JP2016051645A - Winder and winding method of electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winder and a winding method of an electrode, capable of suppressing a misalignment of an electrode in a winding axial direction, in an electrode body formed by winding an electrode even when the electrode has a curved portion.SOLUTION: In a winding method of an electrode, a position of an electrode in a transverse direction during conveyance is detected, a position of the electrode in a transverse direction is adjusted on the basis of the detection result, and a conveyance speed of the electrode is increased after a portion including an electrode end part on the outer peripheral side of a roll has been fed out from the roll, the portion having a predetermined length in the electrode.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a winding machine for winding an electrode to form an electrode body, and an electrode winding method.

  2. Description of the Related Art Conventionally, a battery winding machine including a current collector edge position adjusting device (hereinafter simply referred to as “adjusting device”) is known. The adjusting device includes an edge detection unit that detects a position in the width direction of the current collector, a feed shaft for feeding the current collector, and the feed shaft in the axial direction based on a signal from the edge detection unit. Shaft moving means for advancing and retreating (see Patent Document 1). In the adjustment device, when the position in the width direction of the current collector is detected by the edge detection means, the feed shaft advances and retreats in the axial direction, and thereby the current collector wound around the feed shaft The position in the width direction is adjusted. As a result, the position in the width direction of the current collector supplied to the winding position of the battery winding machine is adjusted.

  In the battery winding machine, when the current collector is deviated in the width direction of the current collector from the conveyance path during conveyance, the deviation is corrected by the adjusting device (that is, the current collector being conveyed). Position in the width direction is adjusted). For this reason, displacement of the position of the electrode in the winding axis direction in the current collector (winding group) wound at the winding position (that is, the current collector is displaced in the width direction at the winding position). Variation in the position of the electrode in the winding axis direction that occurs in the winding group can be suppressed.

  In recent years, further improvement in the production efficiency of the wound group has been demanded. Therefore, in the battery winding machine described above, it is conceivable to increase the current collector transport speed and also increase the current collector winding speed at the winding position.

  However, when the current carrying speed of the current collector increases, the forward and backward movement of the feeding shaft in the axial direction cannot follow the speed at which the current collector being conveyed shifts in the width direction, and the current collected at the take-up position cannot be followed. In some cases, the displacement of the position of the electrode in the winding axis direction in the electric body (the winding group) becomes large. In particular, when the current collector has a curved portion (curved in the short direction with respect to the longitudinal direction), the positional deviation of the electrode in the winding axis direction in the wound group becomes significant.

JP 9-129260 A

  Accordingly, in view of the above problems, the present invention provides a winding machine that can suppress the displacement of the position of the electrode in the winding axis direction in the electrode body around which the electrode is wound even if the electrode has a curved portion. It is another object of the present invention to provide an electrode winding method.

  The inventors of the present invention have conducted extensive research to solve the above problems, and as a result, in the roll in which the electrode for forming the electrode body is wound, due to the manufacturing method of the electrode, In the tip part (the part of the electrode having a predetermined length including the electrode end (tip) located on the outer peripheral surface of the roll), the amount of bending in the short direction relative to the longitudinal direction is larger than the remaining part of the electrode. I learned that there are many cases. Details are as follows.

  The electrode is coated with an active material leaving one end portion in the short direction on the surface of the band-shaped metal foil, and the metal foil in a state in which this active material is coated is rolled into a roll after roll pressing, It is formed by vacuum drying the roll. The vacuum drying is performed to firmly fix the active material to the metal foil.

  During the vacuum drying, the metal foil is stretched by heat. At this time, in the electrode, the elongation rate differs between a portion where the active material is applied and a portion where the active material is not applied. In addition, the wound electrode tends to unwind from the inner peripheral surface of the roll toward the outer peripheral surface due to the elongation, but since the electrode end portion is fixed on the outer peripheral surface of the roll, the outer peripheral surface of the roll The closer the part is, the more the force to unwind is accumulated and the greater the force is applied. As a result, the tip portion of the electrode tends to be greatly bent with the side end portion not coated with the active material inside, that is, the amount of bending tends to be large. In addition, in the electrode manufacturing process, the electrode may be bent during roll pressing.

  Therefore, based on this knowledge, the inventors of the roll are likely to have a large amount of bending at the tip end portion of the electrode, so that the predetermined portion including the electrode end portion is wound (wound up). ) Focusing on the fact that when the electrode body is formed, the electrode body is likely to be displaced in the winding axis direction due to the bending, and a winding machine having the following configuration and a method for winding the electrode are provided. Created.

The winding machine according to the present invention is
A supply section capable of delivering the electrode from a roll of electrode strips;
An electrode transport section for transporting the electrode fed from the supply section;
A separator transport section for transporting a strip-shaped separator;
A winding part for winding the electrode and the separator conveyed by the electrode conveying part and the separator conveying part so that the separator is located between the electrodes;
A sensor unit for detecting a position of the electrode in a short direction during conveyance;
An electrode adjusting unit that adjusts the position of the electrode being conveyed in the short direction based on the detection result in the sensor unit;
A detection unit capable of detecting the length from the tip of the electrode delivered from the roll;
A controller that adjusts the transport speed of the electrode in the electrode transport section,
The control unit increases the conveyance speed of the electrode in the electrode conveyance unit after a tip part including the tip in the electrode is sent out from the roll based on a detection result in the detection unit.

  In such a configuration, in order to improve the production efficiency of the electrode body, even if the conveyance speed (set speed) when the electrode is usually conveyed is set to be high, the electrode is highly likely to be greatly curved ( The electrode transport speed is increased after the tip portion is fed from the roll, that is, the transport speed (initial speed) when the tip portion is transported is kept low (reduced), and the electrode is transported after the tip portion is transported. By increasing the conveyance speed of the electrode body, the electrode adjustment unit causes the electrode in the short direction of the electrode when the electrode being conveyed is displaced in the short direction due to the curvature while improving the production efficiency of the electrode body. This prevents the position adjustment from following the shift. For this reason, even in the electrode body formed by winding the tip portion of the electrode (the portion that is highly likely to be curved), the displacement of the electrode position in the winding axis direction can be suppressed.

  The length of the tip portion including the tip is preferably at least 0.6% of the entire length of the electrode fed from the roll.

  Usually, due to the heat applied to the electrode during manufacturing, the portion closer to the outer peripheral surface of the roll has a larger amount of bending of the electrode constituting the roll. For this reason, according to the above configuration, a portion having a large bending amount (a portion within 0.6% of the total length from the tip of the electrode) is wound so that the position adjustment in the short direction of the electrode by the electrode adjustment unit cannot be followed. Until this occurs, it is possible to reliably prevent the conveyance speed from increasing. Thereby, even in an electrode body formed by winding the tip portion of the electrode (a portion that is highly likely to be curved), the displacement of the electrode position in the winding axis direction can be reliably suppressed.

  The detection unit is sent out from the roll based on at least one of the diameter of the roll, the rotation amount of the roll, the transport distance of the electrode in the transport unit, and the transport speed of the electrode in the transport unit. You may detect the length from the front-end | tip of an electrode.

  According to such a configuration, the length of the electrode fed from the roll can be accurately detected from a value that is easy to detect, such as the diameter of the roll, without directly measuring the length of the electrode fed from the roll.

In the winding machine,
It is preferable that a plurality of the electrode adjustment units are provided along the transport path of the electrodes.

  According to this configuration, since the position of the electrode (electrode being transported) in the short direction is adjusted at a plurality of positions on the transport path, the electrode supplied (transported) to the winding unit in the short direction is adjusted. The positional shift is further suppressed, and the positional shift of the electrode in the winding axis direction in the formed electrode body is more preferably suppressed.

Thus, when a plurality of first adjustment units are provided in the winding machine,
A plurality of the sensor units are provided along the transport path,
More preferably, each of the plurality of electrode adjustment units adjusts the position of the electrode in the short direction based on the detection result of the corresponding sensor unit.

  According to such a configuration, since the electrode adjustment unit corresponding to the sensor unit adjusts the positional deviation of the electrode detected by the sensor unit, each adjustment position (that is, each electrode adjustment unit is not connected to the electrode). The accuracy of the electrode position adjustment at the position for position adjustment is improved. Thereby, the shift | offset | difference of the electrode of the winding axis direction in the electrode body formed in the winding part is suppressed more effectively.

In the winding machine,
The at least one electrode adjusting unit may adjust the position of the electrode in the short direction at a position downstream of the position where the sensor unit in the electrode transport path detects the position of the electrode in the short direction.

