KR101003704B1 - Take-up device, spirally-winding element, and method of manufacturing spirally-winding element - Google Patents

Abstract

Winding device and winding which can make the material of core core have degree of freedom, and can improve winding precision without causing complexity of mechanism and increase of cost Provided is a method of manufacturing a device.

The adhesive tape 51 made of polypropylene is bonded to at least one part of the surface of the core core 2. Then, by the heat welding means 43, the two or more separators 3 and 4 made of polypropylene with respect to the adhesive tape 51 are thermally welded at the same time. After fixing, the separators 3 and 4 are cut | disconnected and the electrode foil etc. are wound up. Since two separators 3 and 4 can be fixed at the same time, there is no need to fix the end portions by shifting them, and the materials of the core core 2 are not limited at all because they are fixed indirectly. .

Battery element, core core, separator, plus electrode foil, negative electrode foil, strip shape, winding device, plus electrode foil supply means.

Description

Winding device, winding element and manufacturing method of winding element {TAKE-UP DEVICE, SPIRALLY-WINDING ELEMENT, AND METHOD OF MANUFACTURING SPIRALLY-WINDING ELEMENT}

TECHNICAL FIELD This invention relates to the winding device, the winding element, and its manufacturing method for obtaining the winding element integrated in a secondary battery etc., for example.

For example, a battery element used as a secondary battery such as a lithium ion battery is wound by a strip formed of a positive electrode foil, a negative electrode foil, and two separators. Consists of.

DESCRIPTION OF RELATED ART Conventionally, as a winding apparatus for winding a strip | belt-shaped body, the said electrode foil and a separator are wound up about a rotatable core (rotation shaft), and the strip | belt-shaped body (winding body) wound after winding up is removed from the said rotation shaft. Methods are known. By the way, the winding pressure of the wound body makes it relatively difficult to remove the wound body from the rotating shaft, or when removing the wound body, it may cause damage to the separator, the electrode foil, or the like. Moreover, there exists a possibility that a position shift may generate | occur | produce in the edge part of the electrode foil and separator located in the center part of a winding body by winding pressure. If such a position shift occurs, the distance between the electrode foils will be too long, and as a result, the central portion of the wound body may not be able to fully exhibit its function as a battery.

Therefore, in order to solve such an inadequate problem, a cylindrical core is attached to the rotating shaft, the belt core is wound around the core core, and the belt body is wound up. Later, the technique which removes a winding element for every core core, in other words, uses the winding element which consists of a core core and a strip as a battery element is proposed (for example, refer patent document 1 etc.).

By the way, in the above technique, first, it is necessary to fix a separator to the surface of a core core, and to wind up a separator and electrode foil after that. As a method of fixing a separator to the surface of a core core, first, the method of fixing the edge part of a separator using an adhesive tape is considered (for example, refer patent document 2 etc.). Second, instead of the adhesive tape, the double-sided adhesive tape is bonded to the core core in advance, and the peeling paper is peeled off, and then the end portion of the separator is bonded with the double-sided adhesive tape. I think how.

Moreover, as a 3rd method, the method of heat-welding the edge part of the separator which consists of resin materials to the core core which consists of resin materials is also considered (for example, refer patent document 3 etc.).

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-144339

[Patent Document 2] Japanese Patent Application Laid-Open No. 8-288287

[Patent Document 3] Japanese Patent Application Laid-Open No. 2001-185220

However, in practice, it is necessary to fix two separators to the core core, but in the first (first) method, that is, the method of fixing the end portion of the separator using an adhesive tape, the ends of the two separators It is impossible to fix them all at once with the edges aligned. This is because the separator on the inner layer side is hardly adhered. Therefore, in adopting the first method, in order to secure the two separators more reliably, it is necessary to fix them in a state where the end positions of the separators are shifted from each other. Therefore, in this case, a complicated mechanism is required, such as joining in the state where the two edges of the separators are accurately shifted each time, or performing length adjustment. In addition, in this case, it may not only cause a problem in correct positioning, but also cause a meandering of the separator, and an S-shape. More complicated mechanisms are needed.

Moreover, also when joining a 2nd (second) method, ie, a double-sided adhesive tape to a core core beforehand and joining the edge part of a separator there, similarly to the above, in the state which shifted the edge position of each separator mutually. It needs to be fixed. In addition, in the second method, since it is necessary to use a double-sided adhesive tape, an increase in cost is required, and a mechanism for removing the release paper is also required separately.

On the other hand, in the third (third) method, that is, the method of thermally welding the end portion of the separator made of the resin material to the core core made of the resin material, it is not impossible to make the two edges of the separator aligned and fix them. not. For example, in the technique described in Patent Document 3, the purpose is that the end edges of the separators are aligned and thermally welded to each other, and the thermal welding portions are thermally welded to the core core (contents). By the way, in the 3rd method, there exists a fault that the raw material which can be used as a core core is limited to the resin raw material which can be heat-welded. That is, in the 3rd method, metal materials, such as aluminum, cannot be used as a core core. In addition, in the technique described in Patent Document 3, the work of arranging the ends of the separator with heat welding and the heat welding of the heat-welding portion to the core core are required, resulting in the complexity of the mechanism in this sense. Throw it away.

This invention is made | formed in view of the said situation, The objective is the winding which can make the raw material of a core core have freedom, and can aim at the improvement of the winding precision, without complicating a mechanism and increasing cost. It is providing the apparatus, the winding element, and its manufacturing method.

