JP2018170103A - Inspection equipment and winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inspection equipment and a winding device capable of determining the quality of a wound element accurately, and capable of improving inspection reliability sufficiently.SOLUTION: Inspection equipment includes lighting devices 19a, 19b for irradiating inspection objects, i.e., various sheets 2-5 wound around wound cores 13, 14, with prescribed light, a camera 20 having a prescribed lens and imaging the inspection objects irradiated with light by the lighting devices 19a, 19b, and a controller for determining the quality of the inspection objects, based on an image obtained by means of the camera 20. The camera 20 can move relatively to the wound cores 13, 14 in the optical axis OP direction of the lens, and is configured to move relatively to the wound cores 13, 14 according to the thickness of the various sheets 2-5 wound around the wound cores 13, 14, so as to focus the inspection objects while winding the various sheets 2-5 around the wound cores 13, 14.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an inspection device for inspecting a winding element used for a secondary battery or the like, and a winding device including the inspection device.

  As the winding element, one used for a secondary battery such as a lithium ion battery is known. This type of winding element can be rotated with a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material interposed between separator sheets for insulating both electrode sheets. It is manufactured by being wound by a simple winding core.

  By the way, the sheet in the winding element component, such as winding misalignment (position misalignment in the sheet width direction) or misalignment of the active material application position during the winding of each sheet. There is a possibility that a positional shift along the width direction may occur. Such misalignment may cause a short circuit or the like, for example, and may cause deterioration in quality of the manufacturing element.

  Therefore, as an inspection device for detecting the presence or absence of winding deviation, the separator sheet and the separator sheet are separated by an imaging unit (imaging device) arranged corresponding to the sheet conveyance path upstream of the winding core (rotating shaft). There has been proposed a technique in which an electrode sheet is picked up and an inspection is performed on winding deviation based on the obtained image data (see, for example, Patent Document 1).

  However, this inspection device is merely a device for detecting a positional deviation of the sheet before being wound by the winding core. Therefore, there is a possibility that the quality determination result by this inspection apparatus does not necessarily match the quality of the actual winding element obtained by winding each sheet. Therefore, there is a possibility that the quality of the winding element cannot be accurately determined.

  On the other hand, an inspection apparatus has been proposed in which each sheet wound around a winding core is imaged and the presence or absence of winding deviation in the winding element is determined based on the obtained image (see, for example, Patent Documents 2 and 3). ).

JP 2009-170136 A JP 2006-145298 A Japanese Patent Laid-Open No. 2006-58179

  By the way, in the inspection apparatus as described above, it is preferable to increase the measurement resolution (image resolution) as much as possible from the viewpoint of increasing the reliability of the inspection.

  However, increasing the measurement resolution results in a shallow depth of field in the imaging means. Therefore, as each sheet is rolled up, each sheet wound around the core becomes thicker, and when each sheet to be imaged approaches the imaging unit, the sheet is focused. Cannot be performed and the image may be blurred.

  On the other hand, it can be considered that each sheet is in focus when the winding of each sheet proceeds. In this case, immediately after starting the winding of each sheet, that is, from the imaging means. When the sheets to be imaged are separated from each other, it is not possible to focus on the sheets and the image may be blurred.

  In this way, if the depth of field is made shallow in order to increase the measurement resolution, it is not possible to sufficiently cope with the variation in the distance between each sheet and the imaging means due to winding, and as a result, the inspection is performed. Such reliability may not be sufficiently increased.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to more accurately determine the quality of the winding element and to sufficiently increase the reliability related to the inspection. It is providing a device and a winding device.

  In the following, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A winding manufactured by winding a belt-like positive electrode sheet coated with an active material and a negative electrode sheet alternately with a rotatable core through a belt-like separator sheet made of an insulating material. An inspection device used in the manufacturing process of a rotating element,
Irradiation means for irradiating the inspection object with predetermined light, with each sheet wound around the core as an inspection object;
An imaging unit having a predetermined lens and imaging the inspection object irradiated with light by the irradiation unit;
Based on the image obtained by the imaging means, and a quality determination means for determining the quality of the inspection object,
The imaging means is movable relative to the core along the optical axis direction of the lens, and the winding is performed so that the inspection object is in focus while each sheet is wound around the core. An inspection apparatus configured to move relative to the core in accordance with the thickness of each sheet wound around the core.

  Note that “wound around the core” means that the core is in close contact with the outer peripheral surface of the core located in the lower layer of the core and the sheet without being lifted.

  According to the means 1, the electrode sheet or separator sheet wound around the winding core is used as an inspection object, the inspection object is imaged by the imaging unit, and based on the image obtained by the imaging, the pass / fail determination unit is the inspection object. Judge the quality. That is, the pass / fail judgment means judges pass / fail for the inspection object actually wound. The pass / fail judgment may be made, for example, regarding the presence or absence of winding deviation of the sheet, the position of the active material applied portion (active material coating part) in the electrode sheet, the position of the tab provided on the electrode sheet, etc. You may carry out about other items. By performing pass / fail determination on the inspection target actually wound, it is possible to more accurately determine pass / fail regarding the quality of the winding element.

  Further, according to the means 1, the imaging means can be moved relative to the winding core along the optical axis direction of the lens, and during the winding of each sheet, the inspection object is focused. According to the thickness of each sheet wound around the core, the sheet moves relatively along the optical axis direction. For example, immediately after the start of winding of each sheet, and when each sheet wound on the core is thin, the imaging unit images the inspection object at a position where the distance to the core is relatively small. On the other hand, for example, when each sheet wound on the core becomes thicker as the winding of each sheet progresses (when the amount of winding of each sheet increases), the imaging means has a distance from the core. The inspection object is imaged at a relatively large position. This makes it possible to focus on the inspection object more reliably while reducing the depth of field and increasing the measurement resolution. In other words, it is possible to obtain the same effect as in the case of simultaneously realizing both the measurement resolution and the depth of field (widening the in-focus range) in a trade-off relationship. it can. As a result, the reliability related to the inspection can be sufficiently increased.

  Furthermore, the movement of the image pickup means causes a relatively large variation in the diameter of each sheet during winding from the start of winding to the end of winding, such as when the winding element is large. It is possible to cope with such cases. Therefore, it is possible to accurately inspect winding elements of various sizes.

  Mean 2. 2. The inspection apparatus according to claim 1, wherein the imaging means is configured to continuously move relative to the core while each sheet is wound around the core.

