JP2016095987A - Method of manufacturing electrode and cleaning device of electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suggest a method of manufacturing an electrode which allows for cleaning of the cut end face of a strip electrode, without causing any damage thereon, and to suggest a cleaning device of an electrode.SOLUTION: A cleaning device 1 of an electrode for cleaning the cut end face Aa of a strip electrode A, where active material layers B1, B2 are formed on a strip metal foil C, after the end of which is cut, includes a first injection unit 2 having a first injection port (e.g., a first nozzle 20) arranged on one side of the strip electrode A, and injecting gas from the first injection port to the cut end face Aa of a strip electrode A during transport thereof, and a second injection unit 3 having a second injection port (e.g., a second nozzle 30) arranged on the other side of the strip electrode A, and injecting gas from the second injection port to the cut end face Aa of the strip electrode A during transport thereof.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrode manufacturing method and an electrode cleaning apparatus.

  When manufacturing the electrode used for a lithium ion secondary battery etc., there exists a process of cut | disconnecting the edge part of the strip | belt-shaped electrode in which the active material layer was formed in strip | belt-shaped metal foil. After this step, the active material contained in the active material layer may protrude from the cut end face of the strip electrode. If the protruding active material or the like is peeled off from the cut end surface after the electrode is incorporated in the battery, it may cause an internal short circuit of the battery. Then, in order to remove the active material etc. which protruded from the cut cross section, for example, patent document 1 discloses sucking while applying a brush to the cut end surface in the horizontal direction.

JP 2009-187690 A

  However, when removing using a brush as disclosed in Patent Document 1, it is necessary to strongly press the brush against the cut end surface. Therefore, there is a possibility that damage such as scratches may be given to the cut end face.

  Therefore, an object of the present invention is to propose an electrode manufacturing method and an electrode cleaning apparatus capable of cleaning the cut end face without damaging the cut end face of the strip electrode.

  An electrode manufacturing method according to one aspect of the present invention is a method for manufacturing an electrode including a cutting step of cutting an end portion of a band-shaped electrode in which an active material layer is formed on a band-shaped metal foil. In addition, the first injection step of injecting gas from one surface side of the strip electrode to the cut end surface of the strip electrode whose end portion has been cut in the cutting step, and the strip shape in which the end portion was cut in the cutting step during the transport of the strip electrode And a second injection step of injecting gas from the other surface side of the strip electrode to the cut end face of the electrode.

  In this electrode manufacturing method, gas is ejected from one side and the other side of the strip electrode to the cut end surface of the strip electrode, thereby spraying gas from two different directions onto the active material that protrudes from the cut end surface. Remove active material. Since gas is used in this way, the cut end face can be cleaned without damaging the cut end face of the strip electrode.

  In the electrode manufacturing method of one embodiment, the first injection step and the second injection step are performed alternately. Thereby, since the gas injected from the one surface side and the gas injected from the other surface side are alternately injected, the gas from two different directions interferes and does not weaken.

  The electrode manufacturing method according to one embodiment includes a pressing step of pressing the active material layer of the strip electrode after the cutting step, and the first injection step and the second injection step are performed after the pressing step. When the pressing process is performed after the cutting process, the active material or the like easily protrudes from the cutting end face, and thus the necessity for cleaning the cutting end face is high.

  An electrode cleaning apparatus according to one aspect of the present invention is an electrode cleaning apparatus that cleans a cut end surface of a strip electrode after the end of the strip electrode in which an active material layer is formed on the strip metal foil is cut. The first injection port is disposed on one surface side of the belt-like electrode, and a first injection portion that injects gas from the first injection port to the cut end surface of the belt-like electrode during conveyance of the belt-like electrode, and on the other surface side of the belt-like electrode A second injection port is disposed, and a second injection unit that injects gas from the second injection port to the cut end surface of the band electrode during conveyance of the band electrode.

  In this electrode cleaning apparatus, by injecting gas from the first injection port and the second injection port arranged on the one surface side and the other surface side of the band electrode, the band electrode is applied to the active material protruding from the cut end surface. A gas is blown from one side and the other side to remove the protruding active material. Thereby, the cut end face can be cleaned without damaging the cut end face of the strip electrode.

  In the electrode cleaning device of one embodiment, the first injection unit and the second injection unit alternately inject gas at different injection timings. With this configuration, gas is alternately injected from the first injection port and the second injection port, so that the gas injected from the first injection port and the gas injected from the second injection port interfere and weaken each other. Absent.

  In the electrode cleaning apparatus according to the embodiment, the first injection port and the second injection port are arranged at a predetermined interval in the transport direction of the strip electrode. With this configuration, since the gas injected from the first injection port and the gas injected from the second injection port are injected to different locations in the transport direction, the gas injected from the first injection port and the second injection port It does not weaken due to interference with the gas injected from.

  In the electrode cleaning device of one embodiment, the first injection unit and the second injection unit inject gas toward the downstream side in the transport direction of the strip electrode. With this configuration, since the active material or the like removed from the cut end face is blown to the downstream side in the transport direction, it can be prevented that the active material or the like becomes a foreign substance in the previous step performed on the upstream side in the transport direction.

  In the electrode cleaning device according to the embodiment, the first injection unit and the second injection unit inject gas toward the outside in the width direction of the strip electrode. With this configuration, the active material or the like removed from the cut end face is blown to the outside in the width direction of the strip electrode, so that the active material or the like can be prevented from adhering to the surface of the active material layer of the strip electrode.

  According to the present invention, the cut end face can be cleaned without damaging the cut end face of the strip electrode.

It is a figure which shows typically the cleaning apparatus of the electrode which concerns on one Embodiment, Fig.1 (a) is a side view, FIG.1 (b) is a front view. It is a block diagram which shows the supply path | route of the compressed air of the cleaning apparatus of FIG. It is an enlarged view which shows an example of the cut end surface of a strip electrode. It is a figure which shows the other example of arrangement | positioning of a 1st nozzle and a 2nd nozzle, and Fig.4 (a) is a case where it injects in a different position in a conveyance direction, FIG.4 (b) injects to the downstream of a conveyance direction. This is a case, and FIG. 4 (c) shows a case of injecting to the outside in the width direction.

  Hereinafter, an electrode manufacturing method and an electrode cleaning apparatus according to an embodiment of the present invention will be described 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.

  In one embodiment, the present invention is applied to an electrode cleaning device used in a cleaning process for cleaning a cut end surface of a strip electrode, which is a process for manufacturing a battery electrode. In this embodiment, before the cleaning process, a slit process (cutting process) for cutting the end portion of the strip electrode and a pressing process for pressing the active material layer of the strip electrode after the slit process are performed. The manufactured electrode is used for power storage devices such as a secondary battery and an electric double layer capacitor. The secondary battery is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. Moreover, the manufactured electrode may be used for a primary battery. In this embodiment, it is assumed that an electrode used for a lithium ion secondary battery is manufactured.

  The electrode has an active material layer formed by applying an electrode paste on at least one surface of a metal foil. The electrode has a tab on which an active material layer is not formed at the end of the metal foil. The metal foil is, for example, an aluminum foil in the case of the positive electrode, and a copper foil or a nickel foil in the case of the negative electrode. The electrode paste is in the form of a slurry having a predetermined viscosity and includes an active material, a binder, a solvent, and the like. The active material is a positive electrode active material or a negative electrode active material. The positive electrode active material is, for example, a composite oxide or a sulfur-based material. The composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium. Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as 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 is, for example, a fluorine-containing resin such as polyvinylidene fluoride, polytetrafluoroethylene, or fluorine rubber, a thermoplastic resin such as polypropylene or polyethylene, an imide resin such as polyimide or polyamideimide, or an alkoxysilanol group-containing resin. Examples of the solvent include organic solvents such as NMP (N-methylpyrrolidone), methanol, and methyl isobutyl ketone, and water. The electrode paste may contain a conductive auxiliary such as carbon black, graphite, acetylene black, and ketjen black (registered trademark). The electrode paste may contain a thickening agent such as carboxymethylcellulose (CMC).

  When producing an electrode, the kneading step of kneading each of the above substances to produce an electrode paste, the coating step of coating the electrode paste on a strip-shaped metal foil, the drying step of drying the coated electrode paste, etc. A band-shaped electrode is produced in which an active material layer is formed on a band-shaped metal foil. Further, individual electrodes can be obtained from the strip electrode by a slitting process, a pressing process, a cleaning process, a punching process of punching an electrode from the strip electrode, and the like. In addition to the above steps, there are other steps such as baking and inspection as steps for manufacturing the electrode.

  With reference to FIG.1 and FIG.2, the cleaning apparatus 1 of the electrode which concerns on one Embodiment is demonstrated. FIG. 1 is a diagram schematically showing the cleaning device 1. FIG. 2 is a block diagram illustrating a compressed air supply path of the cleaning device 1.

  The slit process and the pressing process will be briefly described. The slitting step is a step of cutting an extra portion (a portion where mainly the active material layer is not formed) at both end portions in the width direction of the strip electrode. In the slitting process, a shear-cut type slitter is used. The slitter includes an upper blade and a lower blade of a round blade, and cuts the end of the belt-like electrode being conveyed at a portion where the upper blade and the lower blade overlap. The pressing step is a step of pressing the active material layer of the strip electrode. In the pressing process, a roll press apparatus is used. As shown in FIG. 1, the roll press apparatus includes a pair of upper and lower press rolls R1 and R2, and sandwiches and presses the active material layers B1 and B2 of the belt-like electrode A being conveyed between the press rolls R1 and R2. In addition, this invention is applicable also when cut | disconnecting only the one end part of the width direction of a strip | belt-shaped electrode at a slit process. The present invention can also be applied to the case where the active material layer is formed only on one surface of the strip electrode. FIG. 1 shows the case where the active material layers B1 and B2 are formed by intermittent coating, but the present invention can also be applied to the case where the active material layer is formed by continuous coating.

  After cutting the end portion of the strip electrode A in the slit process, as shown in FIG. 1B, the cut end surface Aa of the strip electrode A is composed of the end surface of the strip metal foil C and the end surfaces of the active material layers B1 and B2. . When the active material layers B1 and B2 of the strip electrode A are pressed in the pressing step, the active material layers B1 and B2 are compressed, and the density of the active material layers B1 and B2 is increased. When the active material layers B1 and B2 are compressed, the active material contained in the active material layers B1 and B2 may protrude from the cut end surface Aa (see FIG. 3). In this embodiment, the protrusion from the cut end surface Aa is referred to as “floating D”. In the cleaning process using the cleaning device 1, the float D is removed without damaging the cut end surface Aa.

  This cleaning process and the like are performed while the strip electrode A is being transported. Prior to conveyance, the strip electrode A is wound into a roll around an unwinding roll (not shown). During conveyance, the strip electrode A is fed out from the unwinding roll and wound up by a winding roll (not shown). A predetermined tension (tension) is applied to the belt-like electrode A being conveyed. In FIG. 1, a direction in which the strip electrode A is conveyed is indicated by an arrow E. This transport direction E is orthogonal to the width direction of the strip electrode A being transported. The cleaning process is performed on the downstream side of the pressing process in the transport direction E. In the present embodiment, as shown in FIG. 1, this is applied to the case where the strip electrode A is transported in a horizontal plane, but the present invention is transported in a plane inclined by a predetermined angle with respect to the horizontal plane. It can also be applied.

  Now, the cleaning device 1 will be described. The cleaning device 1 cleans the cut end faces Aa and Aa at both ends in the width direction of the belt-like electrode A being conveyed immediately after the pressing step. In this cleaning, air (air) is alternately ejected from the one surface side and the other surface side of the strip electrode A at a high speed onto the cut end surface Aa. For this purpose, the cleaning device 1 includes a first injection unit 2 and a second injection unit 3. The gas to be injected may be a gas such as nitrogen other than air.

