JP2007305345A - Positive electrode for battery, its manufacturing method, and battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positive electrode for a battery having a positive electrode substrate containing a resin skeleton made of resin fibers and having a high current collecting property; to provide its manufacturing method; to provide the battery having the positive electrode substrate containing a resin skeleton made of resin fibers; and to provide the manufacturing method of the battery. <P>SOLUTION: The positive electrode 121 (the positive electrode for the battery) is equipped with resin skeleton 121f made of resin fibers 121b; a metal covering layer 121c covering the resin skeleton 121f; and the positive electrode substrate 121k having voids K in which two or more holes are three-dimensionally connected. In the positive electrode substrate 121k, resin fibers 121b constituting the resin skeleton 121f are oriented in the prescribed direction. A positive lead 121r is joined to a crossing peripheral part (a first end part 121t) containing a crossing periphery (a first side 121m) crossing with the orientation direction Y of the resin fibers 121b out of peripheries of the positive electrode substrate 121k. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery positive electrode having a positive electrode substrate including a resin skeleton, a manufacturing method thereof, and a battery including a positive electrode including a resin skeleton.

  In recent years, batteries, in particular alkaline storage batteries, have attracted attention as power sources for portable devices and portable devices, and as power sources for electric vehicles and hybrid vehicles. Various types of such alkaline storage batteries have been proposed. Among them, a positive electrode containing an active material mainly composed of nickel hydroxide, a negative electrode mainly composed of a hydrogen storage alloy, potassium hydroxide, etc. Nickel metal hydride secondary batteries provided with an alkaline electrolyte solution containing hydrogen are rapidly spreading as alkaline storage batteries having high energy density and excellent reliability.

  By the way, the positive electrode of the nickel metal hydride secondary battery is roughly classified into two types, that is, a sintered nickel electrode and a paste type (non-sintered) nickel electrode, depending on the manufacturing method of the electrode. Among these, the sintered nickel electrode is formed by depositing nickel hydroxide into the fine pores of a porous sintered substrate obtained by sintering nickel fine powder on both sides of a perforated steel plate (punching metal) by a solution impregnation method or the like. Produced. On the other hand, a paste-type nickel electrode is produced by directly filling an active material containing nickel hydroxide into pores of a highly porous foamed nickel porous substrate (foamed nickel substrate). Since this paste type nickel electrode has a high packing density of nickel hydroxide and can easily achieve high energy density, it is currently the mainstream of nickel-metal hydride battery positive electrodes (see, for example, Patent Document 1).

JP-A-62-15769 JP-A-8-321303 JP 2001-313038 A

  The foamed nickel substrate used for the paste type nickel electrode is prepared by burning the resin skeleton after nickel plating is applied to the resin skeleton of the foamed polyurethane sheet. By such a method, a nickel substrate having a high porosity can be obtained, and it becomes possible to increase the packing density of nickel hydroxide. However, since a process of burning out the resin skeleton is necessary, there is a problem that the manufacturing cost is high. was there. Moreover, since the strength of the foamed nickel substrate is weak, there is a possibility that the nickel electrode (positive electrode) may expand greatly due to repeated charge and discharge. For this reason, when a nickel electrode expand | swells greatly, a separator will be compressed and the electrolyte solution in a separator will reduce in connection with this, and there existed a possibility of causing a raise of internal resistance and a fall of charging / discharging efficiency.

  In order to solve such a problem, a positive electrode substrate produced by applying nickel plating to a resin skeleton such as a nonwoven fabric without burning the resin skeleton, and a battery using the same have been proposed (Patent Document 2, Patent). Reference 3). By using a positive electrode substrate including a resin skeleton such as a nonwoven fabric, the positive electrode substrate can be strengthened, so that expansion of the positive electrode can be suppressed.

  By the way, as a battery such as a nickel metal hydride storage battery, for example, a battery having an electrode plate group in which a large number of plate-like positive electrodes, separators, and negative electrodes are alternately stacked is known. In this battery, a large number of positive electrodes are welded to a positive electrode current collecting member that collects positive charges. Specifically, the positive electrode has a positive electrode substrate in which the surface of the resin skeleton is subjected to metal plating, and a positive electrode lead made of a metal plate welded to one end of the positive electrode substrate. Is welded to the positive electrode current collector.

  However, when a positive electrode substrate including a resin skeleton made of resin fibers such as non-woven fabric is used as the positive electrode substrate, the current collecting resistance of the positive electrode (the charge in the positive electrode substrate is used as the positive electrode lead) as compared with the case of using the foamed nickel substrate. There was a tendency that the electrical resistance during current collection) increased. In particular, since the degree of ductility between the positive electrode substrate including a resin skeleton and the positive electrode lead made of a metal plate is different, in the process of manufacturing the positive electrode, the positive electrode substrate is subjected to press molding after the positive electrode lead is welded to the positive electrode substrate. The main factor was that stress was concentrated at the boundary of the welded portion between the substrate and the positive electrode lead, and a crack occurred at the boundary of the welded portion. For this reason, there existed a problem that the current collection property of a positive electrode fell (electrical resistance increased). As a result of studies by the present inventors, it has been found that the current collecting property (current collecting resistance) of the positive electrode is closely related to the orientation direction of the resin fibers constituting the resin skeleton and the bonding position of the positive electrode lead.

  The present invention has been made in view of such a situation, and has a positive electrode substrate including a resin skeleton made of resin fibers, and has a good current collecting property, a manufacturing method thereof, and a resin fiber. An object of the present invention is to provide a battery having a positive electrode having a positive electrode substrate containing a resin skeleton and having good current collecting properties.

  The solution includes a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, and a positive electrode substrate having a void portion in which a plurality of holes are three-dimensionally connected. A positive electrode for a battery having a positive electrode active material filled in the gap portion of the positive electrode substrate, and a positive electrode lead made of metal and bonded to a peripheral portion including a part of the peripheral edge of the positive electrode substrate, The positive electrode substrate is formed by orienting the resin fibers constituting the resin skeleton in a predetermined direction, and the positive electrode lead includes a crossing edge including an intersecting peripheral edge intersecting an orientation direction of the resin fiber among peripheral edges of the positive electrode substrate. It is a battery positive electrode bonded to the peripheral edge.

  The positive electrode for a battery of the present invention has a positive electrode substrate including a resin skeleton made of resin fibers and a metal coating layer made of metal and covering the resin skeleton. In this positive electrode substrate, resin fibers constituting the resin skeleton are oriented in a predetermined direction. Furthermore, the positive electrode lead is joined to the crossing peripheral edge part including the crossing peripheral edge which crosses the orientation direction of the resin fiber among the peripheral edges of the positive electrode substrate. Thereby, when collecting the electric charge in the positive electrode substrate to the positive electrode lead, the current can be collected along the alignment direction of the resin fibers (or in a direction close to the alignment direction). It is possible to reduce the electric resistance when collecting electric charges on the positive electrode lead. This is because, in a positive electrode substrate having a resin skeleton made of resin fibers, the electric resistance is reduced in the orientation direction of the resin fibers. Therefore, the positive electrode for a battery of the present invention is a positive electrode for a battery having good current collecting properties.

