JP4595500B2 - Winding device and winding deviation inspection method - Google Patents

Description

  The present invention relates to a part or product produced by winding a strip-shaped or strip-shaped sealing material, such as an electrode of a lithium ion battery or a film capacitor, so that winding misalignment between winding layers is detected on the core of the winding device. The present invention relates to a winding device having a function of detecting by measuring image processing and a winding deviation inspection method.

  In recent years, with the development of portable electronic devices such as notebook computers, mobile phones, and PDAs (Personal Digital Assistants), the demand for batteries has been rapidly increasing, and the use of batteries has been expanded. Under such circumstances, the battery design is moving toward higher energy density of the battery capacity, and further reduction in size and weight is required.

  Lithium ion batteries are widely used as batteries that meet these requirements. Lithium ion batteries can be produced in various shapes, such as cylindrical and rectangular, depending on the application, all of which are laminated layers of positive electrode members, negative electrode members, and separators alternately stacked A battery element is manufactured by a so-called winding method in which an electrode body is wound around a winding core.

  In order to produce such a wound type electrode, first, the positive and negative electrode strips formed in a band shape with a predetermined width are cut into strips using an electrode cutting device. Next, a wound body (battery element) is obtained by winding a laminated electrode in which the positive electrode, the separator, the negative electrode, and the separator are stacked in this order by a predetermined number of times using a winding device.

  In general, for the purpose of preventing short-circuiting between electrodes, the widths of the positive electrode, the negative electrode, and the separator used in the wound body are different from each other. By making the separator wider than the positive electrode and the negative electrode, the positive electrode and the negative electrode Are configured not to contact each other.

  However, the positive electrode and / or the negative electrode may protrude from the winding end of the separator during winding. For this reason, it is necessary to inspect the quality of the finished wound body.

  FIG. 1 shows an example of a winding device, a winding deviation inspection device, and a winding deviation inspection process.

  The conventional winding device 9 includes, for example, raw materials R1, R2, R3, and R4 around which a positive electrode 1, a separator S1, a negative electrode 2, and a separator S2 are wound, a positive electrode 1, a separator S1, a negative electrode 2, and a separator S2. An EPC (Edge Position Control) unit 5a, 5b, 5c, 5d (hereinafter referred to as an EPC unit 5 as appropriate when it does not represent a specific EPC unit) and a core 6 are configured.

  The EPC unit 5 includes a detection unit indicated by reference numerals 3a, 3b, 3c, and 3d (hereinafter appropriately referred to as the detection unit 3 when a specific detection unit is not represented), and reference numerals 4a, 4b, 4c, and 4d. (Hereinafter, when a specific tilt roller is not represented, it is appropriately referred to as a tilt roller 4). The detection unit 3 is a part for detecting whether or not the separators and the ends (edges) of the electrodes are deviated from a predetermined reference position. When the edge deviates from the target position, the inclination of the inclination roller 4 is changed, and control is performed so that the edge becomes the target position.

  After controlling each edge of the positive electrode 1, the separator S 1, the negative electrode 2, and the separator S 2 to be a target position, the four electrodes are laminated to form a laminated electrode body and wound around the core 6. The winding core 6 is rotated a predetermined number of times to produce a wound body 7.

  Next, the winding deviation inspection of the finished wound body 7 is performed. In order to confirm the winding state of the winding body inside the battery, a transmission image of the winding body 7 is taken using the X-ray inspection apparatus 8, and the winding state of the positive electrode 1, the negative electrode 2, and the separators S1 and S2 is checked. The quality is judged visually or by image analysis.

  In FIG. 2, an example of a structure of the main part of the X-ray inspection apparatus 8 is shown. An inspector such as a battery in which a wound body 7 indicated by reference numeral 11 is housed is irradiated with X-rays from an X-ray source indicated by reference numeral 12 and absorbs X-rays. An X-ray transmission image is taken by a camera 14 having 13.

  Based on such an X-ray transmission image, the winding deviation is visually determined. There is also a method of automatically detecting winding deviation by sending image data from the camera 14 to an image processing unit (not shown) and performing image processing determination.

  As a result of the determination, if the winding state is unintentional, the target edge position of the EPC unit 5 is manually set sequentially so that a good winding state is obtained, and after the winding body is produced again, the quality is determined. . As a result, it is possible to eliminate the winding deviation of the wound body and to produce a good wound body.

