JP5667134B2 - Cutting device and winding device - Google Patents

Description

  The present invention relates to a cutting device that cuts an electrode sheet used for, for example, a secondary battery, and a winding device including the cutting device.

  For example, a battery element used as a secondary battery such as a lithium ion battery includes an electrode sheet (positive electrode sheet) in which a positive electrode active material is applied to a predetermined metal foil, and an electrode in which a negative electrode active material is applied to a predetermined metal foil. The sheet (negative electrode sheet) is manufactured by being wound in a state of being overlapped via a separator sheet made of an insulating material (for example, a resin film or a nonwoven fabric).

  In the winding device for manufacturing the battery element, each of the sheets supplied from the roll wound in a roll is transported along a separate transport path, and finally provided in each transport path. It is sent out to the winding part at any time by the feeding mechanism. Then, when winding of one battery element is almost completed in the winding unit, the rotation of the winding core is temporarily stopped, and each sheet is gripped by the gripping means of each of the supply mechanisms, and then is transferred to each conveyance path. Each sheet is cut by the provided cutting device. Thereafter, winding of the battery element is completed by completely winding up the remaining winding portion of each sheet.

  The cutting device for cutting each sheet includes, for example, a fixed blade fixed at a predetermined position, a movable blade pivotally supported by the fixed blade, and a pressing member for pressing the sheet. In a state where the sheet is sandwiched between the members, the movable blade is rotated along the pressing member while being pressed against the fixed blade, and is rotated toward the fixed blade so that the sheet is sandwiched (for example, patent document). 1).

JP 2009-249176 A

  However, when the electrode sheet to which the active material is applied is to be cut, in the conventional cutting apparatus, the end surface of the electrode sheet after cutting is strongly rubbed by the side wall surface of the movable blade. There is a risk of powder generation.

  Similarly, in conventional cutting devices, metal powder may also be generated due to friction between metal members that come into pressure contact, such as friction between the movable blade and the metal foil, friction between the movable blade and the fixed blade, and friction between the movable blade and the pressing member. There is.

  When dust such as active material powder or metal powder is mixed in the battery element, a problem such as a short circuit may occur, which may cause a reduction in product quality.

  The present invention has been made in view of the above circumstances, and a cutting device capable of reducing the generation of dust such as active material powder and metal powder when cutting an electrode sheet, and a scissor provided with the cutting device One of the main objectives is to provide a turning device.

  Hereinafter, each means suitable for solving the above-described problem will be described separately. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means ;
A cutting apparatus comprising suction means for sucking and removing dust from a gap between the first clamping means and the second clamping means .

  According to the said means 1, compared with the conventional cutting device, the degree by which the end surface of the electrode sheet after cutting can be rubbed can be greatly reduced. Further, unlike the conventional cutting device, the movable blade and the fixed blade do not rub against each other. As a result, generation of dust such as active material powder and metal powder can be reduced when the electrode sheet is cut. As a result, it is possible to suppress the occurrence of problems such as dusts such as active material powder and metal powder being mixed into products such as winding elements, and to suppress deterioration in product quality.

  The conventional cutting device has a cantilever structure in which the electrode sheet is clamped only on the fixed blade side when the electrode sheet is cut. Therefore, the electrode sheet cannot be stably cut, resulting in a decrease in product quality and variations. Etc. are concerned. On the other hand, in this means, since the first sandwiching means and the second sandwiching means have a both-end support structure in which the electrode sheet is sandwiched on both sides of the cutting position in the longitudinal direction of the sheet, the electrode sheet can be held in a more stable state. Can be cut. In addition, in the case of a cantilever structure, it is necessary to hold the electrode sheet more strongly than that of the double-support structure, and there is a concern that the active material may be peeled off.

  In addition, in the conventional cantilever structure in which the electrode sheet is sandwiched only on the fixed blade side, the movable blade side is largely open, so that dust such as active material powder and metal powder generated at the time of cutting the sheet is reduced. There is a risk of scattering over a wide area. On the other hand, in this means, since the electrode sheet is sandwiched on both sides of the cutting position in the sheet longitudinal direction, walls are formed on both sides of the cutting position, and dust such as active material powder and metal powder is generated. Generation | occurrence | production of the malfunction of scattering in a wide range can be suppressed.

  In addition, in the conventional configuration in which the movable blade and the fixed blade are pressed to sandwich the electrode sheet, the thickness of the movable blade needs to be secured to a predetermined amount or more (for example, about 10 mm) for strength. Even if a double-supported structure in which the electrode sheet is clamped on both sides of the cutting position in the longitudinal direction is adopted, the gap between the clamping means through which the movable blade passes must be set relatively wide. On the other hand, in this means, since a gap through which the cutting blade passes can be set as narrow as possible by using a wire-shaped cutting blade, there is a problem that dust such as active material powder or metal powder is scattered. Generation | occurrence | production can be suppressed more effectively.

Moreover, according to the said means 1 , dusts, such as active material powder and metal powder which generate | occur | produced at the time of sheet | seat cutting | disconnection, can be suction-removed. As a result, it is possible to suppress the occurrence of problems such as dusts such as active material powder and metal powder mixed in the product, to suppress the deterioration of product quality, and to further enhance the effect of the means 1.

