JP2000299100A - Electrode plate for storage battery, and storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrode plate for a storage battery and the storage battery which allows reducing an electric resistance of the electrode plate to obtain a high discharge characteristic by increasing a contact area between a substrate and a current collecting tab and enabling current collection over the full length of the substrate to have high current collecting efficiency. SOLUTION: When a rectangular conductive porous substrate 12 of this electrode plate 11 for a storage battery is filled and coated with a pasty material 13 containing an active material, an uncoated end edge part 14 is left along one longitudinal side thereof. After drying and rolling of the pasty material 13, an elongate belt-shaped long sideways current collecting tab 15 is continuously welded to the uncoated end edge part 14. When the electrode plate 11 for the storage battery having such a structure is cylindrically wound, the wound current collecting tab 15 projects from the cylindrical electrode plate 11. The cylindrical electrode plate 11 having the current collecting tab 15 projecting from its bottom face is installed into a battery can with a disk-like collector interposed between the current collecting tab 15 and the bottom wall of the battery can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrode plate for a storage battery and a storage battery using the electrode plate, and more particularly to an electrode plate for a nickel-metal hydride storage battery and a storage battery using the electrode plate.

[0002]

2. Description of the Related Art As shown in FIG. 8, a negative electrode plate 1 of a conventional nickel-metal hydride battery comprises a rectangular substrate 2 and a pasty material 3 containing an active material filled and rolled. Have been. The substrate 2 is a nickel-plated mild steel material and is a perforated plate such as a mesh or a punched metal.
Further, the paste-like substance 3 contains a hydrogen storage alloy, a conductive agent, a binder, and a dispersant.

A negative electrode plate 1 of a conventional nickel-metal hydride storage battery
The current collecting tab 5 is a strip-shaped conductive plate that is long in the vertical direction, and the paste-like substance 3 is formed on a part of the longitudinal edge of the substrate 2.
As shown in FIG. 9, one end of the current collecting tab 5 is welded to the substrate exposed portion 4 obtained by removing the current collector tab 5 so that the current collecting tab 5 takes a direction orthogonal to the longitudinal direction of the substrate 2. . The negative electrode plate 1 with the current collecting tab 5 formed in this manner is shown in FIG.
It is wound so as to form a cylindrical body 6 as shown in FIG. As a result, a structure is obtained in which the current collecting tab 5 protrudes from the bottom end surface of the cylindrical body 6. The projecting current collecting tabs 5 at the bottom of the structure are then bent along the bottom of the cylindrical body 6 as shown at 5a in FIG. Then, the negative electrode plate 1 having the structure shown in FIG. 11 is inserted into the bottomed cylindrical battery can 7 as shown in FIG. 12, and the bent current collecting tab 5 a is electrically connected to the bottom plate 8 of the battery can 7. Contacted in a state. Thereafter, a lid 9 incorporating a safety valve is provided on the open top of the battery can 7 to complete the battery, as is well known.

[0004]

The electrode plate for a storage battery according to the prior art described above has a configuration in which the narrow end of the current collecting tab 5 is in contact with a part of the conductive substrate 2 in the longitudinal direction. Therefore, the contact area between the substrate 2 and the current collecting tab 5 is small, and current collection is not performed in a portion where the current collecting tab 5 is not provided, so that current collecting efficiency is low. Was difficult to get. For this reason, the above-mentioned conventional electrode plate for a storage battery is not sufficient as an electrode plate for a round secondary battery requiring high output for an electric assist bicycle, an electric motorcycle, or a hybrid vehicle.

Therefore, according to the present invention, since the contact area between the substrate and the current collecting tab is large and current can be collected over the entire length of the substrate, the current collecting efficiency is high, and the electric resistance of the electrode plate can be reduced. It is an object of the present invention to provide a storage battery electrode plate capable of obtaining high discharge characteristics.

Another object of the present invention is to provide a storage battery using the above electrode plate.

[0007]

According to the present invention, the above object is achieved by filling a rectangular conductive porous substrate with a paste-like substance containing an active material, coating, drying and rolling, In an electrode plate for a storage battery which is inserted into a battery can by being wound in a cylindrical shape, an uncoated edge not covered with a paste-like material containing an active material is formed along a long side of the conductive porous substrate. The present invention is achieved by a configuration in which an elongated strip-shaped current collecting tab is continuously joined to the uncoated edge along the long side.

Further, according to the present invention, a cylindrical battery can,
A negative electrode plate for a storage battery, which is formed by filling a rectangular conductive porous substrate with a paste-like material containing an active material, coating, drying, and rolling, and being wound into a cylindrical shape in the battery can and inserted. Forming an uncoated edge, which is not coated with a paste-like substance containing an active material, along a long side of the conductive porous substrate on the battery can bottom wall side; An elongated band-shaped current collecting tab is continuously joined to the edge,
A storage battery is provided in which a disk-shaped collector is interposed in a conductive state between a current collection tab and a bottom wall of a battery can.

