JP4605779B2 - Reel - Google Patents

Description

  The present invention relates to a winding shaft for producing a wound body in which a strip is wound, and more particularly to a winding shaft suitable for producing a wound body for a secondary battery or an electric double layer capacitor.

  Secondary batteries, which are obtained by impregnating a wound body obtained by winding a belt-like body having a positive electrode or negative electrode electrode active material through a separator with an electrolyte, are widely used in lithium ion secondary batteries and the like. After winding the positive electrode, the negative electrode, and the separator densely, it is necessary to prevent deformation or large distortion of the wound body when the core portion is extracted.

  For example, there is a technique disclosed in Patent Document 1. It is formed so that it can be fitted into a winding shaft main body composed of two flat plates that divide the width direction into two, and one end portion in the longitudinal direction of the winding shaft main body to a receiving portion that supports the winding shaft main body. The other side in the longitudinal direction of the main body is connected to the rotation shaft, the winding shaft main body is formed to be separable from the receiving portion, and a gap forming member provided in the receiving portion enters between the two flat plates of the winding shaft main body. This is a flat type winding shaft configured such that a gap is formed between the flat plates in a state in which the winding shaft main body is fitted. Accordingly, when the reel body is separated from the receiving part, the spring is formed so that the width on the receiving part side of the reel body is narrowed by the spring. Becomes easier.

JP 2000-255847 A

  In the prior art, for example, in the case of Patent Document 1, one end portion in the longitudinal direction of the winding shaft body is formed to be able to fit into a receiving portion that supports the winding shaft body, and the other side in the longitudinal direction of the winding shaft body is It is connected to the rotating shaft, and has a structure that supports the winding shaft body from both sides during winding. As a result, in order to pull out the wound body after winding, a process of first separating the receiving portion is required, which has been a cause of hindering the reduction of the winding man-hour.

  In this situation, an object of the present invention is to provide a winding shaft having a simple structure and capable of reducing the man-hour of the entire winding process.

In order to solve the above-described problems, the winding shaft of the present invention has two rectangular plates arranged so that the main surface is parallel to the rotation axis and the rotation axis is sandwiched, for winding the belt-like body. In the winding shaft having first and second blade bodies each having one or the other of the blades, and a rotation holder for holding the blade body and rotating it around the rotation axis, the first blade body Is a fixed blade body whose root is fixed inside the rotary holder, and the second blade body is a movable blade body that can be set to move in one radial direction of the rotation axis, and the winding of the belt-like body sometimes configured to rotate about said movable blade member is fixed to the rotating holder at the root portion the rotation axis, the root portion of the movable blade body yield to the rotating holder inside the rectangular cavity A wedge-shaped inclined surface is formed in the root portion, and a wedge-shaped member that slides in contact with the inclined surface is disposed in the cavity, and the wedge-shaped member is operable from the outside of the rotary holder. The movable blade body can be moved in the radial direction of the rotation axis by having a connecting portion and operating the wedge-shaped member to move along a linear direction parallel to the rotation axis. And

  It is preferable that a suction hole is formed in at least one of the fixed blade body and the movable blade body for winding, and an air circuit connected to the hole is provided.

  In the present invention, from the state in which two rectangular plate-like blades having a longitudinal direction in the direction of the rotation axis are superposed, one blade is rotated by a certain amount while keeping the principal surfaces of each other in parallel. The strip is wound in a state shifted in one radial direction of the axial center, and then the rotational axis is moved in the radial direction so as to reduce the shifted amount. The frictional force between the inner side of the blade and the outer side of the two blades is reduced, so that it can be easily extracted. Moreover, since this invention rotates a braid | blade with a cantilever support structure, the man-hour for extraction can be reduced. Furthermore, since the support part of the cantilever support structure is provided with means for moving the rotational axis in one radial direction using a wedge shape, the overall structure is simplified.

  That is, according to the present invention, it is possible to provide a winding shaft that has a simple structure and can reduce the total man-hour for winding.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a winding shaft in a blade state at the time of winding in an embodiment of the present invention, and FIG. 1 (a) is a cross-sectional view taken along line AA indicated in FIG. 1 (b), viewed from above. FIG. 1 and FIG. 1B are cross-sectional views taken along the line BB indicated in FIG. 1A, viewed from the front, and FIG. 1C is a left side view.

  FIG. 3 is a perspective view showing the winding shaft of the present embodiment, 12 is a fixed blade body having a rectangular plate blade, 13 has a rectangular plate blade, and is movable in one radial direction of the winding shaft center. A movable blade body that can be set, 11 is a fixed blade body and a rotary holder that rotates by holding the movable blade body in a cantilevered support structure, 14 is a cap that covers the end face of the rotary holder, and 19 is a rectangular opening provided in the cap. , 20 is a screw for fixing the cap 14 to the rotary holder 11, and 18 is a knob for determining a radial position of the movable blade body.

  As shown in FIG. 3, the winding shaft of the present embodiment has a fixed blade body 12 and a movable blade body 13 that are supported by a cantilever support structure by a rotating holder 11 that rotates around a central axis (winding axis). Then, a belt-like positive electrode, negative electrode, and separator that are battery elements of the secondary battery are wound on the blade surface. Next, the blade of the movable blade body 13 is shifted in the radial direction of the winding axis to increase the overlapping portion with the blade of the fixed blade body 12 to reduce the frictional force with the inner peripheral surface of the wound body. Pull out the blade in the state. And it moves to the next winding process.

