JP2016184559A - Electrode roll press device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode roll press device which allows for noncontact removal of a foreign matter on the roll surface, even if the foreign matter adhering to the roll surface of a press roll is a part of an active material layer.SOLUTION: An electrode roll press device 10 including a pair of press rolls 17, 18 rotating relatively each other, and pressing an electrode sheet 11 between the pair of press rolls 17, 18, while conveying the electrode sheet 11 where the opposite sides of a strip metal foil are coated with an active material, further includes a voltage application mechanism 21 for applying a voltage to the pair of press rolls 17, 18, air knives 27, 28 provided while directing the gal outlets 29, 30 toward the roll surfaces 19, 20 of the pair of press rolls 17, 18, and a suction mechanism provided while facing the suction ports 33, 34 to the roll surfaces 19, 20 of the pair of press rolls 17, 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrode roll press apparatus that includes a pair of press rolls and pressurizes while conveying an electrode coated with an active material on both sides of a strip-shaped metal foil.

  As a conventional electrode roll press apparatus, for example, an electrode roll press apparatus 50 shown in FIG. 4 is known. The electrode roll press apparatus 50 shown in FIG. 4 includes a pair of press rolls 51 and 52 that are relatively rotated. A predetermined gap is provided between the press rolls 51 and 52, and an electrode sheet 53 having active material layers 55 and 56 on both sides of a strip-shaped metal foil 54 is passed through the gap between the press rolls 51 and 52. Thus, the electrode sheet 53 is pressurized while being conveyed. Pressure is applied by press rolls 51 and 52.

  In pressurization of the electrode sheet 53 by the press rolls 51 and 52, pressurization is performed while the electrode sheet 53 is continuously conveyed between the pair of press rolls 51 and 52. At this time, along with the continuous pressurization of the electrode sheet 53, a part of the active material in the active material layers 55 and 56 of the electrode sheet 53 may adhere to the surfaces of the press rolls 51 and 52 as foreign matter G. When the foreign matter G adheres to the surfaces of the press rolls 51 and 52 that perform pressurization, the active material layers 55 and 56 are pressurized while the foreign matter G is attached, and the active material layers 55 and 56 to be pressurized are recessed or Protrusions occur. If the active material layers 55 and 56 have recesses or protrusions, it is difficult to maintain the quality of the electrode sheet 53. In particular, in the case of a lithium ion secondary battery, if protrusions are generated in the active material layers 55 and 56 of the electrode sheet 53 serving as the positive electrode, there is a risk of causing lithium deposition. For this reason, the foreign matter G adhering to the surface of the press rolls 51 and 52 is removed by the scrapers 57 and 58 that are in contact with the surfaces of the press rolls 51 and 52.

  As another conventional technique related to the electrode roll press apparatus, for example, a polymer EL element disclosed in Patent Document 1 and a manufacturing method thereof can be cited. In the polymer EL device disclosed in Patent Document 1 and a method for producing the same, an organic light emitting layer is formed on a substrate on which one electrode is formed by a coating method or a printing method using a plate, It is a manufacturing method of the polymer EL element which forms one electrode. In addition, a plastic doctor blade, an air knife, or a rubber roll is used as the doctor blade of the coating apparatus or the printing apparatus.

JP 2003-59659 A

However, in the case of the prior art shown in FIG. 4, there are problems that the scraper causes scratches on the surface of the press roll and that the press roll thermally expands due to frictional heat between the scraper and the press roll. Since thermal expansion reduces the gap between the press rolls, the thickness of the electrode sheet after pressing becomes thinner than a preset thickness, resulting in variations in electrode thickness.
On the other hand, it is also conceivable to remove foreign matter from the surface of the press roll with the air knife described in Patent Document 1. However, when the foreign matter adhering to the surface of the press roll is a part of the active material layer, the material of the active material layer contains a binder, so the adhesion of the foreign matter to the surface of the press roll is strong. It is difficult to peel off the active material.

  The present invention has been made in view of the above problems, and the object of the present invention is to prevent foreign matter on the roll surface from contacting non-contact even if the foreign matter attached to the roll surface of the press roll is part of the active material layer. The present invention provides an electrode roll press apparatus that can be removed.

