JP7217495B2 - Electrode material winding device without separator - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrode material winding apparatus that does not use a separator, and more particularly to a winding apparatus for manufacturing a wound body for use in a secondary battery or the like from a newly developed electrode sheet.

Conventionally, a strip-shaped positive electrode material coated with an active material and two separators made of a strip-shaped insulator between a negative electrode material are alternately superimposed and insulated, and wound around a winding core. A secondary battery or the like is manufactured by immersing the wound body in an electrolytic solution.

As shown in FIG. 10, a winding apparatus 100 for manufacturing this wound body includes a raw material 104 wound with a positive electrode material 102, a raw material 108 wound with a separator 106, and a negative electrode material 110. A wound raw material 112 and a raw material 116 wound with a separator 114 are arranged at predetermined positions, respectively, and a rotating disk 118 is arranged to rotate about its own central axis. The rotating disk 118 has three winding cores 120 arranged at equal intervals in its circumferential direction. The winding core 120 is configured to slide in the direction of the rotation axis of the rotary disc 118, to protrude from the rotary disc 118, and to rotate about the respective axes. Reference numeral 124 denotes a raw roll around which an adhesive tape 122 is wound for fixing the ends of the separators 106 and 114 wound around the winding core 120 .

In such a configuration, the separators 106 and 114 drawn out from the original sheets 108 and 116 are superimposed and sent to the core 120 via the roller 126, and the leading ends of the separators 106 and 114 are brought to the core 120 at position S1. It is sandwiched between the provided slits. After the separators 106 and 114 are wound around the roll core 120, the tip of the strip-shaped positive electrode material 102 drawn out from the roll 104 is sandwiched between the roll core 120 and the separator 106, and the strip-shaped negative electrode drawn out from the roll 112 is sandwiched between the roll core 120 and the separator 106. The tip of the electrode material 110 is sandwiched between the separator 106 and the separator 114 , and the laminate of the positive electrode material 102 , the separator 106 , the negative electrode material 110 and the separator 114 is wound around the winding core 120 . While winding these laminates around the winding core 120, the turntable 118 is rotated from position S1 to position S2. When a predetermined length is wound, the positive electrode material 102 and the negative electrode material 110 are cut, The separators 106 and 114 are cut at the same time so as to sufficiently cover the cut ends of the electrode material 102 and the negative electrode material 110 . Subsequently, the adhesive tape 122 is joined so as to cover at least the cut ends of the separators 106 and 114 to produce a wound body 128 . The obtained wound body 128 rotates the rotating disk 118, pulls down the winding core 120 from the surface of the rotating disk 118 at position S3, extracts the winding core 120 from the wound body 128, and takes out the wound body 128.

By repeating the above operations, the wound body 128 is manufactured. At the start and end of winding 110, it plays an important role such as preventing short circuits and misalignment at the end of the electrode and supporting the electrode material.

In secondary batteries, the narrower the distance between the electrodes, the higher the input/output and capacity at the same time. A secondary battery was developed and proposed (Non-Patent Document 1). This secondary battery does not require a separator, and is expected to provide a compact battery with a large capacity.

Toshiba press release http://engineer.fabcross.jp/archeive/180605_toshiba.html http://www.toshiba.co.jp/about/press/2018_06/pr_j0401.htm

However, no proposal has been made as to how to wind the electrode material to form a wound body without using a separator. That is, the separator also plays a role of supporting and guiding the positive electrode material and the negative electrode material during manufacturing of the wound body. It is necessary to cut the positive electrode material and the negative electrode material when continuously producing the wound body, but if there is no separator, the ends of the positive electrode sheet and the negative electrode sheet covered with the nanofiber film will hang down, etc. As a result, the edge cannot be positioned, and there is a risk of misalignment. In addition, there was no winding device for manufacturing a wound body by winding an electrode material without using a separator, because there was no raw material.

In view of the above-described problems, an object of the present invention is to provide a positive electrode sheet and a negative electrode sheet at the beginning and end of winding when manufacturing a wound body by winding an electrode material without using a separator. To provide a winding device which prevents an end from being dislocated.

In order to solve the above-described problems, the first invention provides a wound body obtained by overlapping and winding a belt-shaped positive electrode sheet and a negative electrode sheet, each having an insulating coating formed on one or both sides thereof. A winding device for manufacturing a
A core at a winding start position, a core at a winding end position, a moving means for moving the core at the winding start position to the winding end position, and a core at both positions are connected. a first gripping device that grips either the strip-shaped positive electrode sheet or the negative electrode sheet and moves in parallel from the winding end position to the winding core side at the winding start position; and a cutting device disposed between the winding core at the winding end position.

