JP2902983B2 - Winding shaft of flat type winding element winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding device for manufacturing a flat winding type element such as a battery element or a capacitor element, and more particularly to a winding shaft in such a winding apparatus.

[0002]

2. Description of the Related Art A wound element such as a battery element or a capacitor element is obtained by stacking and winding a plurality of films such as a positive / negative electrode and a separator film or two dielectric films to form a cylindrical or elliptical cylinder. This is a device having a shape of a circle. Among these, the elliptical cylindrical element, that is, the flat-shaped element, may be formed by crushing the cylindrical element,
In many cases, a flat shaft is used as a winding shaft and the shaft is wound into a flat shape.

[0003] To explain this for a battery element, for example, as shown in Fig. 5, a positive electrode 21, a separator film 22, a negative electrode 23, and a separator film 24 are sent out from respective supply rollers 21r, 22r, 23r, 24r and taken up. After being superimposed before the shaft 25 and the leading end portion is sandwiched between the slits 26 of the winding shaft, the winding shaft is rotated and wound to form a flat wound element. Actually, two winding shafts are paired, and when winding on one winding shaft is completed, the winding shaft moves downward to cut the end of the film, and at the same time the other winding shaft. The shaft is rotated upward and a new winding is performed by the winding shaft.

At the beginning and end of the winding, the positive and negative electrodes are not present to avoid a short circuit, and the winding is performed by only two separators. This is shown in FIG. In this figure, the left side of the drawing is a winding start portion, and the right side is a winding end portion. A positive electrode lead tab 27 is provided on the positive electrode 21 at the winding start portion, and a negative electrode lead tab 28 is provided on the negative electrode 23 at the winding end portion. . The shape of the wound element is as shown in FIG. 7 or FIG. In these figures, 2
Reference numeral 9 denotes a winding end portion, and reference numeral 30 denotes a tape for sealing the winding end portion.

FIGS. 9 and 10 are sectional views of a conventional winding shaft device. The winding shaft 31 is provided in a cylindrical winding shaft collar 32 so as to be movable in the direction of the arrow. The leading end 25 of the winding shaft 31 has a slit 26 for sandwiching the leading end of the film. After inserting the leading end of the film into this slit, the winding is performed by rotating the winding shaft 31. When the winding is completed, the winding shaft 31 is pulled out in the direction of the arrow. On the other hand, the winding-type element e having completed the winding is stopped by the winding shaft collar 32 at that position.
Break away from FIG. 9 shows a structure in which the winding shaft 31 is integrated and a slit is formed at the tip, and FIG.
1 is a two-body type that is divided into two parts in the middle. The cross-sectional shape of the winding shaft is a rhombus, a plate, an ellipse, or the like. FIG.
Is an example of a cross-sectional shape of a conventional winding shaft.

[0006]

However, the above-mentioned conventional winding shaft has the following problems. As described above, the structure of the wound type element has no electrode at the beginning of winding to prevent short-circuiting, and has only a separator film. Since the thickness of the separator film is extremely thin compared to the electrode, when the winding shaft is pulled out after finishing, the separator film at the beginning of winding, that is, the innermost peripheral part of the element is drawn into the collar side together with the winding shaft, A drawback of being pulled out of the element occurs. In the worst case, an accident occurs in which the winding shaft does not come off.

The present invention has been made in view of the above-mentioned problems. In winding a flat-shaped winding element, as described above, the film on the inner peripheral portion of the element is pulled out together with the winding shaft, and is taken out of the element. To prevent troubles such as being pulled out or the winding shaft not being able to be pulled out of the winding element, and aiming to efficiently manufacture a high-quality winding element, and to achieve such an object. The purpose is to provide.

[0008]

The present invention has solved the above-mentioned problem by dividing a winding shaft, which has conventionally been an integral type or a two-piece type with a slit interposed, into a central portion and both wing portions.

[0009] The present invention is flat, wherein the central <br/> member having a slit, a Rukoto such from the two <br/> wing member you are contacting each side of said central member Shape-wound element
The present invention relates to a winding shaft of a winding device . In addition, that of two wing members
Each part is in contact with the central member above the central member.
Desirably, the ends and lower ends are not reached. like this
The shape of the center member, wing member and film
(See Fig. 1)
Operation becomes easy.