  In order to solve the above-described problems, the present invention includes a pair of press rolls that are provided with a pair of press rolls that rotate relative to each other, and that conveys an electrode sheet coated with an active material on both sides of a strip-shaped metal foil. In an electrode roll press apparatus that presses the electrode sheet in between, a voltage application mechanism that applies a voltage to the pair of press rolls, and an air knife that is provided with a gas outlet facing the roll surfaces of the pair of press rolls, And a suction mechanism provided with a suction port facing the roll surfaces of the pair of press rolls.

  In the present invention, even if a part of the active material of the electrode sheet adheres to the roll surface of the press roll as a foreign matter, a voltage is applied to the press roll, a repulsive force is generated between the press roll and the foreign matter, and the foreign matter becomes a press roller. It becomes easy to peel off. By blowing the air flow of the air knife against the foreign matter that is easily peeled off, the foreign matter is peeled off from the press roll, and the peeled foreign matter is sucked into the suction port by the suction action of the suction mechanism and collected. Therefore, even if the foreign material adhering to the roll surface is an active material, the foreign material on the roll surface can be removed without contact.

In the above electrode roll press apparatus, the foreign knife detector that detects the foreign substance on the roll surface of the pair of press rolls in a non-contact manner, and the air knife and the suction mechanism based on the foreign substance detection of the foreign substance detector. It is good also as a structure provided with the controller to control.
In this case, the foreign matter detector detects foreign matter on the roll surface of the press roll in a non-contact manner. The controller controls the air knife and the suction mechanism by detecting a foreign object by the foreign object detector. Therefore, the air knife and the suction mechanism can be operated only when necessary, and energy consumption due to the operation of the air knife and the suction mechanism can be suppressed as compared with the case where the air knife and the suction mechanism are always operated. .

In the electrode roll press device, the foreign object detector is downstream of the roll gap between the pair of press rolls in the rotation direction of the roll surface and upstream of the suction mechanism in the rotation direction of the roll surface. The controller may operate the air knife and the suction mechanism by detecting a foreign object by the foreign object detector.
In this case, when a foreign object adheres to the roll surface immediately after the electrode sheet is pressed, the foreign object detector detects the foreign object, and the controller activates the air knife and the suction mechanism by detecting the foreign object by the foreign object detector. Therefore, since the air knife and the suction mechanism are operated only when a foreign object is detected, energy consumption can be further suppressed.

Moreover, in said electrode roll press apparatus, it is good also as a structure by which the angle which the blowing direction of the gas from the gas blower outlet of the said air knife and the tangent of the said roll surface make is set in the range of 0-45 degrees.
In this case, the blowing direction of the gas by the air knife is a direction in which the foreign matter attached to the roll surface is easily peeled off, and the foreign matter on the roll surface can be peeled off from the roll surface.

  ADVANTAGE OF THE INVENTION According to this invention, even if the foreign material adhering to the roll surface of a press roll is a part of active material layer, the electrode roll press apparatus which can remove the foreign material in a roll surface by non-contact can be provided. .

It is a side view which shows the outline | summary of the electrode roll press apparatus which concerns on 1st Embodiment. It is a side view which shows the principal part of the electrode roll press apparatus which concerns on 1st Embodiment. It is a side view which shows the principal part of the electrode roll press apparatus which concerns on 2nd Embodiment. It is a side view which shows the outline | summary of the conventional electrode roll press apparatus.

(First embodiment)
Hereinafter, the electrode roll press apparatus according to the first embodiment will be described with reference to the drawings. The electrode roll press of this embodiment is a part of manufacturing equipment for manufacturing an electrode used in an electrode assembly included in a lithium ion secondary battery. The electrode assembly includes a positive electrode and a negative electrode as electrodes, and a separator interposed between the positive electrode and the negative electrode. This embodiment demonstrates the electrode roll press apparatus which pressurizes the electrode sheet which is a precursor of a positive electrode, when manufacturing the positive electrode as an electrode.