In order to solve such problems, the second invention provides a strip-shaped positive electrode sheet and a strip-shaped negative electrode sheet having an insulating film formed on one or both sides of either one or both of them, and then winding them together. A winding device for manufacturing a body,
A core at a winding start position, a core at a winding end position, a moving means for moving the core at the winding start position to the winding end position, and a core at both positions are connected. a second gripping device that grips either the strip-shaped positive electrode sheet or the negative electrode sheet and moves in parallel from the winding start position to the winding core side at the winding end position; and a cutting device disposed between the winding core located at the winding start position.

Furthermore, in order to solve such a problem, the third invention provides a strip-shaped positive electrode sheet and a strip-shaped negative electrode sheet having an insulating film formed on one or both sides of either one or both of them. A winding device for manufacturing a body,
A core at a winding start position, a core at a winding end position, a moving means for moving the core at the winding start position to the winding end position, and a core at both positions are connected. A first gripping device that grips either a belt-shaped positive electrode sheet or a negative electrode sheet and moves in parallel to the winding core side at the winding start position; A moving second gripping device and a cutting device disposed between the first gripping device and the second gripping device are provided.

In the first to third inventions, the insulating coating is not electrically short-circuited and has a gap through which ions can easily pass; a gripping roller for holding an end of the positive electrode sheet or the negative electrode sheet; It is provided with an adhesive tape for fixing the circumference of the winding body.

According to the winding device according to the first aspect of the present invention, the positive electrode sheet or the negative electrode sheet extending from the wound body wound on the winding core at the winding end position is first gripped in the vicinity of the winding core. It is gripped by a device and cut by a cutting device. Since the cut end portion of the positive electrode sheet or the negative electrode sheet extending from the winding body wound on the winding end position is short, when the winding core at the winding end position is rotated, the position is displaced. It is wound on the winding body without causing On the other hand, the cut ends of the positive electrode sheet or the negative electrode sheet extending from the winding core at the winding start position are long, but since they are gripped by the first gripping device, they do not hang down. is returned to the winding start position, the core is wound on the winding core at the winding start position without positional deviation.

In addition, by starting winding one of the positive electrode sheet or the negative electrode sheet coated with the insulating coating and ending the winding, the cut end of the other electrode sheet is covered with the insulating coating, so that a short circuit is not caused. does not occur.

According to the winding device according to the second aspect of the present invention, the positive electrode sheet or the negative electrode sheet extending from the wound body wound on the winding core at the winding end position to the winding core at the winding start position is wound. The core is gripped by the second gripping device near the core at the starting position, and cut by the cutting device. The cut ends of the positive electrode sheet or the negative electrode sheet extending from the core at the winding start position are short and are gripped by the slits of the core. does not occur. On the other hand, although the cut end of the positive electrode sheet or the negative electrode sheet extending from the roll wound on the core at the winding end position is long, it is gripped by the second gripping device, so it does not hang down. Instead, by rotating the core at the winding end position, the second gripping device can be pulled to the winding end position, and the wound body can be wound without positional deviation.

In addition, by starting winding one of the positive electrode sheet or the negative electrode sheet coated with the insulating coating and ending the winding, the cut end of the other electrode sheet is covered with the insulating coating, so that a short circuit is not caused. does not occur.

According to the winding device according to the third aspect of the present invention, the positive electrode sheet or the negative electrode sheet extending from the wound body wound on the winding core at the winding end position to the winding core at the winding start position is The intermediate portion is gripped by the gripping device and the second gripping device. When the positive electrode sheet or the negative electrode sheet is cut by the cutting device provided between the first gripping device and the second gripping device, the two cut ends are gripped by the first gripping device and the second gripping device, respectively. so it doesn't hang down. The cut ends gripped by the first gripping device and the second gripping device are moved to the winding start position and the winding end position, respectively, as described above. , and the other is wound on the winding core at the winding end position.

In addition, by starting winding one of the positive electrode sheet or the negative electrode sheet coated with the insulating coating and ending the winding, the cut end of the other electrode sheet is covered with the insulating coating, so that a short circuit is not caused. does not occur.

It is a front view showing a winding device concerning the present invention. FIG. 3 is a diagram showing a positive electrode sheet and a negative electrode sheet used in the winding device according to the present invention, where (a) and (b) are plan views of different embodiments, (c), (d) and (e). ) are cross-sectional views of different embodiments. It is a front view which shows the principal part of the winding device which concerns on this invention. 1A to 1E are front views for explaining the operation of the winding device according to the present invention. 4(a) to 4(d) are front views for explaining the operation of the winding device shown in FIG. FIG. 10 is a front view showing the main part of another winding device according to the present invention; 6A to 6D are front views for explaining the operation of the winding device shown in FIG. FIG. 11 is a front view showing the main part of still another winding device according to the present invention; 8A to 8D are front views for explaining the operation of the winding device shown in FIG. It is a front view which shows the conventional winding apparatus.

As shown in FIG. 1, the winding device 10 according to the present invention comprises a work panel 12 erected in a vertical direction, a raw material 16 obtained by winding a strip-shaped positive electrode sheet 14 into a roll, and a strip-shaped positive electrode sheet 14 . An original sheet 20 in which a negative electrode sheet 18 is wound into a roll, an original sheet 24 in which a band-shaped adhesive tape 22 is wound into a roll, and the positive electrode sheet 14, the negative electrode sheet 18, and the adhesive tape 22. A turntable 28 with which the wound body 26 is produced is arranged at a predetermined position.

As shown in FIG. 2, the positive electrode sheet 14 and the negative electrode sheet 18 are made of an electrode material 30 formed by processing a thin plate made of metal such as aluminum or copper into a sheet shape. An insulating coating 32 is formed on the surface of the electrode material 30 made of these metal sheets. The insulating coating 32 has different characteristics depending on the application of the manufactured wound body 26 . For example, when the wound body 26 is used for a capacitor or the like, the insulating coating 32 may be made of a material that functions as a dielectric.

Alternatively, when the wound body 26 is used in a secondary battery or the like, the insulating coating 32 may have a structure that does not cause an electrical short circuit and has gaps that allow ions to easily pass through. It is desirable that the insulating coating 32 have heat resistance, and it is only necessary that the insulating coating 32 is a film through which ions can easily pass in the electrolytic solution while maintaining insulation. This is because when the wound body 26 is used in a secondary battery or the like, it may be exposed to high temperatures, and even in such a case, it is necessary to maintain insulation. Moreover, it is desirable that the insulating coating 32 has toughness so that the coating is not easily broken or crushed by external force. Furthermore, the insulating coating 32 is required to be immersed in the electrolytic solution and made of a material that can withstand long-term use.

The insulating coating 32 having the above properties is specifically realized as follows. The insulating coating 32 is formed, for example, in the form of a nonwoven fabric or a porous form, and the concept of the porous form also includes the form of a woven fabric, for example. The non-woven insulating coating 32 is preferably formed of a nanofiber film, as shown in FIG. 2(a). The nanofiber film is formed on the surface of the electrode material 30 using, for example, an electrospinning technique in which a polymer solution is spun by applying a high voltage. The porous insulating coating 32 uses two kinds of incompatible resins, and after spraying a soluble resin in the form of a mist onto the surface of the electrode material 30 to adhere it in dots, another insoluble resin is applied. By applying a resin and then removing only the dot-shaped resin with a solvent, an insulating resin film with dot-shaped voids is formed. Alternatively, the porous insulating coating 32 may be formed on the surface of the electrode material 30 by using an insulating resin and forming a foamed resin coating consisting of fine continuous spaces. Alternatively, as shown in FIG. 2(b), the porous insulating coating 32 can be formed by adhering a mesh material formed of ultrafine resin wires to the surface of the electrode material 30. be. All of these are included in the concept of the porous insulating coating 32 in this specification. When the positive electrode sheet 14 and the negative electrode sheet 18 are superimposed and wound into a roll, the electrode materials 30 are in direct contact with each other, and the insulating coating 32 has such a thickness and density as not to cause an electrical short circuit. In addition, it is sufficient if the structure has gaps through which ions in the electrolytic solution can easily pass when immersed in the electrolytic solution. It is also possible to provide a non-woven fabric insulating coating on one side of the electrode material 30 and provide a porous insulating coating on the other side.

These non-woven fabric or porous insulating coatings 32 may be formed on the surface of a wide electrode material 30, slit to an appropriate width, and used as the positive electrode sheet 14 or the negative electrode sheet 18. A non-woven fabric or porous insulating coating 32 may be formed on the surface of the electrode material 30 formed in a wide width. The nonwoven or porous insulating coating 32 may be formed on one surface of the electrode material 30 as shown in FIG. 2(c), or may be formed on both surfaces as shown in FIG. 2(d). Also good. An electrode material 30 having an insulating film 32 formed on one surface or both surfaces thereof is referred to as a positive electrode sheet 14 or a negative electrode sheet 18 in this specification. In addition, as shown in FIG. 2E, a combination of an electrode material 30 having insulating coatings 32 formed on both sides thereof and an electrode material 30 having no insulating coatings 32 may be used. The positive electrode sheet 14 and the negative electrode sheet 18 are sent to the turntable 28 while applying a constant tension from the raw sheets 16 and 20, respectively.

As shown in FIG. 1, the turntable 28 is pivotally supported by the work panel 12 so as to be rotated every 120 degrees around its own rotation axis by a servomotor (not shown) or the like. The rotating disk 28 is provided with winding cores 34 at three locations in the circumferential direction. The core 34 is configured to be slidable in a direction perpendicular to the rotating disk 28, that is, in the direction of the rotation axis of the rotating disk 28, and to be rotated about the axis of the core 34 itself. The winding core 34 is provided with a slit 36 in its axial direction (see FIG. 3) on the side where the winding core 34 protrudes from the rotating disk 28, and sandwiches the positive electrode sheet 14 or the negative electrode sheet 18. configured to be able to

Of the winding cores 34 provided at three locations in the circumferential direction of the rotating disk 28, the winding core 34 located at the position where the positive electrode sheet 14 and the negative electrode sheet 18 are fed via rollers 38 is at the winding start position S1. , the winding core 34 at the position where the adhesive tape 22 is wound is at the winding end position S2, and the winding core 34 at the position where the wound body 26 wound on the winding core 34 is extracted from the winding core 34 is at the withdrawal position S3. It is in. By rotating the turntable 28 and moving the position of the winding core 34 from S1 to S2 and from S2 to S3, different work is performed at each position, and by moving from S3 to S1, a new winding core is moved. 34 is configured to wind the wound body 26 thereon.

Between the winding start position S1 and the winding end position S2 of the winding core 34 and in the vicinity of the winding end position S2, as shown in FIG. A cutting device 42 is arranged between the first gripping device 40 and the winding end position S2. The first gripping device 40 and the cutting device 42 are normally retracted inside the rotating disc 28 and are configured to come out in front of the rotating disc 28 just before use. The first gripping device 40 stretches the positive electrode sheet 14 or the negative electrode sheet 18 wound on the winding core 34 at the winding end position S2 through the slit 36 of the winding core 34 at the winding start position S1. It is configured so that it can move in parallel along the line being passed. The first gripping device 40 is configured to move, for example, on rails (not shown) against a certain sliding resistance. Further, a gripping roller 44 protrudes from the inside of the rotating disk 28 in the vicinity of the core 34 at the winding end position S2, and the core 34 at the winding end position S2 is positioned between the gripping roller 44 and the core 34. The positive electrode sheet 14 or the negative electrode sheet 18 wound up is gripped. The first gripping device 40 grips the positive electrode sheet 14 or the negative electrode sheet 18 using urging means such as air pressure or spring force, and the winding core 34 at the winding end position S2 and the first gripping device 40 are separated from each other. The intermediate positive electrode sheet 14 or negative electrode sheet 18 is cut by the cutting device 42 .

One end of the positive electrode sheet 14 or the negative electrode sheet 18 on the side of the winding core 34 at the winding end position S2 cut by the cutting device 42 is gripped by a gripping roller 44, and is cut from the winding core 34 side at the winding start position S1. One end of the positive electrode sheet 14 or the negative electrode sheet 18 is gripped by the first gripping device 40 . The positive electrode sheet 14 or the negative electrode sheet 18 gripped by the first gripping device 40 is moved to the winding core 34 at the winding start position S1 by the action of a tension roller or the like between the rolls 16, 20 and the roller 36. It is configured to be drawn to the side. The first gripping device 40 pulled toward the winding start position S1 along with this operation holds the leading edge of the positive electrode sheet 14 or the negative electrode sheet 18 in the slit 36 of the winding core 34 at that position. By releasing the gripping of the gripping device 40, it is moved to the winding end position S2 side along a rail (not shown). The first gripping device 40 may be moved by a spring force, or by a driving force such as a motor. The first gripping device 40 moved to the winding end position S2 side is housed inside the rotating disk 28 .

An example of the operation of the winding device 10 having the above configuration will be described. First, the negative electrode sheet 18 coated with the insulating coating 32 by a nanofiber film or the like is unwound from the roll 20, and as shown in FIG. The tip is inserted into the slit 36 of the . This initial winding start operation may be performed by an operator, or may be configured so as to be performed automatically. After rotating the winding core 34 about one turn and winding the negative electrode sheet 18 around the winding core 34, as shown in FIG. The tip is sandwiched between the winding core 34 and the negative electrode sheet 18 . Then, the negative electrode sheet 18 and the positive electrode sheet 16 are overlapped and wound up, and the positive electrode sheet 16 and the negative electrode sheet 18 are wound around the winding core 34 by a predetermined length. After that, the positive electrode sheet 16 is cut by the second cutting device 46 . The cut positive electrode sheet 16 is rolled up so as to be sandwiched between the negative electrode sheets 18 , and the electrode surfaces exposed at the cut end surfaces of the positive electrode sheet 16 are covered with the insulating coating 32 of the negative electrode sheet 18 .

