil (20) may be made of tantalum, niobium, titanium or the like.

  Next, the configurations of the anode foil (10), the cathode foil (20), and the separator (30) of the capacitor element (51) of the capacitor (C2) will be described below.

<Configuration of anode foil (10)>
As shown in FIG. 15, the anode foil (10) has a strip shape in the developed state. On one side edge of the anode foil (10), an anode current collector (11) to which the anode external terminal (54a) is electrically connected is continuously provided with a predetermined width along the side edge. It has been. In addition, a portion on the other side of the anode foil (10) from the anode current collector (11) serves as an anode power storage unit (13).

  In this anode foil (10), the width of the anode current collector (11) is set in the range of 2 to 10 mm, for example. The width | variety of the anode electrical storage part (13) is set to the range of 3-250 mm, for example.

  Both the front surface and the back surface of the anode power storage unit (13) are subjected to an etching process for roughening (enlarging) and a chemical conversion process for forming an oxide film layer (41) as a dielectric layer. It is given sequentially.

  In the figure, reference numeral (40) denotes an etching portion formed by etching on the front surface and the back surface of the anode power storage portion (13). A large number of fine non-penetrating etching pits (not shown) are formed in the etching portion (40). An oxide film layer (41) generated by the chemical conversion treatment is formed in the etching portion (40).

  On the other hand, neither the front surface nor the back surface of the anode current collector (11) is subjected to the etching process and the chemical conversion treatment over the entire length direction of the anode current collector (11).

  Furthermore, a part of the anode current collector (11) of the anode foil (10) is cut and raised to form an anode connecting piece (15). The anode connecting piece (15) also functions as an anode internal terminal, and is bent so as to protrude outward from the anode current collector (11).

<Configuration of cathode foil (20)>
As shown in FIG. 15, the cathode foil (20) has a strip shape in the developed state. At one side edge of the cathode foil (20), a cathode current collector (21) to which the external terminal for cathode (54b) is electrically connected is continuously provided with a predetermined width along the side edge. It has been. Further, a portion of the cathode foil (20) on the other side of the cathode current collector (21) is a cathode power storage unit (23).

  In this cathode foil (20), the width of the cathode current collector (21) is set, for example, in the range of 2 to 10 mm. The width | variety of a cathode electrical storage part (23) is set to the range of 3-250 mm, for example.

  Both the front and back surfaces of the cathode power storage unit (23) are subjected to etching treatment, but are not subjected to chemical conversion treatment. In the figure, reference numeral (40) denotes an etched portion formed by an etching process.

  On the other hand, neither the front surface nor the back surface of the cathode current collector (21) is subjected to etching or chemical conversion over the entire length of the cathode current collector (21).

  Further, a part of the cathode current collector (21) of the cathode foil (20) is cut and raised to form the cathode connection piece (25). The cathode connection piece (25) also functions as an internal terminal for the cathode, and is bent so as to protrude outward from the cathode current collector (21).

<Configuration of separator (30)>
The separator (30) is made of an insulating material such as kraft paper or manila paper, and has a strip shape in the unfolded state. The palator (30) is impregnated with a driving electrolyte.

  Thus, in the capacitor element (51) of the wound electrolytic capacitor (C2) of the second embodiment, as shown in FIG. 15, the anode foil (10) and the cathode foil (20) are both ( 10) It is manufactured by winding with the separator (30) interposed between (20).

  In this capacitor (C2), as shown in FIG. 14, the anode external terminal (54a) is coupled to the anode connecting piece (15) of the anode foil (10) by fastening the rivet (56), thereby connecting the anode. The anode external terminal (54a) is electrically connected to the one part (15). Also, the cathode external terminal (54b) is coupled to the cathode connection piece (25) of the cathode foil (20) by fastening the rivet (56), so that the cathode connection terminal (25) is connected to the cathode external terminal (54b). ) Is electrically connected. The rivet (56) is made of metal, for example, aluminum.

  In the present invention, the anode connecting piece (15) and the external terminal for anode (54a), and the cathode connecting piece (25) and the external terminal for cathode (54b) are both mechanical fastenings other than riveting (examples) : May be electrically connected by being coupled to each other by caulking), or may be connected to each other by welding (eg spot welding, ultrasonic welding, electron beam welding, laser welding), friction stir welding, soldering, etc. By being coupled, they may be electrically connected.

  Thus, in this capacitor (C2), the anode foil (10) includes the masking step (100), the etching step (101), the chemical conversion step (102), and the masking agent described in the first embodiment. It manufactures through a removal process (104) sequentially. However, in this case, the cutting process is not performed.

