JP3145231B2 - Spiral electrode body winding forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a spirally wound electrode body by forming a positive electrode plate and a negative electrode plate spirally with a separator interposed therebetween .

[0002]

2. Description of the Related Art As an apparatus for producing a spiral electrode body used in a cylindrical battery, an upper and lower guide block for a slide guide having a groove having a concave cross section is arranged in the longitudinal direction so as to face one of the right and left. A positive electrode plate is installed in the concave groove portion of the guide block, a negative electrode plate is installed in the other guide block, and a separator is installed in the concave groove portions of the upper and lower guide blocks so as to be different from the positive electrode plate and the negative electrode plate, After fixing one end in the longitudinal direction of the positive electrode plate and the negative electrode plate to the front surface and the back surface of the separator via an adhesive tape or the like, respectively, the center of the separator in the longitudinal direction is sandwiched by a winding shaft, and the separator is rotated. A device is used in which the positive electrode plate and the negative electrode plate are laminated and spirally formed.

In this spiral electrode body winding forming apparatus , the concave grooves of each guide block are formed corresponding to the widths of the positive electrode plate, the negative electrode plate, and the separator, respectively.
During the winding operation, the positive electrode plate, the negative electrode plate, and the separator slide in the concave groove portion and are guided by the concave groove portion, and are drawn and wound on the winding shaft side.

[0004]

However, since the separator is actually made of an extremely thin film such as a microporous film, wrinkles are likely to occur, and the separator is accurately guided along the concave groove of each guide block. Not always, the winding may be lifted or meandering during winding, and winding deviation may occur, and in extreme cases, the positive electrode plate and the negative electrode plate may directly contact and often cause defects such as internal short circuit. .

In order to prevent the occurrence of such winding failure, the separator must be wound carefully while being carefully guided so as not to be displaced from the concave groove of the guide block. In order to improve the product yield, a remarkable work efficiency is required. And the productivity had to be reduced.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to prevent a separator from being unwound during a winding operation, thereby improving the yield of an electrode body and the operation efficiency. An object of the present invention is to provide a winding forming device for a shaped electrode body.

[0007]

In order to achieve the above object, a spiral-shaped electrode body winding forming apparatus according to the present invention comprises:
On the upper surface, a groove with a concave cross section is formed on the upper surface.
Guy with the upper and lower guide blocks stacked
Two pairs of lock blocks are arranged on the left and right sides of the winding shaft so as to face each other.
One end of the separator is disposed in the groove of the upper guide block disposed on one of the left and right sides of the winding shaft, and the other end of the separator is disposed on the other side of the winding shaft. It is arranged in the groove of the lower guide block provided, and one of the positive electrode plate and the negative electrode plate is arranged in the concave groove of the lower guide block provided on the one side. The winding shaft side end is fixed to the lower surface of the separator, and the other one of the positive electrode plate and the negative electrode plate is disposed in the concave groove portion of the upper guide block disposed on the other side. The winding shaft side end is fixed to the upper surface of the separator, and the upper guide block is fitted in the concave groove of the upper guide block on the separator arranged in the concave groove of the upper guide block. Place a weight that can slide in the longitudinal direction, and Locking the longitudinal center of the regulator to the winding shaft, it become to rotate the take-up shaft.

[0008] Preferably, the lower surface of the upper guide block which faces the separator installed in the concave groove of the lower guide block, the said separator
Elastically pressed against the inner bottom surface of the concave groove of the lower block
In the state, a cushion material for winding around the winding shaft is provided.
It becomes.

[0009]

According to the present invention having the above-mentioned structure, since an appropriate load is applied to the separator by the weight, tension is applied to the separator during the winding operation, and the separator is tensioned in the concave groove portion. Is wound on the winding shaft without sliding from a predetermined winding position while sliding.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. Note that the expression “left toward the paper” or “right toward the paper” is used throughout the following description, but this is for convenience of explanation,
The present invention is not particularly limited.

1 to 4 show a winding device according to the present invention. This device comprises upper guide blocks 2a, 3a for sliding guides facing left and right with the winding shaft 1 interposed therebetween.
And the lower guide blocks 2b and 3b are arranged in a stacked state.

These guide blocks 2a, 2b, 3
Both a and 3c are made of a slippery material such as Delrin. The upper guide block 2a on the left side in FIG. 1 and FIG. 2 is for guiding the negative electrode plate 4, the lower guide block 2b is for guiding the separator 5,
It has a length corresponding to the length of the negative electrode plate 4, and has concave grooves 4 a and 5 a for guide having a width corresponding to the width of the negative electrode plate 4 and the separator 5 and an appropriate depth on each upper surface. I have.

