JPH107295A - Winding device for band-shaped member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a band-shaped member easily after winding operation by reducing the diameter of a winding core at the time of moving the winding core in the longitudinal direction for removal of the band-shaped member after being wound from the winding core. SOLUTION: In winding an electrode element 20, the large-diameter part 208 and the small-diameter part 209 of a stopper 201 are positioned in the hole 129 of a slit winding core 120, and the outside dimensions D of the first part 121 and the second part 122 are proper winding outside dimensions. The inside diameters of the spaces SP of the first part 121 and the second part 122 are set sufficiently-larger than the largediameter part 208 of the stopper 201. When the winding core 120 is slid in the direction of X by the operation of an actuator 203 and led in to the side of a rotating plate 110, the large-diameter part 208 is fitted into a space SP between the first part 121 and the second part 122. As a result, the outside dimensions DS of the first part 121 and the second part 122 become smaller than the outside dimensions D, thus it is possible to remove the electrode element 20 easily from the winding core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device for winding a band-shaped member such as an electrode element used for a capacitor or a secondary battery.

[0002]

2. Description of the Related Art Such an electrode element is formed by laminating one or more kinds of band-shaped members. When winding the belt-shaped member, a winding device as shown in FIG. 17 is used. FIG.
The winding device 7 has a winding core 1, and the winding core 1 has a slit 2 in the longitudinal direction. The leading end of the core 1 is held by a fixture 3. As the core 1 rotates in the R direction, the belt-shaped members are sequentially wound along the outer periphery of the core 1. Since the wound belt-shaped member is used as the electrode element 4, it is necessary to remove the electrode element 4 from the winding core 1.

[0003]

However, if the band-shaped member is wound with high tension in order to increase the winding density of the band-shaped member, the core 1 is bent as shown in FIG. The core 1 cannot be easily pulled out. Therefore, at present, it is easy to remove the electrode element 4 from the core 1 by lowering the tension for winding the belt-shaped member or roughening the surface state of the core 1. However, even if such a process is performed, the electrode element 4 cannot be easily removed from the core 1 due to a difference in the coefficient of friction between the electrode element 4 and the core 1, and a large extraction force is required. . Therefore, as shown in FIG. 18, after the electrode element 4 is removed, the inner winding portion 4a protrudes or is dented from the end face, and deformation of the shape of the electrode element 4 and collapse of the end face are inevitable. This causes a failure of the electrode element 4. Therefore, an object of the present invention is to solve the above-mentioned problem and to provide a winding device that can easily remove the band-shaped member after winding with a light force.

[0004]

According to the present invention, there is provided a winding device for winding a belt-shaped member.
It has a slit so that the outer dimensions can be changed in a direction perpendicular to the longitudinal direction, and a winding core that winds the band-shaped member by rotating, and when winding the band-shaped member, with respect to the longitudinal direction of the core. Winding of a band-shaped member having a core outer dimension adjusting means for maintaining the external dimensions for winding in a direction perpendicular to the winding direction and reducing the external dimensions for removing the wound band-shaped member from the core; This is achieved by the device.

[0005] The winding core has a slit so that its outer dimensions can be varied in a direction perpendicular to the longitudinal direction. The winding core winds up the belt-like member by rotating. The winding core outer dimension adjusting means maintains the outer dimensions for winding the belt-shaped member in a direction orthogonal to the longitudinal direction of the winding core. Then, since the outer dimension adjusting means of the core removes the strip-shaped member from the core after the winding, the outer dimension of the core can be reduced. When the outer dimensions of the core are reduced, the band-shaped member after winding can be easily removed from the core with a light force.