The following Patent Document 1 describes an X-ray inspection apparatus that automatically performs a winding deviation inspection based on an X-ray transmission image and determines the quality of winding deviation of a wound body.
Japanese Patent No. 3290927

  As shown in FIG. 3, in Patent Document 1, in the X-ray inspection apparatus shown in FIG. 2, by arranging a filter 15 between the X-ray source 12 and the inspection object 11, the amount of X-ray irradiation is reduced. By adjusting, an X-ray transmission image without density unevenness can be obtained. By performing image processing determination based on such a high-quality X-ray transmission image, detection of the electrode edge portion is facilitated, and winding deviation determination can be performed with higher accuracy.

  However, the winding deviation detection apparatus using X-rays as described above has the following problems.

  First, the X-ray irradiation apparatus and the X-ray irradiation apparatus camera are expensive. Further, since the X-ray source is a consumable item, it is a factor that increases the running cost.

  Secondly, because X-rays are harmful when leaked, it is necessary to isolate the inspection environment from the worker with a lead cover, etc., and there is a possibility of an accident, so there is a danger as a mechanical facility. Is expensive.

  Thirdly, since the X-ray irradiation device and the camera for the X-ray irradiation device are large, the winding deviation is inspected by the X-ray transmission image processing after the winding is finished, and the quality is determined. take time. Further, since the deviation adjustment of the winding device is manually performed based on the determination result, the overall productivity is reduced.

  Fourth, since the number of winding layers of the wound body increases from the outermost periphery to the central portion, there is a low density difference between the outermost winding layer transmission image and the central winding layer transmission image. It becomes image quality. For this reason, when the number of winding layers increases, it is difficult to measure winding deviation at the center.

  Fifth, since the battery separator uses a polyolefin-based material such as polypropylene or polyethylene, the battery separator easily transmits X-rays, and measurement of the winding deviation between the separator and the electrode based on the X-ray transmission image is possible. It is very difficult. For this reason, the winding deviation inspection between each winding layer and a separator cannot be performed, and there exists a possibility that an inspection accuracy may deteriorate.

  Therefore, in the present invention, there is provided a winding deviation inspection method and a winding apparatus having a winding deviation inspection function that solve the above-mentioned problems, are safe, inexpensive, small in size, low in running cost, and capable of inspecting winding deviation with a separator. The purpose is to provide.

In order to solve the above-mentioned problem, the first invention is a winding deviation of a wound body obtained by laminating a belt-shaped or strip-shaped first sheet material and a second sheet material and winding them on a core. In the winding deviation inspection method for inspecting the image by image processing,
Forming an image to be inspected by taking an image of the core portion and the vicinity of the core portion from the main surface side opposite to the main surface of the core that is a wide surface of the core , and processing the inspected image Detecting the position data of the edge portion of the first sheet material in the core portion and the position data of the edge portion of the second sheet material in the vicinity of the core portion;
Calculating the difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the second sheet material;
The method includes a step of determining a winding deviation based on a difference in position data.
Moreover, 2nd invention laminates | stacks the strip | belt-shaped or strip-shaped 1st sheet material, the 2nd sheet material, the 3rd sheet material, and the 4th sheet material, and winds on a core. In the winding deviation inspection method for inspecting the battery winding deviation by image processing,
Forming an image to be inspected by taking an image of the core portion and the vicinity of the core portion from the main surface side opposite to the main surface of the core that is a wide surface of the core , and processing the inspected image Detecting the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material, respectively,
The method includes a step of determining a winding deviation based on a positional relationship between the first sheet material and the second sheet material and a positional relationship between the third sheet material and the fourth sheet material.

3rd invention laminates | stacks the strip | belt-shaped or strip-shaped 1st sheet material, the 2nd sheet material, the 3rd sheet material, and the 4th sheet material, and is wound on a core. In a winding deviation inspection method for inspecting battery winding deviation by image processing,
Forming an image to be inspected by photographing the core portion and the vicinity of the core portion from the main surface side opposite to the core main surface, which is a wide surface of the core, with an imaging device, and processing the image to be inspected Detecting the position data of the edge part of the first sheet material in the core part and the position data of the edge part of the third sheet material in the vicinity of the core part;
Calculating the difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the third sheet material;
The method includes a step of determining a winding deviation based on a difference in position data.