  The first injection unit 2 injects compressed air at a high speed from one surface side of the strip electrode A (the side on which one active material layer B1 is formed and the upper side in the example shown in FIG. 1) to the cut end surface Aa. The first injection unit 2 includes first nozzles (first injection ports) 20 and 20, valves 21 and 21, an air tank 22, a regulator 23, a pressure gauge 24, a filter 25, and an air supply source 26.

  The first nozzles 20 and 20 are nozzles that inject compressed air at high speed from above the strip electrode A along the cut end surface Aa. The first nozzles 20 and 20 are disposed on the downstream side of the press roll R1 and on one surface side (upper side) of the strip electrode A. The first nozzles 20 and 20 are arranged perpendicular to the belt electrode A being transported so that the jet direction F1 of the compressed air is perpendicular to the belt electrode A being transported. Accordingly, the ejection direction F1 of the first nozzles 20 and 20 is orthogonal to the transport direction E of the strip electrode A. One first nozzle 20 is disposed above the cut end surface Aa at one end in the width direction of the strip electrode A. The other first nozzle 20 is disposed above the cut end surface Aa at the other end in the width direction of the strip electrode A. Valves 21 and 21 are connected to the first nozzles 20 and 20 by pipes 20a and 20a.

  The valves 21 and 21 are valves that supply / stop supply of compressed air to the first nozzles 20 and 20. The valves 21 and 21 open and close every predetermined time. Therefore, the valves 21 and 21 repeat the open state (supply of compressed air) for a predetermined time and the closed state (stop of supply of compressed air) for a predetermined time. The predetermined time is appropriately set to a time suitable for cleaning the cut end surface Aa. The opening / closing control of the valves 21 and 21 is performed by a control device (not shown). This control device may be a control device dedicated to the cleaning device 1 or may be a control device for an electrode production line. The valves 21 and 21 are connected to the air tank 22 by pipes 21a and 21a.

  The air tank 22 is a tank that stores the compressed air adjusted by the regulator 23. The regulator 23 is a pressure regulator that adjusts the pressure of air supplied from the air supply source 26 to a set pressure based on the pressure value of air measured by the pressure gauge 24. The set pressure is appropriately set to a pressure suitable for cleaning the cutting end surface Aa. The pressure gauge 24 is a pressure gauge that detects the pressure of air supplied from the air supply source 26. The filter 25 is a filter that removes dust, dust, and the like from the air supplied from the air supply source 26. The air supply source 26 is a device that compresses and supplies air, and includes a compressor or the like.

  The second injection unit 3 injects compressed air from the other surface side of the strip electrode A (the side on which the other active material layer B2 is formed, the lower side in the example shown in FIG. 1) onto the cut end surface Aa at high speed. To do. The second injection unit 3 includes second nozzles (second injection ports) 30 and 30, valves 31 and 31, an air tank 32, a regulator 33, a pressure gauge 34, a filter 35, and an air supply source 36.

  The second nozzles 30 and 30 are nozzles that inject compressed air at a high speed along the cut end surface Aa from below the strip electrode A. The second nozzles 30 are arranged on the downstream side of the press roll R2 and on the other surface side (lower side) of the strip electrode A. The second nozzles 30 and 30 are arranged perpendicular to the belt-like electrode A being conveyed so that the jet direction F2 of compressed air is perpendicular to the belt-like electrode A. Therefore, the ejection direction F2 of the second nozzles 30 and 30 is orthogonal to the transport direction E of the strip electrode A. The air injection direction F2 of the second nozzles 30 and 30 is opposite to the air injection direction F1 of the first nozzles 20 and 20. One second nozzle 30 is disposed opposite to the first nozzle 20, and is disposed below the cut end surface Aa at one end in the width direction of the strip electrode A. The other second nozzle 30 is disposed opposite the other first nozzle 20 and is disposed below the cut end surface Aa at the other end in the width direction of the strip electrode A. Valves 31, 31 are connected to the second nozzles 30, 30 by pipes 30a, 30a.

