JP2017050214A - Electrode manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress and prevent generation of creases by correcting warpage in the case where the warpage occurs by drying in a drying furnace.SOLUTION: An electrode manufacturing device comprises: an active material mixture coating part 13 for forming a coated part by coating one face of a belt-like metal foil 12 with an active material mixture S containing an active material and an organic solvent in such a manner that non-coated parts exist at both sides in a width direction of the metal foil 12; a drying furnace 14 for drying the active material mixture S coating the metal foil 12; a carrier roll 15 which is abutted to a face of the metal foil 12 at an opposite side of the face coated with the active material mixture S, for guiding the metal foil 12; and a pair of right and left touch rolls 16R and 16L which are abutted to the face of the metal foil 12 coated with the active material mixture S. At least one pair of touch rolls 16R and 16L is provided, without opposing the carrier roll 15, at a position where a residual organic solvent quantity in the active material mixture S coating the metal foil 12 is 10% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrode manufacturing apparatus, and more particularly, to an electrode manufacturing apparatus that manufactures a band-shaped electrode in which an active material mixture is applied to at least one surface of a band-shaped metal foil to form an active material layer.

  When manufacturing the strip electrode, after applying the active material mixture to at least one surface of the strip metal foil, the organic solvent in the active material mixture is removed by passing it through a drying furnace (drying apparatus). The strip electrode is guided by a plurality of transport rolls, passes through a drying furnace, and is then wound around a take-up reel. When the belt-like electrode is wound around the take-up reel in a state where the belt-like electrode is slack or warped, the belt-like electrode is wound up with wrinkles.

  As shown in FIG. 8, Patent Document 1 discloses that the coating liquid is applied to the substrate 52 in the conveyance path while the long band-shaped substrate 52 is unwound from the unwinding roll 51 and wound around the winding drive roll 53. There has been proposed a coating / drying device 56 having a coating part 54 to be coated and a drying part 55 for drying the coating liquid applied by the coating part 54. A plurality of guide rolls 57 for guiding the base material 52 and a pair of guide rolls 57 on the both sides in the axial direction on the guide roll 57 in order to prevent generation of wrinkles of the base material 52 due to the drying process in the drying unit 55 are provided in the conveyance path. And a presser roll 58 disposed in the same manner. The guide rolls 57 are arranged so as to transport the substrate 52 horizontally at least in the drying unit 55. The pressing roll 58 is disposed in the vicinity of the inlet side outside the drying unit 55 and in the vicinity of the inlet side inside the drying unit 55.

  As shown in FIGS. 9A and 9B, the pressing roll 58 is configured so that each rotation axis of the base material 52 is inclined with respect to the transport direction so that tension is applied to the base material 52 outward in the width direction. It intersects and is arranged in a divergent shape (plan view) toward the downstream side in the transport direction. The pressing roll 58 is provided so as to contact both the widthwise edge of the base material 52 and the peripheral surface of the guide roll 57.

JP 2007-98186 A

  Usually, in a drying furnace for drying long sheets (band-like sheets), a “meander prevention mechanism (guide roll) is provided on all or part of the transport roll (guide roll) to prevent the long sheet from meandering. The rotation center axis of the head rotates like swinging its head). When the pressing roll 58 is in contact with the guide roll and a load is applied as in Patent Document 1, a load is applied to the “meandering prevention mechanism” and the long sheet meanders.

  Moreover, when manufacturing a strip electrode, after applying an active material mixture to one side of the strip-shaped metal foil, the cause of warping when passing through a drying furnace is the organic solvent in the active material mixture The shrinkage that occurs when the active material is dried. Therefore, even if a pressing roll 58 is provided in the vicinity of the inlet of the drying unit 55 as in Patent Document 1, the effect of suppressing warping after drying is small.

  The present invention has been made in view of the above problems, and its purpose is to produce a strip electrode in which an active material layer is formed on at least one surface of a strip metal foil. An object of the present invention is to provide an electrode manufacturing apparatus capable of correcting and preventing wrinkles by correcting warpage when warping occurs due to drying.