In the case of a conventional flat wound element, stress is concentrated on an acute angle portion of the element when pulling out the winding shaft (both ends of the long diameter in FIG. 11). As a result, the innermost peripheral portion of the element was pulled out together with the winding shaft. The winding shaft of the present invention, since it is divided into a central member and the wings member is pulled out only the central member of the first. Since there is no sharp portion of stress concentration in the central member <br/>, it can be pulled out of this easily from elements, thus never become grabs innermost peripheral portion of the device together. Next wing
Pull out the material . This is when the central member is already withdrawn, the film slack is given to, so thereby stress of sharp edges is eliminated, it is possible to pull out easily the remaining wing member. Therefore, the inner peripheral portion of the wound element is not removed from the element as in the related art.

[0011]

FIG. 1 shows an embodiment of a winding shaft for a winding type element according to the present invention, and is a cross-sectional view of the winding shaft. In this figure, the cross-section of the central member (1) having a slit 4 is circular, blade member (2) is in contact with both sides of the central member (1).
This take-up shaft in the film f is wound, the central member (1), the wing <br/> member 2, it is the space 3 surrounded by the tripartite film f. In this figure, the circle of the central member (1) has a diameter of 8 mm, from one end of the blade 2 to the end of the other wing 2, i.e. the longest part of the winding shaft is 24 mm, the maximum width of the blade member is 5mm
It is. Central member 1 may be of integral type in which slits are formed only on the tip of the winding shaft may be a two-piece became two-body the boundary of the slit.

In the present invention, such a take-up shaft is installed in the take-up device shown in FIG. 9 or FIG. 10 to take up the element. Withdrawal of the winding shaft after winding is finished, first carried out from the central member is withdrawn in the direction of the arrow shown in FIG. 9 or 10. Central member is weak stress because the film is not wound at an acute angle, it can be withdrawn easily. When pulled out central member, it can be withdrawn without difficulty wing member since it is slack in the film. The winding element is separated from the winding shaft by being blocked by the winding shaft collar. In order to perform withdrawal from the winding shaft more smoothly, the central member of the winding shaft collar, just slits may be provided a metal wire or metal plate portion to pass.

[0013] The central member in the above embodiment, although cross-section is circular, other example 2, may be mentioned the cross-sectional shape as shown in FIG. 3 or FIG. 4. Such a cross-sectional shape
Therefore, the three members of the center member, the wing member and the film
There is a space between them, making it easy to pull out the members.
You .

[0014]

According to the winding shaft of the present invention, the wound flat type element can be easily separated from the winding shaft, so that the inner peripheral portion of the element does not protrude from the element as in the prior art. Good products cannot be produced, and the winding operation can be performed smoothly and efficiently.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a winding shaft according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the winding shaft of the present invention.

FIG. 3 is a sectional view showing another embodiment of the winding shaft of the present invention.

FIG. 4 is a sectional view showing another embodiment of the winding shaft of the present invention.

FIG. 5 is a diagram illustrating a winding method of a wound battery element.

FIG. 6 is a diagram illustrating a winding start portion and a winding end portion of winding of a wound type battery element.

FIG. 7 is a diagram showing the appearance of a wound element.

FIG. 8 is a diagram showing an appearance of a wound element.

FIG. 9 is a sectional view showing a conventional integral winding shaft.

FIG. 10 is a sectional view showing a conventional two-piece winding shaft.

FIG. 11 is a diagram showing a cross-sectional shape of a conventional winding shaft.

[Explanation of symbols]

1 ... center member, 2 ... blade member, 3 ... space, 4 ... slit,
f ... film.

Claims (3)

(57) [Claims] 1. A a central member having a slit, the central portion
Take-up shaft of the flat-shaped wound-type element winding apparatus according to claim Rukoto such from the two wing member you are contacting each side of wood. 2. The part of each wing member that is in contact with the center member is
The winding shaft of the flat-type winding element winding device according to claim 1 , wherein the winding shaft does not reach the upper end and the lower end of the central member . 3. The cross-section of the central member is a circle.
The winding shaft of the flat-shaped winding type element winding device.