JPH11162500A - Sheet body winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently, elastically deform a winding shaft for drawing it out, and effectively prevent the break of the winding shaft by forming the winding shaft with cemented carbide, and limiting the length of a slit extending in the shaft direction from the vicinity of the tip of the winding shaft supported with a pin within the range of the specified times the diameter of the winding shaft. SOLUTION: The length L of a slit 20 is made 18-20 times the diameter D of a winding shaft 12. If it is less than 18 times, a bamboo shoot phenomenon occurs and if it exceeds 20 times, the break of the winding shaft occurs. The winding shaft 12 moves in the arrow A1 direction integrally with a rotating cylinder 16, and slanting surfaces 22a, 22b formed at the tip of the winding shaft 12 come in contact with a supporting pin 18 and are supported. The winding start tip part of a sheet body is inserted into the slit 20 and wound. The winding shaft 12 moves in the arrow A2 direction, and the slanting surfaces 22a, 22b are separated from the supporting pin 18. The winding shaft 12 is elastically deformed in the direction narrowing the width of the slit 20 to reduce the diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a spirally wound sheet formed by sandwiching a belt-shaped sheet member in a slit of a reel, rotating the reel and laminating the sheet members in a spiral shape, and then pulling out the reel. The present invention relates to a sheet winding device for manufacturing the same.

[0002]

2. Description of the Related Art In a battery assembling process, for example, after a strip-shaped positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, a group of electrodes (a spiral body) is formed. In addition to the above, an operation of injecting an electrolyte into the battery can is performed.

[0003] In this case, various devices have conventionally been used to integrally wind the positive electrode plate, the negative electrode plate and the separator. This type of device generally includes a winding shaft having a slit formed in a diameter direction, and a tip of a separator is inserted into the slit while the tip of the winding shaft is rotatably supported by a support pin. In addition, the positive electrode plate and the negative electrode plate are arranged in an insulated state via the separator. Next, by rotating the winding shaft, the positive electrode plate and the negative electrode plate are integrally wound around the winding shaft with the separator interposed therebetween, and an electrode plate group is obtained.

Further, when the operation of pulling out the winding shaft from the electrode plate group is started, the tip of the winding shaft is detached from the support pin, and the winding shaft narrows the slit width by the tightening force of the electrode plate group. Elastically deform in the direction, and the tightening force is released. Therefore, the pull-out resistance of the winding shaft is reduced, and the winding shaft can be pulled out from the electrode plate group.

[0005]

By the way, when the electrode group is wound around the winding shaft, a large pressure is applied between the winding shaft and the electrode group due to tight tightening. Therefore, it has been pointed out that it is difficult to smoothly pull out the winding shaft from the electrode plate group, and the center portion of the electrode plate group is pulled out without being able to pull out the separator. .

Therefore, in order to obtain sufficient elastic deformation of the winding shaft, it is conceivable to extend the slit in the root direction of the winding shaft. However, when the slit becomes deeper than necessary, the bending stress near the tip of the winding shaft and near the slit base reduces the bending force of the winding shaft itself in a state where the tip of the winding shaft is held by the support pin during winding. There is a risk of exceeding. As a result, there is a problem that breakage tends to occur particularly in a winding shaft having a small shaft diameter.

SUMMARY OF THE INVENTION The present invention solves this kind of problem, and provides a sufficient amount of elastic deformation for pulling out a winding shaft, and a sheet winding capable of effectively preventing breakage of the winding shaft. The purpose of the present invention is to provide a device.

[0008]

In order to solve the above-mentioned problems, in the sheet winding apparatus according to the present invention, the winding shaft for spirally stacking the sheets is formed of a cemented carbide, The length of the slit extending in the axial direction from near the tip of the winding shaft supported by the pin is 18 times to 2 times the diameter of the winding shaft.
It is set within the range of 0 times.

Here, the length of the slit is one of the diameter of the winding shaft.
If it is less than eight times, the desired elastic deformation cannot be obtained, and the unwinding resistance of the winding shaft will increase, and a bamboo shoot as a winding deviation will occur. On the other hand, the length of the slit is 2
If it exceeds 0 times, a bending stress greater than the bending force of the winding shaft will be generated, and the winding shaft will be damaged. Therefore, by setting the length of the slit within the range of 18 to 20 times the diameter of the winding shaft, it is possible to effectively prevent the occurrence of bamboo shoots and the breakage of the winding shaft.