  An electrode manufacturing apparatus that solves the above-described problem is that an active material mixture containing an active material and an organic solvent is applied to one surface of a strip-shaped metal foil, and the strip-shaped metal foil is coated on both sides in the width direction. An active material mixture application part that forms an application part so that there is a non-application part, a drying furnace that dries the active material mixture applied to the band-shaped metal foil, and the band-shaped metal foil A conveyance roll that guides the strip-shaped metal foil by contacting the surface opposite to the surface coated with the active material mixture, and a right and left that contacts the surface of the strip-shaped metal foil coated with the active material mixture In the electrode manufacturing apparatus including a pair of touch rolls, the touch roll has a residual organic solvent amount of 15 in the active material mixture applied to the strip-shaped metal foil without facing the transport roll. %, At least one set is provided.

  According to this configuration, the active material mixture application part applies the active material mixture containing the active material and the organic solvent to one surface of the belt-shaped metal foil, The application part is formed so that the non-application part exists on both sides in the width direction. The drying oven dries the active material mixture applied to the strip-shaped metal foil. A conveyance roll contacts the surface on the opposite side to the surface where the active material mixture of the strip-shaped metal foil was applied, and guides the strip-shaped metal foil. When a pair of left and right touch rolls is warped in a strip-shaped metal foil dried in a drying furnace, the pair of left and right touch rolls is opposite to the surface on which the active material mixture of the strip-shaped metal foil with the warp is applied. Since the belt-shaped metal foil moves in a state where the belt-shaped metal foil is in contact with the side surface and a force is applied to the belt-shaped metal foil in a direction for correcting the warpage, the warpage of the belt-shaped metal foil is corrected. And after a curvature is corrected with a touch roll, a strip | belt-shaped metal foil contacts a conveyance roll, and is guide | induced in the state by which generation | occurrence | production suppression of wrinkles was suppressed, and a strip | belt-shaped electrode is manufactured. The touch roll is not opposed to the transport roll and is provided at a position where the residual organic solvent amount in the active material mixture applied to the strip-shaped metal foil is 15% or less. Even when the active material mixture is pressed, the active material mixture is prevented from being transferred to the touch roll. Some transport rolls have a meandering prevention mechanism, but the touch roll does not press the transport roll, so that the touch roll does not hinder the function of the meandering prevention mechanism.

  In the projected view in the vertical direction with respect to the strip-shaped metal foil, the touch roll has an angle θa formed by a line extending to the transport direction side perpendicular to the front end in the transport direction of the strip-shaped metal foil and the transport direction is 0 °. The above is preferable. If the angle θa formed by the transport direction of the touch roll is larger than 0 °, the touch roll is rotated along with the movement of the strip-shaped metal foil, and thereby the force toward the metal foil in the width direction outside the metal foil. The force that corrects the warp acts on the metal foil. If the angle θa is too large, the vector (force) toward the outside in the width direction becomes large, which causes the metal foil to meander. Therefore, the angle θa is desirably 45 ° or less, and preferably 15 ° or less.

  In the virtual cross section extending in the width direction of the strip-shaped metal foil, the touch roll has an angle θb formed by the rotation axis of the touch roll and the surface without the warp of the strip-shaped metal foil is 0 ° or more. It is preferable. When the angle θb between the touch roll and the non-warped surface of the band-shaped metal foil is less than 0 °, the metal foil is warped in the opposite direction when correcting the warp with respect to the band-shaped metal foil. It is not desirable because a force to deform is applied. The magnitude of the angle θb varies depending on the thickness and width of the active material layer, but is preferably 0 ° or more and 10 ° or less, and more preferably 3 ° or more and 8 ° or less.

  The amount of residual organic solvent in the active material mixture applied to the strip-shaped metal foil is preferably 10% or less. If the amount of the residual organic solvent in the active material mixture is 15% or less, the active material mixture is hardly transferred (attached) to the touch roll even if the touch roll is pressed against the active material mixture on the metal foil. If it is 10% or less, transfer (adhesion) of the active material mixture is prevented.