Hereinafter, each means suitable for solving the said objective is classified and described for each item. Moreover, if necessary, the effect unique to the corresponding means is added.

Sudan 1.

Rotation means for allowing the cylindrical core core to be rotatable about its axis,

Separator fixing means for fixing two strip-shaped thermoplastic resin separators to the core core;

Electrode foil supply means for supplying a positive electrode foil and a negative electrode foil toward the core core side, respectively,

After the two cores are fixed to the core core, the positive electrode foil and the negative electrode foil are respectively passed through the separators while the core core is rotated based on the operation of the rotating means ( A winding device configured to wind in an insulated state with each other),

The separator fixing means,

Coating layer applying means which provides a coating layer made of a thermoplastic resin with respect to at least one part of the surface of the said core core,

And a heat welding means for thermal welding at the same time in the state where two sheets of the separator are laminated on the coating layer.

According to the said means 1, two strip | belt-shaped separators are adhere | attached with respect to a core core by a separator fixing means. Then, while the core core is rotated based on the operation of the rotating means, the positive electrode foil and the negative electrode foil are supplied toward the core core side by the electrode foil supply means, and are respectively wound up in an insulated state through each separator. . And finally, a coiling element is obtained by peeling off every core core.

By the way, in the means 1, the coating layer made of a thermoplastic resin is provided with respect to at least one part of the surface of a core core by a coating layer provision means. Then, the thermal welding means of the separator fixing means is thermally welded at the same time in a state where two separators are superposed on the coating layer. Therefore, since two separators can be fixed simultaneously, it is not necessary to shift the edge part of a separator and adhere | attach them like the conventional 1st, 2nd method, and can reduce the complexity of a mechanism. Moreover, since it is not necessary to use a double-sided adhesive tape, increase of cost can be suppressed. Moreover, since it is not necessary to heat-weld a separator to a core core directly like the conventional 3rd method, it is good to heat-weld through a coating layer, The raw material of a core core is not limited at all. Therefore, metal materials, such as aluminum, etc. can also be used, for example, and the material of a core core can be made free.

The coating layer may be a resin coating layer formed by, for example, softening or melting, or by attaching and solidifying a thermoplastic resin material dissolved in a predetermined solvent to the surface of the core core. The adhesive tape may be used as in 2.

Sudan 2.

Rotation means for allowing the cylindrical core core to be rotatable about its axis,

Separator fixing means for fixing two strip-shaped thermoplastic resin separators to the core core;

Electrode foil supply means for supplying a positive electrode foil and a negative electrode foil toward the core core side, respectively,

After the two cores are fixed to the core core, the positive electrode foil and the negative electrode foil are rotated through the respective separators while the core core is rotated based on the operation of the rotating means. As a winding device configured to wind up in an insulated state,

The separator fixing means,

Adhesive tape bonding means for bonding an adhesive tape made of thermoplastic resin to at least a part of the surface of the core core;

And a heat welding means for thermal welding at the same time in a state where two sheets of the separator are laminated on the adhesive tape.

According to the means 2, basically the same effects as in the means 1 are obtained. In particular, in the means 2, by the adhesive tape bonding means, at least a part of the surface of the core core is bonded with a thermoplastic resin adhesive tape, and at the same time heat-welding in the state where two sheets of the separator are overlapped with the adhesive tape. do. Thus, by using an existing adhesive tape, the core (coating layer can be attached) can be bonded to the core core, and at this time, it is only necessary to arrange a mechanism which is not so complicated as adhesive tape bonding means. It can be planned.

Sudan 3.

The said adhesive tape joining means can join the adhesive tape of 1 week in length exactly with respect to the surface of the said core core, The winding apparatus of the means 2 characterized by the above-mentioned.

Like the means 3, by bonding the adhesive tape of exactly one week length to the surface of the core core, a step due to the presence or absence of the adhesive tape is not formed in the circumferential direction. And since it is good to wind up without worrying about a step | step in this way, the separator to be used can be suppressed to the minimum. As a result, it is possible to suppress the increase in cost and to reduce the size of the wound element.

Sudan 4.

The said adhesive tape bonding means can bond an adhesive tape to the both ends of the longitudinal direction of the core core at least, The winding apparatus as described in the means 2 or 3 characterized by the above-mentioned.

As in the means 4, it is preferable that the adhesive tape is bonded to at least the longitudinal direction both ends of the core core. As a result, stable fixing of the separator can be achieved. Moreover, when it is set as the structure partly joined to the both ends of a longitudinal direction, compared with the case where it joins to the whole surface of a core core, the usage-amount of an adhesive tape can be suppressed and cost increase suppression can be aimed at. There is a number.

Sudan 5.

The rotating means is provided with a rotating shaft which can be inserted into the insertion hole formed in the core core and is rotatably supported.

The rotational shaft is provided in plurality in correspondence with a winding position for winding the separator and the positive electrode foil and a detachable position for attaching and detaching the core core, and is movable between the two positions. Is composed,

The separator fixing means is provided corresponding to the winding position and is provided with cutting means capable of cutting the separator.

The thermal welding means is capable of thermal welding two separators extending from the detachable position with a predetermined tension.

The said cutting means cut | disconnects the said separator at once two times after the said heat welding, The winding apparatus in any one of the means 1-4 characterized by the above-mentioned.

According to the means 5, the separator and the positive electrode foil are wound around the rotating shaft located at the winding position. On the other hand, the core core is attached to and detached from the rotating shaft located at the detachable position. That is, the winding element after the winding is completed is removed, and the core core is newly mounted. Each axis of rotation can move between both positions. Moreover, a separator fixing means is provided corresponding to a winding position. In the thermal welding means, two separators extending from the detachable position (the winding element) are thermally welded in a state where a predetermined tension is applied. In addition, after the heat welding, the separator is cut at once by two cutting means.

As described above, in the means 5, the coating layer or the adhesive tape with respect to the core core positioned at the wound position while the two separators extending from the previous winding element moved to the detachable position are still connected without being cut. It heat-welds through and after that, two separators are cut | disconnected at once. Therefore, the tip is fixed to the core core in a state where the tip is aligned without aligning the leading edges of the separators one by one. Therefore, the simplification in structure can be made remarkably. In addition, since the thermal welding is performed in a state where a predetermined tension is applied, there is no need to worry about meandering or the like of the separator.

Sudan 6.

As a winding element which wound the positive electrode foil and the negative electrode foil with respect to the core core in the insulated state with each other via the strip | belt-shaped 2 sheets of thermoplastic resin separator,

At least a part of the surface of the core core is provided with a coating layer made of a thermoplastic resin,

The wound element is heat-welded in the state in which 2 sheets of said separators overlapped with respect to the said coating layer.

According to the means 6, basically, as in the case 1, two separators can be fixed at the same time, there is no need to fix the separator by shifting the end portion of the separator as in the first and second methods. Can reduce the complexity. Moreover, since it is not necessary to use a double-sided adhesive tape, increase of cost can be suppressed. Moreover, since it is not necessary to heat-weld a separator to a core core directly like the conventional 3rd method, it is good to heat-weld through a coating layer, The raw material of a core core is not limited at all. Therefore, metal materials, such as aluminum, etc. can also be used, for example, and the material of a core core can be made free.

Sudan 7.

As a winding element which wound the positive electrode foil and the negative electrode foil with respect to the core core in the insulated state with each other via the strip | belt-shaped 2 sheets of thermoplastic resin separator,

An adhesive tape made of a thermoplastic resin is bonded to at least a part of the surface of the core core,

The winding element with respect to the said adhesive tape is heat-welded in the state in which 2 sheets of said separators overlapped.

According to the means 7, an effect similar to that of the means 2 is obtained. That is, by using the existing adhesive tape, it is possible to simplify the equipment and suppress the increase in cost.

Sudan 8.

The winding core is made of a material other than a thermoplastic resin, and the winding element according to the above-mentioned means 6 or 7.

Like the means 8, even if the core core is a material other than a thermoplastic resin, for example, a metal material such as aluminum, another resin material which cannot be thermally welded, such as a thermosetting resin, the separator can be securely fixed to the core core, The above-mentioned effects can be obtained more surely.

Sudan 9.

The winding element according to any one of the means 6 to 8, wherein the leading edges of the two separators on the innermost side are aligned.

By adopting the configurations of the above-described means 6, 7 and the like, it is possible to easily realize the leading edges of the two separators on the innermost circumference side. As the tip edges are arranged in this manner, it is difficult to adjust the length of the separator.

Sudan 10.

The winding device according to any one of the means 6 to 9, wherein the melting temperature of the adhesive tape is about the same as the melting temperature of the separator.

According to the means 10, incomplete welding by which one side does not melt can be prevented, and more reliable fixation of a separator can be aimed at. For example, when a separator is comprised from PP, it is preferable to use a PP tape also as an adhesive tape.

Sudan 11.

The core core, the positive electrode foil, and the separator are wound around the core core rotatably provided by winding the positive electrode foil and the negative electrode foil in an insulated state through two strips of thermoplastic resin. As a manufacturing method of the wound element for manufacturing the wound element which consists of:

A coating layer applying step of providing a coating layer made of a thermoplastic resin to at least a part of the surface of the core core;

And a heat welding step of thermally welding at the same time in the state where two sheets of the separator are laminated on the coating layer,

And after the separator is fixed to the core core by the thermal welding, the winding of the plus electrode foil and the minus electrode foil is started.

According to the means 11, in the coating layer applying step, a coating layer made of a thermoplastic resin is provided on at least a part of the surface of the core core. In the heat welding step, two sheets of separators are superposed on the coating layer, and at the same time, heat welding is performed. And after a separator is fixed to the core core by the said heat welding, the winding of positive electrode foil and negative electrode foil is started. Therefore, basically the same operation and effect as the means 1 is obtained.

Sudan 12.

A method for manufacturing the wound element according to the means 11, wherein the coating layer has a melting temperature almost the same as that of the separator.

As in the means 12, as the coating layer, it is preferable that its melting temperature is substantially the same as that of the separator. By doing in this way, incomplete welding by which one side does not melt can be prevented, and more reliable fixation of a separator can be aimed at. For example, when a separator is comprised from polypropylene (PP), it is preferable to use PP also as a coating layer. However, it does not necessarily mean that both must be the same material.

Sudan 13.

The core core, the positive electrode foil, and the separator are wound around the core core rotatably provided by winding the positive electrode foil and the negative electrode foil in an insulated state through two strip-shaped thermoplastic resin separators. As a manufacturing method of the wound element for manufacturing the wound element which consists of:

An adhesive tape bonding step of bonding an adhesive tape made of thermoplastic resin to at least a part of the surface of the core core;

And a heat welding step of thermal welding at the same time in the state where two sheets of the separator are laminated on the adhesive tape,

And after the separator is fixed to the core core by the thermal welding, the winding of the plus electrode foil and the minus electrode foil is started.

According to the means 13, basically the same effects as in the means 2 are obtained.

Sudan 14.

The said adhesive tape uses the thing whose melting temperature is about the same as the melting temperature of the said separator, The manufacturing method of the winding element of the means 13 characterized by the above-mentioned.

As in the means 14, as the adhesive tape, it is preferable that the melting temperature thereof is substantially the same as the separator melting temperature. By doing in this way, incomplete welding by which one side does not melt can be prevented, and more reliable fixation of a separator can be aimed at. In the case where the separator is made of PP, it is preferable to use a PP tape as the adhesive tape. In addition, although it is said by each said means, as a raw material which comprises an adhesive tape (coating layer) and a separator, it is preferable that they are a mutually compatible raw material. For example, when a polyolefin resin material is used as a separator, it is preferable to use a polyolefin system as an adhesive tape (coating layer).

Sudan 15.

In the thermal welding step, the two separators extending from the previously wound winding element are thermally welded in a state in which a predetermined tension is applied, and thereafter, the separator is cut at once. The manufacturing method of the winding element as described in any one of 11-14.

According to the means 15, basically the same effects as in the above means 5 are obtained.

According to the present invention, there is provided a winding device, a winding element, and a manufacturing method thereof, which can have a degree of freedom in the material of the core core, and can improve the winding accuracy without causing a complicated mechanism and an increase in cost. You can do it.

EMBODIMENT OF THE INVENTION Below, one Embodiment is described, referring drawings.

First, the structure of the lithium ion battery element as a winding element obtained by the winding apparatus of this embodiment is demonstrated. As shown in FIG. 1, the lithium ion battery element (henceforth a "battery element") 1 is two separators 3 and 4 and plus electrode foil with respect to the core core 2 of a cylindrical shape. The strip | belt-shaped body 7 comprised by (5) and the negative electrode foil 6 is comprised by winding. In addition, in FIG. 1, for convenience of description, there exists a location which shows the space | interval of the separator 3, 4, the positive electrode foil 5, and the negative electrode foil 6 mutually.

In this embodiment, the core core 2 is formed of a material (for example, aluminum) which has sufficient rigidity. Moreover, this core core 2 has the insertion hole 8 whose cross section is a non-circular shape (in this embodiment, the cross section is a square shape (FIG. 3, etc.). Reference).

The separators 3 and 4 have the same width as the length along the longitudinal direction of the core core 2 and prevent the other electrode foils 5 and 6 from contacting each other to cause a short circuit. For this reason, it is comprised by polypropylene (PP) which is a thermoplastic resin material in this case, especially an insulator.

The positive electrode foil 5 and the negative electrode foil 6 also have a width substantially the same as the length along the longitudinal direction of the core core 2, as well as the separators 3 and 4. In addition, an active material (not shown) is applied to both front and back surfaces of the positive electrode foil 5 and the negative electrode foil 6, and ions between the positive electrode foil 5 and the negative electrode foil 6 are passed through the active material. Exchange is possible. More specifically, ions move from the positive electrode foil 5 side to the negative electrode foil 6 side at the time of charging, and on the contrary, ions move from the negative electrode foil 6 side to the positive electrode foil 5 side at the time of discharge. This moves. Moreover, the some positive electrode lead which is not shown in figure extends from the width direction one edge of the positive electrode foil 5, and the other edge in the width direction of the negative electrode foil 6 is extended. A plurality of negative electrode leads (not shown) extend from the projections.

When a lithium ion battery is obtained, the battery element 1 is made of metal and disposed in a cylindrical battery container (not shown), and the positive electrode lead and the negative electrode lead are gathered together. Lose (integrate). The positive electrode leads collected together are connected to a positive electrode terminal component (not shown), and the negative electrode leads collected together are similarly connected to a negative electrode terminal component (not shown), and both terminal components are connected to openings at both ends of the electric container. By providing it, a lithium ion battery can be obtained.

Next, the winding apparatus 11 for manufacturing the battery element 1 will be described. As shown in FIG. 2, the winding device 11 includes a turret 12 rotatably provided. The turret 12 is configured such that the two disk-shaped tables 14 and 15 face each other, and is rotated between the tables 14 and 15. ) Are provided with the centers of the tables 14 and 15 as symmetry centers. In addition, both tables 14 and 15 (turret 12) are configured to be rotatable clockwise, and both tables 14 and 15 are set to rotate synchronously. Thereby, each rotation means 20 is able to move between the detachable position P1 and the winding position P2. In addition, both tables 14 and 15 may be inverted by 180 degrees.

Referring to one example of the rotating means 20 according to FIG. 3, the rotating means 20 extends in the axis C direction and moves the table 15 on the other end from the table 14 on one end of the axis C direction. Winding core 21 serving as a rotating shaft protruding toward and winding core 31 extending in the axis C direction and protruding from the table 15 on the other end side in the axis C direction toward the table 14 on one end side. Consists of.

The core 21 has a rod shape as a whole, and extends from the base portion 22 to the other end side of the base portion 22 and the base portion 22 extending from the other end side of the axis C direction. It consists of a mounting part 23 and the taper step part 24 formed between the said base part 22 and the mounting part 23. As shown in FIG. Moreover, the center axis | shaft of the base part 22, the attaching part 23, and the taper step part 24 correspond with the said axis line C, respectively.

The base portion 22 has a cylindrical shape, and is configured to be movable relative to the table 14 along the axis C direction by driving means (not shown). have. As a result, the core 21 is foldable with respect to the core 31. In addition to this, the base portion 22 is made rotatable relative to the table 14 by the rotation drive means (for example, a motor) (not shown) with the axis C as the rotation axis. 21) The whole is made rotatable relative to the axis C as the rotation axis. That is, the rotation drive means functions as a winding power when winding the strip 7.

The said mounting part 23 is a thing in which the said core core 2 is attached to the outer peripheral part at the time of manufacture of the battery element 1. The mounting portion 23 has a rod shape and has a non-circular cross section (in this embodiment, a cross section is square) so as to correspond to the cross-sectional shape of the insertion hole 8 of the core core 2. It is. In addition, the mounting portion 23 is thinner than the base portion 22, and a pair of tip splitting portions extending in the axis C direction to the front end side portion of the mounting portion 23. Part 25 is formed. In addition, a fitting recess (not shown) capable of fitting the receiving pin 33 to be described later is formed in the inner circumferential portion of the tip splitting portion 25. .

On the other hand, the said core receiving part 31 is the support part 32 which forms a circumference, the receiving pin 33 integrally formed in the said support part 32, and protrudes toward one end side in the axial C direction, and the said receiving pin ( It is provided in the outer peripheral side of 33), and is provided with the receiving part 34 which is a cylindrical shape at the front-end | tip. In addition, the central axis of each of the support part 32, the receiving pin 33, and the receiving part 34 coincides with the axis C.

The said support part 32 is supported with respect to the said table 15 so that relative rotation (free rotation in this embodiment) can make the axis C into a rotation axis, and it cannot support relative movement to the axis C direction.

The receiving pin 33 forms a circumference, and is configured such that most of its outer circumferential surface is substantially parallel to the axis C. As shown in FIG. The receiving pin 33 is disposed inside the receiving portion 34, and the outer diameter thereof is configured to have the same diameter as the inner diameter of the fitting recess or a slightly larger diameter. have. Moreover, in order to make fitting of the receiving pin 33 into the said fitting recess easier, the front end part becomes a thin shape.

The receiving part 34 has an outer diameter approximately the same as the outer diameter of the core core 2, and its front end face is abutable with one end face of the core core 2. The contact surface 35 is provided. Moreover, the annular space between the receiving part 34 and the receiving pin 33 is the accommodating recessed part 36 which can accommodate the front-end | tip part of the mounting part 23, The said receiving pin 33 is When the fitting recess is fitted into the fitting recess, the distal end of the mounting portion 23 is accommodated in the receiving recess 36.

In the rotating means 20 comprised as mentioned above, the core core 2 is attached to the attachment part 23 by the attachment / detachment apparatus 13 mentioned later. Then, the base pin 22 is moved relative to the other end side (table 15 side) along the axis C direction, whereby the receiving pin 33 fits into the fitting recess, and accommodates the receiving portion 34. The tip of the mounting portion 23 is inserted into the recess 36. At this time, the distal end of the mounting portion 23 is enlarged (widened) to the outer circumference side by the receiving pin 33, and further, the other end of the core core 2 is retained from the inner circumference side by the mounting portion 23. It becomes a guarantee. In addition, one end of the core core 2 is brought into contact with and kept in the tapered stepped portion 24. Moreover, the contact surface of the other end of the core core 2 abuts on the to-be-contacted surface 35 of the receiving part 34. In this way, the core core 2 is attached to the rotating means 20.

The description returns to the winding device 11 of FIG. 2. At the point where the two rotating means 20 are movable between the detachable position P1 (right position in the drawing) and the winding position P2 (left position in the drawing) by the rotation of the turret 12. Although it mentioned above, in this embodiment, the attachment / detachment apparatus 13 for attaching and attaching the core core 2 mentioned later and detaching the battery element 1 is provided correspondingly to attachment / detachment position P1. have.

Moreover, the winding position P2 is a position which wound the strip | belt-shaped body 7 with respect to the said core core 2, and the strip | belt-shaped body supply mechanism for supplying the strip | belt-shaped body 7 is provided correspondingly to the said winding position P2, have. In addition, in FIG. 2, the plus electrode foil supply means 16 and the negative electrode foil supply means 17 of the strip | belt-shaped body supply mechanism are shown for convenience of description.

Moreover, in this embodiment, the separator fixing means 41 is provided corresponding to the said winding position P2. The separator fixing means 41 is provided with the adhesive tape bonding means 42, the heat welding means 43, and the cutting means 44 which can cut | disconnect the said separators 3,4. Adhesive tape bonding means 42 is a tape supply means for bonding the adhesive tape 51 which consists of the same raw material (PP in this embodiment) and the said separators 3 and 4 with respect to the surface of the core core 2. And a joining roller and a tape cutter for cutting the tape (both not shown). In this embodiment, the said adhesive tape bonding means 42 is comprised so that the adhesive tape 51 of exactly one week length can be bonded by the edge of the longitudinal direction 2 of the core core 2 (FIG. 6 ( see scattered dot shapes in a).

Moreover, the heat welding means 43 is provided with the heater block 43a (refer FIG. 4). The heater block 43a is provided with the separators 3 and 4 in a state in which a predetermined tension is applied to the two separators 3 and 4 extending from the previously wound battery element 1 located at the detachable position P1. It is comprised so that the core 2 can be pressed down firmly. Moreover, the cutting means 44 is comprised so that the said separator 3, 4 can be cut | disconnected two pieces at once after the said heat welding.

Next, the method for manufacturing the battery element 1 using the above-mentioned winding apparatus 11 is demonstrated.

First, by rotating the turret 12 counterclockwise, one rotation means 20 is moved to the detachable position P1. At this time, the other rotating means 20 is located in the winding position P2. For example, in the example shown in FIG. 4, the rotating means 20 located in the winding position P2 until the winding of the strip | belt 7 is completed until then is moved to the detachable position P1. On the other hand, by that time, the rotating means 20 located in the detachable position P1 and in which the new core core 2 is mounted is moved to the winding position P2.

In the rotation means 20 located in such a winding position P2, although the core core 2 is attached, nothing is wound around the core core 2 initially. In this state, first, as shown in Figs. 5A and 5B, the adhesive tape 51 made of PP is bonded to the surface of the core core 2 by the adhesive tape bonding means 42. do. As mentioned above, in this embodiment, the adhesive tape 51 of exactly one week length is bonded by the edge of the longitudinal direction 2 of the core core 2 at the edge.

Next, the heat welding means 43 is activated. At this time, a predetermined tension is applied to the two separators 3 and 4 extending from the previously wound battery element 1 positioned at the detachable position P1 at this time, and in this state, it is shown in FIG. As shown in the figure, the heater blocks 43a are moved so that the separators 3 and 4 are pressed against the core core 2 (it is pressed down). At this time, the adhesive tape 51 is bonded to the surface of the core core 2, and since the adhesive tape 51 and the separators 3 and 4 are comprised by mutually mutually same material, mutual welding ( Melted and mixed into one), and at the same time, thermal welding is performed. In this example, the adhesive tape 51 and the lower separator 3 are welded, and the upper separator 4 and the lower separator 3 are welded. As a result, the two separators 3 and 4 are fixed to the core core 2 at the same time.

Thereafter, as shown in Fig. 5D, the cutting means (cutter) 44 is operated so that the separators 3 and 4 are cut at once. In addition, at the time of this cutting | disconnection, as shown to the same figure, the rotating means 20 (winding core 21) is rotated by a predetermined angle. As a result, the separators 3 and 4 are bent in an acute shape, and cutting can be realized as the heat-welded portion is exactly at the tip by cutting the acute-shaped portion. In other words, the separators 3 and 4 can be fixed to the core core 2 with the ends of the separators 3 and 4 neatly arranged.

After that, in the winding position P2, the rotation means 20 (winding core 21) is rotated. And when the predetermined timing arrives, the positive electrode foil supply means 16 and the negative electrode foil supply means 17 are operated, and each electrode foil 5, 6 is supplied toward the core core 2 side. As a result, the positive electrode foil 5 and the negative electrode foil 6 are respectively wound in an insulated state via the separators 3 and 4, respectively. When the winding of the strip 7 is almost completed, the rotation means 20 of a little earlier is moved to the detachable position P1 by rotating the turret 12 counterclockwise. And the remaining separators 3 and 4 cut | disconnected by the cutting means 44 mentioned above are completely wound up, and a tape stop is performed and winding is completed. Thereafter, the core 21 is moved relatively in the direction away from the core 31, and the receiving pin 33 is pulled out of the fitting recess to form the joint 23. The holding force of the core core 2 is released. Next, the battery element 1 is obtained by removing the core core 2 in which the strip 7 is wound from the mounting portion 23 for each core core 2.

In addition, in the above example, in the case where the battery element 1 previously rolled up at the detachable position P1 already exists, thermal welding is performed in a state in which a predetermined tension is applied to the two separators 3 and 4 extending therefrom. This case will be described in detail. On the other hand, even when the battery element 1 previously wound in the detachable position P1 does not exist, predetermined tension is given to the separators 3 and 4 supplied by the separator supply means which are not shown in figure, and thermal welding is performed. By cutting off the excess separators 3 and 4, fixation similar to the above can be realized.

As described above in detail, according to the present embodiment, the adhesive tape 51 made of PP is bonded to at least a part of the surface of the core core 2. And by the heat welding means 43, it heat-welds simultaneously in the state which two sheets 3 and 4 overlapped with respect to the adhesive tape 51. FIG. Therefore, since two separators 3 and 4 can be fixed at the same time, it is not necessary to shift the end portions of the separator and fix them as in the prior art, and the complexity of the mechanism can be suppressed. Moreover, since it is not necessary to use a double-sided adhesive tape, increase of cost can be suppressed.

In addition, in this embodiment, since the separators 3 and 4 are to be fixed via the adhesive tape 51, it is not necessary to heat-weld the separator directly to the core core. Therefore, the raw material of the core core 2 is not limited at all, For example, metal materials, such as aluminum like this embodiment, etc. can also be used. In this sense, the material of the core core 2 can have a degree of freedom.

Moreover, in this embodiment, since the adhesive tape 51 of the length of one week is exactly bonded to the surface of the core core 2, the step by the presence or absence of the adhesive tape 51 in a circumferential direction Not formed. And since the strip | belt-shaped body 7 should just be wound up without being concerned about a step | step in this way, the quantity of the separators 3 and 4 used etc. can be suppressed to the minimum. As a result, the increase in cost can be suppressed and the battery element 1 can be made compact.

Moreover, in this embodiment, since the adhesive tape 51 is bonded to the both ends of the longitudinal direction of the core core 2, stable fixation of the separators 3 and 4 is aimed at, and the core core 2 Compared with the case where the surface is bonded to the entire surface of the surface, the amount of use of the adhesive tape 51 can be suppressed, and further increase in cost can be suppressed.

In addition, in this embodiment, the heater block 43a is moved by moving the heater block 43a in a state in which a predetermined tension is applied to the two separators 3 and 4 extending from the previously wound battery element 1 located at the detachable position P1. 3, 4) were to be thermally welded, and after the thermal welding, the separators 3 and 4 were cut at once by the cutting means 44. Therefore, the separators 3 and 4 are wound around the core core 2 in a state where the tips are arranged without aligning the leading edges of the separators 3 and 4 one by one, that is, without entailing difficulty. ) Can stick to. Therefore, the simplification in structure can be made remarkably. In addition, since the thermal welding is performed in a state where a predetermined tension is applied, there is no need to worry about meandering (squiggle, S-magnetization) or the like of the separators 3 and 4.

In addition, as the adhesive tape 51, since its melting temperature is the same as that of the separators 3 and 4, the incomplete welding by which one side does not melt can be prevented, and the separator 3, 4) can be more securely fixed. In particular, in this embodiment, since both are comprised by the same material, they are mutually compatible and can implement more firm fixation.

In addition, it is not limited to the description content of the said embodiment, For example, you may carry out as follows. Of course, other applications and modifications not exemplified below are naturally possible.

(a) In the said embodiment, although the structure which joins the adhesive tape 51 to the longitudinal direction both ends of the core core 2 is employ | adopted, it is not necessarily limited to such a structure. For example, as shown in FIG. 6B, the adhesive tape 51 may be bonded to the entire longitudinal direction of the core core 2. In addition, as shown in FIG. 6C, the adhesive tape 51 may also be bonded to the central portion in the longitudinal direction of the core core 2.

(b) In the said embodiment, although the adhesive tape 51 of the length of one week is exactly bonded to the surface of the core core 2, you may bond the adhesive tape 51 of one week or more, As shown in FIG. 6D, the adhesive tape 51 may be partially joined in a range not reaching the entire circumference.

(c) Although aluminum was illustrated as a raw material of the core core 2 in the said embodiment, you may comprise with other raw materials, for example, resin raw materials, such as PP.

(d) In the above embodiment, the insertion hole 8 of the core core 2 has a square cross section, and the mounting portion 23 has a square cross section, whereby the core 21 (mounting 23) Although the relative rotation of the core core 2 relative to)) is regulated, the cross-sectional shape of the insertion hole 8 and the mounting portion 23 of the core core 2 is not limited to the square shape in the cross section. For example, the cross section may have a polygonal shape such as a hexagonal shape, the cross section may have an oval shape, or the like.

(e) It goes without saying that the rotating means 20 in the said embodiment may use another structure as an example to the last. For example, although the receiving pin 33 is formed integrally with the support part 32 in the said example, the receiving pin 33 is provided separately from the support part 32, and the receiving pin 33 is provided. It is good also as a structure comprised so that the support part 32 can be moved (projected) along the axis C direction.

(f) In the said embodiment, although PP was illustrated as the raw material of the separators 3 and 4 and the raw material of the adhesive tape 51, other thermoplastic resin raw materials may be sufficient. For example, other polyolefin resin represented by polyethylene, polyester-based resin, such as polyethylene terephthalate, polyamide resin, etc. may be sufficient. In addition, both may not necessarily be the same material.

(g) In the said embodiment, the longitudinal direction length of the core core 2 and the width | variety (width of the strip | belt-shaped body 7) of the separators 3 and 4 and the positive electrode foils 5 and 6 are the same length. On the other hand, it is good also as winding the strip 7 to the core core 2 which is wider than the longitudinal direction length of the core core 2.

(h) In the said embodiment, although the battery element 1 of a lithium ion battery is manufactured by the winding apparatus 11, the winding element manufactured by the winding apparatus 11 is not limited to this, An example For example, you may manufacture the winding element of an electrolytic capacitor.

(i) In the said embodiment, although the adhesive tape 51 is demonstrated as one aspect of a coating layer, the surface of the core core is a thermoplastic resin material which softened or melted, or melt | dissolved in the predetermined solvent, for example. The resin coating layer provided by adhering to and solidifying may be specified as a coating layer.

BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional schematic diagram for demonstrating the structure of the battery element in 1 Embodiment;

2 is a schematic front view showing a winding device;

3 is a perspective view showing a rotating means and the like;

4 is a schematic front view showing a winding device in a state in which the turret is rotated halfway;

(A)-(d) is a cross-sectional schematic diagram which shows the fixing process of a separator,

FIG. 6A is a perspective view illustrating the core core and the adhesive tape in the present embodiment, and FIGS. 6B to 6D are perspective views illustrating the core core and the adhesive tape in another embodiment.