The disk-shaped collector has notches radially formed radially inward from the outer periphery thereof, and ribs are formed so as to rise along both radial edges of each notch. The rib may be configured to be in contact with the current collecting tab.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the negative electrode plate of the nickel-metal hydride storage battery is indicated by reference numeral 11 as a whole. The negative electrode plate 11 is composed of a rectangular substrate 12 and a paste-like material 13 containing an active material filled and rolled. The substrate 12 is made of, for example, a nickel-plated mild steel material and a perforated plate such as a mesh or a punched metal. As is well known, the paste-like substance 3 is obtained by kneading a powdery hydrogen storage alloy, a conductive agent, a binder, and a dispersant in the presence of water to adjust the viscosity and the temperature. The paste-like substance 3 is applied to the surface of the substrate 12 and then rolled to fill the hollow portion of the substrate 12 and be integrated with the substrate 12 in a state of covering the surface of the substrate 12 in a layered manner. As is well known, the hydrogen storage alloy contained in the paste-like substance 3 enables charging or discharging by storing or releasing oxygen and hydrogen generated when the battery is charged or discharged.

According to the present invention, as shown in FIG. 1, a rectangular negative electrode plate 11 has a substrate having no layer of paste-like substance 3 along the entire length of one longitudinal edge thereof. An exposed portion 14 is formed. In the substrate exposed portion 14, the porous surface of the conductive substrate 12 is exposed in a strip shape. This exposure width is, for example, 3 mm. The substrate exposed portion 14 can be formed by applying the paste-like substance 3 to the surface of the substrate 12 except for a portion corresponding to the substrate exposed portion 14, drying and rolling.

In the present invention, the current collecting tab 15 is formed of a strip-shaped conductive plate that is long in the lateral direction along the substrate exposed portion 14.
In the illustrated example, the current collecting tab 15 is formed to have the same length as the substrate exposed portion 14 over the entire length of the substrate, but in some cases, the substrate exposed portion 14 is formed over a length shorter than the entire length of the substrate 12. , The current collecting tab 15 is also exposed to the substrate
Can be formed in a length corresponding to the length of However, it is desirable that the substrate exposed portion 14 be provided over the entire length of the substrate 12. As shown in FIG. 2, the current collecting tab 15 is joined to the surface of the substrate exposed portion 14 along the longitudinal direction thereof by welding or the like.

The negative electrode plate 11 with the current collecting tab 15 thus formed is wound so as to form a cylindrical body 17 as shown in FIG. As a result, a structure is obtained in which the current collecting tab 15 protrudes from the bottom circular end face of the cylindrical body 17 in the form of a spiral rib. Next, this structure is inserted into the bottomed cylindrical battery can 7 shown in FIG. 5 together with the substantially disk-shaped conductive collector 18 shown in FIG.

As shown in FIG. 7, the disk-shaped collector 18 has a plurality of cutouts 19 formed radially in a radial direction from an outer peripheral edge of a conductive metal plate 20 basically having a disk shape. It has a configuration in which upright ribs 21 are formed along both side edges in the radial direction of the notch 19. This disk-shaped collector 18
First, as shown in FIG. 5, it is mounted on the bottom wall 7a of the cylindrical battery can 7 with a bottom, and then the cylindrical body 17 of the negative electrode plate 11 with the current collecting tab 15 is inserted thereon. This allows
As shown in FIG. 6, the lower surface of the disk-shaped collector 18 is in surface contact with the bottom wall 7a of the cylindrical battery can 7, and
The current collecting tabs 15 projecting from the bottom surface of the cylindrical body 17 are in contact with the ribs 21 on the upper surface in a crossed manner. Therefore, the negative electrode plate 11 can be electrically connected to the bottom wall 7 a of the battery can 7 via the current collecting tab 15 and the disk-shaped collector 18. The contact between the current collecting tab 15 and the rib 21 is ensured by the raised rib 21.

As described above, the disc-shaped collector 18 and the negative electrode plate 11 with the current collecting tab 15 are inserted into the battery can 7, and finally, as shown in FIG. The battery is obtained by attaching the lid 23 by caulking as is well known. In FIG. 5, reference numeral 24 denotes a safety valve;
Is a cap constituting an external terminal, 26 is a sealing plate, 2
7 is an opening of the sealing plate 26, 28 is a sealing body of the safety valve, 2
Reference numeral 9 denotes a safety valve spring, reference numeral 30 denotes an anode tab, and reference numeral 31 denotes an anode-side current collector. These are well-known members. 32 is a caulking part.