  The valves 31 and 31 are valves that perform supply / stop of supply of compressed air to the second nozzles 30 and 30. Similar to the valves 21 and 21, the valves 31 and 31 are valves that open and close every predetermined time. Further, the valves 31 and 31 open and close with the opening and closing timings of the valves 21 and 21 of the first injection unit 2 shifted. Therefore, the valves 31 and 31 are opened when the valves 21 and 21 are closed, and are closed when the valves 21 and 21 are opened. The opening / closing control of the valves 31, 31 is controlled by the control device described above. The valves 31 and 31 are connected to the air tank 32 by pipes 31a and 31a.

  The air tank 32, the regulator 33, the pressure gauge 34, the filter 35, and the air supply source 36 are the same as the air tank 22, the regulator 23, the pressure gauge 24, the filter 25, and the air supply source 26 of the first injection unit 2. Is omitted. In this embodiment, the air tank 22 of the first injection unit 2, the regulator 23, the pressure gauge 24, the filter 25, the air supply source 26 and the air tank 32 of the second injection unit 3, the regulator 33, the pressure gauge 34, the filter 35, the air Although configured separately from the supply source 36, the first injection unit 2 and the second injection unit 3 may share the supply source 36.

  The operation of the cleaning apparatus 1 will be described with reference to FIG. 3 in addition to FIGS. FIG. 3 is an enlarged view showing an example of the cut end surface Aa of the strip electrode A. FIG. In the example shown in FIG. 3, the floating D is generated on the cut end surface Aa. The strip electrode A is transported in the transport direction E, and the following slit process, press process, and cleaning process by the cleaning device 1 are performed during the transport. In the first injection unit 2 of the cleaning device 1, the compressed air supplied from the air supply source 26 is adjusted to a set pressure by the regulator 23, and the adjusted compressed air is stored in the air tank 22. In the second injection unit 3, the compressed air supplied from the air supply source 36 is adjusted to a set pressure by the regulator 33, and the adjusted compressed air is stored in the air tank 32.

  In the slitting process, excess portions at both ends of the strip electrode A are cut by a slitter. Subsequently, in the pressing step, the active material layer B1 on one side of the strip electrode A and the active material layer B2 on the other side are pressed by a pair of press rolls R1, R2. Subsequent to this pressing step, the following cleaning step is performed.

  In the first injection unit 2, the valves 21 and 21 open and close at different timings from the valves 31 and 31 every predetermined time, and the first nozzle 20 and 20 cut one end face Aa and the other end face Aa of the strip electrode A. Compressed air is injected at a high speed (first injection step). Further, in the second injection unit 3, the valves 31 and 31 are opened and closed at different timings from the valves 21 and 21 at predetermined time intervals, and one cut end face Aa of the strip electrode A and the other cut from the second nozzles 30 and 30. Compressed air is injected at a high speed onto the end surface Aa (second injection step). At this time, the injection of the second nozzles 30 and 30 is stopped while the first nozzles 20 and 20 are injecting for a predetermined time, and the first nozzles 20 and 30 are injecting while the second nozzles 30 and 30 are injecting for a predetermined time. 20 injections stop.

  As a result, the compressed air in the injection direction F1 from the upper side to the lower side and the compressed air in the injection direction F2 from the lower side to the upper side are alternately jetted onto the cut end surfaces Aa and Aa at both ends of the strip electrode A. Since the air is alternately injected in this way, the compressed air in the injection direction F1 and the compressed air in the injection direction F2 do not interfere and weaken each other. Since the cut end face Aa is only blown with air, which is a gas, it does not receive damage such as scratches.