After that, the turntable 28 is rotated to move the winding core 34 from the winding start position S1 to the winding end position S2 as shown in FIG. Next, as shown in FIG. 4(d), after the supporting piece 48 is protruded from the inside of the rotating disk 28, the supporting piece 48 is lifted upward, and the negative electrode sheet 18 between the supporting piece 48 and the roller 38 is removed. Make it in a certain direction, for example horizontal. That is, the fixed direction of the negative electrode sheet 18 adjusted by the support piece 48 is the direction that intersects the axis of the winding core 34 at the winding start position S1. When the negative electrode sheet 18 between the supporting piece 48 and the roller 38 is oriented in a certain direction, a new winding core 34 is placed at the winding start position S1 of the turntable 28, as shown in FIG. It protrudes from the rotating disk 28. - 特許庁Since the direction of the slit 36 of the winding core 34 is oriented in a fixed direction, the negative electrode sheet 18 is inserted into the slit 36 . After the negative electrode sheet 18 is inserted into the slit 36 of the winding core 34 at the winding start position S1, the support piece 48 is lowered to separate the winding core 34 at the winding start position S1 and the winding core at the winding end position S2. The negative electrode sheet 18 between 34 is stretched straight.

Next, as shown in FIG. 5A, the first gripping device 40 protrudes from the inside of the rotating disk 28 in the vicinity of the winding end position S2, grips both surfaces of the negative electrode sheet 18, and then grips the negative electrode sheet 18. do. Next, as shown in FIG. 5(b), a gripping roller 44 is protruded from the inside of the rotating disk 28 in the vicinity of the winding core 34 at the winding start position S1, and the gripping roller 44 and the winding core 34 are interposed between the gripping roller 44 and the core 34. The negative electrode sheet 18 wound around the winding core 34 at the winding end position S2 is gripped. At the same time, the cutting device 42 is caused to protrude from the inside of the rotating disk 28 between the winding core 34 at the winding end position S2 and the first gripping device 40 to cut the negative electrode sheet 18 .

As shown in FIG. 5(c), one end of the cut negative electrode sheet 18 is wound by rotating the winding core 34 at the winding end position S2, and the other end is wound by the first gripping device 40. is moved to the winding core 34 side of the winding start position S1. Then, as shown in FIG. 4(d), the first gripping device 40 is brought closer to the winding core 34 at the winding start position S1, and the end of the negative electrode sheet 18 is gripped by the slit 36 of the winding core 34. After that, the gripping by the first gripping device 40 is released. The first gripping device 40 is then retracted inside the turntable 28 . As shown in FIG. 1, the laminate of the positive electrode sheet 14 and the negative electrode sheet 18 wound around the winding core 34 at the winding end position S2 is fixed by wrapping an adhesive tape 22 around it. The wound body 26 is completed.

At the winding core 34 at the winding start position S1, the winding operation of the negative electrode sheet 18 and the positive electrode sheet 14 is in progress as described above, and the winding core 34, on which the rotating disk 28 is rotated, is at the winding start position. It is moved from S1 to the winding end position S2. Along with this rotation, the wound body 26 that has been wound around the core 34 at the winding end position S2 is moved to the removal position S3, and the core 34 is removed from the wound body 26 at this position.

