JP5947747B2 - Tension control device - Google Patents

Description

  The present invention relates to a tension control device that changes tension applied to a battery substrate during continuous conveyance before and after passage in a production line that continuously conveys the battery substrate.

  Conventionally, for example, Patent Document 1 discloses a battery manufacturing apparatus in which an electrode mixture is applied to a sheet-like current collector that is continuously conveyed to form a secondary battery. A feeding roll that feeds out the current body; a backup roll that feeds the current collector that is fed out from the feeding roll; and the current collector that is arranged to face the backup roll by rotating operation; And a die coater for applying an electrode mixture to the body. And between the said backup roll and the said delivery roll, a pair of feed rolls which pinch | interpose the said collector during the said continuous conveyance and let it pass between by rotation operation are provided, and before and after passing between these feed rolls The tension applied to the current collector is changed.

  By the way, using the manufacturing apparatus as disclosed in Patent Document 1, the battery base material in which the active material layer is attached to the current collector is continuously conveyed, and the active material layer is coated with a flame retardant to form the active material layer. In some cases, a protective layer for covering the film is formed. In order to increase the capacity of the secondary battery, the battery substrate for continuous conveyance has recently been compressed with a pair of press rolls together with the current collector before the active material layer is coated with the flame retardant. It is common to increase the density.

JP 2012-33426 A (columns 0010 to 0031, FIG. 2)

  However, when the active material layer is compressed together with the current collector with a pair of press rolls, the current collector and the active material layer are curved into a wave shape because the current collector is a metal plate. Therefore, when the current collector and the active material layer pass between the two feed rolls as described above, the curved portions of the current collector and the active material layer are crushed and bent by the two feed rolls, and permanent wrinkles are generated. There is a risk of becoming.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a battery substrate in a production line that continuously conveys a battery substrate without generating permanent wrinkles on the battery substrate. An object of the present invention is to provide a tension control device capable of adjusting a tension applied to a material.

  In order to achieve the above object, the present invention is characterized in that the shape of the outer peripheral surface of the feed roll has been devised.

  Specifically, in a production line for continuously conveying a battery substrate provided with an active material layer on at least one surface of a sheet-like current collector, a pair of sandwiching the battery substrate during continuous conveyance from both sides A feed roll, and a drive unit that rotationally drives one of the two feed rolls, and by changing the peripheral speed of one of the two feed rolls with respect to the conveyance speed of the battery substrate by the drive unit, The following solution was taken for a tension control device that changes the tension applied to the battery substrate before and after passing between the two feed rolls.

  That is, the present invention is characterized in that a plurality of concave grooves extending in the roll circumferential direction are provided on the other outer circumferential surface of the both feed rolls at a predetermined interval in the roll rotation axis direction.

  In the first invention, when the battery substrate is sandwiched between the pair of feed rolls, a space is formed between the outer peripheral surface of one feed roll and the groove groove of the other feed roll. The curved portion of the battery substrate that has been sandwiched and has nowhere to go escapes into the space. Therefore, it is possible to adjust the tension of the battery substrate during continuous conveyance with the pair of feed rolls while preventing the curved portion of the battery substrate from being bent between the two feed rolls and becoming permanent wrinkles.

It is a layout diagram of a production line provided with a tension control device according to an embodiment of the present invention. It is sectional drawing in the AA of FIG. It is sectional drawing in the BB line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows a production line 1 according to an embodiment of the present invention. The production line 1 is configured such that a flame retardant is applied to both surfaces of a sheet-like battery substrate 10 that is continuously conveyed to form a protective layer 10c of 2 to 5 μm. From the side, a base material feeding step 2 for feeding out the battery base material 10; a first tension changing step 3 for changing the tension of the battery base material 10 fed out from the base material feeding step 2 before and after passing; A coating process 4 for coating the battery substrate 10, a meandering suppression process 5 for suppressing meandering conveyance of the battery substrate 10, and a drying process 6 for drying the coated battery substrate 10. A second tension changing step 7 for changing the tension of the battery substrate 10 that has passed through the drying step 6 before and after passing, and a substrate winding for winding up the battery substrate 10 on which the protective layer 10c is formed. Are taken in order, and the battery substrate 10 includes a plurality of gaskets. Dror 11 wound around it is continuously conveyed.

  As shown in FIGS. 2 and 3, the battery base material 10 is continuously attached in the base material conveyance direction on both sides of the current collector 10 a and a current collector 10 a made of copper foil having a thickness of about 10 to 20 μm. The formed active material layer 10b has a thickness of about 50 to 100 μm.

  The battery substrate 10 is compressed by being sandwiched and compressed between a pair of press rolls (not shown) in order to increase the density of the active material layer 10b. It is continuous in the substrate transport direction. 2 and 3, the thicknesses of the current collector 10a, the active material layer 10b, and the protective layer 10c are exaggerated for convenience.

  In the substrate feeding process 2, as shown in FIG. 1, a substantially triangular support frame 2a in a front view and a support frame 2a are rotatably supported by the support frame 2a, and the battery substrate 10 is wound in a roll shape. The driven-out roll 2b is disposed.

  In the coating process 4, two coating units 4 a that face each surface of the battery base material 10 are arranged, and the coating units 4 a are difficult to connect to each surface of the battery base material 10. The flame retardant is applied.

  In the meandering suppression process 5, a pair of sandwiching rollers 5 a that sandwich the uncoated area 10 d from above and below are provided for each uncoated area 10 d, and are conveyed to the drying process 6 by the sandwiching rollers 5 a. The meandering (flapping) of the battery substrate 10 is suppressed.