  In addition, the orientation direction of the resin fiber concerning a positive electrode board | substrate can be measured by a well-known method. For example, an X-ray CT image of a positive electrode substrate and a CT image of a transmission electron microscope are obtained, and based on these images, fiber 3D measurement software, TRI / 3D-VOL-FBR (manufactured by Ratok System Engineering) is used. The orientation direction of the resin fiber can be measured.

  Furthermore, in the positive electrode for a battery described above, the positive electrode substrate has a rectangular sheet shape and has a first side that is the intersecting peripheral edge, and the positive electrode lead is the intersecting peripheral edge portion of the positive electrode substrate. A positive electrode for a battery that is joined to the first end including the first side is preferable.

  In the positive electrode for a battery according to the present invention, the positive electrode substrate has a rectangular sheet shape, and the positive electrode lead corresponds to the first end (corresponding to the intersecting peripheral edge) including the first side (corresponding to the intersecting peripheral edge) of the positive electrode substrate. ). Thereby, when collecting the electric charge in the positive electrode substrate to the positive electrode lead, the current can be collected along the alignment direction of the resin fibers (or in a direction close to the alignment direction), so that the current collecting resistance can be reduced. it can. Therefore, the positive electrode for a battery of the present invention is a positive electrode for a battery having good current collecting properties.

  Further, in any one of the battery positive electrodes, the positive electrode substrate may be a battery positive electrode in which the orientation direction of the fiber resin is orthogonal to the intersecting peripheral edge or the first side.

  In the battery positive electrode of the present invention, the orientation direction of the fiber resin applied to the positive electrode substrate is orthogonal to the intersecting peripheral edge or the first side. Thereby, when the electric charge in the positive electrode substrate is collected on the positive electrode lead, the current can be collected along the orientation direction of the resin fiber, so that the current collecting resistance can be reduced. Therefore, the positive electrode for a battery of the present invention is a positive electrode for a battery excellent in current collecting properties.

  Furthermore, any one of the battery positive electrodes described above may be a battery positive electrode formed by press-molding the positive electrode lead in the thickness direction of the positive electrode substrate after bonding the positive electrode lead to the positive electrode substrate.

  The positive electrode for a battery of the present invention is press-molded in the thickness direction of the positive electrode substrate after the positive electrode lead is bonded to the positive electrode substrate. When press-molding the positive electrode substrate to which the positive electrode lead is bonded, during press molding, due to the difference in the extent of stretching between the positive electrode substrate and the positive electrode lead, stress occurs at the boundary between the positive electrode substrate and the positive electrode lead, There is a risk of cracks occurring at the boundary of the joint.

  On the other hand, in the battery positive electrode of the present invention, as described above, the positive electrode lead is joined to the intersecting peripheral edge portion including the intersecting peripheral edge intersecting with the orientation direction of the resin fiber in the peripheral edge of the positive electrode substrate. Therefore, when viewed in the direction along the surface of the positive electrode substrate (current collection direction), the boundary of the joint portion between the positive electrode substrate and the positive electrode lead is orthogonal or oblique to the orientation direction of the resin fibers. Here, when the positive electrode substrate having a resin skeleton made of resin fibers is subjected to press molding, the positive electrode substrate tends to be stretched particularly in a direction in which the resin fibers constituting the resin skeleton are oriented. In other words, the degree of stretching tends to be small in a direction different from the orientation direction of the resin fibers, particularly in a direction orthogonal to the orientation direction of the resin fibers.

For this reason, when the boundary of the joint portion between the positive electrode substrate and the positive electrode lead is orthogonal or oblique to the orientation direction of the resin fiber, the stretch of the positive electrode substrate is suppressed at the boundary of the joint portion during press molding. Therefore, the difference in the degree of stretching between the positive electrode substrate and the positive electrode lead is reduced. Thereby, since the stress which arises in the boundary of the junction part of a positive electrode board | substrate and a positive electrode lead can be suppressed, and it can suppress that a crack arises in the boundary of a junction part, increase of the current collection resistance by press molding can be suppressed.
As described above, the battery positive electrode according to the present invention has low current collection resistance and good current collection performance despite being subjected to press molding in the thickness direction of the positive electrode substrate after the positive electrode lead is bonded to the positive electrode substrate. It becomes a positive electrode for a battery.

  Another solution includes a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, and a rectangular shape having a cavity in which a plurality of holes are three-dimensionally connected. A battery having a sheet-like positive electrode substrate, a positive electrode active material filled in the gap of the positive electrode substrate, and a positive electrode lead made of metal and bonded to a first end including the first side of the positive electrode substrate The positive electrode substrate is an electric resistance between two points that are equidistant in the positive electrode substrate, and is parallel to the first side and an electric resistance R1 in a direction orthogonal to the first side. The electric resistance R2 applied in a certain direction is a positive electrode for a battery that satisfies the relationship of R1 / R2 <1.0.

In the battery positive electrode of the present invention, the positive electrode lead is bonded to the first end including the first side of the rectangular sheet-like positive electrode substrate. For this reason, the current collecting direction for collecting the charges in the positive electrode substrate to the positive electrode lead is a direction orthogonal to the first side. Furthermore, the positive substrate has an electrical resistance between two points that are equidistant on the positive substrate, and an electrical resistance R1 applied in a direction orthogonal to the first side, and an electrical resistance R2 applied in a direction parallel to the first side However, the relationship of R1 / R2 <1.0 is satisfied. That is, in this positive electrode substrate, the electrical resistance is smaller in the direction perpendicular to the first side than in the direction parallel to the first side.
Therefore, in the positive electrode for a battery according to the present invention, the current collection direction matches the direction in which the electric resistance is small (the direction perpendicular to the first side) in the positive electrode substrate, so the current collection resistance is small and the current collecting property is good. .

Further, in the battery positive electrode, the positive electrode substrate is preferably a battery positive electrode in which the electric resistance R1 and the electric resistance R2 satisfy a relationship of R1 / R2 ≦ 0.5.
In the positive electrode substrate satisfying the relationship of R1 / R2 ≦ 0.5, the electric resistance is particularly reduced in the direction (current collection direction) orthogonal to the first side. For this reason, the positive electrode for a battery having this positive electrode substrate is a positive electrode for a battery having a particularly low current collecting resistance and excellent current collecting property.

  Further, in the positive electrode for a battery described above, the positive electrode substrate has the electric resistance R1 and the electric resistance R2 satisfy a relationship of R1 / R2 ≧ 0.1, and the positive electrode lead is bonded to the positive electrode substrate. Later, a positive electrode for a battery formed by pressing in the thickness direction of the positive electrode substrate may be used.

  In the battery positive electrode of the present invention, the positive electrode lead is bonded to the positive electrode substrate, and then press-molded in the thickness direction of the positive electrode substrate. As described above, when the positive electrode substrate to which the positive electrode lead is bonded is press-molded, the boundary between the positive electrode substrate and the positive electrode lead due to the difference in the extent of stretching between the positive electrode substrate and the positive electrode lead during press molding. There is a risk that stress will occur in the joints and cracks will occur at the boundaries of the joints.

  On the other hand, in the positive electrode substrate of the positive electrode for a battery according to the present invention, the electrical resistance R1 and the electrical resistance R2 satisfy the relationship of 0.1 ≦ R1 / R2 <1.0. In the positive electrode substrate satisfying the relationship of R1 / R2 <1.0, the boundary between the positive electrode substrate and the positive electrode lead in the direction along the surface of the positive electrode substrate (current collection direction) is in the resin fiber orientation direction. It is orthogonal or oblique. For this reason, at the time of press molding, since the stretching of the positive electrode substrate is suppressed at the boundary of the joint portion, the difference in the degree of stretching between the positive electrode substrate and the positive electrode lead is reduced. Thereby, since the stress which arises in the boundary of the junction part of a positive electrode board | substrate and a positive electrode lead can be suppressed, and it can suppress that a crack arises in the boundary of a junction part, increase of the current collection resistance by press molding can be suppressed.

Incidentally, the smaller the value of R1 / R2 of the positive electrode substrate, the better the current collecting property of the positive electrode. However, when the value of R1 / R2 is too small, that is, the strength of the orientation of the resin fibers (direction perpendicular to the first side) If the degree of orientation of the positive electrode substrate is too strong, the electrical resistance of the positive electrode substrate itself is greatly increased by press molding. The reason for this is that, in the case of a positive electrode substrate having a value of R1 / R2 that is too small, resin fibers that extend in a direction parallel to the first side are extremely few, so when press molding is performed, the resin substrate extends in a direction parallel to the first side. This is probably because a part of the resin fiber is greatly stretched or torn and a part of the metal coating layer covering the resin fiber is torn.
On the other hand, the positive electrode for a battery of the present invention uses a positive electrode substrate that satisfies the relationship of R1 / R2 ≧ 0.1. That is, a positive electrode substrate in which the strength of resin fiber orientation is suppressed is used. Thereby, the raise of the electrical resistance of positive electrode board | substrate itself by press molding can be suppressed.
As described above, the battery positive electrode according to the present invention has low current collection resistance and good current collection performance despite being subjected to press molding in the thickness direction of the positive electrode substrate after the positive electrode lead is bonded to the positive electrode substrate. It becomes a positive electrode for a battery.

Furthermore, in any of the battery positive electrodes described above, the positive electrode substrate may be a battery positive electrode including the metal coating layer in a range of 100 g / m ^{2 to} 250 g / m ² .

In the positive electrode for a battery of the present invention, the positive electrode substrate contains a metal coating layer in a range of 100 g / m ^{2 to} 250 g / m ² . By setting the metal coating layer to 100 g / m ² or more, the battery life characteristics can be improved. By making the metal coating layer 250 g / m ² or less, the cost can be suppressed. Therefore, by using the positive electrode for a battery according to the present invention, it is possible to obtain a battery having good life characteristics and inexpensive.

  Furthermore, in any one of the battery positive electrodes described above, the resin skeleton of the positive electrode substrate may be a battery positive electrode that is a nonwoven fabric.

  When manufacturing a nonwoven fabric, the orientation of the resin fibers can be easily adjusted. Therefore, the battery positive electrode of the present invention using a nonwoven fabric as the resin skeleton of the positive electrode substrate has a good current collecting property and is an inexpensive battery positive electrode.

  Another solution is a battery including any one of the battery positive electrodes.

  The battery of the present invention includes any of the battery positive electrodes described above. Therefore, although the positive electrode substrate including the resin skeleton is used as the positive electrode substrate, the battery having a good positive electrode current collecting property is obtained.

  Another solution is a positive electrode having a resin skeleton made of resin fibers and having a three-dimensional network structure and a metal coating layer made of metal and covering the resin skeleton, and a plurality of pores connected in three dimensions. A method for producing a positive electrode for a battery, comprising: a substrate; a positive electrode active material filled in the gap of the positive electrode substrate; and a positive electrode lead formed of a metal and bonded to a peripheral portion including a part of the peripheral edge of the positive electrode substrate. In this case, a positive electrode substrate in which the resin fibers constituting the resin skeleton are aligned in a predetermined direction is used as the positive electrode substrate, and the positive electrode lead is arranged in the orientation direction of the resin fibers in the periphery of the positive electrode substrate. It is a manufacturing method of the positive electrode for batteries provided with the joining process joined to the crossing periphery part containing the crossing periphery which cross | intersects.

In the production method of the present invention, a positive electrode substrate in which resin fibers constituting a resin skeleton are aligned in a predetermined direction is used as the positive electrode substrate, and in the bonding step, the positive electrode lead is aligned with the resin fibers in the periphery of the positive electrode substrate. It joins to the crossing periphery including the crossing periphery that intersects the direction. Thereby, when the electric charge in a positive electrode board | substrate is collected on a positive electrode lead, the positive electrode for batteries which can be collected along the orientation direction of a resin fiber (or the direction close | similar to an orientation direction) can be manufactured. In a positive electrode substrate having a resin skeleton made of resin fibers, the electrical resistance decreases in the orientation direction of the resin fibers. Therefore, the battery positive electrode manufactured by the manufacturing method of the present invention has a low current collection resistance.
Therefore, according to the production method of the present invention, it is possible to obtain a positive electrode for a battery having good current collecting properties.

  Furthermore, in the method for manufacturing a positive electrode for a battery as described above, in the joining step, a positive electrode substrate having a rectangular sheet shape and having a first side that is the intersecting peripheral edge is used as the positive electrode substrate. A method for producing a positive electrode for a battery that is bonded to a first end portion including the first side, which is the intersecting peripheral edge portion of the positive electrode substrate, is preferable.

In the manufacturing method of the present invention, a positive electrode substrate having a rectangular sheet shape and having a first side (corresponding to a crossing periphery) is used as the positive electrode substrate, and the positive electrode lead is included in the bonding step in the bonding step. Joined to the first end (corresponding to the intersecting peripheral edge). Thereby, when the electric charge in a positive electrode board | substrate is collected on a positive electrode lead, the positive electrode for batteries which can be collected along the orientation direction of a resin fiber (or the direction close | similar to an orientation direction) can be manufactured. For this reason, the positive electrode for batteries manufactured by the manufacturing method of the present invention has a small current collecting resistance.
Therefore, according to the production method of the present invention, it is possible to obtain a positive electrode for a battery having good current collecting properties.

  Furthermore, in any one of the above-described methods for producing a positive electrode for a battery, the filling step of filling a positive electrode active material into the gap portion of the positive electrode substrate after the joining step, and the filling of the positive electrode active material. A positive electrode substrate is preferably provided with a pressing step of press-molding the positive electrode substrate in the thickness direction.

  In the manufacturing method of the present invention, the positive electrode lead is bonded to the positive electrode substrate in the bonding step, and then the positive electrode active material is filled in the gap portion of the positive electrode substrate. Then, in the pressing step, the positive electrode substrate is press-molded in the thickness direction. To do. As described above, since the degree of ductility differs between the positive electrode substrate including the resin skeleton and the positive electrode lead made of a metal plate, due to the difference in the degree of stretching between the positive electrode substrate and the positive electrode lead during press molding, There is a possibility that stress is generated at the boundary between the positive electrode substrate and the positive electrode lead and a crack is generated at the boundary between the bonded portions.