A fourth invention is a winding device for laminating a strip-like or strip-like sheet material and winding it on a winding core,
Forming an image to be inspected by photographing the core portion and the vicinity of the core portion from the main surface side opposite to the core main surface, which is a wide surface of the core, with an imaging device, and processing the image to be inspected Detecting means for detecting position data of the edge portion of the first sheet material in the core portion and position data of the edge portion of the second sheet material in the vicinity of the core portion;
Calculating means for calculating a difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the second sheet material;
It has a judging means for judging winding deviation based on a difference in position data.
A fifth invention is a winding in which a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material are laminated and wound on a core. In the turning device,
Forming an image to be inspected by photographing the core portion and the vicinity of the core portion from the main surface side opposite to the core main surface, which is a wide surface of the core, with an imaging device, and processing the image to be inspected Detecting means for detecting the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material, respectively,
It has a judging means for judging winding deviation based on the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material.

A sixth invention is a winding in which a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material are laminated and wound on a core. In the turning device,
Forming an image to be inspected by photographing the core portion and the vicinity of the core portion from the main surface side opposite to the core main surface, which is a wide surface of the core, with an imaging device, and processing the image to be inspected Detecting means for detecting the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material, respectively,
It has a determination means for determining winding deviation based on the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material.

  According to this invention, since the device is small and an image sensor using a camera can be arranged inside the winding device, the winding deviation is determined during winding, and the result is fed back to the winding device at an early stage, and automatically Since it is possible to produce a wound body while performing correction, productivity is high.

  Moreover, since X-rays are not used, safety is high. Since only the image processing apparatus is used, the winding deviation detection apparatus itself is as low as about 1/5 of the X-ray apparatus. Moreover, since the consumable parts are only the halogen lamps for illumination, the running cost is about 30 to 40 times that of the conventional one, and the cost can be greatly reduced.

  Furthermore, since the winding deviation can be determined every 360 ° rotation (one turn), even if the number of winding layers increases, the winding deviation can always be detected with high accuracy. In addition, it is possible to inspect the winding deviation between the separator and each electrode.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 4 is a perspective view showing an example of a winding battery to which the winding device and the winding deviation inspection method to which the present invention is applied can be used. As shown in FIG. 4, the wound battery includes a strip-shaped positive electrode 21, a strip-shaped negative electrode 22 disposed to face the positive electrode 21, and a gel electrolyte layer 24 formed on both surfaces of the positive electrode 21 and the negative electrode 22. The battery element 20 includes the light-transmitting separators 23 a and 23 b laminated together with the positive electrode 21 and the negative electrode 22 on which the gel electrolyte layer 24 is formed. Specifically, the battery element 20 includes a positive electrode 21 on which a gel electrolyte layer 24 is formed, a separator 23a, a negative electrode 22 on which a gel electrolyte layer 24 is formed, and a separator 23b, which are sequentially stacked in the longitudinal direction. It is wound many times.

  As shown in FIG. 5, the battery element 20 manufactured as described above is housed in an exterior material 31 made of a moisture-proof laminate film and sealed by welding the periphery of the battery element 20. The battery element 20 is provided with leads 25, and these leads 25 are sandwiched between exterior materials 31 and are drawn out to the outside.

  The packaging material 31 has, for example, a stacked structure in which an adhesive layer, a metal layer, and a surface protective layer are sequentially stacked. The adhesive layer is made of a polymer film, and examples of the material constituting the polymer film include polypropylene (PP), polyethylene (PE), and unstretched polypropylene (CPP). The metal layer is made of a metal foil, and an example of a material constituting the metal foil is aluminum (Al). Examples of the material constituting the surface protective layer include nylon (Ny) and polyethylene terephthalate (PET). The surface on the adhesive layer side is a storage surface on the side where the wound electrode element 1 is stored.

  FIG. 6 is a schematic diagram showing an example of the configuration of a winding device to which the present invention is applied.

  The winding device 40 mainly includes an EPC unit 45a, 45b, 45c, 45d (hereinafter, referred to as an EPC unit 45 as appropriate when it does not represent a specific EPC unit) and a winding deviation image processing unit 49. . The EPC unit 45 includes detection units 43a, 43b, 43c, and 43d (hereinafter referred to as the detection unit 43 as appropriate when not representing a specific detection unit), tilt rollers 44a, 44b, 44c and 44d (hereinafter referred to as a tilting roller 44 when not showing a specific tilting roller).