  First, the electrode sheet 11 pressed by the electrode roll press apparatus 10 shown in FIG. 1 will be described. The electrode sheet 11 of this embodiment includes a positive electrode metal foil 12 that is a band-shaped metal foil, and active material layers 13 and 14 that are formed by applying a coating material containing an active material on both surfaces of the positive electrode metal foil 12. It has. The active material layers 13 and 14 are formed of the same material, and the coating material forming the active material layer is mainly an active material, and includes a binder in addition to the active material. The active material layer 13 is positioned on the upper surface of the positive electrode metal foil 12 during horizontal conveyance of the electrode sheet 11, and the active material layer 14 is positioned on the lower surface of the positive electrode metal foil 12. The active material layers 13 and 14 are black with low brightness. The active material layers 13 and 14 of the electrode sheet 11 are formed at a certain interval in the longitudinal direction of the electrode sheet 11. The electrode sheet 11 is dried after the active material layers 13 and 14 are formed, and is wound on a winding roll 15.

  As shown in FIG. 1, the electrode sheet 11 fed out from the take-up roll 15 is pressed by the electrode roll press apparatus 10 and taken up by the take-up roll 16 while being transported horizontally. The electrode roll press device 10 is provided between the winding rolls 15 and 16. A rotation drive source (not shown) for rotating the take-up rolls 15 and 16 is provided. Although not shown, the winding rolls 15 and 16 include a wiring for grounding and a switch for switching between a grounding state and a non-grounding state. If the winding rolls 15 and 16 are grounded in a state where a potential is generated, the potential generated in the winding rolls 15 and 16 is canceled, and if the grounding state is not grounded, the potential generated in the winding rolls 15 and 16 is reduced. It will not be resolved.

  The electrode roll press apparatus 10 includes a pair of press rolls 17 and 18. The press rolls 17 and 18 are made of a conductive metal material and have the same structure with the same diameter. The press roll 17 is an upper press roll, and a roll surface 19 that is a pressing surface is formed on the press roll 17. The press roll 18 is a lower press roll, and the press roll 17 has a roll surface 20 as a pressing surface. A roll gap T is provided between the upper and lower press rolls 17 and 18. The roll gap T is set to the thickness of the electrode sheet 11 after pressing. The lowest point of the press roll 17 and the highest point of the press roll 18 that set the roll gap T are the maximum pressure points. The electrode roll press apparatus 10 is provided with an electric motor (not shown) as roll drive means for rotating the press rolls 17 and 18 in synchronization with each other. The rotation of the pair of press rolls 17 and 18 by the electric motor is a sufficiently low speed rotation. In addition, the roll surfaces 19 and 20 are silver white, and the brightness of the roll surfaces 19 and 20 is sufficiently larger than that of the active material layers 13 and 14.

  The electrode roll press apparatus 10 includes a voltage application mechanism 21 that applies a voltage to the pair of press rolls 17 and 18. The voltage application mechanism 21 includes a power source 22, a wiring 23 that connects the power source 22 and the pair of press rolls 17 and 18, a switch 24 provided on the wiring 23, and wirings 25 and 26 for grounding. The power source 22 is a DC power source, and the wiring 23 is connected to the negative electrode of the power source 22. When the switch 24 enters a position where the power source 22 and the wiring 23 are connected, when a voltage is applied to the press rolls 17 and 18, an applied potential is generated in the press rolls 17 and 18. When the foreign matter adhering to the roll surface 19 (20) is a part of the active material layer, the applied foreign matter is lifted from the roll surface 19 (20) by generating an applied potential to the pair of press rolls 17 and 18. A force to try will be generated. When the switch 24 enters a position where it is connected to the wiring 23 and the wiring 26, the applied potential generated in the press rolls 17 and 18 due to grounding is eliminated.