  The compressed air in the jetting direction F1 and the jetting direction at very short intervals so that the compressed air in the jetting direction F1 and the compressed air in the jetting direction F2 are alternately blown to the same portion of the cut end surface Aa of the strip electrode A being conveyed. The compressed air of F2 is switched. In particular, it is desirable that the compressed air in the injection direction F1 and the compressed air in the injection direction F2 are alternately sprayed a plurality of times on the same location. For this reason, the predetermined time is set to a very short time, for example, 0.06 seconds to 0.09 seconds. The predetermined time may be set in consideration of the transport speed of the strip electrode A, the jet speed of compressed air, and the like.

  As shown in FIG. 3, when the floating D is generated on the cut end surface Aa, the compressed air in the injection direction F1 and the compressed air in the injection direction F2, which are opposite directions, are alternately blown onto the floating D. Accordingly, the float D is bent downward by the compressed air in the injection direction F1 and bent upward by the compressed air in the injection direction F2, and the bending in the reverse direction is repeated. Thereby, since the float D is brittle, it is broken at the portion of the root Da indicated by a broken line. The broken float D is blown away. As a result, the floating D is removed from the cut end surface Aa of the strip electrode A.

  According to this cleaning device 1, the floating D is removed from the cut end surface Aa by alternately blowing the compressed air in the injection direction F1 and the compressed air in the injection direction F2 against the float D of the cut end surface Aa of the strip electrode A. To do. Since the cleaning is performed by using air (gas) in this way, the cut end surface Aa can be cleaned without damaging the cut end surface Aa of the strip electrode A. Further, since the float D can be removed from the cut end surface Aa, a re-slit process for removing the float D after the pressing process is not necessary. Therefore, there is no material loss for the cutting allowance when the re-slit process is performed. Moreover, after the manufactured electrode is incorporated in the battery, it is possible to prevent an internal short circuit of the battery due to the floating D (active material, etc.) coming off from the end face of the electrode.

  According to the cleaning device 1, the compressed air in the injection direction F1 and the compressed air in the injection direction F2 are generated by the first injection unit 2 and the second injection unit 3 alternately injecting compressed air at different injection timings. Strong compressed air can be blown against the float D without interfering and weakening.

  According to the cleaning device 1, since the first injection port of the first injection unit 2 and the second injection port of the second injection unit 3 are constituted by the nozzles 20 and 30, the compressed air is suppressed while suppressing the diffusion of the compressed air. Can be jetted at high speed. Therefore, strong air can be blown in a narrow range with respect to the cut end surface Aa. In addition, as a 1st injection port of the 1st injection part 2, and a 2nd injection port of the 2nd injection part 3, what used the hole with a small diameter other than using a nozzle may be used. In particular, by providing a hole having a predetermined length (that is, a long and narrow passage for compressed air), it is possible to inject compressed air as in the case of using a nozzle.

  With reference to FIG. 4, another arrangement example of the first nozzle 20 and the second nozzle 30 will be described. Here, three examples shown in FIGS. 4A to 4C will be described.

  FIG. 4A shows an arrangement example in the case where the first nozzle 20A and the second nozzle 30A eject at different positions in the transport direction E. The first nozzle 20A is arranged at a predetermined position in the transport direction E. The second nozzle 30A is disposed on the downstream side by a predetermined distance from the first nozzle 20A in the transport direction E. This predetermined distance is such that even when the first nozzle 20A and the second nozzle 30A are simultaneously injecting compressed air, the compressed air in the injection direction F1 from the first nozzle 20A and the compression in the injection direction F2 from the second nozzle 30A It is a sufficient distance that does not interfere with air. The predetermined distance is appropriately set in consideration of the injection range of compressed air from the first nozzle 20A and the second nozzle 30A.

