JP2016070685A - Surface inspection device and electrode manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface inspection device with which it is possible to improve the accuracy of detecting foreign matter, and an electrode manufacturing device.SOLUTION: A surface inspection device 2 comprises: a first conveyance unit 4 for conveying a strip electrode M in which an active material mixture layer MA is coated on one surface M1 of a metal foil ME; a second conveyance unit 5 for moving pressure sensitive paper P in the conveyance direction A of the strip electrode M; and a pair of second rolls 6 provided with a predetermined interval so as to hold the pressure sensitive paper P and the strip electrode M therebetween. An electrode manufacturing device 1 comprises the surface inspection device 2 and a pair of first rolls 3 for compressing the strip electrode M and provided so as to hold the strip electrode M therebetween, the pair of second rolls 6 being disposed on the upstream side from the pair of first rolls 3 in the conveyance direction A of the strip electrode M.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a surface inspection apparatus and an electrode manufacturing apparatus.

  There is a device that detects foreign matter using image data of an electrode surface. For example, Patent Document 1 irradiates light on an electrode material conveyed by a roller, acquires image data of the scattered light, and removes foreign matter adhering to the surface of the electrode material from the acquired image data. An apparatus for detecting is disclosed.

Japanese Unexamined Patent Publication No. 2010-25566

  In an apparatus that detects foreign matter using image data, the foreign matter detection accuracy may be reduced depending on the type of active material layer and the type of foreign matter. For example, when the color of the foreign material is similar to the color of the active material layer coated on the metal foil, it is difficult to distinguish the active material layer from the foreign material in the image data, so the detection accuracy of the foreign material may be reduced. There is. In this technical field, a surface inspection apparatus and an electrode manufacturing apparatus that can improve the detection accuracy of a foreign object regardless of the type of the foreign object are desired.

  A surface inspection apparatus according to an aspect of the present invention includes a first transport unit that transports a strip electrode in which an active material mixture is coated on at least one surface of a metal foil, and transports pressure-sensitive paper in the transport direction of the strip electrode. And a pair of rolls provided with a predetermined interval so as to sandwich the pressure sensitive paper and the strip electrode.

  In this surface inspection apparatus, the strip-shaped electrode transported by the first transport unit and the pressure-sensitive paper transported by the second transport unit are sandwiched by a pair of rolls at a predetermined interval. When foreign matter adheres to the strip electrode, the thickness of the region where the foreign matter adheres in the strip electrode is larger by the thickness of the foreign matter than the thickness of the region where the foreign matter does not adhere in the strip electrode. For this reason, when sandwiched between a pair of rolls, the pressure applied to the area of the pressure sensitive paper facing the area where the foreign matter adheres in the belt-like electrode is Compared to the pressure applied to the region. Since the color density changes depending on the pressure applied to the pressure-sensitive paper on the surface of the pressure-sensitive paper, the pressure-sensitive paper on the surface of the pressure-sensitive paper after passing through a pair of rolls is opposed to the region where the foreign matter is adhered to the strip electrode In this area, the change in color density is larger than that in the area of the pressure-sensitive paper facing the area where no foreign matter is adhered to the belt-like electrode. In this way, the color density on the surface of the pressure-sensitive paper sandwiched between the pair of rolls changes, so that the color density on the surface of the pressure-sensitive paper after passing through the pair of rolls adheres to the belt-like electrode. Foreign matter can be detected. As a result, even if the color of the foreign matter is similar to the color of the strip electrode, such as an aggregate of the active material mixture, it adheres to the strip electrode by checking the color density on the surface of the pressure sensitive paper. Foreign matter can be detected. Therefore, the foreign matter detection accuracy can be improved.

  The surface inspection apparatus according to another aspect of the present invention may further include an imaging unit that is provided on the downstream side of the pair of rolls in the conveyance direction of the pressure-sensitive paper, and images the surface of the pressure-sensitive paper. A foreign substance attached to the strip electrode may be detected based on the color of the surface of the imaged pressure sensitive paper.