[0010] Further, as the winding shaft, the elastic modulus is 40000k.
gf / mm ^{2 to} 60000 kgf / mm ² ,
And a static bending force of 200 kgf / mm ^{2 to} 300 kgf
/ Mm ² is used. This makes it possible to more reliably prevent the occurrence of bamboo shoots and damage to the winding shaft.

Further, the sheet is a battery assembly having a positive electrode plate, a negative electrode plate, and a separator, and a high quality battery can be manufactured by efficiently and smoothly winding the battery assembly.

[0012]

FIG. 1 is a perspective view of a main part of a sheet winding apparatus 10 according to an embodiment of the present invention.

The winding device 10 includes a winding shaft 12 and the winding shaft 1.
2, a rotary cylinder 16 that can move forward and backward in the axial direction (direction of arrow A) and can rotate in the direction of arrow B under the guidance of the shaft holder 14, and a support pin 1 that supports the tip of the winding shaft 12.
8 is provided. A slit 20 is formed in the axial direction from the leading end of the winding shaft 12, and inclined surfaces 22a and 22b are formed at the leading end of the winding shaft 12 so as to be directed outward in the axial direction and inclined in a direction away from each other. Is done.

The winding shaft 12 is made of a cemented carbide,
A support pin 18 is provided in a slit 20 formed in the winding shaft 12.
Is inserted, the length L of the slit 20 extending from the tip of the support pin 18 to the root side of the winding shaft 12
Is set in the range of 18 to 20 times the diameter D of the winding shaft 12.

A battery structure (sheet body) 30 wound by the winding device 10 has a band-shaped positive plate 32, a band-shaped negative plate 34, and an interposition between the positive plate 32 and the negative plate 34. And separators 36a and 36b. The positive electrode plate 32 has a positive electrode coated portion 32a and an uncoated portion 32b, and a positive electrode lead 38 is adhered to the leading uncoated portion 32b via a protective tape 40. Negative electrode plate 34
Has a negative electrode applied portion 34a and an uncoated portion 34b. The winding start ends of the separators 36a and 36b protrude forward by a predetermined length from the ends of the positive electrode plate 32 and the negative electrode plate 34.

The operation of the winding device 10 according to this embodiment having the above-described configuration will be described below.

First, as shown in FIG. 2A, the reel 12 is
The rotating cylindrical body 16 is disposed apart from the support pin 18 and moves in the direction of arrow A1 via a driving unit (not shown). The winding shaft 12 moves in the direction of the arrow A1 integrally with the rotary cylinder 16, and the inclined surfaces 22 a and 22 b provided at the distal end of the winding shaft 12 abut on the support pins 18 and are supported.
The winding start ends of the separators 36a and 36b are sandwiched between the slits 20, and the end protrudes forward by a predetermined length.

Next, the winding shaft 12 rotates in the direction of arrow B integrally with the rotating cylinder 16 via rotating means (not shown), and the positive electrode plate 32 and the negative electrode plate 34 are wound integrally with the separators 36a and 36b. You. After the battery assembly 30 is wound around the winding shaft 12 to a predetermined diameter to obtain the electrode plate group (spiral body) 42, the rotation of the winding shaft 12 is stopped (see FIG. 2B).

The winding shaft 12 is integrally formed with the rotating cylinder 16.
Moves in the direction of arrow A2, the inclined surface 2
2a and 22b are separated from the support pin 18. For this reason,
The winding shaft 12 is provided with the slit 2 by the tightening force of the electrode plate group 42.
It is elastically deformed in the direction of decreasing the width of 0, and is reduced in diameter over the length L where the slit 20 is formed. As a result, the pressure caused by the tight tightening of the electrode group 42 is released, and the winding shaft 12 can be smoothly pulled out of the electrode group 42.