  In the case where the first nozzle 20A and the second nozzle 30A are arranged at a predetermined interval, the cutting end surface Aa of the strip electrode A being conveyed can be obtained without shifting the ejection timing of the first nozzle 20A and the second nozzle 30A. The compressed air in the injection direction F1 and the compressed air in the injection direction F2 can be alternately blown against the same portion (particularly, the float D). Therefore, the valve 21 and the valve 31 may be opened and closed at a shifted timing, but may be opened and closed at the same timing. Further, since compressed air may be continuously ejected from the first nozzle 20A and the second nozzle 30A, a configuration in which the valves 21 and 31 for supplying / stopping the supply of compressed air to the nozzles 20A and 30A are not provided. Good. In this case, it is not necessary to perform opening / closing control on the valves 21 and 31. In the case of the arrangement of the first nozzle 20A and the second nozzle 30A, the compressed air in the injection direction F1 and the compressed air in the injection direction F2 are not controlled without controlling the injection timing of the first nozzle 20A and the second nozzle 30A. There is no weakening due to interference. Therefore, the control configuration of the cleaning device 1 can be simplified.

  FIG. 4B shows an arrangement example when the first nozzle 20B and the second nozzle 30B inject compressed air to the downstream side in the transport direction E of the strip electrode A. The first nozzle 20B is disposed at a predetermined angle with respect to the upstream side (press roll R1 side) with respect to the belt-like electrode A being transported so that the jetting direction F1 of the compressed air is directed to the downstream side of the transport direction E. With this arrangement, the injection direction F1 of the first nozzle 20B is a direction from the upper side to the lower side and a direction from the upstream side to the downstream side in the transport direction E. Further, the second nozzle 30B is disposed at a predetermined angle to the upstream side (press roll R2 side) with respect to the belt-like electrode A being transported so that the compressed air injection direction F2 faces the downstream side in the transport direction E. The With this arrangement, the ejection direction F2 of the second nozzle 30B is the direction from the lower side to the upper side and the direction from the upstream side to the downstream side in the transport direction E. The predetermined angle for tilting may be appropriately set while adjusting the angle by an injection experiment or the like.

  In the case of the arrangement of the first nozzle 20B and the second nozzle 30B, the float D that is broken and removed from the cut end surface Aa can be reliably blown downstream in the transport direction E. Therefore, since the removed float D does not fly to the upstream press rolls R1 and R2, the float D (active material, etc.) is transferred to the surfaces of the active material layers B1 and B2 by the press rolls R1 and R2. Can be prevented.

  FIG. 4C shows an arrangement example when the first nozzle 20C and the second nozzle 30C inject compressed air to the outside in the width direction of the strip electrode A. The first nozzle 20 </ b> C is located on the center side in the width direction (the other first nozzle 20 </ b> C side) with respect to the belt-like electrode A being conveyed so that the jet direction F <b> 1 of the compressed air faces the outside in the width direction of the belt-like electrode A. Arranged at a predetermined angle. With this arrangement, the ejection direction F1 of the first nozzle 20C is the direction from the top to the bottom and the direction from the center side in the width direction to the outside. Further, the second nozzle 30C has a width direction center side (the other second nozzle 30C side) with respect to the belt-like electrode A being conveyed so that the jet direction F2 of the compressed air is directed to the outside in the width direction of the belt-like electrode A. ) At a predetermined angle. With this arrangement, the ejection direction F2 of the second nozzle 30C is the direction from the lower side to the upper side and the direction from the center side in the width direction to the outer side. The predetermined angle for tilting may be appropriately set while adjusting the angle by an injection experiment or the like.

  In the case of the arrangement of the first nozzle 20C and the second nozzle 30C, the float D that is broken and removed from the cut end surface Aa can be reliably blown to the outside (side) in the width direction of the strip electrode A. Therefore, the removed float D (active material or the like) can be prevented from adhering to the surfaces of the active material layers B1 and B2 of the strip electrode A.

  In addition to the above arrangement example, the first nozzle 20 and the second nozzle 30 may be arranged. For example, the first nozzle 20 may be disposed on the downstream side of the second nozzle 30 in the transport direction E. Thereby, since the compressed air in the injection direction F1 of the first nozzle 20 is blown to the float D later, the removed float D (active material or the like) is blown below the strip electrode A, and the active air on the upper side of the strip electrode A is blown. It can prevent adhering to the surface of the substance layer B1. In addition, the first nozzle 20 and the second nozzle so that the ejection direction F1 of the first nozzle 20 and the ejection direction F2 of the second nozzle 30 are directed to the downstream side in the transport direction E and to the outside in the width direction of the strip electrode A. 30 may be arranged. Thereby, the removed float D (active material or the like) can be blown away downstream in the transport direction E and outside in the width direction of the strip electrode A.