  According to the above means 2, the imaging means moves continuously, not intermittently, during winding of each sheet. Therefore, it is possible to effectively suppress the occurrence of vibrations in the imaging unit, as compared with the case where the movement and the temporary stop are alternately repeated in the imaging unit. As a result, an image in focus with respect to the inspection object can be obtained more reliably, and the reliability related to the inspection can be further enhanced. Furthermore, the control relating to the movement of the imaging means is facilitated, and the burden on the control process can be reduced.

Means 3. A rotation angle detecting means capable of detecting the rotation angle of the winding core;
The imaging means is configured to take an image of the inspection object every time the rotation angle of the core detected by the rotation angle detection means becomes a predetermined constant angle. The inspection apparatus according to 1 or 2.

  According to the means 3, the imaging object is imaged every time the winding core has a certain rotation angle. Therefore, the control related to the imaging timing becomes easy, and the burden on the control processing can be further reduced.

Means 4. The separator sheet is transparent or translucent,
The imaging means is configured to image both the electrode sheets and the separator sheet at a time by imaging at least one of the both electrode sheets through the separator sheet. The inspection apparatus according to any one of means 1 to 3.

  According to the said means 4, both electrode sheets and a separator sheet can be imaged at once. Accordingly, an image necessary for inspection can be obtained with a small number of imaging operations, and inspection efficiency can be improved.

  Means 5. A winding device comprising the inspection device according to any one of means 1 to 4.

  According to the means 5, basically the same operational effects as the means 1 and the like can be obtained.

It is a perspective schematic diagram which shows the structure of a battery element. It is a plane schematic diagram which shows the structure of a battery element. It is a schematic block diagram of a winding apparatus. It is a schematic block diagram of a winding part. It is a block diagram which shows the electrical structure of a camera. It is a flowchart of a winding process. It is a flowchart of an imaging inspection process. It is a flowchart of an inspection process. It is a schematic diagram which shows the position etc. of the camera immediately after starting winding of various sheets. It is a schematic diagram which shows the position of the camera immediately before winding of various sheets is complete | finished. It is a schematic diagram of the image obtained with a camera. It is a schematic block diagram of the winding part when winding is started. It is a schematic block diagram of the winding part at the time of a separator sheet being cut | disconnected.

  Hereinafter, an embodiment will be described with reference to the drawings. First, the configuration of a lithium ion battery element as a winding element obtained by the winding device will be described.

  As shown in FIGS. 1 and 2, a lithium ion battery element 1 (hereinafter simply referred to as “battery element 1”) includes a positive electrode sheet 4 and a negative electrode sheet 5 via two separator sheets 2 and 3. It is manufactured by being wound in a superposed state. In the following description, the separator sheets 2 and 3 and the electrode sheets 4 and 5 may be collectively referred to as “various sheets 2 to 5”.

  Separator sheets 2 and 3 are in the form of strips having the same width, and in order to prevent different electrode sheets 4 and 5 from contacting each other to cause a short circuit, an insulating material such as polypropylene (PP) is used. It is comprised by. Separator sheets 2 and 3 are transparent or translucent. Therefore, the positive electrode sheet 4 and the negative electrode sheet 5 can be visually recognized through the separator sheets 2 and 3.

  The electrode sheets 4 and 5 are made of a thin metal sheet, and an active material is applied to both front and back surfaces. For example, an aluminum foil sheet is used as the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles) is applied to both the front and back surfaces. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon or the like) is applied to both the front and back surfaces.

  The electrode sheets 4 and 5 are electrode sheets in a continuous coating form, and predetermined portions in the sheet width direction become active material coating portions 4a and 5a (portions with a dotted pattern in FIG. 2), and the remaining portions. Are the active material non-coated portions 4b and 5b. And ion exchange between the positive electrode sheet 4 and the negative electrode sheet 5 can be performed through the active material coating parts 4a and 5a. More specifically, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5 side during charging, and ions move from the negative electrode sheet 5 side to the positive electrode sheet 4 side during discharging.

  The negative electrode sheet 5 is narrower than the separator sheets 2 and 3, and the positive electrode sheet 4 is narrower than the negative electrode sheet 5. In the battery element 1, the positive electrode sheet 4 is covered with the negative electrode sheet 5. Thereby, the malfunction accompanying the positive electrode sheet 4 not being covered with the negative electrode sheet 5 (for example, a needle-like deposit is formed in the positive electrode sheet 4, and the separator sheets 2 and 3 are damaged). The quality of the battery element 1 is improved.

  Furthermore, a plurality of positive leads (not shown) extend from one edge in the width direction of the positive electrode sheet 4, and a plurality of negative leads (not shown) extend from the other edge in the width direction of the negative electrode sheet 5.

  When obtaining a lithium ion battery, the battery element 1 is disposed in a battery container (case) (not shown) that is made of metal and has a cylindrical shape, and the positive electrode lead and the negative electrode lead are combined. Then, the combined positive lead is connected to a positive terminal component (not shown), and the same negative lead is connected to a negative terminal component (not shown), and both terminal components are open at both ends of the battery container. The lithium ion battery can be obtained by being provided so as to be closed.

  Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 10 includes a winding unit 11 for winding the various sheets 2 to 5, and a positive electrode sheet supply mechanism 31 for supplying the positive electrode sheet 4 to the winding unit 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding unit 11, separator supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding unit 11, respectively, and pass / fail judgment And a control device 81 as means. Various devices in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61 are controlled by a control device 81.

  The positive electrode sheet supply mechanism 31 includes a positive electrode sheet original fabric 32 in which the positive electrode sheet 4 is wound in a roll shape. The positive electrode sheet 32 is supported by a support shaft 33 that can be rotated by a driving means (not shown). With the rotation of the support shaft 33, the positive electrode sheet 4 is pulled out from the positive electrode sheet original fabric 32.

  The positive electrode sheet supply mechanism 31 includes a sheet insertion mechanism 71, a sheet cutting cutter 72, a tension applying mechanism 73, and a buffer mechanism 75.

  The sheet insertion mechanism 71 supplies the positive electrode sheet 4 to the winding unit 11, and approaches the winding unit 11 along the conveyance path of the positive electrode sheet 4, and is separated from the winding unit 11. It is configured to be movable between the separated positions. The sheet insertion mechanism 71 includes a pair of chucks 71 a and 71 b that can grip the positive electrode sheet 4. The chucks 71a and 71b are configured to be opened and closed by driving means (not shown). When the positive electrode sheet 4 is supplied to the winding unit 11, the sheet insertion mechanism 71 approaches the winding unit 11 side after the positive electrode sheet 4 is gripped by the chucks 71a and 71b. Yes.

  The sheet cutting cutter 72 is for cutting the positive electrode sheet 4 and includes a pair of blade portions 72 a and 72 b positioned on both the front and back sides of the positive electrode sheet 4. The sheet cutting cutter 72 is movable between a sheet cutting position where the pair of blade portions 72 a and 72 b sandwich the positive electrode sheet 4 and a retreat position where the positive electrode sheet 4 is retreated out of the conveyance path. It is configured.

  The positive electrode sheet 4 is cut while the positive electrode sheet 4 is held by the chucks 71a and 71b. Further, when the sheet insertion mechanism 71 moves closer to the winding unit 11 side to supply the positive electrode sheet 4 to the winding unit 11, the pair of blade parts 72 a and 72 b respectively transport the positive electrode sheet 4. By moving away from the path, the movement of the sheet insertion mechanism 71 is not hindered.

  The tension applying mechanism 73 includes a pair of rollers 73a and 73b and a dancer roller 73c provided so as to be swingable between the rollers 73a and 73b. The dancer roller 73c is configured to operate by a predetermined constant torque motor (not shown) and always apply a constant tension to the positive electrode sheet 4. By applying tension to the positive electrode sheet 4, the positive electrode sheet 4 is prevented from slackening.

  The buffer mechanism 75 temporarily stores the positive electrode sheet 4 sent out from the positive electrode sheet raw fabric 32. The buffer mechanism 75 includes a pair of driven rollers 75a and 75b, and an elevating roller 75c provided between the rollers 75a and 75b so as to be vertically displaceable. The up-and-down roller 75 c is displaced in the vertical position based on the storage amount of the positive electrode sheet 4.

  The negative electrode sheet supply mechanism 41 includes a negative electrode sheet original fabric 42 in which the negative electrode sheet 5 is wound in a roll shape on the most upstream side. The negative electrode sheet fabric 42 is supported by a support shaft 43 that can be rotated by a driving means (not shown). As the support shaft 43 rotates, the negative electrode sheet 5 is pulled out from the negative electrode sheet original fabric 42.

  Similarly to the positive electrode sheet supply mechanism 31, the negative electrode sheet supply mechanism 41 includes a sheet insertion mechanism 71, a sheet cutting cutter 72, a tension applying mechanism 73, and a buffer mechanism 75. These are the same as those provided in the positive electrode sheet supply mechanism 31 except that the negative electrode sheet 5 functions. Therefore, detailed description thereof will be omitted.

  On the other hand, the separator supply mechanisms 51 and 61 include separator sheets 52 and 62 in which separator sheets 2 and 3 are wound in a roll shape, respectively. Separator original fabrics 52 and 62 are supported in a freely rotatable state, from which separator sheets 2 and 3 are appropriately pulled out.

  Further, the separator supply mechanisms 51 and 61 are provided with a tension applying mechanism 73 as in the case of the electrode sheet supply mechanisms 31 and 41. The tension applying mechanism 73 is the same as that provided in the positive electrode sheet supply mechanism 31 except that it functions for the separator sheets 2 and 3. Therefore, detailed description thereof will be omitted.

  A pair of nip rollers 78a and 78b are provided in the middle of the conveyance paths of the various sheets 2 to 5. The nip rollers 78a and 78b are configured to stack the various sheets 2 to 5 so that the various sheets 2 to 5 are transported along the same transport path. Various types of sheets 2 to 5 that are stacked by the nip rollers 78 a and 78 b are supplied to the winding unit 11.

  In addition, the rotation amount of the nip rollers 78a and 78b (in this embodiment, the rotation amount of the nip roller 78b) can be grasped by a nip roller encoder (not shown). Information on the rotation amount of the nip roller 78b is input to the control device 81 from the nip roller encoder. The rotation amount of the nip roller 78b corresponds to the feed amount of the various sheets 2-5.

  Next, the structure of the winding part 11 is demonstrated. As shown in FIG. 4, the winding part 11 includes a turret 12 composed of two opposing disk-like tables that are rotatably provided by a drive mechanism (not shown), and an interval of 180 ° in the rotation direction of the turret 12. The two cores 13 and 14, the chuck portions 15a and 15b, the separator cutter 16, the press roller 17 for suppressing the various sheets 2 to 5 after winding, and predetermined fixing. And a tape attaching mechanism 18 for attaching a tape for use.

  The winding cores 13 and 14 are for winding the various sheets 2 to 5 on the outer peripheral side of the winding cores 13 and 14, respectively, and are configured to be rotatable about their own central axis as a rotation axis by a driving mechanism (not shown). The rotation angle and the rotation amount of the winding cores 13 and 14 can be detected by a winding core encoder 82 (see FIG. 5) as a rotation angle detecting means. Information about the rotation angle and the rotation amount is input to the control device 81.

  Further, the winding cores 13 and 14 are provided so as to be capable of appearing and retracting with respect to one table constituting the turret 12 along the axial direction of the turret 12 (the depth direction in FIG. 4). When the cores 13 and 14 protrude from the one table, the leading ends thereof are inserted into receiving holes formed in the other table, and can be rotated by both tables. It has come to be supported.

  In addition, each of the winding cores 13 and 14 is configured such that the outline is non-circular in a cross section orthogonal to the rotation axis. In the present embodiment, the winding cores 13 and 14 have an elliptical shape in a cross section orthogonal to their own rotation axis.

  Further, the winding core 13 (14) includes a pair of core pieces 13a and 13b (14a and 14b) extending along its own axial direction (the depth direction in FIG. 4). A gap 13c (14c) is formed between the core pieces 13a and 13b (14a and 14b).

  Further, the winding cores 13 and 14 are configured to be capable of turning between the winding position P1 and the removal position P2 when the turret 12 rotates.

  The winding position P1 is a position where the various sheets 2 to 5 are wound by the winding cores 13 and 14. Various sheets 2 to 5 are supplied from the supply mechanisms 31, 41, 51 and 61 to the winding position P1.

  The removal position P2 is a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. In the periphery of the removal position P2, a removal device (not shown) for removing the battery element 1 from the winding cores 13 and 14 is provided.