At this time, in the present embodiment, the axial length L of the slit 20 in the winding shaft 12 made of cemented carbide is within the range of 18 to 20 times the diameter D of the winding shaft 12. Is set. Accordingly, the winding shaft 12 is effectively elastically displaced, and the shaft diameter of the portion where the electrode plate group 42 is laminated can be reliably reduced. The effect is obtained that the plate group 42 can be manufactured efficiently. In addition, the bending stress due to the tightening pressure of the electrode plate group 42 does not exceed the bending force of the winding shaft 12, and the breakage of the winding shaft 12 can be effectively prevented.

Next, an experiment was conducted in which the length L of the slit 20 of the winding shaft 12 was variously changed, and the shaft removal resistance, the occurrence of bamboo shoots, and the broken state of the winding shaft 12 were detected. Specifically, JIS D50 cemented carbide was used as the winding shaft 12. This cemented carbide has an elastic modulus of 40000 kgf / m
m ^{2 to} 60,000 kgf / mm ² , and static bending strength is 200 kgf / mm ^{2 to} 300 kgf / mm ^2.
Was within the range.

The diameter D of the winding shaft 12 is 3.5 mm and 4 mm
Are set, and the diameter D1 of the support pin 18 (FIG. 2A)
) Was set to 1.5 mm from the balance of strength and the like. Further, the support pins 18 are moved from the front end surface of the electrode plate group 42.
Was set to 1 mm, the outer diameter D2 of the electrode plate group 42 was set to 17.3 mm, and the height H was set to 58 mm (see FIG. 2B). The winding tension is such that the positive electrode plate 32 and the negative electrode plate 34
g, and the separators 36a and 36b weighed 350 g.

The results of an experiment using the winding shaft 12 with the diameter D set to 3.5 mm are shown in Table 1, and the results are shown in Table 1.
Table 2 shows the measurement results obtained by using the reel 12 having a value of 4 mm.

[0024]

[Table 1]

[0025]

[Table 2]

According to this experiment, when the length L of the slit 20 is set in the range of 18 to 20 times the diameter D in each of the winding shafts 12 having the diameter D set to 3.5 mm and 4 mm. The result was that no bamboo shoots were generated and the winding shaft 12 was not damaged.

[0027]

As described above, in the sheet winding apparatus according to the present invention, the winding shaft for sandwiching the strip-shaped sheet member and spirally stacking it is made of cemented carbide and supported by the pins. The length of the slit extending in the axial direction from the vicinity of the leading end of the winding shaft is set within a range of 18 to 20 times the diameter of the winding shaft. This makes it possible to manufacture a high-quality spiral body in which the winding shaft is sufficiently elastically deformed and there is no deviation in winding, and it is possible to effectively prevent the winding shaft from being damaged.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a main part of a sheet winding device according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the winding device, and FIG.
FIG. 2B is an explanatory diagram of a state in which the winding shaft is retracted, and FIG. 2B is an explanatory diagram of a state in which the electrode plate group is wound around the winding shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Winding apparatus 12 ... Winding shaft 14 ... Shaft holder 16 ... Rotating cylinder 18 ... Support pin 20 ... Slit 22a, 22b ... Sloped surface 30 ... Battery structure 32 ... Positive electrode plate 34 ... Negative electrode plate 36a, 36b ... Separator

Claims (3)

[Claims] 1. A winding shaft having a slit formed in an axial direction from a front end thereof, wherein the belt is rotatably driven while a band-shaped sheet body is sandwiched in the slit and the front end is supported by a pin. A sheet winding apparatus for manufacturing a spiral body by stacking the sheet bodies in a spiral shape and then pulling out the winding shaft, wherein the winding shaft is made of cemented carbide, and the slit is formed in the slit. When the pin is inserted, the length of the slit extending from the tip of the pin to the root of the reel is set within a range of 18 to 20 times the diameter of the reel. Sheet winding device. 2. The winding device according to claim 1, wherein the winding shaft has an elastic modulus of 40,000 kgf / mm ^{2 to} 60,000.
kgf / mm ² and static bending strength is 200k
A sheet winding device characterized in that the thickness is in the range of gf / mm ^{2 to} 300 kgf / mm ² . 3. The winding device according to claim 1, wherein the sheet body is a battery structure including a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate. A sheet winding device comprising: