JPH1012265A - Manufacturing device of winding type electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate extraction and separation of a winding unit and avoid collapsing of a winding, by winding a winding type electrode sheet while pressurizing its peripheral surface to a winding core, after completion of winding, selectively reversely rotating only the winding unit. SOLUTION: A winding core 7a is drive rotated, a laminated product of a positive electrode sheet 9 and an insulating sheet 10 and a laminated product of a negative electrode sheet 8 and an insulating sheet 10' are made to run in a sliding manner, to be spirally wound onto a peripheral surface of the winding core 7a. In winding, a pair of pressure rollers 13a, 13b are brought into opposed contact with a winding surface by a fixed pressure. In the point of time completion of winding of a winding type electrode, the pressure rollers 13a, 13b are left as into opposed contact, the winding core 7a is driven to reversely rotate. Since the laminated wound winding type electrode is pressed and fixed by the pressure rollers 13a, 13b, winding back due to reverse rotation of the winding core 7a is suppressed. In a part into contact with the winding core 7a, lamination and winding are little loosened, a space part capable of extracting relating to the winding core 7a is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing apparatus capable of manufacturing a cylindrical, high-capacity wound electrode with high yield.

[0002]

2. Description of the Related Art In recent years, as electronic devices such as portable telephones and portable notebook computers have become more coatless, have higher performance, and have been made smaller and lighter, the use of secondary batteries as power sources for these electronic devices has been increasing. Capacity is required. That is, as a secondary battery serving as a power source, a nickel-hydrogen secondary battery has been put into practical use in place of a lead storage battery and a nickel cadmium battery which have been conventionally used.

A secondary battery of this type generally has a wound electrode (electromotive portion) formed by winding a laminate of a positive electrode sheet, an interlayer insulating sheet, a negative electrode sheet, and an interlayer insulating sheet. Is sealed in a liquid-tight manner in a cylindrical outer container. The wound electrode of this cylindrical battery usually holds one or two strip-shaped separators (sheets for interlayer insulation) between a pair of core rods having a semi-cylindrical shape. Then, the strip-shaped positive electrode sheet and the strip-shaped negative electrode sheet are separated along the separator, and then wound in a spiral shape by rotating the core rod. It is manufactured by creating a space between the rod and the core rod.

FIG. 2 is a plan view showing a main part of a manufacturing apparatus conventionally used for manufacturing a wound electrode. Here, 1 is a winding mechanism main body having a winding core 1a for spirally winding a strip-shaped positive electrode sheet 2, a strip-shaped negative electrode sheet 3, and a strip-shaped interlayer insulating sheet 4, 4 '. The positive electrode sheet 2, the interlayer insulating sheet 4, the negative electrode sheet 3 and the interlayer insulating sheet 4 ′ are provided on the core 1 a of the mechanism body 1.
Guides 6a and 6b are provided so as to be movable back and forth with respect to the winding core 1a of the winding mechanism main body 1 and are spirally stacked and wound on the winding core 1a. This is a pressing roller that presses the outer peripheral surface of the wound electrode formed and formed with a constant pressure to achieve dense winding.

[0005] In this configuration, the winding body 1a of the winding mechanism main body 1 is provided with a semi-cylindrical section having a flat surface facing each other so that the interlayer insulating sheet can be sandwiched therebetween.
The guide mechanism 5 includes guide blocks 5 ₁ , 5 ₂ ,
5 ₃ , 5 ₄ , and these guide blocks 5 ₁ , 5 ₂ ,
5 _3, 5 ₄ combinations, the required travel path 5a, 5b, 5c,
5d, and furthermore, guide blocks 5 ₁ ,
5 _2, 5 _3, 5 _4, by vacuum air, the interlayer insulation sheet 4, 4 'are adapted to be slidably held in the running surface.

[0006] The production of a wound electrode by this production apparatus is performed as follows. That is, the core 1a
For interlayer insulation (separator) between flat surfaces facing each other
And the negative electrode sheet 3 is supplied to the interlayer insulating sheet 4 and the positive electrode sheet 2 is supplied to the interlayer insulating sheet 4 ′ in such a manner that the negative electrode sheet 3 and the positive electrode sheet 2 are arranged along the respective layers. Is involved by rotating and driving. In other words, while each of the sheets 2, 3, 4, 4 'is spirally laminated and wound around the core 1a, the outer peripheral surface of the spiral formed is fixed at a constant pressure by the pressing rollers 6a, 6b. Pressurize with
This constitutes a wound electrode (electromotive section). Then, the core
1a is slightly rotated in the reverse direction to loosen the winding of the wound electrode around the core 1a to separate them.