  According to such a configuration, since the position adjustment of the electrode in the short direction is performed at a position downstream from the position where the position in the short direction is detected, the portion of the electrode where the position in the short direction is actually detected by the sensor unit In contrast, the position of the electrode adjusting unit can be adjusted. For this reason, the position adjustment in the short direction of an electrode is performed more accurately.

In the winding machine,
It is preferable that the at least one electrode adjusting unit adjusts the position of the electrode in the short direction at a position downstream of the intermediate position of the transport path in the transport path of the electrode.

  According to such a configuration, since the position in the short direction of the electrode is adjusted at a position close to the winding part (downstream position from the intermediate position of the transport path), the position far from the winding part (upstream from the intermediate position of the transport path). As compared with the case where the position in the short direction of the electrode is adjusted in the position), the displacement of the position in the short direction of the electrode supplied to the winding portion is effectively suppressed. As a result, the displacement of the position of the electrode in the winding axis direction in the electrode body formed by the winding part is further suppressed.

In the winding machine,
The supply unit rotates the roll around the central axis of the roll and can feed the electrode from the roll, and the rotation axis is based on the detection result of the sensor unit. A roll adjusting unit that moves in the core direction.

  According to this configuration, since the position of the electrode in the short direction is adjusted even at the electrode delivery position, the displacement of the position of the electrode in the winding axis direction in the electrode body formed by the winding portion is further suppressed. .

In the winding machine,
The winding part rotates around the axis to wind the electrode and the separator, and the winding axis is based on the detection result of the sensor part. And an axis adjustment unit that moves in the direction.

  According to this configuration, the position of the electrode supplied to the winding body in the short direction is adjusted with respect to the winding body (the electrode and the separator wound around the winding shaft) in the winding unit. Therefore, the displacement of the position of the electrode in the winding axis direction in the electrode body formed by the winding part is further suppressed.

In the winding machine,
The electrode includes a positive electrode and a negative electrode,
The roll includes a positive electrode roll and a negative electrode roll,
The supply unit includes a positive electrode supply unit that sends out the positive electrode from the positive electrode roll, and a negative electrode supply unit that sends out the negative electrode from the negative electrode roll,
The electrode transport unit includes a positive electrode transport unit that transports the positive electrode, and a negative electrode transport unit that transports the negative electrode.
The winding part winds the positive electrode, the negative electrode, and the separator so that the separator is positioned between the positive electrode and the negative electrode,
The sensor unit includes a positive electrode sensor unit that detects a position in a short direction of the positive electrode during conveyance, and a negative electrode sensor unit that detects a position in a short direction of the negative electrode during conveyance,
The electrode adjustment unit adjusts the position of the positive electrode in the short direction based on the detection result of the positive electrode sensor unit, and the short direction of the negative electrode based on the detection result of the negative electrode sensor unit A negative electrode adjusting part for adjusting the position of
The detection unit includes a positive electrode detection unit capable of detecting a length from the tip of the positive electrode sent out from the positive electrode roll, and a negative electrode detection unit capable of detecting a length from the tip of the negative electrode sent out from the negative electrode roll. Have
Based on the detection results of the positive electrode detection unit and the negative electrode detection unit, the control unit sends out a tip part including the tip in the positive electrode from the positive electrode roll, and a tip part including the tip in the negative electrode After being fed out from the negative electrode roll, the positive electrode transport speed in the positive electrode transport section and the negative electrode transport speed in the negative electrode transport section may be increased.

  According to such a configuration, even in an electrode body formed by winding the tip portion (a portion that is highly likely to be curved) of the positive electrode and the negative electrode, the position in the winding axis direction of at least one of the positive electrode and the negative electrode Deviation is suppressed.

In the winding machine,
The control unit is configured to control the tip part based on a detection result of the detection part and a control unit that controls a transport speed of the electrode in the electrode transport part when the tip part of the electrode is sent out from the roll. A late control unit that controls the electrode conveyance speed in the electrode conveyance unit when the remaining part of the electrode except the electrode is fed from the roll, and a short in the longitudinal direction of the electrode based on the detection result in the sensor unit A curvature detection unit that detects the amount of curvature in the hand direction,
The late control unit may change the transport speed of the electrode in the electrode transport unit based on the amount of curvature detected by the curvature detection unit.

