JP2008218378A - Electrode plate, battery, vehicle, battery-equipped apparatus, manufacturing method of electrode plate, and manufacturing method of battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode plate with a size of a burr or the like made small, and its isolation prevented, a battery which uses the plate and in which the generation of an internal short-circuit generation is restrained, a vehicle with the battery mounted, and a battery-equipped apparatus. <P>SOLUTION: The battery 1 is provided with a positive electrode plate 11, a negative electrode plate 14 and a separator intervening between. Out of the metal foil 12 of the positive electrode plate 11, a separated end face 12f formed by being separated from active material layers 13a, 13b is a separated corrosion end face formed by corrosion treatment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrode plate, a battery including the electrode plate, a vehicle on which the battery is mounted, a battery-mounted device, a method for manufacturing the electrode plate, and a method for manufacturing the battery.

  Conventionally, in manufacturing an electrode plate including a metal foil, a cutting blade or a cutting device using a laser is used to cut the metal foil (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-50302

However, when the electrode plate is cut by such a cutting device, burrs, cutting sagging (hereinafter referred to as burrs, etc.) may occur on the end face of the cut metal foil.
When a battery is manufactured using an electrode plate made of a metal foil having such burrs or the like, burrs or the like are released after the electrode plate is cut, and the released burrs or the like may cause an internal short circuit of the battery.
In addition, burrs or the like generated on the end face may penetrate the separator in the thickness direction of the metal foil and come into contact with electrode plates having different potentials, thereby causing an internal short circuit of the battery.

  The present invention has been made in view of the present situation, and is an electrode plate in which the size of burrs or the like is reduced and the release thereof is prevented, a battery using the same to suppress the occurrence of an internal short circuit, and this battery are mounted. An object of the present invention is to provide a vehicle and a battery-equipped device equipped with this battery. Moreover, it aims at providing the manufacturing method of the electrode plate which suppressed release | extrication of a burr | flash etc., and the manufacturing method of the battery using this electrode plate.

  And the solution is an electrode plate comprising a metal foil having a first main surface and a second main surface parallel to the first main surface, the metal foil comprising the first main surface and the second main surface. The electrode plate has at least one end face connecting to the surface, and at least one of the end faces is a corrosion end face subjected to a corrosion treatment.

In the electrode plate of the present invention, the metal foil has at least one end face, and at least one of the end faces is a corrosion end face. In order to form the corroded end face, for example, there are a technique of forming a corroded end face once formed by cutting, and a technique of cutting the metal foil by the corroding process and using the end face as a corroded end face. However, any method can reduce or remove the burrs once generated by the corrosion treatment, or suppress the generation of burrs. For this reason, by making at least one of the end faces of the metal foil a corrosion end face, it becomes possible to suppress the release of burrs and the like from this end face. Therefore, if this electrode plate is used for a battery, it is possible to reduce the occurrence of internal short circuit of the battery due to burrs or the like released from the metal foil.
Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.

  The metal foil can be appropriately selected in consideration of the active material layer, the electrolyte used in the battery, the electrolyte, the counterpart electrode, and the like, but preferably has a small volume resistivity. Specific examples include copper and aluminum.

  Moreover, as an active material layer, it is arrange | positioned on the at least any surface on the 1st main surface of a metal foil, and a 2nd main surface, for example by application | coating and a thin film formation technique, etc. Things.

Further, the corrosion treatment refers to a treatment in which a specific metal (metal foil) is brought into contact with a corrosive agent and the specific metal foil on the contact surface is corroded (ionized and removed).
As the corrosive agent, for example, when the metal foil is copper, aqua regia, concentrated nitric acid, FeCl ₃ , nitric acid, hot concentrated sulfuric acid, HCl, K ₂ Cr ₂ O ₇ + H ₂ SO ₄ + NaCl, CrO ₃ , (NH ₄ ) ₂ S ₂ O ₈ , KCN, ammonia, KOH, NaOH, LiOH, CaOH, etc., aqua regia is preferred. When the metal foil is aluminum, phosphoric acid, hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, aqua regia, sulfuric acid, acetic acid, ammonia, KOH, NaOH, LiOH, CaOH and the like can be mentioned. However, hydrobromic acid is preferred.
Examples of the state of the corrosive agent include solutions such as liquids or aqueous solutions, solids, and gases. However, the state of the liquid or solution that can quickly contain dissolved ions in the liquid. It is preferable to use one.

  The electrode plate further includes an active material layer disposed on at least one of the first main surface and the second main surface, and the end surface is separated from the active material layer. It is preferable that at least one separated end face is included, and at least one of the separated end faces is an electrode plate formed as a separated corrosion end face which is the corrosion end face.

In the electrode plate of the present invention, the metal foil has at least one separated end face, and at least one of the separated end faces is a separated corrosion end face. Therefore, like the above-mentioned corrosion end face, the release of burrs and the like from the separated corrosion end face can be suppressed. Therefore, if this electrode plate is used for a battery, it is possible to reduce the occurrence of internal short circuit of the battery due to burrs or the like released from the metal foil.
Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.
In addition, since the corrosion treatment is performed on the end face separated from the active material layer, the influence of the corrosion treatment on the active material layer can be suppressed or eliminated.

Further, the separated end face refers to an end face separated from the active material layer among the end faces of the metal foil provided in the electrode plate.
Furthermore, the separation corrosion end surface means an end surface subjected to the corrosion treatment among the separation end surfaces.

  Alternatively, the electrode plate according to claim 1, further comprising an active material layer disposed on at least one of the first main surface and the second main surface, wherein at least one of the corrosion end surfaces is The common metal foil end face that forms a common electrode plate end face in common with the active material layer end face of the active material layer, and at least one of the common metal foil end faces is a common corrosion end face that is the corrosion end face A board is good.

In the electrode plate of the present invention, at least one of the corrosion end faces is a common corrosion end face. Therefore, release of burrs and the like from the common corrosion end face can be suppressed. Therefore, if this electrode plate is used for a battery, it is possible to reduce the occurrence of internal short circuit of the battery due to burrs or the like released from the metal foil.
Moreover, there is an advantage that the area of the active material layer can be increased as compared with the above-described electrode plate in which the active material layer is arranged to be pulled down from the separated end face.

  Another solution is a battery comprising a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, wherein at least one of the positive electrode plate and the negative electrode plate The electrode plate is a battery that is the electrode plate according to any one of the above.

  In the battery of the present invention, the electrode plate described above is used for at least one of the positive electrode plate and the negative electrode plate. Therefore, when this electrode plate is viewed, it is possible to suppress the release of burrs or the like on at least one of the end faces of the metal foil. Therefore, in this battery, it is possible to suppress the occurrence of internal short circuit due to the release of burrs and the like from the metal foil. Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.

The battery is a battery including a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate. Therefore, for example, a wound battery in which a belt-like positive electrode plate and a belt-like negative electrode plate are wound through a belt-like separator can be mentioned. In addition, a stacked battery in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators may be mentioned.
In addition, as a separator, a positive electrode plate and a negative electrode plate are arranged apart from each other, and are composed of fibers or the like and can contain an electrolytic solution inside. Also included are those that play the role of electrolyte.

  Furthermore, in the battery described above, the electrode plate is the electrode plate according to claim 2, and is different in an end surface of the metal foil in a thickness direction of the metal foil via the separator. The end face where another electrode plate of potential exists is the separation corrosion end face, and the separation corrosion end face is the thickness direction from the separator side face of the first main face and the second main face. It is preferable that the battery has a maximum protrusion height toward the separator that is less than the thickness of the separator.

  In the battery of the present invention, among the end faces of the metal foil, the end face where the electrode plates having different potentials exist via the separators in the thickness direction of the metal foil is used as the spaced corrosion end face. In addition, the maximum protruding height of the separated corrosion end face is less than the thickness of the separator. That is, the maximum protrusion height of burrs or the like existing on the spaced corrosion end face is less than the thickness of the separator. Therefore, in this battery, it is possible to more appropriately suppress the occurrence of an internal short circuit due to the protrusions caused by burrs or the like penetrating the separator and the electrode foil coming into contact with electrode plates having different potentials.

  Or it is a battery of Claim 4, Comprising: The said electrode plate is an electrode plate of the said Claim 3, The said separator is provided in the thickness direction of the said metal foil among the end surfaces of the said metal foil. In addition, an end face where other electrode plates having different potentials are present is the common corrosion end face, and the common corrosion end face is from the separator side face among the first main face and the second main face. It is preferable that the battery has a maximum protrusion height toward the separator in the thickness direction that is less than the thickness of the separator.

  In the battery of the present invention, among the end faces of the metal foil, the end face where the electrode plates having different potentials exist via the separator in the thickness direction of the metal foil is used as the common corrosion end face. And the maximum protrusion height of a common corrosion end surface is less than the thickness of a separator. That is, the maximum protrusion height of burrs or the like existing on the common corrosion end face is less than the thickness of the separator. Therefore, in this battery, it is possible to more appropriately suppress the occurrence of an internal short circuit due to the protrusion due to the burr or the like penetrating the separator and the metal foil contacting the electrode plate having a different potential.