  As described above, the conventional cutting device has a cantilever structure in which the electrode sheet is sandwiched only on the fixed blade side when the electrode sheet is cut, and the movable blade side is largely open. Further, even if a double-supported structure in which the electrode sheet is clamped on both sides of the cutting position in the sheet longitudinal direction is adopted, the gap between the clamping means through which the movable blade passes must be set relatively wide. Therefore, even if a suction means for sucking and removing dust is provided, dust may not be sucked and removed efficiently.

  On the other hand, in this means, the first clamping means and the second clamping means sandwich the electrode sheet on both sides of the cutting position in the longitudinal direction of the sheet, create a wall, and use a wire-like cutting blade, Since the gap through which the cutting blade passes can be set as narrow as possible, dust such as active material powder and metal powder can be efficiently sucked and removed.

Means 2 . Forming a suction path of the suction means inside the first clamping means and / or the second clamping means;
The cutting device according to the suction passage and communicating with the suction holes, a means 1, characterized in that an opening formed at a portion facing the gap in the first holding means and / or said second holding means.

According to the above-mentioned means 2 , the cutting device can be reduced in size and compact, and the dust can be sucked and removed at a position closer to the electrode sheet more efficiently than when dust is sucked from outside the gap between the both clamping means. Can do.

Means 3 . A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means;
Integrally forming the first clamping means and the second clamping means disposed on the back side (lower side) of the electrode sheet;
Disconnect device characterized in that a bottom in the lower part of the gap.

According to the means 3 , the concave member having a groove-like gap is arranged as the clamping means on the back side (lower side) of the electrode sheet. Thereby, the closing property of the clearance gap between both clamping means can be improved, and the scattering prevention effect and suction removal efficiency of dust, such as active material powder and metal powder, can be improved more.

  Means 4. A suction means for sucking and removing dust from a gap between the first clamping means and the second clamping means;
Forming a suction path of the suction means inside the first clamping means and / or the second clamping means;
  4. A cutting apparatus according to claim 3, wherein a suction hole communicating with the suction path is formed in a portion facing the gap in the first clamping means and / or the second clamping means.

In particular, under the configuration of the means 4 , it is possible to suck and remove dust such as active material powder and metal powder falling downward by forming the suction hole at the bottom of the gap between the two clamping means. The effect can be further enhanced.

Means 5. A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means;
After the cutting of the electrode sheet, the first clamping means and the second clamping means are configured to move relative to each other along the sheet longitudinal direction of the electrode sheet while holding the electrode sheet. disconnect device you wherein a.

  In the conventional cutting device, even when the movable blade is opened after cutting the electrode sheet, the movable blade strongly rubs the end surface of the electrode sheet after cutting, and dust such as active material powder or metal powder may be generated. There is.

  On the other hand, according to the means 5, when the cutting blade is returned to the original state after the electrode sheet is cut, the cutting blade can be prevented from contacting the end face of the cut electrode sheet. As a result, generation of dust such as active material powder and metal powder can be further reduced.

Means 6. Winding means capable of winding at least the electrode sheet;
A winding device comprising the cutting device according to any one of means 1 to 5.

  According to the means 6, by providing the cutting device, it is possible to reduce the possibility that dust such as active material powder or metal powder is mixed in the winding element. As a result, it is possible to reduce the risk of occurrence of defects such as a short circuit in the manufactured wound element and to suppress the deterioration of product quality.

It is a cross-sectional schematic diagram which shows the structure of a battery element. It is a front schematic diagram which shows a winding part. It is a schematic diagram which shows schematic structure of a winding apparatus. It is a schematic diagram for demonstrating operation | movement of a cutting device, Comprising: (a) is a front schematic diagram which shows the cutting device of the state in which each pressing member opened, (b) is L1-L1 of (a). It is a line section schematic diagram. It is a schematic diagram for demonstrating operation | movement of a cutting device, Comprising: (a) is a front schematic diagram which shows the cutting device of the state which clamped the electrode sheet by each pressing member, (b) is (a). It is a L2-L2 line cross-sectional schematic diagram. It is a schematic diagram for demonstrating operation | movement of a cutting device, Comprising: (a) is a front schematic diagram which shows the cutting device of the state which cut | disconnected the electrode sheet, (b) is L3-L3 line of (a). It is a cross-sectional schematic diagram. It is a schematic diagram for demonstrating operation | movement of the cutting device in another embodiment, Comprising: (a) is a cross-sectional schematic diagram which shows the cutting device of the state in which each pressing member opened, (b) is each holding | suppressing member It is a cross-sectional schematic diagram which shows the cutting device of the state which clamped the electrode sheet with the member, (c) is a cross-sectional schematic diagram which shows the cutting device of the state which cut | disconnected the electrode sheet, (d) is cutting of an electrode sheet It is a cross-sectional schematic diagram which shows the cutting device of the state which the press piece which clamped the upstream of the position and the press piece which clamped the downstream moved to the direction which mutually spaces apart.

  Hereinafter, an embodiment will be described with reference to the 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, a lithium ion battery element (hereinafter referred to as “battery element”) 1 has two separator sheets 3 and 4, a positive electrode sheet 5, and a negative electrode with respect to a cylindrical core core 2. A belt-like body 7 constituted by the electrode sheet 6 is wound. In FIG. 1, for convenience of explanation, there are places where the separator sheets 3 and 4, the positive electrode sheet 5, and the negative electrode sheet 6 are spaced apart from each other.

  In the present embodiment, the core core 2 is formed of a material having sufficient rigidity (for example, a metal material such as aluminum or a resin material such as polypropylene). Further, the core core 2 has an insertion hole 8 having a square cross section that engages with a later-described winding shaft 20.

  The separator sheets 3 and 4 have the same width as the length along the longitudinal direction of the core core 2, so as to prevent different electrode sheets 5 and 6 from contacting each other and causing a short circuit. Insulators, in particular in the present embodiment, are made of polypropylene.

  Similarly to the separator sheets 3 and 4, the electrode sheets 5 and 6 also have substantially the same width as the length along the longitudinal direction of the core 2. The electrode sheets 5 and 6 have a main body portion made of a thin metal foil, and an active material is continuously applied (applied) along the longitudinal direction of the sheet on both front and back surfaces. Thereby, the active material coating part and the active material uncoated part will be formed in the sheet | seat width direction in the electrode sheets 5 and 6. FIG. Leads (not shown) are welded to uncoated portions of the electrode sheets 5 and 6, respectively.

  When obtaining a lithium ion battery, the battery element 1 is disposed in a metallic battery container (not shown) and the lead on the positive electrode side and the lead on the negative electrode side are combined. The collected positive lead is connected to a positive terminal component (not shown), and the negative lead is also connected to a negative terminal component (not shown). And a lithium ion battery is completed by providing both terminal components in the both-ends opening of the said electrical container.

  In this embodiment, an aluminum foil sheet is used for the positive electrode sheet 5, and the positive electrode active material is applied to both the front and back surfaces. Moreover, the copper foil sheet | seat is used for the negative electrode sheet 6, and the negative electrode active material is apply | coated to the front and back both surfaces.

  In general, as an electrode sheet for a lithium ion battery element, the thickness of the metal foil is 15 μm to 100 μm, the thickness of the active material on both the front and back surfaces is 15 μm to 100 μm, respectively, and a total of 50 μm to 300 μm can be considered. Among these, in this embodiment, the thickness of the metal foil is 50 μm, the thickness of the active material on both the front and back surfaces is 50 μm, respectively, and the electrode sheets 5 and 6 of 150 μm are employed as a whole.

  Next, a winding device for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 60 includes an electrode sheet conveyance mechanism 61 that conveys the positive electrode sheet 5, an electrode sheet conveyance mechanism 62 that conveys the negative electrode sheet 6, and a separator sheet conveyance that conveys the separator sheets 3 and 4. Mechanisms 63 and 64 are provided.

  In each of the sheet conveying mechanisms 61 to 64, each sheet is pulled out from the roll wound in a roll shape and supplied to a winding unit 65 serving as a winding unit. The sheets conveyed by the sheet conveying mechanisms 61 to 64 are wound up in the winding unit 65 so that the sheets overlap each other. Various mechanisms in the winding device 60 such as the winding unit 65 and the sheet conveying mechanisms 61 to 64 are configured to be controlled by a control device (not shown).

  Here, the configuration of the winding unit 65 will be described in detail with reference to FIG. As shown in FIG. 2, the winding unit 65 includes a turret 12 that is rotatably provided. The turret 12 is configured such that two disk-shaped tables 14 and 15 face each other. Both tables 14 and 15 (turret 12) are configured to rotate clockwise and are set so that both tables 14 and 15 rotate synchronously.

  Between the tables 14 and 15, the winding shafts 20 are provided at two places at intervals of 180 ° in the rotation direction of the tables 14 and 15. Each winding shaft 20 moves alternately between the attachment / detachment position P1 and the winding position P2.

  The attach / detach position P1 is a position for attaching the core core 2 and removing the battery element 1, and for attaching and removing the core element 2 corresponding to the attach / detach position P1. An attachment / detachment device 13 is provided.

  On the other hand, the winding position P2 is a position where the belt-like body 7 is wound around the core core 2, and each of the sheet conveying mechanisms 61 to 64 is connected to the winding shaft 20 located at the winding position P2. A sheet is supplied.

  In the present embodiment, separator fixing means (not shown) is provided corresponding to the winding position P2. The separator fixing means is configured such that the leading end portions of the separator sheets 3 and 4 can be attached to the surface of the core core 2 by, for example, heat welding in the initial stage of winding. Of course, it is possible to use a configuration in which the tip portions of the separator sheets 3 and 4 are simply attached to the surface of the core core 2 using an adhesive tape or the like.

  Next, the structure of the electrode sheet conveyance mechanisms 61 and 62 will be described in detail with reference to FIG. However, in FIG. 3, only the electrode sheet transport mechanism 62 is shown in detail for convenience, but the electrode sheet transport mechanism 61 has the same configuration.

  On the most upstream side of the electrode sheet conveyance mechanisms 61 and 62, an original fabric 70 in which the electrode sheets 5 and 6 are wound in a roll shape is rotatably supported. A tension applying means 72 is provided on the downstream side of the original fabric 70. The tension applying means 72 in this embodiment includes a pair of rollers 73 and 74 and a step roller 75 provided between the rollers 73 and 74.

  A sheet supply mechanism 80 for supplying the electrode sheets 5 and 6 to the winding unit 65 is provided on the downstream side of the tension applying unit 72.

  The sheet supply mechanism 80 includes a pair of upper and lower chucks 80a and 80b. The chucks 80a and 80b are configured to be opened and closed by driving means (not shown).

  The sheet supply mechanism 80 is configured to be able to advance and retract along the conveyance path of the electrode sheets 5 and 6. More specifically, the sheet supply mechanism 80 is configured to be movable between a retracted position spaced a considerable distance from the winding unit 65 and a closest position closest to the winding unit 65 by a driving unit (not shown). Yes. The closest approach position is a position that is close enough to allow the tip portions of the electrode sheets 5 and 6 held by the chucks 80 a and 80 b to start winding based on the rotation of the winding shaft 20.

  A cutting device 82 for cutting the electrode sheets 5 and 6 is provided on the downstream side of the sheet supply mechanism 80.

  Here, the configuration of the cutting device 82 will be described in detail with reference to FIGS. The cutting device 82 includes a wire cutter 90 as a cutting means for cutting the electrode sheets 5 and 6, a lower pressing member 91 for pressing the electrode sheets 5 and 6 below the electrode sheets 5 and 6, and sheet cutting. An upper pressing member 92 that presses the electrode sheets 5 and 6 is sometimes provided above the electrode sheets 5 and 6.

  The wire cutter 90 includes a support member 90a bent in a U-shape along the sheet width direction of the electrode sheets 5 and 6 (left and right direction in FIG. 5A, depth direction in FIG. 5B), and the support member 90a. It has a metal cutting wire (wire-shaped cutting blade) 90b stretched between both end portions of the member 90a in a tension state.

  In general, as a metal cutting wire for cutting an electrode sheet having an overall thickness of 50 μm to 300 μm, one having a diameter of 15 μm to 50 μm is conceivable. In this embodiment, an electrode sheet having a thickness of 150 μm is used. Corresponding to 5 and 6, a cutting wire 90b having a diameter W0 (see FIG. 6A) of 30 μm is employed.

  Of course, the thickness and material of the cutting wire 90b are not limited to this, and can be changed as appropriate.

  The wire cutter 90 is configured to be displaceable by a driving means (not shown). More specifically, the wire cutter 90 is configured to be rotatable about a support shaft 90c provided at one end in the longitudinal direction of the support member 90a, and the cutting wire 90b is placed in a lower pressing member 91 (a slit 91a described later). It is displaced between the cutting position (see FIG. 6) to be inserted and the separating position (see FIG. 5) where the cutting wire 90b is pulled out upward from the upper pressing member 92 (a slit 92a described later).

  Further, the wire cutter 90 is configured to be horizontally movable in the sheet width direction of the electrode sheets 5 and 6, and is retracted at a considerable distance from the conveyance path of the electrode sheets 5 and 6 and close to the conveyance path of the electrode sheets 5 and 6. It is displaced between the approached positions (see FIG. 5).

  The lower pressing member 91 is formed in a long shape along the sheet width direction of the electrode sheets 5 and 6 and is configured to be displaceable by a driving unit (not shown). More specifically, the lower pressing member 91 is configured to be horizontally movable in the sheet width direction of the electrode sheets 5, 6, and a retreat position that is spaced a considerable distance from the conveyance path of the electrode sheets 5, 6 and the electrode sheets 5, 6. It is displaced between an approach position (see FIG. 4) approaching the transport path.

  Further, the lower pressing member 91 is configured to be movable up and down, and is spaced apart from the electrode sheets 5 and 6 by a considerable distance (see FIG. 4), and comes into contact with the electrode sheets 5 and 6 and contacts the electrode sheets 5 and 6. It is displaced between the pressing position (see FIG. 5) for pressing the.

  A bottomed slit 91 a is formed on the upper surface of the lower pressing member 91 along the sheet width direction of the electrode sheets 5 and 6. Accordingly, the lower pressing member 91 includes a pair of pressing pieces 91b that are divided with respect to the longitudinal direction of the electrode sheets 5 and 6 through the slit 91a.

  The slit 91a is a part into which the cutting wire 90b is inserted when cutting the sheet, and its width along the longitudinal direction of the electrode sheets 5 and 6 (the depth direction in FIG. 5A and the left-right direction in FIG. 5B). W1 is set at an interval that prevents at least the cutting wire 90b from contacting the side wall surface of the slit 91a during sheet cutting (see FIG. 6B).

  In general, a slit through which a cutting wire having a diameter of 15 μm to 50 μm passes may have a width of 0.5 mm to 3 mm. In this embodiment, the cutting wire 90b having a diameter W0 of 30 μm is used. Correspondingly, a slit 91a having a width W1 of 1 mm is employed. Of course, the width W1 of the slit 91a is not limited to this, and can be changed as appropriate.

