JPS63164170A - Manufacture of cylindrical nonaqueous electrolyte cell - Google Patents

Abstract

PURPOSE:To make it possible to wind a separator securely and easily so as to improve the working efficiency, to eliminate a damage of the separator, and to prevent the inner short circuit, by winding the separator while it is pressed in between a conductive base material and a collector rod with a pressing plate, at the starting of the winding, and using the collector rod as the winding core. CONSTITUTION:A positive electrode active substance 16 is removed from one end of a positive electrode plate 1, where a collector rod 2 is fixed by a welding or the like. Then after covering the periphery of the positive electrode plate 1 with a belt- formed separator 3 of the length more than two times that of the positive electrode plate 1 to envelope the collector rod side, the separator 3 is pressed in by a pressing plate 4 with the width as long as that of the separator 3, to the connection between the collector rod 2 and the conductive base material 1a. In such a condition, the conductive base material 1a is started to wind in the direction not turning back the conductive base material 1a, around the collector rod as the winding axis, and when the separator 3 is held sufficiently between the conductive base material 1a and the collector rod 2, the pressing plate is removed. In such a way, as well as the separator can be wound securely and easily to improve the working efficiency, a damage of the separator and the inner short circuit can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (#, Field of Industrial Application) The present invention relates to a method of manufacturing a cylindrical non-aqueous electrolyte battery that simplifies the manufacturing process of spiral TrL electrodes. be.

(Prior Art) Generally, a cylindrical non-aqueous electrolyte battery is composed of an electrode portion in which positive and negative electrode plates are spirally wound through a separator.

Conventionally, the method for manufacturing this spiral electrode group was to sandwich the center part of a separator, which has a length more than twice the length of the electrode plate, between a pair of half rotating shafts with a semicircular cross section, and rotate the rotating shafts in this state. JP-A-61-74267 discloses an electrode group in which a separator is interposed between the two electrode plates and the electrodes are wound to form a spiral electrode group.

In addition, after wrapping at least one of the positive electrode plate or the negative electrode plate with a separator, the two electrode plates are overlapped and the end of one of the electrode plates is sandwiched between a pair of semicircular cross-section half-split screws. JP-A-5-1--157-14, which involves winding up the bipolar plates while rotating the rotating shaft to form a spiral electrode part.
However, in both cases, in order to remove the rotational motion after forming the spiral electrode section, a cavity is created in the center of the spiral electrode section, which not only reduces the volumetric efficiency, but also requires the removal of the rotating shaft. In such a case, the separator may shift and cause an internal short circuit.

Therefore, after fixing a current collector rod by spot welding etc. to one end of one electrode plate in which an active material is supported on a conductive base material such as lath metal, punched metal, or wire mesh, a current collector rod is fixed by spot welding etc. One electrode plate is covered with a separator so as to wrap around the current collector rod side, and the current collector rod is used as a winding core and is wound together with the separator and the other electrode plate to form a spiral t.
Lol! The county and Toshimano are disclosed in Publication No. 33574 of 1983.

As mentioned above, by using the current collector rod as a winding core, no cavity is created in the center of the spiral electrode part, and the diameter of the current collector rod can be made smaller than that of a half-split rotating shaft, which improves volumetric efficiency. ” I can do it by making you do it.

However, since it is not necessary to pull out the main rod s after winding is completed, it is possible to prevent internal short circuits due to displacement of the separator.

However, this method has a problem in that the separator slips when the bipolar plates begin to be wound around the current collecting rod, making it impossible to reliably wrap the separator around the current collecting rod.

Therefore, it was proposed in JP-A-60-79 to cover one electrode plate with a separator so as to wrap around the current collector rod, and to weld and fix the separator to the exposed part of the conductive base material to integrate it with one electrode plate.
It is disclosed in Japanese Patent No. 672.

However, since the separator is fused to the conductive base material, if a large tension is applied to the separator at the start of winding, the fused portion may peel off and the separator may tear, causing an internal short circuit.

In order to prevent this separator from peeling off, if the fused portion is made wider, the active material must be removed and the exposed portion of the conductive substrate must be made wider, resulting in a loss of positive electrode capacity I. However, in order to improve the fusion of the separator, the active material must be completely removed, which poses a problem in that the removal process becomes troublesome.

(Problems to be solved by the invention) The above-mentioned conventional proposal, JP-A-61-74267,
The manufacturing method disclosed in Japanese Patent Publication No. 54-45744 has the problem that a cavity is formed in the center of the spiral electrode group, resulting in a significant decrease in volumetric efficiency, and that the separator is displaced when the rotating shaft is removed, causing an internal short circuit. There is.

Furthermore, the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 60-33574 has a problem in that it is not possible to reliably wrap the separator around the 1 & electric rod.

Furthermore, in the manufacturing method disclosed in JP-A No. 60-79692, the separator may be torn, causing an internal short circuit, and the exposed portion of the conductive base material may be wide, resulting in a loss of positive electrode capacity. .

The present invention has been made in view of the above-mentioned problems, and it is possible to wind the separator reliably and easily, significantly improving workability, and to create a cylindrical well that does not damage the separator and prevent internal short circuits. The purpose of the present invention is to provide a method for manufacturing an aqueous electrolyte battery.