As described above, the substrate exposed portion 14 is provided at the longitudinal edge of the negative electrode plate 11 of the storage battery electrode plate, and the current collecting tabs 15 are joined along the longitudinal direction by welding or the like. The contact area between the substrate 12 and the current collecting tab 15 is larger than in the conventional case, and uniform current collection is possible at any position in the longitudinal direction of the substrate 12. Furthermore, in order to constitute a battery, the collector 18 is interposed between the storage battery electrode plate and the battery can bottom wall, so that the contact area with the battery can bottom wall increases, and the electrical resistance at that portion decreases. . This makes it possible to realize a round secondary battery requiring high output.

Although the above description has been limited to the case where the current collecting tab is joined to the negative electrode plate, the above-described configuration can be applied to the positive electrode plate.

[0019]

According to the electrode plate for a storage battery of the present invention, a substrate exposed portion is provided at an edge in the longitudinal direction of the electrode plate, and a current collecting tab is joined along the longitudinal direction, so that the substrate and the current collector are collected. The contact area of the tab is larger than in the conventional case, uniform current collection is possible at any position in the longitudinal direction of the substrate, the electric resistance of the electrode is reduced, and the output can be increased. In addition, in the storage battery of the present invention, in addition to the above-described effect of the electrode plate, the contact area between the electrode plate and the battery can bottom wall is provided by interposing the collector between the battery can bottom wall and the current collecting tab of the electrode plate. And the electric resistance of the portion can be reduced, and a high-output battery can be obtained. In addition, by forming the rising rib on the collector, the contact between the collector tab of the electrode plate and the collector is made more effective.

[Brief description of the drawings]

FIG. 1 is a developed view showing a state before assembling a storage battery electrode plate of the present invention.

FIG. 2 is a developed view showing a state during the assembly of the storage battery electrode plate of the present invention.

FIG. 3 is a perspective view showing a state in which the electrode plate for a storage battery of the present invention is being assembled following the state shown in FIG. 2;

FIG. 4 is a perspective view showing a state before mounting the electrode plate for a storage battery of the present invention in a battery can and a collector.

FIG. 5 is a longitudinal sectional view of a storage battery formed by incorporating the storage battery electrode plate of the present invention into a battery can.

FIG. 6 is a partially enlarged longitudinal sectional view of FIG. 5;

FIG. 7 is a perspective view showing a collector incorporated in the battery can.

FIG. 8 is a development view showing a state before assembling a conventional storage battery electrode plate.

FIG. 9 is a developed view showing a state in the middle of assembling a conventional storage battery electrode plate.

FIG. 10 is a perspective view showing a state in which the conventional storage battery electrode plate is being assembled following the state shown in FIG. 9;

FIG. 11 is a perspective view showing a state before mounting a conventional storage battery electrode plate in a battery can.

FIG. 12 is a partially omitted longitudinal sectional view of a storage battery formed by incorporating a conventional storage battery electrode plate into a battery can.

[Explanation of symbols]

 Reference Signs List 7 cylindrical battery can 7a battery can bottom wall 11 electrode plate 12 conductive porous substrate 13 paste-like substance 14 uncoated edge 15 current collecting tab 18 disk-shaped collector 19 notch 21 rib

Claims (3)

[Claims] 1. A storage battery which is formed by filling a rectangular conductive porous substrate with a paste-like substance containing an active material, coating, drying and rolling, and then winding and inserting into a battery can in a cylindrical shape. In the electrode plate, an uncoated edge not coated with a paste-like material containing an active material is formed along a long side of the conductive porous substrate, and the uncoated edge is formed on the uncoated edge. An electrode plate for a storage battery, characterized in that an elongated strip-shaped current collecting tab along the line is continuously joined. 2. A cylindrical battery can and a rectangular conductive porous substrate are filled with a paste-like material containing an active material, coated, dried and rolled, and formed into a cylindrical shape in the battery can. In a storage battery having a storage battery negative electrode plate wound and inserted, a paste-like substance containing an active material is formed along a long side of the conductive porous substrate wound in a cylindrical shape on a battery can bottom wall side. An uncoated edge that is not covered is formed, and an elongated strip-shaped current collecting tab is continuously joined to the uncoated edge, and a disc-shaped current collecting tab and a bottom wall of the battery can are formed. A storage battery comprising a collector interposed in a conductive state. 3. The disk-shaped collector has notches formed radially radially inward from the outer periphery thereof, and ribs are formed so as to rise along both radial edges of each notch.
The storage battery according to claim 2, wherein the ribs are in contact with the current collecting tab.