By the above operation, the wound body 26 is continuously manufactured. The wound body 26 is first wound around the winding core 34 with the negative electrode sheet 18 having the insulating coating 32 formed on both sides or one side. After that, since the positive electrode sheet 14 having the insulating coating 32 formed on both sides or one side is wound, the ends of the positive electrode sheet 14 are covered with the negative electrode sheet 18, and the two are not short-circuited. No misalignment occurs. Further, in the present embodiment, the first gripping device 40 grips the negative electrode sheet 18 in the vicinity of the winding end position S2, and the cutting device 42 cuts it. does not occur. Further, the first gripping device 40 grips the cut end of the negative electrode sheet 18 and moves to the winding start position S1, and the tip of the negative electrode sheet 18, that is, the winding start, is moved to the winding core 34 at the winding start position S1. Since the negative electrode sheet 18 is gripped at a portion thereof, the position of the negative electrode sheet 18 on the winding core 34 at the winding start position S1 does not shift.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. Note that common numbers are assigned to common parts, and descriptions thereof are omitted. As shown in FIG. 6, a second gripping device 50 is disposed between the winding core 34 at the winding start position S1 and the winding core 34 at the winding end position S2. A configuration in which a cutting device 42 is disposed between the winding core 34 at the position S1 may be employed. Both the second gripping device 50 and the cutting device 42 are arranged in the vicinity of the winding core 34 at the winding start position S1. A laminate of the positive electrode sheet 14 and the negative electrode sheet 18 is wound around the winding core 34 at the winding end position S2. (This has been explained in detail in the explanation of the operation of the above embodiment.). The second gripping device 50 is configured to move in parallel along the negative electrode sheet 18 extending from the winding core 34 at the winding end position S2 to the slit 36 of the winding core 34 at the winding start position S1. . The second gripping device 50, like the first gripping device 40 described above, is configured to move on a rail (not shown) against a certain sliding resistance, and grips the cut end of the negative electrode sheet 18. As the negative electrode sheet 18 is wound up by the winding core 34 at the winding end position S2, the second gripping device 50 is drawn along with it. Other configurations of the second gripping device 50 are the same as those of the first gripping device 40 .

First, as described for the first gripping device 40 (see FIG. 4E), after the negative electrode sheet 18 is inserted into the slit 36 of the winding core 34 at the winding start position S1, the support piece 48 is lowered downwards. In a state in which the negative electrode sheet 18 between the winding core 34 at the winding start position S1 and the winding core 34 at the winding end position S2 is linearly stretched, as shown in FIG. The device 50 is protruded from the turntable 28 in the vicinity of the winding core 34 at the winding start position S1. After sandwiching the negative electrode sheet 18, the second gripping device 50 grips it by air pressure or the like. The negative electrode sheet 18 inserted into the slit 36 of the winding core 34 at the winding start position S<b>1 is gripped by the slit 36 .

Next, as shown in FIG. 7B, the cutting device 42 is protruded from inside the turntable 28 between the winding core 34 at the winding start position S1 and the second gripping device 50 to cut the negative electrode sheet 18. do. The cut edge of the negative electrode sheet 18 is gripped by the second gripping device 50 and does not hang down. At this time, as shown in FIG. 7(c), the winding core 34 at the winding end position S2 is rotated, and the second gripping device 50 grips the cut end of the negative electrode sheet 18 and moves to the winding end position. It is pulled up to the vicinity of the winding core 34 of S2. When the second gripping device 50 is drawn near the winding core 34 at the winding end position S2, as shown in FIG. It is brought in contact with the negative electrode sheet 18 on the winding core 34 side, and grips the end of the negative electrode sheet 18 . After the negative electrode sheet 18 is wound by rotating the winding core 34 at the winding end position S2 at the same time as releasing the gripping by the second gripping device 50, as shown in FIG. A winding body 26 is produced by fixing. On the other hand, the negative electrode sheet 18 gripped by the slit 36 of the winding core 34 at the winding start position S1 is wound by rotating the winding core 34 by about one turn. It is inserted between the negative electrode sheets 18 and the laminate of the negative electrode sheet 18 and the positive electrode sheet 14 is wound. The following are as described above.

In this embodiment, since the negative electrode sheet 18 is cut in the vicinity of the core 34 at the winding start position S1, the negative electrode sheet 18 is gripped by the slit 36 of the core 34 at the winding start position S1. does not cause misalignment. The other end cut near the core 34 at the winding start position S1, that is, the end of the negative electrode sheet 18 extending from the core 34 side at the winding end position S2 is held by the second gripping device 50. Since the negative electrode sheet 18 is moved to the winding end position S2 while being held by the negative electrode sheet 18, the position of the winding end portion of the negative electrode sheet 18 is not displaced.

Next, another embodiment of the present invention will be described. The description of the parts common to the above-described embodiment will be omitted. As shown in FIG. 8, a first gripping device 40 and a second gripping device 50 are arranged between the winding core 34 at the winding start position S1 and the winding core 34 at the winding end position S2. A configuration in which a cutting device 42 is arranged between the device 40 and the second gripping device 50 may be employed. It is preferable that the first gripping device 40 and the second gripping device 50 are arranged in a substantially intermediate portion between the winding start position S1 and the winding end position S2, but this is not a limitation. A laminate of the positive electrode sheet 14 and the negative electrode sheet 18 is wound around the winding core 34 at the winding end position S2. Only the negative electrode sheet 18 passes through the slit 36 of the winding core 34 at the winding start position S1 (as described in detail in the explanation of the operation of the above embodiment).