An air knife 27 is provided in the vicinity of the press roll 17, and an air knife 28 is provided in the vicinity of the press roll 18. The air knives 27 and 28 constitute a part of the electrode roll press apparatus 10.
As shown in FIG. 2, the air knife 27 includes a gas outlet 29 through which gas is blown out in a band shape. The gas outlet 29 has a width corresponding to the width of the press roll 17 and a height set sufficiently small with respect to this width. The gas outlet 29 is directed to the roll surface 19 of the press roll 17 from above the winding roll 15 side of the press roll 17. The blowing direction of the gas from the gas outlet 29 coincides with the tangential direction of the roll surface 19. That is, the angle formed by the gas blowing direction from the gas outlet 29 of the air knife 27 and the tangent to the roll surface 19 is 0 °. The purpose of making the gas blowing direction from the gas outlet 29 coincide with the tangential direction of the roll surface 19 is to make the foreign material most easily peeled from the roll surface 19. The attitude of the air knife 27 can be adjusted so that the angle formed between the gas blowing direction from the gas outlet 29 of the air knife 27 and the tangent to the roll surface 19 is in the range of 0 to 45 °.

  As shown in FIG. 2, the air knife 28 includes a gas outlet 30 through which gas is blown out in a band shape. The gas outlet 30 has a width corresponding to the width of the press roll 18 and a height set sufficiently small with respect to this width. The gas outlet 30 is directed from the lower side of the press roll 18 on the winding roll 15 side to the roll surface 20 of the press roll 18. The gas blowing direction from the gas outlet 29 coincides with the tangential direction of the roll surface 20. That is, the angle formed between the gas blowing direction from the gas outlet 30 of the air knife 28 and the tangent to the roll surface 20 is 0 °. The purpose of making the gas blowing direction from the gas outlet 30 coincide with the tangential direction of the roll surface 20 is to make the foreign material most easily peeled from the roll surface 20. The posture of the air knife 28 can be adjusted so that the angle formed between the gas blowing direction from the gas outlet 30 of the air knife 28 and the tangent to the roll surface 20 is in the range of 0 ° to 45 °. The gas blown out from the air knives 27 and 28 is preferably dry air. The reason for this is that when a gas containing moisture is blown out instead of dry air, the moisture of the blown-out gas becomes a pair of press rolls 17 and 18. It adheres to the roll surfaces 19 and 20. This is because the adhering moisture adheres to the electrode sheet 11 at the time of the next press, lowers the electrode sheet performance, and shortens the performance as a battery in which the electrode sheet 11 is assembled, such as a decrease in output and repeated life.

The electrode roll press apparatus 10 of the present embodiment is provided with a suction mechanism for sucking and collecting foreign matter peeled off from the roll surfaces 19 and 20. Specifically, the suction mechanism is a suction duct 31 that sucks foreign matter on the press roll 17 and a suction duct 32 that sucks foreign matter on the press roll 18.
As shown in FIG. 2, the suction duct 31 includes a suction port 33 that faces the roll surface 19 of the press roll 17. The suction port 33 is located upstream of the gas outlet 29 of the air knife 27 in the rotation direction of the press roll 17. In the present embodiment, the suction port 33 faces from the vicinity of the top of the roll surface 19 of the press roll 17 to the vicinity of the front. The suction port 33 has a width corresponding to the width of the press roll 17 and has a shape that follows the roll surface 19 in a range facing the press roll 17. The suction duct 31 is connected to a negative pressure generation source (not shown) such as a blower, and an air flow sucked from the roll surface 19 to the suction port 33 is formed by the operation of the negative pressure generation source. The suction duct 31 is connected to a collection container (not shown) for collecting the sucked foreign matter.

  As shown in FIG. 2, the suction duct 32 includes a suction port 34 that faces the roll surface 20 of the press roll 18. The suction port 34 is located upstream of the gas outlet 30 of the air knife 28 in the rotation direction of the press roll 18. In the present embodiment, the suction port 34 faces from the vicinity of the top of the roll surface 20 of the press roll 18 to the vicinity of the front. The suction port 34 has a width corresponding to the width of the press roll 18 and has a shape that follows the roll surface 20 in a range facing the press roll 18. The suction duct 32 is connected to a negative pressure source (not shown) such as a blower, and an air flow sucked from the roll surface 20 to the suction port 34 is formed by the operation of the negative pressure source. The suction duct 32 is connected to a collection container (not shown) for collecting the sucked foreign matter.