  Yet another solution is a vehicle equipped with any of the batteries described above.

  In the vehicle according to the present invention, since the battery mounted on the vehicle suppresses the occurrence of an internal short circuit, it is possible to reduce defects caused by the internal short circuit and to provide a highly reliable vehicle. .

  In addition, a vehicle equipped with a battery refers to a vehicle that can be supplied with electric energy from a battery equipped with all or part of the energy used by the power source, such as an electric vehicle, a hybrid electric vehicle, a forklift, an electric wheelchair, Examples include electric assist bicycles, electric scooters, and railway vehicles.

  Yet another solution is a battery-equipped device equipped with any of the batteries described above.

  In the battery-equipped device of the present invention, since the battery mounted on the battery is suppressed from occurrence of an internal short circuit, it is possible to reduce defects caused by the internal short circuit, and a highly reliable battery-equipped device and can do.

  In addition, as a battery mounting apparatus, what is necessary is just an apparatus which mounts a battery and uses this as at least one of energy sources, For example, in addition to vehicles, such as an electric vehicle and a hybrid electric vehicle, a personal computer, a mobile phone, Examples include various home appliances, office equipment, and industrial equipment driven by batteries.

  Still another solution is a method of manufacturing an electrode plate including a metal foil having a first main surface and a second main surface parallel to the first main surface, wherein the metal foil includes the first main surface and the second main surface. Is an electrode plate manufacturing method including an end surface corrosion process that includes at least one end surface that connects to the surface, and at least one of the end surfaces is subjected to a corrosion treatment to form a corroded end surface.

  The electrode plate manufacturing method of the present invention includes an end face corrosion process in which at least one end face is subjected to a corrosion treatment to form a corroded end face. Therefore, even if burrs or the like have occurred on the end face before the corrosion end face, the end face erosion process can reduce or remove the generated burrs, etc. The release of burrs and the like from the corrosion end face can be suppressed. Thus, when the electrode plate manufactured according to the present invention is used in a battery, the end face is a corroded end face, and burrs or the like may be released from the end face of the metal foil to cause a short circuit inside the battery. Can be reduced. Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.

  In addition, as a technique for corroding the end face in the end face corrosion process, the technique can be appropriately selected according to the state of the corrosive agent to be used. For example, when the state of the corrosive agent is liquid or solution, the portion of the metal foil including the end face is immersed in the corrosive agent, and the corrosive agent is injected at a high pressure toward or near the end face of the metal foil. A method such as bringing a member such as a sponge carrying s into contact with the end face can be used. Moreover, when a corrosive agent is solid, the method of making it contact with an end surface continuously for predetermined time is mentioned. In addition, when the corrosive agent is a gas, a dry etching method using plasma can be used. In view of ease of processing, mass productivity, etc., it is preferable to use a liquid or solution corrosive, and in particular, immersion in this is preferable.

  Furthermore, in the method for manufacturing the electrode plate described above, the electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface, and the end surface includes: An electrode plate comprising at least one separated end face separated from the active material layer, wherein the end face eroding step includes a separated end face erosion process in which at least one of the separated end faces is a separated corrosion end face which is the corrosion end face. It is good to use this manufacturing method.

In the method for manufacturing an electrode plate according to the present invention, the end face corrosion process includes a separated end face corrosion process in which at least one of the separated end faces is a separated corrosion end face which is a corrosion end face for a metal foil having at least one separated end face. Contains. Therefore, even if burrs or the like are generated on the separated end face before being made the separated corrosion end face, the produced burr and the like can be reduced or removed by this separated end face corrosion process. The release of burrs and the like from the spaced corrosion end face of the plate can be suppressed. Thus, when the electrode plate manufactured according to the present invention is used for a battery, there is a possibility that burrs or the like may be separated from the end face of the metal foil and cause a short circuit inside the battery because the end face is a separated corrosion end face. Can be reduced. Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.
In addition, in the separated end surface corrosion step, the separated end surface separated from the active material layer is corroded, so that the influence on the active material layer by the corrosion treatment can be suppressed or eliminated.

In addition, as a method of corroding the separated end surface in the separated end surface corrosion step, it is the same as the above-described end surface corrosion step, and the method can be appropriately selected according to the state of the corrosive agent to be used.
Moreover, it is preferable to perform the corrosion treatment of the metal foil without allowing the corrosive agent to touch the active material layer.

  Alternatively, the electrode plate manufacturing method according to claim 9, wherein the electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface, Prior to the end face corrosion step, the metal foil and the active material layer are cut together to form a common common electrode plate end face, and the active material layer end face of the active material layer and the common metal foil end face which is the end face The end surface corrosion step may be a method for manufacturing an electrode plate that performs the corrosion treatment on the end surface of the common metal foil.

  In the electrode plate manufacturing method of the present invention, the common metal foil end surface is formed in the cutting step, which is performed prior to the end surface corrosion step, but the generated burr and the like can be reduced or removed by the end surface corrosion step. Therefore, it is possible to suppress the release of burrs and the like from the corrosion end face in the manufactured electrode plate. Thus, when the electrode plate manufactured according to the present invention is used for a battery, burrs and the like are separated from the end face of the metal foil, and a short circuit can be generated inside the battery because the end face is a corrosion end face. Can be reduced. Moreover, the internal short circuit of the battery which a burr | flash etc. penetrate through a separator in the thickness direction of metal foil can be suppressed.

  Furthermore, another solution is a method of manufacturing an electrode plate including a metal foil having a first main surface and a second main surface parallel to the first main surface, the first large main surface and a second large format main parallel to the first main surface. A large-sized metal foil having a surface is cut, a portion to be cut of the large-sized metal foil is cut by a corrosion treatment to obtain the electrode plate, and an end surface of the formed metal foil is subjected to the corrosion treatment. It is a manufacturing method of an electrode plate provided with the corrosion cutting process made into a corrosion end face.

  In the electrode plate manufacturing method of the present invention, in the corrosion cutting step, a portion to be cut of the large-sized electrode foil is cut by a corrosion treatment, and the end face of the formed metal foil is used as a corrosion end face. In the electrode plate manufactured according to the present invention, burrs or the like hardly occur on the corrosion end face of the formed metal foil. Therefore, burrs or the like are not easily released from the corrosion end face. Thus, when this electrode plate is used in a battery, the end face of the metal foil is used as a corrosion end face by this manufacturing method, so that burrs or the like are released from the metal foil or penetrate the separator, thereby The possibility of causing a short circuit can be reduced.

  Furthermore, in the method for manufacturing the electrode plate, the electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface, and the corrosion cutting step. Is a large-sized electrode plate in which a plurality of active material layers are arranged apart from each other on at least one of the first large-sized main surface and the second large-sized main surface of the large-sized metal foil. Among the planned cutting portions of the large-sized metal foil, the cutting planned portion located between the active material layers is cut by a corrosion treatment to obtain the electrode plate, and the end surface of the formed metal foil is It is preferable that the electrode plate be separated from the active material layer and have a separated corrosion end face which is the corrosion end face.

In the method for producing an electrode plate of the present invention, in the corrosion cutting step, a portion to be cut of the large-sized electrode foil is cut by a corrosion treatment, and the end face of the formed metal foil is used as a separated corrosion end face. In the electrode plate manufactured according to the present invention, burrs or the like hardly occur on the separated corrosion end face of the formed metal foil. Therefore, it is difficult for burrs or the like to be released from the spaced corrosion end face. Thus, when this electrode plate is used in a battery, the end face of the metal foil is made into a spaced corrosion end face by this manufacturing method, so that burrs or the like are released from the metal foil or pierce the separator. The possibility of causing a short circuit inside can be reduced.
In addition, in the corrosion cutting process, the separated end face that is separated from the active material layer is corroded, so that the influence on the active material layer by the corrosion treatment can be suppressed or eliminated.

  Further, another solution is the above-described electrode plate manufacturing method, wherein the first main surface and the metal foil having the second main surface parallel to the first main surface, the first main surface and the first And an active material layer disposed on at least one of the two main surfaces, wherein the first large main surface and the second large main surface parallel to the first large main surface And a large-sized electrode plate having a large-sized active material layer disposed on at least one of the large-sized first main surface and the large-sized second main surface. The method for producing an electrode plate includes a corrosion cutting step of cutting the large electrode plate and corroding an end face formed by cutting the metal foil to form a corroded end face.