The upper guide block 3a on the right side of FIG. 1 and FIG. 2 is for guiding the separator 5, and the lower guide block 3b is for guiding the positive electrode plate 6. And concave grooves 5a and 6a for guide having a width corresponding to the width of the separator 5 and the positive electrode plate 6 and having an appropriate depth are formed on the respective upper surfaces.

As for the respective widths, the width of the separator 5 is the widest, followed by the positive electrode plate 6 and the negative electrode plate 4, and the width of the concave grooves 4a, 5a, 6a is determined in consideration of these dimensions. Is set. In addition, a current extracting lead member is connected to the positive electrode plate 6 and the negative electrode plate 4, but they are omitted for the sake of convenience in order to avoid complication of the drawing.

In order to manufacture a spiral-shaped electrode body using the winding device having the above-described structure, first, the negative electrode plate 4 and the positive electrode plate 6 are respectively connected to the concave groove portions 4 of predetermined guide blocks 2a and 3b.
a and 6a. The separator 5 is installed on the lower guide block 2b and the upper guide block 3a so that the left and right sides thereof are different from the negative electrode plate 4 and the positive electrode plate 6, respectively.

At this time, on the left side of FIGS. 1 and 2, as shown in FIGS. 2 and 3, a guide plate 7 as a pressing member made of a slippery sheet material such as polypropylene is replaced with a cushion material 8 such as sponge. The upper guide block 2a is fixed to the lower surface of the upper guide block 2a via the through hole, and the upper guide block 2a is mounted on the separator 5 provided in the concave groove 5a.
It is elastically pressed upward. Although the guide plate 7 may be directly fixed to the lower surface of the upper guide block 2a, it is preferable that the guide plate 7 is attached via the cushion material 8 in order to prevent the separator 5 from being damaged.

In the upper guide block 3a on the right side in FIGS. 1 and 2, a weight 9 which fits into the concave groove 5a and slides is installed on the separator 5 as shown in FIG. Thus, the separator 5 is pressed against the weight 9 and pressed against the concave groove 5a.

Further, a weight 10 is provided on the upper surface of the upper guide block 2a on the left side in FIGS. 1 and 2 to prevent the negative electrode plate 4 from floating from the concave groove 4a. In addition, in order to prevent the negative electrode plate 4 from being deformed by a load, the weight 10 is simply installed on the upper surface of the upper guide block 2a that protrudes on both sides without directly contacting the negative electrode plate 4.

Next, the opposite ends of the negative electrode plate 4 and the positive electrode plate 6 in the longitudinal direction are adhered to the front and back surfaces of the separator 5 by an adhesive tape 11, respectively.

After completion of the above preparation, the holding portion 1a cut from one end of the winding shaft 1 is inserted perpendicularly to the center of the separator 5 and rotated in the direction indicated by an arrow in the drawing, whereby the separator 5 is inserted into the concave groove portion. It is drawn toward the winding shaft 1 while being guided while sliding inside 5a, and wound around its outer periphery.

The negative electrode plate 4 and the positive electrode plate 6 are also provided with respective grooves 4a, 6a in close contact with the front and back of the separator 5.
It is drawn to the take-up shaft 1 side while sliding inside, and is wound spirally around its front and back with the separator 5 interposed.

At this time, the separator 5 located on the left side in FIGS. 1 and 2 causes relative sliding between the guide plate 7 and the concave groove 5a with an appropriate frictional force. The separator 5 located on the right side of the drawing is drawn to the winding shaft 1 side while sliding along the concave groove portion 5a in a state where an appropriate load is applied by the weight 9, so that an appropriate tensile load acts. The concave grooves 5
It is guided accurately within a and is wound with sufficient accuracy.

After the winding is completed, the winding end is fixed with the same adhesive tape 11 as described above, and the wound electrode body is pulled out from the winding shaft 1 to finish the winding operation.

Next, in order to confirm the effect of the winding device of the present invention , the relationship between the tensile load applied to the separator, the rate of occurrence of winding deviation, and the rate of damage to the separator was examined for a spiral lithium battery as an example. The results shown in Table 1 were obtained.