  The winding deviation image processing unit 49 includes a winding core 46, a camera 47, and an image processing device 48. The state of the positive electrode 41, the separator S41, the negative electrode 42, and the separator S42 wound on the core 46 is photographed by the camera 47 every rotation and sent to the image processing device 48. The image processing device 48 detects the edge positions of the positive electrode and the negative electrode based on the captured image. The detected position data is temporarily accumulated for each rotation, and the average value of the position data is calculated at the stage when the winding for one cell is completed, and is used as edge position data for one cell.

  Further, the average value is obtained by removing the maximum value and the minimum value from the edge position data of one cell accumulated so far, and the target edge position is automatically corrected based on the average edge position data.

  In the EPC unit 45, the edge position is detected by the detector 43, and the detected edge position is controlled by the tilt roller 44 so as to coincide with the target edge position. When there is a winding deviation, the target edge position of the EPC unit 45 is automatically corrected and controlled so as to coincide with the new target edge position. The target position of the edge is set in advance, and basically is not changed manually.

  As described above, the winding deviation determination is performed for each turn by the winding deviation image processing unit 49 in the winding apparatus. Therefore, an X-ray transmission image or the like is applied to the wound body completed as in the prior art. The inspection used may not be performed.

  FIG. 7 shows a state in which the positive electrode 41, the separator S41, the negative electrode 42, and the separator S42 wound on the winding core 46 are wound. FIG. 7A is a perspective view showing a winding state, and FIG. 7B is a top view.

  7A and 7B, the portion indicated by reference numeral 42a is a portion where the negative electrode 42 can be seen through the separator S42. In general, the thickness of the separator is preferably 10 to 50 μm and is very thin, so that a negative electrode made of a metal foil coated with a negative electrode mixture containing carbon or the like as an active material can be seen through. In polymer lithium batteries and the like, since an electrolyte is applied to an electrode and then laminated and wound, the negative electrode is more transparent and visible.

  In FIG. 7A and FIG. 7B, a portion indicated by reference numeral 50 is an area photographed by the camera 47. The camera 47 images the winding state from the direction of reference numeral 51 and sends image data to the image processing device 48.

  FIG. 8 shows a captured image of the area 50 photographed by the camera 47. This image is sent to the image processing device 48, and the edge position of each electrode is detected. What is indicated by reference numeral 61 is the detected positive electrode edge position of the positive electrode 41, and what is indicated by reference numeral 62 is the detected negative electrode edge position. A distance between the positive electrode edge position 61 with reference to the negative electrode edge position 62 is defined as a positive / negative electrode clearance 60. The image processing device 48 detects whether the positive and negative electrode clearances 60 are within the reference value every time the core 46 is rotated once (360 ° rotation), and if it does not fall within the reference value, the EPC unit 45 of the winding device. To correct the edge position.

[Calculation method for positive and negative electrode clearance]
By obtaining the positive and negative electrode clearance 60, it is possible to detect winding deviation between the positive electrode and the negative electrode and winding deviation between the winding layers. Note that the image processing device 48 stores not the image itself taken by the camera 47 but the position data obtained by the coordinates on the image obtained by the image processing, and the positive and negative clearance 60 is determined using this position data. Ask.

  For the detection of the electrode edge position, in the case of FIG. 8, the difference is detected by the distance from the normal screen left end. However, by using a camera to detect the edge position of each electrode, the camera can be affected by vibrations of the winding device itself or artificial vibrations (vibrations when walking near the device, vibrations when touching the device, etc.). Shake may occur. In such a case, a measurement error may occur when the edge position is detected, which may cause an erroneous determination.

  Therefore, as shown in FIG. 9, winding is performed using a core 46 a in which a notch 63 is provided at the leading end of the core 46, and the positive edge position 61 and the negative electrode are taken with reference to the edge position of the notch 63. The edge position 62 is measured. By this method, even if the camera 47 is shaken, the positional relationship between the notch 63, the positive edge position 61, and the negative edge position 62 does not change, so that the generation of measurement errors can be suppressed, and accurate edge position measurement, The negative electrode clearance 60 can be calculated. In this case, the edge position can be detected with high accuracy by applying light from the lower side of the core 46 so that the core is black and the background is white, so that the notch 63 is clearly visible. To be able to do.

[Judgment method of winding deviation]
Hereinafter, a method for determining the winding deviation by measuring the edge position of each electrode will be described.