The first gripping device 40 and the second gripping device 50 move in parallel along the negative electrode sheet 18 extending between the slits 36 of the core 34 at the winding end position S2 and the winding start position S1. The first gripping device 40 is moved in the direction of the winding start position S1, and the second gripping device 50 is moved in the direction of the winding end position S2. Both the first gripping device 40 and the second gripping device 50 are configured to move on a rail (not shown) against a certain sliding resistance, and grip one of the cut ends of the negative electrode sheet 18. The first gripping device 40 pulls the negative electrode sheet 18 back toward the raw material 20 by the action of a tension roller or the like that applies a constant tension to the negative electrode sheet 18, thereby pulling the negative electrode sheet 18 toward the winding start position S1 and cutting the other side. The second gripping device 50 that grips the end portion is drawn to the winding end position S2 by winding the negative electrode sheet 18 with the winding core 34 at the winding end position S2.

First, as described with reference to FIG. 4(e), after the negative electrode sheet 18 is inserted into the slit 36 of the core 34 at the winding start position S1, the support piece 48 is lowered to the winding start position S1. The negative electrode sheet 18 between the core 34 at the winding end position S2 and the core 34 at the winding end position S2 is linearly stretched. Therefore, as shown in FIG. 9(a), the first gripping device 40 and the second gripping device 50 are protruded from the rotating disk 28 in the intermediate portion between the winding start position S1 and the winding end position S2. After sandwiching the negative electrode sheet 18 between the first gripping device 40 and the second gripping device 50, the negative electrode sheet 18 is gripped by air pressure or the like.

Next, as shown in FIG. 9B, the cutting device 42 is protruded from the inside of the rotating disk 28 between the first gripping device 40 and the second gripping device 50 to cut the negative electrode sheet 18 . The cut ends of the negative electrode sheet 18 are gripped by the first gripping device 40 and the second gripping device 50, respectively, and do not hang down. At this time, as shown in FIG. 9(c), the first gripping device 40 grips one end of the negative electrode sheet 18 whose tension is no longer applied due to the cutting, and the negative electrode sheet 18 is pulled back by the action of a tension roller or the like. As a result, it is drawn near the winding core 34 at the winding start position S1. On the other hand, the winding core 34 at the winding end position S2 is rotated, and the second gripping device 50 is drawn to the vicinity of the winding core 34 at the winding end position S2 while gripping the cut end of the negative electrode sheet 18. .

When the second gripping device 50 is drawn near the winding core 34 at the winding end position S2, as shown in FIG. It is brought in contact with the negative electrode sheet 18 on the winding core 34 side, and grips the end of the negative electrode sheet 18 . After the negative electrode sheet 18 is wound by rotating the winding core 34 at the winding end position S2 at the same time as releasing the gripping by the second gripping device 50, as shown in FIG. are fixed to manufacture the wound body 26 . On the other hand, the negative electrode sheet 18 gripped by the first gripping device 40 is gripped by the slit 36 of the winding core 34 at the winding start position S1, and then the gripping by the first gripping device 40 is released. Then, the winding core 34 at the winding start position S1 is rotated about one turn to wind the negative electrode sheet 18 around the winding core 34, and then the positive electrode sheet 14 is inserted between the winding core 34 and the negative electrode sheet 18. , the laminate of the negative electrode sheet 18 and the positive electrode sheet 14 is wound. The following are as described above.

In the present embodiment, the first gripping device 40 and the second gripping device 50 grip the middle portion between the winding start position S1 and the winding end position S2 of the negative electrode sheet 18, respectively. A cutting device 42 cuts between the gripping devices 50 . Therefore, none of the cut negative electrode sheets 18 sag. The end portion of the negative electrode sheet 18 extending from the winding core 34 at the winding start position S1 is gripped by the first gripping device 40, and the original fabric 20 side of the negative electrode sheet 18 is provided with a tension roller or the like for applying a constant tension. , a force is exerted to pull it back toward the original fabric 20 side. As a result, the first gripping device 40 is pulled back toward the winding start position S1, and the cut end of the negative electrode sheet 18 is gripped by the slit 36 of the winding core 34 at that point. On the other hand, the end portion of the negative electrode sheet 18 extending from the winding end position S2 on the winding core 34 side is gripped by the second gripping device 50, and the winding core 34 is rotated to wind up the negative electrode sheet 18. As a result, the second gripping device 50 is moved to the winding end position S2, and the wound body 26 is wound by releasing the gripping. Therefore, the cut ends of the negative electrode sheet 18 are not displaced at the winding start position S1 and the winding end position S2. Moreover, the positive electrode sheet 14 is covered with the insulating film of the negative electrode sheet 18 at both the start and the end of winding of the wound body 26, so that there is no short circuit.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the positive electrode sheet 14 is covered with the negative electrode sheet 18, but the reverse is also possible. In this case, the arrangement of the positive electrode sheet 14 and its original sheet 16 is replaced with the arrangement of the negative electrode sheet 18 and its original sheet 20 .