  In the electrode plate manufacturing method of the present invention, in the corrosion cutting step, the large-sized electrode plate is cut with the corrosive liquid sprayed at a high speed, and the end face of the formed metal foil is used as the corrosion end face. For this reason, it is not necessary to provide a corrosion process separately from the cutting process, and the process can be simplified. Moreover, even if burrs or the like occur on the end face of the metal foil, they can be removed or reduced by corrosion. Accordingly, burrs and the like are hardly generated from the corrosion end face. Thus, when this electrode plate is used in a battery, the end face of the metal foil is used as a corrosion end face by this manufacturing method, so that burrs or the like are released from the metal foil or penetrate the separator, thereby The possibility of causing a short circuit can be reduced.

  Furthermore, another solution is a method of manufacturing a battery comprising a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, wherein the positive electrode plate and the negative electrode plate This is a battery manufacturing method in which at least one of the electrode plates is formed by the above-described electrode plate manufacturing method.

  In the battery manufacturing method of the present invention, at least one of the positive electrode plate and the negative electrode plate is manufactured by the above-described manufacturing method. That is, the metal foil in the electrode plate has a spaced corrosion end face. For this reason, it can suppress that a burr | flash etc. isolate | separate from the part which made the end surface of this metal foil into the space | interval corrosion end surface. Therefore, it is possible to manufacture a battery in which the possibility of internal short-circuiting due to the release of burrs or the like from the metal foil or the penetration of the separator is reduced.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings. First, the positive electrode plate 11 will be described. 1A is a perspective view of the positive electrode plate 11, FIG. 1B is a top view of the positive electrode plate 11, and FIG. 1C is a side view of the positive electrode plate 11.
The positive electrode plate 11 has a strip-shaped first main surface 12a extending in the longitudinal direction DL and a second main surface 12b parallel to the first main surface 12a. The positive electrode metal foil 12 made of aluminum and the first main surface extending in the longitudinal direction DL. A positive electrode active material layer 13a disposed in the vicinity of the center in the short-side direction DS of 12a and the second main surface 12b. Among these, the positive electrode metal foil 12 has four positive electrode end surfaces 12c and 12d along the short direction DS, a third positive electrode end surface 12e and a fourth positive electrode end surface 12f along the longitudinal direction DL. It has an end face. Among these, the third positive electrode end surface 12e is a positive electrode separation end surface that is separated from the positive electrode active material layer 13a (hereinafter, the third positive electrode end surface is referred to as a positive electrode separation end surface 12e). Further, the fourth positive electrode end surface 12f is a positive electrode separation corrosion end surface formed by a corrosion treatment, which will be described later (hereinafter, the fourth positive electrode end surface is referred to as a positive electrode separation corrosion end surface 12f).

Next, the negative electrode plate 14 will be described with reference to FIG.
The negative electrode plate 14 has a belt-like first main surface 15a extending in the longitudinal direction DL and a second main surface 15b parallel to the first main surface 15a. The negative electrode metal foil 15 made of copper and the first main surface extending in the longitudinal direction DL. A positive electrode active material layer 16a disposed in the vicinity of the center in the width direction among the upper surface 15a and the second main surface 15b. Among these, the negative electrode metal foil 15 has four end surfaces: a first negative electrode end surface 15c, a second negative electrode end surface 15d, a third negative electrode end surface 15e, and a fourth negative electrode end surface 15f. Among these, the third negative electrode end surface 15e is a negative electrode separation end surface that is separated from the negative electrode active material layer 16a (hereinafter, the third negative electrode end surface is referred to as a negative electrode separation end surface 15e). Further, the fourth negative electrode end surface 15f is a negative electrode separation corrosion end surface formed by a corrosion treatment described later (hereinafter, the fourth negative electrode end surface is referred to as negative electrode separation corrosion end surface 15f).
Furthermore, the separator 19 is also in the shape of a band and is made of a synthetic fiber nonwoven fabric that can contain an electrolytic solution.

  Then, the positive electrode plate 11, the negative electrode plate 14, and the separator 19 are wound to form a flat wound body 500 as shown in FIG. Thereafter, as shown in FIG. 3, the positive electrode metal foil 12 is welded to the positive electrode current collector 17, and the negative electrode metal foil 15 is welded to the negative electrode current collector 18 to obtain the power generation element 10. Further, the positive current collecting member 17 is electrically connected to the positive terminal member 40, and the negative current collecting member 18 is electrically connected to the negative terminal member 50 (see FIG. 3).

Next, the battery 1 according to the first embodiment will be described with reference to the battery cross-sectional view of FIG.
The battery 1 according to the first embodiment includes a power generation element 10, a battery case body 30, a positive electrode terminal member 40, a negative electrode terminal portion 50, a sealing lid 60, a safety valve 70, and an insulating portion 80, and a wound lithium ion secondary. It is a battery.
The battery case body 30 is a bottomed rectangular container made of metal and having an open top. Further, the positive electrode terminal member 40 and the negative electrode terminal portion 50 respectively protrude through the sealing lid 60, and an insulating portion 80 is interposed between the sealing lid 60 and the positive terminal member 40 and the negative electrode terminal portion 50. The sealing lid 60 includes a safety valve 70 on the upper surface thereof, is disposed with the opening of the battery case body 30 closed, and surrounds the power generation element 10 together with the battery case body 30 in a liquid-tight manner.

  As shown in FIG. 4, in the battery 1 according to the first embodiment, the power generation element 10 includes a positive electrode plate 11 and a negative electrode plate 14 that are wound through a separator 19. It is structured. And the part which follows the 3rd positive electrode end surface 12e among the positive electrode metal foil 12 of the positive electrode plate 11 is mutually piled up outside the separator 19, and is crimped to the positive electrode current collection member 17, and is welded. Similarly, the portion along the third negative electrode end face 15 e of the negative electrode metal foil 15 of the negative electrode plate 14 is overlapped with the outside of the separator 19 on the side opposite to the positive electrode current collector 17 and caulked by the negative electrode current collector 18. Welded.

By the way, as shown in FIG. 5A, the negative electrode separation corrosion end face 15f of the negative electrode metal foil 15 in the negative electrode plate 14 in the battery 1 is viewed in the thickness direction DW15 of the negative electrode metal foil 15, The positive electrode plate 11 is disposed at a position through the separator 19. For this reason, if a large-sized burr or the like is generated on the negative electrode separation corrosion end face 15f, there is a possibility that the separator 19 penetrates and contacts the positive electrode plate 11 (positive metal foil 12) and short-circuits.
However, the negative electrode separation corrosion end face 15f has a maximum protrusion height H4 from the second main surface 15b of the negative electrode metal foil 15 to the separator 19 side in the thickness direction DW15 by the corrosion treatment described later. Less than TH19 (H4 <TH19). Therefore, in the battery 1 of Embodiment 1 including such a power generation element 10, the burr and the like 15 fn of the negative electrode separation corrosion end surface 15 f penetrates the separator 19 and contacts the positive electrode plate 11 (positive metal foil 12). The occurrence of an internal short circuit can be suppressed.

Further, as shown in FIG. 5B, in the battery 1, in the positive electrode plate 11, when the positive electrode separation corrosion end surface 12f of the positive electrode metal foil 12 is viewed in the thickness direction DW12 of the positive electrode metal foil 12, The negative electrode plate 15 is disposed at a position through the separator 19. For this reason, if a large-sized burr or the like is generated on the positive electrode separation corrosion end face 12f, the negative electrode plate 15 (negative electrode metal foil 16) may be pierced through the separator 19 and short-circuited.
However, this positive electrode separation corrosion end surface 12f has a maximum protrusion height H2 from the second main surface 12b of the positive electrode metal foil 12 to the separator 19 side in the thickness direction DW12 by the corrosion treatment described later. Less than TH19 (H2 <TH19). Therefore, in the battery 1 of the first embodiment including such a power generation element 10, burrs or the like 12fn of the positive electrode separation corrosion end face 12f penetrate the separator 19 and come into contact with the negative electrode plate 15 (negative electrode metal foil 16). The occurrence of an internal short circuit can be suppressed.

Further, as described above, since the positive electrode plate 11 of the first embodiment has one positive electrode separation corrosion end face 12f on the positive metal foil 12, the release of burrs and the like 12fn from the positive electrode separation corrosion end face 12f is suppressed. be able to. Therefore, if this positive electrode plate 11 is used in the battery 1, the occurrence of internal short circuit in the battery 1 due to burrs 12fn released from the positive metal foil 12 is reduced.
Similarly, since the negative electrode plate 14 of Embodiment 1 has one negative electrode separation corrosion end face 15f on the negative electrode metal foil 15, it is possible to suppress the liberation of burrs and the like 15fn from the negative electrode separation corrosion end face 15f. The occurrence of an internal short circuit in the battery 1 using the negative electrode plate 14 is reduced.