  According to such a configuration, even if there is a portion with a large curvature amount (a predetermined size or more) on the electrode other than the tip portion, the portion is detected and the transport speed of the portion at the electrode transport portion is changed. Can be made. For this reason, even if an electrode body is formed using an electrode having a portion with a large amount of curvature at an intermediate position in the longitudinal direction by the winding machine, the position of the electrode in the winding axis direction in the formed electrode body Deviation is suppressed.

in this case,
The late control unit may decrease the transport speed of the electrode in the electrode transport unit when the bending amount is equal to or larger than a predetermined magnitude.

  According to such a configuration, a portion with a large curvature amount is included in the middle position of the electrode to be transported by a simple control such as reducing the transport speed of the electrode when the curvature amount exceeds a predetermined value (predetermined size). Even in this case, the positional deviation of the electrode in the winding axis direction in the electrode body formed in the winding portion can be suppressed.

Also,
The late control unit may decrease the transport speed of the electrode in the electrode transport unit as the amount of bending increases.

  According to such a configuration, the portion with the larger bending amount is transported at a lower transport speed, and therefore, when the electrode being transported is displaced in the short direction due to the bending, It is possible to more reliably prevent the position adjustment in the short direction from being followed.

The electrode winding method according to the present invention includes:
An electrode winding method for winding the conveyed electrode and the separator so that the separator is positioned between the electrodes while conveying the strip-shaped separator and the electrode fed from the roll of the strip-shaped electrode. And
The position in the short direction of the electrode being transported is detected, the position in the short direction of the electrode is adjusted based on the detection result, and a portion of the electrode having a predetermined length is disposed on the outer peripheral side of the roll. After a portion including a certain electrode end is sent out from the roll, the conveying speed of the electrode is increased.

  In such a configuration, in order to improve the production efficiency of the electrode body, even if the conveyance speed (set speed) when the electrode is usually conveyed is set to be high, the electrode is highly likely to be greatly curved ( The electrode transport speed is increased after the tip portion is fed from the roll, that is, the transport speed (initial speed) when the tip portion is transported is kept low (reduced), and the electrode is moved after the tip portion is transported. By increasing the transport speed of the electrode, it is possible to improve the electrode body production efficiency and to adjust the position of the electrode in the short direction when the electrode being transported is displaced in the short direction due to the curvature. It prevents you from following the gap. For this reason, even in the electrode body formed by winding the tip portion of the electrode (the portion that is highly likely to be curved), the displacement of the electrode position in the winding axis direction can be suppressed.

  As described above, according to the present invention, even if there is a curved portion in the electrode, the winding machine can suppress the displacement of the position of the electrode in the winding axis direction in the electrode body in which the electrode is wound, and An electrode winding method can be provided.

FIG. 1 is a schematic configuration diagram of a winding machine according to the present embodiment. FIG. 2 is a diagram illustrating an electrode, a separator, and an electrode body. FIG. 3 is a diagram for explaining the position adjustment unit. FIG. 4 is a diagram for explaining the supply unit. FIG. 5 is a block diagram illustrating a configuration of the control unit. FIG. 6 is a diagram for explaining the bending of the electrodes. FIG. 7 is a diagram illustrating an operation flow in the winding machine. FIG. 8 is a perspective view showing an example of a power storage element in which an electrode body formed by a winding machine is incorporated.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  The winding machine forms an electrode body by winding a strip-shaped (band-shaped) electrode and a strip-shaped (band-shaped) separator. The winding machine of this embodiment forms the electrode body used for nonaqueous electrolyte secondary batteries, such as a lithium ion secondary battery, for example. Specifically, as shown in FIG. 1, the winding machine winds (winds up) the electrode transport unit 3 that transports the electrode 2, the separator transport unit 5 that transports the separator 4, and the electrode 2 and the separator 4. ) Each of the winding unit 6, the sensor unit 7 for detecting the positions of the electrode 2 and the separator 4 being conveyed, the position adjusting unit 8 for adjusting the positions of the electrode 2 and the separator 4 being conveyed, and the winding machine 1 And a control unit 9 that controls the components. The winding machine 1 of this embodiment includes a supply unit 10 that can send out the electrode 2 and the like, and a detection unit 17 that can detect the length from the tip of the electrode 2 sent out from the supply unit 10. Hereinafter, first, the electrode 2 and the separator 4 wound (wound up) by the winding machine 1 will be described with reference to FIG. 2, and then the winding machine 1 will be specifically described.

  The electrode 2 of the present embodiment includes a positive electrode 21 and a negative electrode 22.