  The chuck portions 15a and 15b are for sandwiching the separator sheets 2 and 3 between the winding position P1 and the removal position P2. The chuck portions 15a and 15b are configured to be pivotable about a rotation axis parallel to the rotation axes of the turret 12 and the cores 13 and 14 by a driving means (not shown). The chuck portions 15a and 15b are movable between a clamping position and a retracted position, respectively. When the chuck portions 15a and 15b are moved to the clamping positions, respectively, the separator sheets 2 and 3 disposed from the nip rollers 78a and 78b to the position P2 can be clamped by the chuck portions 15a and 15b (see FIG. 12). On the other hand, when the chuck portions 15a and 15b are respectively moved to the retracted positions, the chuck portions 15a and 15b are arranged at positions that do not hinder the movement of the cores 13 and 14, the separator sheets 2 and 3, and the like (see FIG. 3).

  The separator cutter 16 is disposed between the winding position P1 and the removal position P2, and is provided closer to the removal position P2 than the chuck portions 15a and 15b. The separator cutter 16 can reciprocate in a vertical direction between a predetermined upper position and a lower position, and cuts the separator sheets 2 and 3 by moving from the upper position to the lower position.

  The presser roller 17 is disposed in the vicinity of the removal position P2, and is located near the turret 12 and presses the various sheets 2 to 5, and a retreat position that is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is configured to be movable between.

  The tape sticking mechanism 18 is disposed in the vicinity of the removal position P2, and sticks the fixing tape to the end portions of the separator sheets 2 and 3 at the end of winding. By sticking the fixing tape, the battery element 1 is wound.

  Further, the winding unit 11 includes lighting devices 19a and 19b as irradiation means and a camera 20 as imaging means. The illuminating devices 19a and 19b and the camera 20 are disposed corresponding to the winding position P1, respectively.

  The illuminating devices 19a and 19b are provided with a predetermined light (for example, a part of the various sheets 2 to 5 to be inspected including the edges in the width direction wound around the cores 13 and 14 positioned at the winding position P1. , Visible light such as red light and infrared light). In addition, it is preferable to irradiate red light or infrared light having a property of transmitting through the separator sheets 2 and 3 in that the various sheets 2 to 5 are imaged more clearly by the camera 20.

  The illuminating devices 19a and 19b irradiate light at least at a position shifted from the rotation axis of the cores 13 and 14 by less than the minor axis of the cores 13 and 14. Thereby, during the winding of the various sheets 2-5 by the winding cores 13 and 14, the various sheets 2-5 can always be illuminated. It should be noted that light is irradiated to a position shifted from the rotation axis of the cores 13 and 14 by not less than the minor axis and less than the major axis of the cores 13 and 14 so that various sheets can be illuminated at least at the imaging timing by the camera 20. May be.

  The camera 20 has sensitivity in the wavelength region of light emitted from the illumination devices 19a and 19b, and images at least various sheets 2 to 5 (inspection objects) illuminated by the illumination devices 19a and 19b. It is.

  In the present embodiment, two sets of the lighting devices 19a and 19b and the camera 20 are provided, one set is provided corresponding to one edge of the various sheets 2 to 5 in the width direction, and the other set is various types. It is provided corresponding to the other edge in the width direction of the sheets 2 to 5.

  Furthermore, in the imaging range by the camera 20, the positive electrode sheet 4 is located on the outermost periphery, the separator sheet 3 is located below it, the negative electrode sheet 5 is located below it, and the separator sheet 2 is located below it. It is in a state. Accordingly, at least the positive electrode sheet 4, the separator sheet 3, the negative electrode sheet 5 that is visible through the separator sheet 3, and the separator sheet 2 are imaged at a time by the camera 20.

  As shown in FIG. 5, the camera 20 includes a lens 21, an image sensor 22, a trigger signal output unit 23, an image memory 24, a calculation unit 26, and an output unit 27.

  The lens 21 collects light reflected from the various sheets 2 to 5 among the light emitted from the illumination devices 19 a and 19 b and forms an image on the image sensor 22. The lens 21 may be a general lens or a telecentric lens.

  The imaging element 22 converts light that has passed through the lens 21 into an electrical signal, and is configured by, for example, a CMOS image sensor or a CCD image sensor.

  The trigger signal output unit 23 outputs a trigger signal to the image sensor 22. Each time the trigger signal is output, the image sensor 22 is exposed, and images (image data) relating to the various sheets 2 to 5 are output from the image sensor 22 to the image memory 24. The obtained image includes at least the positive electrode sheet 4, the separator sheet 3, the negative electrode sheet 5 captured through the separator sheet 3, and the separator sheet 2 (see FIG. 11). However, since the edge portions 2E and 3E (edges in the width direction) of the separator sheets 2 and 3 usually overlap, the separator sheet 2 may not be discriminated in the image. In the present embodiment, the depth of field in the camera 20 is configured to be relatively shallow, and the obtained image has a relatively high resolution, that is, a relatively high measurement resolution. .

  In addition, an imaging signal described later is input to the camera 20 from the control device 81, and a trigger signal is output from the trigger signal output unit 23 when the imaging signal is input. That is, every time an imaging signal is input from the control device 81, imaging is performed, and the obtained image is output to the image memory 24.

  The image memory 24 stores the image input from the image sensor 22. In the present embodiment, one sheet of image is obtained and the one image is stored in the image memory 24 while the cores 13 and 14 rotate once during the winding of the various sheets 2 to 5. A plurality of images may be obtained while the cores 13 and 14 make one rotation, and these images may be stored in the image memory 24.

  The calculation unit 26 sends the image stored in the image memory 24 to the output unit 27. When a plurality of images are obtained while the cores 13 and 14 are rotated once, the calculation unit 26 selects one image satisfying a predetermined condition from the plurality of images, and then selects the selected one image. It may be sent to the output unit 27.

  The output unit 27 transmits an image to the control device 81. In the present embodiment, the number of images sent from the output unit 27 to the control device 81 is equal to or less than the number of rotations of the cores 13 and 14 when the various sheets 2 to 5 are wound. For this reason, it is not necessary to use a special line having excellent processing capability and communication capability as a transmission path connecting the output unit 27, the output unit 27, and the control device 81.

  In addition, the camera 20 is attached to a ball screw (not shown) extending in parallel with the optical axis OP (see FIG. 4) of the lens 21, and the ball screw is rotated by driving a servo motor (not shown). As a result, the camera 20 is moved relative to the cores 13 and 14 located at the winding position P1 along the optical axis OP direction of the lens 21 by driving the servo motor.

  The camera 20 is arranged at a preset initial position at least immediately before the start of winding of the various sheets 2 to 5 on the cores 13 and 14. The camera 20 disposed at the initial position is in a state where the outer peripheral surfaces of the cores 13 and 14 are in focus.