[0007]

However, the conventional method for manufacturing a wound electrode has the following disadvantages. For example, as the size and capacity of nickel-metal hydride secondary batteries increase, the positive electrode sheet 2 and the negative electrode sheet 3
However, on the other hand, dense lamination and winding are required in order to store and mount in a battery outer can having a predetermined size. This dense lamination / winding makes it possible to form a wound electrode suitable for miniaturization and high capacity, but makes it difficult to separate the wound / formed wound electrode from the core 1a. I have.

That is, even if the core 1a is reversely rotated after dense lamination / winding, the lamination / winding portion close to the core 1a is unlikely to be loosened. There is a possibility that the electrodes are totally reversely rotated and the dense lamination / winding is broken. Also,
When the winding core 1a is pulled out while the loosening of the winding with respect to the winding core 1a is incomplete, the interlayer insulating sheets 4, 4 'and the electrode sheet of the lamination / winding portion close to the winding core 1a are obtained. 2,
Or 3 damage. Alternatively, the laminated / wound portion close to the core 1a may be pulled out together with the core 1a, and a required wound electrode may not be obtained. That is, it is difficult to obtain a high-capacity wound electrode with high yield and high reliability, and as a result, it is difficult to increase the capacity of the secondary battery.

Accordingly, an object of the present invention is to provide a manufacturing apparatus which can be densely wound and can produce a wound electrode (electromotive section) for increasing the capacity with a high yield.

[0010]

According to a first aspect of the present invention, there is provided a core body in which a belt-shaped positive electrode sheet, an interlayer insulating sheet, a negative electrode sheet, and an interlayer insulating sheet are stacked and spirally wound so as to be rotatable forward and backward. And a plurality of divided opposing surfaces which are arranged concentrically opposite to the winding core body and which hold the outer peripheral surface of the cylindrical electrode to be wound and have a semi-cylindrical arc or less. A cylindrical electrode holding block having a cylindrical electrode holding block, which is disposed so as to be able to advance and retreat between the cylindrical electrode holding blocks, and is pressed in a diametrical direction corresponding to the cylindrical electrode wound around the core body only in a certain direction. An apparatus for manufacturing a wound electrode, comprising: a rotating pressure roller.

According to a second aspect of the present invention, in the apparatus for manufacturing a wound electrode according to the first aspect, the cylindrical electrode holding block is configured to hold the cylindrical electrode and to be movable vertically and horizontally. It is characterized by the following.

According to a third aspect of the present invention, in the wound electrode manufacturing apparatus according to the first or second aspect, the rotation direction of the pressure roller is controlled by a one-way clutch mechanism, and the pressure roller surface is laminated. -It is characterized in that the spirally wound body is rotated by the core rotating force in contact with the outer peripheral surface of the spirally wound body.

That is, according to the present invention, while a spirally and cylindrically wound sheet for forming a wound electrode is wound around a wound core, the outer peripheral surface of the cylindrically wound body is pressed by a pressure roller to form a dense sheet. On the other hand, after the completion of the spiral winding and the cylindrical winding,
The main point is that only the core body is selectively reverse-rotated to loosen the dense winding of only the winding body adjacent to or adjacent to the core body so that the core body can be easily pulled out and separated. And

As described above, according to the present invention, after the core is wound in a cylindrical shape to form a required wound electrode, the reverse rotation of the wound electrode is prevented while the core is wound. Is rotated in the reverse direction to form a slight space between the wound electrode and the core. Therefore, the core can be easily pulled out and separated from the wound electrode. In other words, damage to the wound electrode itself or collapse of dense winding can be avoided, and a required high-capacity, high-quality wound electrode can be manufactured with high yield.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIG.

FIG. 1 is a plan view showing a main configuration of a device for manufacturing a wound electrode in this embodiment. FIG.
In Fig. 7, a driving member 7 rotates in the direction of arrow A to spirally wind the strip-shaped negative electrode sheet 8, positive electrode sheet 9, and interlayer insulating sheets (separates) 10, 10 ', while performing reverse rotation in the direction of arrow B. This is a winding mechanism main body having a core (core rod) 7a with a mechanism (not shown). Here, the core 7a
Is to be able to sandwich the interlayer insulating sheet,
It has a configuration including a semicircular section in cross section that forms a flat surface section facing the same. Reference numeral 11 denotes a guide mechanism for supplying the negative electrode sheet 8, the interlayer insulating sheet 10, the positive electrode sheet 9, and the interlayer insulating sheet 10 'to the core 7a of the winding mechanism body 7.