  A plurality of suction holes 91c are formed at predetermined intervals along the longitudinal direction at the bottom of the slit 91a. A suction path 91d that communicates with each suction hole 91c is formed in the lower pressing member 91 along the longitudinal direction thereof.

  The suction path 91d is connected to a suction device (not shown) via a suction hose (not shown). When the suction device is activated, suction in the slit 91a is performed via the suction path 91d and the suction hole 91c. Therefore, the suction device, the suction hose, the suction path 91d, and the suction hole 91c constitute the suction means in this embodiment.

  The upper pressing member 92 is formed in an elongated shape along the sheet width direction of the electrode sheets 5 and 6 and is configured to be displaceable in synchronization with the lower pressing member 91 by a driving unit (not shown). More specifically, the upper pressing member 92 is configured to be horizontally movable in the sheet width direction of the electrode sheets 5 and 6, similarly to the lower pressing member 91, and has a retracted position separated from the conveyance path of the electrode sheets 5 and 6 by a considerable distance. Then, it is displaced between the approach positions (see FIG. 4) approaching the transport path of the electrode sheets 5 and 6.

  Further, the upper pressing member 92 is configured to be movable up and down, and is spaced apart from the electrode sheets 5 and 6 by a considerable distance (see FIG. 4), and comes into contact with the electrode sheets 5 and 6 and contacts the electrode sheets 5 and 6. It is displaced between the pressing position (see FIG. 5) for pressing the.

  The upper pressing member 92 includes a pair of pressing pieces 92b divided in the longitudinal direction of the electrode sheets 5 and 6 through the slit 92a.

  The slit 92a is a part through which the cutting wire 90b passes when cutting the sheet, and the width W2 along the longitudinal direction of the electrode sheets 5 and 6 is such that at least the cutting wire 90b contacts the side wall surface of the slit 92a when cutting the sheet. The interval is set so as not to occur [see FIG. 6B].

  Similar to the slit 91a, in this embodiment, a slit 92a having a width W2 of 1 mm is employed in correspondence with the cutting wire 90b having a diameter W0 of 30 μm. Of course, the width W2 of the slit 92a is not limited to this, and can be changed as appropriate.

  A plurality of suction holes 92c are formed at predetermined intervals along the longitudinal direction of opposing surfaces of the pair of pressing pieces 92b (side wall surfaces of the slit 92a). A suction path 92d communicating with each suction hole 92c is formed along the longitudinal direction inside each pressing piece 92b.

  Similarly to the suction path 91d, the suction path 92d is connected to a suction device (not shown) via a suction hose (not shown). When the suction device is activated, suction in the slit 92a is performed via the suction path 92d and the suction hole 92c. Accordingly, as in the above, the suction device in the present embodiment is configured by the suction device, the suction hose, the suction path 92d, and the suction hole 92c.

  Next, the manufacturing method of the battery element 1 by the winding apparatus 60 mentioned above is demonstrated.

  First, one winding shaft 20 is moved to the attachment / detachment position P1 by rotating the turret 12 halfway clockwise. At this time, the other winding shaft 20 is positioned at the winding position P2. For example, the winding shaft 20 that has been positioned at the winding position P2 until the winding of the belt-like body 7 is almost completed is moved to the attachment / detachment position P1. On the other hand, the winding shaft 20 that has been positioned at the attachment / detachment position P1 and on which the new core core 2 is mounted is moved to the winding position P2.

  In the winding shaft 20 positioned at the winding position P2, the core core 2 is mounted, but nothing is wound around the core core 2 at the beginning. In this state, first, the tip end portions of the separator sheets 3 and 4 are attached and fixed to the surface of the core core 2 by the separator fixing means described above.

  Subsequently, at the winding position P2, the winding shaft 20 is rotated. When the predetermined timing arrives, the sheet supply mechanisms 80 of the electrode sheet conveyance mechanisms 61 and 62 are operated, and the electrode sheets 5 and 6 are supplied toward the core core 2.

  More specifically, each of the electrode sheets 5 and 6, whose tip portions have been gripped by the chucks 80 a and 80 b until then, move the sheet supply mechanism 80 (chuck 80 a and 80 b) toward the winding shaft 20, thereby Supplied toward the core 2. As a result, the tips of the electrode sheets 5 and 6 are sandwiched between the separator sheets 3 and 4, and the electrode sheets 5 and 6 are wound up in an insulated state via the separator sheets 3 and 4, respectively. Will start.

  When the winding of the electrode sheets 5 and 6 is started, the chucks 80a and 80b are opened. Thereby, the electrode sheets 5 and 6 are wound together with the separator sheets 3 and 4 while being given a predetermined tension by the tension applying means 72.

  As the chucks 80a and 80b are opened, the sheet supply mechanism 80 moves somewhat upstream (side away from the winding shaft 20), and stands by at that position during winding.

  When the winding of the strip 7 for one element is almost completed, the rotation of the winding shaft 20 is temporarily stopped. The timing of the stop is determined based on the measurement value of the encoder provided on the winding shaft 20. Thereby, the rotation of the winding shaft 20 is stopped at the timing when the predetermined cutting position of each electrode sheet 5, 6 is positioned at the position of the cutting device 82.

  Once the rotation of the winding shaft 20 is stopped, each of the electrode sheets 5 and 6 is held by the chucks 80a and 80b of the sheet supply mechanism 80, and then the cutting device 82 is operated to cut each of the electrode sheets 5 and 6. The

  Then, after rotating the winding shaft 20 somewhat, the separator sheets 3 and 4 are also cut. Then, the remaining cut strips 7 (each of the sheets 3 to 6) are completely wound up, and the winding is completed by tape-fastening the separator sheets 3 and 4 on the outer peripheral side.

  Then, after moving the winding shaft 20 and the like to the attachment / detachment position P1, the battery element 1 is obtained by removing the wound core core 2 of the belt-like body 7 together.

  Here, the operation of the cutting device 82 will be described in more detail. As described above, when the predetermined cutting position of the electrode sheets 5 and 6 is stopped at the position of the cutting device 82 (the slits 91a and 92a of the pressing members 91 and 92), first, the retracted position (electrode sheets 5 and 6). The pressing members 91 and 92 that have been retreated to the outside of the transport path) move to the approach position (the transport path of the electrode sheets 5 and 6), and the press members 91 and 92 each move to the pressing position (the electrode sheet). 5 and 6 (see FIGS. 4A and 4B).

  The upstream and downstream sides of the cutting position of the electrode sheets 5 and 6 are sandwiched between the pair of pressing pieces 91b of the lower pressing member 91 and the pair of pressing pieces 92b of the upper pressing member 92, respectively, and the retraction position The wire cutter 90 that has been retracted to the outside of the transport path of the electrode sheets 5 and 6 moves to the approach position (the transport path of the electrode sheets 5 and 6) [see FIGS. 5A and 5B] . In the present embodiment, of the pair of pressing pieces 91b of the lower pressing member 91 and the pair of pressing pieces 92b of the upper pressing member 92, the pressing piece 91b that holds the upstream side of the cutting position of the electrode sheets 5 and 6. 92b constitutes the first clamping means, and the pressing pieces 91b, 92b clamping the downstream side of the cutting position of the electrode sheets 5 and 6 constitute the second clamping means.

  Subsequently, the wire cutter 90 rotates around the support shaft 90c. Thereby, the cutting wire 90b passes through the slit 92a of the upper pressing member 92, and cuts the electrode sheets 5 and 6 from one end side to the other end side in the sheet width direction. Thereafter, the cutting wire 90b is accommodated in the slit 91a of the lower pressing member 91 (see FIGS. 6A and 6B). Accordingly, the slits 91a and 92a correspond to the gaps in the present embodiment.

  When the cutting of the electrode sheets 5 and 6 is completed, the wire cutter 90 is separated from the pressing members 91 and 92, and the cutting wire 90b comes out of the slits 91a and 92a. The suction in the slits 91a and 92a is performed through the. Thereby, dust such as active material powder and metal powder generated when the electrode sheets 5 and 6 are cut is removed by suction.

  As described above in detail, in the present embodiment, by using the cutting wire 90b as the cutting blade, the degree to which the end surfaces of the electrode sheets 5 and 6 after cutting are rubbed is significantly reduced as compared with the conventional cutting device. be able to. Further, unlike the conventional cutting device, the movable blade and the fixed blade do not rub against each other. As a result, when the electrode sheets 5 and 6 are cut, generation of dust such as active material powder and metal powder can be reduced. As a result, it is possible to suppress the occurrence of problems such as dusts such as active material powder and metal powder entering the battery element 1, and to suppress the deterioration of product quality.

  In addition, the present embodiment has a double-sided structure in which the electrode sheets 5 and 6 are sandwiched by the pressing members 91 and 92 on both sides of the cutting position in the longitudinal direction of the sheet. The electrode sheets 5 and 6 can be cut in a more stable state.

  Further, in this embodiment, the pressing members 91 and 92 hold the electrode sheets 5 and 6 on both sides of the cutting position in the longitudinal direction of the sheet to form walls, and by using the cutting wire 90b as a cutting blade, the slits are obtained. Since the widths W1 and W2 of 91a and 92a can be set as narrow as possible, it is possible to prevent dust such as active material powder and metal powder generated when the electrode sheets 5 and 6 are cut from being scattered in a wide range and efficiently suck Can be removed.

  In particular, in the present embodiment, since the bottom of the slit 91a of the lower pressing member 91 is closed and the suction hole 91c is formed at the bottom, the closing performance of the slits 91a and 92a is improved, and active material powder or metal The effect of preventing scattering of dust such as powder and suction removal efficiency can be further enhanced.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the above embodiment, the battery device 1 of the lithium ion battery is manufactured by the winding device 60. However, the winding device manufactured by the winding device 60 is not limited to this, for example, A winding element such as a lithium ion capacitor or an electrolytic capacitor may be manufactured.

  (B) In the said embodiment, although the battery element 1 is materialized about the case where the core core 2 is comprised, as a case where the type of battery element which does not have the said core core 2 is obtained is materialized. Also good. Further, the outer peripheral shape of the core core 2 may be, for example, a flat non-circular cross section.