  On the other hand, in the manufacturing method of the present invention, as described above, a positive electrode substrate in which resin fibers constituting the resin skeleton are oriented in a predetermined direction is used as the positive electrode substrate. It joins to the crossing periphery part including the crossing periphery which cross | intersects the orientation direction of a resin fiber among the periphery of a board | substrate. As a result, when viewed in the direction along the surface of the positive electrode substrate (current collection direction), the boundary of the joint between the positive electrode substrate and the positive electrode lead is orthogonal or oblique to the orientation direction of the resin fibers.

Therefore, as described above, since the stretching of the positive electrode substrate can be suppressed at the boundary between the positive electrode substrate and the positive electrode lead at the time of press molding, the difference in the degree of stretching between the positive electrode substrate and the positive electrode lead can be reduced. Thereby, since the stress which arises in the boundary of the junction part of a positive electrode board | substrate and a positive electrode lead can be suppressed, and it can suppress that a crack arises in the boundary of a junction part, increase of the current collection resistance by press molding can be suppressed.
As described above, according to the production method of the present invention, it is possible to obtain a positive electrode for a battery with good current collection performance, even though the positive electrode for a battery is produced by press molding.

  Another solution includes a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, and a rectangular shape having a cavity in which a plurality of holes are three-dimensionally connected. A method for producing a positive electrode for a battery, comprising: a sheet-like positive electrode substrate; a positive electrode active material filled in the gap portion of the positive electrode substrate; and a positive electrode lead formed of a metal and bonded to the positive electrode substrate, As the positive electrode substrate, an electric resistance between two points that are equidistant in the positive electrode substrate, an electric resistance R1 applied in a direction orthogonal to the first side of the positive electrode substrate, and an electric resistance applied in a direction along the first side. For a battery including a bonding step of bonding a positive electrode lead to a first end portion including the first side of the positive electrode substrate, using a positive electrode substrate satisfying a relationship of R1 / R2 <1.0 with a resistor R2. Method for producing positive electrode A.

  In the manufacturing method of the present invention, in the joining step, as the positive electrode substrate, the electric resistance R1 applied in the direction orthogonal to the first side of the positive electrode substrate and the electric resistance R2 applied in the direction along the first side are R1 / R2 < A positive electrode substrate satisfying the relationship of 1.0 is used. That is, a positive electrode substrate having a smaller electric resistance in a direction orthogonal to the first side than in a direction parallel to the first side is used. Then, the positive electrode lead is bonded to the first end portion including the first side of the positive electrode substrate. As a result, the current collecting direction for collecting the charges in the positive electrode substrate to the positive electrode lead can be matched with the direction in which the electric resistance is small (the direction orthogonal to the first side) in the positive electrode substrate. Therefore, according to the production method of the present invention, it is possible to obtain a positive electrode for a battery having a small current collecting resistance and a good current collecting property.

Furthermore, in the method for manufacturing a positive electrode for a battery, in the joining step, a positive electrode substrate satisfying a relationship of R1 / R2 ≦ 0.5 between the electric resistance R1 and the electric resistance R2 is used as the positive electrode substrate. A method for producing a positive electrode for a battery is preferred.
In the positive electrode substrate satisfying the relationship of R1 / R2 ≦ 0.5, the electric resistance is particularly reduced in the direction (current collection direction) orthogonal to the first side. Therefore, by manufacturing a positive electrode for a battery using this positive electrode substrate, it is possible to obtain a positive electrode for a battery that has a particularly low current collecting resistance and excellent current collecting ability.

  Furthermore, in the method for manufacturing a positive electrode for a battery as described above, a positive electrode substrate satisfying a relationship of R1 / R2 ≧ 0.1 between the electric resistance R1 and the electric resistance R2 is used as the positive electrode substrate in the joining step. A filling step of filling a positive electrode active material in the gap of the positive electrode substrate after the bonding step, and a pressing step of press-molding the positive electrode substrate filled with the positive electrode active material in a thickness direction thereof; It is good to set it as the manufacturing method of the positive electrode for batteries provided with.

  In the manufacturing method of the present invention, a positive electrode substrate in which the electrical resistance R1 and the electrical resistance R2 satisfy the relationship of 0.1 ≦ R1 / R2 <1.0 is used in the joining step. In the positive electrode substrate satisfying the relationship of R1 / R2 <1.0, the boundary between the positive electrode substrate and the positive electrode lead in the direction along the surface of the positive electrode substrate (current collection direction) is in the resin fiber orientation direction. It is orthogonal or oblique. For this reason, in the subsequent pressing step, the stretching of the positive electrode substrate is suppressed at the boundary of the joint at the time of press molding, so that the difference in the degree of stretching between the positive electrode substrate and the positive electrode lead is reduced. Thereby, since the stress which arises in the boundary of the junction part of a positive electrode board | substrate and a positive electrode lead can be suppressed, and it can suppress that a crack arises in the boundary of a junction part, increase of the current collection resistance by press molding can be suppressed.

Incidentally, the smaller the value of R1 / R2 of the positive electrode substrate, the better the current collecting property of the positive electrode. However, when the value of R1 / R2 is too small, that is, the strength of the orientation of the resin fibers (direction perpendicular to the first side) If the degree of orientation of the positive electrode substrate is too strong, the electrical resistance of the positive electrode substrate itself is greatly increased by press molding. On the other hand, in the manufacturing method of this invention, the positive electrode board | substrate satisfy | filling the relationship of R1 / R2> = 0.1 is used. That is, a positive electrode substrate in which the strength of resin fiber orientation is suppressed is used. Thereby, the raise of the electrical resistance of positive electrode board | substrate itself by press molding can be suppressed.
As described above, according to the production method of the present invention, it is possible to obtain a positive electrode for a battery having good current collecting performance, even though the positive electrode for a battery is produced by press molding.

  Furthermore, in any one of the above-described methods for producing a positive electrode for a battery, the positive electrode substrate may be a method for producing a positive electrode for a battery using a positive electrode substrate in which the resin skeleton is a nonwoven fabric.

  When manufacturing a nonwoven fabric, the orientation of the resin fibers can be easily adjusted. Therefore, by using a positive electrode substrate whose resin skeleton is a non-woven fabric, a positive electrode for a battery having good current collecting property can be manufactured at low cost.

(Embodiment)
FIG. 1 is a front view of a battery 100 according to the present embodiment, FIG. 2 is a side view thereof, and FIG. 3 is a cross-sectional view thereof (corresponding to a cross-sectional view taken along line AA in FIG. 2).
The battery 100 according to this embodiment includes a battery case 110 made of metal (specifically, a nickel-plated steel plate), a safety valve 113, an electrode plate group 120 (see FIG. 3) disposed in the battery case 110, and A rectangular sealed nickel-metal hydride storage battery including an electrolytic solution (not shown). Among these, as the separator 125, the nonwoven fabric which consists of a synthetic fiber by which the hydrophilic treatment was carried out can be used, for example. As the electrolytic solution, for example, an alkaline aqueous solution having a specific gravity of 1.2 to 1.4 containing KOH as a main component can be used.

As shown in FIG. 3, the electrode plate group 120 is configured by alternately laminating a plurality of positive electrodes 121 and a plurality of negative electrodes 123 via separators 125.
Among these, the positive electrode 121 includes a positive electrode substrate 121k having a rectangular sheet shape and a positive electrode lead 121r bonded to the positive electrode substrate 121k, as shown in FIG. As shown in an enlarged cross-sectional view in FIG. 6, the positive electrode substrate 121k includes a resin skeleton 121f (specifically, non-woven fabric) made of resin fibers 121b and a metal coating layer 121c (specifically, nickel plating) covering the resin skeleton 121f. ), And a nickel-coated resin substrate having a gap portion K in which a plurality of holes are three-dimensionally connected. The positive electrode substrate 121k has a positive electrode filling portion 121s filled with the positive electrode active material 121d in the gap K and a first end portion 121t not filled with the positive electrode active material 121d. The positive electrode lead 121r is made of nickel having a rectangular plate shape, and is welded to the first end 121t including the first side 121m of the positive electrode substrate 121k.

Each of the positive electrodes 121 is arranged such that the positive electrode lead 121r extends in a predetermined direction (right side in FIG. 3). In the positive electrode substrate 121k of the present embodiment, the resin fibers 121b constituting the resin skeleton 121f are oriented in the orientation direction Y (vertical direction in FIG. 4) perpendicular to the first side 121m. The positive electrode substrate 121k includes a metal coating layer 121c (nickel plating) in a range of 100 g / m ^{2 to} 250 g / m ² (specifically, 200 g / m ² ). Thereby, the lifetime characteristic of a battery can be made favorable, suppressing the cost of nickel plating. Further, an active material containing nickel hydroxide is used as the positive electrode active material 121d.

  The negative electrode 123 includes a negative electrode filling portion 123s in which a hydrogen storage alloy or the like is filled in the negative electrode substrate 123k, a negative electrode unfilled portion 123t in which the hydrogen storage alloy or the like is not filled in the negative electrode substrate 123k, and a negative electrode unfilled portion And a negative electrode lead 123r welded to 123t. Each of the negative electrodes 123 is disposed so as to extend in a direction opposite to the positive electrode lead 121r (left side in FIG. 3).

  As shown in FIG. 3, the battery case 110 is made of a metal (specifically, a nickel-plated steel plate), a battery case 111 having a rectangular box shape, and a metal (specifically, a nickel-plated steel plate). And a rectangular plate-shaped sealing member 115. Among these, two through holes 111h are formed in the side wall portion 111e (the wall portion located on the right side in FIG. 3) of the battery case 111. A first positive terminal 140b and a second positive terminal 140c are inserted into the two through holes 111h with an electrically insulating seal member 145 interposed therebetween. Further, the sealing member 115 is welded all around in a state of being in contact with the opening end surface 111f (see FIG. 3) of the battery case 111, and seals the opening 111g of the battery case 111. Thereby, the sealing member 115 and the battery case 111 are integrated to form the battery case 110.

  Further, as shown in FIG. 3, each of the positive electrode leads 121r of the positive electrode 121 is brazed to the inner side surface 130b of the positive electrode current collecting member 130 having a rectangular plate shape by electron beam welding or the like. Furthermore, the positive electrode current collecting member 130 is joined to the first positive electrode terminal 140b and the second positive electrode terminal 140c by laser welding or the like. Thereby, the 1st positive electrode terminal 140b and the 2nd positive electrode terminal 140c, and the positive electrode 121 are electrically connected. Further, the negative electrode lead 123r of the negative electrode 123 is joined to the inner side surface 115b of the sealing member 115 having a rectangular plate shape by electron beam welding or the like. Thereby, in the battery 100 of this embodiment, the battery case 110 whole including the sealing member 115 becomes a negative electrode.

Next, a method for manufacturing the battery 100 of the present embodiment will be described below.
First, as shown in FIG. 7, a positive electrode substrate 121k having a rectangular sheet shape was prepared. As shown in the enlarged sectional view of FIG. 8, the positive electrode substrate 121k includes a resin skeleton 121f (specifically, non-woven fabric) made of resin fibers 121b and a metal coating layer 121c (specifically, nickel) covering the resin skeleton 121f. A nickel-coated resin substrate having a gap K in which a plurality of holes are three-dimensionally connected.

Further, in the positive electrode substrate 121k, the resin fibers 121b constituting the resin skeleton 121f are oriented in the orientation direction Y (vertical direction in FIG. 7) perpendicular to the first side 121m.
In addition, the orientation direction of the resin fiber 121b concerning the positive electrode substrate 121k can be measured by a well-known method. For example, an X-ray CT image and a transmission electron microscope CT image are acquired for the positive electrode substrate 121k, and fiber 3D measurement software, TRI / 3D-VOL-FBR (manufactured by Ratok System Engineering) is used based on these images. The orientation direction of the resin fiber 121b can be measured.

  Here, regarding the positive electrode substrate 121k, as shown in FIG. 7, it is the electric resistance between two points that are equidistant in the positive electrode substrate 121k, and the electric current between I and J in the direction orthogonal to the first side 121m. The resistance R1 and the electrical resistance R2 between LM in the direction parallel to the first side 121m were measured. Specifically, the voltage between I and J when a current of 1 A was passed between I and J was measured, and based on this, the electric resistance R1 was calculated. Similarly, the electrical resistance R2 between LM was measured. When the ratio between the electric resistances R1 and R2 was calculated, the relationship of 0.1 ≦ R1 / R2 <1.0 was satisfied.

  Next, in the bonding step, a positive electrode lead 121r made of nickel in a rectangular plate shape was bonded to the first end 121t including the first side 121m of the positive electrode substrate 121k. In addition, since the 1st end part 121t is previously rolled in the thickness direction (direction orthogonal to a paper surface in FIG. 4), the space | gap part has lose | disappeared.

  Next, proceeding to a filling step, the positive electrode active material 121d (such as nickel hydroxide) was filled in the gap of the positive electrode substrate 121k. At this time, the first end portion 121t joined to the positive electrode lead 121r is not filled with the positive electrode active material 121d because the void portion is eliminated by rolling as described above. Next, proceeding to a pressing step, each of the positive electrode substrates 121k filled with the positive electrode active material 121d was press-molded in the thickness direction (a direction perpendicular to the paper surface in FIG. 4). Thereby, the positive electrode 121 shown in FIGS. 4 and 5 was obtained.

  Next, the positive electrode 121 and the negative electrode 123 are alternately laminated while the separator 125 is interposed between the positive electrode 121 and the negative electrode 123 manufactured as described above, thereby forming the electrode plate group 120. Next, the positive electrode lead 121r and the positive electrode current collector 130 were joined by electron beam welding. Thereafter, the negative electrode lead 123r of the negative electrode 123 in the electrode plate group 120 is joined to the inner surface 115b side of the sealing member 115 by electron beam welding. Separately, the first positive terminal 140 b and the second positive terminal 140 c are fixed to the battery case 111. Specifically, the seal member 145 is attached to the through hole 111h of the battery case 111, and the pole column portions 141 of the first positive terminal 140b and the second positive terminal 140c are inserted from the outside. Next, fluid pressure is applied to the inside of the pole column portion 141 to bulge one end side of the pole column portion 141 radially outward and further compressively deform in the axial direction to form a compression deformed portion 141h. Accordingly, the first positive terminal 140b and the second positive terminal 140c are fixed to the battery case 111 while being electrically insulated from the battery case 111.