  FIG. 10A shows a state in which the positive electrode 41, the separator S41, the negative electrode 42, and the separator S42 are stacked and wound, and FIG. 10B shows a state one turn (360 °) before the state of FIG. 10A. Reference numeral 61a indicates a positive edge position in the previous turn, and reference numeral 62a indicates a negative edge position in the previous turn.

  In the determination of winding misalignment between the positive electrode and the negative electrode according to the present invention, the edge position of the positive electrode and the negative electrode is measured, and whether or not there is any winding misalignment is detected by detecting whether the positive and negative electrode clearance 60 that is the difference is within the specified range. Judgment. The detection of the edge position at each turn will be described below. For example, when FIG. 10A is the second turn, FIG. 10B represents the first turn, and when FIG. 10A is the third turn, FIG. 10B represents the state of the second turn.

  First, the winding of the first turn will be described. The positive electrode edge position 61 and the negative electrode edge position 62 of the first turn are measured, and the positive and negative electrode clearance 60 is detected from the position data. Position data of each of the positive edge position 61 and the negative edge position 62 can be measured by taking a wound image once. The detected edge position data is stored in the image processing unit 48.

  Next, a winding image is taken at the time of winding of the second turn, the positive electrode edge position 61 and the negative electrode edge position 62 of the second turn are measured, and the positive and negative electrode clearance 60 is detected. Further, from the second turn, the positive / negative clearance 60a is detected by taking the difference between the negative electrode edge position 62 of the second turn and the positive electrode edge position 61a of the previous turn (first turn).

  After the third turn, the same clearance detection as the second turn is performed until the required number of turns.

  Winding deviation between the separator and the electrode can be detected when measuring the positive electrode edge position 61 and the negative electrode edge position 62. For example, when a detection image as shown in FIG. 8 is used, the separator S41 is arranged on the left side and the positive electrode 41 is arranged on the right side with the positive electrode edge position 61 as a boundary. On the photographed image, the separator S41 looks bright, while the positive electrode 41 looks dark. Therefore, the light-dark boundary point is set as the positive edge position 61. However, when the positive electrode 41 protrudes from the separator S41, the positive electrode 41 is on the left side and the separator S41 is on the right side, and the arrangement of light and darkness is reversed, so that dark → light is detected or there is no boundary point. Determined. In such a case, it is determined that there is a winding deviation because the positive electrode 41 protrudes from the separator S41. Winding deviation can be detected by the same method for the negative electrode 42 and the separator S42.

  Further, when detecting the edge position from the photographed image, a detection window for detecting each edge position is provided, and a boundary point between light and dark is detected in each detection window. By limiting and setting the size of the detection window, if the edge position deviates greatly, the edge protrudes from the detection window, the boundary point is not detected, and it is determined that there is a winding deviation.

  FIG. 11 shows a cross-sectional view of a wound body 70 manufactured using the above-described method. As described above, with the current negative electrode edge position 62 as a reference, the clearance with the positive electrode on both sides thereof (the positive and negative electrode clearance 60 with the current positive electrode edge position 61 and the positive and negative electrode clearance with the positive electrode edge position 61a in the previous turn) By detecting 60a), it is possible to detect the misalignment of the stacked positive electrode 41 and negative electrode 42 and the winding misalignment occurring between the turns.

  When checking visually using an X-ray transmission image as in the past, or when using an inspection method that determines only whether the electrode has not popped out of the separator even in automatic determination, it is confirmed that the electrode has popped out at one end. Even if it is not done, there are cases where it protrudes at multiple ends, so it is necessary to check the protrusion of the electrode at both ends of the wound body. In particular, when automatic determination is performed, image data must be analyzed and processed at both ends, and the inspection process becomes complicated. However, when the winding deviation is determined using this method, it is only necessary to check one end of the wound body in order to determine whether the positive and negative electrode clearances are within a predetermined range. As a result, there is no need to consider popping out at the other end, leading to simplification of the process.

[Automatic correction of winding deviation]
When an image obtained by photographing the core 46 by the camera 47 is processed by the image processing device 48, when it is determined that there is a winding deviation, it is fed back to the EPC unit 45, and automatic correction is performed for each wound body cell. .

  FIG. 12 shows an example of the edge position correction operation. FIG. 12 shows a process in which the edge positions of the sheet 80 such as electrodes and separators are automatically corrected to the target position indicated by reference numeral 83.

  In FIG. 12A, the sheet 80 is wound in a state where the edge position 84 of the sheet 80 is aligned at a preset reference position 82. At this time, the edge position of the sheet is detected by a laser sensor 81 emitted from a detection unit installed in the EPC unit 45.