  If comprised in this way, the surface of the pressure sensitive paper after passing a pair of roll will be imaged by the imaging part. For example, by detecting whether or not a region having a high color density exists locally on the surface of the imaged pressure sensitive paper, foreign matter attached to the band-shaped electrode can be detected.

  An electrode manufacturing apparatus according to still another aspect of the present invention includes a first transport unit that transports a strip electrode in which an active material mixture is coated on at least one surface of a metal foil, and transports the pressure sensitive paper to the strip electrode. A second conveying section that conveys in the direction, a pair of first rolls that compress the band-shaped electrode, and a pair of first rolls that compress the band-shaped electrode, and a predetermined interval so as to sandwich the pressure-sensitive paper and the band-shaped electrode. A pair of second rolls, and the pair of second rolls are disposed upstream of the pair of first rolls in the transport direction of the strip-shaped electrode.

  In this electrode manufacturing apparatus, the strip-shaped electrode transported by the first transport unit and the pressure-sensitive paper transported by the second transport unit are sandwiched by a pair of second rolls at a predetermined interval. When foreign matter adheres to the strip electrode, the thickness of the region where the foreign matter adheres in the strip electrode is larger by the thickness of the foreign matter than the thickness of the region where the foreign matter does not adhere in the strip electrode. For this reason, when sandwiched between the pair of second rolls, the pressure applied to the area of the pressure-sensitive paper facing the area where the foreign substance adheres in the belt-like electrode is sensitive to the area where the foreign substance does not adhere in the belt-like electrode. It becomes larger than the pressure applied to the area of the pressure paper. On the surface of the pressure-sensitive paper, the color density changes depending on the pressure applied to the pressure-sensitive paper. Therefore, the surface of the pressure-sensitive paper after passing through the pair of second rolls is opposed to the region where the foreign matter adheres on the belt-like electrode. The pressure-sensitive paper region has a greater change in color density than the pressure-sensitive paper region facing the region where no foreign matter is adhered to the belt-like electrode. Thus, since the color density on the surface of the pressure sensitive paper sandwiched between the pair of second rolls changes, by checking the color density on the surface of the pressure sensitive paper after passing through the pair of second rolls, Foreign matter adhering to the strip electrode can be detected. As a result, even if the color of the foreign matter is similar to the color of the strip electrode, such as an aggregate of the active material mixture, it adheres to the strip electrode by checking the color density on the surface of the pressure sensitive paper. Foreign matter can be detected. Therefore, the foreign matter detection accuracy can be improved. Furthermore, when the pair of first rolls compresses the strip-shaped electrode to which foreign matter has adhered, an impression may be formed on the rotating surface. For this reason, when the foreign matter adhering to the strip electrode is detected, it is possible to avoid compressing the strip electrode to which the foreign matter adheres, for example, by stopping the conveyance of the metal foil. It is possible to suppress the formation of indentations.

  An electrode manufacturing apparatus according to still another aspect of the present invention is provided on the downstream side of the pair of second rolls in the conveyance direction of the pressure-sensitive paper, and is imaged by the imaging unit that images the surface of the pressure-sensitive paper, and the imaging unit. And a controller that controls the distance between the pair of first rolls based on the color of the surface of the pressure sensitive paper.

  If comprised in this way, the surface of the pressure sensitive paper after passing a pair of 2nd roll will be imaged by an imaging part. When a region having a high color density is detected locally on the surface of the imaged pressure-sensitive paper, it can be seen that a larger pressure is applied to this region than the other regions. At this time, it is thought that the pressure applied to the said area | region became large because the foreign material had adhered to the strip | belt-shaped electrode which passed a pair of 2nd roll. For this reason, for example, in response to detecting a region where the color density of the surface of the imaged pressure-sensitive paper is larger than the other regions, the pair of first rolls are controlled so that they are separated from each other. It is possible to avoid compressing the belt-like electrode to which is adhered, and it is possible to suppress the formation of indentations on the rotating surfaces of the pair of first rolls due to the foreign matter attached to the belt-like electrode.

