JPS5920758Y2 - Sintered winding battery electrode plate - Google Patents

Description

[Detailed description of the invention] Conventionally, in manufacturing a sealed storage battery, a belt-shaped sintered anode plate and a cathode plate of a predetermined length are spirally wound in a cylindrical metal container with a belt-shaped separator interposed therebetween. There is a method in which the wound cathode plate is inserted into the container, and the wound cathode plate on the outer periphery is brought into contact with the inner wall of the container, making the container one polarity. The part is usually in the state where the sintered layer containing the active material has been cut, so when inserting the wound electrode plate group or due to vibration etc., the active material at the end is particularly likely to fall off, and it may fall off. Active materials have drawbacks that can cause short-circuit accidents.

In order to prevent this, for example, it is possible to completely cover the edges of the electrode plate with molten synthetic resin, etc., but this is laborious, lacks reliability, and is uneconomical due to the consumption of coating material. It has the following disadvantages.

Furthermore, the diameter of the wound electrode plate group varies, and the electrode plate does not have any elasticity to repel the winding, so there are cases where it is not possible to properly contact the outer circumferential electrode plate with the inner wall of the container. It is unstable, and there are other disadvantages such as fluctuations in the contact state due to vibrations, etc., and fluctuations in battery voltage.

In order to eliminate the above-mentioned drawbacks as much as possible, the present invention does not require any separate covering member, provides a simple and strong protection against falling off of the active material, and when wound and housed in a battery container, The present invention provides a sintered winding battery electrode plate with improved contact with the inner wall of the container, in which at least both edges of the band-shaped sintered layer 2 are melted in a U-shape to form a U-shaped melted edge. 3a and melting both ends of the strip-shaped core metal 1, which is made of a metal different from the metal constituting the sintered layer, in a U-shape, and melting the metal of the melted edge 3a and the core metal 1.
A U-shaped molten alloy layer 7 made of metal is formed and hollowed out.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

Figures 1 and 2 show an example of a strip-shaped sintered battery plate a cut to a predetermined length obtained by the present invention, and a plate of a different polarity is placed inside a predetermined cylindrical battery container. It is wound and inserted as a wound electrode plate group by a conventional method via a band-shaped separator, and its structure is generally the same as that of a conventional one.

That is, 1 indicates a belt-shaped core metal made of iron or mild steel in which countless small holes are punched out to a predetermined thickness, and the core metal is usually coated with a nickel plating layer on its surface. .

A slurry consisting of nickel powder and adhesive is filled and applied to a predetermined thickness on both sides of the core metal 1 coated with the nickel plating layer, and the resulting sintered layer 2 is bonded together by drying and sintering. ing.

The pores of this sintered layer 2 contain a known positive active material or negative active material filled by a normal active material filling process (not shown). Composed of boards.

Although the above structure is the same as that of a conventional sintered electrode plate, according to the present invention, at least the sintered layer 2 of the edge 3 of the electrode plate a is melted to generate a molten edge 3a. urge

The melting is achieved using a plasma arc, an electron beam, or the like.

In this way, the porous melted edge 3a of the sintered layer 2 prevents the active material from falling off from the edge of the conventional electrode plate by the simple operation of melting the sintered layer. I can do it.

The edges of the sintered layer 2 are generally melted on both sides as shown in the figure.

The edge melting is generally performed on both edges as shown in the figure.

The melting operation can be performed either before or after the active material filling process is performed on the sintered substrate, but especially when it is performed before the filling process, it is necessary to prevent the active material from filling the cut edges in advance. At the same time, it is advantageous in that it provides a superior melted edge 3a of the sintered layer compared to the case where the melted edge is melted after filling.

As shown in the first figure, in addition to performing the melting operation of the sintered layer 2 on the edge 3 of the electrode plate, both edges 4 in the length direction of the electrode plate are connected to both ends of the melted edge 3a. 5 to form the fused side edges 4a, 5a of the sintered layer to form a U-shaped fused edge 3a, 4a, 5a that surrounds the sintered layer 2 at the end 6 of the electrode plate as a whole. It is possible to better prevent the active material from falling off from the end portion 6.