Next, manufacture of the positive electrode plate 11 of Embodiment 1 will be described with reference to FIGS.
6A is a perspective view of the large-sized positive electrode plate 21, FIG. 6B is a side view of the large-sized positive electrode plate 21, and FIG. 6C is an explanatory view showing a state in which the large-sized positive electrode plate 21 is cut into two. .
The large positive electrode plate 21 includes a strip-shaped large positive metal foil 22 having a first large positive main surface 22a and a second large positive main surface 22b parallel to the first large positive main surface 22a, and a first large positive main surface 22a and a second large positive electrode. Each of the main surfaces 22b is provided with two positive electrode active material layers (first positive electrode active material layer 13a and second positive electrode active material layer 13b) which are coated at intervals.

  First, a portion of the large positive electrode plate 21 located on the large positive metal foil 22 between the adjacent first positive electrode active material layer 13a and the second positive electrode active material layer 13b, that is, FIG. ) Is cut by a cutting device (not shown) using a cutting blade. Then, as shown in FIG.6 (c), the two non-corrosion positive electrode plates 11n which have the positive electrode separation cutting end surface 12fb are obtained. This non-corrosive positive electrode plate 11n is different from the above-mentioned positive electrode plate 11 (FIG. 1) having the separated corrosion end surface 12f in that it has a positive electrode separated cut end surface 12fb formed by cutting.

  Similarly, for the negative electrode plate 14 of the first embodiment, first, a non-corrosive negative electrode plate 14n is obtained. That is, first, a large negative electrode plate 24 is prepared. The large negative electrode plate 24 includes a strip-shaped large negative metal foil 25 having a first large negative electrode main surface 25a and a second large negative electrode main surface 25b, and two negative electrode active material layers (first negative electrode active material layer 16a). And a second negative electrode active material layer 16b). Among the large-sized negative electrode plates 24, on the large-sized negative electrode metal foil 25, located between the adjacent first negative electrode active material layer 16a and the second negative electrode active material layer 16b, in FIG. The cutting planned portion 25 cp shown is cut by a cutting device (not shown) using a cutting blade. Then, as shown in FIG.6 (c), the two non-corrosion negative electrode plates 14n which have negative electrode separation cutting end surfaces 15fb are obtained. This non-corrosive negative electrode plate 14n is different from the above-described negative electrode plate 14 (FIG. 1) having the separated corrosion end face 15f in that it has a negative electrode separated cut end face 15fb formed by cutting.

An end surface corrosion process (separate end surface corrosion process) in manufacturing the positive electrode plate 11 will be described.
FIG. 7A is a partially enlarged perspective view of the positive electrode separation cut end surface 12fb of the non-corrosive positive electrode plate 11n (D portion in FIG. 6C), and FIG. 7B is a portion of the non-corrosive positive electrode plate 11n. An enlarged side view, FIG. 7C, is a partially enlarged sectional view of the non-corrosive positive electrode plate 11n. 9A is a partially enlarged perspective view of the positive electrode separation corrosion end face 12f of the positive electrode plate 11 after the corrosion treatment, FIG. 9B is a partially enlarged side view of the positive electrode plate 11, and FIG. ) Is a partial enlarged cross-sectional view of the positive electrode plate 11.
As shown in FIG. 7, burrs or the like 12 fbn are generated on the positive electrode separation cut end face 12 fb by cutting. Depending on the conditions at the time of cutting, the maximum protrusion height H1 of the burr 12fbn from the second positive electrode main surface 12b when viewed in the thickness direction DW12 of the positive electrode metal foil 12 is greater than the separator thickness TH19. Something big can happen. Therefore, a corrosion treatment using a corrosive agent 400 (aqua regia in the first embodiment) is applied to the positive electrode separation cut end face 12fb for a predetermined time. Specifically, as shown in each drawing of FIG. 8, the positive electrode separation cut end face 12 fb is immersed in the corrosive agent 400. At this time, it is preferable that the positive electrode first active material layer 13 a and the positive electrode second active material layer 13 b do not touch the corrosive agent 400. As a result, as shown in FIGS. 9A and 9B, the positive electrode plate 11 having the positive electrode separation corrosion end face 12f having the maximum protrusion height H2 when viewed in the thickness direction DW12 of the positive electrode metal foil 12 is obtained. . Since the positive electrode plate 11 has been subjected to the above-described corrosion treatment, the maximum protrusion height H2 at the positive electrode separation corrosion end face 12f is significantly smaller than the maximum protrusion height H1 before the treatment, and is greater than the thickness TH19 of the separator 19. Is also getting smaller.

  When the above-mentioned corrosion treatment is applied to the positive electrode separation cut end face 12fb (see FIG. 7) of the non-corrosive positive electrode plate 11n for a longer time, as shown in FIG. Positively spaced corrosion end face 12fm that can be completely dissolved and removed, and when viewed in the thickness direction DW12 of the positive electrode metal foil 12, no burr or the like protrudes from the second main surface 12b (maximum protruding height H2 = 0). Can also be formed.

Next, an end surface corrosion process (separate end surface corrosion process) in manufacturing the negative electrode plate 14 will be described.
FIG. 7A is a partially enlarged perspective view of the negative electrode separation cut end surface 15fb of the non-corrosive negative electrode plate 14n (D portion in FIG. 6C), and FIG. 7B is a portion of the non-corrosive negative electrode plate 14n. An enlarged side view, FIG. 7C, is a partially enlarged sectional view of the non-corrosive negative electrode plate 14n. 9 (a) is a partially enlarged perspective view of the negative electrode separation corrosion end face 15f of the negative electrode plate 14 after the corrosion treatment, FIG. 9 (b) is a partially enlarged side view of the negative electrode plate 14, and FIG. 9 (c). ) Is a partial enlarged cross-sectional view of the negative electrode plate 14.
As shown in FIGS. 7A and 7B, burrs or the like 15fbn are generated on the negative electrode separation cut end face 15fb by cutting. Depending on the conditions at the time of cutting, the maximum protrusion height H3 of the burr 15fbn from the second negative electrode main surface 15b when viewed in the thickness direction DW15 of the negative electrode metal foil 15 is larger than the thickness TH19 of the separator 19. Things can happen. Therefore, as shown in each drawing of FIG. 8, a corrosion treatment is performed in which the negative electrode separation cut end face 15 fb is immersed in a corrosive agent 400 which is aqua regia. At this time, it is preferable that the negative electrode first active material layer 16 a and the negative electrode second active material layer 16 b do not touch the corrosive agent 400. As a result, as shown in each drawing of FIG. 9, the negative electrode plate 14 having the negative electrode separation corrosion end face 15f whose maximum protrusion height is H4 when viewed in the thickness direction DW15 of the negative electrode metal foil 15 is obtained. . Since this negative electrode plate 14 is also subjected to the above-described corrosion treatment, the maximum protrusion height H4 at the negative electrode separation corrosion end face 15f is significantly smaller than the maximum protrusion height H3 before the treatment, and is smaller than the separator thickness TH19. It has become.

  When the above-described corrosion treatment is applied to the negative electrode separation cut end face 15fb (see FIG. 7) of the non-corrosive negative electrode plate 14n for a longer time, as shown in FIG. Formed is a negative electrode separation corrosion end face 15fm that can be completely dissolved and removed and is not protruded from the second main surface 15b (maximum protruding height H4 = 0) when viewed in the thickness direction DW15 of the negative electrode metal foil 15. You can also.

In the separated end face corrosion process (end face corrosion process) described above, corrosion treatment is performed on the positive electrode separated cut end face 12fb before the positive electrode separated corrosion end face 12f, and the generated burrs 12fbn are reduced or removed. Therefore, the release of burrs and the like 12fbn from the positive electrode separation corrosion end face 12f can be suppressed. Similarly, the negative electrode plate can also be subjected to corrosion treatment on the negative electrode separation cut end surface 15fb before the negative electrode separation corrosion end surface 15f, and the generated burrs and the like 15fbn can be reduced or removed. The liberation of burrs and the like 15fbn from the negative electrode separation corrosion end face 15f can be suppressed.
Therefore, in the battery 1 of the first embodiment using the positive electrode plate 11 and the negative electrode plate 14 of the first embodiment, one of the end faces is the positive electrode separation corrosion end face 12f and the negative electrode separation corrosion end face 15f. Further, the possibility that the burrs 12 fbn and 15 fbn are separated from the positive electrode metal foil 12 and the negative electrode metal foil 15 to cause a short circuit inside the battery 1 can be reduced.
Further, the positive electrode first active material layer 13a and the positive electrode second active material layer 13b, and the positive electrode separation cut end surface 12fb and the negative electrode separation cut end surface 15fb separated from the negative electrode first active material layer 16a and the negative electrode second active material layer 16b are provided. Since it was corroded, the positive electrode first active material layer 13a, the positive electrode second active material layer 13b, and the negative electrode first active material layer 16a and the negative electrode second active material layer 16b are suppressed or eliminated from being affected by the corrosion treatment. It is possible.
Except for the production of the positive electrode plate 11 and the negative electrode plate 14, the production of the battery 1 may be performed by a known method, and thus the description thereof is omitted.