  The electrode roll press apparatus 10 of the present embodiment is provided with a foreign matter detector that detects the foreign matter on the roll surfaces 19 and 20 of the pair of press rolls 17 and 18 in a non-contact manner. Specifically, the foreign object detector is a camera 35 that images a foreign object on the roll surface 19 of the press roll 17 and a camera 36 that images a foreign object on the roll surface 20 of the press roll 18. The camera 35 is downstream of the roll gap T in the rotational direction of the roll surface 19 and in the rotational direction of the roll surface 19 so as to be able to image the roll surface 19 of the press roll 17 immediately after the electrode sheet 11 is pressed. 31 is located upstream. Therefore, the camera 35 is provided below the suction duct 31 so as to face the roll surface 19. The imaging range of the camera 35 is set to a range corresponding to the width of the roll surface 19 and corresponding to a part of the circumference of the roll surface 19.

  The camera 36 is positioned upstream of the suction duct 32 in the rotation direction of the press roll 18 so that the roll surface 20 of the press roll 18 immediately after the electrode sheet 11 is pressed can be imaged. Accordingly, the camera 36 is provided above the suction duct 32 so as to face the roll surface 20. The imaging range of the camera 36 is set to a range corresponding to the width of the roll surface 20 and corresponding to a part of the circumference of the roll surface 20. Each of the cameras 35 and 36 is a CCD camera or a C-MOS camera having a predetermined number of pixels, and image data captured by the cameras 35 and 36 are binarized. As shown in FIG. 1, the cameras 35 and 36 are electrically connected to a controller 37 that performs image processing.

  The controller 37 is electrically connected to the cameras 35 and 36 and is also electrically connected to the switch 24 and the air knives 27 and 28. Although not shown, the controller 37 is electrically connected to a rotation drive source for rotating the take-up rolls 15 and 16 and a negative pressure generation source included in the suction ducts 31 and 32. The controller 37 stores an image analysis program for analyzing image data transmitted from the cameras 35 and 36. Therefore, the controller 37 analyzes the binarized image data based on the image analysis program and determines the presence or absence of foreign matter on the roll surfaces 19 and 20.

  When the controller 37 determines that foreign matter is present on the roll surfaces 19 and 20, the controller 37 switches the switch 24 to a position where an applied potential is generated in the pair of press rolls 17 and 18, and the air knives 27 and 28 and the suction ducts 31 and 32. Activate the negative pressure source. The controller 37 switches the switch 24 to the original position after a predetermined time (for example, the time required for the pair of press rolls 17 and 18 to make a 1/2 rotation) to switch the air knives 27 and 28 and the suction ducts 31 and 32 to each other. Stop the operation of the negative pressure source. When the controller 37 determines that there is no foreign matter on the roll surfaces 19 and 20, the switch 24 is not switched, and the negative pressure generation sources of the air knives 27 and 28 and the suction ducts 31 and 32 are stopped. Keep state.

Next, the operation of the electrode roll press device 10 according to this embodiment will be described.
The electrode sheet 11 delivered from the take-up roll 15 passes between the pair of press rolls 17 and 18 and is pressurized by the pair of press rolls 17 and 18. The electrode sheet 11 that has been pressurized and passed between the pair of press rolls 17 and 18 is taken up by the take-up roll 16. In addition, the temperature of a pair of press rolls 17 and 18 rises by pressurizing an electrode sheet continuously. During the operation of the electrode roll press apparatus 10, the take-up rolls 15 and 16 are not grounded.

  The camera 35 always images the roll surface 19 of the press roll 17, and the camera 36 always images the roll surface 20 of the press roll 18. The roll surfaces 19 and 20 are imaged at positions upstream of the suction ducts 31 and 32 immediately after pressurization in the rotation direction of the roll surfaces 19 and 20. Imaging data of the cameras 35 and 36 is transmitted to the controller 37. The controller 37 analyzes the imaging data of the cameras 35 and 36. When the controller 37 determines that no foreign matter is present on the roll surfaces 19 and 20 based on the analysis of the imaging data, the switch 24 is not switched, and the negative pressures of the air knives 27 and 28 and the suction ducts 31 and 32 are not changed. The source remains stationary and is not activated.

