JP6065702B2 - Electrode manufacturing apparatus and electrode manufacturing method - Google Patents

Description

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

  Conventionally, lithium ion secondary batteries, nickel-hydrogen secondary batteries, and the like are well known as power storage devices mounted on vehicles such as EVs (Electric Vehicles) and PHVs (Plug-in Hybrid Vehicles). These power storage devices have an electrode assembly formed by winding a strip-shaped electrode having an active material layer on the surface of a strip-shaped metal foil or by laminating an electrode sheet obtained by punching the strip-shaped electrode There is.

  As an apparatus for producing such a strip-shaped electrode, an active material layer containing an active material is discharged from a coating die to form an active material layer continuously or intermittently on the surface of the strip-shaped metal foil. What is known is known (for example, Patent Document 1).

International Publication No. 2010/122601

  By the way, in the case of a strip-shaped electrode, warping in the longitudinal direction may occur due to being stored for a long period of time while being wound in a roll shape or being heated (baked). When the electrode having such a warp is wound or punched and laminated, the edge of the electrode assembly is displaced, and the performance as a power storage device may be deteriorated.

  This invention was made paying attention to the problem which exists in the said prior art, The objective is to provide the manufacturing method of an electrode which can correct an electrode, and can reduce curvature, and the manufacturing method of an electrode. is there.

An electrode manufacturing apparatus that solves the above-described problem is an electrode manufacturing apparatus that includes a correction unit that corrects warping of a strip-shaped electrode having an active material layer, and the correction unit includes a heating furnace and an inside of the heating furnace. A plurality of first rolls that are disposed in the first electrode and that are in contact with a first contact surface, which is one surface of the electrode, to be warped in a direction opposite to the warpage in the longitudinal direction of the electrode, and in the heating furnace. A plurality of second rolls that are in contact with a second abutment surface opposite to the first abutment surface, and the electrodes are alternately provided on the first roll and the second roll. The first roll, which is in contact with the first roll, has an upstream first roll located on the upstream side in the transport direction of the electrode, and a downstream first roll located on the downstream side in the transport direction, and the upstream side The rotational speed of the first roll is slightly slower than the rotational speed of the downstream first roll. It is constant, further comprising a cooling unit for cooling the electrodes to correct the warp by straightening unit, between and the cooling portion of the correction unit and the cooling unit, and summarized in that the shape of the electrode is not changed .

  According to this configuration, the first roll that corrects the electrode by warping in the direction opposite to the warpage in the longitudinal direction of the electrode while releasing the residual stress of the active material layer by heating the electrode in the heating furnace, The electrode can be alternately contacted a plurality of times with the second roll that is in contact with the second contact surface opposite to the first contact surface that is in contact with one roll. For this reason, a curvature can be reduced by correcting an electrode.

  Moreover, about the manufacturing apparatus of the said electrode, it is preferable that the said electrode contacts in the range of 180 degrees or more and 270 degrees or less along the circumferential direction of the said 1st roll. According to this configuration, by securing a range where the electrode and the first roll come into contact with each other, the electrode can be corrected by the first roll, and warpage can be further reduced.

Further, the apparatus for manufacturing the electrode preferably further comprises a forming unit to change the shape of the cooled electrode in the previous SL cooling unit.

According to this configuration, it is possible to prevent the electrode from newly warping as the electrode is formed by cooling and shaping the electrode whose warp has been corrected by the correcting portion. Here, “forming the electrode” is intended to change the shape of the electrode, for example, by winding the electrode into a roll or punching it into a predetermined shape .

Moreover, the manufacturing method of the electrode which solves the said subject is a manufacturing method of an electrode including the correction process which corrects the curvature of the strip | belt-shaped electrode which has an active material layer, Comprising: In the said correction process, it is 1st in a heating furnace. In the heating furnace, a plurality of first correction steps for correcting the roll in a direction opposite to the warpage in the longitudinal direction of the electrode by bringing the roll into contact with the first contact surface, which is one surface of the electrode, in the heating furnace A plurality of second correction steps for bringing the second roll into contact with a second contact surface that is a surface opposite to the first contact surface, and the correction step includes the first correction step and The second straightening step is alternately performed, and in the straightening step, the rotation speed of the upstream first roll located on the upstream side in the transport direction of the electrode of the first roll is the transport direction of the first roll. From the rotation speed of the downstream first roll located on the downstream side of Is set slightly slower, further comprising a cooling step of cooling the electrodes to correct the warp by straightening step, between and cooling step and the cooling step and the correction step, the shape of the electrode is not changed Is the gist.

  According to this configuration, the first correction is performed by heating the electrode in the heating furnace so that the residual stress of the active material layer is released, and the first material is brought into contact with the first roll and warped in the direction opposite to the electrode warpage. A process and the 2nd correction process of making a 2nd roll contact | abut to the 2nd contact surface on the opposite side to the 1st contact surface contact | abutted with a 1st roll among electrodes are performed by multiple times alternately. For this reason, a curvature can be reduced by correcting an electrode.

Moreover, it is preferable that the manufacturing method of the said electrode further includes the shaping | molding process which changes the shape of the electrode cooled in the said cooling process. According to this configuration, when the electrode is molded, it is possible to prevent the electrode from newly warping .

  According to the present invention, it is possible to reduce warpage by correcting the electrode.

The front view which shows the manufacturing apparatus of an electrode typically. The front view which shows typically the manufacturing apparatus of the electrode in other embodiment.

Hereinafter, an embodiment of an electrode manufacturing apparatus will be described.
As shown in FIG. 1, the manufacturing apparatus 10 of the present embodiment includes a supply mechanism 12 as a supply unit that supplies a strip-shaped electrode 11 used in a lithium ion secondary battery as a power storage device. The supply mechanism 12 includes, for example, a supply roll 12a that sets an electrode roll 11a wound around a core material in a roll shape and supplies the electrode 11 to the apparatus.

  Here, the electrode 11 has an active material layer 13b including an active material, a conductive agent, and a binder on both surfaces of the strip-shaped metal foil 13a. In the positive electrode 11, the strip-shaped metal foil 13 a is, for example, an aluminum foil, and an active material for the positive electrode is used as the active material.

  Moreover, in the electrode 11 for negative electrodes, the strip | belt-shaped metal foil 13a is copper foil, for example, and the active material for negative electrodes is used as an active material. The binder used for the active material layer 13b is, for example, polyvinylidene fluoride having a thermal decomposition temperature of 375 ° C., polytetrafluoroethylene having a thermal decomposition temperature of 390 ° C., or the like.

  In addition, the electrode 11 is stored in a state of the electrode roll 11a for a predetermined period or is subjected to a heating (baking) process so that the electrode 11 is bent along the circumferential direction of the electrode roll 11a. Are warped in the longitudinal direction.

  In the manufacturing apparatus 10, the electrode 11 is drawn from the upper part of the supply roll 12 a (electrode roll 11 a) toward the side in the transport direction Y <b> 1 of the electrode 11 and supplied. For this reason, in the manufacturing apparatus 10, the electrode 11 is curved downward due to the brazed warp.

  In the following description, the surface arranged on the inner side in the radial direction of the electrode roll 11a, that is, the surface on the warp direction side of the electrode 11 is referred to as a first electrode surface 11b. Moreover, in the following description, the surface arranged on the outer side in the radial direction of the electrode roll 11a, that is, the surface opposite to the first electrode surface 11b is referred to as a second electrode surface 11c.

On the downstream side of the supply mechanism 12 in the transport direction Y1 of the electrode 11, a correction mechanism 14 is provided as a correction unit that corrects the warpage of the electrode 11 in the longitudinal direction.
The correction mechanism 14 has a cylindrical first guide roll 15a that is supported so as to be rotatable about an axis and guides the electrode 11 in a warping direction of the electrode 11 (downward in the present embodiment). The transport direction Y1 of the electrode 11 is directed downward in the present embodiment by the first guide roll 15a.