  (C) The configuration of the winding device 60 (the electrode sheet transport mechanisms 61 and 62, the winding unit 65, etc.) in the above embodiment is merely an example, and other configurations may be adopted.

  (D) In the said embodiment, although the cutting device 82 which concerns on this invention is embodied as a structure provided in the winding apparatus 60 for manufacturing the battery element 1, it is not restricted to this, Other winding apparatuses Alternatively, it may be embodied as a configuration assembled to something other than a winding device. Of course, the cutting device 82 can be used alone.

  (E) The configuration of the cutting device 82 is not limited to the above embodiment, and other configurations may be employed.

  For example, in the cutting apparatus 100 shown in FIG. 7, a wire cutter 101 as a cutting means for cutting the electrode sheets 5 and 6 and a lower part for pressing the electrode sheets 5 and 6 below the electrode sheets 5 and 6 when the sheet is cut. A pressing member 93 and an upper pressing member 94 that presses the electrode sheets 5 and 6 above the electrode sheets 5 and 6 when the sheet is cut are provided.

  The wire cutter 101 includes a support member 101a bent in a U shape along the sheet width direction of the electrode sheets 5 and 6, and a metal cutting wire stretched between both ends of the support member 101a in a tension state. 101b.

  The wire cutter 101 is configured to be displaceable by a driving unit (not shown). More specifically, the wire cutter 101 is configured to be horizontally movable in the sheet width direction of the electrode sheets 5, 6, and a retreat position that is spaced a considerable distance from the conveyance path of the electrode sheets 5, 6 and the conveyance path of the electrode sheets 5, 6. It is displaced between the approach positions approaching

  The wire cutter 101 is configured to be movable up and down in a state in which the cutting wire 101b is parallel (horizontal) to the sheet width direction of the electrode sheets 5 and 6, and the cutting wire 101b is a lower pressing member 93 (described later). A cutting position (see FIG. 7C) to be inserted into the slit 93a) and a separation position in which the cutting wire 101b slips upward from an upper pressing member 94 (a slit 94a described later) (see FIG. 7B). Displace between.

  At the time of cutting the sheet, instead of the above configuration, the cutting wire 101b may move up and down while being inclined with respect to the sheet width direction (horizontal direction) of the electrode sheets 5 and 6. Further, the cutting wire 101b may be horizontally moved along the sheet width direction of the electrode sheets 5 and 6 in a state where the cutting wire 101b is inclined with respect to the sheet width direction of the electrode sheets 5 and 6.

  Each pressing member 93, 94 is formed in an elongated shape along the sheet width direction of the electrode sheets 5, 6, and is configured to be displaceable by a driving means (not shown). More specifically, the pressing members 93 and 94 are configured to be horizontally movable in the sheet width direction of the electrode sheets 5 and 6, respectively. , 6 between the approach positions approaching the transport path.

  Each of the pressing members 93 and 94 is configured to be movable up and down, is spaced apart from the electrode sheets 5 and 6 by a considerable distance (see FIG. 7A), and comes into contact with the electrode sheets 5 and 6 and the electrode sheets. It is displaced between the pressing positions for pressing 5 and 6 (see FIG. 7B).

  Each pressing member 93, 94 is composed of a pair of pressing pieces 93b, 94b divided in the longitudinal direction of the electrode sheets 5, 6 via slits 93a, 94a, respectively.

  The pressing pieces 93b and 94b are configured to be horizontally movable along the sheet longitudinal direction of the electrode sheets 5 and 6, respectively.

  A plurality of suction holes 93c and 94c are formed at predetermined intervals along the longitudinal direction of opposing surfaces of the pair of pressing pieces 93b and 94b (side wall surfaces of the slits 93a and 94a). Further, suction paths 93d and 94d communicating with the suction holes 93c and 94c are formed along the longitudinal direction inside the pressing pieces 93b and 94b, respectively.

  As in the above embodiment, the suction paths 93d and 94d are connected to a suction device (not shown) via a suction hose (not shown).

  Next, the operation of the cutting device 100 will be described in more detail. When the predetermined cutting position of the electrode sheets 5 and 6 is stopped at the position of the cutting device 100 (the slits 93a and 94a of the pressing members 93 and 94) as in the above embodiment, first, the retracted position (the electrode sheet 5) is first stopped. , 6 are moved to the approach position (conveying path of the electrode sheets 5 and 6), and the pressing members 93 and 94 are respectively moved to the pressing position (outside the conveyance path). It moves toward the electrode sheets 5 and 6 side (see FIG. 7A).

  The upstream side and the downstream side of the cutting position of the electrode sheets 5 and 6 are held by the pair of pressing pieces 93b of the lower pressing member 93 and the pair of pressing pieces 94b of the upper pressing member 94, respectively, and the retraction position The wire cutter 101 evacuated to the outside (outside the conveying path of the electrode sheets 5 and 6) moves to the approach position (the conveying path of the electrode sheets 5 and 6) [see FIG. 7B].

  Subsequently, the wire cutter 101 is lowered. Then, the cutting wire 101b passes through the slit 94a of the upper pressing member 94 and moves to the slit 93a of the lower pressing member 93, whereby the electrode sheets 5 and 6 are cut (see FIG. 7C).

