JPH09161840A - Alkaline storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve electric connection and simplify electrode plate working, by providing a base plate exposure part on the end part of a positive electrode plate, positioned in the outermost periphery of an electrode plate group, wherein specific positive and negative electrode plates are spirally wound with a separator. SOLUTION: A spongelike metallic base plate is filled with active material to obtain a beltlike positive electrode plate 1. The positive and negative electrode plates 1 and 3 are spirally wound with a separator 9, so that the base plate exposure part 1a of the positive electrode plate 1 can be positioned on the outermost periphery, to obtain the electrode plate group. The electrode plate group is housed in a battery case 6 to contact the exposure base plate 1a and the inner surface of the case 6. While in the negative electrode plate 3, one end of a lead piece 8 is welded to the current collecting solid color part of an end edge along the longitudinal direction of the negative electrode plate 3 to spot-weld the other end of the lead pieces 8 to the lower surface of a sealing plate 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkaline storage battery, in particular, a positive electrode plate of which a sponge-like metal substrate (hereinafter referred to as foam metal) is used and filled with an active material, and the end portion of the electrode plate group The present invention relates to an improvement in an electrical connection structure between a battery case and a battery case when it is spirally wound so as to be located at the outermost periphery.

[0002]

2. Description of the Related Art In a battery provided with an electrode plate group in which a strip-shaped positive electrode plate and a negative electrode plate are wound in a spiral shape with a separator interposed therebetween, the lead terminal of the normal electrode plate is usually a 3A
As shown in FIG. 3, in the current collecting plain portion 2 provided at the upper end edge in the longitudinal direction, in the case of the negative electrode plate 3, as shown in FIG. 3B, in the plain current collecting portion 4 provided at the lower end edge in the longitudinal direction, Each ribbon-shaped lead piece is formed by welding. In general, as shown in FIG. 4, the lead piece 5 of the positive electrode plate 1 has a sealing plate 7 located on the open end side of the battery case 6 which also serves as an external terminal.
The lead pieces 8 of the negative electrode plate 3 are designed so as to be positioned toward the bottom surface of the case 6, which is the opposite direction. In the figure, 9 is a separator, 10 is a positive electrode terminal provided in the center of the upper surface of the sealing plate 7, and a rubber safety valve 11 is provided inside the cap. Reference numeral 12 is an insulating gasket installed between the battery case and the sealing plate, and 13 is an insulating plate arranged above and below the spiral electrode group.

Further, in a battery having a spiral electrode plate group and the outermost periphery of this electrode plate group being constituted by a negative electrode plate, electricity is generated simply by bringing the current collector at the terminal end thereof into contact with the inner peripheral surface of the case. In some cases, a positive connection is secured and the case is used as a negative electrode terminal.

On the other hand, in an electrode plate using foamed metal for the electrode substrate, it is not possible to easily provide a plain portion for collecting current at the longitudinal edge of the electrode plate. In order to form a portion, the active material is scraped off, pressure is applied before or after exposing the nickel substrate, and a lead piece is spot-welded to this portion to form a lead terminal.

[0005]

In the structure of the lead terminal as described above, the positive electrode plate and the negative electrode plate are provided with the plain portions for collecting current at the upper and lower edges of the positive and negative electrodes in the longitudinal direction. Almost no problem occurs from the power line.

However, in an electrode plate using a foam metal as a substrate, a part of the active material is scraped off in order to provide a lead terminal, and the nickel metal which is the substrate is exposed at that part.
It is necessary to perform spot welding of the lead pieces here.

The work of spot welding the lead pieces is
A lot of man-hours are required because pressure treatment of the substrate is required before or after the scraping of the active material, and the spot welding strength of the lead pieces also varies, increasing the electrical resistance of the lead piece attachment part, In an extreme case, the lead piece may come off due to vibration, resulting in many variations in battery performance.

The main object of the present invention is to solve such a problem.

[0009]

According to the present invention, the positive electrode plate formed by using foam metal as the substrate exposes the substrate at the outermost end of the spiral electrode plate group, and this portion is used as a battery case. By making them contact, the electrical connection between them is maintained.

With this structure, since the positive electrode plate itself using the foam metal as the substrate is provided with the lead terminal at one end, spot welding of the lead piece can be eliminated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the invention according to claim 1 of the present invention, the substrate is exposed at one end of the positive electrode plate located at the outermost periphery of the spiral electrode plate group, and this portion is brought into contact with the battery case. The electrical connection between the two can be easily achieved without requiring spot welding work for the lead terminals.

Along with this, the degree of freedom of the lead terminal lead-out structure of the negative electrode plate is also increased. For example, a plain portion for current collection is provided at the upper edge of the negative electrode plate, and a lead piece or a lead piece is integrally provided here. When the plate-shaped current collector is welded and the sealing plate and the tip of the lead piece are welded, the orientation of the lead piece is not restricted.