  Further, the servo motor is controlled by the control device 81 to control the movement of the camera 20. In the present embodiment, when a predetermined movement start signal is input from the control device 81, the servo motor causes the winding cores 13 and 14 to rotate at the respective rotations of the winding cores 13 and 14 from the winding start to the winding end. The camera 20 is driven to move by a certain amount corresponding to the thickness of the various sheets 2 to 5 wound while the rollers 13 and 14 are rotated once. At this time, the servo motor continuously moves the camera 20 away from the cores 13 and 14 at a constant speed (without temporarily stopping). Thereby, during the winding of the various sheets 2 to 5 on the cores 13 and 14, the various sheets wound around the cores 13 and 14 so that the various sheets 2 to 5 positioned on the outermost periphery are in focus. The camera 20 moves according to the thickness of 2-5.

  When a predetermined movement stop signal is input from the control device 81, the servo motor stops the movement of the camera 20. In addition, when a predetermined position reset signal is input from the control device 81, the servo motor resets the position of the camera 20 to the initial position.

  Next, the control device 81 will be described. The control device 81 includes a CPU as a calculation means, a ROM that stores various programs, a RAM that temporarily stores various data such as calculation data and input / output data, and a hard disk that stores calculation data and the like for a long time. . As described above, the control device 81 controls the operation of various devices in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61. In the present embodiment, the lighting devices 19a and 19b, the camera 20, the control device 81, and the winding core encoder 82 constitute an inspection device 100 for inspecting the battery element 1.

  The control device 81 operates as follows when winding the various sheets 2 to 5. That is, the control device 81 starts the winding process of the various sheets 2 to 5 and each time the rotation angle of the cores 13 and 14 winding the various sheets 2 to 5 becomes a predetermined constant angle. The imaging signal is output to the camera 20.

  An image is input from the camera 20 to the control device 81 along with the output of the imaging signal. The control device 81 performs an inspection on misalignment of the various sheets 2 to 5 based on the image sent from the camera 20. A specific method of inspection will be described later.

  Further, the control device 81 outputs a movement start signal to the servo motor when starting the winding of the various sheets 2 to 5, thereby moving the camera 20 away from the cores 13 and 14. Then, the control device 81 outputs the movement stop signal and the position reset signal to the servo motor when the positive electrode sheet 4 is wound around the winding cores 13 and 14 by a predetermined amount. Stop and move to the initial position. However, when the control device 81 determines that the various sheets 2 to 5 are defective as will be described later, the control device 81 outputs a movement stop signal and a position reset signal before the positive electrode sheet 4 is wound by a predetermined amount. .

  Next, the winding process of the various sheets 2-5 by said winding apparatus 10 is demonstrated. Prior to the winding step, the separator sheets 2 and 3 are arranged in advance in the gap 13c (14c) in one of the cores 13 (14), and the separator sheets 2 and 3 are connected to the chuck portions 15a and 15b. (See FIG. 12).

  In the winding process, as shown in FIG. 6, first, in step S11, one of the cores 13 (14) is rotated by a predetermined number, whereby the separator sheets 2 and 3 are rotated with respect to the one core 13 (14). Is wound up by a predetermined amount. Thereafter, the chuck portions 15a and 15b are moved to the retracted positions, respectively.

  Next, in step S <b> 12, the negative electrode sheet 5 is supplied to the one core 13 (14) side by the sheet insertion mechanism 71 of the negative electrode sheet supply mechanism 41. Specifically, the sheet insertion mechanism 71 that holds the negative electrode sheet 5 approaches the winding part 11 side, and the negative electrode sheet 5 is inserted between the separator sheets 2 and 3, thereby supplying the negative electrode sheet 5. Is done. After the insertion, the holding of the negative electrode sheet 5 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  In the subsequent step S13, after the negative electrode sheet 5 is supplied, when one of the cores 13 (14) rotates a predetermined number of times (for example, one rotation), the sheet insertion mechanism 71 moves the one core 13 (14) to the one core 13 (14) side. On the other hand, the positive electrode sheet 4 is supplied. Specifically, the sheet insertion mechanism 71 that holds the positive electrode sheet 4 approaches the winding unit 11 side, and the positive electrode sheet 4 is inserted between the separator sheets 2 and 3, thereby supplying the positive electrode sheet 4. Is done. Note that after the insertion, the holding of the positive electrode sheet 4 by the sheet insertion mechanism 71 is released, and the sheet insertion mechanism 71 returns to the original position.

  Next, in step S14, an imaging inspection process is executed. In the imaging inspection process, as shown in FIG. 7, first, in step S31, one core 13 (14) is controlled to rotate at a constant speed, and various sheets 2 to 5 are wound.

  Next, in step S32, a movement start signal is output from the control device 81 to the servo motor. Thereby, the camera 20 moves at a constant speed so as to move away from the one core 13 (14).

  After step S32, in step S33, it is determined whether or not the feed amount of the positive electrode sheet 4 has reached a predetermined amount set in advance. That is, it is determined whether or not the end condition of the imaging inspection process is satisfied. As the feed amount of the positive electrode sheet 4, the feed amounts of the various sheets 2 to 5 acquired from the winding start, which are obtained by the nip roller encoder, are used. This predetermined amount corresponds to the length of the positive electrode sheet 4 constituting one battery element. When the positive electrode sheet 4 is sent to the cores 13 and 14 by the predetermined amount, the terminal portion of the positive electrode sheet 4 for one element is placed in correspondence with the sheet cutting cutter 72.

  If an affirmative determination is made in step S33, the process proceeds to step S40 because it is the end timing of the imaging inspection process. On the other hand, if a negative determination is made in step 33, one of the cores 13 (14) is based on the rotation angle of one of the cores 13 (14) output from the core encoder 82 in step S34. It is determined whether or not the rotation angle is a predetermined constant angle.

  If a negative determination is made in step S34, the timing returns to step S33 because it is not the execution timing of imaging by the camera 20. On the other hand, when an affirmative determination is made in step S <b> 34, the process proceeds to step S <b> 35 in order to execute imaging by the camera 20, and an imaging signal is output from the control device 81 to the camera 20. As a result, the various sheets 2 to 5 being wound are imaged by the camera 20. In addition, an image obtained by imaging is input from the camera 20 to the control device 81.

  In the subsequent step S36, an inspection process is executed. In the inspection process, as shown in FIG. 8, first, in step S101, based on the input image, the edge part 3E (width direction edge part) of the separator sheet 3, the edge part 2E of the separator sheet 2, the positive electrode sheet 4 and the edge part 5E of the negative electrode sheet 5 are extracted (see FIG. 11). When the edge portions 2E and 3E overlap and the edge portion 2E cannot be extracted, the edge portion 3E is handled as the edge portion 2E.