  As mentioned above, although embodiment of this invention was described, it is implemented in various forms, without being limited to the said embodiment.

  For example, in the above embodiment, the cleaning process (the first injection process and the second injection process) is performed after the pressing process is performed after the slit process, but the cleaning process is performed after the slit process without performing the pressing process. Also good. Even in this case, chips and the like may protrude from the cut end face after the end of the belt-like electrode is cut in the slitting process, so that these chips and the like can be removed in the cleaning process.

  In addition, when the orientation (for example, upward) of the float D generated on the cut end surface Aa is determined by the apparatus configuration in the slit process and the press process, the compressed air in the injection direction opposite to the orientation of the float D The ratio may be increased to be injected, or the compressed air in the opposite injection direction may be injected to be stronger than the compressed air in the other direction. Thereby, the float D can be broken more effectively.

  Further, the compressed air in the injection direction F1 and the compressed air in the injection direction F2 are alternately injected to the same portion of the cut end surface Aa, but the compressed air in the injection direction F1 from above is always injected last. Also good. Thereby, the removed float D is blown off below the strip electrode A, and the removed float D (active material or the like) can be prevented from adhering to the surface of the active material layer B1 above the strip electrode A.

  DESCRIPTION OF SYMBOLS 1 ... Cleaning apparatus, 2 ... 1st injection part, 3 ... 2nd injection part, 20, 20A, 20B, 20C ... 1st nozzle, 30, 30A, 30B, 30C ... 2nd nozzle, 20a, 21a, 30a, 31a ... Piping, 21,31 ... Valve, 22,32 ... Air tank, 23,33 ... Regulator, 24,34 ... Pressure gauge, 25,35 ... Filter, 26,36 ... Air supply source.

Claims (8)

An electrode manufacturing method comprising a cutting step of cutting an end portion of a band-shaped electrode in which an active material layer is formed on a band-shaped metal foil,
A first injection step of injecting gas from one surface side of the band-like electrode to the cut end surface of the band-like electrode whose end is cut in the cutting step during the conveyance of the band-like electrode;
A second injection step of injecting gas from the other surface side of the band-like electrode to the cut end surface of the band-like electrode whose end is cut in the cutting step during conveyance of the band-like electrode;
A method for producing an electrode, comprising:   The method for manufacturing an electrode according to claim 1, wherein the first injection step and the second injection step are performed alternately. Including a pressing step of pressing the active material layer of the strip electrode after the cutting step;
The method for manufacturing an electrode according to claim 1, wherein the first injection step and the second injection step are performed after the pressing step. An electrode cleaning device for cleaning the cut end face of the band-shaped electrode after the end of the band-shaped electrode in which the active material layer is formed on the band-shaped metal foil is cut,
A first injection port disposed on one surface side of the strip electrode, and a first injection unit that injects gas from the first injection port to the cut end surface of the strip electrode during conveyance of the strip electrode;
A second injection port disposed on the other surface side of the band electrode, and a second injection unit that injects gas from the second injection port to the cut end surface of the band electrode during conveyance of the band electrode;
An electrode cleaning apparatus comprising:   The electrode cleaning apparatus according to claim 4, wherein the first injection unit and the second injection unit alternately inject the gas at different injection timings.   6. The electrode cleaning device according to claim 4, wherein the first injection port and the second injection port are arranged at a predetermined interval in the transport direction of the belt-like electrode.   The electrode cleaning device according to any one of claims 4 to 6, wherein the first injection unit and the second injection unit inject the gas toward a downstream side in a transport direction of the strip electrode. .   The electrode cleaning device according to any one of claims 4 to 7, wherein the first injection unit and the second injection unit inject the gas toward an outer side in a width direction of the strip electrode.

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