  In the drying step 6, a floating dryer 6 a that dries the battery substrate 10 that has been transported in a substantially horizontal direction that has passed through the meandering suppression step 5 is disposed, and the floating dryer 6 a faces the battery substrate 10. And a plurality of nozzles 6b for discharging air.

  The nozzles 6b are spaced in the base material transport direction on both the upper and lower sides of the battery base material 10 transported in a substantially horizontal direction, and alternately staggered in the base material transport direction on both sides of the battery base material 10 They are offset.

  The floating dryer 6a floats the battery substrate 10 by discharging air from the nozzles 6b toward both surfaces of the battery substrate 10 in the process of transporting the battery substrate 10. The flame retardant is dried by being conveyed while meandering in a state.

  The base material winding step 8 includes a substantially triangular support frame 8a in a front view, and a winding roll that is rotatably supported by the support frame 8a and the battery base material 10 is wound into a roll shape. 8b are arranged.

  A tension control device 9 is disposed in each of the first and second tension changing steps 3 and 7.

  The tension control device 9 includes a pair of feed rolls 9a and 9b for sandwiching the battery substrate 10 being continuously conveyed from both upper and lower sides, and the battery substrate 10 is wound around a feed roll 9a positioned on the upper side. ing.

  As shown in FIG. 3, the feed roll 9a has a cylindrical shape made of steel.

  On the other hand, the feed roll 9b includes a cylindrical roll body 91 made of carbon fiber reinforced plastic, and a skin layer 92 made of a rubber material is formed on the outer periphery of the roll body 91.

  The skin layer 92 is provided with a plurality of concave grooves 92a extending in the roll circumferential direction at predetermined intervals in the roll rotation axis direction.

  As shown in FIG. 1, a driving device (driving means) 9c for rotating the feed roll 9a by servo motor control is connected to the feed roll 9a, and the driving device 9c allows the peripheral speed of the feed roll 9a to be increased. The tension applied to the battery substrate 10 before and after passing between the two feed rolls 9a and 9b is changed by changing the conveyance speed of the battery substrate 10.

  As described above, according to the embodiment of the present invention, when the battery substrate 10 is sandwiched between the pair of feed rolls 9a and 9b, the outer peripheral surface of the feed roll 9a located on the upper side and the concave line of the feed roll 9b located on the lower side. Since a space is formed between the groove 92a, the curved portion W (see FIG. 3) of the battery substrate 10 sandwiched between the feed rolls 9a and 9b and having no place to escape escapes into the space. Accordingly, the tension of the battery substrate 10 being continuously conveyed by the pair of feed rolls 9a and 9b is prevented while preventing the curved portion W of the battery substrate 10 from being bent between the feed rolls 9a and 9b and becoming permanent wrinkles. Can be adjusted.

  In the embodiment of the present invention, the skin layer 92 is formed of a rubber material. However, the present invention is not limited to this, and it may be formed of a metal material or a resin material.

  Moreover, in embodiment of this invention, although the roll main body 91 is formed with carbon fiber reinforced plastics, you may form not only this but with a metal material and a rubber material.

  Moreover, in embodiment of this invention, although the feed roll 9a is formed with the metal material, you may form not only this but with a resin material or a rubber material.

  In the embodiment of the present invention, the feed roll 9a is rotationally driven by the driving device 9c. However, the feed roll 9b is driven by the driving device 9c, and a plurality of concave grooves 92a are formed on the outer peripheral surface of the feed roll 9a. You may make it form.

  Further, in the embodiment of the present invention, the tension control device 9 is applied in the production line 1 that transports the battery base material 10 to which the active material layer 10b is continuously attached in the base material transport direction of the current collector 10a. However, the tension control device 9 is also applied to a production line that transports the battery substrate 10 on which the active material layer 10b is attached with a certain interval in the substrate transport direction of the current collector 10a. be able to.

  In the embodiment of the present invention, the tension control device 9 is applied in the production line 1 in which the battery base material 10 having the active material layer 10b attached to both surfaces of the current collector 10a is continuously conveyed. The tension control device 9 can also be applied to a production line in which the battery substrate 10 having the active material layer 10b attached to at least one surface of the current collector 10a is continuously conveyed.

  In the embodiment of the present invention, the tension control device 9 is applied to the production line 1 for applying a flame retardant to the sheet-shaped battery substrate 10. However, the present invention is not limited thereto, and the sheet-shaped battery substrate is not limited thereto. If it is a production line which conveys 10, the said tension control apparatus 9 is applicable.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a tension control device that changes the tension applied to a battery substrate during continuous conveyance before and after passage in a production line that continuously conveys the battery substrate.

DESCRIPTION OF SYMBOLS 1 Production line 9 Tension control apparatus 9a, 9b Feed roll 9c Drive apparatus (drive means)
DESCRIPTION OF SYMBOLS 10 Battery base material 10a Current collector 10b Active material layer 92a Concave groove

Claims (1)

In a production line for continuously conveying a battery substrate provided with an active material layer on at least one surface of a sheet-like current collector, a pair of feed rolls sandwiching the battery substrate being continuously conveyed from both sides, Drive means for rotationally driving one of the two feed rolls, and by changing the peripheral speed of one of the two feed rolls with respect to the conveying speed of the battery substrate by the drive means, A tension control device that changes the tension applied to the battery substrate before and after passing through
A tension control device, wherein a plurality of concave grooves extending in the circumferential direction of the roll are provided on the other outer circumferential surface of the two feed rolls at predetermined intervals in the roll rotation axis direction.

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