[0013]

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

FIG. 1A shows a strip-shaped positive electrode plate 1 in which a foam metal is used as a substrate. Most of the substrate is filled with an active material, and an end located at the outermost periphery of the spiral electrode plate group. The substrate 1a is exposed only in a portion to serve as a lead terminal. FIG.
B represents the shape of the negative electrode plate 3, and a plain current collecting portion 4 made of an exposed core material is provided along the longitudinal direction at the upper end edge thereof.

When the positive and negative electrode plates 1 and 3 and the separator 9 are used to form a spiral electrode plate group, the electrode plate group is formed by spirally winding the exposed substrate 1a so that the exposed substrate 1a is located at the outermost periphery thereof. did. The electrode plate group was housed in the battery case 6 to assemble the cylindrical alkaline storage battery shown in FIG. Since the exposed substrate 1a of the positive electrode plate 1 is located on the outermost periphery of the spiral electrode plate group, this portion is brought into contact with the inner peripheral surface of the case 6 to maintain the electrical connection between the two. 6 also functions as a positive electrode terminal. The negative electrode plate 3 is obtained by welding one end of the lead piece 8 to the plain current collecting portion 4 along the longitudinal edge thereof and spot welding the other end to the lower surface of the sealing plate 7. Therefore, the sealing plate 7 is negatively charged and the cap-type terminal 10
Is the negative terminal. In this configuration, the terminal polarity is reversed from that of the conventional battery shown in FIG. However, the battery can be used in the same manner as before, as long as the polarities of the terminals are not mistaken during use.

Further, in this configuration, the positive electrode side electrical connection does not require a lead piece, and the contact between the positive electrode plate and the case can be maintained over a wider area than in the case where the lead piece is used, and the electrical resistance of the connection portion can be maintained. Can be lowered. Moreover, for electrical connection,
Spot welding is unnecessary and the work man-hour can be reduced.
Furthermore, the negative electrode lead piece is only positioned upward on the upper side of the spiral electrode plate group, and spot welding between this and the sealing plate can be easily performed without restriction.

The exposed portion of the substrate at the end of the positive electrode plate can be easily formed by scraping off the active material on the substrate surface with a metal buff or a synthetic resin buff in the electrode plate manufacturing process. Good contact can be maintained. Since the foam metal that is the substrate is generally made of pure nickel, the nickel metal surface of the substrate is placed on the outermost periphery of the spiral electrode plate group simply by scraping off the active material on the end surface of the electrode plate with a buff or the like. This is because it can be exposed easily.

Further, in order to improve the contact and electrical connection between the positive electrode plate and the battery case, the foam metal at one end of the positive electrode plate should be protected in advance with a mask so that the active material is not filled in this part. It is also effective to secure the exposed portion of the substrate.

[0019]

As described above, according to the present invention, when connecting the spiral electrode plate group and the battery terminal, the substrate exposed portion made of foam metal is provided at the end of the positive electrode plate located at the outermost periphery of the electrode plate group. Since this part is in contact with the inner peripheral surface of the battery case, the electrical connection between the two can be maintained well, and the work of spot welding the lead piece to the positive electrode plate can be eliminated, and the electrode plate processing It can be simplified. Moreover, the battery can be easily assembled and the electrical connection between the positive electrode plate and the battery case is good, so that variations in battery performance can be reduced.

[Brief description of the drawings]

FIG. 1A is a diagram showing a positive electrode plate of the present invention, and FIG. 1B is a diagram showing the same negative electrode plate.

FIG. 2 is a perspective view showing the battery of the present invention in a cutaway manner.

FIG. 3A is a diagram showing a conventional positive electrode plate, and FIG. 3B is a diagram showing the same negative electrode plate.

FIG. 4 is a perspective view showing a conventional battery in a cutaway manner.

[Explanation of symbols]

 1 Positive Plate 1a Substrate Exposed Part 3 Negative Plate 4 Plain Part for Current Collection 6 Battery Case 7 Sealing Plate 8 Negative Lead Piece

Claims (3)

[Claims] 1. An alkaline storage battery in which a positive electrode plate and a negative electrode plate are spirally wound with a separator interposed between them, and an electrode plate group is housed in a battery case. The positive electrode plate has a sponge-like metal substrate and an active material. It is filled, and its end located at the outermost periphery of the electrode plate group consists of the exposed part of the substrate, and this part contacts the inner peripheral surface of the battery case and maintains the electrical connection with the case. Storage battery. 2. An alkaline storage battery in which a positive electrode plate and a negative electrode plate, which are spirally wound with a separator interposed therebetween, are housed in a battery case, and the positive electrode plate comprises a sponge-like metal substrate and an active material. The negative electrode plate is provided with a plain portion for current collection and a lead terminal connected to it at the upper edge of the negative electrode plate. The portion is in contact with the inner peripheral surface of the battery case, and the lead terminal connected to the negative electrode plate is connected to a sealing plate that seals the open end of the battery case via an insulating gasket. 3. The alkaline storage battery according to claim 2, wherein an end portion of the positive electrode plate, which is an exposed portion of the substrate, is not filled with an active material.