(Modification 1)
Next, Modification 1 of the method for manufacturing the positive electrode plate 11 and the negative electrode plate 14 according to Embodiment 1 will be described with reference to FIGS. 11 and 12.
A large positive electrode plate 21 shown in FIG. 11A includes a strip-shaped large positive metal foil 22 having a first large positive electrode main surface 22a and a second large positive electrode main surface 22b parallel thereto, and a first large positive electrode main surface. Each of 22a and the second large-format positive electrode main surface 22b includes two positive electrode active material layers (first positive electrode active material layer 13a and second positive electrode active material layer 13b) which are coated with a space therebetween. . Of the large positive electrode plate 21, on the large positive metal foil 22, the portion located between the adjacent first positive electrode active material layer 13a and the second positive electrode active material layer 13b, that is, in FIG. Let the site | part shown with a dashed-dotted line be the cutting | disconnection plan site | part 22cp.

In the first modification, first, the large positive electrode plate 21 is different from that in the first embodiment, and as shown in FIG. 11B, the first large positive electrode main surface 22a with the planned cutting portion 22cp as the bending position. It is bent into a V shape so that they face each other, and a bent large positive electrode plate 21b is obtained.
Next, as shown in FIG. 12 (a), the portion to be cut 22cp of the bent large-sized positive electrode plate 21b is immersed in a corrosive agent 400, and the portion to be cut 22cp is dissolved to be bent large-sized positive electrode plate. 21b is divided into two. By this corrosion cutting step, a positive electrode plate 11m having a positive electrode separation corrosion end face 12fm (maximum protruding height H2 = 0) shown in FIG. 10 is produced.

  The production of the negative electrode plate 14 according to the first modification is also substantially the same as the production of the positive electrode plate 11, and the large negative electrode plate 24 shown in FIG. 11A includes a first large negative electrode main surface 25a and the same. Are coated on the strip-shaped large negative electrode metal foil 25 having a second large negative electrode main surface 25b parallel to the first large negative electrode main surface 25b and the second large negative electrode main surface 25b with a space therebetween. Two negative electrode active material layers (first negative electrode active material layer 16a, second negative electrode active material layer 16b). In the large-sized negative electrode plate 24, on the large-sized negative electrode metal foil 25, a portion located between the adjacent first negative electrode active material layer 16a and the second negative electrode active material layer 16b, that is, in FIG. Let the site | part shown with a dashed-dotted line be the cutting | disconnection planned site | part 25cp.

First, as shown in FIG. 11B, the large negative electrode plate 24 is bent into a V shape so that the first large negative electrode main surface 25a faces each other with the planned cutting portion 25cp as a bending position. The negative electrode plate 24b is used.
Next, as shown in FIG. 12 (a), a portion to be cut 25cp of the bent large negative electrode plate 24b is immersed in a corrosive agent 400, and the portion to be cut 25cp is dissolved to be bent large negative electrode plate. 24b is divided into two. By this corrosion cutting step, a negative electrode plate 14m having a negative electrode separation corrosion end face 15fm (maximum protruding height H4 = 0) shown in FIG. 10 is produced.

  In this way, in the corrosion cutting step, when the large positive electrode foil 21 is cut at the planned cutting portion 22cp, and the end face of the cut positive metal foil 12 is the above-described positive electrode separation corrosion end face 12fm, this positive electrode separation corrosion end face Burr etc. hardly occur at 12fm. Therefore, it is difficult for burrs or the like to be separated from the positive electrode separation corrosion end face 12fm. The same applies to the negative electrode plate 14m. Therefore, even when the positive electrode plate 11m and the negative electrode plate 14m according to the first modification are used in the battery 101 (see FIG. 3), burrs and the like generated on the positive electrode separation corrosion end surface 12fm and the negative electrode separation corrosion end surface 15fm are generated. Further, it is possible to prevent the short circuit due to contact with the different electrode plates 14 and 11 through the separator 19. In addition, the possibility of causing a short circuit inside the battery 101 by being separated from the positive electrode separation corrosion end face 12fm and the negative electrode separation corrosion end face 15fm of the positive electrode metal foil 12 and the negative electrode metal foil 15 can be reduced.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIGS.
The first embodiment is different from the first embodiment in that the first positive electrode end surface 212c of the positive electrode plate according to the second embodiment and the first negative electrode end surface 215c of the negative electrode plate are common corrosion end surfaces.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified, but similar functions and effects will occur for similar parts. In addition, the same contents are described with the same numbers.

  The strip-shaped positive electrode plate 211 (see FIG. 1) according to the second embodiment is disposed on the positive electrode metal foil 212 and the positive electrode first main surface 212a and the positive electrode second main surface 212b of the positive electrode metal foil 212. The positive electrode active material layer 13a is provided. Of the positive electrode metal foil 212, the first positive electrode end surface (positive electrode common metal foil end surface) 212c and the positive electrode active material layer end surface 13c of the positive electrode active material layer 13a form a common positive electrode common electrode plate end surface 211c. . Moreover, the first positive electrode end face (positive electrode common metal foil end face) 212c is a positive electrode common corrosion end face which is a corrosion end face. That is, the first positive electrode end surface 212c is a corrosion end surface formed by a corrosion treatment among the end surfaces of the positive electrode metal foil 212, and together with the positive electrode active material layer end surface 13c of the positive electrode active material layer 13a, the positive electrode metal foil. 212 is a common end surface formed with a positive electrode common electrode plate end surface 211c (hereinafter, the first positive electrode end surface 212c is also referred to as a positive electrode common corrosion end surface 212c).

  Similarly to the positive electrode plate 211, the negative electrode plate 214 includes the negative electrode metal foil 215 and the negative electrode active material layer 16a on the negative electrode main surfaces 215a and 215b of the negative electrode metal foil 215. Of the negative electrode metal foil 215, the first negative electrode end surface (negative electrode common metal foil end surface) 215c and the negative electrode active material layer end surface 16c of the negative electrode active material layer 16a form a common negative electrode common electrode plate end surface 214c. The first negative electrode end surface (negative electrode common metal foil end surface) 215c is a negative electrode common corrosion end surface which is a corrosion end surface. That is, the first negative electrode end surface 215c is a corrosion end surface formed by the corrosion treatment, and forms the negative electrode common electrode plate end surface 214c of the negative electrode metal foil 215 together with the negative electrode active material layer end surface 16c of the negative electrode active material layer 16a. (Hereinafter, the first negative electrode end surface 215c is also referred to as a negative electrode common corrosion end surface 215c).

Next, the battery 201 according to the second embodiment will be described with reference to FIGS.
The power generation element 210 of the battery 201 is formed by winding a belt-like positive electrode plate 211 and a negative electrode plate 214 through the same belt-like separator 19. In FIG. 13, K portion is a winding end portion. An enlarged cross-sectional view of the K portion is shown in FIG.

In this battery 201, the end face where the negative electrode plate 214 is present in the thickness direction DW 212 of the positive electrode metal foil 212 through the separator 19 among the end faces of the positive electrode metal foil 212 of the positive electrode plate 211 in the K portion is described above. This is the positive electrode common corrosion end face 212c. Further, in this positive electrode common corrosion end face 212c, the size of the burr etc. 212cn, that is, the maximum protrusion height H6 in the thickness direction DW212 from the surface of the first positive electrode main surface 212a is less than the thickness TH19 of the separator 19. It has become.
This is because the positive electrode common corrosion end face 212c is subjected to corrosion treatment as will be described later. Therefore, in the battery 201 of the second embodiment, burrs and the like 212cn existing on the positive electrode common corrosion end face 212c penetrate the separator 19 and come into contact with the negative electrode plate 214 (negative electrode metal foil 215), thereby generating an internal short circuit. Can be suppressed.
Furthermore, in the positive electrode plate 211, release of burrs 212cn and the like from the positive electrode common corrosion end face 212c can be suppressed. Therefore, the battery 201 using the positive electrode plate 211 can also reduce the occurrence of an internal short circuit of the battery 201 due to burrs or the like released from the positive electrode metal foil 212.

Among the batteries 201 according to the second embodiment, the negative electrode plate 214 also includes the positive electrode plate 211 via the separator 19 in the thickness direction DW215 of the negative electrode metal foil 215 in the end portion of the negative electrode metal foil 215 at the K portion. The end face on which the metal exists is the negative electrode common corrosion end face 215c described above. Furthermore, in this negative electrode common corrosion end face 215c, the maximum protrusion height H8 in the thickness direction DW215 from the first negative electrode main face 215a is less than the thickness TH19 of the separator 19.
This is because the negative electrode common corrosion end face 215c is subjected to corrosion treatment as will be described later. Therefore, in this battery 201, the occurrence of an internal short circuit caused by the burr 215cn existing on the negative electrode common corrosion end face 215c penetrating the separator 19 and contacting the positive electrode plate 211 (positive metal foil 212) is suppressed. Can do.
Further, the negative electrode plate 214 can also suppress the release of burrs and the like 215cn from the negative electrode common corrosion end face 215c. Therefore, the battery 201 using the negative electrode plate 214 can also reduce the occurrence of an internal short circuit of the battery 201 due to burrs or the like released from the negative electrode metal foil 215.