  The edge position 84 is detected from the image photographed on the core 46, and the edge position 84 detected by the image processing device 48 is compared with the target position 83 on the image to obtain the target position 83. The amount of deviation 85 is measured. After winding a plurality of cells, the average edge position of the wound N cells and the target position 83 are compared to measure the amount of deviation.

  Next, the position of the sheet 80 is corrected based on the measured misalignment amount 85. A correction value obtained by multiplying the deviation amount 85 detected in FIG. 12A by a predetermined correction rate is calculated, and feedback is performed to the EPC unit 45 so as to change the reference position by the correction value. For example, in the case of FIG. 12B, since the sheet 80 is displaced to the top side, the calculated correction value is subtracted from the EPC reference value so that the reference position is changed to the bottom side (FIG. 12C).

  When the EPC unit feeds back the reference position 82 to the new reference position 82a, the tilt roller 44 tilts in accordance with the correction direction, corrects the position of the sheet 80, and the edge position 84 becomes the new reference position 82a. Control to overlap.

  Then, after correcting the position of the sheet 80 so that the edge position 84 overlaps the new reference position 82a, the tilt roller 44 returns to the original state so that the edge position 84 is maintained at the new reference position 82a. Further, after this, the edge position 84 is measured and corrected for each cell, and control is performed so that the winding is performed at a predetermined position.

  When measuring the amount of deviation, if the positive electrode 41 and / or the negative electrode 42 are greatly deviated from the target position, the edge position is greatly deviated from the edge position detection window, or the positional relationship with the separator is reversed. Cannot be detected. In such a case, it is determined as a defective product. Further, even if the electrode is accommodated in the separator, if the positive and negative electrode clearances are not within the predetermined range, it is determined as a defective product. When the electrode is accommodated in the separator and the positive and negative electrode clearance is within the range, it is determined as a non-defective product.

  In this way, the position of the positive electrode and the negative electrode can be image-processed and measured every turn, and the electrode position can be automatically corrected for each cell. This greatly improves the correction accuracy, improves productivity, and simplifies the process. Is possible.

  Furthermore, when there is a winding deviation and it is determined that the product is defective, the product is discharged separately from the non-defective product. For this reason, confusion between non-defective products and defective products does not occur, and productivity can be further improved.

  The embodiment of the present invention has been specifically described above, but the present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible.

  For example, the configuration of the apparatus described in the above-described embodiment is merely an example, and a configuration different from this may be used as necessary.

  In addition, this device can be used as long as the battery has a configuration in which the positive electrode and the negative electrode are wound, and the electrolytic solution may be gel or liquid. It can also be used for cylindrical batteries, square batteries, sheet batteries, and the like.

It is an approximate line figure showing an example of the conventional winding device and a winding gap inspection process. It is a schematic diagram which shows an example of a structure of the main part of the winding | deviation inspection apparatus using an X-ray. It is a schematic diagram showing a configuration of a winding deviation inspection apparatus configured to improve inspection performance in a conventional winding deviation inspection apparatus using X-rays. It is a perspective view which shows an example of the battery element which can use the winding apparatus to which this invention is applied, and a winding deviation test | inspection method. It is a schematic diagram which shows a mode that the battery device which can use the winding apparatus and winding | deviation inspection method to which this invention is applied is armored with a laminate film. It is a schematic diagram which shows an example of a structure of the winding apparatus to which this invention is applied. It is a schematic diagram which shows a mode when laminating | stacking in order of a positive electrode, a separator, a negative electrode, and a separator, and winding. It is a schematic diagram which shows the mode of the capture image of the area | region imaged with the camera installed in the winding apparatus. FIG. 6 is a schematic diagram illustrating a captured image in a case where a winding core provided with a notch at the tip is used to prevent measurement errors due to camera shake. It is a schematic diagram which shows the edge position of each electrode when winding the electrode laminated body which laminates | stacks a positive electrode, a separator, a negative electrode, and a separator in this order, and the edge position of each electrode before 1 turn. It is sectional drawing which shows the positive / negative electrode clearance in the winding body to which this invention is applied. It is a schematic diagram which shows an example of the correction | amendment operation | movement of the edge position of an electrode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,41 ... Positive electrode 2,42 ... Negative electrode 3,43 ... Detection part 4,44 ... Inclination roller 5,45 ... EPC part 6,46 ... Core 7 ... Winding body 8 ... X-ray inspection device S1, S2, S41, S42 ... Separator R1, R2, R3, R4 ... Original fabric 11 ... Winding body 12 ... X-ray source 13. ..Image intitiator 14 ... Camera 21 ... Positive electrode 22 ... Negative electrode 23 ... Separator 24 ... Gel electrolyte layer 31 ... Exterior material 47 ... Camera 48 ... Image processing Apparatus 49 ... Image processing unit 60 ... Positive / negative clearance 60a ... Positive / negative clearance 61 ... Positive edge position 61a ... Previous turn positive edge position 62 ... Negative edge position 62a ... Previous Turn negative edge position 81 ... Laser sensor S 82 ... Reference position 82a ... New reference position 83 ... Target position 84 ... N cell average position 85 ... Deviation amount