  It is preferable that the touch roll is provided on the downstream side of the outlet of the drying furnace and on the upstream side of the transport roll disposed at a position closest to the outlet. As the metal foil moves from the entrance to the exit of the drying furnace, the amount of the residual organic solvent in the active material mixture decreases, and is 10% or less at the position where it leaves the drying furnace. Further, the higher the temperature, the easier it is to correct the warp, but the temperature is high at a position near the outlet even outside the drying furnace, and the warp is easy to correct. Further, when the metal foil comes into contact with the transport roll in a warped state, a tension is applied when the metal foil contacts the transport roll, so that the metal foil is pressed against the transport roll to generate “wrinkles”. However, when warpage occurs due to drying in the drying furnace, the metal foil comes into contact with the transport roll after the warpage is corrected by the touch roll, and thus generation of wrinkles can be prevented.

  A plurality of sets of the touch rolls are provided along the transport direction of the strip-shaped metal foil, and an angle θa formed by a line extending to the transport direction side perpendicular to the front end in the transport direction of the strip-shaped metal foil and the transport direction In addition, in a virtual cross section extending in the width direction of the strip-shaped metal foil, at least one of an angle θb formed by the rotation axis of the touch roll and a surface without the warp of the strip-shaped metal foil is downstream in the transport direction. It is preferable that it is provided so that it may become so small that the touch roll provided in is. When the magnitude of the warp to be corrected is the same, when correcting the warp of the metal foil with a set of touch rolls, a large force is applied to the metal foil at a time. On the other hand, when correcting the warp of the metal foil with a plurality of sets of touch rolls, the necessary force is applied so that the warp is reduced at least twice without applying a large force to the metal foil at once. Added. Therefore, it is possible to suppress generation of wrinkles and damage to the active material mixture as compared with the case where correction is performed by applying a large force at a time.

  According to the present invention, when manufacturing a strip electrode in which an active material layer is formed on at least one surface of a strip-shaped metal foil, if the warp is generated by drying in a drying furnace, the warp is corrected and wrinkles are corrected. Can be suppressed and prevented.

The side view which shows typically the electrode manufacturing apparatus of one Embodiment. The schematic plan view of the exit vicinity of the drying furnace which shows arrangement | positioning of a touch roll. The schematic plan view which shows the relationship between a touch roll and a strip | belt-shaped electrode. The schematic cross section which shows the relationship between a touch roll and a strip | belt-shaped electrode. The side view which shows typically the electrode manufacturing apparatus of another embodiment. (A), (b) is a partial side view which shows typically the electrode manufacturing apparatus of another embodiment. The schematic plan view which shows the relationship between the touch roll of another embodiment, and a strip | belt-shaped electrode. The side view which shows typically the coating and drying apparatus of a prior art. (A), (b) is a partial schematic plan view of a coating and drying apparatus.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electrode manufacturing apparatus 10 applies an active material mixture application unit 13 that applies an active material mixture S to a strip-shaped metal foil 12 that is fed from a supply reel 11, and applies to the strip-shaped metal foil 12. A drying furnace (drying device) 14 for drying the active material mixture S, a transport roll 15, a pair of left and right touch rolls 16L and 16R, and a take-up reel 17 are provided. A plurality of transport rolls 15 are provided along the transport path of the strip-shaped metal foil 12 (hereinafter sometimes simply referred to as the metal foil 12), and each transport roll 15 is an active material mixture S of the metal foil 12. The metal foil 12 is guided by coming into contact with the surface opposite to the surface on which is applied. The pair of left and right touch rolls 16L and 16R are provided so as to come into contact with the surface on which the active material mixture S of the metal foil 12 is applied.

  As shown in FIG. 1, the active material mixture application unit 13 includes a backup roll 18 and a die head 19 that applies the active material mixture S to the surface of the metal foil 12 that moves along the backup roll 18. Yes. The die head 19 includes a storage part 19a in which the active material mixture S is stored, and a discharge port 19b through which the active material mixture S stored in the storage part 19a is discharged. Dancer rolls 20 are respectively provided between the supply reel 11 and the backup roll 18 and between the transport roll 15 and the take-up reel 17 provided on the downstream side from the outlet of the drying furnace 14. The dancer roll 20 adjusts the tension of the moving metal foil 12 to prevent the metal foil 12 from loosening.