  Next, among the joined body formed by joining the electrode plate group 120, the sealing member 115, and the positive electrode current collecting member 130, the positive electrode current collecting member 130 and the electrode plate group 120 are inserted into the battery case 111 from the opening 111g. At the same time, the battery case 111 is covered with the sealing member 115. Next, laser is irradiated from the outside, the sealing member 115 and the battery case 111 are joined, and the battery case 111 is sealed. Next, the laser is irradiated from the outside of the first positive electrode terminal 140b and the second positive electrode terminal 140c toward the depression of the pole column portion 141, and the compression deformation portion 141h of the pole column portion 141 and the positive electrode current collecting member 130 are joined. . Next, an electrolyte is injected from an inlet 111k located in the ceiling 111a of the battery case 111, and a safety valve 113 is attached so as to close the inlet 111k. Then, the battery 100 of this embodiment is completed through a predetermined process.

(Examples and comparative examples)
Next, the current collection property of the positive electrode 121 of the present embodiment (Examples 1 to 4) was investigated.
Specifically, six kinds of positive electrode samples 21 to 26 (Examples 1 to 4 and Comparative Examples 1 and 2) having different orientations of resin fibers constituting the positive electrode substrate were manufactured, and their current collecting properties were compared.

Example 1
In Example 1, first, as shown in FIG. 9, a nickel-coated resin substrate 21k having a rectangular sheet shape of 20 mm long × 20 mm wide was prepared. In the nickel-coated resin substrate 21k of Example 1, the resin fibers constituting the resin skeleton are oriented in the orientation direction Y (vertical direction in FIG. 9) perpendicular to the first side 21m.

  Next, for this nickel-coated resin substrate 21k, as shown in FIG. 9, the electrical resistance R1 between two points of the central part C of the first side 21m and the central part D of the second side 21n was measured. Specifically, the voltage between CD when a current of 1 A was passed between CD was measured, and based on this, the electric resistance R1 was calculated. Similarly, the electrical resistance R2 between the two points of the central part E of the third side 21p and the central part F of the fourth side 21q was measured. When the ratio between the electric resistances R1 and R2 was calculated, R1 / R2 = 0.1.

(Examples 2 to 4)
In Examples 2 to 4, as shown in FIG. 9, nickel-coated resin substrates 22k to 24k having a rectangular sheet shape of 20 mm long × 20 mm wide were prepared. In the nickel-coated resin substrates 22k to 24k of Examples 2 to 4, as in Example 1, the resin fibers constituting the resin skeleton are oriented in the direction Y (vertical direction in FIG. 9) perpendicular to the first side 21m. Oriented. With respect to these nickel-coated resin substrates 22k to 24k, when the electrical resistances R1 and R2 were measured in the same manner as in Example 1, they were R1 / R2 = 0.15, 0.5, and 0.8 in this order.

(Comparative Examples 1 and 2)
In Comparative Examples 1 and 2, as shown in FIG. 9, nickel-coated resin substrates 25k and 26k having a rectangular sheet shape of 20 mm long × 20 mm wide were prepared. Although not shown, in the nickel-coated resin substrates 25k and 26k of Comparative Examples 1 and 2, unlike Examples 1 to 4, the resin fibers constituting the resin skeleton are orthogonal to or obliquely crossed with the first side 21m. It is not oriented in the direction (up and down diagonal direction in FIG. 9).

  Specifically, in the nickel-coated resin substrate 25k of Comparative Example 1, the orientation of the resin fibers constituting the resin skeleton was extremely weak, and it was difficult to specify the orientation direction. On the other hand, in the nickel-coated resin substrate 26k of Comparative Example 2, the resin fibers constituting the resin skeleton were oriented in a direction parallel to the first side 21m (left and right direction in FIG. 9). With respect to these nickel-coated resin substrates 25k and 26k, when the electrical resistances R1 and R2 were measured in the same manner as in Example 1, they were R1 / R2 = 1.0 and 1.5 in this order.

Next, positive electrode samples 21 to 26 according to Examples 1 to 4 and Comparative Examples 1 and 2 were manufactured using the nickel-coated resin substrates 21k to 26k of Examples 1 to 4 and Comparative Examples 1 and 2.
First, in the joining step, the nickel-coated resin substrate 21k of Example 1 was joined to the first end 21t including the first side 21m in a rectangular plate shape of 3 mm long × 20 mm wide and made of nickel. In addition, since the first end portion 21t is previously rolled in the thickness direction (a direction orthogonal to the paper surface in FIG. 9), the void portion disappears.

  Next, proceeding to a filling step, a positive electrode active material (such as nickel hydroxide) was filled into the voids of the nickel-coated resin substrate 21k. At this time, the first end portion 21t joined to the positive electrode lead 21r is not filled with the positive electrode active material because the void portion is eliminated by rolling as described above. After that, as shown in FIG. 10, the electrical resistance R3 between two points of the central part G of the first side 21rm of the positive electrode lead 21r and the central part D of the second side 21n of the nickel-coated resin substrate 21k was measured. Specifically, the voltage between GD when a current of 1 A was passed between points GD was measured, and based on this, the pre-press resistance R3 was calculated.

  Subsequently, it progressed to the press process and the nickel covering resin board | substrates 21k-26k with which the positive electrode active material was filled were press-molded in the thickness direction, respectively. This obtained the positive electrode sample 21 concerning Example 1 shown in FIG. Then, as shown in FIG. 10, the voltage between GD when 1 A of current was sent between GD points was measured, and based on this, resistance R4 after a press was computed.

  Thereafter, positive electrode samples 22 to 26 according to Examples 2 to 4 and Comparative Examples 1 and 2 were produced in the same manner as in Example 1, and a pre-press resistance R3 and a post-press resistance R4 were obtained. Based on these results, the current collecting properties of the positive electrode samples 21 to 26 according to Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated. These results are shown in Table 1. In Table 1, the electrical resistance of the pre-press resistance R3 of Comparative Example 2 is represented as a reference (100), and the other pre-press resistance R3 and post-press resistance R4 are represented as relative values.

  First, for the positive electrode samples 21 to 26 according to Examples 1 to 4 and Comparative Examples 1 and 2, the pre-press resistance R3 is compared. As shown in Table 1, in Comparative Examples 1 and 2, the pre-press resistance R3 was 82 or more (specifically 82, 100), whereas in Examples 1 to 4, the pre-press resistance R3 was 73 or less (specifically, 26, 32, 41, 73). Further, when comparing the post-press resistance R4, in Comparative Examples 1 and 2, the post-press resistance R4 was 86 or more (specifically 86, 106), whereas in Examples 1 to 4, the post-press resistance R4 The resistance R4 was 72 or less (specifically, 27, 30, 40, 72). From these results, it can be said that the positive electrode samples 21 to 24 of Examples 1 to 4 have better current collecting performance than the positive electrode samples 25 and 26 of Comparative Examples 1 and 2.