  In the electrode manufacturing apparatus according to still another aspect of the present invention, the control unit may include a pressure calculation unit that calculates a pressure applied to the pressure-sensitive paper, and the pressure calculated by the pressure calculation unit is equal to or greater than a predetermined threshold value. In this case, the distance may be controlled so that the force with which the pair of first rolls compress the strip electrode is reduced.

  When the pressure applied to the pressure-sensitive paper that has passed through the pair of second rolls is equal to or greater than the threshold value, it is considered that foreign matter is attached to the belt-like electrode. For this reason, when it is detected that the pressure applied to the pressure-sensitive paper is equal to or greater than the threshold value, the distance between the pair of first rolls is controlled so that the force with which the pair of first rolls compress the strip electrode is reduced. By doing so, it is possible to avoid compressing the belt-like electrode to which foreign matter is attached, and it is possible to suppress the formation of indentations on the rotating surfaces of the pair of first rolls.

  According to various aspects of the present invention, the foreign matter detection accuracy can be improved.

It is a schematic block diagram which shows typically the manufacturing apparatus of an electrode provided with the surface inspection apparatus which concerns on one Embodiment. It is a figure for demonstrating the color change in the surface of a pressure sensitive paper.

  Embodiments of a surface inspection apparatus and an electrode manufacturing apparatus according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic configuration diagram schematically illustrating an electrode manufacturing apparatus including a surface inspection apparatus according to an embodiment. As shown in FIG. 1, the electrode manufacturing apparatus 1 is a process for manufacturing an electrode used in, for example, a power storage device. It is used in a pressing process for increasing the active material density of the active material mixture layer that is a precursor of the active material layer. Examples of the power storage device include a secondary battery or an electric double layer capacitor. Examples of the secondary battery include a lithium ion secondary battery.

  The strip electrode M includes a metal foil ME and an active material mixture layer MA applied to both surfaces M1 and M2 of the metal foil ME. The metal foil ME is, for example, an aluminum foil in the case of a positive electrode and a copper foil in the case of a negative electrode. The active material mixture layer MA includes an active material, a binder, and a conductive additive. The active material contained in the active material mixture layer MA is a positive electrode active material or a negative electrode active material. Examples of the positive electrode active material include composite oxides, metallic lithium, and sulfur. The composite oxide includes, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium. Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ≦ x ≦ 1. 5) and the like, and boron-added carbon. The binder may be a thermoplastic resin such as PVDF or polyamideimide, or may be a polymer resin having an imide bond in the main chain. The strip electrode M is transported along a transport direction A such as a horizontal direction.

  The electrode manufacturing apparatus 1 includes a surface inspection apparatus 2 and a pair of first rolls 3. The pair of first rolls 3 are provided so as to sandwich the belt-like electrode M, and compress the active material mixture layer MA. Each of the pair of first rolls 3 has a cylindrical shape. Each of the pair of first rolls 3 has a rotation axis extending in the width direction of the belt-like electrode M, and is rotatable around the rotation axis. One of the first rolls 3 is provided such that its rotation surface comes into contact with one surface M1 of the strip electrode M, and rotates in the rotation direction C1. The other first roll 3 is provided such that its rotation surface is in contact with the other surface M2 of the strip electrode M, and rotates in a rotation direction C2 opposite to the rotation direction C1. The pair of first rolls 3 oppose each other with the strip electrode M interposed therebetween.

  The surface inspection apparatus 2 is an apparatus that inspects the surface of the strip electrode M. The surface inspection apparatus 2 includes a first transport unit 4, a second transport unit 5, a pair of second rolls 6, and an imaging unit 8.

  The first transport unit 4 transports the strip electrode M in the transport direction A. The first transport unit 4 includes an electrode feed roll 41, a plurality of electrode transport rolls 42, and an electrode winding roll 43.