  The correction mechanism 14 is supported below the first guide roll 15a so as to be rotatable around the axis, and the conveyance direction Y1 of the electrode 11 guided by the first guide roll 15a is opposite (in the present embodiment, upward). The first straightening roll 16a has a cylindrical shape that is reversed in the direction of heading.

  The straightening mechanism 14 is above the first straightening roll 16a and is supported on the side of the first guide roll 15a so as to be rotatable about an axis, and transports the electrode 11 guided by the first straightening roll 16a. A cylindrical second guide roll 15b that reverses the direction Y1 in the opposite direction (downward in this embodiment) is provided.

  The straightening mechanism 14 is lower than the second guide roll 15b and is supported on the side of the first straightening roll 16a so as to be rotatable about an axis, and transports the electrode 11 guided by the second guide roll 15b. It has a columnar second straightening roll 16b that reverses the direction Y1 in the opposite direction (in this embodiment, the upward direction).

  Further, the correction mechanism 14 is above the second correction roll 16b and is supported so as to be rotatable around the axis on the side of the second guide roll 15b, and is guided by the second correction roll 16b. Has a third guide roll 15c for changing the transport direction Y1.

  And the diameter of each guide roll 15a-15c and each correction | amendment roll 16a, 16b is the same, and is arrange | positioned mutually parallel (substantially parallel). The guide rolls 15a to 15c and the correction rolls 16a and 16b are arranged in parallel in the horizontal direction. Moreover, each guide roll 15a-15c and each correction | amendment roll 16a, 16b are arranged in parallel by the perpendicular direction (up-down direction). In addition, each guide roll 15a-15c and each correction | amendment roll 16a, 16b are the products made from rubber metal, for example.

  And the space | interval (each separation distance of outer peripheral surfaces) along the juxtaposition direction (horizontal direction) of each guide roll 15a-15c is narrower than the diameter of each correction | amendment roll 16a, 16b. In other words, the interval along the direction in which the straightening rolls 16a and 16b are juxtaposed (the distance between the outer peripheral surfaces) is narrower than the diameter of each of the guide rolls 15a to 15c.

  Further, the rotational speed of the first guide roll 15a is set slightly slower than the rotational speed of the third guide roll 15c. For this reason, a slight tension is applied to the electrode 11 along the longitudinal direction between the guide rolls 15a and 15c. Here, in the correction mechanism 14, the tension applied in the longitudinal direction of the electrode 11 is set to 0.08 N or more and 0.15 N or less per 1 mm width of the electrode 11, for example, and the correction of the electrode 11 is performed only by the tension. Much less than possible tension.

  In the correction mechanism 14, the electrode 11 is configured so that the second electrode surface 11 c comes into contact with the outer peripheral surface of each of the correction rolls 16 a and 16 b and follows the outer peripheral surface of each of the correction rolls 16 a and 16 b by a slight tension applied. Be transported. The electrode 11 is in contact with each of the straightening rolls 16a and 16b in the range of, for example, 180 ° or more and 270 ° or less along the circumferential direction of the straightening rolls 16a and 16b. In the present embodiment, each of the correction rolls 16a and 16b is a first roll, and the second electrode surface 11c is a first contact surface.

  Moreover, the electrode 11 is conveyed so that the 1st electrode surface 11b contact | abuts to the outer peripheral surface of each guide roll 15a-15c, respectively, and follows the outer peripheral surface of each guide roll 15a-15c. The electrode 11 contacts the guide rolls 15a to 15c in the range of 180 ° to 270 °, for example, along the circumferential direction of the guide rolls 15a to 15c. Therefore, in this embodiment, each guide roll 15a-15c becomes a 2nd roll, and the 1st electrode surface 11b becomes a 2nd contact surface.

  In the correction mechanism 14, the electrode 11 is divided into a guide roll and a correction roll in the order of the first guide roll 15a → the first correction roll 16a → the second guide roll 15b → the second correction roll 16b → the third guide roll 15c. It abuts alternately several times.

  And the correction mechanism 14 has the heating furnace (high temperature tank) 18 for heating the electrode 11 conveyed by each guide roll 15a-15c and each correction roll 16a, 16b. Each of the guide rolls 15 a to 15 c and the correction rolls 16 a and 16 b constituting the correction mechanism 14 are arranged in the internal space S of the heating furnace 18.

  In the internal space S of the heating furnace 18, for example, a heated heat medium such as air or nitrogen gas is supplied from the outside, and the heat medium is blown onto the electrode 11, whereby the electrode conveyed into the heating furnace 18. 11 is heated uniformly (or substantially uniformly) from its surface.

  Immediately downstream of the correction mechanism 14 in the transport direction Y1, a cooling mechanism 19 is provided as a cooling unit that cools the electrode 11 that has corrected the warp while being heated by the correction mechanism 14 (heating furnace 18). The cooling mechanism 19 sprays the electrode 11 with room temperature such as air or nitrogen gas or a cooled heat medium. In the cooling mechanism 19, the electrode 11 is transported in a flat state, and the shape of the electrode 11 is not changed in the cooling mechanism 19. Further, a mechanism for changing the shape of the electrode 11 is not provided between the cooling mechanism 19 and the correction mechanism 14.

  On the downstream side of the cooling mechanism 19 in the transport direction Y1, the electrode 11 is wound around, for example, a roll around the core material, and a forming mechanism as a forming part that forms the electrode 11 cooled by the cooling mechanism 19 into the electrode roll 11a. 21 is provided. The forming mechanism 21 has a take-up roll 21 a that rotates around the axis and winds up the electrode 11.

Next, the manufacturing method of the electrode 11 by the manufacturing apparatus 10 is demonstrated with the effect | action.
First, the electrode roll 11a is set on the supply roll 12a. Next, the electrode 11 supplied from the supply mechanism 12 is conveyed by the guide rolls 15 a to 15 c of the correction mechanism 14 and the correction rolls 16 a and 16 b to perform a correction process for correcting the warp of the electrode 11.

  More specifically, a slight tension along the longitudinal direction is applied to the electrode 11 due to a difference in rotational speed between the guide rolls 15a and 15c. Thus, in the correction process, the electrode 11 is brought into contact with the outer peripheral surface of each of the correction rolls 16a and 16b and is made to follow the outer peripheral surface, thereby correcting the first electrode 11 in a direction opposite to the warpage in the longitudinal direction of the electrode 11. One correction process is performed a plurality of times (in this embodiment, twice).

  At this time, the electrode 11 is made to follow each correction roll 16a, 16b in the range of 180 degrees or more and 270 degrees or less which becomes more than half a circumference along the circumferential direction of each correction roll 16a, 16b. For this reason, in this embodiment, the range (time) which the electrode 11 and each correction | amendment roll 16a, 16b contact | abut is ensured, and the curvature of the electrode 11 can be further reduced by each correction | amendment roll 16a, 16b.

  In the straightening process, the first straightening process is performed twice by following the two straightening rolls of the first straightening roll 16a and the second straightening roll 16b, so that the first straightening process is performed once. Therefore, the warpage of the electrode 11 can be further reduced as compared with the configuration in which the electrode 11 is corrected.

  Further, in the correction process, a plurality of second correction processes for causing the electrode 11 to warp in the warping direction of the electrode 11 by bringing the electrode 11 into contact with the outer peripheral surface of each guide roll 15a to 15c and following the outer peripheral surface. (3 times in this embodiment).

  In the straightening process, the first straightening process and the second straightening process are alternately performed a plurality of times by alternately bringing the electrodes 11 into contact with the respective guide rolls 15a to 15c and the straightening rolls 16a and 16b. . For this reason, the electrode 11 is alternately bent in a warp direction and in a direction opposite to the warp. Thereby, in this embodiment, the softness | flexibility (soft property) of the active material layer 13b of the electrode 11 is recovered, and the curvature of the electrode 11 can be reduced more.

  In the correction process, the first correction process and the second correction process are performed while heating in the heating furnace 18. For this reason, in the correction process, the entire electrode 11 can be uniformly and rapidly heated as compared with the case where the electrode 11 is heated by, for example, a hot roll. Therefore, the electrode 11 can be corrected more effectively by the correction process.

  In the straightening process, since the heating furnace 18 is used to heat the electrode 11, heating can be performed from the surface of the active material layer 13b that generally has a larger residual stress than the inside. Therefore, it can suppress that correction of each correction roll 16a, 16b becomes inadequate by heating shortage.

  The heating temperature in the straightening process, that is, the temperature of the heat medium supplied into the heating furnace 18 is 120 ° C. or higher. Thereby, the internal stress of the active material layer 13b is reduced, and the electrode 11 can be corrected properly. Further, the temperature of the heat medium supplied into the heating furnace 18 is set to a temperature lower than the thermal decomposition temperature of the binder contained in the active material layer 13b. Thereby, when correcting the electrode 11, it can suppress that a binder thermally decomposes and the active material layer 13b is damaged or peeled off.

  Moreover, in the correction mechanism 14, the tension | tensile_strength provided along the longitudinal direction of the electrode 11 is set to 0.08N or more and 0.15N or less per 1 mm width of the electrode 11, for example. For this reason, when correcting the warp while heating the electrode 11 by the heating furnace 18, the strip-shaped metal foil 13a is torn off by the tension while the electrode 11 is made to follow each of the rolls 15a to 15c, 16a, 16b. Can be avoided.

  Next, a cooling process for cooling the electrode 11 whose warpage has been corrected in the correction process is performed. In this cooling process, the electrode 11 is not deformed and is cooled by spraying a heat medium while keeping the flat state. Therefore, in the present embodiment, it is possible to suppress the occurrence of a new warp in the electrode 11 whose warp has been corrected by the correction mechanism 14.

  Next, a forming step is performed in which the electrode 11 cooled in the cooling step is wound and formed into the electrode roll 11a. In this embodiment, since the electrode 11 that has been warped is corrected by the correction mechanism 14 and cooled by the cooling mechanism 19 is wound, the active material layer 13b of the electrode 11 can be formed even if the electrode 11 is formed into the electrode roll 11a. It is difficult to warp the warp. Moreover, since the process of changing the shape of the electrode 11 is not included between the correction process and the molding process, it is possible to prevent the electrode 11 that has been warped in the correction process from being newly brazed.

  Thereafter, the electrode 11 is punched into a rectangular sheet to form an electrode sheet, and the electrode sheet is laminated in a layered state with a separator interposed therebetween to form an electrode assembly for a lithium ion secondary battery. . At this time, since the warpage of the electrode sheet (electrode 11) is reduced, it is possible to prevent the edge of the electrode assembly from being displaced when the electrode sheets are stacked. Thereafter, the electrode assembly is housed in a case and filled with an electrolyte (electrolytic solution) to complete a lithium ion secondary battery.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) Straightening rolls 16a and 16b for correcting the warp in the direction opposite to the warp in the longitudinal direction of the electrode 11 while releasing the residual stress of the active material layer 13b by heating the electrode 11 in the heating furnace 18, The electrodes 11 are alternately brought into contact a plurality of times with the guide rolls 15a to 15c that are in contact with the one electrode surface 11b. For this reason, the electrode 11 can be corrected to reduce warpage.

  (2) The electrode 11 is brought into contact with each of the straightening rolls 16a and 16b in the range of 180 ° to 270 ° along the circumferential direction of the straightening rolls 16a and 16b. For this reason, by ensuring the range (period) in which the electrode 11 and each of the correction rolls 16a and 16b abut, the electrode 11 is corrected by the correction rolls 16a and 16b, and the warpage can be further reduced.

(3) By cooling and shaping the electrode 11 whose curvature has been corrected by the correction mechanism 14, it is possible to prevent the electrode 11 from newly warping when the electrode 11 is formed.
(4) In the straightening step, the electrode 11 is heated in the heating furnace 18 to release the residual stress of the active material layer 13b, and contact with the straightening rolls 16a and 16b to correct the warp of the electrode 11. The straightening process and the second straightening process in which the first electrode surface 11b of the electrode 11 is brought into contact with the guide rolls 15a to 15c are alternately performed a plurality of times. For this reason, the electrode 11 can be corrected to reduce warpage.

  (5) Before the molding process for molding the electrode 11, a cooling process for cooling the electrode 11 whose warpage has been corrected in the correction process is performed. For this reason, when shaping | molding the electrode 11 to the electrode roll 11a, it can suppress that a curvature arises in the electrode 11 newly.

  (6) In the heating furnace 18, the electrode 11 is heated at a temperature not lower than 120 ° C. and not higher than the thermal decomposition temperature of the binder. For this reason, it can suppress that a binder thermally decomposes, reducing the internal stress of the electrode 11 by heat processing.

  (7) The guide rolls 15a to 15c and the correction rolls 16a and 16b are arranged in a vertical direction. For this reason, compared with the case where it arrange | positions so that each guide roll 15a-15c and each correction | amendment roll 16a, 16b may be located in a line with a horizontal direction, it can suppress that the full length of the manufacturing apparatus 10 becomes long.

  (8) Since the distance along the juxtaposed direction of the guide rolls 15a to 15c is narrower than the diameters of the correction rolls 16a and 16b, the contact range between the rolls 15a to 15c, 16a and 16b and the electrode 11 (Angle) can be widened.

  (9) Since a tension of 0.08 N or more and 0.15 N or less per 1 mm width of the electrode 11 is applied to the electrode 11, the electrode 11 is in contact with the rolls 15 a to 15 c, 16 a, 16 b and the electrode 11. 11 can be prevented from being damaged.

The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 2, each correction | amendment roll 16a, 16b may be comprised combining the some roll. For example, the first straightening roll 16a may be composed of a pair of columnar straightening rolls 22a and 22b that are supported parallel to each other and rotatable about an axis. In this case, the warp of the electrode 11 is corrected while being sandwiched between the correction rolls 22a and 22b. Further, a so-called crown roll may be used in which the outer peripheral surface of the correction roll 22a is formed in a concave shape along the axial direction, while the outer peripheral surface of the correction roll 22b is formed in a convex shape along the axial direction. The correction rolls 22a and 22b may be rotated while bending the central axis by feedback control to correct the electrode 11.

  * You may change arrangement | positioning of each roll 15a-15c, 16a, 16b. For example, you may arrange | position so that each guide roll 15a-15c and each correction | amendment roll 16a, 16b may be located in a line with a horizontal direction (left-right direction).

○ The correction mechanism 14 may have three or more correction rolls. Moreover, the correction mechanism 14 may have two or four or more guide rolls.
The correction mechanism 14 may have a roller that changes the conveyance direction of the electrode 11 separately from the guide rolls 15a to 15c and the correction rolls 16a and 16b.

(Circle) the diameter of each guide roll 15a-15c and each correction roll 16a, 16b does not need to be the same.
(Circle) the space | interval of each guide roll 15a-15c may be wider than the diameter of each correction | amendment roll 16a, 16b, and may be the same.

  Each guide roll 15a-15c and each correction roll 16a, 16b may have a coating layer such as diamond-like carbon, polytetrafluoroethylene, and molybdenum disulfide on the surface. According to this, the friction coefficient of each roll 15a-15c, 16a, 16b can be made small, and consumption of the energy concerning conveyance of the electrode 11 can be reduced.

  In the heating furnace 18, you may heat the strip | belt-shaped metal foil 13a of the electrode 11 by making it heat | fever, for example by induction heating. In the heating furnace 18, a heater may be provided in the internal space S, and the electrode 11 may be heated by radiant heat.

  The forming mechanism 21 may be a device that punches the electrode 11 and forms it into an electrode sheet. According to this configuration, it is possible to suppress punching of the electrode 11 at a position different from the target position due to warpage of the electrode 11.

  The forming mechanism 21 may be a device that winds the positive electrode 11 and the negative electrode 11 with a separator between them to form each electrode 11 into an electrode assembly. According to this, when the electrode 11 is wound due to the warp of the electrode 11, it is possible to suppress the electrode 11 from being displaced at the edge of the electrode assembly.