The separator has a width of 28 mm and a length of 600.
The negative electrode plate 4 is a metal lithium sheet having a width of 23.5 mm, a length of 200 mm and a thickness of 0.2 mm, and the positive electrode plate 6 is a width of 26 mm and a length of 190 mm.
A manganese dioxide mixture sheet having a thickness of 0.5 mm was used. Each guide block 2a, 2b, 3a, 3c is made of Delrin, and its shape and dimensions are 300 mm in length, 50 mm in width,
The thickness was 5 mm (excluding the concave grooves). The width and depth of each of the concave grooves 4a, 5a, 6a were formed according to the dimensions of the separator, the negative electrode plate, and the positive electrode plate. The upper guide block 2 for pressing and holding the separator 5
A polypropylene sheet having a length of 250 mm, a width of 27 mm and a thickness of 1 mm was attached to the lower surface of a through a sponge having a length of 200 mm, a width of 25 mm and a thickness of 3 mm.

[0026]

[Table 1] From the results shown in Table 1, the tensile load was 0.01 to 0.05.
It has been found that when the load is small at kgf, winding deviation may occur, and when the load is set at 7 to 10 kgf, the tensile load may cause damage such as breakage of the separator. Therefore, in this example, it is desirable to set it to about 0.1 to 6 kgf.

Next, based on the above results, a winding method using the apparatus of the present invention when the tensile load is set to 4 kgf,
When compared with the conventional device that winds with no load,
The occurrence rate of winding deviation was 8/100 in the apparatus , but less than 1/100 in the apparatus of the present invention, and it was confirmed that the effect of preventing the winding deviation by the apparatus of the present invention was sufficient.

Note that since the thickness and material of the separator vary depending on the capacity and type of the battery, it is sufficient to set an optimum load according to the type of battery, not limited to the range of the tensile load exemplified above. Not even.

[0029]

As described in detail in the above embodiments, in the spiral electrode body winding forming apparatus according to the present invention, an appropriate load is applied to the separator, and the separator is wound around the winding shaft. Since the tension is always applied to the separator, the separator slides along the concave groove provided in the guide block and is pulled toward the winding shaft. Therefore, the separator does not meander during the winding, and problems such as winding deviation and a short circuit between the positive and negative electrodes due to the deviation can be prevented. Further, since the working speed is improved as compared with the conventional apparatus which requires careful work while taking care of prevention of winding deviation, there is an advantage that the working efficiency and the productivity are improved in addition to the improvement of the yield.

Further, a cushion is attached to the lower surface of the upper guide block facing the separator provided in the concave groove of the lower guide block, and the separator is elastically pressed by the cushion against the inner bottom surface of the concave groove of the lower block. When the separator is wound around the take-up shaft, a well-balanced tension can be applied to the separators on both sides of the take-up shaft, and the cushioning material protects the separator from being damaged during the take-up operation. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a prefectural assembly device used in the device of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding shaft 2a, 3a Upper guide block 2b, 3b Lower guide block 4 Negative electrode plate 5 Separator 6 Positive electrode plate 4a, 5a, 6a Recessed groove 7 Guide plate (pressing member) 8 Cushion material 9 Weight 11 Adhesive tape

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hidetoshi Naito 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (56) References JP-A-5-151986 (JP, A) Sho-59-219868 (JP, A) Actually open Sho-57-90574 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 4/04 H01M 10/00-10/40

Claims (2)

(57) [Claims] 1. A winding shaft and each of the winding shafts
A guide block pair is arranged on the side, and each guide block
An upper guy with a pair of concave grooves on the top surface
Switch consisting of a stacked structure of
A spiral forming device for forming a spiral electrode body, wherein one end of a separator is disposed in the groove of an upper guide block disposed on one of the left and right sides of the winding shaft, and the other end of the separator is provided. Is disposed in the groove of the lower guide block disposed on the other side of the winding shaft, and one of the positive electrode plate and the negative electrode plate is disposed in the concave groove of the lower guide block disposed on the one side. And the end portion of the electrode plate on the winding shaft side is fixed to the lower surface of the separator, and either the positive electrode plate or the negative electrode plate is provided in the concave groove portion of the upper guide block provided on the other side. Or the other end is arranged and the winding shaft side end of the electrode plate is fixed to the upper surface of the separator, and the upper guide block is placed on the separator arranged in the concave groove of the upper guide block. Fit into the concave groove and in the longitudinal direction Placing the dynamic possible weights, locking the longitudinal center portion of the separator to the winding shaft, the winding forming apparatus Spiral electrode body formed by rotating the take-up shaft. 2. A cushion material is attached to a lower surface of the upper guide block facing the separator provided in the concave groove of the lower guide block, and the cushion is used to attach the separator to the inside of the concave groove of the lower block. The spiral-shaped electrode body winding forming apparatus according to claim 1, wherein the spiral-shaped electrode body is elastically pressed against a bottom surface.