  In this embodiment, while the cutting operation by the wire cutter 101 is performed, the suction device continues to operate, and suction in the slits 93a and 94a is performed through the suction holes 93c and 94c. Thereby, dust such as active material powder and metal powder generated when the electrode sheets 5 and 6 are cut is removed by suction.

  In addition, in this embodiment, it is good also as a structure which provided the saucer etc. which receive dusts, such as active material powder | flour and metal powder, in the downward position of slit 93a, 94a.

  When the cutting of the electrode sheets 5 and 6 is finished, the pressing pieces 93b and 94b that sandwich the upstream side of the cutting position of the electrode sheets 5 and 6, and the pressing pieces 93b that clamp the downstream side of the cutting position of the electrode sheets 5 and 6; 94b move in the direction of separating from each other along the sheet longitudinal direction of the electrode sheets 5 and 6 while holding the electrode sheets 5 and 6, respectively. Here, only one side of the holding pieces 93b and 94b on the upstream side and the downstream side may be separated from the other side. Thereafter, the wire cutter 101 moves up and returns to the original state (see FIG. 7D).

  In the present embodiment, after the electrode sheets 5 and 6 are cut, the width of the slits 93a and 94a, and the distance between the upstream end face and the downstream end face of the electrode sheets 5 and 6 after cutting is increased. Can be prevented from coming into contact with the end surfaces of the electrode sheets 5 and 6 after being cut when the wires 93b are pulled out from the slits 93a and 94a.

  Of course, under the configuration illustrated in FIG. 7, the pressing pieces 93 b and 94 b that sandwich the upstream side of the cutting position of the electrode sheets 5 and 6 and the pressing pieces 93 b that clamp the downstream side of the cutting position of the electrode sheets 5 and 6. A configuration may be employed in which the widths of the slits 93a and 94a are kept constant as in the above embodiment, without being separated from each other.

  (F) In the above embodiment, the wire cutter 90 is rotated when the electrode sheets 5 and 6 are cut. However, the configuration is not limited to this, and the wire cutter 90 is similar to the configuration illustrated in FIG. A configuration may be adopted in which moves linearly.

  (G) In the above-described embodiment and the configuration illustrated in FIG. 7, all of the pressing members 91 and 92 (93 and 94) include suction holes 91c and 92c (93c and 94c) and suction paths 91d and 92d (93d, 94d) is formed. However, the present invention is not limited to this. For example, a suction means may be provided only in a part of the pressing members 91 and 92 (93, 94), such as providing the suction hole 91c and the suction path 91d only in the lower pressing member 91.

  Moreover, it is good also as a structure provided with the suction means which sucks and removes the dust in slit 91a, 92a (slit 93a, 94a) from the exterior independently of pressing member 91,92 (93,94).

  Of course, it is good also as a structure which does not have the suction means which sucks and removes dust from the slits 91a and 92a (slits 93a and 94a).

  DESCRIPTION OF SYMBOLS 1 ... Battery element, 3, 4 ... Separator sheet, 5 ... Positive electrode sheet, 6 ... Negative electrode sheet, 7 ... Strip | belt body, 60 ... Winding apparatus, 61,62 ... Electrode sheet conveyance mechanism, 65 ... Winding part, 82 ... Cutting device, 90 ... Wire cutter, 90b ... Cutting wire, 91 ... Lower pressing member, 91a ... Slit, 91b ... Holding piece, 91c ... Suction hole, 91d ... Suction path, 92 ... Upper pressing member, 92a ... Slit, 92b ... Pressing piece, 92c ... Suction hole, 92d ... Suction path.

Claims (6)

A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means ;
A cutting apparatus comprising suction means for sucking and removing dust from a gap between the first clamping means and the second clamping means . Forming a suction path of the suction means inside the first clamping means and / or the second clamping means;
The apparatus according to claim 1, characterized in that said suction path communicating with sucking hole, an opening formed at a portion facing the gap in the first holding means and / or said second holding means. A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means ;
Integrally forming the first clamping means and the second clamping means disposed on the back side of the electrode sheet;
A cutting device characterized in that a bottom portion is provided below the gap .   A suction means for sucking and removing dust from a gap between the first clamping means and the second clamping means;
Forming a suction path of the suction means inside the first clamping means and / or the second clamping means;
  The cutting device according to claim 3, wherein a suction hole communicating with the suction path is formed in a portion facing the gap in the first clamping means and / or the second clamping means. A cutting device for cutting a strip-shaped electrode sheet coated with an active material,
First clamping means capable of clamping the electrode sheet from both front and back surfaces;
A second clamping means that is arranged with a predetermined gap from the first clamping means with respect to the sheet longitudinal direction of the electrode sheet, and capable of clamping the electrode sheet from both front and back surfaces;
Cutting means having a wire-like cutting blade capable of cutting the electrode sheet through a gap between the first clamping means and the second clamping means ;
After the cutting of the electrode sheet, the first clamping means and the second clamping means are configured to move relative to each other along the sheet longitudinal direction of the electrode sheet while holding the electrode sheet . A cutting device characterized by that. Winding means capable of winding at least the electrode sheet;
A winding device comprising the cutting device according to any one of claims 1 to 5.

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