[Description of the code]

1: battery element as winding element, 2: core core, 3, 4: separator, 5: positive electrode foil, 6: negative electrode foil, 7: strip, 11: winding device, 16: plus electrode foil supply means, 17 : Negative electrode foil supply means, 20: rotation means, 21: winding core, 41: separator fixing means, 42: adhesive tape bonding means, 43: heat welding means, 44: cutting means, 51: adhesive tape, P1: detachable position, P2: winding position.

Claims (15)

Rotation means for allowing a cylindrical core to rotate about its axis, Separator fixing means for fixing two band-shaped thermoplastic resin separators to the core core; Electrode foil supply means for supplying a positive electrode foil and a negative electrode foil toward the core core side, respectively, After the two core separators are fixed to the core core, the positive electrode foil and the negative electrode foil are respectively passed through the separators while the core core is rotated based on the operation of the rotation means. As a winding device configured to be wound in an insulated state from each other, The separator fixing means, Coating layer applying means which provides a coating layer made of a thermoplastic resin with respect to at least one part of the surface of the said core core, Thermal welding means for thermal welding at the same time in the state where two sheets of the separator are laminated on the coating layer. Winding device comprising a. Rotation means for allowing the cylindrical core core to be rotatable about its axis, Separator fixing means for fixing two strip-shaped thermoplastic resin separators to the core core; Electrode foil supply means for supplying a positive electrode foil and a negative electrode foil toward the core core side, respectively, After the two core separators are fixed to the core core, the positive electrode foil and the negative electrode foil are respectively passed through the separators while the core core is rotated based on the operation of the rotation means. As a winding-up apparatus comprised so that it may wind up in mutually insulated state, The separator fixing means, Adhesive tape bonding means for bonding an adhesive tape made of thermoplastic resin to at least a part of the surface of the core core; Thermal welding means for thermal welding at the same time in the state where two sheets of the separator are laminated on the adhesive tape Winding device comprising a. The method of claim 2, The said adhesive tape joining means is the winding apparatus characterized by the joining of the adhesive tape of 1 week minute length exactly with respect to the surface of the said core core. The method of claim 2, The said adhesive tape joining means is the winding device which can join an adhesive tape at least in the longitudinal direction both ends of the said core core. The method according to any one of claims 1 to 4, The rotating means is provided with a rotating shaft which can be inserted into a insertion hole formed in the core core and is rotatably supported. The rotary shaft is provided in plurality in correspondence with a winding position for winding the separator and the positive electrode foil and a detachable position for attaching and detaching the core core. , Is configured to move between the two positions, The separator fixing means is provided corresponding to the winding position and is provided with cutting means capable of cutting the separator. The thermal welding means is capable of thermal welding two separators extending from the detachable position with a predetermined tension. The said cutting means cut | disconnects the said separator at once two times after the said heat welding, The winding apparatus characterized by the above-mentioned. As the wound element wound around the core core, the positive electrode foil and the negative electrode foil were insulated from each other through two strips of a band-shaped thermoplastic resin, At least a part of the surface of the core core is provided with a coating layer made of a thermoplastic resin, The wound element is heat-welded in the state in which 2 sheets of said separators overlapped with respect to the said coating layer. As a winding element which wound the positive electrode foil and the negative electrode foil with respect to the core core in the insulated state with each other via the strip | belt-shaped 2 sheets of thermoplastic resin separator, An adhesive tape made of a thermoplastic resin is bonded to at least a part of the surface of the core core, The winding element with respect to the said adhesive tape is heat-welded in the state in which 2 sheets of said separators overlapped. The method according to claim 6 or 7, The winding core is made of a material other than a thermoplastic resin. The method according to claim 6 or 7, A winding element characterized by leading edges of two separators arranged on the innermost side. The method of claim 7, wherein The melting element of the said adhesive tape is equivalent to the melting temperature of the said separator, The winding element characterized by the above-mentioned. The core core, the positive electrode foil, and the separator are wound around the core core rotatably provided by winding the positive electrode foil and the negative electrode foil in an insulated state through two strip-shaped thermoplastic resin separators. As a manufacturing method of the wound element for manufacturing the wound element which consists of: A coating layer applying step of providing a coating layer made of a thermoplastic resin to at least a part of the surface of the core core; A heat welding step of thermal welding at the same time in the state where two sheets of the separator are laminated on the coating layer. And, And after the separator is fixed to the core core by the thermal welding, the winding of the plus electrode foil and the minus electrode foil is started. The method of claim 11, The melting layer is the same as the melting temperature of the separator as the coating layer, characterized in that the manufacturing method of the wound element. The core core, the positive electrode foil, and the separator are wound around the core core rotatably provided by winding the positive electrode foil and the negative electrode foil in an insulated state through two strip-shaped thermoplastic resin separators. As a manufacturing method of the wound element for manufacturing the wound element which consists of: An adhesive tape bonding step of bonding an adhesive tape made of thermoplastic resin to at least a part of the surface of the core core; A heat welding step of thermal welding at the same time in the state where two sheets of the separator are laminated on the adhesive tape. And, And after the separator is fixed to the core core by the thermal welding, the winding of the plus electrode foil and the minus electrode foil is started. The method of claim 13, The adhesive tape WHEREIN: The manufacturing method of the winding element characterized by using the thing whose melting temperature is equal to the melting temperature of the said separator. The method according to any one of claims 11 to 14, In the thermal welding step, the two separators extending from the previously wound winding element are thermally welded in a state in which a predetermined tension is applied, and then the separators are cut in two at a time. Method of manufacturing the device.

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