  This is considered to be due to the difference in the relationship between the orientation of the resin fibers constituting the nickel-coated resin substrate (positive electrode substrate) and the bonding position with the positive electrode lead 21r. Specifically, in Examples 1 to 4, unlike Comparative Examples 1 and 2, as shown in FIG. 10, the resin fibers constituting the resin skeleton of the nickel-coated resin substrates 21k to 24k are orthogonal to the first side 21m. The orientation is in the orientation direction Y (vertical direction in FIG. 10). Further, the positive electrode lead 21r is joined to the first end 21t including the first side 21m. Thus, when the charges in the nickel-coated resin substrates 21k to 24k are collected on the positive electrode lead 21r, the current can be collected along the resin fiber orientation direction Y (vertical direction in FIG. 10). It is considered that (the resistance R3 before pressing and the resistance R4 after pressing) could be reduced.

  Examining in more detail, in Comparative Examples 1 and 2, even though the electrical resistance (pre-press resistance R3) was as large as 82 or more before pressing, the electrical resistance (post-press resistance R4) was further increased after pressing. It has risen to over 86. In contrast, in Examples 1 to 4, the electrical resistance before pressing (pre-pressing resistance R3) is as small as 73 or less, and even after pressing, the electrical resistance (resistance after pressing R4) can be as small as 72 or less. It was. This is considered due to the following reasons.

  In Comparative Examples 1 and 2, when viewed in the direction along the surface of the nickel-coated resin substrates 25k and 26k (positive electrode substrate) (the direction parallel to the paper surface in FIG. 10), the nickel-coated resin substrates 25k and 26k and the positive electrode lead 21r The boundary 21w of the joint portion 21v is not orthogonal or oblique to the orientation direction of the resin fiber. In particular, in Comparative Example 2, the boundary 21w of the joint portion 21v between the nickel-coated resin substrate 26k and the positive electrode lead 21r is parallel to the resin fiber orientation direction (left-right direction in FIG. 10). Since the nickel-coated resin substrates 25k and 26k have a resin skeleton made of resin fibers, they are greatly stretched particularly in the direction in which the resin fibers are oriented, when press molding is performed. Thereby, in the subsequent pressing step, the extension of the nickel-coated resin substrates 25k and 26k becomes large at the boundary of the joint portion 21v at the time of press molding, so the extent of the extension between the nickel-coated resin substrates 25k and 26k and the positive electrode lead 21r. The difference becomes larger. For this reason, a large stress is generated at the boundary 21w of the joint portion 21v between the nickel-coated resin substrates 25k and 26k and the positive electrode lead 21r, and many fine cracks are generated at the boundary 21w of the joint portion 21v. It is considered that the current collection resistance (post-press resistance R4) increased due to this.

  In contrast, in Examples 1 to 4, the nickel-coated resin substrates 21k to 24k and the positive electrode are seen in the direction along the surface of the nickel-coated resin substrates 21k to 24k (positive electrode substrate) (the direction parallel to the paper surface in FIG. 10). The boundary 21w of the joint portion 21v with the lead 21r is orthogonal to the resin fiber orientation direction Y (vertical direction in FIG. 10). For this reason, in the subsequent pressing step, since the stretching of the nickel-coated resin substrates 21k to 24k is suppressed at the boundary of the joint portion 21v during press molding, the stretching of the nickel-coated resin substrates 21k to 24k and the positive electrode lead 21r is prevented. The difference in degree is reduced. Thereby, since the stress which arises in the boundary 21w of the junction part 21v of the nickel covering resin substrate 21k-24k and the positive electrode lead 21r can be suppressed, and it can suppress that a crack arises in the boundary 21w of the junction part 21v, by press molding It is thought that the increase in the current collecting resistance (resistance R4 after pressing) could be suppressed.

  Moreover, it can be said from the results of Examples 1 to 4 and Comparative Examples 1 and 2 that the current collecting property of the positive electrode tends to be better as the R1 / R2 value of the nickel-coated resin substrate (positive electrode substrate) is smaller. Specifically, as can be seen from Table 1, when the value of R1 / R2 is smaller than 1.0, it can be said that the current collecting property of the positive electrode is improved. In particular, it can be said that by setting R1 / R2 ≦ 0.5, the current collecting resistance of the positive electrode can be extremely reduced, and excellent current collecting properties can be obtained.

  Further, the results of Examples 1 to 4 will be compared and examined. In Examples 2 to 4, the value of the post-press resistance R4 was smaller than the pre-press resistance R3. As described above, in addition to being able to suppress an increase in the electrical resistance of the joint 21v due to press molding, the nickel-coated resin substrates 22k to 24k and the positive electrode lead 21r are brought into close contact with each other by press molding. This is probably because the contact resistance could be reduced. More specifically, it is considered that the increase in the electrical resistance of the joint portion 21v by the press molding can be made smaller than the reduction amount of the contact resistance between the nickel-coated resin substrates 22k to 24k and the positive electrode lead 21r by the press molding. .

  On the other hand, in Example 1, the value of the post-press resistance R4 was larger than the pre-press resistance R3. This is because, unlike Examples 2 to 4, the increase in the electrical resistance of the joint 21v by press molding was larger than the reduction in contact resistance between the nickel-coated resin substrate 21k and the positive electrode lead 21r by press molding. Conceivable. This is considered due to the following reasons.

  As described above, the smaller the R1 / R2 value of the nickel-coated resin substrate (positive electrode substrate), the better the current collecting property of the positive electrode. However, if the value of R1 / R2 is too small, that is, if the strength of the orientation of the resin fibers (the degree of orientation in the direction perpendicular to the first side 21m) is too strong, the positive electrode substrate itself is obtained by performing press molding. The electrical resistance of the will greatly increase. This is because, in the positive electrode substrate having a too small value of R1 / R2, the strength is low with respect to the force applied in the direction parallel to the first side because there are extremely few resin fibers extending in the direction parallel to the first side. . Therefore, when press molding is performed, part of the resin fiber extending in the direction parallel to the first side is greatly stretched or torn, so that part of the metal coating layer (nickel plating) covering this part is torn. It is thought to do. For this reason, in Example 1 in which the value of R1 / R2 is reduced to 0.1, unlike in Examples 2 to 4, it is considered that the value of post-press resistance R4 is larger than the pre-press resistance R3. From this result, if the value of R1 / R2 is further made smaller than 0.1, the increase in electrical resistance of the positive electrode substrate itself due to press molding is further increased, and there is a possibility that good positive electrode current collecting properties cannot be obtained. There is. Therefore, it can be said that the value of R1 / R2 is preferably 0.1 or more.

  From the above, it can be said that by using a positive electrode substrate that satisfies the relationship of 0.1 ≦ R1 / R2 <1.0, the current collecting property of the positive electrode can be improved. In particular, it can be said that by using a positive electrode substrate that satisfies the relationship of 0.1 ≦ R1 / R2 ≦ 0.5, it is possible to obtain a positive electrode having excellent current collecting properties.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.

For example, in the embodiment, the positive electrode 121 is manufactured using a nickel-coated resin substrate obtained by applying nickel plating to a nonwoven fabric as the positive electrode substrate 121k. However, the present invention can be applied to any positive electrode that uses a positive electrode substrate in which a resin skeleton made of resin fibers is coated with a metal coating layer.
In the embodiment, the nickel hydride storage battery has been described as an example of the battery 100. However, the present invention is not limited to the nickel hydride storage battery, and any battery including a positive electrode substrate having a resin skeleton made of resin fibers may be used. This battery can also be applied.

