JPH08185885A - Manufacture of spiral electrode body - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a spiral electrode body allowing the easy connection of a current collection terminal by dividing strip type positive and negative electrode plates in a direction orthogonal with the long-sized sides thereof and winding a plurality of the divided positive and negative electrode plates in sequence through a separator. CONSTITUTION: A separator 11 is held in the slit of a winding shaft 13 and positive electrode plate 9s are fed one by one from an upper position to a gap between the layers of turns of the separator 11, while negative electrode plates 10 are fed one by one from a lower position to a gap. Before the first electrode plates 9 and 10 are fed to the gap of turns of the separator 11, an auxiliary separator 12 is fed to the gap, thereby preventing the leading ends of the plates 9 and 10 from coming in direct contact with the separator 11. When the second plates 9 and 10 are fed, the rotation of the shaft 13 is stopped and the second plates 9 and 10 are fed after the similar feed of an auxiliary separator 12. In this way, the preset number of the plates 9 and 10 is inserted in the gap of the separator 11 and finally, the ends of the plates 9 and 10 as well as the separators 11 are secured with a tape, thereby completing a spiral electrode body. According to this construction, no displacement of superposition occurs in the upper and lower ends of the electrode bodies, and a current collection terminal can be easily welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spirally wound electrode body used in a cylindrical battery.

[0002]

2. Description of the Related Art Conventionally, a spirally wound electrode body has an anode plate 1 and a cathode plate 2 each made of a long product as shown in FIG. 2 and a separator plate 3 as shown in FIG. It was manufactured by being wound up in a spiral shape by the winding shaft 4. In addition, 5 is an electrode plate 1, 2.
This is an auxiliary separator plate for preventing the separator plate 3 from being damaged by burrs or the like at the tip of the.

[0003]

When a spirally wound electrode body is manufactured by using the long one-piece anode plate 1 and cathode plate 2 by such a manufacturing method, the electrode plates 1 and 2 meander and are shown in FIG. As shown in the drawing, the height difference h is generated at the end of the spirally wound electrode body 6, causing a problem that welding with the current collecting terminal 7 becomes difficult. This problem can be solved by increasing the straightness of the electrode plates 1 and 2 and the parallelism of the electrode plate width, but it becomes difficult to increase the straightness and the parallelism as the electrode plate becomes longer. In particular, as shown in FIG. 2, a paste type electrode plate using a nickel foam or a fibrous mat as a base material of the electrode plate has a terminal 8 made of a nickel steel plate connected to a current collecting terminal attached to an end thereof. It was
In order to manufacture the electrode plate 1 or 2, the base material is coated with a paste-like active material, dried and roll-pressed to a predetermined thickness. When pressed in the longitudinal direction (direction A in FIG. 2), the electrode plate was warped due to the difference in elongation between the electrode plate and the steel plate, and the straightness and parallelism of the electrode plate were reduced. Note that the electrode plate does not warp when pressed in the direction perpendicular to the lengthwise direction of the electrode plate (direction B in FIG. 2), but the width of the pressing machine is limited, so long electrode plates are pressed in this direction. I couldn't.

As described above, when the long electrode plate 1 or 2 to which the terminal 8 is attached is roll-pressed, the electrode plate warps. Therefore, conventionally, a method of attaching the terminal 8 to the electrode plate after roll-pressing has been adopted. It was That is, a masking tape is attached to the upper end of the base material, the paste-like active material is applied, dried, and roll-pressed to a predetermined thickness, the tape is removed, and the terminal 8 is attached to the removed portion by spot welding. Was there. Such a method can increase the straightness and parallelism of the electrode plate, but has a problem that the process becomes complicated. Moreover, even if such a method is adopted,
The longer the pole plate, the more difficult it is to obtain straightness and parallelism.
The above problems could not be completely eliminated.

The present invention has been made in view of the above problems, and an object thereof is to simplify the conventional manufacturing method and prevent the displacement of the overlapping of the electrode bodies at the upper and lower ends. That is, it is to provide a method of manufacturing a spirally wound electrode body in which a collector terminal can be easily connected.

[0006]

In order to achieve the above object, the present invention divides a strip-shaped anode plate and cathode plate in a direction perpendicular to the longitudinal direction, and divides the plurality of anode plates 9 and cathodes. It is characterized in that the plate 10 is sequentially wound via the separator 11. Then, the anode plate 9 and the cathode plate 10 are
It is preferably manufactured by rolling in a direction perpendicular to the longitudinal direction.