  As shown in FIG. 2, the active material mixture application part 13 is configured so that the active material mixture S containing the active material and the organic solvent is present on the both sides in the width direction of the metal foil 12, that is, the non-application part 21 exists. The active material mixture S is applied so that the non-application part 21 exists on both sides in the width direction of the application part 22.

  At least one pair of left and right touch rolls 16L and 16R is provided at a position where the amount of residual organic solvent in the active material mixture S applied to the metal foil 12 is 15% or less, preferably 10% or less. In this embodiment, the touch rolls 16L and 16R are near the outlet of the drying furnace 14, more specifically, on the downstream side of the outlet 14a of the drying furnace 14 and on the upstream side of the transport roll 15 disposed closest to the outlet 14a. Is provided.

  As shown in FIG. 3, the touch rolls 16 </ b> L and 16 </ b> R are projected from the front direction 16 a in the transport direction of the metal foil 12 and the boundary line between the application part 22 and the non-application part 21 in the projection view in the direction perpendicular to the metal foil 12. An angle θa formed by a line 23L extending perpendicularly to the front end 16a from the intersection point toward the transport direction and the transport direction is set to 0 ° or more. If the angle θa is larger than 0 °, the touch rolls 16L and 16R are rotated along with the movement of the strip-shaped metal foil 12, whereby a force toward the outer side in the width direction of the metal foil 12 acts on the metal foil 12. Thus, the force for correcting the warp acts on the metal foil 12. If the angle θa is too large, the vector (force) toward the outside in the width direction becomes large, causing the metal foil 12 to meander. Therefore, the angle θa is preferably 0 ° or more and 45 ° or less, and preferably 0 ° or more and 15 ° or less.

  As shown in FIG. 4, the touch roll 16 </ b> R includes a rotation axis center line 24 </ b> L of the touch roll 16 </ b> R and a plane 25 </ b> P parallel to the surface without the warp of the metal foil 12 in a virtual cross section extending in the width direction of the metal foil 12. The formed angle θb is set to 0 ° or more. Although not shown, the touch roll 16L has an angle θb formed between the rotation axis of the touch roll 16L and a plane parallel to the non-warped surface of the metal foil 12 in a virtual cross section extending in the width direction of the metal foil 12 in the same manner. It is provided at 0 ° or more. If the angle θb is less than 0 °, the touch rolls 16L and 16R are desirable because a force that deforms the metal foil 12 in a reverse direction acts after the warpage of the belt-shaped metal foil 12 is corrected. Absent. The magnitude of the angle θb varies depending on the thickness and width of the active material layer, but is preferably 0 ° or more and 10 ° or less, and more preferably 3 ° or more and 8 ° or less.

Next, the operation of the electrode manufacturing apparatus 10 configured as described above will be described.
As shown in FIG. 1, the metal foil 12 fed out from the supply reel 11 is sent to the active material mixture application unit 13 through the dancer roll 20, and the active material mixture application unit 13 applies the active material to the metal foil 12. Mixture S is applied. The metal foil 12 coated with the active material mixture S is sent to the drying furnace 14 via the transport roll 15 and moved in the drying furnace 14, and then the touch rolls 16L and 16R, the transport roll 15 and the dancer roll 20 are moved. After that, it is wound on the winding reel 17.

  As shown in FIGS. 2 and 3, the active material mixture S has the non-applied portion 21 on both sides in the width direction of the metal foil 12, that is, the non-applied portion 21 exists on both sides in the width direction of the applied portion 22. To be applied. The metal foil 12 coated with the active material mixture S moves through the drying roll 14 through the transport roll 15 to the outlet 14a, exits the drying furnace 14, and then comes into contact with the pair of touch rolls 16L and 16R. It passes through the touch rolls 16 </ b> L and 16 </ b> R in a pressed state, and is taken up on the take-up reel 17 through the transport roll 15 and the dancer roll 20.

  The active material mixture S applied to the metal foil 12 is dried while the metal foil 12 passes through the drying furnace 14, and in the active material mixture S applied to the metal foil 12 in a state of coming out of the drying furnace 14. The amount of residual organic solvent is 10% or less. In this state, even if the touch rolls 16L and 16R come into contact with the active material mixture S on the metal foil 12, the active material mixture S is not transferred to the touch rolls 16L and 16R.

  As shown in FIGS. 3 and 4, the touch rolls 16 </ b> L and 16 </ b> R are in contact with the non-application part 21 and the application part 22 in a state of straddling the boundary between the non-application part 21 and the application part 22 with respect to the metal foil 12. . When the organic solvent in the active material mixture S is removed when passing through the drying furnace 14, the metal foil 12 is coated with the active material mixture S as shown in FIG. 4 (upper side in FIG. 4). ) Goes out of the drying furnace 14 in a warped state. Then, the warped portion moves in a state of being in contact with the touch rolls 16L and 16R, so that the warp is suppressed and prevented, and the transport roll 15 disposed at the position closest to the outlet 14a of the drying furnace 14 In the abutted state, it is wound up on the winding reel 17 through the dancer roll 20 to form a strip electrode 26.

  When the amount of residual organic solvent in the active material mixture S applied to the metal foil 12 is large, when the touch rolls 16L and 16R come into contact with the active material mixture S on the metal foil 12 that has left the drying furnace 14, the active material A part of the mixture S is transferred (attached) to the touch rolls 16L and 16R. The organic solvent is not uniformly dispersed in the active material mixture S but is contained in a state where the amount of the active material mixture S on the surface side is increased. When the amount of residual organic solvent in the active material mixture S applied to the metal foil 12 is 10% or less, the active material mixture S is prevented from being transferred to the touch rolls 16L and 16R. In this embodiment, since the amount of residual organic solvent in the active material mixture S applied to the metal foil 12 is 10% or less at the position where the touch rolls 16L and 16R are provided, the active material mixture S Is prevented from being transferred (attached) to the touch rolls 16L, 16R.

  For the strip-shaped metal foil 12 coated with the active material mixture S, warping does not occur uniformly, and the amount of warping is not only in the longitudinal direction of the metal foil 12, but also in the width direction. It occurs irregularly and randomly like “rippling”. When the metal foil 12 comes into contact with the transport roll 15 in a warped state, tension is applied when the metal foil 12 contacts the transport roll 15 (even if the meandering correction device is attached). “Wrinkles” occur when pressed.

  Further, when the warp is strong, only the central portion in the width direction comes into contact with the transport roll 15, and the tension acts only on that portion, so that the “tension” of the metal foil 12 becomes uneven and “wrinkles” occur. At this time, “wrinkles” occur particularly near the boundary between the application part 22 and the non-application part 21.

  However, in this embodiment, when warpage occurs due to drying in the drying furnace 14, the metal foil 12 comes into contact with the transport roll 15 after the warpage is corrected by the touch rolls 16 </ b> L and 16 </ b> R, thereby preventing generation of wrinkles. be able to.

According to this embodiment, the following effects can be obtained.
(1) In the electrode manufacturing apparatus, the active material mixture S containing the active material and the organic solvent is present on one side of the strip-shaped metal foil 12 with the non-application portions 21 on both sides in the width direction of the metal foil 12. The active material mixture application unit 13 that forms the application unit 22, the drying furnace 14 that dries the active material mixture S applied to the metal foil 12, and the active material mixture of the metal foil 12. A transport roll 15 that contacts the surface opposite to the surface coated with S to guide the metal foil 12, and a pair of left and right touch rolls 16L that contact the surface coated with the active material mixture S of the metal foil 12; 16R. At least one set of the touch rolls 16L and 16R is provided at a position where the residual organic solvent amount in the active material mixture S applied to the metal foil 12 is 10% or less without facing the transport roll 15.

  When the pair of left and right touch rolls 16L and 16R is warped in the strip-shaped metal foil 12 dried in the drying furnace 14, the pair of left and right touch rolls 16L and 16R is the active material of the strip-shaped metal foil 12 in which the warp is generated. Since the belt-shaped metal foil moves in contact with the surface opposite to the surface on which the mixture S is applied and a force in the direction of correcting the warp is applied to the belt-shaped metal foil, the belt-shaped metal foil moves. The warp of the metal foil is corrected. The touch rolls 16L and 16R do not face the transport roll 15 and are provided at positions where the residual organic solvent amount in the active material mixture S applied to the strip-shaped metal foil 12 is 10% or less. Even when the rolls 16L and 16R are pressed against the active material mixture S, the active material mixture S is prevented from being transferred to the touch roll. If the amount of residual organic solvent in the active material mixture S is 15% or less, the active material mixture is applied to the touch rolls 16L and 16R even if the touch rolls 16L and 16R are pressed against the active material mixture S on the metal foil 12. S is difficult to transfer (attach), but if it is 10% or less, transfer (attachment) of the active material mixture S is prevented. Although the transport roll 15 includes a meandering prevention mechanism, the touch rolls 16L and 16R do not press the transport roll 15, so that the touch roll does not hinder the function of the meander prevention mechanism.