  The electrode feed roll 41 feeds the strip electrode M wound in a roll shape. The plurality of electrode transport rolls 42 guide the strip electrode M fed from the electrode feed roll 41 in the transport direction A. Each of the electrode transport rolls 42 is provided such that its rotating surface comes into contact with the other surface M2 of the strip electrode M. The plurality of electrode transport rolls 42 are provided upstream or downstream of the pair of first rolls 3 in the transport direction A. The electrode winding roll 43 winds the strip electrode M guided by the electrode transport roll 42. The conveyance speed of the strip electrode M by the first conveyance unit 4 is, for example, 10 m / min.

  The second transport unit 5 transports the pressure sensitive paper P in the transport direction B. The pressure sensitive paper P is a self-coloring type pressure sensitive paper. The self-coloring type pressure-sensitive paper is composed of an upper leaf paper coated with a microcapsule encapsulating a dye such as a color former and a lower leaf paper coated with a developer such as a resin. As a result, the microcapsules are destroyed, and the dye and the developer are brought into contact with each other to develop a color. As the pressure applied to the pressure sensitive paper P increases, the color density of the pressure sensitive paper P increases. The second transport unit 5 includes a pressure-sensitive paper feed roll 51, a plurality of pressure-sensitive paper transport rolls 52, and a pressure-sensitive paper take-up roll 53.

  The pressure-sensitive paper feeding roll 51 feeds the belt-shaped pressure-sensitive paper P wound in a roll shape. The plurality of pressure-sensitive paper transport rolls 52 guides the pressure-sensitive paper P fed from the pressure-sensitive paper feed roll 51 in the transport direction B. Each of the plurality of pressure-sensitive paper transport rolls 52 is provided such that its rotating surface comes into contact with the pressure-sensitive paper P. The plurality of pressure-sensitive paper transport rolls 52 are provided upstream or downstream of a pair of second rolls 6 to be described later in the transport direction B. The pressure sensitive paper take-up roll 53 takes up the pressure sensitive paper P guided by the pressure sensitive paper transport roll 52. The conveyance speed of the pressure-sensitive paper P by the second conveyance unit 5 is approximately the same as the conveyance speed of the strip electrode M, and is, for example, 10 m / min.

  The pair of second rolls 6 are provided so as to sandwich the pressure sensitive paper P and the strip electrode M, and press the pressure sensitive paper P against the other surface M2 of the strip electrode M. The pair of second rolls 6 are disposed upstream of the pair of first rolls 3 in the transport direction A. Each of the pair of second rolls 6 has a cylindrical shape. Each of the pair of second rolls 6 has a rotation axis extending in the width direction of the strip electrode M, and is rotatable around the rotation axis. One of the second rolls 6 is provided such that its rotating surface comes into contact with one surface M1 of the strip electrode M, and rotates in the rotation direction C3. The other second roll 6 is provided such that its rotational surface comes into contact with the other surface M2 of the strip electrode M via the pressure sensitive paper P, and rotates in a rotational direction C4 opposite to the rotational direction C3.

    The pair of second rolls 6 are opposed to each other via the strip-shaped electrode M and the pressure sensitive paper P, and are provided so that the respective rotation surfaces of the pair of second rolls 6 have a predetermined interval. The predetermined interval is set slightly smaller than the sum of the thickness of the strip electrode M and the thickness of the pressure sensitive paper P. At this time, one of the pair of second rolls 6 is in contact with the strip electrode M, the other of the pair of second rolls 6 is in contact with the pressure sensitive paper P, and the pair of second rolls 6 is of the pressure sensitive paper P. A pressure that does not change the color of the surface or a pressure that slightly changes the color of the surface of the pressure-sensitive paper P is applied to the pressure-sensitive paper P.

  The imaging unit 8 is provided on the downstream side of the pair of second rolls 6 in the conveyance direction B of the pressure sensitive paper P conveyed by the second conveyance unit 5. The imaging unit 8 images the surface of the pressure sensitive paper P and acquires an image of the surface of the pressure sensitive paper P. The imaging unit 8 is an imaging device such as a camera. The imaging unit 8 outputs the acquired image to the control unit 10. The image on the surface of the pressure-sensitive paper P is an image that can detect foreign matter attached to the strip electrode M based on the color of the surface of the pressure-sensitive paper P.