  In the subsequent step S102, based on the input image, the active material coating part 4a and the boundary part 4T of the active material non-coating part 4b in the positive electrode sheet 4, and the active material coating part 5a in the negative electrode sheet 5 and The boundary portion 5T of the active material non-coated portion 5b is extracted (see FIG. 11).

  Next, in step S103, various distances are calculated based on the edge portions 2E, 3E, 4E, 5E and the boundary portions 4T, 5T extracted in steps S101, 102. That is, the amount of misalignment of the various sheets 2 to 5 wound around the one core 13 (14) is calculated.

  Specifically, with reference to the edge portion 3E, the distance L1 to the boundary portion 4T in the sheet width direction, the distance L2 to the edge portion 4E in the sheet width direction, and the distance L3 to the boundary portion 5T in the sheet width direction A distance L4 to the edge portion 5E in the sheet width direction and a distance (not shown) to the edge portion 2E in the sheet width direction are calculated (see FIG. 11).

  Thereafter, in step S104, it is determined whether or not each distance is within a preset allowable range based on each distance calculated in step S103.

  Here, when it is determined that any one of the distances is not within the allowable range, that is, the winding deviation in the various sheets 2 to 5 and the application position deviation of the active material coating portions 4a and 5a have occurred. If conceivable, it is determined to be defective in step S105, and the inspection process is terminated.

  On the other hand, if it is determined in step S104 that all of the distances are within the allowable range, it is determined that the distance is acceptable in step S106, and the inspection process is terminated.

  Returning to FIG. 7, after executing the inspection process in step S <b> 36, the process proceeds to step S <b> 37 and it is determined whether or not a good determination is made in the immediately preceding inspection process. If a negative determination is made in step S37, that is, if a defect is determined in the inspection process, the process proceeds to step S38, and the rotation of the cores 13 and 14 is stopped, so that the various sheets 2 to 5 are stopped. Winding is stopped halfway. Then, in step S39, the battery element 1 in the middle of winding is determined as a defective product, and the process proceeds to step S42.

  On the other hand, if a positive determination is made in step S37, the process returns to step S33. As described above, in the imaging inspection process, the inspection process in step S36 is repeatedly performed until the defect determination is not made in the inspection process until the feed amount of the positive electrode sheet 4 reaches a predetermined amount. As a result, the inspection process is executed for each of the plurality of images.

  Moreover, as shown in FIG.9 and FIG.10, winding of the various sheets 2-5 progresses, and the total thickness of the various sheets 2-5 wound around one core 13 (14) increases. Thus, the camera 20 gradually moves in the direction away from the one core 13 (14) along the optical axis OP direction. As a result, every time the rotation angle of one of the cores 13 (14) becomes a constant angle, the distance from the outermost wound portion of the various sheets 2 to 5 to the camera 20 becomes almost constant, and the camera 20 Various sheets 2 to 5 are in a range R in focus. Therefore, an in-focus image is acquired at each rotation of one of the cores 13 (14), and an inspection process is performed on the plurality of in-focus images.

  When the inspection process is smoothly performed and the feed amount of the positive electrode sheet 4 reaches a predetermined amount (step S33: YES), the process proceeds to step S40, and the rotation of one of the winding cores 13 and 14 is stopped. Next, in step S41, the battery element 1 composed of the various sheets 2 to 5 in the middle of winding is determined as a non-defective product, and the process proceeds to step S42.

  In step S42, the camera 20 is stopped by outputting a movement stop signal from the control device 81 to the servo motor. In step S43, a position reset signal is output to the servo motor, so that the camera 20 returns to the initial position, and the imaging inspection process ends.

  Returning to FIG. 6, after the imaging inspection process of step S <b> 14 is performed, the positive electrode sheet 4 is gripped by the sheet insertion mechanism 71 and the positive electrode sheet 4 is cut by the sheet cutting cutter 72 in step S <b> 15. The In addition, if the battery element 1 in the middle of winding is determined to be a non-defective product in the imaging inspection process, it is cut at the terminal portion of the positive electrode sheet 4 for one element. On the other hand, if the battery element 1 in the middle of winding is determined as a defective product in the imaging inspection process, the positive electrode sheet 4 is cut at a position before the end portion.

  In a succeeding step S16, it is determined whether or not the non-defective product determination is performed in the imaging inspection process. If an affirmative determination is made in step S16, the rotation of one of the cores 13 (14) is resumed, and then the process proceeds to step S17.

  On the other hand, if a negative determination is made in step S16, the process proceeds to step S18 without resuming the rotation of the one core 13 (14). That is, when the battery element 1 in the middle of winding is determined to be defective, the negative electrode sheet 5 is prevented from being actively supplied any more.

  In step S17, the determination as to whether or not the feed amount of the negative electrode sheet 5 from the start of supply has reached a predetermined amount is repeated until the condition is satisfied. This predetermined amount corresponds to the length of the negative electrode sheet 5 constituting one battery element. The feed amount of the negative electrode sheet 5 is derived based on the feed amounts of the various sheets 2 to 5 acquired by the nip roller encoder. When an affirmative determination is made in step S17, that is, when the terminal portion of the negative electrode sheet 5 currently wound for one element reaches the sheet cutting cutter 72, the rotation of one of the cores 13 (14) is performed. Is temporarily stopped, and then the process proceeds to step S18.

  In step S <b> 18, the negative electrode sheet 5 is gripped by the sheet insertion mechanism 71, and then the negative electrode sheet 5 is cut by the sheet cutting cutter 72.

  Next, in step S19, by terminating the rotation of one of the cores 13 (14), the terminal portions (remaining portions) of the electrode sheets 4 and 5 are wound up.

  In step S20 following step S19, the turret 12 is rotated counterclockwise without the separator sheets 2 and 3 being cut. As a result, one core 13 (14) at the winding position P1 moves to the removal position P2 side while pulling out the separator sheets 2 and 3 from the separator supply mechanisms 51 and 61. On the other hand, the other core 14 (13) at the removal position P2 is moved to the winding position P1 side while being immersed in one table of the turret 12.

  Subsequently, in step S <b> 21, one core 13 (14) around which the various sheets 2 to 5 are wound is rotated in accordance with the rotation of the turret 12.

  Then, in the next step S22, the winding process is completed by executing the winding end process.