Next, a method for manufacturing the positive electrode plate 211 of the second embodiment will be described.
In the manufacturing method of the positive electrode plate 211 according to the second embodiment, the large positive electrode plate 221 (the large positive metal foil 222 and the large positive electrode active material layer 223a) is cut prior to the aforementioned end surface corrosion step, A cutting step for forming the positive electrode common cutting electrode plate end surface 211cb is performed.

First, the above-described cutting process will be described with reference to FIG. Of these, FIG. 15A shows the large positive electrode plate 221 to be cut, and FIG. 15B shows a state where the large positive electrode plate 221 is cut off at a planned cutting site 222cp with a cutting device (not shown). Show.
In the large positive electrode plate 221 shown in FIG. 15A, a large positive electrode active material layer 223a is disposed on each of the large first positive electrode main surface 222a and the large second positive electrode main surface 222b. Further, the large-sized positive electrode plate 221 has a long strip shape including a plurality of positive electrode plates 211 used for the wound body of the battery 201 in the longitudinal direction DL. Therefore, if the cutting device 222cp extending in the short direction DS of the large-sized positive electrode plate 221 is cut with a cutting device (not shown) as shown in FIG. 15A, the positive electrode plate 211n before the corrosion treatment is obtained. . The positive electrode active material layer end surface 13c and the positive electrode common cut metal foil end surface 212cb formed by cutting together form a positive electrode common cut electrode plate end surface 211cb.

Next, an end surface corrosion process in manufacturing the positive electrode plate 211 will be described.
As shown in FIG. 16, burrs 212cbn or the like are generated on the positive electrode common cut metal foil end face 212cb by cutting. Depending on the conditions at the time of cutting, the maximum protruding height H5 of the burr etc. 212cbn from the first positive electrode main surface 212a when viewed in the thickness direction DW212 of the positive electrode metal foil 212 is greater than the thickness TH19 of the separator 19 It can also be large.

Therefore, the positive electrode common cut metal foil end face 212cb is subjected to a corrosion treatment using a corrosive agent 400 for a predetermined time. Specifically, as shown in each drawing of FIG. 17, the positive electrode common cutting electrode plate end surface 211 cb is brought into contact with the corrosive agent 400. Accordingly, as shown in each drawing of FIG. 18, when viewed in the thickness direction DW212 of the positive electrode metal foil 212, the positive electrode plate 211 including the positive electrode common corrosion end surface 212c having the maximum protrusion height H6 (FIG. 1). Reference) is obtained. In the positive electrode plate 211, the maximum protrusion height H6 at the positive electrode common corrosion end face 212c is significantly smaller than the maximum protrusion height H5 before the treatment and smaller than the thickness TH19 of the separator 19 by the above-described corrosion treatment. Yes.
In addition, about the above-mentioned positive electrode common cut metal foil end surface 212cb, when the corrosion treatment is performed for a longer time, the burr and the like generated by the cutting are completely dissolved and removed (maximum protrusion height H6 = 0). It can also be 212c.

Next, a manufacturing method of the negative electrode plate 214 of the second embodiment will be described.
Also in the manufacturing method of the negative electrode plate 214 according to the second embodiment, the large negative electrode plate 224 (the large negative electrode metal foil 225 and the large negative electrode active material layer 223a) is cut prior to the end surface corrosion step, and the common negative electrode common cut is performed. A cutting step for forming the electrode plate end surface 211cb is performed.

First, the above-described cutting process will be described with reference to FIG. 15A shows a large negative electrode plate 224 to be cut, and FIG. 15B shows a state in which the large negative electrode plate 224 is cut at a planned cutting site 225cp with a cutting device (not shown). Show.
The large-sized negative electrode plate 224 can be obtained as a negative electrode plate 214n before corrosion treatment by cutting a planned cutting portion 225cp parallel to the short direction DS in a cutting process. A negative electrode common cut electrode plate end face 214cb is formed together with the negative electrode active material layer end face 16c formed by cutting and the negative electrode common cut metal foil end face 215cb.

Next, an end surface corrosion process in manufacturing the negative electrode plate 214 will be described.
Burrs and the like 215cbn are generated by cutting on the negative electrode common cut metal foil end face 215cb (see FIG. 16). Further, depending on the cutting conditions, the maximum protrusion height H7 of the burr 215cbn may be larger than the thickness TH19 of the separator 19.

Therefore, the negative electrode common cut metal foil end face 215cb is subjected to a corrosion treatment using a corrosive agent 400 for a predetermined time in the same manner as the positive electrode common cut metal foil end face 212cb (see FIG. 17). Thereby, as shown in each figure of FIG. 18, the negative electrode plate 214 (refer FIG. 1) provided with the negative electrode common corrosion end surface 215c whose maximum protrusion height is H8 is obtained. In the negative electrode plate 214, the maximum protrusion height H8 at the negative electrode common corrosion end face 215c is significantly smaller than the maximum protrusion height H7 before the treatment and smaller than the thickness TH19 of the separator 19 by the above-described corrosion treatment. Yes.
If the above-mentioned negative electrode common cut metal foil end face 215cb is subjected to a corrosion treatment for a longer time, the generated burrs and the like can be completely removed.

As described above, in the manufacturing method of the positive electrode plate 211 of the second embodiment, the positive electrode common cut metal foil end surface 212cb is formed in the cutting step performed prior to the end surface corrosion step. However, the positive electrode plate 211 ( The burrs 212cbn generated in the positive electrode metal foil 212) can be reduced or removed. Thus, when the positive electrode plate 211 manufactured according to the second embodiment is used for the battery 201, the end face of the positive electrode metal foil 212 is used as the positive electrode common corrosion end face 212c. By separating from the end face 212c) or penetrating the separator 19, the possibility of causing a short circuit inside the battery 201 can be reduced.
Similarly, in the manufacturing method of the negative electrode plate 214 of the second embodiment, the negative electrode common cut metal foil end face 215cb is formed in the cutting process, but the generated burrs 215cbn can be reduced or removed by the end face corrosion process. . Thus, when this negative electrode plate 214 is used in the battery 201, the end face of the negative electrode metal foil 215 is the negative electrode common corrosion end face 215c, so that burrs and the like are separated from the end face (negative electrode common corrosion end face 215c). Alternatively, by penetrating the separator 19, the possibility of causing an internal short circuit of the battery 201 can be reduced.

(Modification 2)
Next, a second modification regarding the method for manufacturing the positive electrode plate 211 and the negative electrode plate 214 according to the second embodiment will be described with reference to FIGS.
In the method for manufacturing the positive electrode plate 211 and the negative electrode plate 214 according to the second modification, the large-size electrode plate is cut by the corrosive liquid sprayed at a high speed, and a corrosion cutting step for corroding the end face of the metal foil is provided. This is different from the second embodiment.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified, but similar functions and effects will occur for similar parts. In addition, the same contents are described with the same numbers.

Of the manufacturing method of the positive electrode plate 211 according to the second modification, the corrosion cutting step will be described.
As described above, the large positive electrode plate 221 is formed on the large positive metal foil 222 having the first large positive electrode main surface 222a and the second large positive electrode main surface 222b, and on the large positive electrode main surfaces 222a and 222b. A large positive electrode active material layer 223a. In the corrosion cutting process of the second modification, the corrosive liquid 400 is sprayed at a high speed to cut the large positive electrode plate 221, and the end face 212 c formed by cutting the positive metal foil 212 is corroded. To do.

Specifically, the cutting expected part 222cp of the large-sized positive electrode plate 221 (see FIG. 15A) is cut by the water jet device 900 (see FIG. 19).
In the water jet apparatus 900, an arm portion 903 extends from a main body (not shown) above a large-sized positive electrode plate 221, and a nozzle head portion 901 is provided at the tip of the arm portion 903. And this nozzle head part 901 has the nozzle 902 which injects the liquid corrosive agent 400 (aqua regia in this modification 2) toward the cutting plan site | part 222cp of the large format positive electrode plate 221 at high pressure.

  In the positive electrode plate 211 formed by such cutting, when the positive metal foil 212 is viewed, even if a burr or the like is generated on the end surface 212c, for example, a small burr or the like 212cn (specifically, as shown in FIG. 18) Is the burr etc. 212 cn) where the maximum protrusion height H6 is smaller than the thickness TH19 of the separator 19. This is because the water pressure of the water jet device 900 causes a burr immediately after cutting, for example, even if a burr having a large maximum protrusion height H5 (H5> TH19) as shown in FIG. This is because it is corroded by the corrosive agent 400 remaining on the end face, and is eventually removed or becomes a small burr 212cn (H6 <TH19) having a maximum protruding height H6.