  Here, with reference to FIG. 2, the image of the surface of the pressure-sensitive paper P imaged by the imaging unit 8 will be described. FIG. 2 is a diagram for explaining a color change on the surface of the pressure-sensitive paper P. FIG. FIG. 2 shows an image of the surface of the pressure sensitive paper P imaged by the imaging unit 8.

  The pressure sensitive paper P includes an area E0 before passing through the pair of second rolls 6 and an area E1 after passing through the pair of second rolls 6. The pressure sensitive paper P is sandwiched between the pair of second rolls 6 together with the strip electrode M at the position P0. That is, the position P0 is a boundary between the region E0 and the region E1.

  Here, as described above, the distance between the pair of second rolls 6 is fixed at a predetermined size. For this reason, when the thickness of the strip electrode M is constant, the pressure sensitive paper P is sandwiched with the strip electrode M by the pair of second rolls 6 when the pressure sensitive paper P passes through the pair of second rolls 6. Thus, a certain pressure is applied to the pressure sensitive paper P. However, this pressure is set to a small value as described above, and as a result, the color of the surface of the pressure-sensitive paper P does not change or changes to a very thin constant density in the region E1.

  On the other hand, foreign matter T (see FIG. 1) such as an aggregate of active material mixture or metallic foreign matter may adhere to one surface M1 or the other surface M2 of the strip electrode M. For example, when the foreign matter T adheres to one surface M1, the thickness of the strip electrode M in the region where the foreign matter T adheres is larger than the thickness of the strip electrode M in the other region. In this case, when the pressure sensitive paper P passes through the pair of second rolls 6, the pressure sensitive paper P is sandwiched together with the belt-like electrode M to which the foreign matters T are adhered by the pair of second rolls 6, so that the foreign matter T adheres. A pressure larger than that of the other areas of the pressure sensitive paper P is applied to the area E3 of the pressure sensitive paper P overlapped with the existing area. As a result, the color of the surface of the pressure sensitive paper P has a higher density in the region E3 than in the other region E1. Therefore, when the foreign matter T adheres to the belt-like electrode M, in the pressure-sensitive paper P pressed by the pair of second rolls 6, an area E <b> 3 in which the color of the surface of the pressure-sensitive paper P becomes dark is generated.

  Returning to FIG. 1, the description of the electrode manufacturing apparatus 1 will be continued. The electrode manufacturing apparatus 1 further includes a control unit 10. The control unit 10 controls the distance between the pair of first rolls 3 based on the color of the surface of the pressure sensitive paper P imaged by the imaging unit 8. The control unit 10 is, for example, a computer. Here, the control performed by the control unit 10 will be specifically described. The control unit 10 includes a pressure calculation unit 12 that calculates the pressure applied to the pressure sensitive paper P, and a roll control unit 14 that controls the distance between the pair of first rolls 3.

  The pressure calculation unit 12 detects the color density of the surface of the pressure-sensitive paper P from the image acquired by the imaging unit 8 and adds to the pressure-sensitive paper P based on the detected color density of the surface of the pressure-sensitive paper P. Calculate the pressure. Here, the color density of the surface of the pressure-sensitive paper P is, for example, the gradation value of each pixel on the surface of the pressure-sensitive paper P acquired by the imaging unit 8. The pressure calculation unit 12 detects the color density of the surface of the pressure sensitive paper P from the image acquired by the imaging unit 8 by performing image processing, for example. The pressure calculation unit 12 calculates the pressure applied to the pressure sensitive paper P using the detected color density of the surface of the pressure sensitive paper P. When the calculated pressure is equal to or greater than a predetermined threshold, the pair of first rolls 3 is output to the roll control unit 14. The predetermined threshold is, for example, 30 MPa.

