JPH0679066U - Paste type electrode - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a paste-type electrode having a structure in which a collector terminal can be easily attached. [Composition] A paste-type electrode using as a substrate a core body having a structure in which pyramidal projections of rectangular through holes are alternately arranged in opposite directions,
The above object can be achieved by using a paste-type electrode in which the substrate core is exposed at the end of the electrode to form a smooth surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paste-type electrode used for alkaline storage batteries and the like.

[0002]

[Prior art]

 As a substrate for conventional paste-type electrodes, a porous metal fiber body having a high porosity of 90% or more or a porous metal foam body is mainly used, and various pastes can be prepared by filling the substrate with a slurry-like active material. A formula electrode is created.

As a conventional method of providing a current collecting terminal to these electrodes, a method of preliminarily attaching a current collecting terminal to a substrate before filling the active material, and collecting the active material after removing the active material from the substrate Although there is a method of attaching terminals afterwards, in both cases, the strength of the substrate itself is very weak and it is very difficult to attach the current collecting terminal because a porous metal substrate with high porosity of 90% or more is used. , The installation process becomes complicated. For example, the method of (1) requires a complicated operation of removing the active material in the porous body by running water or ultrasonic waves, and at that time, problems such as damage and breakage of the substrate are likely to occur, and the active material is completely removed. If not, there is a problem such as welding failure due to the occurrence of sparks during welding of the current collector terminal.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems, and provides a paste-type electrode having a structure in which a collector terminal can be easily attached.

[0005]

[Means for Solving the Problems]

 In the electrode of the present invention, a core having a structure in which square through holes having pyramidal protrusions are alternately arranged in opposite directions is used as a substrate, and the core of the substrate is exposed at the end of the electrode to form a flat surface, and a smooth surface thereof is formed. It is characterized in that a current collecting terminal is provided by welding a lead terminal or a strip-shaped metal plate to the. Further, the present invention is characterized in that an exposed portion or a smooth surface of the substrate core of the electrode is bent to be doubled, and the bent portion is seam welded to provide a collector terminal.

[0006]

[Work]

 The substrate used in the present invention is one in which a square through hole having pyramidal protrusions is formed in the upside-down direction by passing a metal sheet (substrate core) between two rolls having pyramid-shaped protrusions cut on the surface. Therefore, the substrate strength is high, and the active material can be mechanically completely removed by a metal brush or the like, and the metal surface can be easily exposed. Then, by pressurizing the exposed portion, the protrusion is smoothed to be a plate-shaped metal surface, and the welding of the lead terminal for current collection becomes possible. Further, in the case where the substrate core is a thin plate having a thickness of 50 μm or less, conventionally, a band-shaped metal plate is newly seam-welded as a reinforcing material. By double folding and seam welding the bent portions, a strong smooth plate-shaped metal surface can be formed, and welding of a reinforcing material or the like can be conventionally required.

[0007]

【Example】

 An embodiment of the present invention will be described below. First, a nickel sheet having a thickness of 50 μm is passed between rolls provided with pyramidal protrusions, and pyramidal needle-shaped protrusions are alternately penetrated in opposite directions to open holes at the same time to form protrusions. An electrode substrate (A) was produced. The opening diameter was about 500 μm and the thickness was about 400 μm. In addition, 1 is a through hole. To this electrode substrate (A), a slurry of active material 2 prepared by mixing a hydrogen storage alloy powder with a conductive agent and a binder was applied, dried and pressed to produce a hydrogen storage alloy electrode (AA) (Fig. 2). In addition, 3 is a protrusion.

As a comparative example, an electrode (BB) was prepared by similarly filling a foamed nickel porous substrate (B) having a porosity of about 90%, which is a conventional substrate, with an active material.

The attachment of a current collector terminal was examined using these electrodes. In order to remove the active material 2 from the end of the electrode (AA) of the present invention and provide a mounting portion for the collector terminal, the active material 2 was mechanically removed by bringing a rotating roll of a metal brush into contact with the electrode surface. . The active material 2 was easily removed, the metal surface 4 was exposed, and was not damaged or broken (FIG. 3). Then, the exposed metal surface 4 was roll-pressurized to form a smooth surface. At this time, the pyramidal protrusions 3 were bent toward the through-hole surface side by pressure to form a flat plate having a uniform thickness (FIG. 4). The lead terminal 5 was spot-welded to this portion to obtain a welding strength of 5 kgf or more that does not cause terminal peeling during battery assembly (Fig. 5). In addition, 6 is a spot welding part.

On the other hand, in the conventional electrode (BB), the active material cannot be removed by breaking or damaging the substrate by such a simple method, and the active material in the substrate is removed by running water or ultrasonic waves. The lead terminal was welded by exposing the board, but the strength was weak at about 1 to 2 kgf, and reinforcement such as tape was necessary to prevent terminal peeling.

In addition, when the metal exposed portion 4 of the electrode (AA) of the present invention is double-folded as shown in FIG. 6 and the portion is seam welded, a very strong plate-like smooth surface is formed, and a reinforcing material. As a result, it was possible to form an end surface equivalent to that obtained by seam welding a strip-shaped metal plate. This end face could be a welded part of the current collector terminal by the indirect method in the battery constructed by winding the electrode plate.

[0012]

[Effect of device]

 As described above, the present invention can provide an electrode in which lead terminals can be easily processed and an electrode provided with a collector terminal portion by a simple method, and its industrial value is extremely high.

[Brief description of drawings]

FIG. 1 is a plan view of a substrate of an electrode of the present invention.

2 is a cross-sectional view of the electrode of the present invention, which is shown in FIG.
It corresponds to a section.

FIG. 3 is a plan view (a) and a sectional view (b) in which an active material is removed from the electrode of the present invention.

FIG. 4 is a perspective view of an essential part of the electrode of the present invention before and after pressing.

FIG. 5 is a plan view of an electrode after the current collector terminal of the present invention is attached.

FIG. 6 is a cross-sectional view showing a state in which a bent current collecting terminal portion of the present invention is formed.

[Explanation of symbols]

 1 Through Hole 2 Active Material 3 Protrusion 4 Metal Surface 5 Lead Terminal 6 Spot Weld

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masahiko Oshiya 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Yuasa Corporation

Claims (3)

[Scope of utility model registration request] 1. A paste-type electrode having as a substrate a core body having a structure in which square through holes of pyramidal protrusions are alternately arranged in opposite directions, and the substrate core body is exposed at an end of the electrode to form a smooth surface. A paste-type electrode characterized in that 2. The paste electrode according to claim 1, wherein a lead terminal or a strip-shaped metal plate is welded to the smooth surface of the electrode to provide a current collecting terminal. 3. The paste type according to claim 1, wherein the exposed portion or the smooth surface of the substrate core of the electrode is bent to be doubled, and the bent portion is seam welded to provide a collector terminal. electrode.