Next, the corrosion cutting process of the negative electrode plate 214 will be described.
As described above, the large negative electrode plate 224 is disposed on the large negative electrode metal foil 225 having the first large negative electrode main surface 225a and the second large negative electrode main surface 225b, and the large negative electrode main surfaces 225a and 225b. A large negative active material layer 226a. In the corrosion cutting process according to the second modification, the corrosive liquid 400 is sprayed at a high speed to cut the large-sized negative electrode plate 224, and the end face 215c formed by cutting the negative electrode metal foil 215 is corroded. To do.
Specifically, the planned cutting portion 225cp of the large-sized negative electrode plate 224 (see FIG. 15A) is cut by the water jet device 900 (see FIG. 19).

  Even in the negative electrode plate 214 formed by such cutting, when the negative electrode metal foil 215 is viewed, even if a burr or the like is generated on the end face 215c, for example, a small burr or the like 215cn as shown in FIG. Is a burr 215 cn) in which the maximum protrusion height H8 is smaller than the thickness TH19 of the separator 19. This is because the water pressure of the water jet device 900 causes a burr immediately after cutting, for example, even if a burr having a large maximum protruding height H7 (H7> TH19) as shown in FIG. This is because it is corroded by the corrosive agent 400 remaining on the end face and eventually removed or becomes a small burr or the like 215cn (H8 <TH19) having a maximum protruding height H8.

  As described above, according to the manufacturing method of the second modification, the large positive electrode plate 221 is cut to form the positive electrode plate 211, and the end surface 212c of the positive electrode metal foil 212 of the positive electrode plate 211 is corroded. Therefore, it is not necessary to provide a corrosion process separately from the cutting process, and the process can be simplified. Further, even if a burr or the like occurs on the end surface 212c, it can be reduced. Similarly, the manufacturing method of the negative electrode plate 214 can be reduced by corrosion even if burrs or the like occur on the end face of the negative electrode metal foil 215. Thus, when these electrode plates 211 and 214 are used in the battery 301, the burrs 212cn and 215cn become the metal foils 212 and 215 because the end faces 212c and 215c of the metal foils 212 and 215 are used as the corrosion end faces by this manufacturing method. The possibility of causing a short circuit inside the battery 301 can be reduced by separating from the battery or penetrating the separator 19.

(Embodiment 3)
A vehicle 600 according to the third embodiment uses batteries 1, 101, 201, and 301 manufactured using the positive electrode plates 11 and 211 and the negative electrode plates 14 and 214 described in the first embodiment and the like in a known manner. It is what is installed. Specifically, as shown in FIG. 20, a vehicle 600 according to the third embodiment is a hybrid electric vehicle that is driven by using an engine 610, a front motor 620, and a rear motor 630 together. The vehicle 600 includes a vehicle body 690, an engine 610, a front motor 620, a rear motor 630, a cable 650, an inverter 660, and a battery pack 640 attached thereto. Battery pack 640 is attached to vehicle body 690 of vehicle 600. In the battery pack 640, a plurality of batteries 1 (or batteries 101, 201, 301) are electrically connected in series (not shown).
As described above, since the batteries 1, 101, 201, and 301 are suppressed from occurrence of internal short circuits, in the battery pack 640, and thus the vehicle 600, problems caused by the internal short circuits of the batteries can be reduced. The battery pack 640 and the vehicle 600 can be made highly reliable.

(Embodiment 4)
The notebook personal computer 700 according to the fourth embodiment includes the batteries 1, 101, 201, 301 manufactured using the positive electrode plates 11, 211 and the negative electrode plates 14, 214 shown in the first embodiment. As shown in FIG. 21, a battery-mounted device having a battery pack 710 and a main body 720 is mounted by a known method. The battery pack 710 is accommodated in the main body 720 of the notebook personal computer 700, and a plurality of batteries 1 (or 101, 201, 301) are electrically connected in series inside the battery pack 710 (not shown). Has been placed.
As described above, since the batteries 1, 101, 201, and 301 are suppressed from occurrence of internal short circuits, in the battery pack 710 and thus the notebook personal computer 700, problems caused by internal battery short circuits are reduced. The battery pack 710 and the notebook personal computer 700 can be made highly reliable.

In the above, the present invention has been described with reference to the first to fourth embodiments and the first and second embodiments. However, the present invention is not limited to the above-described embodiments and the like, and can be appropriately changed without departing from the gist thereof. Needless to say, this is applicable.
For example, although the battery is a lithium ion secondary battery as the first embodiment or the like, the present invention is not limited to the lithium ion secondary battery, and any battery having a power generation element using an electrode plate having a metal foil may be used. This type of battery can also be applied.
Moreover, in Embodiment 1 etc., although the example which carry | supported the active material layer on the surface of both the 1st main surface and the 2nd main surface among metal foil of an electrode plate was shown, this invention is 1st main surface. The present invention can also be applied to an electrode plate carrying an active material layer on any one of the second main surfaces.
Furthermore, in Embodiment 1 and Modification 1, one of the two separated end faces of the metal foil provided in the electrode plate is a separated corrosion end face, but both may be separated corrosion end faces. Further, in the first embodiment, an example in which the end face corrosion process and the separated end face corrosion process are matched is shown. It can also be used as a corrosion end face.

  However, if the active material layer touches the corrosive agent, the active material layer may corrode or a side reaction may occur leading to a decrease in the function of the active material layer. It is preferable to perform a corrosion treatment (cutting treatment). Therefore, in consideration of the influence of the corrosive agent on the active material layer and the influence of the remaining corrosive agent on the metal foil, the portion of the metal foil or active material layer where the corrosive agent is attached is immersed in the neutralizing agent, You may perform the process of washing with water.

  In the first embodiment and the like, an example in which the present invention is applied to a battery having a wound power generation element has been described. However, in a stacked battery in which a plurality of positive electrode plates and negative electrode plates are stacked, the present invention can also be applied to one or both of the positive electrode plate and the negative electrode plate.

It is a figure which shows the positive electrode plate (negative electrode plate) concerning Embodiment 1, 2 and modification 1, 2, (a) is a perspective view, (b) is a top view, (c) is a side view. It is a perspective view which shows the winding body concerning Embodiment 1, 2 and modification 1,2. It is a longitudinal cross-sectional view which shows the battery concerning Embodiment 1, 2 and modification 1,2. It is a cross-sectional view (AA cross section of FIG. 3) which shows the battery concerning Embodiment 1 and the modification 1. It is the elements on larger scale of the battery concerning Embodiment 1 and modification 1, (a) is the B section enlarged view of FIG. 4, (b) is the C section enlarged view of FIG. It is a figure which shows the large format positive electrode plate (large format negative electrode plate) concerning Embodiment 1, (a) is a perspective view, (b) is a side view, (c) is a perspective view of a non-corrosion electrode plate. It is the elements on larger scale which show the non-corrosion positive electrode plate (non-corrosion negative electrode board) which has a burr | flash etc. concerning Embodiment 1, (a) is a perspective view, (a) is a perspective view, (b) ) Is a front view, and (c) is an EE cross-sectional view. It is explanatory drawing which shows the mode of the space | interval end surface corrosion process concerning Embodiment 1, (a) is a perspective view which shows the immersion state to a corrosive, (b) is a partial enlarged view (F part enlarged view of (a)) It is. It is the elements on larger scale which show the positive electrode board (negative electrode board) after the space | interval end surface corrosion process concerning Embodiment 1, (a) is a perspective view, (b) is a front view, (c) is GG sectional drawing. It is. It is the elements on larger scale which show the positive electrode board (negative electrode board) at the time of giving the space | interval end surface corrosion process concerning Embodiment 1 long, (a) is a perspective view, (b) is a front view, (c) is H It is -H sectional drawing. It is a figure which shows the large sized positive electrode plate (large sized negative electrode plate) concerning the deformation | transformation form 1, (a) is a perspective view, (b) is a perspective view of a bending large sized positive electrode plate (bending large sized negative electrode plate). It is explanatory drawing which shows the mode of the corrosion cutting process concerning a deformation | transformation form 1, (a) is a perspective view which shows the immersion state to a corrosive, (b) is a partial enlarged view (I part enlarged view of (a)). is there. It is a longitudinal cross-sectional view (JJ cross section of FIG. 3) which shows the battery concerning Embodiment 2 and the modification 2. FIG. FIG. 14 is a partial enlarged cross-sectional view (part K in FIG. 13) of the battery according to the second embodiment and the second modification. It is a figure which shows the large format positive electrode plate (large format negative electrode plate) concerning Embodiment 2, (a) is a perspective view, (b) is a perspective view of a non-corrosion positive electrode plate (non-corrosion negative electrode plate). It is the elements on larger scale which show the non-corrosive electrode board (non-corrosion negative electrode board) which has a burr | flash etc. concerning Embodiment 2 (L part enlarged view of FIG.15 (b)), (a) is a perspective view, (b ) Is a front view, and (c) is an MM cross-sectional view. It is explanatory drawing which shows the mode of the end surface corrosion process concerning Embodiment 2, (a) is a perspective view which shows the immersion state to a corrosive, (b) is a partial enlarged view (the N section enlarged view of (a)). is there. It is the elements on larger scale which show the positive electrode board (negative electrode board) after the end surface corrosion process concerning Embodiment 2, (a) is a perspective view, (b) is a front view, (c) is OO sectional drawing. is there. It is explanatory drawing which shows the mode of the corrosion cutting process concerning the deformation | transformation form 2, (a) is a perspective view during corrosion cutting, (b) is a partial enlarged view (Q part enlarged view of (a)). It is explanatory drawing which shows the vehicle (hybrid electric vehicle) which mounts the battery concerning Embodiment 3, Embodiment 1, 2, the modification 1, or the modification 2. FIG. It is explanatory drawing which shows the notebook-type personal computer (battery mounting apparatus) which mounts the battery concerning Embodiment 4, Embodiment 1, 2, modification 1, or modification 2 concerning Embodiment 4. FIG.