  The cathode foil (20) is manufactured through the masking step (100), the etching step (101), and the masking agent removal step (104) described in the first embodiment. However, in this case, the chemical conversion process and the cutting process are not performed.

  Thus, the wound electrolytic capacitor (C2) of the second embodiment has the following advantages.

  In the anode foil (10), the front surface and the back surface of the anode current collector (11) are both subjected to etching treatment and chemical conversion treatment over the entire length direction of the anode current collector (11). Since the anode external terminal (54a) is electrically connected to a predetermined portion of the anode current collector (11), the anode current collector (11) is connected to the anode external terminal (54a). It is possible to reliably reduce the electrical connection resistance. Similarly, in the cathode foil (20), both the front surface and the back surface of the cathode current collector (21) are subjected to etching treatment and chemical conversion treatment over the entire length direction of the cathode current collector (21). Since the cathode external terminal (54b) is electrically connected to a predetermined portion of the cathode current collector (21), the cathode current collector (21) and the cathode external terminal (54b) The electrical connection resistance between the two can be reliably reduced.

  Furthermore, as shown in FIG. 15, the anode connecting piece (15), which is a portion of the anode current collecting portion (10) to which the anode external terminal (54a) is electrically connected, is connected to the anode current collecting portion (11). Therefore, the anode connecting piece (15) and the anode current collector (11) are metallically connected. Therefore, the electrical connection resistance between the anode connection piece (15) and the anode current collector (11) can be greatly reduced. Furthermore, the anode connecting piece (15) can be easily formed, and there is an advantage that it can be easily connected to the anode external terminal (54a).

  Similarly, the cathode connecting piece (25), which is the portion of the cathode current collector (20) to which the cathode external terminal (54b) is electrically connected, is partially cut off from the cathode current collector (21). Thus, the cathode connecting piece (25) and the cathode current collector (21) are metallically connected. Therefore, the electrical connection resistance between the cathode connection piece (25) and the cathode current collector (21) can be greatly reduced. Furthermore, there is an advantage that the cathode connecting piece (25) can be easily formed and can be easily connected to the cathode external terminal (54b).

  Further, in the anode foil (10), the bare metal part (M) remaining at the central portion in the thickness direction of the anode power storage part (13) and the anode current collecting part (11) are metallically connected to each other (FIG. 9). -B), the electrical resistance between the anode power storage unit (13) and the anode current collector (11) can be greatly reduced. Similarly, in the cathode foil (20), the bare metal portion (M) remaining at the center in the thickness direction of the cathode power storage portion (23) and the cathode current collector portion (21) are metallically connected to each other (see FIG. 13-B), the electrical resistance between the cathode power storage unit (23) and the cathode current collector (21) can be greatly reduced. Therefore, the ESR of the capacitor (C2) can be further reduced.

  Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various setting changes can be made.

  For example, the capacitor according to the above embodiment is a dry electrolytic capacitor, but the capacitor according to the present invention may be a solid electrolytic capacitor or a capacitor of a type other than these.

  In addition, the capacitor and the electrode foil according to the present invention may be for alternating current or for direct current.

  The present invention relates to a method for producing an electrode foil for a capacitor such as a dry electrolytic capacitor and a solid electrolytic capacitor, a method for producing an anode foil for a capacitor, an electrode foil for a capacitor, an anode foil for a capacitor, a multilayer electrolytic capacitor, and a wound electrolytic capacitor. Is available.

1 is a cross-sectional view of a multilayer electrolytic capacitor according to a first embodiment of the present invention. It is a perspective view of the capacitor element of the capacitor. It is the perspective view seen from another angle of the capacitor | condenser element of the capacitor | condenser. It is the perspective view which decomposed | disassembled the capacitor | condenser element of the capacitor | condenser into the anode foil, the cathode foil, and the separator. It is a block diagram which shows the manufacturing process of the anode foil of the same capacitor | condenser. It is a top view of the anode foil raw material after a masking process. It is AA sectional view taken on the line in FIG. It is a top view of the anode foil raw material after an etching process. FIG. 6B is a sectional view taken along line BB in FIG. It is a top view of the anode foil raw material after a chemical conversion process. It is CC sectional view taken on the line in FIG. 7-A. It is a top view of the anode foil raw material after a cutting process. It is a top view of the anode foil raw material after a masking agent removal process. It is the DD sectional view taken on the line in FIG. 9-A. It is a block diagram which shows the manufacturing process of the cathode foil of the same capacitor | condenser. It is a top view of the cathode foil raw material after an etching process. It is the EE sectional view taken on the line in FIG. 11-A. It is a top view of the cathode foil raw material after a cutting process. It is a top view of the cathode foil raw material after a masking agent removal process. It is the FF sectional view taken on the line in FIG. 13-A. It is sectional drawing of the winding type electrolytic capacitor which concerns on 2nd Embodiment of this invention. It is the perspective view which decomposed | disassembled the capacitor | condenser element of the capacitor | condenser into the anode foil, the cathode foil, and the separator.