  (Circle) the shaping | molding mechanism 21 may be an apparatus which cut | disconnects the electrode 11 along a longitudinal direction or the width direction. According to this, it is possible to prevent the electrode 11 from being cut at a position different from the target position to be cut due to the warp of the electrode 11.

O You may embody in the manufacturing method of the electrode for electrical storage apparatuses, such as a nickel hydride secondary battery and an electrical double layer capacitor, and the manufacturing method of an electrode.
O You may materialize in the manufacturing apparatus of the electrode for electrical storage apparatuses used for other than a vehicle, and the manufacturing method of an electrode.

The following technical idea can be grasped from the above embodiment.
(A) The interval between the second rolls is preferably narrower than the diameter of the first rolls.
(B) In the correction part, it is preferable to apply a tension of 0.08N or more and 0.15N or less per 1 mm of the width of the electrode.

  (C) The active material layer includes a binder that binds the active material contained in the active material layer, and the heating temperature in the heating furnace is 120 ° C. or higher and less than the thermal decomposition temperature of the binder. Preferably there is.

  DESCRIPTION OF SYMBOLS 10 ... Manufacturing apparatus (electrode manufacturing apparatus), 11 ... Electrode, 11b ... 1st electrode surface (2nd contact surface), 11c ... 2nd electrode surface (1st contact surface), 13a ... Strip | belt-shaped metal foil, 13b ... active material layer, 14 ... correction mechanism (correction part), 15a ... first guide roll (second roll), 15b ... second guide roll (second roll), 15c ... third guide roll (second roll), 16a ... 1st correction roll (1st roll), 16b ... 2nd correction roll (1st roll), 18 ... Heating furnace, 19 ... Cooling mechanism (cooling part), 21 ... Forming mechanism (forming part).

Claims (5)

An electrode manufacturing apparatus including a correction portion for correcting warpage of a strip-shaped electrode having an active material layer,
The correction part is
A heating furnace;
A plurality of first rolls arranged in the heating furnace and correcting in a direction opposite to the warpage in the longitudinal direction of the electrode by contacting a first contact surface which is one surface of the electrode;
A plurality of second rolls disposed in the heating furnace and in contact with a second contact surface opposite to the first contact surface;
The electrodes are alternately brought into contact with the first roll and the second roll,
The first roll has an upstream first roll located on the upstream side in the transport direction of the electrode, and a downstream first roll located on the downstream side in the transport direction,
The rotational speed of the upstream first roll is set slightly slower than the rotational speed of the downstream first roll,
A cooling unit that cools the electrode that has corrected warpage in the correction unit;
An electrode manufacturing apparatus in which the shape of the electrode is not changed between the correction unit and the cooling unit and in the cooling unit.   2. The electrode manufacturing apparatus according to claim 1, wherein the electrode contacts in a range of 180 ° or more and 270 ° or less along a circumferential direction of the first roll.   The electrode manufacturing apparatus according to claim 1, further comprising a forming unit that changes a shape of the electrode cooled by the cooling unit. An electrode manufacturing method including a correction process for correcting warpage of a strip-shaped electrode having an active material layer,
In the correction process,
A plurality of first correction steps of correcting the first roll in a direction opposite to the warpage in the longitudinal direction of the electrode by bringing the first roll into contact with the first contact surface, which is one surface of the electrode, in the heating furnace; ,
A plurality of second correction steps in which the second roll is brought into contact with a second contact surface which is a surface opposite to the first contact surface in the heating furnace,
The correction process alternately performs the first correction process and the second correction process,
In the straightening step, the rotation speed of the upstream first roll located on the upstream side in the transport direction of the electrode of the first roll is the downstream first roll located on the downstream side in the transport direction of the first roll. It is set slightly slower than the rotation speed of
A cooling step of cooling the electrode that has corrected the warpage in the correction step;
An electrode manufacturing method in which the shape of the electrode is not changed between the correction step and the cooling step and in the cooling step. The manufacturing method of the electrode of Claim 4 which further includes the shaping | molding process which changes the shape of the electrode cooled in the said cooling process.