  In the end-of-winding process, first, when the amount of rotation of one of the cores 13 (14) from when the negative electrode sheet 5 is cut, which is grasped by the core encoder 82, reaches a predetermined amount, one of the cores. The rotation of 13 (14) is stopped. The rotation of the turret 12 is stopped before the rotation of the one core 13 (14) is stopped, simultaneously with the stop or after the stop.

  When the rotation of one of the cores 13 (14) and the turret 12 is stopped, one of the cores 13 (14) at the winding position P1 is positioned at the removal position P2 and the other of the cores 13 (14) at the removal position P2 The winding core 14 (13) is in a state of being positioned at the winding position P1.

  In this state, the press roller 17 is moved closer to the one core 13 (14), whereby the various sheets 2 to 5 are pressed by the press roller 17. Further, the separator sheets 2 and 3 are held between the positions P1 and P2 by moving the chuck portions 15a and 15b from the retracted position to the clamping position. Then, when the separator cutter 16 approaches the separator sheets 2 and 3, the separator sheets 2 and 3 are cut (see FIG. 13).

  Further, the other core 14 (13) protrudes from one table of the turret 12, whereby the separator sheets 2 and 3 are disposed in the gap 14c (13c) of the other core 14 (13). In the next winding step, the other core 14 (13) rotates by a predetermined amount, so that the separator sheets 2 and 3 are wound around the outer periphery by a predetermined amount. The electrode sheets 4 and 5 are supplied to the other core 14 (13) around which the separator sheets 2 and 3 are wound.

  After the separator sheets 2 and 3 are cut, one of the cores 13 (14) is rotated while the various sheets 2 to 5 are pressed by the pressing roller 17. Thus, the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are completely wound up without being scattered. Thereafter, the tape applying mechanism 18 stops the end portions of the separator sheets 2 and 3 with the fixing tape, and the winding end process is completed. The battery element 1 that has been wound is removed from the one core 13 (14) by the removing device. And the battery element 1 determined to be non-defective is sent out to a regular line. On the other hand, the battery element 1 determined to be defective is sent out to a predetermined defective product discharge mechanism.

  As described above in detail, according to the present embodiment, the control device 81 determines pass / fail for the various sheets 2 to 5 that are actually wound. By performing the pass / fail determination on the various sheets 2 to 5 that are actually wound, the pass / fail regarding the quality of the battery element 1 can be more accurately determined.

  Further, the camera 20 is movable relative to the cores 13 and 14 along the optical axis OP direction of the lens 21, and the various sheets 2 to 5 are in focus during the winding of the various sheets 2 to 5. According to the thickness of the various sheets 2-5 wound around the cores 13 and 14, the relative movement is performed along the optical axis OP direction. Specifically, immediately after the start of winding of the various sheets 2 to 5 and when the various sheets 2 to 5 wound around the cores 13 and 14 are thin, the camera 20 has a distance to the cores 13 and 14. The various sheets 2 to 5 are imaged at a relatively small position. On the other hand, as the various sheets 2 to 5 are wound, the various sheets 2 to 5 wound around the cores 13 and 14 are thick (the amount of the various sheets 2 to 5 is increased). The camera 20 images various sheets 2 to 5 at a position where the distance from the cores 13 and 14 is relatively large. Accordingly, it is possible to focus on the various sheets 2 to 5 more reliably while reducing the depth of field and increasing the measurement resolution. In other words, it is possible to obtain the same effect as in the case of simultaneously realizing both the measurement resolution and the depth of field (widening the in-focus range) in a trade-off relationship. it can. As a result, the reliability related to the inspection can be sufficiently increased.

  Further, when the camera 20 is moved, the variation in the diameters of the various sheets 2 to 5 during winding is relatively long between the start of winding and the end of winding, such as when the battery element 1 is large. It is possible to cope with a case where it becomes large. Therefore, it is possible to accurately inspect battery elements 1 of various sizes.

  In addition, the camera 20 continuously moves while the various sheets 2 to 5 are wound. Therefore, it is possible to effectively suppress the occurrence of vibration in the camera 20 as compared with the case where the movement and pause are alternately repeated in the camera 20. As a result, an in-focus image can be obtained more reliably with respect to the various sheets 2 to 5, and the reliability related to the inspection can be further enhanced. Furthermore, the control relating to the movement of the camera 20 is facilitated, and the burden on the control process can be reduced. In particular, in this embodiment, since the camera 20 moves at a constant speed, it is possible to more effectively reduce the burden on the control processing.

  In addition, every time the winding cores 13 and 14 are at a certain rotation angle, the various sheets 2 to 5 are imaged by the camera 20. Therefore, the control related to the imaging timing becomes easy, and the burden on the control processing can be further reduced.

  Moreover, according to this embodiment, the electrode sheets 4 and 5 and the separator sheets 2 and 3 can be imaged at once. Accordingly, an image necessary for inspection can be obtained with a small number of imaging operations, and inspection efficiency can be improved.

  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 camera 20 is configured to move at a constant speed during the winding of the various sheets 2 to 5, but does not necessarily have to move at a constant speed. Therefore, for example, the light of the various sheets 2 to 5 wound around the cores 13 and 14 at the time of each rotation of the cores 13 and 14 from the start of winding of the various sheets 2 to 5 with respect to the control device 81. Information relating to the thickness variation along the axis OP direction is input in advance, and the camera 20 moves by the thickness variation corresponding to the rotation of each of the winding cores 13 and 14. You may comprise as follows. In this case, the camera 20 can be more reliably focused on the various sheets 2 to 5, and a clearer image can be obtained. As a result, the reliability related to the inspection can be further increased. In addition, the information regarding the thickness variation amount can be obtained by, for example, calculation based on the information regarding the thicknesses of the various sheets 2 to 5.

  (B) In the above embodiment, the movement of the camera 20 is started at the start of the rotation of the cores 13 and 14, but the camera 20 is moved before the rotation of the cores 13 and 14 is started. It may be configured to start. In this case, since the time from the start of movement of the camera 20 to the start of imaging can be made longer, the vibration of the camera 20 caused by the start of movement can be more reliably suppressed before the start of imaging by the camera 20. be able to. As a result, a clear and focused image can be obtained more reliably, and the reliability of inspection can be further increased.

  (C) In the above embodiment, the camera 20 is configured to move continuously, but may be configured to move intermittently. For example, the camera 20 may be configured to move by a predetermined amount every time the cores 13 and 14 rotate by a preset number of rotations.