  The roll control unit 14 controls the distance between the pair of first rolls so that the force with which the pair of first rolls 3 compress the strip electrode M is reduced. Specifically, the roll control unit 14 receives a signal for controlling the pair of first rolls 3 output from the pressure calculation unit 12, so that the respective rotation axes of the pair of first rolls 3 are mutually connected. The respective rotation axes of the pair of first rolls 3 are controlled so as to be separated from each other. In other words, the control unit 10 controls each of the pair of first rolls 3 in a direction in which the respective rotation surfaces of the pair of first rolls 3 are separated from each other.

  In the electrode manufacturing apparatus 1 and the surface inspection apparatus 2 configured as described above, the belt-like electrode M transported by the first transport unit 4 and the pressure-sensitive paper P transported by the second transport unit 5 are predetermined. It is sandwiched between a pair of second rolls 6 provided at intervals. Since the strip electrode M has a certain thickness, a certain pressure is applied to the strip electrode M and the pressure sensitive paper P. By the way, depending on the pressure applied to the surface of the pressure sensitive paper P, the color density of the surface of the pressure sensitive paper P changes. For this reason, the color density of the surface of the pressure-sensitive paper P after passing through the pair of second rolls 6 is larger than the color density of the surface of the pressure-sensitive paper P before passing through the pair of second rolls 6. Become.

  Here, when the foreign matter T adheres to the strip electrode M, the thickness of the region where the foreign matter T adheres in the strip electrode M is compared with the thickness of the region where the foreign matter T does not adhere in the strip electrode M. , The thickness of the foreign material increases. For this reason, when it is sandwiched between a pair of second rolls 6 provided at a predetermined interval, the pressure applied to the region of the pressure sensitive paper P facing the region where the foreign matter T adheres in the strip electrode M is the strip electrode M. , The pressure applied to the area of the pressure sensitive paper P facing the area where the foreign matter T is not attached becomes larger. Therefore, on the surface of the pressure-sensitive paper P after passing through the pair of second rolls 6, the region of the pressure-sensitive paper P facing the region where the foreign matter T adheres on the belt-like electrode M adheres to the foreign matter T on the belt-like electrode M. Compared with the area of the pressure-sensitive paper P facing the area that is not, the change in color density becomes larger.

  The surface of the pressure-sensitive paper P after passing through the pair of second rolls 6 is imaged by the imaging unit 8. The pressure density of the surface color of the imaged pressure sensitive paper P is detected by the pressure calculation unit 12, and the pressure applied to the pressure sensitive paper P is calculated based on the detected color density of the surface of the pressure sensitive paper P. When the calculated pressure is equal to or greater than a predetermined threshold, it can be seen that a larger pressure is applied to the area where the pressure on the pressure sensitive paper P is equal to or greater than the predetermined threshold. At this time, it is considered that the pressure applied to the region has increased due to the band-like electrode M to which the foreign matter T has adhered passing through the pair of second rolls 6. For this reason, even when the color of the foreign matter T is similar to the color of the strip electrode M, such as an aggregate of active material mixture, for example, the pressure applied to the pressure sensitive paper P based on the color density on the surface of the pressure sensitive paper P is reduced. By calculating, the foreign matter T adhering to the strip electrode M can be detected. Therefore, the detection accuracy of the foreign matter T can be improved.

  Further, in the electrode manufacturing apparatus 1, when the foreign matter T adhering to the strip electrode M is detected, the roll control unit 14 causes the pair of first rolls to move away from the rotation axes of the pair of first rolls 3. 3 is controlled. Thereby, it can avoid compressing the strip | belt-shaped electrode M to which the foreign material T has adhered, and it becomes possible to suppress that an indentation is formed in the rotating surface of a pair of 1st roll 3. FIG.

  As mentioned above, although embodiment which concerns on this invention was described, this invention is not limited to the said embodiment. For example, when the operator confirms the color of the surface of the pressure-sensitive paper P and detects the foreign matter T adhering to the belt-like electrode M, the surface inspection apparatus 2 does not need to include the imaging unit 8 and is an electrode manufacturing apparatus. 1 need not include the control unit 10.