In this case, according to the present invention, the melting is performed not only by melting the sintered layer but also by performing the above-mentioned U-shaped melting of the core metal 1 on the lower surface of the sintered layer, so that the nickel constituting the sintered layer and the iron of the core metal are melted. Alternatively, a molten alloy layer 7 with mild steel is generated.

Thus, the tensile strength of the core metal 1 is 18 to 20 kg in the case of iron.
/mm2 becomes 25 to 3 due to the iron-nickel alloy.
It improved to 0 kg/mm2.

The formation of this alloy layer 7 gives the electrode plate increased strength and a slight degree of repulsion against winding, and brings the electrode plate into contact with the inner wall of the container regardless of the variation in diameter when the winding is inserted.
This has the effect of increasing contact pressure and reducing voltage fluctuations caused by vibrations seen in conventional wound electrode plates.

FIG. 3 shows the above-mentioned two melted edges 3a. In addition to 3a, the above-mentioned fused edges 4 are also formed along the entire length along both edges in the length direction of the electrode plate.
a, 5a were formed, which resulted in an effect of preventing the active material from falling off and an improvement in the strength and elasticity of the electrode plate.

In this way, the cathode plate or the anode plate, or both, obtained by performing the steps of melting the edges of the sintered substrate and filling the active material before or after the present invention, or both, were selected, and a wound electrode plate group was formed by a conventional method. It is used by inserting it into a manufactured battery container.

FIG. 4 shows an efficient and preferable manufacturing method for the wound electrode plate of the present invention according to the embodiment shown in FIG. In this state, a belt-shaped molten part 3A and a molten alloy layer 7 of the required width to form the molten edges 3a, 3a are formed along the planned cutting line 8 (shown by a phantom line) and on both sides thereof. The above-mentioned melting operation is performed on one or both sides of the sintered layer so as to form a back-to-back U-shape in opposite directions, and then the sintered layer is cut in the center of the melt line 3A by a conventional method. As a result, a sintered substrate having a molten edge 3a and a molten alloy layer 7 on the edge 3 of each electrode plate is obtained.

When this substrate is impregnated and filled with an active material by a conventional method to form an electrode plate, a battery-wound electrode plate can be obtained efficiently without waste.

In this way, according to the present invention, at least both edges of the band-shaped sintered layer 2 are melted in a U-shape to form a U-shaped fused edge 3a, and a metal different from the metal constituting the sintered layer is melted. A sintered winding method in which both ends of a band-shaped core metal 1 made of Since it is used as a battery electrode plate, not only is the active material prevented from falling off from the edge of the strip-shaped electrode plate, but also when it is made into a wound electrode plate, the molten edge 3a is given repellency against winding. Therefore, it brings about contact with the inner wall of the battery container due to its repellency, increases the contact pressure, and provides effects such as providing a stable battery with reduced battery voltage fluctuation.

[Brief explanation of drawings]

Figure 1 shows an example of a winding battery electrode plate according to an example of the present invention.
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a plan view with a portion of the other side removed.
FIG. 4 shows a plan view of a part of a manufacturing example of the battery electrode plate of the present invention. 1...Core metal, 2...Sintered layer, 3...
...edge, 3a...melted edge, 4,5...
...Side edges, 4a, 5a...Both melted edges, a.
... Electrode plate, sintered substrate, 7 ... Molten alloy layer.

Claims (1)

[Scope of utility model registration request] At least both ends of the belt-shaped sintered layer 2 are melted in a U-shape to form a U-shaped fused edge 3a, and both ends of the belt-shaped core metal 1 are made of a metal different from the metal constituting the sintered layer. A sintered winding battery electrode plate is formed by melting the metal in a U-shape to form a U-shaped molten alloy layer 7 formed from the metal of the molten edge 3a and the metal of the core bar 1.