  Incidentally, the controller 37 may determine that there is a foreign object on the roll surfaces 19 and 20 by analyzing the imaging data. That is, this is a case where a part of the active material layer of the electrode sheet 11 is peeled off and applied to the roll surfaces 19 and 20 when being pressed by the press rolls 17 and 18. The material of the active material layer also includes a binder and easily adheres to the roll surfaces 19 and 20. In particular, the active material is not evenly mixed and has spots, or the binder is agglomerated. If present, a part of the active material layer is easily peeled off. When the controller 37 determines that foreign matter is present on the roll surfaces 19 and 20, the switch 24 is switched to a position where an applied potential is generated in the pair of press rolls 17 and 18, and the air knives 27 and 28 and the suction ducts 31 and 32 are switched. Activate the negative pressure source.

  By switching the switch 24, the power source 22 and the wiring 23 are connected, and a voltage is applied to the press rolls 17 and 18. When a voltage is applied to the press rolls 17 and 18, an applied potential is generated in the press rolls 17 and 18. For example, as shown in FIG. 2, when a part of the active material layer adheres to the roll surface 19 as foreign matter G, an applied potential is generated in the press roll 17, so that the foreign matter G is floated from the roll surface 19. A force (repulsive force) is generated. Even if the foreign matter G is not completely peeled off from the roll surface 19, the outer edge portion of the foreign matter G floats from the roll surface 19 due to the repulsive force due to the applied potential.

  When the foreign object G approaches the air knife 27 by the rotation of the press roll 17 while receiving the repulsive force, the air current blown from the gas outlet 29 of the air knife 27 is received. Since the gas blowing direction from the gas outlet 29 coincides with the tangential direction of the roll surface 19, an air current enters between the outer edge of the foreign matter G and the roll surface 19, and the foreign matter G Together, they roll up and peel off from the roll surface 19. The air flow of the air knife 27 cools the press roll 17.

  The foreign matter G peeled off from the roll surface 19 rides on the airflow of the air knife 27 and reaches the suction port 33 of the suction duct 31 located on the downstream side of the airflow of the air knife 27. Due to the operation of the negative pressure generation source of the suction duct 31, a gas flow from the suction port 33 toward the inside of the suction duct 31 is generated in combination with the air flow of the air knife 27. For this reason, the foreign matter G is sucked into the suction duct 31 from the suction port 33, and finally collected in a collection container connected to the suction duct 31.

  The controller 37 switches the switch 24 to the original position and stops the operation of the negative pressure generating sources of the air knives 27 and 28 and the suction ducts 31 and 32 when a certain time has elapsed since it is determined that the foreign matter G exists. . The fixed time is a time required for the pair of press rolls 17 and 18 to make a 1/2 rotation after determining that the foreign matter G exists. In addition, although the case where the foreign material G adhered to the roll surface 19 of the press roll 17 was demonstrated, the foreign material G adhered to the roll surface 19 of the press roll 17 also when the foreign material adheres to the roll surface 20 of the press roll 18. Foreign matter is processed in the same manner as above. That is, the foreign matter is easily peeled off from the roll surface 20 due to the repulsive force generated by the applied potential of the press roll 18, and the foreign matter is peeled off from the roll surface 20 by the air flow of the air knife 28. Collected.

  When pressurization of the electrode sheet 11 by the electrode roll press device 10 is completed, the electrode sheet 11 is wound around the take-up roll 16, and the electrode sheet 11 is not present on the take-up roll 15. At this time, the winding rolls 15 and 16 are switched to the grounded state, and the potentials of the winding rolls 15 and 16 generated through the electrode sheet 11 during operation of the electrode roll press apparatus 10 are eliminated. After the potentials of the winding rolls 15 and 16 are eliminated, the operator may perform setup for pressurization of the next electrode sheet 11.