  In the above-described embodiment, the case where it is detected whether or not the foreign matter T is attached to the strip electrode M based on the image of the surface of the pressure-sensitive paper P imaged by the imaging unit 8 has been described. Not. For example, the foreign matter T adhering to the strip electrode M may be detected by the operator confirming the color density on the surface of the pressure sensitive paper P after passing through the pair of second rolls 6. And when the foreign material T adhering to the strip | belt-shaped electrode M is detected, an operator controls a pair of 1st roll 3, and a pair of 1st roll in the direction where each rotating shaft of a pair of 1st roll 3 leaves | separates. 3 may be controlled.

  In the above-described embodiment, the imaging unit 8 may have the function of the control unit 10. In this case, the imaging unit 8 detects the foreign matter attached to the strip electrode M based on the color of the surface of the pressure-sensitive paper P that has been imaged. Then, the imaging unit 8 controls the distance between the pair of first rolls 3 based on the color of the surface of the pressure-sensitive paper P that has been imaged.

  In the above-described embodiment, the pressure calculation unit 12 calculates the pressure and compares the calculated pressure with a threshold value, but this configuration is not essential. For example, when using a single type of pressure sensitive paper, when the relationship between the color density of the developed color and the pressure is known, the pressure calculating unit 12 determines the surface of the pressure sensitive paper P from the image acquired by the imaging unit 8. The color density may be detected, and the detected color density of the surface of the pressure sensitive paper P may be compared with a predetermined color density threshold. In this case, the pressure calculation unit 12 may output a signal for controlling the pair of first rolls 3 to the roll control unit 14 when the detected density of the color is equal to or greater than the threshold value.

  DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus, 2 ... Surface inspection apparatus, 3 ... 1st roll, 4 ... 1st conveyance part, 5 ... 2nd conveyance part, 6 ... 2nd roll (roll), 8 ... Imaging part, 10 ... Control part, DESCRIPTION OF SYMBOLS 12 ... Pressure calculation part, A, B ... Conveyance direction, M ... Strip electrode, MA ... Active material mixture layer, ME ... Metal foil, P ... Pressure sensitive paper.

Claims (5)

A first transport unit that transports a strip electrode coated with an active material mixture on at least one surface of the metal foil;
A second transport unit that transports pressure-sensitive paper in the transport direction of the strip electrode;
A pair of rolls provided at a predetermined interval so as to sandwich the pressure sensitive paper and the strip electrode;
A surface inspection apparatus comprising: Provided further on the downstream side of the pair of rolls in the conveyance direction of the pressure sensitive paper, further comprising an imaging unit for imaging the surface of the pressure sensitive paper;
The surface inspection apparatus according to claim 1, wherein the imaging unit detects a foreign matter attached to the band-shaped electrode based on the imaged surface color of the pressure sensitive paper. A first transport unit that transports a strip electrode coated with an active material mixture on at least one surface of the metal foil;
A second transport unit that transports pressure-sensitive paper in the transport direction of the strip electrode;
A pair of first rolls provided so as to sandwich the strip electrode and compressing the strip electrode;
A pair of second rolls provided at a predetermined interval so as to sandwich the pressure sensitive paper and the strip electrode;
With
The pair of second rolls is an electrode manufacturing apparatus that is disposed upstream of the pair of first rolls in the transport direction of the strip electrode. An imaging unit that is provided on the downstream side of the pair of second rolls in the conveying direction of the pressure-sensitive paper, and that images the surface of the pressure-sensitive paper;
A control unit that controls the distance between the pair of first rolls based on the color of the surface of the pressure-sensitive paper imaged by the imaging unit;
The electrode manufacturing apparatus according to claim 3, further comprising:   The control unit includes a pressure calculation unit that calculates a pressure applied to the pressure-sensitive paper, and when the pressure calculated by the pressure calculation unit is equal to or greater than a predetermined threshold, the pair of first rolls is the strip electrode. The electrode manufacturing apparatus according to claim 4, wherein the distance is controlled such that a force for compressing the electrode is reduced.

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