  (2) The touch rolls 16L and 16R are, in a projection view in the vertical direction with respect to the strip-shaped metal foil 12, an angle formed by a line 23L extending to the transport direction side perpendicular to the front end 16a in the transport direction of the metal foil 12 and the transport direction. θa is 0 ° or more. If the angle θa formed with the conveyance direction of the touch rolls 16L and 16R is greater than 0 °, the touch rolls 16L and 16R are rotated along with the movement of the strip-shaped metal foil 12, thereby causing the metal foil to move relative to the metal foil 12. The force toward the outer side in the width direction of 12 acts, and the force for correcting the warp acts on the metal foil 12. If the angle θa is too large, the vector (force) toward the outside in the width direction becomes large, causing the metal foil 12 to meander. Therefore, the angle θa is desirably 45 ° or less, and preferably 15 ° or less.

  (3) The touch rolls 16L and 16R are formed by rotation axes 24L of the touch rolls 16L and 16R and surfaces without warpage of the strip-shaped metal foil 12 in a virtual cross section extending in the width direction of the strip-shaped metal foil 12. The angle θb is 0 ° or more. When the angle θb between the touch rolls 16L and 16R and the surface without the warp of the strip-shaped metal foil 12 is less than 0 °, the metal foil 12 is reversed when correcting the warp with respect to the strip-shaped metal foil 12. This is not desirable because a force that deforms in a direction that warps in the direction acts. The magnitude of the angle θb varies depending on the thickness and width of the active material layer (active material mixture S), but is preferably 0 ° or more and 10 ° or less, and more preferably 3 ° or more and 8 ° or less.

  (4) The touch rolls 16L and 16R are provided downstream from the outlet 14a of the drying furnace 14 and upstream from the transport roll 15 disposed at a position closest to the outlet 14a. As the metal foil 12 moves from the inlet of the drying furnace 14 toward the outlet 14a, the amount of the residual organic solvent in the active material mixture S decreases and becomes 10% or less at the position leaving the drying furnace 14. Yes. Further, the higher the temperature, the easier it is to correct the warp, but even outside the drying furnace 14, the temperature is high near the outlet 14a, and the warp is easy to correct. When the metal foil 12 comes into contact with the transport roll 15 in a warped state, tension is applied when the metal foil 12 comes into contact with the transport roll 15, so that the metal foil 12 is pressed against the transport roll 15 to generate “wrinkles”. However, when warpage occurs due to drying in the drying furnace 14, the metal foil 12 comes into contact with the transport roll 15 after the warpage is corrected by the touch rolls 16 </ b> L and 16 </ b> R, and thus generation of wrinkles can be prevented.

The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 5, the touch rolls 16 </ b> L and 16 </ b> R may be provided on the outlet 14 a side in the drying furnace 14. The drying furnace 14 is not hermetically sealed, the inlet and outlet 14a are open, and the amount of the residual organic solvent in the active material mixture S on the metal foil 12 fed from the inlet into the drying furnace 14 is the metal foil 12 Decreases as it moves through the drying furnace 14, and is 15% or less in the state of approaching the outlet 14a (outlet side) depending on the drying conditions. Therefore, even if the touch rolls 16L and 16R are provided on the outlet 14a side in the drying furnace 14, the metal foil is in a state straddling the non-application part 21 and the application part 22 of the metal foil 12 that has warped due to drying in the drying furnace 14. By pressing 12, the touch rolls 16 </ b> L and 16 </ b> R can prevent the active material mixture S from being transferred (attached), and can correct the warpage and suppress the generation of wrinkles.