1 Configuration of the Invention] (For Solving Problems and 11) The method for manufacturing a cylindrical non-aqueous electrolyte battery of the present invention is to After covering the current collecting rod with a band-shaped separator so as to wrap it around, the separator is pressed into the connecting part between the current collecting rod and the conductive base material using a pressing plate, and in this state, one electrode plate is connected to the other through the separator with the current collecting rod as the axis. The feature is that the electrode plate is wound and the holding plate is pulled out when the separator is sufficiently sandwiched between the two electrode plates.By sandwiching the separator at the beginning of winding, the spiral shape of the electrode group is ensured. And it can be easily wound.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 shows the connection part of the current collector rod of the spiral electrode group used in the same example. In the figure, 1 is made of stainless steel,
A positive electrode active material 1 is placed on a mesh-like conductive base material 1a made of Soclu or the like.
1]. The positive electrode active material 1b is removed from one end of the positive electrode plate 1, and the tLt rod 2 is fixed thereto by welding or the like.

Next, as shown in FIG. 1, after covering the periphery of the positive electrode plate 1 with a band-shaped separator 3 having a length more than twice that of the positive electrode plate 1 so as to wrap around the FE electric rod side, as shown in FIG. Pushing the separator 3 into the connecting part between the current collecting rod 2 and the conductive base material 1a using a pressing plate 4 having a considerable width.
In this state, the conductive base material 1a starts winding around the AT rod 2 as the rotation axis in a direction in which it is not folded back, and the separator 3 is sufficiently inserted between the conductive base material 1a and the current collecting rod 2 as shown in FIG. At this point, the holding plate 4 is pulled out. In this case, the timing for removing the presser plate 4 depends on the thickness of the presser plate 4,
By removing the holding plate 4 when the winding angle of the current collecting rod 2 is within the range of 45 to 90 degrees, the separator 3 can be sandwiched between the separators 3 and 3.

Next, a negative electrode plate (not shown) made of an alkali metal such as lithium metal formed into a long strip is laminated on the positive electrode plate 1 with a separator 3 in between, and the negative electrode plate is placed on the outside around the main rod 2. A spiral electrode group is formed by winding the electrode.

After inserting this spiral electrode group into a battery gate (not shown) that also serves as a negative electrode terminal and injecting a non-aqueous electrolyte, the open end of the battery cage is inserted into a sealing body (not shown) that also serves as a positive terminal. A cylindrical non-aqueous electrolyte battery is completed by sealing the battery.

The width of the holding plate 4 used here is set to be greater than the width of the separator 3 so that the separator 3 can be held down sufficiently, and the thickness is set to 1,720 to 1 1/2 inches with respect to the diameter of the current collecting rod 2.
It is desirable to set it to /2. In this case, the holding plate 4
When the thickness of is made smaller than 1/20 of the diameter of the current collector rod 2,
Immediately after the start of winding, it becomes very difficult to pull out the pressing plate 4, and the strength becomes weak, making it impossible to press the separator 3 sufficiently. Furthermore, if the thickness of the holding plate is larger than the diameter of the current collector rod 2, which is 172, it will not be possible to push the separator 3 deeply. You will not be able to absorb it.

In this way, when starting winding, press the separator 3 with the plate 1.
By winding the separator daughter 3 while pushing it between the conductive base material 1a and the current collector rod 2, it is possible to accurately hold the separator daughter 3 between the conductive base material 1a and the current collector rod 2, so that the spiral electrode group can be formed reliably and easily. It can be wound around. Moreover, by using the current collector rod 2 as a winding core, a cavity is not formed in the center of the spiral electrode group, so volumetric efficiency can be improved, and there is no need to remove the & main rod 2 after winding is completed. Internal short circuits due to misalignment of the separator 3 can be prevented.

Note that the present invention is not limited to the above embodiments,
Various modifications can be made without changing the gist.

[Effects of the Invention] As explained above, according to the present invention, the separator can be wound reliably and easily, workability can be significantly improved, and the separator is not damaged and internal short strings can be prevented. A method for manufacturing a cylindrical non-aqueous electrolyte battery can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the manufacturing process of a spiral electrode group used in the present invention.

Claims (2)

[Claims] (1) A current collecting rod is fixed to one end of a conductive base material carrying an active material, and a separator is interposed between one electrode plate and the other electrode plate, and the electrode is wound around the current collecting rod to form a spiral shape. A method for manufacturing a cylindrical non-aqueous electrolyte battery forming an electrode group includes a step of covering one of the electrode plates with a band-shaped separator so as to wrap around the current collector rod side, and a connecting portion between the current collector rod and the conductive base material. The separator is pushed in using a holding plate, and the separator is pushed in, and the bipolar plate is wound around a current collector rod, and the separator is sufficiently sandwiched in the separator, and the holding plate is pulled out. A method for manufacturing a cylindrical non-aqueous electrolyte battery. (2) The cylindrical shape according to claim 1, wherein the holding plate has a width larger than the width of the separator and a thickness of 1/2 to 1/20 of the diameter of the current collector rod. A method for manufacturing a non-aqueous electrolyte battery.