  Based on FIG. 1, the movement of the winding blade in the radial direction of the winding axis will be described. As shown in FIG. 1B, the fixed blade body 12 and the movable blade body 13 are stacked one on top of the other, and as shown in FIG. 1A and FIG. It's off.

  A mechanism for holding the position of the movable blade body 13 in this way will be described with reference to FIG. FIG. 4 is a perspective view showing a movable blade body and a wedge-shaped member. An inclined surface is formed at the base portion of the movable blade body 13 and a spring hole 46 is provided on the opposite side thereof. It is arrange | positioned between inner surfaces. A vacuum suction hole 21 is provided on the winding surface of the movable blade body 13. The base portion of the movable blade body 13 and most of the wedge-shaped member 15 that slides on the inclined surface thereof are accommodated in a rectangular parallelepiped cavity inside the rotary holder, and a part of the knob 18 goes out of the rotary holder.

  On the other hand, the fixed blade body 12 is fixed to the rotary holder 11 with screws 20 as shown in FIG.

  As shown in FIG. 1A, the wedge-shaped member 15 is movable along one plane parallel to the winding axis (the wall surface in the rectangular parallelepiped cavity), and the operation of the knob 18 connected thereto and the spring 17 It is possible to move by the action of. In addition, an inclined surface is provided at the base portion of the movable blade body 13, and the inclined surface is pushed up by the spring 16 and slides so that the inclined surface is in contact with the inclined surface of the wedge-shaped member 15. As a result, the movable blade body 13 can be moved in the radial direction (vertical direction in the drawing) of the winding axis by operating the knob 18, and the position of the knob 18 is locked to lock the winding axis of the movable blade body 13. Is positioned in the radial direction and is cantilevered by the rotary holder 11.

  A vacuum suction hole 21 is provided on the winding surface of the movable blade body 13, and a vacuum suction hole is also provided on the winding surface of the fixed blade body 12, which is connected to an air circuit (vacuum system device). The end of the belt-like body to be wound is sucked by this vacuum suction hole, and the rotary holder 11 is rotated around the winding axis to wind up the belt-like body.

  2 shows a blade state when the wound body is pulled out, FIG. 2 (a) is a plan sectional view corresponding to FIG. 1 (a), and FIG. 2 (b) is a left side view. As shown in the figure, when the winding body is extracted, the knob 18 is operated to move the wedge-shaped member 15 in a linear direction parallel to the winding axis, thereby moving the wedge-shaped member 15 in contact with the inclined surface. The base portion of the blade body 13 slides so as to be pushed up by the spring 16. As a result, the blade (winding portion) of the movable blade body 13 moves so that the overlapping portion with the blade of the fixed blade body 12 decreases, and the frictional force at the time of extraction decreases.

  When the winding shaft of the present embodiment was used in the manufacturing process of the lithium ion secondary battery, the dimensions of the jelly roll before winding ranged from width (10 to 45) mm × length (180 to 500) mm. Good winding can be performed, and then, when the winding body is pulled out, the inside of the winding body is not pulled out while adhering to the blade, and damage or large distortion does not remain inside the winding body. We were able to proceed to the process. Furthermore, by using the winding shaft of the present embodiment, the number of man-hours for the entire winding process can be reduced as compared with the type that supports the winding blade from both sides.

  In the above embodiment, the case of the positive electrode, the negative electrode, and the separator of the lithium ion secondary battery has been described as the band to be wound. However, the winding shaft of the present invention is also used to manufacture a wound body for an electric double layer capacitor. In general, it can be used for a process of extracting a core from a wound and wound strip.

FIG. 1A shows a winding state of a blade state at the time of winding in an embodiment of the present invention, FIG. 1A is a cross-sectional view taken along the line AA in FIG. 1B, and FIG. BB sectional drawing instruct | indicated in a), FIG.1 (c) is a left view. The blade state when extracting the wound body in one embodiment of the present invention is shown, FIG. 2 (a) is a plan sectional view, FIG. 2 (b) is a left side view. The perspective view which shows the winding shaft in one embodiment of this invention. The perspective view which shows the movable blade body and wedge-shaped member in one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Rotating holder 12 Fixed blade body 13 Movable blade body 14 Cap 15 Wedge-shaped members 16, 17 Spring 18 Knob 19 Rectangular opening 20 Screw 21 Vacuum suction hole 46 Spring hole

Claims (2)

1st and 2nd provided with one or the other of two rectangular plate blades disposed so as to have a main surface parallel to the rotation axis and sandwiching the rotation axis for winding the belt-like body In a winding shaft having a blade body and a rotary holder for holding the blade body and rotating around the rotation axis, the first blade body is a fixed blade whose root is fixed inside the rotary holder And the second blade body is a movable blade body that can be set so as to be movable in one radial direction of the rotational axis, and is fixed to the rotary holder at the root portion of the movable blade body when the belt-like body is wound. is configured to rotate around said rotation axis is, the root portion of the movable blade body contained within rectangular cavity inside the rotating holder, wedge-shaped inclined surface in the root portion A wedge-shaped member that is formed and slides in contact with the inclined surface is disposed in the cavity, and the wedge-shaped member has a connecting portion that can be operated from the outside of the rotary holder, and the wedge-shaped member is connected to the rotating shaft. A winding shaft characterized in that the movable blade body can be moved in a radial direction of a rotation axis by operating to move along a linear direction parallel to the center. The winding shaft according to claim 1 , wherein a suction hole is formed in a winding portion of at least one of the fixed blade body and the movable blade body, and an air circuit connected to the hole is provided.

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