  ○ As shown in FIGS. 6A and 6B, the pair of left and right touch rolls 16L and 16R that abut on the surface of the metal foil 12 on which the active material mixture S is applied is not limited to a single set (see FIG. 6). 6 (a) and 2 (b) may be provided). When a plurality of sets of touch rolls 16L and 16R are provided, an angle θb formed by the touch rolls 16L and 16R provided on the downstream side in the transport direction of the metal foil 12 is greater than an angle θb formed by the touch rolls 16L and 16R provided on the upstream side. It is preferable to provide a smaller size. When the warp to be corrected is the same, when the warp of the metal foil 12 is corrected by the pair of touch rolls 16L and 16R, a large force is applied to the metal foil 12 at a time. On the other hand, when correcting the warp of the metal foil 12 with a plurality of sets of touch rolls 16L, 16R, a large force is not applied to the metal foil 12 at once, and the warp is reduced at least twice. The necessary power is applied. Therefore, the generation of wrinkles and damage to the active material mixture S can be suppressed as compared with the case where correction is performed by applying a large force at a time.

  ○ When a plurality of pairs of left and right touch rolls 16L and 16R are provided, as shown in FIG. 6B, the touch rolls 16L and 16R are provided both inside and outside the drying furnace 14, or in FIG. As shown, it may be provided only outside the drying furnace 14. A plurality of sets of touch rolls 16L and 16R may be provided only in the drying furnace 14, but in that case, in the active material mixture S when contacting the touch rolls 16L and 16R that first contact the metal foil 12. The drying conditions for reducing the residual organic solvent amount to 15% or less become difficult.

  (Circle) the electrode manufacturing apparatus 10 is good also as a structure which manufactures multiple strip | belt-shaped electrode 26 from the strip | belt-shaped metal foil 12 of 1 sheet | seat, for example. In that case, the die head 19 constituting the active material mixture application unit 13 includes two discharge ports 19b. Then, as shown in FIG. 7, the active material mixture S is applied so that there are two coated portions 22 and three uncoated portions 21 on the metal foil 12. The touch rolls 16 </ b> L and 16 </ b> R are respectively provided at the boundary between each application unit 22 and the non-application unit 21. The width of one non-application part 21 sandwiched between two application parts 22 is larger than the width of the non-application part 21 formed at both ends of the metal foil 12 so that adjacent touch rolls 16L and 16R do not interfere with each other. Largely formed.

  The touch rolls 16L and 16R are provided so that at least one of the angle θa and the angle θb can be changed, and the angle θa and the angle θb are changed to a state suitable for correcting the warp according to the warp state of the metal foil 12. You may do it. Specifically, a warp detection device is provided on the upstream side in the movement direction of the metal foil 12 from the installation location of the touch rolls 16L and 16R to detect the warp size, and the touch rolls 16L and 16R are detected according to the warp size. The angle θa and the angle θb are changed. According to this structure, even if the magnitude | size of the curvature which generate | occur | produces when it dries with the drying furnace 14 changes, the touch rolls 16L and 16R always press the metal foil 12 in an appropriate state in order to correct curvature. it can.

  When manufacturing the strip | belt-shaped electrode 26 of several strips from the strip | belt-shaped metal foil 12, the arrangement | positioning position of the touch rolls 16L and 16R provided so that it may contact | abut with the adjacent application part 22 is metal foil 12 You may provide in the state which shifted | deviated in the moving direction. According to this structure, the width | variety of the non-application | coating part 21 pinched | interposed into the adjacent application | coating part 22 formed on one strip | belt-shaped metal foil 12 is made into the width | variety of one strip | belt-shaped metal foil 12 like FIG. The touch roll 16L and the touch roll 16R provided so as to come into contact with the same non-application part 21 are provided without interference even if they are formed to be the same without being formed wider than the width of the non-application part 21 formed at both ends. .

  ○ Instead of providing a pair of left and right touch rolls 16L and 16R so as to straddle the coating part 22 and the non-coating part 21 on the metal foil 12 warped by drying in the drying furnace 14, a pair of left and right fixed pressing parts May be provided. The pressing part is not required to damage the active material mixture S or the metal foil 12. Specifically, the pressing part is applied with a surface coat with a reduced friction coefficient, such as a polytetrafluoroethylene coat or diamond-like carbon. The surface is made of a hard material made of metal or resin having a curved surface.