The first gripping device 40, the second gripping device 50, and the cutting device 42 are configured to emerge from the inside of the turntable 28. Specifically, they are arranged on the work panel 12, and the first gripping device 40 and A second gripping device 50 is configured to move in and out of the work panel 12 including the rails on which it is moved. The turntable 28 is provided with openings so that the first gripping device 40 and the second gripping device 50 can move along the rails. It is preferable to configure the cutting device 42 so that it can be individually moved in and out of the work panel 12 in the same manner as the first gripping device 40 and the second gripping device 50 . It is also possible to fix to and move integrally with them.

While the rotating disk 28 is rotated about its own axis, it is most efficient because a series of winding body manufacturing processes can be sequentially performed. As a moving means for moving to the winding end position S2, for example, it is possible to constitute a swinging device. Specifically, the winding is started at the winding core 34 at the winding start position S1, and the winding is finished at the winding end position S2. The winding core 34 is returned to the winding start position S1. It is possible to reduce the number of components of the moving means.

In the above-described embodiments, the winding core has a circular cross section, but the core is not limited to this, and the shape can be elliptical, elliptical, or the like depending on the application.

In addition, the present invention can be implemented in various forms with various improvements, modifications or variations based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, any invention specifying matter may be replaced with another technique within the scope of producing the same action or effect.

10: Winding device 12: Work panel 14: Positive electrode sheets 16, 20, 24: Original fabric 18: Negative electrode sheet 22: Adhesive tape 26: Winding body 28: Rotating plate (moving means)
30: Electrode material 32: Insulating coating 34: Winding core 36: Slit 40: First gripping device 42: Cutting device 44: Gripping roller 50: Second gripping device S1: Winding start position S2: Winding end position

Claims (7)

A winding device for manufacturing a wound body by overlapping and winding a belt-shaped positive electrode sheet and a negative electrode sheet having an insulating film formed on one or both of one or both sides,
a winding core at a winding start position;
a winding core at the winding end position;
moving means for moving the winding core at the winding start position to the winding end position;
A first gripping member that grips either the strip-shaped positive electrode sheet or the negative electrode sheet that connects the winding cores at both positions and moves in parallel from the winding end position to the winding core side at the winding start position. a device;
A winding device for electrode material that does not use a separator and is provided with a cutting device disposed between the first gripping device and the winding core at the winding end position. A winding device for manufacturing a wound body by overlapping and winding a belt-shaped positive electrode sheet and a negative electrode sheet having an insulating film formed on one or both of one or both sides,
a winding core at a winding start position;
a winding core at the winding end position;
moving means for moving the winding core at the winding start position to the winding end position;
A second grip that grips either the belt-shaped positive electrode sheet or the negative electrode sheet that connects the winding cores at both positions and moves in parallel from the winding start position to the winding core side at the winding end position. a device;
A winding device for electrode material that does not use a separator and is provided with a cutting device disposed between the second gripping device and the winding core located at the winding start position. A winding device for manufacturing a wound body by overlapping and winding a belt-shaped positive electrode sheet and a negative electrode sheet having an insulating film formed on one or both of one or both sides,
a winding core at a winding start position;
a winding core at the winding end position;
moving means for moving the winding core at the winding start position to the winding end position;
a first gripping device that grips either the belt-shaped positive electrode sheet or the negative electrode sheet that connects the winding cores at both positions and moves in parallel to the winding core side at the winding start position; a second gripping device that moves toward the winding core at the end position;
An apparatus for winding an electrode material without using a separator, comprising a cutting device disposed between the first gripping device and the second gripping device. 4. The separator-free electrode material winding apparatus according to claim 1, wherein said insulating coating does not cause an electrical short circuit and has gaps through which ions pass . 5. Any one of claims 1 to 4, wherein a gripping roller is provided in the vicinity of the winding core at the winding end position to hold the end of the positive electrode sheet or the negative electrode sheet wound around the winding core. A winding device for an electrode material that does not use the separator according to the above item. 6. The separator-free electrode material winding apparatus according to any one of claims 1 to 5, wherein the moving means is a rotating disk that is rotated around its own axis. 7. The separator-free electrode material winding apparatus according to any one of claims 1 to 6, further comprising an adhesive tape for fixing the periphery of the wound body wound around the winding core.

Images