JPH03203161A - Manufacture of electrode plate - Google Patents

Abstract

PURPOSE:To manufacture continuously and stably an electrode plate uniformly coated with active material paste by installing a plurality of a pair of disc- shaped supporting members, which rotate on the lower side of a slit along the direction of width of a conductive core. CONSTITUTION:A conductive core 2 wound round a hoop 1 is supplied to a container 3. When the core 2 is passed through the container 3, active material paste 4 in the container 3 is applied to both sides of the core 2. The core 2 is passed between a plurality of a pair of facing disc-shaped supporting members 9 to correct the warp of the core 2 and passed through the center of an opening 5a of a slit 5 to scrape off excessive paste 4 and to adjust the thickness of the paste. When the core 2 passes through the members 9, the paste 4 near the core 2 is properly flowed, and the core 2 is stably and uniformly coated with a sufficient amount of paste 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for manufacturing an electrode plate, and particularly to a method for manufacturing an electrode plate in which the process of applying an active material paste is improved.

(Prior Art) Electrode plates made by applying active material paste to both sides of a long conductive core are used as electrodes for various batteries.

The electrode plate has conventionally been manufactured through a coating process in which an active material paste is coated on a conductive core body to a predetermined thickness. This process is carried out continuously using a manufacturing apparatus as shown in FIG. 5, for example.

That is, the hoop 1 is a conductive core 2 wound around the hoop 1,
A container 3 is arranged in the direction in which the conductive core 2 moves. The container 3 houses the active material paste 4, and a slitter 5 is arranged above it. The slitter 5 has a gap 5a as shown in FIGS. 6 and 7, and a pair of rod-shaped support members 29 facing each other and in contact with both surfaces of the conductive core body 2 are provided on the lower side of the slitter 5, as shown in FIGS. A plurality of sets are arranged in series along the width direction of the core body 2. A drying oven 6 is arranged above the slitter 5, and a rolling roll 7 is arranged above the drying oven 6. The rolling roll 7 consists of two rolls facing each other, and a coiler 8 for winding up the formed electrode plate is arranged at the rear stage.

Next, a method for manufacturing an electrode plate will be described with reference to the manufacturing apparatus described above. First, the conductive core 2 wound around the hoop 1 is supplied to the container 3.

When the conductive core 2 passes through the container 3, the active material paste 4 contained in the container 8 is applied to both sides of the conductive core 2. Continuing, the conductive core 2 passes between a pair of rod-shaped support members 29 facing each other, the warp is corrected, and the conductive core 2 passes through the center of the gap 5a of the slitter 5. At this time, the active material paste 4 applied to the conductive core 2 in excess
is scraped off, and the applied active material paste 4 is adjusted to a predetermined thickness. Next, the conductive core body 2 is supplied to a drying oven 6, where it is dried, and further pressurized with a rolling roll 7, and the formed electrode plate is wound up on a coiler 8.

However, in the conventional electrode plate manufacturing method, the active material paste 4 is applied to the conductive core 2 at the rod-shaped support member 29.
As a result, the active material layer of the electrode plate becomes brittle and the amount of active material in the electrode plate varies greatly.

Furthermore, in the conventional electrode plate manufacturing method, the active material paste 4 near the rod-shaped support member 29 flows in the direction of the arrow in FIG. 6, is pushed toward the lower part of the slitter 5, and stagnates there. For this reason, the active material paste 4 that was successively moved to the above location
The stagnant paste is further pressurized, and the water in the upper part of the paste gradually settles downward, thereby being dehydrated from the upper part. As a result, the dehydrated paste adheres to the lower part of the slitter 5 and becomes a fixed substance 4a, which gradually enlarges toward the gap 5a of the slitter 5, increasing the load resistance of the conductive core 2 passing through the gap 5a. Therefore, the active material paste 4 applied to the conductive core 2 is excessively scraped off by the enlarged adherents, resulting in a significant reduction in the amount of coating, and in some cases, even cutting the conductive core 2. There was a problem with getting there.

(Problems to be Solved by the Invention) The present invention has been made to solve the above-mentioned conventional problems, and is a method for continuously and stably manufacturing an electrode plate to which an active material paste is evenly applied. This is what we are trying to provide.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides the following methods: by applying an active material paste to a long conductive core and passing the conductive core through a gap in a slitter,
In the method for manufacturing an electrode plate, the method includes a coating step of adjusting the active material paste to a predetermined thickness, wherein a pair of mutually opposing disc-shaped discs are provided on the lower side of the slitter and rotate in contact with both surfaces of the conductive core. This is a method of manufacturing an electrode plate characterized by using a structure in which a plurality of supporting members are arranged in series along the width direction of a conductive core.

(Function) According to the present invention, the active material paste is adjusted to a predetermined thickness by applying the active material paste to a long conductive core and passing the conductive core through the gap of the slitter. In the method for manufacturing an electrode plate, the electrode plate manufacturing method includes a coating step in which a pair of disc-shaped support members facing each other that rotate in contact with both surfaces of the conductive core are placed on the lower side of the slitter in the width direction of the conductive core. By using a structure in which a plurality of sets are connected along the same line, it is possible to continuously and stably manufacture electrode plates to which the active material paste is evenly applied.

That is, a pair of rotating disc-shaped support members is arranged below the slitter along the width direction of the conductive core, and the conductive core is passed between these disc-shaped support members and supplied to the gap of the slitter. As a result, the warpage of the conductive core can be corrected, and the fluidity of the active material paste near the support member can be improved.

As a result, when the conductive core passes between the supporting members,
A sufficient amount of active material can be applied to the conductive core. In addition, since the support member rotates, the active material paste flows back into the container, eliminating the adhesion of the active material paste to the lower part of the slitter and excessive pressure, preventing the generation of stuck substances, and causing the active material paste to flow toward the gap side of the slitter. It can prevent stuck objects from becoming enlarged. Therefore, the conductive core whose warpage has been corrected passes through the center of the gap between the slitters, and the active material paste applied in excess on the conductive core is scraped off, so that the active material is uniform and has a predetermined thickness. Electrode plates with paste applied to a conductive core can be manufactured continuously and stably.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Example 1 FIG. 1 shows a manufacturing apparatus used for manufacturing the electrode plate of Example 1. The hoop 1 is formed by winding a conductive core 2, and a container 3 is disposed in the direction in which the conductive core 2 moves. The container 3 houses the active material paste 4, and a slitter 5 is arranged above it. The active material paste 4 is a mixture of 90 parts by weight of manganese dioxide, 10 parts by weight of graphite, polyacrylic acid, PTFE, and water. The slitter 5 has a gap 5a as shown in FIG. On the lower side of this slitter 5, as shown in FIG. Multiple sets are connected. A drying oven 6 is arranged above the slitter 5, and the drying oven 6
A rolling roll 7 is arranged above. The rolling rolls 7 are a pair of two rolls facing each other, and a coiler 8 for winding up the formed electrode plate is arranged at the rear stage.

Next, a method for manufacturing an electrode plate using the above-described manufacturing apparatus will be explained. First, a conductive core 2 made of, for example, lath metal and wound around a hoop 1 is supplied to a container 3. When the conductive core 2 passes through the container 3, the active material paste 4 contained in the container 3 is applied to both sides of the conductive core 2. Next, the conductive core 2 passes between a plurality of pairs of disc-shaped support members 9 facing each other, the warp is corrected, and the conductive core 2 passes through the center of the gap 5a of the slitter 5. At this time, the excess active material paste 4 applied to the conductive core 2 is scraped off, and the applied active material paste 4 is adjusted to a predetermined thickness. Further, the disk-shaped support member 9
When the conductive core 2 passes through, the active material paste 4 in the vicinity flows well in the direction of the arrow in FIG. 2, so that a sufficient amount of the active material paste 4 is applied to the conductive core 2. Furthermore, the active material paste 4 is prevented from forming a stuck substance and slitted.

The active material paste 4 is stably and uniformly applied to the conductive core 2 while preventing enlarged adherents from being formed on the side of the gap 5a of the groove 5. Next, the conductive core 2 is supplied to a drying oven 6, where it is dried, and further subjected to jx+ pressure by a rolling roll 7, and the formed electrode plate is wound around a coiler 8.

Comparative Example 1 A pair of rod-shaped support members 29 facing each other and in contact with both surfaces of the conductive core 2 are installed at the lower side of a slitter 5 as shown in FIGS. 6 and 7 as a manufacturing apparatus. Implementation N except for using a structure in which multiple sets are connected in a row along the direction
An electrode plate was manufactured in the same manner as in Example 1.

Regarding the electrode plates of Example 1 and Comparative Example 1 thus obtained, the amount of active material paste applied per unit area was examined. The results are shown in FIG.

As is clear from FIG. 8, in Example 1, the amount of coating remains constant even if the continuous running width time elapses, whereas in Comparative Example 1,
As the continuous operation time elapsed, the coating amount decreased significantly. This result shows that the manufacturing method of the present invention can continuously and stably manufacture an electrode plate having an active material paste applied uniformly.

Furthermore, when the number of defects in the manufacturing of the electrode plates of Example 1 and Comparative Example 1 was investigated, the number of defects in Example 1 was L/10 to L/5 of Comparative Example 1.

From this result, it can be seen that the manufacturing method of the present invention is excellent in productivity because the electrode plate can be manufactured stably.

In addition, although the manufacturing apparatus used in the above-mentioned Example 1 used the disk-shaped support member 9 having the same thickness, the present invention is not limited to this, and for example, as shown in FIG. A support member 19 may also be used.

By incorporating the disc-shaped support member 19 having such a shape, the active material paste can be more stably and uniformly applied to the conductive core.

0 [Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a method suitable for mass production that can continuously and stably manufacture electrode plates to which an active material paste is uniformly applied. can.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a manufacturing apparatus used in an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of main parts of the manufacturing apparatus shown in FIG. 1, and FIG. 3 is a slitter and disk in the manufacturing apparatus shown in FIG. 1. FIG. 4 is an explanatory view showing another example of the disk-shaped support member incorporated into the manufacturing apparatus used in the method of the present invention, and FIG. 5 is a perspective view showing a part of the disk-shaped support member, and FIG. 5 is the manufacturing apparatus used in the conventional method. FIG. 6 is an enlarged cross-sectional view of the main parts of the manufacturing apparatus shown in FIG.
FIG. 7 is a perspective view showing a part of the slitter and rod-shaped support member of the manufacturing apparatus shown in FIG. 5, and FIG. 8 is the amount of applied active material paste versus continuous operation time on the electrode plates of Example 1 and Comparative Example 1. FIG. 2... Conductive core, 4... Active material paste, 5...
・Slitter, 5a... Gap,

Claims (1)

[Claims] An electrode plate comprising a coating step of applying an active material paste to a long conductive core and adjusting the active material paste to a predetermined thickness by passing the conductive core through a gap in a slitter. In the manufacturing method, the slitter has a structure in which a plurality of sets of mutually opposing disc-shaped support members that rotate in contact with both surfaces of the conductive core are arranged in a row along the width direction of the conductive core on the lower side of the slitter. 1. A method of manufacturing an electrode plate, characterized by using an electrode plate.