Explanation of symbols

C1: Multilayer electrolytic capacitor 1: Capacitor element
4a: Terminal for anode (terminal member for anode)
4b: Cathode terminal (cathode terminal member)
10: Anode foil (electrode foil)
10A: Anode foil material (electrode foil material)
11: Anode current collector
11a: First anode unit current collector
11b: Second anode unit current collector
13: Anode storage unit
13a: Anode unit storage unit
15: Anode terminal connection piece
20: Cathode foil (electrode foil)
20A: Cathode foil material (electrode foil material)
21: Cathode current collector
21a: First cathode unit current collector
21b: Second cathode unit current collector
23: Cathode storage unit
23a: Cathode unit storage unit
25: Cathode terminal connection piece
30: Separator
40: Etching part
41: Oxide film layer
42: Masking part
42a: Masking layer
43: Non-masking part M: Metal part L: Planned cutting line J: Joint part
C1: Winding type electrolytic capacitor
51: Capacitor element
54a: External terminal for anode (terminal member for anode)
54b: External terminal for cathode (terminal member for cathode)

Claims (8)

In the method of manufacturing a capacitor electrode foil, having a power storage unit and a current collector to which a terminal member is electrically connected,
A masking step of continuously masking at a predetermined width along the side edge on the front and back surfaces of at least one side edge of the strip-shaped electrode foil material,
Etching process in which the non-masking part of the electrode foil material is a power storage part by performing an etching process on the non-masking part of the electrode foil material in a masked state,
After the etching step, by removing the masking agent of the masking portion of the electrode foil material, a masking agent removing step with the masking agent removing portion of the electrode foil material as a current collector,
The manufacturing method of the electrode foil for capacitors characterized by including this.   In the etching step, a large number of non-penetrating etching pits extending in the depth direction from the front surface and the back surface are formed in the non-masking portion of the electrode foil material, and the bare metal portion is formed at the thickness direction center portion of the non-masking portion. The method for producing an electrode foil for a capacitor according to claim 1, wherein the non-masking portion is subjected to an etching treatment so that a residual portion remains. In the masking step, masking is continuously performed at a predetermined width along each side edge on the front and back surfaces of both side edges of the electrode foil material,
The method for producing an electrode foil for a capacitor according to claim 1 or 2, further comprising a cutting step of cutting the power storage portion of the electrode foil material in a zigzag shape in the length direction of the electrode foil material after the etching step. . In the method of manufacturing an anode foil for a capacitor, having a power storage unit and a current collector to which a terminal member is electrically connected,
A masking step of continuously masking at a predetermined width along the side edge respectively on the front and back surfaces of at least one side edge of the strip-shaped anode foil material;
Etching process using the non-masking part of the anode foil material as a power storage part by performing an etching process on the non-masking part of the anode foil material in a masked state,
After the etching step, a chemical conversion step of performing a chemical conversion treatment on the power storage unit of the anode foil material in a masked state,
After the chemical conversion step, by removing the masking agent of the masking portion of the anode foil material, a masking agent removal step with the current collector as the masking agent removal portion of the anode foil material,
The manufacturing method of the anode foil for capacitors characterized by including these.   In the etching step, a large number of non-penetrating etching pits extending in the depth direction from the front surface and the back surface are formed in the non-masking portion of the anode foil material, and a bare metal portion is formed at the center in the thickness direction of the non-masking portion. The method for producing an anode foil for a capacitor according to claim 4, wherein the non-masking portion is subjected to an etching treatment so that a residual portion remains. In the masking step, masking is continuously performed at a predetermined width along each side edge on the front and back surfaces of both side edges of the anode foil material,
The method for producing an anode foil for a capacitor according to claim 4 or 5, further comprising a cutting step of cutting the power storage unit of the anode foil material in a zigzag shape in the length direction of the anode foil material after the chemical conversion step. . The process of manufacturing a cathode foil by the manufacturing method of the electrode foil for capacitors of any one of Claims 1-3,
A method for producing a multilayer electrolytic capacitor comprising: a step of producing an anode foil by the method for producing an anode foil for a capacitor according to any one of claims 4 to 6. A step of producing a cathode foil by the method of producing a capacitor electrode foil according to claim 1 or 2,
A method for producing a wound electrolytic capacitor, comprising: producing an anode foil by the method for producing an anode foil for a capacitor according to claim 4.

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