Explanation of symbols

1, 101, 201, 301 Battery 11, 11m, 211 Positive electrode plate (electrode plate)
12,212 Positive electrode metal foil (metal foil)
12a, 212a First positive electrode main surface (first main surface)
12b, 212b Second positive electrode main surface (second main surface)
12c 1st positive electrode end surface (1st end surface)
12d Second positive end face (second end face)
12e Positive electrode separation end face (separation end face)
12f, 12fm Positive electrode separation corrosion end face (separation corrosion end face)
13a Positive electrode first active material layer (active material layer)
13b Positive electrode second active material layer (active material layer)
13c Positive electrode active material layer end face (active material layer end face)
14,14m, 214 Negative electrode plate (electrode plate)
15,215 Negative electrode metal foil (metal foil)
15a, 215a First negative electrode main surface (first main surface)
15b, 215b Second negative electrode main surface (second main surface)
15c 1st negative electrode end surface (1st end surface)
15d Second negative electrode end face (second end face)
15e Negative electrode separation end face (separation end face)
15f, 15fm Negative electrode separation corrosion end face (separation corrosion end face)
16a Negative electrode first active material layer (active material layer)
16b Negative electrode second active material layer (active material layer)
16c Negative electrode active material layer end face (active material layer end face)
19 Separator 21, 221 Large format positive electrode plate (Large size electrode plate)
22,222 large-format positive metal foil (large-format metal foil)
22a, 222a First large-format positive electrode main surface (first large-format main surface)
22b, 222b Second large format positive electrode main surface (second large format main surface)
22cp (Large-size positive metal foil) Planned cutting parts 24,224 Large-size negative electrode plate (Large-size metal foil)
25,225 Large-format negative electrode metal foils 25a, 225a First large-format negative electrode main surface (first large-format main surface)
25b, 225b 2nd large format negative electrode main surface (2nd large format main surface)
25 cp (large-size negative electrode metal foil) planned cutting portion 211 c positive electrode common electrode plate end surface (common electrode plate end surface)
211cb Positive electrode common cutting electrode plate end surface 212c Positive electrode common corrosion end surface (common metal foil end surface)
212cb Positive electrode common cut metal foil end face 214c Negative electrode common electrode plate end face (common electrode plate end face)
214cb corrosion common cut electrode plate end face 215c negative electrode common corrosion end face (common metal foil end face)
215cb Negative electrode common cut metal foil end face 223a Large positive electrode active material layer 226a Large negative electrode active material layer 400 Corrosive (corrosive liquid)
600 Vehicle 700 Notebook personal computer (equipment with battery)
DW12, DW212 Positive metal foil thickness direction DW15, DW215 Negative metal foil thickness direction H2, H6 Maximum protrusion height H4, H8 Maximum protrusion height TH19 Thickness

Claims (15)

An electrode plate comprising a metal foil having a first main surface and a second main surface parallel to the first main surface,
The metal foil has at least one end surface connecting the first main surface and the second main surface,
At least one of the end faces is an electrode plate formed as a corroded end face subjected to a corrosion treatment. The electrode plate according to claim 1,
An active material layer disposed on at least one of the first main surface and the second main surface;
The end face includes at least one separated end face that is separated from the active material layer,
At least one of the separation end surfaces is an electrode plate formed as a separation corrosion end surface which is the corrosion end surface. The electrode plate according to claim 1,
An active material layer disposed on at least one of the first main surface and the second main surface;
At least one of the end surfaces is a common metal foil end surface that forms a common electrode plate end surface in common with the active material layer end surface of the active material layer,
An electrode plate in which at least one of the common metal foil end faces is a common corrosion end face which is the corrosion end face. Positive electrode plate,
A negative electrode plate, and
A battery comprising a separator interposed between the positive electrode plate and the negative electrode plate,
The battery in which at least one of the positive electrode plate and the negative electrode plate is an electrode plate according to any one of claims 1 to 3. The battery according to claim 4,
The electrode plate is the electrode plate according to claim 2,
Among the end faces of the metal foil, the end face where other electrode plates with different potentials exist through the separator in the thickness direction of the metal foil is the spaced corrosion end face,
The spacing corrosion end surface has a maximum protruding height from the separator side surface of the first main surface and the second main surface toward the separator side in the thickness direction less than the thickness of the separator. Battery. The battery according to claim 4,
The electrode plate is the electrode plate according to claim 3,
Of the end faces of the metal foil, in the thickness direction of the metal foil, the end face where other electrode plates with different potentials exist via the separator is the common corrosion end face,
The common corrosion end surface has a maximum protruding height from the separator side surface of the first main surface and the second main surface toward the separator side in the thickness direction is less than the thickness of the separator. Battery. A vehicle equipped with the battery according to any one of claims 4 to 6. The battery mounting apparatus which mounts the battery as described in any one of Claims 4-6. A method for producing an electrode plate comprising a metal foil having a first main surface and a second main surface parallel to the first main surface,
The metal foil has at least one end surface connecting the first main surface and the second main surface,
A method for manufacturing an electrode plate, comprising: an end face corrosion process in which at least one of the end faces is subjected to a corrosion treatment to form a corroded end face. It is a manufacturing method of the electrode plate according to claim 9,
The electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface,
The end face includes at least one separated end face that is separated from the active material layer,
The said end surface corrosion process is a manufacturing method of an electrode plate including the separated end surface corrosion process which uses at least 1 of the said separated end surfaces as the separated corrosion end surface which is the said corrosion end surface. It is a manufacturing method of the electrode plate according to claim 9,
The electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface,
Prior to the end face corrosion step, the metal foil and the active material layer are cut together to form a common common electrode plate end face, and the active material layer end face of the active material layer and the common metal foil end face which is the end face Perform the cutting process to form
The said end surface corrosion process is a manufacturing method of the electrode plate which performs the said corrosion process to the said common metal foil end surface. A method for producing an electrode plate comprising a metal foil having a first main surface and a second main surface parallel to the first main surface,
A large-sized metal foil having a first large-sized main surface and a second large-sized main surface parallel to the first large-sized main surface is obtained, and a portion to be cut of the large-sized metal foil is cut by a corrosion treatment to obtain the electrode plate and formed. The manufacturing method of an electrode plate provided with the corrosion cutting process which makes the end surface of the said metal foil the corrosion end surface to which the said corrosion treatment was performed. It is a manufacturing method of the electrode plate according to claim 12,
The electrode plate includes an active material layer disposed on at least one of the first main surface and the second main surface,
The corrosion cutting step is a large-sized electrode in which a plurality of the active material layers are spaced apart from each other on at least one of the first large-sized main surface and the second large-sized main surface of the large-sized metal foil. About the board
Among the planned cutting sites of the large metal foil, the planned cutting site located between the active material layers is cut by a corrosion treatment to obtain the electrode plate,
The manufacturing method of the electrode plate which makes the end surface of the formed said metal foil spaced apart from the said active material layer, and makes it the separated corrosion end surface which is the said corrosion end surface. A metal foil having a first main surface and a second main surface parallel to the first main surface;
An active material layer disposed on at least one of the first main surface and the second main surface, comprising:
A large metal foil having a first large main surface and a second large main surface parallel to the first large main surface;
A large-sized electrode plate comprising a large-sized active material layer disposed on at least one of the large-sized first main surface and the large-sized second main surface,
A method for producing an electrode plate, comprising a step of cutting the large electrode plate with a corrosive liquid sprayed at a high speed and corroding an end face formed by cutting the metal foil to form a corroded end face. A battery manufacturing method comprising a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate,
The manufacturing method of the battery which forms the electrode plate of at least any one of the said positive electrode plate and a negative electrode plate with the manufacturing method of the electrode plate in any one of Claims 9-14.

Images