The electrode roll press apparatus of this embodiment has the following effects.
(1) Even if a part of the active material of the electrode sheet 11 adheres to the surface of the press roll 17 (18) as a foreign matter, a voltage is applied to the press roll 17 (18), and the press roll 17 (18) and the foreign matter A repulsive force is generated between them, and the foreign matter is easily peeled off from the press roll 17 (18). By blowing the air flow of the air knife 27 (28) against the foreign matter that is easily peeled off, the foreign matter is peeled off from the press roll 17 (18), and the peeled foreign matter is sucked into the suction port 33 ( 34) and collected. Therefore, even if the foreign material adhering to the roll surface 19 (20) is an active material, the foreign material on the roll surface 19 (20) can be removed without contact.

(2) The camera 35 (36) as the foreign matter detector detects foreign matter on the roll surface 19 (20) of the press roll 17 (18) in a non-contact manner. The controller 37 controls the air knife 27 (28) and the suction duct 31 (32) by detecting foreign matter by the camera 35 (36). Therefore, the air knife 27 (28) and the suction duct 31 (32) can be operated only when a foreign object is detected. Therefore, compared with the case where the air knife 27 (28) and the suction duct 31 (32) are always operated, energy consumption due to the operation of the air knife 27 (28) and the suction duct 31 (32) can be suppressed.

(3) The direction in which the gas is blown out by the air knife 27 (28) is a direction that facilitates the removal of foreign matter adhering to the roll surface 19 (20), and the foreign matter on the roll surface 19 (20) is peeled off from the roll surface 19 (20). be able to.

(4) Since the air knife 27 (28) operates when a foreign object is detected, the press roll 17 (18) can be cooled by the gas blown from the air knife 27 (28). By cooling the press roll 17 (18), excessive thermal expansion of the press roll 17 (18) is suppressed, and variation in the distance between the press rolls 17 and 18 due to thermal expansion can be suppressed.

(Second Embodiment)
Next, an electrode roll press apparatus according to a second embodiment will be described. This embodiment is different from the first embodiment in that the position of the camera as the foreign object detector is different from that of the first embodiment, and that the air knife and the suction duct are always operated during normal times. In the present embodiment, the description of the first embodiment is used for the same configuration as the first embodiment, and the same reference numerals are used for the common configuration.

  In the electrode roll press apparatus 40 shown in FIG. 3, the camera 35 is upstream of the roll gap T in the rotation direction of the roll surface 19 so that the roll surface 19 of the press roll 17 before pressing the electrode sheet 11 can be imaged. It is located downstream of the air knife 27 in the rotation direction of the roll surface 19. Therefore, the camera 35 is provided below the air knife 27 so as to face the roll surface 19. The camera 36 is positioned downstream of the air knife 27 in the rotation direction of the press roll 18 so that the roll surface 20 of the press roll 18 before pressing the electrode sheet 11 can be imaged. Therefore, the camera 36 is provided above the air knife 27 so as to face the roll surface 20.

  The controller 37 of the present embodiment performs control to always operate the voltage application mechanism 21, the air knives 27 and 28, and the suction ducts 31 and 32 during normal operation. For this reason, even if foreign matter adheres to the roll surface 19 (20), the foreign matter is easily peeled off from the roll surface 19 (20) due to repulsive force generated by the applied potential of the press roll 17 (18). The foreign matter is peeled off from the roll surface 19 (20) by the air flow of the air knife 27 (28), and the peeled foreign matter is sucked into the suction duct 31 (32) and collected.

  For example, as shown in FIG. 3, when the camera 35 images the foreign object G and the controller 37 determines that there is a foreign object by analyzing the captured data, the controller 37 performs control to stop the operation of the electrode roll press device 40. That is, the rotation drive source of the take-up rolls 15 and 16, the roll drive source of the pair of press rolls 17 and 18, the air knives 27 and 28, and the negative pressure suction source of the suction duct are stopped, and the voltage application mechanism. 21 switch 24 is switched to the ground side. In this case, the operator removes the foreign matter in a state where the operation of the electrode roll press device 40 is stopped.

  The electrode roll press device 40 of this embodiment has the same effect as the effect (1) of the first embodiment. Further, according to this embodiment, when the foreign matter does not peel from the roll surfaces 19 and 20 due to repulsive force generated by the applied potential of the press rolls 17 and 18 and the air current of the air knives 27 and 28, the entire apparatus is stopped and the foreign matter is removed. The electrode sheet is not pressurized while attached. Further, in the state where no foreign matter exists on the roll surfaces 19 and 20, the air knives 27 and 28 always blow the gas to the press rolls 17 and 18, so that the press rolls 17 and 18 are always cooled, and the heat of the press rolls 17 and 18 is kept. Expansion can be suppressed.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment, the electrode roll press device that pressurizes the electrode sheet that is the precursor of the positive electrode is used. However, an electrode roll press device that pressurizes the electrode sheet that is the precursor of the negative electrode may be used. In the above embodiment, the active material layer is an electrode sheet formed with a predetermined interval, but it is not limited to a child. The electrode sheet in which the active material layer is continuously formed may be used.
In the above embodiment, the camera is used as the foreign object detection body for detecting the foreign object attached to the roll surface, but the foreign object detection body is not limited to the camera. You may use the chromaticity sensor which measures the chromaticity of a target object. In this case, a moving mechanism that scans the chromaticity sensor so as to reciprocate in the width direction of the roll surface may be provided.
In the above embodiment, the angle formed between the air blowing direction of the air knife and the tangent to the roll surface is set to 0 °, but it is not limited to 0 °. The angle formed between the gas blowing direction from the gas outlet of the air knife and the tangent to the roll surface is preferably in the range of 0 to 45 °, and the most preferable angle is 0 °. The reason why the angle formed between the air blowing direction of the air knife and the tangent to the roll surface is set to 0 to 45 ° is as follows. An angle of 0 ° is the most preferable because the force of peeling is the largest when the gas of the air knife is ejected between the boundary portion of the surface of the roll to which foreign matter has adhered. As the angle formed between the gas blowing direction from the air knife outlet and the tangent to the roll surface increases, the force to peel off the foreign matter from the roll surface decreases, and the force contrary to the above, that is, the force to hold the foreign matter against the roll surface is reduced. Since it becomes large, 45 degrees or less is preferable.
In the above embodiment, the DC power source is used for applying a voltage to the pair of press rolls, but not limited to the DC power source, an AC power source may be used. When an AC power supply is used, repulsive force against foreign matter adhering to the roll surface is periodically generated, and adhesion of foreign matter to the roll surface can be further weakened.

10, 40, 50 Electrode roll press device 11, 53 Electrode sheet 12, 54 Positive electrode metal foil 13, 14, 55, 56 Active material layer 15 Winding roll (feeding side)
16 Winding roll (winding side)
17, 18 Press roll 19, 20 Roll surface 21 Voltage application mechanism 24 Switch 27, 28 Air knife 29, 30 Air outlet 31, 32 Suction duct 33, 34 Suction port 35, 36 Camera 37 Controller 57, 58 Scraper
T Roll gap G Foreign matter

Claims (4)

An electrode roll press device that includes a pair of press rolls that rotate relative to each other and that presses the electrode sheet between the pair of press rolls while conveying an electrode sheet coated with an active material on both sides of a strip-shaped metal foil In
A voltage application mechanism for applying a voltage to the pair of press rolls;
An air knife provided with a gas outlet facing the roll surface of the pair of press rolls;
An electrode roll press apparatus comprising: a suction mechanism provided with a suction port facing the roll surfaces of the pair of press rolls. A foreign matter detector for detecting non-contact foreign matter on the roll surface of the pair of press rolls;
The electrode roll press apparatus according to claim 1, further comprising: a controller that controls the air knife and the suction mechanism based on detection of a foreign object by the foreign object detection body. The foreign object detector is provided downstream of the roll gap between the pair of press rolls in the rotation direction of the roll surface, and upstream of the suction mechanism in the rotation direction of the roll surface,
3. The electrode roll press apparatus according to claim 2, wherein the controller operates the air knife and the suction mechanism by detecting a foreign object by the foreign object detector.   The angle formed between the blowing direction of the gas from the gas outlet of the air knife and the tangent to the roll surface is set in the range of 0 to 45 °. The electrode roll press apparatus of description.

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