Claims (13)

In the winding deviation inspection method for inspecting the winding deviation of the wound body formed by laminating the first sheet material in the form of a strip or strip and the second sheet material and winding on the winding core by image processing,
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. Detecting the position data of the edge part of the first sheet material in the core part and the position data of the edge part of the second sheet material in the vicinity of the core part by processing
Calculating the difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the second sheet material;
A winding deviation inspection method comprising a step of determining winding deviation based on the difference in the position data. Image of winding deviation of a battery formed by laminating a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material and winding them on a winding core In the winding deviation inspection method to inspect by processing,
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. Detecting the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material, respectively, by processing
Winding displacement inspection having a step of determining winding displacement based on the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material. Method. Image of winding deviation of a battery formed by laminating a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material and winding them on a winding core In the winding deviation inspection method to inspect by processing,
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. Detecting the position data of the edge part of the first sheet material in the core part and the position data of the edge part of the third sheet material in the vicinity of the core part by processing
Calculating the difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the third sheet material;
A winding deviation inspection method comprising a step of determining winding deviation based on the difference in the position data. The first sheet material is a positive electrode, the second sheet material is a separator, the third sheet material is a negative electrode, and the fourth sheet material is a separator. The winding deviation inspection method described in 1. 4. The winding deviation inspection method according to claim 2, further comprising a step of determining winding deviation between winding layers and winding deviation between each winding layer and a separator based on the difference between the position data and the positional relationship. The winding deviation inspection method according to claim 3, wherein the position data is detected based on a fixed mark provided on the winding core. In a winding device for laminating a strip or strip-shaped sheet material and winding it on a winding core,
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. Detecting means for detecting the position data of the edge portion of the first sheet material in the core portion and the position data of the edge portion of the second sheet material in the vicinity of the core portion by processing
Calculating means for calculating a difference between the position data of the edge portion of the first sheet material and the position data of the edge portion of the second sheet material;
A winding device having determination means for determining a winding deviation based on the difference in the position data. In a winding device for laminating a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material and winding them on a winding core,
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. Detecting means for detecting the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material, respectively, by processing
Winding having determination means for determining winding deviation based on the positional relationship between the first sheet material and the second sheet material and the positional relationship between the third sheet material and the fourth sheet material. apparatus. In a winding device for laminating a belt-shaped or strip-shaped first sheet material, a second sheet material, a third sheet material, and a fourth sheet material and winding them on a winding core,
An image to be inspected is formed by photographing the vicinity of the core portion with a photographing apparatus, and the position data of the edge portion of the first sheet material and the edge portion of the third sheet material are processed by processing the image. Detection means for detecting position data;
An image to be inspected is formed by photographing the core portion and the vicinity of the core portion with a photographing device from a main surface side opposite to the main surface of the core that is a wide surface of the core. And calculating means for calculating a difference between the position data of the edge portion of the first sheet material in the core portion and the position data of the edge portion of the third sheet material in the vicinity of the core portion. ,
A winding device having determination means for determining a winding deviation based on the difference in the position data. The first sheet material is a positive electrode, the second sheet material is a separator, the third sheet material is a negative electrode, and the fourth sheet material is a separator. The winding apparatus as described in. 10. The winding device according to claim 8, further comprising a determination unit configured to determine a winding shift between winding layers and a winding shift between each winding layer and the separator based on the difference in the position data and the positional relationship. The winding apparatus according to claim 9, further comprising a correction unit that corrects an edge position of the sheet material based on the difference in the position data. The winding device according to claim 11, further comprising a unit for separating and discharging a non-defective product and a defective product based on the determination of the winding deviation.

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