JP2000215885A - Cutting device for polymer battery electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device for a polymer battery electrode capable of canceling possibility of removal of electrode mix and production of burrs on a cutting surface and capable of generalized and highly productive cutting. SOLUTION: This cutting device has a first cylindrical roller 9a rotatably disposed, a second roller 9b disposed in parallel with it while leaving a space to interveningly insert a polymer electrode sheet 13 to be cut, a first cylindrical cutting blade 10a integrally fitted to the peripheral surface of the roller 9a, a pair of first cylindrical bodies 11a, 11a' of cushion rubber integrally fitted to the peripheral surface of the roller 9a so as to fixingly sandwich the both sides of the cutter blade, a second cylindrical cutting blade 10b integrally fitted to the peripheral surface of the roller 9b with its one side aligned to the one side of the blade 10a, a pair of second cylindrical bodies 11b, 11b' of cushion rubber integrally fitted to the peripheral surface of the roller 9b so as to fixingly sandwich the both sides of the second cylindrical cutting blade, and a rotation driving mechanism 12 to rotate the rollers 9a, 9b in a mutually different direction, and at least one of peripheral rim parts of the other sides of the blades 10a, 10b is tapered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for cutting an electrode for a polymer battery.

[0002]

2. Description of the Related Art Small, lightweight, thin, large-capacity, high-voltage power supplies are required for power supplies for portable telephones, television cameras, and the like. And for such a request,
For example, positive electrode layer, polymer electrolyte layer (separator)
Also, a lithium polymer type non-aqueous solvent battery having a thickness of about 0.5 mm and having an electrode element in which a negative electrode layer is laminated and integrated into a sheet (thin) is known (for example, US Pat. No. 5,296,318). book).

FIG. 5 is a cross-sectional view showing a main part of the lithium polymer electrolyte battery. In FIG. 5, reference numeral 1 denotes an electrolyte-retaining property which functions as a separator which is a system of a polymer such as a hexafluoropropylene-vinylidene fluoride copolymer and an ethylene carbonate solution such as a lithium salt. Sheet-shaped polymer / electrolyte, 2 is a positive electrode layer (positive electrode mixture layer) containing an active material such as a metal oxide, a non-aqueous electrolyte and an electrolyte-retaining polymer
A sheet-like positive electrode formed by laminating 2a on a current collector 2b, 3 collects a negative electrode layer (negative electrode mixture layer) 3a containing an active material for absorbing and releasing lithium ions, a non-aqueous electrolyte and an electrolyte-retaining polymer. It is a sheet-like negative electrode laminated on the body 3b. here,
Examples of the active material of the positive electrode 2 include lithium manganese composite oxide, manganese dioxide, lithium-containing cobalt oxide, lithium-containing nickel cobalt oxide, lithium-containing amorphous vanadium pentoxide, chalcogen compound, and the like. On the other hand, examples of the negative electrode active material include fired products such as bisphenol resin, polyacrylonitrile, and cellulose, and fired products of coke and pitch.
Note that these negative electrode active materials may be in a form containing natural or artificial graphite, carbon black, acetylene black, Ketjen black, nickel powder, nickel powder, or the like.

[0004] Further, the polymer / electrolyte 1 is prepared by adding lithium perchlorate, lithium hexafluorophosphate, borane to a non-aqueous solvent such as ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate or methyl ethyl carbonate. Examples thereof include those in which lithium tetrafluoride, lithium arsenide lithium, lithium trifluoromethanesulfonate, and the like are dissolved at about 0.2 to 2 mol / l.

[0005] In the production of this type of polymer battery, lamination of electrode elements is performed on the premise. That is, since the sheet-like positive electrode 2, the sheet-like separator (polymer / electrolyte) 1, and the sheet-like negative electrode 3, which are the electrode elements, are combined in a laminated manner, each of the sheet-like electrode element members 1, 2, 3 has a predetermined shape. Cut into dimensions,
After laminating, heating and pressurizing to integrate, a plasticizer extraction treatment and the like are performed, and then a required external lead is attached and mounted in the battery outer can. Next, the required electrolyte is supplied and injected, and the opening of the battery outer can is sealed while the external lead is being led out, thereby producing a polymer battery.

[0006] By the way, the sheet-like electrode element is generally cut and separated as follows. FIG.
In a cross-sectional view schematically showing the embodiment, first, for example,
A flat plate-shaped cutting device having a cutting portion 6 formed by sandwiching both sides of a fixed blade 4 made of SKD11 with cushioning rubbers 5a and 5b is prepared. Next, the cutting unit 6 of the cutting device
For example, the sheet-shaped positive electrode 2 is placed on the surface, and further, a resin plate (for example, a solid) 7 is laminated on the sheet-shaped positive electrode 2, and pressure is applied to the sheet-shaped positive electrode 2 through the resin plate 7. The sheet-shaped positive electrode 2 is cut by so-called push cutting.

[0007]

However, in the case of the means for cutting the sheet-like electrode (electrode sheet), not only the size of the electrode which can be cut by the fixed cutting blade 4 is restricted, but also the fixed blade is cut. The fixed blade 4 is liable to be worn or damaged because the contact between the tip of the resin blade 4 and the resin plate 7 is inevitable. Therefore, there is a problem that the frequency of attachment and detachment replacement of the fixed blade 4 is high, and the cost and productivity are easily adversely affected. Also,
The wear / damage of the fixed blade 4 depends on the electrode mixture 2a in the cut surface.
(3a) causes peeling-off and generation of burrs, and the current collector 2b (3b) is likely to be shifted or misaligned, so that the yield is reduced or the quality of the sheet-like electrode 2 (3) is impaired. There is great fear.

[0008] The present invention has been made in view of such circumstances, the separation of the electrode mixture and the occurrence of burrs on the cut surface are eliminated, and a versatile and highly productive cut is realized. An object of the present invention is to provide a possible electrode cutting device for a polymer battery.

[0009]

According to a first aspect of the present invention, a first cylindrical roller rotatably disposed and a polymer electrode sheet to be cut are inserted into the first cylindrical roller. A second cylindrical roller arranged in parallel with an interval for the first cylindrical roller, a first cylindrical cutting blade integrally fitted and disposed on the outer peripheral surface of the first cylindrical roller, A pair of first cushioning rubber cylinders that are fitted and disposed integrally on the outer peripheral surface of a first cylindrical roller by sandwiching both side surfaces of the first cylindrical cutting blade, and the first cylinder; A second cylindrical cutting blade, one side of which is aligned with the profile cutting blade, and which is integrally fitted and disposed on the outer peripheral surface of the second cylindrical roller; and the second cylindrical cutting. A pair of second cushioning rubber cylinders which are fitted and disposed integrally on the outer peripheral surface of the second cylindrical roller by sandwiching both side surfaces of the blade And a rotation drive mechanism for rotating the first and second cylindrical rollers in directions different from each other, and the other side peripheral edge of at least one of the first and second cylindrical cutting blades A device for cutting an electrode for a polymer battery, characterized in that the surface is tapered.

According to a second aspect of the present invention, in the apparatus for cutting an electrode for a polymer battery according to the first aspect, the other side peripheral surface of the cylindrical cutting blade is tapered to 15 to 45 °. I do.

In the first and second aspects of the present invention, the first and second cylindrical rollers are made of metal, such as tool steel, and generally have a diameter of about 8 to 15 cm and a roller width of 10 to 30.
It is composed of about cm. One of the cylindrical rollers is slidably supported on the opposing surface so that the distance between the opposing peripheral surfaces can be changed and controlled. Further, the two cylindrical rollers are configured to rotate in mutually different directions at substantially the same peripheral speed by using a motor or the like as a drive source.

Further, each of the first and second cylindrical rollers has a cylindrical cutting blade on its outer peripheral surface, and a pair of cushioning rubber cylinders sandwiching both side surfaces of the cylindrical cutting blade. It is configured to be integrally fitted and disposed. Here, the double cylindrical cutting blade is, for example, a ring made of SKD11 or carbide metal having an inner diameter of about 8 to 15 cm, an outer diameter of about 10 to 17 cm, and a width of about 3 to 10 mm. Also, a pair of cushioning rubber cylinders, for example, a rubber inner diameter of 8 to 15 cm
It is a cylindrical body of about 10 to 17 cm in outer diameter and about 5 to 15 cm in length, and is integrally fitted and arranged in a substantially symmetrical positional relationship.

In the above-mentioned double cylindrical cutting blade, one side surface of the other cylindrical cutting blade slides against one side surface of the other cylindrical cutting blade. Positions are selected and integrally fitted so that the electrode sheet or the like is cut by engagement of the cutting blade. In other words, it is necessary to adopt a structure in which one side is aligned with one cylindrical cutting blade, and another cylindrical cutting blade is fitted and disposed integrally on the outer peripheral surface of the other cylindrical roller. There is.

The two cylindrical cutting blades have the above-described configuration and arrangement, and at least one of the cylindrical cutting blades has a tapered peripheral surface on the other side. That is, the peripheral surface of the opposite side (the other side) of the two cylindrical cutting blades that is opposite to the one side that slides and meshes is tapered. Here, the peripheral edge surface taper of the other side surface of the cylindrical cutting blade has an acute angle at the tip, and is generally 15 to 45.
° is preferred.

By this tapering, sharp cutting or cutting is easily and surely performed, and generation and detachment of the electrode active material powder accompanying the cutting or cutting is eliminated or avoided. And in the continuous cutting operation of the sheet-like electrode, there is no generation and detachment of the electrode active material powder,
Further, the sheet electrode is cut with high yield and high accuracy without generating burrs on the cut surface.

According to the first and second aspects of the present invention, for example, both sides of the positive electrode layer are resiliently pressed at the stage of conveying and passing between the peripheral surfaces of the pair of rotating cylindrical rollers. The required cutting is performed by pushing and cutting with cutting blades from both sides. That is, not only the cutting shape is not restricted, but also a continuous cutting operation is possible, and also high-precision cutting can be performed without causing separation of the electrode mixture and generation of burrs on the cutting surface.

Moreover, since the cutting blade involved in the cutting is cylindrical and the region acting on the cutting changes sequentially, wear and reduction of the cutting blade are reduced, and the cutting blade functions as a highly durable cutting device.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. 1, 2, 3 and 4. FIG.

FIG. 1 is a partially cutaway sectional view of a main part showing a schematic configuration of a device for cutting an electrode for a polymer battery according to a first embodiment. In FIG. 1, reference numerals 8a and 8b denote a pair of supports having rotating bearings fixedly arranged on a base (not shown), and reference numeral 9a denotes a first support rotatably supported by the supports 8a and 8b. The cylindrical roller 9b is a second cylindrical roller rotatably supported by the supports 8a and 8b.

The second cylindrical roller 9b is parallel to the first cylindrical roller 9a at a required interval in order to insert a polymer electrode sheet to be cut (cut) into the first cylindrical roller 9a. Are located. Here, the first cylindrical roller 9a
Each of the second cylindrical roller 9b and the second cylindrical roller 9b is made of stainless steel and has a cylindrical shape with a diameter of about 10 cm and a length of about 30 cm.

Reference numeral 10a denotes a first cylindrical cutting blade integrally fitted on the outer peripheral surface of the first cylindrical roller 9a;
11a and 11a 'are a pair of first cushioning rubbers which are provided integrally with the outer peripheral surface of the first cylindrical roller 9a by sandwiching both side surfaces of the first cylindrical cutting blade 10a. It is a cylinder. On the other hand, 10b is a second cylindrical cutting blade which is aligned with one side surface with respect to the first cylindrical cutting blade 10a and is integrally fitted to the outer peripheral surface of the second cylindrical roller 9b. Blades,
11b and 11b 'are a pair of second cushioning rubbers which are fitted and disposed integrally on the outer peripheral surface of the second cylindrical roller 10b by sandwiching both side surfaces of the second cylindrical cutting blade 10b. It is a cylinder.

Here, the two cylindrical cutting blades 10a and 10b are:
It is a ring made of SKD11 with an outer diameter of about 13 cm and a width of about 5 mm. As shown in FIG.
Is tapered by about 15 to 45 degrees, for example, about 30 degrees all around. The cushioning rubber cylinders 11a, 11b, 11a 'and 11b' are rubber cylinders having an outer diameter of about 13 cm and a length of about 15 cm. Therefore, the outer peripheral surfaces of both cylindrical cutting blades 10a and 10b are slightly smaller than the outer peripheral surfaces of the first cushioning rubber cylinders 11a and 11a 'and the second cushioning rubber cylinders 11b and 11b'. It has a protruding structure.

Further, as shown in FIG.
This is a rotation drive mechanism for rotating the first and second cylindrical rollers 9a and 9b in different directions from each other, and includes gears 12a and 12b mounted on the shafts of both cylindrical rollers 9a and 9b, and the gears 12a and 12b.
The motor 12c is configured to rotate the motor 12b via a speed reduction mechanism (not shown). In FIG. 2, reference numeral 13 denotes an electrode sheet to be cut.

Next, the operation of the cutting apparatus having the above configuration will be described.

First, as a body to be cut, for example, a positive electrode (positive electrode mixture) layer containing an active material such as a metal oxide and an electrolyte-retaining polymer is laminated and integrated with a mesh-like current collector to a width of about 4 to 30 cm. A sheet-like positive electrode (positive electrode sheet) 13 having a thickness of about 0.1 to 0.5 mm is prepared. On the other hand, by the operation of the rotation drive mechanism 12, the first cylindrical roller 9a and the second cylindrical roller 9b are simultaneously rotated in different directions at the same peripheral speed. In this state, the positive electrode sheet 13 is supplied and passed between opposing outer peripheral surfaces of both cylindrical rollers 9a and 9b.

In the process of passing between the opposing outer peripheral surfaces of the cylindrical rollers 9a and 9b, the positive electrode sheet 13 has both main surfaces on the outer peripheral surfaces of the first cushioning rubber cylinders 11a and 11a 'and the second outer surface.
While holding it with the cushioning rubber cylinder 11b, 11b '
Cutting is performed by pushing and cutting the outer peripheral tips of the two cylindrical cutting blades 10a and 10b in sliding contact with each other. That is, the cut body 13 is made of the cushioning rubber cylinder 11a, 11a ', 11b,
In a state where the entire surface is elastically pressed by the outer peripheral surface of 11b ', the cylindrical cutting blades 10a and 10b are locally pressed and cut off from both sides.

In addition, the outer peripheral tip of the cylindrical cutting blade 10b is tapered so that it comes into sliding contact with the tip corner of the cylindrical cutting blade 10a to exhibit a sharp push-cutting action. Therefore, high-precision dimensional shape cutting can be performed with good yield without causing separation of the electrode mixture or generation of burrs on the cut surface, and without causing displacement of the current collector.

In the above configuration, the cylindrical cutting blade 10b
The outer edge of the taper is tapered, but a cylindrical cutting blade 1
The outer end of Oa may be tapered.

FIG. 4 is a partially cut-away sectional view of a main part showing a schematic configuration of a device for cutting an electrode for a polymer battery according to a second embodiment. In the case of this embodiment, the first cutting edge is provided except that the cylindrical cutting blades 10a and 10b each having a taper of about 15 to 45 °, for example, about 30 ° are attached to the peripheral surface of the other side surface. The configuration is similar to that of the embodiment. Therefore, the same reference numerals are given to the structural members, and the detailed description of the configuration is omitted.

The basic operation of the cutting apparatus of this embodiment is the same as that of the first embodiment, but the outer peripheral tips of both the cylindrical cutting blades 10a and 10b are tapered. Therefore, the sharp tip portions are in sliding contact with each other, so that a sharp push-off action is more easily exhibited. Therefore, it is possible to more efficiently cut the high-precision dimensional shape without causing the separation of the electrode mixture or the occurrence of burrs on the cut surface, and without causing the current collector to be displaced. Done.

The present invention is not limited to the above-described example, and various modifications can be made without departing from the spirit of the invention. For example, the material and dimensions of the cylindrical roller, the material and dimensions of the cushioning rubber cylinder, and the material and dimensions of the cutting blade correspond to the material and cutting shape of the polymer battery electrode as the object to be cut. It can be selected as appropriate.

[0032]

According to the first and second aspects of the present invention, a high-quality electrode for a polymer battery can be cut at a high yield and in mass production. That is, in the cutting of the polymer battery electrode, there is no separation of the electrode mixture and no generation of burrs on the cut surface, and the current collector grid is also prevented from being offset (displaced), so that the cutting yield is greatly reduced. An improved and high quality polymer battery electrode can be provided in mass production.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a schematic configuration of a cutting device for an electrode for a polymer battery according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view showing a main part configuration of a device for cutting an electrode for a polymer battery according to a first embodiment.

FIG. 3 is a side view schematically showing an arrangement state of a cutting roller in the polymer battery electrode cutting apparatus according to the first embodiment.

FIG. 4 is a partially cutaway cross-sectional view showing a schematic configuration of a device for cutting an electrode for a polymer battery according to a second embodiment.

FIG. 5 is a cross-sectional view illustrating a schematic configuration example of an electrode for a polymer battery.

FIG. 6 is a cross-sectional view schematically showing a cutting state of a conventional polymer battery electrode cutting apparatus.

[Explanation of Symbols] 1 ... sheet separator 2 ... sheet positive electrode 2a ... positive electrode mixture layer 2b ... positive electrode current collector 3 ... sheet negative electrode 3a ... negative electrode mixture layer 3b ... negative electrode current collection Body 9a, 9b: Cylindrical rollers 10a, 10b: Cylindrical cutting blades 11a, 11a ', 11b, 11b': Cushion rubber cylinder 12: Rotary drive mechanism

Claims (2)

[Claims] A first cylindrical roller rotatably arranged; and a first cylindrical roller disposed parallel to the first cylindrical roller with a space for inserting a polymer electrode sheet to be cut. A second cylindrical roller, a first cylindrical cutting blade integrally fitted to the outer peripheral surface of the first cylindrical roller, and both side surfaces of the first cylindrical cutting blade. A pair of first cylindrical members which are sandwiched and fitted and disposed integrally with the outer peripheral surface of the first cylindrical roller.
And a second cylinder, one side of which is aligned with the first cylindrical cutting blade and integrally fitted to the outer peripheral surface of the second cylindrical roller. A pair of second cutting blades, each of which has a pair of second cutting blades, which are disposed integrally with the outer peripheral surface of a second cylindrical roller by sandwiching both side surfaces of the second cylindrical cutting blade.
And a rotary drive mechanism for rotating the first and second cylindrical rollers in directions different from each other, and at least one of the first and second cylindrical cutting blades. An apparatus for cutting an electrode for a polymer battery, wherein a peripheral edge surface of the other side surface is tapered. 2. The peripheral edge surface of the other side surface of the cylindrical cutting blade is 15 to
2. The taper according to claim 1, wherein the taper is 45 degrees.
An apparatus for cutting an electrode for a polymer battery according to the above.