  (D) In the above-described embodiment, the inspection is performed on the winding deviation of the various sheets 2 to 5 and the application position deviation of the active material coating portions 4a and 5a based on the obtained images, but the inspection items are limited to these. Is not to be done. Therefore, for example, when providing a tab with respect to the electrode sheets 4 and 5, based on the obtained image, you may inspect about the position of the tab along the width direction of the electrode sheets 4-5. As a tab, the welding tab welded to the active material non-coating part 4b, 5b in the electrode sheets 4 and 5 and the notch formed by providing an incision intermittently in the width direction one end part of the electrode sheets 4 and 5 There are tabs. Of course, you may test | inspect about another item based on the obtained image. Since any inspection item is inspected based on an in-focus image, the reliability related to the inspection can be sufficiently increased.

  (E) In the above embodiment, an image is output from the camera 20 to the control device 81, and the control device 81 determines the quality of the various sheets 2 to 5 based on this image. On the other hand, the camera 20 (for example, the calculation unit 26) determines the quality of the various sheets 2 to 5 based on the obtained image, and outputs information regarding the determination results of the various sheets 2 to 5 to the control device 81. You may comprise as follows. In this case, the amount of data transmitted from the camera 20 to the control device 81 can be made smaller, and the processing load can be reduced.

  (F) In the above embodiment, the pass / fail determination is performed based on the relative positions of the various sheets 2 to 5, but the pass / fail determination may be performed based on the absolute positions of the various sheets 2 to 5. In this case, the absolute positions of the various sheets 2 to 5 may be obtained using, for example, marks attached to the cores 13 and 14.

  Moreover, you may comprise so that a quality determination may be performed by comparing several images. For example, when the image obtained immediately after the start of winding of the various sheets 2 to 5 and the image obtained immediately before the end of winding of the various sheets 2 to 5 are compared, in the width direction of the various sheets 2 to 5 When the amount of variation in the positions of the various sheets 2 to 5 along is large, it may be determined that the various sheets 2 to 5 are wound obliquely with respect to the rotation axes of the cores 13 and 14 and are defective. By comprising in this way, the grade of the whole position fluctuation in various sheets 2-5 can be grasped, and the quality of battery element 1 can be judged more correctly.

  (G) In the said embodiment, it is comprised so that the separator sheets 2 and 3 and both the electrode sheets 4 and 5 may be supplied to the cores 13 and 14 through the same conveyance path | route, respectively. And it is comprised so that the separator sheets 2 and 3 and both the electrode sheets 4 and 5 may be imaged at once. On the other hand, one of the separator sheets 2 and 3 and one of the electrode sheets 4 and 5 and the other of the separator sheets 2 and 3 and the other of the electrode sheets 4 and 5 pass through separate transport paths. You may comprise so that it may be supplied to a core. In this case, one of the separator sheets 2 and 3 wound around the core and one of the electrode sheets 4 and 5 and the other and both of the separator sheets 2 and 3 wound around the core. You may comprise so that the other of the electrode sheets 4 and 5 may be imaged separately. That is, in the above embodiment, four sheets are imaged at a time, but the two sheets may be separately imaged.

  (H) The camera 20 may be movable in a direction orthogonal to the optical axis OP direction (Z-axis direction). For example, the camera 20 may be movable along the width direction (Y-axis direction) of the various sheets 2 to 5 orthogonal to the optical axis OP, or along the direction orthogonal to the width direction (X-axis direction). It may be movable. In this case, the imaging position by the camera 20 can be easily adjusted. Therefore, it can respond flexibly to changes in the various sheets 2 to 5 and the cores 13 and 14.

  (I) In the above-described embodiment, as the cores 13 and 14, those in which the outer peripheral shape around which the various sheets 2 to 5 are wound are configured in an elliptical shape are employed, but the shapes of the cores 13 and 14 are It is not limited to this. Therefore, for example, a winding core having a circular shape, a rectangular shape (flat shape), a polygonal shape, an oval shape, or the like may be employed.

  (J) The materials of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are not limited to those described in the above embodiment. For example, in the above embodiment, the separator sheets 2 and 3 are made of PP, but the separator sheets 2 and 3 may be made of other insulating materials. Further, for example, the active material applied to the electrode sheets 4 and 5 may be appropriately changed.

  (K) In the above embodiment, the winding part 11 is configured to include two cores 13 and 14, but the number of cores is not limited to this, and three or more windings are provided. It is good also as a structure provided with the core. When there is one winding core, the turret 12 and the like can be omitted.

  (L) In the above-described embodiment, the various sheets 2 to 5 are directly wound around the outer periphery of the rotatable cores 13 and 14, but the rotatable shaft portion and the outer periphery of the shaft portion. The core may be constituted by a cylindrical core disposed at the center, and various sheets 2 to 5 may be wound around the outer peripheral surface of the core.

  DESCRIPTION OF SYMBOLS 1 ... Battery element (winding element), 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding device, 13, 14 ... Core, 19a, 19b ... Illumination device (irradiation) Means), 20 ... Camera (imaging means), 21 ... Lens, 81 ... Control device (quality determination means), 82 ... Core encoder (rotation angle detection means), 100 ... Inspection device.

Claims (5)

A winding manufactured by winding a belt-like positive electrode sheet coated with an active material and a negative electrode sheet alternately with a rotatable core through a belt-like separator sheet made of an insulating material. An inspection device used in the manufacturing process of a rotating element,
Irradiation means for irradiating the inspection object with predetermined light, with each sheet wound around the core as an inspection object;
An imaging unit having a predetermined lens and imaging the inspection object irradiated with light by the irradiation unit;
Based on the image obtained by the imaging means, and a quality determination means for determining the quality of the inspection object,
The imaging means is movable relative to the core along the optical axis direction of the lens, and the winding is performed so that the inspection object is in focus while each sheet is wound around the core. An inspection apparatus configured to move relative to the core in accordance with the thickness of each sheet wound around the core.   The inspection apparatus according to claim 1, wherein the imaging unit is configured to continuously move relative to the core while each sheet is wound around the core. A rotation angle detecting means capable of detecting the rotation angle of the winding core;
The imaging means is configured to take an image of the inspection object every time the rotation angle of the core detected by the rotation angle detection means becomes a predetermined constant angle. Item 3. The inspection device according to Item 1 or 2. The separator sheet is transparent or translucent,
The imaging means is configured to image both the electrode sheets and the separator sheet at a time by imaging at least one of the both electrode sheets through the separator sheet. The inspection apparatus according to any one of claims 1 to 3.   A winding device comprising the inspection device according to any one of claims 1 to 4.

Images