  When manufacturing the strip electrode 26 in which the active material mixture S is applied on both sides of the strip-shaped metal foil 12, the strip-shaped metal foil 12 in which the active material mixture S is applied and dried is wound on one surface. By using the reel as the supply reel 11, the belt-like electrode 26 in which the active material mixture S is applied on both sides is manufactured.

  The active material mixture application unit 13 is not limited to the configuration including the die head 19, and includes, for example, a slurry storage unit and a gravure roll to which the slurry-like active material mixture stored in the slurry storage unit is attached. The structure provided with the supply part which supplies the slurry which the slurry was stored, the coating roll, the coating roll, and the coating roll, and the comma roll may be sufficient.

  The active material mixture application unit 13 is not limited to the configuration in which the active material mixture S is continuously applied on the metal foil 12, but the size (length) or winding of the electrode for the laminated electrode assembly The structure which apply | coats the application part 22 of the length corresponding to the magnitude | size (length) of the electrode for type | mold electrode assemblies intermittently may be sufficient.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 6, the touch roll is provided so that at least one of the angle θa and the angle θb can be changed, and the state of warping of the metal foil Accordingly, the angle θa and the angle θb are changed to a state suitable for correcting the warp.

  S ... Active material mixture, θa ... Angle, θb ... Angle, 10 ... Electrode manufacturing apparatus, 12 ... Metal foil, 13 ... Active material mixture application part, 14 ... Drying furnace, 14a ... Outlet, 15 ... Transport roll, 16a ... front end, 16L, 16R ... touch roll, 21 ... non-application part, 22 ... application part, 23L ... line, 24L ... rotation axis, 25P ... surface.

Claims (6)

An active material mixture containing an active material and an organic solvent is applied to one surface of the strip-shaped metal foil, and the strip-shaped metal foil is coated such that there are non-coated portions on both sides in the width direction. Active material mixture application part to form a part,
A drying furnace for drying the active material mixture applied to the band-shaped metal foil;
A transport roll for guiding the belt-shaped metal foil in contact with the surface opposite to the surface of the strip-shaped metal foil to which the active material mixture is applied;
A pair of left and right touch rolls in contact with the surface of the strip-shaped metal foil applied with the active material mixture;
In an electrode manufacturing apparatus comprising:
At least one set of the touch rolls is provided at a position where the amount of the residual organic solvent in the active material mixture applied to the strip-shaped metal foil is 15% or less without facing the transport roll. An electrode manufacturing apparatus.   In the projected view in the vertical direction with respect to the strip-shaped metal foil, the touch roll has an angle θa formed by a line extending to the transport direction side perpendicular to the front end in the transport direction of the strip-shaped metal foil and the transport direction is 0 °. It is the above, The electrode manufacturing apparatus of Claim 1.   In the virtual cross section extending in the width direction of the strip-shaped metal foil, the touch roll has an angle θb formed by the rotation axis of the touch roll and the surface without the warp of the strip-shaped metal foil is 0 ° or more. The electrode manufacturing apparatus according to claim 2.   The electrode manufacturing apparatus according to any one of claims 1 to 3, wherein a residual organic solvent amount in the active material mixture applied to the strip-shaped metal foil is 10% or less.   The said touch roll is provided in the downstream from the exit of the said drying furnace, and the upstream from the said conveyance roll arrange | positioned in the position nearest to the said exit, The Claim 1 characterized by the above-mentioned. Electrode manufacturing equipment.   A plurality of sets of the touch rolls are provided along the transport direction of the strip-shaped metal foil, and an angle θa formed by a line extending to the transport direction side perpendicular to the front end in the transport direction of the strip-shaped metal foil and the transport direction In addition, in a virtual cross section extending in the width direction of the strip-shaped metal foil, at least one of an angle θb formed by the rotation axis of the touch roll and a surface without the warp of the strip-shaped metal foil is downstream in the transport direction. The electrode manufacturing apparatus as described in any one of Claims 1-5 provided so that the touch roll provided in can be reduced.

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