Further, reference numerals 12a and 12b are arranged concentrically and opposite to the core 7a, and the opposite surface holding the outer peripheral surface of the wound cylindrical electrode has an arc of a half cylinder or less. It is a pair of cylindrical electric holding blocks. here,
The cylindrical electrode holding blocks 12a and 12b sandwich and hold the cylindrical electrodes wound around the core 7a, and spirally wind the electrode forming sheets 8, 9, 10, and 10 '. In the mounting process, the core electrode 7a is separated from the core 7a and stands by, and functions to approach the outer peripheral surface of the cylindrical electrode and hold it in a sandwiched manner after the winding is completed.

The cylindrical electrode holding blocks 12a, 12b
Is to enhance the holding function sandwiching the cylindrical electrode,
With the cylindrical electrode sandwiched and held, it may be installed so as to be movable (or drivable) in a vertical or horizontal direction by a driving mechanism. That is, the cylindrical electrode pulled out of the core 7a is sandwiched and held, and is moved upward to move the core 7a.
After being pulled out and separated from it, when it is moved to a predetermined position by moving in the horizontal direction etc., it is automatically released if it is configured to release the holding of the cylindrical electrode and return to the original state / position. Work can proceed.

Also, 13a and 13b are arranged between the cylindrical electrode holding blocks 12a and 12b so as to be able to advance and retreat, and
A pair of pressure rollers 15a and 15b are diametrically pressed by, for example, air cylinders 14a and 14b corresponding to the cylindrical electrodes wound and formed on 7a.
This is a one-way clutch mechanism built in 3b. Here, the pressure rollers 13a and 13b rotate only in one direction (directions of arrows C and D) corresponding to the rotation of the core 7a.
The outer peripheral surface of the cylindrical electrode being wound and formed on the substrate is pressurized at a constant pressure to achieve dense winding and formation.
Therefore, the pressure rollers 13a and 13b are provided so as to be able to advance and retreat (move) in the diameter direction of the core 7a in accordance with the winding and forming of the cylindrical electrode. The pressure roller 1
The pressurization by 3a, 13b is performed by the electrode forming sheets 8, 9, 10,
It is appropriately selected and adjusted depending on the material, thickness, capacity and dimensions of the cylindrical electrode, and the like.

Next, a description will be given of an example of manufacturing a wound electrode by a manufacturing apparatus whose main part is shown in FIG.

First, between the separated and opposed flat portions of the core 7a,
In order to function as the interlayer insulating sheets 10 and 10 ', a tape-shaped insulating sheet having both ends wound around a rewind roller (not shown) is inserted or sandwiched. Here, the insulating sheet is in the form of a tape having a thickness of, for example, 0.2 mm and a width of 63 mm. A tape-shaped positive electrode sheet 9 having a thickness of, for example, 0.6 mm and a width of 60 mm is provided along one side. Sa
A tape-shaped negative electrode sheet 8 of 0.3 mm and a width of 60 mm is arranged along.

Next, the core 7a is driven and rotated in the direction of arrow A, and the guide mechanism 11 rotates the laminate of the positive electrode sheet 9 and the insulating sheet 10 and the negative electrode sheet 8 and the insulating sheet.
Each of the 10 ′ laminates is slidably moved to form a core
It is spirally wound on the outer peripheral surface of 7a. During the spiral winding, the pair of pressure rollers 13a and 13b
While rotating in the direction D and the direction D, respectively, the spiraling / winding is advanced while being in contact with the spiral / winding surface at a constant pressure. In other words, by performing the spiraling / winding while applying a constant pressure to the spiraling / winding surface, a dense spiral / winding without loosening is performed. Positive electrode sheet 9 and insulating sheet
At the end of the spiral winding of the laminate of 10 and the laminate of the negative electrode sheet 8 and the insulating sheet 10 ', in other words,
In the final stage of manufacturing and forming the wound electrode corresponding to the battery capacity, after the winding of the positive electrode sheet 9 is completed, the wound end of the positive electrode sheet 9 is passed (covered) and the negative electrode sheet is covered. 8
Then, a laminate of the insulating sheet 10 ′ is wound, and finally, a cylindrical electrode whose outer peripheral surface is constituted by the negative electrode sheet 8 is formed.