[0007]

Since the anode plate 9 and the cathode plate 10 which are divided into short lengths are used, the winding can be performed while correcting the position of the electrode plate. Further, the short electrode plate has less warp, and the straightness and parallelism of the electrode plate can be increased. In particular, when the paste type electrode plate with the terminal 8 attached to the upper end is used, it can be pasted after the terminal 8 is attached to the base material and can be rolled in the direction perpendicular to the longitudinal direction, so that it is parallel to the straightness of the electrode plate. The degree, that is, the dimensional accuracy can be improved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing the method of the present invention. Reference numeral 9 is an anode plate, a terminal made of a nickel steel plate is attached to the upper end of a strip-shaped nickel foam or fibrous mat by seam welding, and a nickel paste is attached to this foam After applying the active material and drying it, the length in the long direction is from 200 mm to 300 m.
It is cut into about m and rolled by a roll in a direction perpendicular to the longitudinal direction to a predetermined thickness. Reference numeral 10 denotes a cathode plate. A terminal made of a nickel steel plate is attached to the lower end of a strip-shaped nickel foam or a fibrous mat by seam welding, and a paste active material of a hydrogen storage alloy is applied to the foam and dried, It is cut so that its length in the lengthwise direction is approximately the same as that of the anode plate, and is rolled by a roll in a direction perpendicular to the lengthwise direction so as to have a predetermined thickness. Reference numeral 11 is a separator made of a nonwoven fabric of polyamide fiber, 12 is an auxiliary separator made of the same material as the separator 11, and 13 is a winding shaft.

In FIG. 1, one separator plate 11 is sandwiched between the winding shafts 13, and the anode plates 9 are fed one by one from above between the separator plates 11 while supplying from the left side and the right side. The cathode plates 10 are fed one by one from below. The auxiliary separator plate 12 is fed between the separator plates 11 before the first electrode plates 9 and 10 are inserted between the separator plates 11.
Make sure that the tips of and 10 do not directly contact the separator 11. This is due to the burr at the tips of the electrode plates 9 and 10 and the like.
This is for protecting the anode plate 9 and the cathode plate 10 from being short-circuited due to damage to the anode plate 1. Next, when the insertion of the first electrode plates 9 and 10 is completed and the second electrode plates 9 and 10 are fed, the rotation of the winding shaft 13 is stopped and before the first electrode plate is fed. Similarly, the auxiliary separator plate 12 is fed in, and the second electrode plates 9 and 10 are fed in. In this way, a predetermined number of electrode plates 9 and 10 are inserted between the separator plates 11, and finally the ends of the electrode plates 9 and 10 and the separator plate 11 are taped to complete the spiral electrode body.

In this way, 100 spiral electrode bodies were produced by winding the anode plate 9 and the cathode plate 10 between the separator plates 3 by 3 pieces each, and welding the collector terminals 7 as shown in FIG. I was able to weld. Further, for comparison, a spirally wound electrode body using the electrode plates 9 and 10 of the above embodiment rolled in the longitudinal direction and having a length corresponding to three plates was manufactured by a conventional method.
When the individual terminals were manufactured and the current collector terminal 7 was attempted to be welded, there were two that could not be welded as they were. In this embodiment, the electrode plates 9 and 10 have the shapes shown in FIG. 2, but the terminal 8 may be provided with a lead plate protruding upward. In this case, the upper ends of the lead plates can be aligned, which facilitates welding. Further, the plurality of divided electrode plates are not limited to the one obtained by cutting one strip-shaped electrode plate, and may be those in which electrode plates having the same shape are separately manufactured.

[0011]

Since the present invention is configured as described above, it has the following effects. (1) According to the first aspect, the length of the electrode plate is short, so that the electrodes can be rolled up while correcting their positions one by one. Therefore, it is possible to provide the spiral electrode body in which the current collecting terminal 7 can be easily welded. (2) According to claim 1, since the electrode plate with less warp can be used, there is no difference in height at the end when wound.
It is possible to provide a spiral electrode body that can easily weld the current collecting terminal 7. (3) According to claim 2, since the straightness and the parallelism of the electrode plates 9 and 10 are excellent, there is no deviation at the end of the electrode plate when the electrode plates are wound, and welding with the current collecting terminal 7 is easy. A spiral electrode body can be provided. (4) According to claim 2, when the paste type electrode plate is manufactured, the terminal may be attached to the base material and then pasted, and there is no need to mask or remove the tape as in the conventional case, and the terminal can be attached by spotting. It can be done continuously by seam welding instead of welding. Therefore, the manufacturing method can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a plan view of an electrode plate according to the present invention or a conventional method.

FIG. 3 is an explanatory diagram showing a conventional method.

FIG. 4 is a side view showing a spirally wound electrode body and a collector terminal manufactured by a conventional method.

[Explanation of symbols]

 9 Anode plate 10 Cathode plate 11 Separator plate

Claims (2)

[Claims] 1. A strip-shaped anode plate and cathode plate are divided in a direction perpendicular to the longitudinal direction, and the plurality of divided anode plates (9) and cathode plates (10) are separated by a separator (11). A method for manufacturing a spirally wound electrode body, which comprises sequentially winding. 2. A method for manufacturing a spirally wound electrode body, wherein the anode plate (9) and the cathode plate (10) according to claim 1 are manufactured by rolling in a direction perpendicular to the longitudinal direction.