In the present invention, when the core is moved in the longitudinal direction and the strip-shaped member after winding is removed from the core and removed, the external dimension adjusting means of the core is orthogonal to the longitudinal direction of the core. The outer dimensions for winding in the direction can be reduced. In other words, when the core is moved in the longitudinal direction and the strip-shaped member after winding from the core is to be removed, the outer dimensions of the core can be reduced. Work and the work of removing the belt-shaped member can be performed.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a winding device 10 for a belt-shaped member according to the present invention.
2 shows a preferred embodiment of the present invention. FIG. 2 is a front view of the winding device 10 of FIG. 1 and 2, a winding device 10 is also called a winder, and includes a main body 11 and a winding processing unit 1.
2. Supply parts SP1, SP2, SP3 of various belt-shaped members
SP4 etc. are provided. 1 and 2 is a winding device for winding an electrode element of a secondary battery such as a lithium ion battery as shown in FIG.

An example of a lithium ion battery will be described with reference to FIG. The lithium ion battery of FIG. 3 includes an electrode element 20, a can 22, a gasket (sealant) 24, a terminal 26, and the like made by winding up a belt-like member. The electrode element 20 is inserted into the can 22, and the gasket 24 is
2 and the terminal 26 is set further above the gasket 24. The can 22 is caulked from the outside and the terminal 26, the gasket 24
And the can 22 are integrated. Lithium-ion battery can 2
In addition, parts such as a safety valve are put in the inside of the valve. A lithium-ion battery is a non-aqueous electrolyte that uses a carbonaceous material capable of doping and undoping lithium as a negative electrode, a composite oxide of lithium and a transition metal as a positive electrode, and a non-aqueous electrolyte obtained by adding an electrolyte to a non-aqueous solvent. It is an electrolyte secondary battery. A lithium ion battery is a rechargeable battery, and replaces a conventional nickel-cadmium battery, for example, as a battery that can extend the driving time of a portable personal computer or reduce the weight if the same driving time is used.

The electrode element 20 shown in FIG. 3 is obtained by sandwiching an insulating sheet (separator) between a positive electrode and a negative electrode and winding it up in a spiral. Reactive materials (active materials) are laminated on both the positive electrode and the negative electrode. The electrode element 20 includes the strip-shaped positive electrode 30, the strip-shaped separator 32, and the strip-shaped negative electrode 3 shown in FIGS.
4. It is produced by winding the belt-shaped separator 36 in the winding processing section 12 and performing other processing. The main body 1
An electrode pancake 40 of the positive electrode 30, a pancake 42 of the separator 32, an electrode pancake 44 of the negative electrode 34, a pancake 46 of the separator 36, and the like are detachably held.
The supply section SP1 of the belt-shaped member includes a plurality of rollers 50 to 53 for forming the positive electrode 30 of the electrode pancake 40. Therefore, the positive electrode 30 is guided to the collecting roller 96 via the rollers 50 to 53.

[0011] The strip-shaped member supply section SP2 has a plurality of rollers 60 and 61 for guiding the separator 32 of the pancake 42 to the collecting roller 90. The separator 32 is guided to the collecting roller 96 via the rollers 60 and 61.
In the supply part SP3 of the belt-shaped member, the electrode plural pancakes 44
Is guided to the collecting roller 90 by the plurality of rollers 70, 71, 72. The separator 36 of the pancake 46 of the supply section SP4 of the belt-shaped member includes a plurality of rollers 80,
It is guided to the collecting roller 90 via 81. Collecting roller 9
The positive electrode 30, the separator 32, the negative electrode 34, and the separator 36, which are led to 0, are exactly stacked by the collecting roller 90. The laminated body composed of these four sheets is guided to the winding processing unit 12 side.

Next, the winding processing section 12 will be described. The winding processing unit 12 includes a rotating plate 11 as shown in FIGS.
0, 3 winding cores 120, 120, 120, opposing plate 130
It has. The cores 120, 120, 120 are arranged with a phase difference of 120 ° with respect to the rotating plate 110, and one core 120 can correspond to the winding position P <b> 1 in FIG. 2, and the next core 120 is a terminal. Located at the processing position 120,
The third core 120 can be positioned at the extraction position P3 of the electrode element 20. The rotary plate 110 indexes the rotary plate 110 every 120 ° by an index motor 140, thereby positioning the winding core 120 at each of the three positions P1 to P3 described above.

A cutting section 150 is disposed between the winding position P1 and the terminal processing position P2. The facing plate 130 is
It holds the ends of the three winding cores 120. The method of forming the electrode pancake 40, the electrode pancake 44, and the pancakes 42 and 46 in FIGS. 1 and 2 will be described with reference to FIG. In FIG. 4, for example, electrode pancakes 40 to 4
4 is made from an electrode roll 200. That is, the electrode roll 2
In the case of 00, the width L in the longitudinal direction is, for example, 800 mm or 1000 mm, and the band-like member constituting the electrode roll is formed by applying an electrode material to copper foil or aluminum foil. The electrode roll 200 is cut to a predetermined width T by a slitter process (not shown). The width T of the electrode pancake 40 or 44 cut in this manner is, for example, about 50 mm or 60 mm, and is set according to the size of the lithium ion battery. FIG.
And the pancakes 42 and 46 of the separator of FIG.

Next, the winding core 1 of the winding processing section 12 shown in FIGS.
20 and its periphery will be described. Core 120
Has a cylindrical shape as shown in FIG.
0,160. These slits 160, 1
Numeral 60 is formed at a substantially opposite position along the axial direction of the core 120. FIG. 6 shows the core 120 viewed from the arrow A in FIG. 5, and the core 120 includes a first portion 121 and a second portion 122. Slits 160 and 160 are provided between the first portion 121 and the second portion 122. FIG. 7 shows a state where the core 120 has finished winding the electrode element 20, and FIG. 8 shows a state where the electrode element has been removed from the core 120. The leading end of the core 120 has a tapered portion 123. The tapered portion 123 is adapted to be fitted into the projection 131 of the opposing plate 130 in the state shown in FIG. The core outer dimension adjusting means 200 of FIG. 7 maintains the external dimension D of the core 120 in a direction orthogonal to the X direction, which is the longitudinal direction of the core 120, when winding the belt-shaped member in FIG. In the case where the wound-up electrode element 20 is taken out as shown in FIG. 8, the outer diameter D for winding in the X direction, which is the longitudinal direction, is reduced to have an outer diameter DS. ing.

The external dimension adjusting means 200 includes a stopper 201, a stopper holding portion 202, and a core slide actuator 203. The stopper 201 and the holding portion 202 are integrally assembled as shown in FIGS. 9, 10, and 11 to 13. The holding portion 202 is a substantially cylindrical member, and has a groove 205 and a hole 210. The stopper 201 includes a support 206 and the support 2
06 is provided with the cylindrical body 207 integrated. The plate-shaped supports 206 project in the opposite direction along the diametrical direction of the cylindrical body 207. Support 206, 20
6 are fitted and fixed in the grooves 205 of the holding portion 202, respectively. The cylindrical body 207 has a large diameter portion 208 and a small diameter portion 209, and most of the small diameter portion 209 is accommodated in a central hole 210 of the holding portion 202.

The large diameter portion 208 and the small diameter portion 2 of the stopper 201
09 is a hole 129 of the winding core 120 as shown in FIGS.
Is located within. The large diameter portion 208 is the hole 1 of the core 120.
In the state positioned at 29, the outer dimensions D of the first portion 121 and the second portion 122 are appropriate outer diameters for winding the electrode element 20 around the element. Rather, the core slide actuator 203 is operated, and the core 120 slides in the X1 direction from the state of FIG. 7 and enters the rotary plate 110 and the main body 1 of FIG. 1 as shown in FIG. In the retracted state, the large-diameter portion 208 fits into the space SP between the first portion 121 and the second portion 122, so that the outer dimensions DS of the first portion 121 and the second portion 122 are as shown in FIG. It is considerably smaller than D. The first
The inner diameter of the space SP between the part 121 and the second part 122 is
The stopper 201 is set to be considerably larger than the large diameter portion 208.

The winding motor M shown in FIG.
1 and 2 by rotating in the directions shown in FIGS.
4. The separators 32 and 36 are wound so as to overlap each other, and the electrode element 20 is formed. As the winding motor M2, for example, a normal DC motor can be used, and the winding core sliding actuator 203 can employ an air cylinder, a cam mechanism, or the like. The holding section 202 is held in a hole 331 of the mounting member 330 as shown in FIG. The mounting member 330 is fixed to the rotating plate 110.

Next, an electrode element 2 for a lithium ion battery
No. 0 winding operation will be described. First, in FIGS. 1 and 2, the main body 1 has an electrode pancake 40 and an electrode pancake 4.
4. Pancakes 42, 46 are supplied to respective supply units SP1,
SP3, SP2, and SP4. The positive electrode 30, the negative electrode 34, and the separators 32 and 36 are stacked together by a collecting roller 90. Then, the laminated body 95 made of these four belt-shaped members is fitted into the slit 160 of the winding core 120 at the winding position P1 as shown in FIG.

The winding motor M shown in FIG.
When the motor 20 rotates in the direction R shown in FIG. 14, it is wound as shown in FIG. 14 by a predetermined number of rotations (turns). As shown in FIG.
0, the winding core 120 at the winding position P1 in FIG.
Is indexed clockwise of the winding core 120 by operating the motor 140. Therefore, the wound electrode element 20
Moves from the winding position P1 in FIG. 2 to the terminal processing position P2. Before moving to the terminal processing position P <b> 2, the end portion of the laminate 95 is cut by the cutter of the cutting unit 150. The terminal portion of the electrode element 20 of the core moved to the terminal processing position P2 is subjected to predetermined terminal processing such as taping so as not to be unwound.

Next, the motor 140 shown in FIG. 2 is operated, and the winding core 120 and the electrode element 20 at the terminal processing position P2 are shifted by 120 °.
It is indexed clockwise and moves to the removal position P3. At this take-out position P3, as shown in FIGS. 7 and 8, the core slide actuator 203 operates,
The core 120 slides in the X1 direction. As a result, the relative position changes between the large diameter portion 208 of the stopper 201 and the core 120, and the large diameter portion 208 is located in the space SP between the first portion 121 and the second portion 122. However, since the inner diameter of the space SP is set to be larger than the outer diameter of the large-diameter portion 122, the first portion 121 and the second portion 122 bend toward the central axis. This is because the electrode element 20 is wound with a strong tension. The reason why the electrode element 20 needs to be wound with strong tension is to increase the winding density of the laminate 95 and improve the performance of the lithium ion battery.

In any case, when the actuator 203 is actuated and the core 120 moves in the X1 direction as shown in FIGS. 7 and 8, the outer shape smaller than the outer size D of the first portion 121 and the second portion 122 is obtained. Since it changes to the dimension DS, FIG.
The electrode element 20 can be easily removed by pulling it out from the winding core 120. Therefore, when the electrode element 20 is removed from the core 120, only a small force is required, and the external dimensions of the electrode element 20 are not deformed. Therefore, the external shape and performance of the electrode element 20 can be maintained without being impaired. The deformation of the electrode element 20 and the collapse of the end face are eliminated, and the quality of the electrode element can be improved.

Another Embodiment FIGS. 15 and 16 show another embodiment of the winding device of the present invention. 15 and 16 differ from the embodiments of FIGS. 1 to 14 in the following points.
That is, the stopper 1201 of the external dimension adjusting means 200 is
This is different from the shape of the stopper 201 shown in FIGS.
The stopper 1201 includes a flat plate portion 1208, and the flat plate portion 1208 can reduce the outer size D of the first portion 121 and the second portion 122 of the core 120 to a smaller outer size. The operation and operation of the stopper 1201 are the same as those of the stopper 201 in FIGS.

As described above, according to the present invention, even if the laminate, which is a band-shaped member, is wound many times with high tension in order to improve the performance of the electrode element, the electrode element is not removed from the core. The outer dimensions of the core can be made smaller by the action of the outer dimensions adjustment means of the core, unlike during winding work, so that even a fixedly wound fixed electrode element can be easily removed from the core. Can be removed with a light load (light load).

The present invention is not limited to the embodiment. In the above-described embodiment, as the belt-shaped member, a positive electrode, a negative electrode for forming an electrode element of a lithium ion battery, and a separator therefor are exemplified, but the present invention is not limited to this. For example, the winding device of the present invention can be applied to a case where an electrode element of a secondary battery other than a lithium ion battery is formed. In addition to the battery, the winding device of the present invention can also be applied to a case where it is necessary to wind the belt-shaped member to make an electrode element when making an electronic component, for example, a capacitor. The core may be divided into four parts, for example, instead of two parts. In addition, of course, the present invention can also be applied to winding a belt-shaped member in a field other than batteries and electronic components.

[0025]

As described above, according to the present invention,
The strip-shaped member after winding can be easily removed with a light force.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a winding device for a belt-shaped member according to the present invention.

FIG. 2 is a front view of the winding device of FIG. 1;

FIG. 3 is an exploded perspective view showing an example of an electrode element obtained by winding a belt-like member and a lithium ion battery including the electrode element.

FIG. 4 is a diagram showing an example of an electrode roll and an electrode pancake for producing an electrode element of a lithium ion battery.

FIG. 5 is a perspective view showing a winding core and a peripheral portion thereof.

FIG. 6 is a view of a winding core as viewed from an arrow A in FIG. 5;

FIG. 7 is a view showing a state in which the belt-shaped member is wound by a core to form an electrode element.

FIG. 8 is a diagram showing a state in which the formed electrode element is detached from a core.

FIG. 9 is a perspective view showing an example of a holding portion and a stopper of the core outer dimension adjusting means.

FIG. 10 is an exploded perspective view showing a method of a holding unit and a stopper.

FIG. 11 is a side view showing a holding unit and a stopper.

FIG. 12 is a side view showing a partial cross section showing a holding unit and a stopper.

FIG. 13 is a front view showing a holding unit and a stopper.

FIG. 14 is a diagram showing a state where an electrode element is wound by a winding core.

FIG. 15 is a view showing another embodiment of the winding device of the present invention.

FIG. 16 is a perspective view showing another embodiment of the holding unit and the stopper in the embodiment of FIG. 15;

FIG. 17 is a view showing a conventional winding device.

FIG. 18 is a view showing an example of positions of electrode elements formed in a conventional winding device.

[Explanation of symbols]

10 ... winding device for belt-shaped member, 11 ... body, 12
... winding section, 20 ... positive electrode, 34 ... negative electrode,
32, 36 ... separator, 40, 44 ... electrode pancake, 42, 46 ... pancake, 120 ...
Core, 121: first member, 122: second member,
160: slit, 200: means for adjusting the outer dimensions of the core, 201: stopper, 202: holding part, 208: large diameter part, 203: actuator for sliding the core , 20 ... electrode element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H01M 10/40 H01M 10/40 Z

Claims (4)

[Claims] 1. A winding device for winding a band-shaped member, comprising: a slit for changing an outer dimension in a direction perpendicular to a longitudinal direction, and a winding core for winding the band-shaped member by rotating. When winding the belt-shaped member, maintain the external dimensions for winding in the direction perpendicular to the longitudinal direction of the core, and reduce the external dimensions to remove the band-shaped member from the core after winding. Winding means for a belt-shaped member, comprising: means for adjusting the outer dimensions of a winding core. 2. The external dimension adjusting means of the core is provided in a direction perpendicular to the longitudinal direction of the core when the core is moved in the longitudinal direction and the strip-shaped member is taken out from the core and removed. The winding device for a belt-shaped member according to claim 1, wherein an external dimension for winding is reduced. 3. The winding core is divided into two by a slit along the longitudinal direction, and the winding core outer dimension adjusting means has a stopper for maintaining the outer diameter of the winding core. 2. The winding device for a belt-shaped member according to claim 1, wherein when the band-shaped member is removed from the core and removed, the stopper is located inside the core when the external dimensions are reduced. 4. The winding device for a belt-shaped member according to claim 1, wherein the band-shaped member is an electrode element of an electronic component or a battery.