1 is a front view of a battery 100 according to an embodiment. It is a side view of the battery 100 concerning embodiment. It is sectional drawing of the battery 100 concerning embodiment, and is equivalent to AA sectional drawing of FIG. It is a top view of the positive electrode 121 concerning embodiment. It is a side view of the positive electrode 121 concerning embodiment. It is an expanded sectional view of the positive electrode 121 concerning embodiment, and is equivalent to the BB expanded sectional view of FIG. It is a top view of the positive electrode substrate 121k according to the embodiment. It is an expanded sectional view of the positive electrode substrate 121k concerning embodiment, and is equivalent to the HH expanded sectional view of FIG. It is a top view of the nickel covering resin board | substrates 21k-26k concerning Examples 1-4 and Comparative Examples 1 and 2. FIG. It is a top view of the positive electrode samples 21-26 concerning Examples 1-4 and Comparative Examples 1,2.

Explanation of symbols

100 battery 121 positive electrode (positive electrode for battery)
121b Resin fiber 121c Metal coating layer 121d Positive electrode active material 121f Resin skeleton (nonwoven fabric)
121k positive electrode substrate 121m first side (crossing edge)
121r positive electrode lead 121t first end (crossing peripheral edge)
K gap portion R1 electric resistance R2 of the positive electrode substrate in a direction orthogonal to the first side electric resistance Y of the positive electrode substrate in a direction parallel to the first side Y orientation direction of the fiber resin

Claims (15)

A positive electrode substrate comprising a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, wherein a plurality of holes are connected in three dimensions;
A positive electrode lead made of a positive electrode active material filled in the gap of the positive electrode substrate and a metal, and joined to a peripheral portion including a part of the peripheral edge of the positive electrode substrate;
A battery positive electrode comprising:
The positive electrode substrate is formed by orienting the resin fibers constituting the resin skeleton in a predetermined direction,
The positive electrode for a battery, wherein the positive electrode lead is bonded to an intersecting peripheral edge portion including an intersecting peripheral edge that intersects an orientation direction of the resin fiber in the peripheral edge of the positive electrode substrate. The battery positive electrode according to claim 1,
The positive electrode substrate has a rectangular sheet shape and has a first side that is the intersecting peripheral edge,
The positive electrode for a battery, wherein the positive electrode lead is bonded to a first end portion including the first side, which is the intersecting peripheral edge portion of the positive electrode substrate. The battery positive electrode according to claim 1 or 2,
The positive electrode substrate is a positive electrode for a battery in which an orientation direction of the fiber resin is orthogonal to the intersecting peripheral edge or the first side. The battery positive electrode according to any one of claims 1 to 3,
A positive electrode for a battery, wherein the positive electrode lead is bonded to the positive electrode substrate and then press-formed in the thickness direction of the positive electrode substrate. A rectangular sheet-like positive electrode substrate comprising a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, and a plurality of holes connected in three dimensions.
A positive electrode lead made of a positive electrode active material filled in the gap of the positive electrode substrate, and a metal, and joined to a first end including the first side of the positive electrode substrate;
A battery positive electrode comprising:
The positive substrate is
An electrical resistance between two points that are equidistant in the positive electrode substrate, and an electrical resistance R1 applied in a direction orthogonal to the first side and an electrical resistance R2 applied in a direction parallel to the first side are R1. Battery positive electrode satisfying the relationship of /R2<1.0. The positive electrode for a battery according to claim 5,
In the positive electrode substrate, the electrical resistance R1 and the electrical resistance R2 satisfy a relationship of R1 / R2 ≧ 0.1,
A positive electrode for a battery, wherein the positive electrode lead is bonded to the positive electrode substrate and then press-formed in the thickness direction of the positive electrode substrate. The battery positive electrode according to any one of claims 1 to 6,
The positive electrode substrate is a battery positive electrode including the metal coating layer in a range of 100 g / m ^{2 to} 250 g / m ² . The battery positive electrode according to any one of claims 1 to 7,
The positive electrode for a battery, wherein the resin skeleton of the positive electrode substrate is a nonwoven fabric. A battery provided with the positive electrode for a battery according to any one of claims 1 to 8. A positive electrode substrate comprising a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, wherein a plurality of holes are connected in three dimensions;
A method for producing a positive electrode for a battery, comprising: a positive electrode active material filled in the gap of the positive electrode substrate; and a positive electrode lead made of a metal and bonded to a peripheral portion including a part of the peripheral edge of the positive electrode substrate. And
As the positive electrode substrate, using a positive electrode substrate in which the resin fibers constituting the resin skeleton are oriented in a predetermined direction,
A method for producing a positive electrode for a battery, comprising: a joining step of joining the positive electrode lead to an intersecting peripheral edge portion including an intersecting peripheral edge intersecting an orientation direction of the resin fiber among peripheral edges of the positive electrode substrate. It is a manufacturing method of the positive electrode for batteries according to claim 10,
In the joining step,
As the positive electrode substrate, a positive electrode substrate having a rectangular sheet shape and having a first side that is the intersecting peripheral edge,
A method for producing a positive electrode for a battery, wherein the positive electrode lead is joined to a first end portion including the first side, which is the intersecting peripheral edge portion of the positive electrode substrate. It is a manufacturing method of the positive electrode for batteries of Claim 10 or Claim 11,
After the joining step, a filling step of filling a positive electrode active material in the gap portion of the positive electrode substrate;
A method for producing a positive electrode for a battery, comprising: a pressing step of press-molding the positive electrode substrate filled with the positive electrode active material in a thickness direction thereof. A rectangular sheet-like positive electrode substrate comprising a resin skeleton made of resin fibers and having a three-dimensional network structure, and a metal coating layer made of metal and covering the resin skeleton, and a plurality of holes connected in three dimensions.
A positive electrode lead made of a positive electrode active material filled in the gap of the positive electrode substrate and a metal and bonded to the positive electrode substrate;
A method for producing a positive electrode for a battery having
As the positive electrode substrate, an electric resistance between two points that are equidistant in the positive electrode substrate, and an electric resistance R1 applied in a direction orthogonal to the first side of the positive electrode substrate, and applied in a direction along the first side. Using a positive electrode substrate in which the electrical resistance R2 satisfies the relationship of R1 / R2 <1.0,
The manufacturing method of the positive electrode for batteries provided with the joining process which joins the said positive electrode lead to the 1st edge part containing the said 1st edge | side among the said positive electrode substrates. It is a manufacturing method of the positive electrode for batteries according to claim 13,
In the joining step,
As the positive electrode substrate, a positive electrode substrate in which the electric resistance R1 and the electric resistance R2 satisfy a relationship of R1 / R2 ≧ 0.1 is used,
After the joining step, a filling step of filling a positive electrode active material in the gap of the positive electrode substrate;
A method for producing a positive electrode for a battery, comprising: a pressing step of press-molding the positive electrode substrate filled with the positive electrode active material in a thickness direction thereof. It is a manufacturing method of the positive electrode for batteries according to any one of claims 10 to 14,
The manufacturing method of the positive electrode for batteries using the positive electrode substrate whose said resin skeleton is a nonwoven fabric as said positive electrode substrate.

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