At the end of the production of the wound electrode, the winding core 7a is driven and rotated in the direction of arrow B with the pressure rollers 13a and 13b kept in contact with the outer peripheral surface of the spiral winding. At this time, the wound-type electrode formed by lamination and winding is unwound by the reverse rotation of the winding core 7a in the direction of arrow B since the outer peripheral surface thereof is pressed and fixed by the pressing rollers 13a and 13b. Is also deterred. In other words, only in the portion adjacent to or close to the core 7a, the partial lamination / winding is slightly loosened by the reverse rotation of the core 7a, and the core 7a
A space that can be pulled out is generated.

In this state, the cylindrical electrode holding block 12
a and 12b are driven by a drive mechanism (not shown) to pinch and hold the outer peripheral surface of the cylindrical electrode (rolled electrode),
It moves upward and is pulled out and separated from the core 7a. Furthermore, if necessary, when the rod is moved to a predetermined position, such as in a horizontal direction, the work can be automatically performed by releasing the holding of the cylindrical electrode and returning it to its original state and position. It is.

As described above, while the outer peripheral surface on which the dense winding is performed is pressed and suppressed with a required pressure, the winding core 7a and the wound electrode are rotated by the reverse rotation of the winding core 7a. Is performed, so that phenomena such as separation of the two, damage to the wound electrode and collapse of the dense winding due to pulling out of the core 7a are eliminated. Further, to be referred to, a high capacity, small-sized, high-quality cylindrical electrode (rolled electrode) can be easily provided with a good yield, and a highly reliable high capacity secondary battery can be provided.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, insulation sheet, positive electrode sheet,
The thickness and width of the negative electrode sheet can be appropriately set according to the type and capacity of the target secondary battery.

[0027]

According to the first aspect of the present invention, after the winding of the tape-shaped positive electrode sheet, the tape-shaped negative electrode sheet and the interlayer insulating sheet (separator), the outer peripheral surface of the wound body is pressed with an appropriate pressure. The winding of the winding start part (the part adjacent to the winding core) of the winding body can be selectively loosened while avoiding or suppressing the occurrence of loosening. In other words, it is possible to avoid or suppress the occurrence of loosening of the entire wound body, and to form a loosened space or a space only in a certain area where the hollow core can be pulled out and separated. Therefore, it is possible to obtain a cylindrical wound electrode that is densely wound and has a small outer diameter and can easily achieve high capacity with a high yield, and as a result, it is greatly useful to provide a highly reliable secondary battery. Contribute.

According to the second and third aspects of the present invention,
It is possible to more efficiently provide a cylindrical wound electrode that is densely wound, has a small outer diameter, and can easily achieve high capacity.

[Brief description of the drawings]

FIG. 1 is a plan view showing a structural example of a main part of an apparatus for manufacturing a wound electrode according to the present invention.

FIG. 2 is a plan view showing a main structure of a conventional wound electrode manufacturing apparatus.

[Explanation of symbols]

 1, 7 ... winding mechanism body 1a, 7a ... winding core 2, 9 ... strip-shaped positive electrode sheet 3, 8 ... strip-shaped negative electrode sheet 4, 4 ', 10, 10' ... interlayer insulating sheet 5, 11 guide mechanism 6a, 6b, 13a, 13b pressure roller 12a, 12b cylindrical electrode holding block 14a, 14b air cylinder 15a, 15b one-way clutch mechanism

Claims (3)

[Claims] 1. A belt-shaped positive electrode sheet, an interlayer insulating sheet,
A winding mechanism body having a forward / reverse rotatable winding core for laminating and spirally winding a negative electrode sheet and an interlayer insulating sheet; and a concentrically disposed winding body disposed opposite to the winding core. A plurality of opposing surfaces that hold the outer peripheral surface of the cylindrical electrode are cylindrical electric holding blocks having an arc of a half cylinder or less, and are disposed so as to be able to advance and retreat between the cylindrical electrode holding blocks,
And a pressure roller that rotates in a fixed direction while pressing in a diametrical direction corresponding to the cylindrical electrode wound around the core. 2. The wound electrode manufacturing apparatus according to claim 1, wherein the cylindrical electrode holding block is configured to hold the cylindrical electrode and to be movable vertically and horizontally. 3. The rotation direction of the pressure roller is controlled by a one-way clutch mechanism, and the pressure roller surface is brought into contact with the outer peripheral surface of the laminated spirally wound body to rotate by the core rotating force. The apparatus for manufacturing a wound electrode according to claim 1 or 2, wherein: