JP3336642B2 - Apparatus and method for manufacturing spiral structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a spiral electrode structure suitable for manufacturing, for example, a lithium ion secondary battery.

[0002]

2. Description of the Related Art In recent years, with the advancement of electronic technology, electronic devices have become more sophisticated, smaller, and more portable, and high energy density secondary batteries for use in these electronic devices have been developed. .

In particular, non-aqueous electrolyte type lithium ion secondary batteries capable of achieving higher discharge voltage and higher energy density than conventional nickel-cadmium batteries and lead batteries have been actively developed.

Such a lithium ion secondary battery uses a material capable of doping and undoping lithium ions such as lithium, a lithium alloy or a carbon material as a negative electrode, and uses a lithium composite material such as a lithium cobalt composite oxide as a positive electrode. An oxide is used. And the electrode structure is a spiral electrode structure to increase the electrode area and enable heavy load discharge, and as a separator to fill more electrode active material and promote high capacity. Microporous polymer films have been used.

Here, a method for manufacturing a spiral electrode structure of a lithium ion secondary battery will be described with reference to FIGS.

A lithium ion secondary battery is a paper-lined type (PL system), that is, a polymer separator that separates a positive electrode and a negative electrode material (passes ions but electrically blocks) between a positive electrode and a negative electrode. It is wound between the positive electrode and the negative electrode, and is spirally rolled and placed in a can. A winding machine (usually called a winder) is in charge of this winding process.

FIG. 3 is an overall view (A) of a core used in a conventional apparatus for manufacturing a spiral-type structure, a cross-sectional view near a center of the core (B), and a detailed view of a tip of the core ( C). Here, reference numeral 2 denotes a split pin, which is used for stacking and winding the separator, the positive electrode, and the negative electrode. The outer shape of the split pin 2 is substantially cylindrical. Reference numeral 3 denotes a split groove, which is a slit parallel to the center axis of the core from the tip of the split pin 2 to about 2/3 of the total length of the split pin, and is used to start winding with a separator interposed therebetween. Things. An inclined portion is provided at the leading end of the core to facilitate installation of the separator. A cylindrical hole having the same center axis as the center axis of the winding core 1 is provided at the distal end portion to secure the spindle support pin 4 securely.

The winding step will be described. First, as shown in FIG. 4A, the core 1 moves forward where the two separators 7 are positioned in parallel, and sandwiches the separation 7. Next, as shown in FIG. 4B, a predetermined amount of the separator 7 is wound up. Next, as shown in FIG. 4C, the anode 9 and the cathode 8 are supplied simultaneously. Next, as shown in FIG. 5A, a predetermined amount of the anode 9, the cathode 8, and the separator 7 are wound. Next, as shown in FIG. 5B, the separator 7 is cut, and the end of the separator is fixed with the wrapping tape 10.

[0009] The step of removing the core after winding will be described. First, it starts from the above-mentioned stage of finishing winding (see FIG. 6A).

As a first step, the core 1 starts to retreat, the element end hits the guide holder 11, and the core 1 starts to come off from the element 5. The inclined portion at the tip of the core 1 is disengaged from the spindle support pin 4, and the core 1 is bent from the tip side by the winding tension, and a gap is created between the inner diameter of the element and the core 1 (FIG. 6).
B).

Next, as a second step, the core 1
Retreats. Since the split groove 3 of the bent core 1 does not contact the separator 7 inserted first, the core 1 comes off (see FIG. 7A).

Next, as a third step, the retraction of the core 1 is completed, and the core 1 is removed cleanly from the element 5 (see FIG. 7B). Through the above steps, a spiral electrode structure is manufactured.

[0013]

However, when the above-described apparatus for manufacturing a spiral structure is used, after the element is wound, the separator is sandwiched between the split grooves, and wrinkles are generated in the separator inside the split groove, so that the separator cannot be removed. Disappears. That is, the element may have a bamboo-like shape, resulting in a defective product.

Further, since the wound element is tightly wound inside, there is a problem in that the wound element is in close contact with the outer diameter of the core and cannot be removed.

The present invention has been made in view of such a problem, and does not propose an apparatus and a method for manufacturing a spiral-type structure capable of easily removing an element after winding from a core. It is assumed that.

[0016]

Apparatus for manufacturing a battery spiral structure of the present invention According to an aspect of, for example, as shown in FIG. 1, separator strip to split groove 3 of the split pin 2 for winding which is rotated
And begin winding, sandwiching the positive and negative strips.
Do not interpose the above separator so that they do not contact each other.
In a manufacturing apparatus for a battery spiral structure, which is manufactured by pulling apart the split pins 2 after laminating in a spiral shape,
The split groove 3 of the split pin 2 has a tapered portion 3a in which the gap of the split groove 3 becomes wider toward the tip. Further, the apparatus for manufacturing a spiral structure for a battery electrode of the present invention
Is in the form of a band in the groove of the take-up split pin
Sandwiching the sheet material and starting to wind, it was laminated in a spiral type
Later, spiral type for battery electrode manufactured by detaching split pin
In the structure manufacturing equipment, the split groove of the split pin is
It has a tapered part where the gap of the split groove becomes wider toward the tip
It is.

[0017] A method for manufacturing a battery electrode spiral structure of the present invention, for example as shown in FIG. 2, the above-described configuration battery
The winding split pin 2 is driven to rotate in the winding direction by using the manufacturing apparatus of the electrode spiral structure, and the strip-shaped sheet material is wound, and then the winding split pin 2 is wound. In this method, the split pin 2 is pulled out by reverse rotation in the range of 1/8 rotation to 1/2 rotation in the direction opposite to the direction.

Further, the method for manufacturing a spiral structure according to the present invention is characterized in that the separator is inserted into the split groove 3 of the winding split pin 2 so as to start winding, and further, the strip-shaped positive electrode and the strip-shaped negative electrode do not come into contact with each other. This is a method of the above-described configuration in which a spiral electrode structure for a battery is manufactured by winding the battery with the separator interposed therebetween.

[0019]

According to the manufacturing apparatus for a battery cochleate structure the present invention, the winding start sandwich the strip-shaped separator split groove 3 of the split pin 2 for winding which is driven to rotate, further band-like positive
The above separator so that the electrode and the negative electrode do not contact each other
In a manufacturing apparatus for a battery spiral type structure which is manufactured by pulling apart the split pins 2 after stacking them in a spiral shape while interposing the slits, the split grooves 3 of the split pins 2 Has a tapered portion 3a that becomes wider toward the tip end, or for the battery electrode of the present invention.
According to the apparatus for manufacturing a spiral structure, a winding driven by rotation
The strip-shaped sheet material in the split groove of the split pin
Start winding and after stacking in a spiral type, pull out the split pin and separate
Of a spiral-shaped structure for battery electrodes manufactured by
The split groove of the split pin
By having a tapered portion that becomes wider , the separator and the core split groove portion are close to the surface contact at the time of extraction, so that the separator does not wrinkle and can be easily extracted.

Further, according to the method for manufacturing a spiral structure for a battery electrode of the present invention, the split pin 2 for winding is wound in the winding direction using the manufacturing apparatus for a spiral structure for a battery electrode configured as described above. After winding the belt-shaped sheet material by rotation, the winding split pin 2 is driven in the reverse direction in the direction opposite to the winding direction in the range of 1/8 rotation to 1/2 rotation to split. By removing the pin 2, in addition to the above-described effects, the close contact between the core and the separator is reduced, so that the element can be easily removed from the core after winding.

Further, according to the method of manufacturing a spiral structure according to the present invention, the separator is inserted into the split groove 3 of the winding split pin 2 to start winding, and furthermore, the strip-shaped positive electrode and the strip-shaped negative electrode are not brought into contact with each other. In addition, by employing the above-described method of manufacturing the spiral electrode structure for a battery by winding the separator with the separator interposed therebetween, the separator and the core split groove portion are close to the surface at the time of extraction, and wrinkles are generated in the separator. In addition, since the adhesion between the winding core and the separator is reduced, it is possible to easily remove the element from the winding core after winding.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus for manufacturing a spiral structure according to the present invention will be described below with reference to FIG.

FIG. 1 is an overall view (A) of a winding core used in the apparatus for manufacturing a spiral-type structure of the present embodiment, a sectional view (B) near the center of the winding core, and a detailed view of a tip end of the winding core. (C) is shown. Here, the split pin 2 is used for winding the separator, the positive electrode, and the negative electrode. The outer shape of the split pin 2 is substantially cylindrical. The split groove 3 is formed of a slit parallel to the center axis of the core from the tip of the split pin 2 to about 2/3 of the total length of the split pin, and is used for starting winding with a separator interposed therebetween. Each of the opposing surfaces of the split groove 3 is provided with a tapered portion indicated by 3a.
From the tip of the to about 2/3 of the length of the split groove 3,
0.5 degrees or more so that the width of the groove becomes wider toward the tip
It has a slope of 0.65 degrees. A rounded inclined portion is provided at the leading end of the core to facilitate installation of the separator. A cylindrical hole having the same center axis as the center axis of the winding core 1 is provided at the distal end portion to secure the spindle support pin 4 securely.

Next, the steps of manufacturing the spiral structure will be described. The winding process is the same as in the conventional example. Here, a description will be given of a core removal process after the winding.
This extraction process is basically the same as the operation of the conventional example, and starts from the above-described winding end stage (see FIG. 6A).

As a first step, the core 1 starts to retreat, the element end hits the guide holder 11, and the core 1 starts to come off from the element 5. The inclined portion at the tip of the core 1 is disengaged from the spindle support pin 4, and the core 1 is bent from the tip side by the winding tension, and a gap is created between the inner diameter of the element and the core 1 (FIG. 6).
B).

Next, as a second step, the core 1
Retreats. According to the core 1 of the present embodiment, the separator and the core split groove portion are close to the surface at the time of extraction, so that wrinkles are generated in the separator by tapering inward of about 2/3 from the end of the split groove of the core 1. Disappears. (See FIG. 7A).

Next, as a third step, the retraction of the core 1 is completed, and the core 1 is removed cleanly from the element 5 (see FIG. 7B).

As described above, according to the present embodiment, as shown in FIG. 1, 0.5 to 0.65 degrees is applied to each surface inside about 2/3 of the leading end of the split groove of the core. By forming the taper, the separator and the core split groove portion are close to the surface at the time of extraction, so that the separator does not have wrinkles and can be easily extracted.

Next, an embodiment of the method of manufacturing the spiral structure according to the present invention will be described with reference to FIG. The steps of manufacturing the spiral structure are the same as those of the above-described embodiment with regard to the steps 1 to 3 of the winding step and the core removing step.

In step 4, after winding the separator or the like in the direction of the arrow as shown in FIG. 2A, the element 5 is held stationary by the element holding actuator 6 as shown in FIG. The core 1 is reversed in the range of 1/8 rotation to 1/2 rotation. As a result, the tightening of the separator at the central portion of the element is reduced, and the close contact between the core and the separator is reduced.

As described above, according to this embodiment, the tightness of the separator at the center of the element is reduced, and the close contact between the core and the separator is reduced. Can be facilitated. Further, since the element after winding can be easily removed from the core, the operation rate can be improved and the occurrence rate of defective products can be reduced.

On the other hand, as the spiral structure manufactured in the above-described embodiment, it is needless to say that the spiral structure can be applied to a spiral electrode structure of a lithium ion secondary battery.

It should be noted that the present invention is not limited to the above-described embodiment, but can adopt various other configurations without departing from the gist of the present invention.

[0034]

As described above, according to the present invention,
At the time of extraction, the separator and the core split groove portion are close to the surface contact, so that no wrinkles occur in the separator, and the extraction can be facilitated. In addition, the tightening of the winding of the separator at the center of the element is reduced, and the close contact between the winding core and the separator is reduced, so that the element can be easily removed from the winding core after winding. Further, since the element after winding can be easily removed from the core, the operation rate can be improved and the occurrence rate of defective products can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a core of an embodiment of a spiral-shaped structure manufacturing apparatus of the present invention.

FIG. 2 is a perspective view showing an apparatus used in an embodiment of the method of manufacturing a spiral structure according to the present invention.

FIG. 3 is a configuration diagram showing a core of a conventional spiral-shaped structure manufacturing apparatus.

FIG. 4 is a perspective view showing a winding step in manufacturing a conventional spiral structure.

FIG. 5 is a perspective view showing a winding step in manufacturing a conventional spiral structure.

FIG. 6 is a perspective view showing a step of removing a core after winding in manufacturing a conventional spiral structure.

FIG. 7 is a perspective view showing a step of removing a core after winding in manufacturing a conventional spiral-type structure.

[Explanation of symbols]

 1 core 2 split pin 3 split groove 3a taper

Claims (4)

(57) [Claims] 1. A winding start sandwich the split grooves of the split pin for winding which is driven to rotate the belt-like separator further swath
So that the positive and negative electrodes do not touch each other.
In the apparatus for manufacturing a spiral wound structure for a battery, which is manufactured by laminating the split pins while separating the spiral pins while interposing a separator therebetween, the split grooves of the split pins are arranged such that a gap between the split grooves is on the tip side. A battery characterized by having a tapered portion that becomes gradually wider
For manufacturing spiral type structure. 2. A split pin for winding, which is driven to rotate.
Sandwich the strip-shaped sheet material in the groove and start winding.
After laminating, remove the split pins and manufacture
In the apparatus for manufacturing a spiral-type structure for a pond electrode , the split groove of the split pin has a leading end with a gap between the split grooves.
A battery having a tapered portion that becomes wider toward the side.
Equipment for manufacturing spiral structures for electrodes. 3. After winding the strip-shaped sheet material by rotating the split pin for winding in the winding direction using the apparatus for manufacturing a spiral structure for a battery electrode according to claim 1 or 2. ,
Turn the split pin for winding up in the direction opposite to the winding direction.
A method for manufacturing a spiral-type structure for a battery electrode, wherein a split pin is extracted by reverse rotation in a range of 8 rotations to 1/2 rotation. 4. A spiral type battery for a battery by winding a separator by sandwiching the separator in a split groove of a splitting pin for winding, and further winding the separator so as to prevent the positive and negative strips from contacting each other. The method for manufacturing a spiral type structure according to claim 3, wherein the electrode structure is manufactured.