  The positive electrode 21 includes a strip-shaped metal foil 211 and a positive electrode active material layer 212 formed on the metal foil 211. The metal foil 211 of this embodiment is, for example, an aluminum foil. The positive electrode 21 has a non-covered portion of the positive electrode active material layer 212 (a portion where the positive electrode active material layer 212 is not formed) at one end in the short direction of the belt shape.

  The positive electrode active material layer 212 includes a positive electrode active material and a binder. The positive electrode active material is, for example, a lithium metal oxide. The binder is, for example, polyvinylidene fluoride. The positive electrode active material layer 212 may further include a conductive additive such as acetylene black.

  The positive electrode 21 configured as described above is manufactured as follows. First, a positive electrode active material or the like is applied to the surface of the strip-shaped metal foil 211 to form the positive electrode active material layer 212. At this time, the positive electrode active material or the like is applied while leaving one end portion of the metal foil 211 in the short direction. The metal foil 211 coated with the positive electrode active material is pressed and then wound into a roll. Then, the roll (the roll of the metal foil 211 on which the positive electrode active material layer 212 is formed) is vacuum-dried in order to firmly fix the positive electrode active material layer 212 to the metal foil 211, and the positive electrode 21 is completed.

  The negative electrode 22 includes a strip-shaped metal foil 221 and a negative electrode active material layer 222 formed on the metal foil 221. The metal foil 221 of this embodiment is, for example, a copper foil. The negative electrode 22 has a non-covered portion of the negative electrode active material layer 222 (a portion where the negative electrode active material layer 222 is not formed) at the other end of the strip shape in the short direction (the side opposite to the non-covered portion of the positive electrode 21). Have

  The negative electrode active material layer 222 includes a negative electrode active material and a binder. The negative electrode active material is, for example, a carbon material such as non-graphitizable carbon or graphitizable carbon, or a material that causes an alloying reaction with lithium ions such as silicon (Si). The binder is, for example, polyvinylidene fluoride. The negative electrode active material layer 222 may further include a conductive additive such as acetylene black.

  The negative electrode 22 configured as described above is manufactured in the same manner as the positive electrode 21. That is, the negative electrode 22 is formed on the surface of the strip-shaped metal foil 221 with the negative electrode active material layer 222 leaving one end in the short direction, and the metal foil 221 in a state where the negative electrode active material layer 222 is formed is pressed. Later, it is formed by being wound into a roll and vacuum-dried.

  The separator 4 is a strip-shaped member having insulating properties. The separator 4 is comprised by porous membranes, such as polyethylene, a polypropylene, a cellulose, polyamide, for example.

Each of the positive electrode 21, the negative electrode 22, and the separator 4 described above is disposed in the supply unit 10 in a state of being wound in a roll shape (a state of being in a roll when vacuum dried). That is, the winding machine 1 of this embodiment, in order to form the electrode body 23, a roll (positive roll) R ₁ of the cathode 21, and a roll (negative roll) R ₂ of the anode 22, the separator 4 rolls ( a first roll R ₃ and the second roll R _4), but is disposed in the supply portion 10 of the wound machine 1.

  Next, each structure of the winding machine 1 is demonstrated concretely.

  The electrode transport unit 3 includes a positive electrode transport unit 31 that transports the positive electrode 21 and a negative electrode transport unit 32 that transports the negative electrode 22. The electrode transport unit 3 adjusts the transport speed of the electrode 2 based on the output signal from the control unit 9. Specifically, the positive electrode transport unit 31 adjusts the transport speed of the positive electrode 21 and the negative electrode transport unit 32 adjusts the transport speed of the negative electrode 22 based on an output signal from the control unit 9.

  The positive electrode transport unit 31 has at least one transport roller 311 and transports (guides) the positive electrode 21 sent from the supply unit 10 to the winding unit 6. The positive electrode transport unit 31 of the present embodiment has a plurality of transport rollers 311. The plurality of transport rollers 311 are arranged such that the positive electrode 21 goes to the winding unit 6 through a predetermined transport path. The plurality of transport rollers 311 are applied with a substantially constant tension in the longitudinal direction with respect to the positive electrode 21 to be transported, and the positive electrode 21 is fed (supplied) to the winding unit 6 with a substantially constant tension. Respectively.

  The negative electrode conveyance unit 32 includes at least one conveyance roller 321 and conveys (guides) the negative electrode 22 sent out from the supply unit 10 to the winding unit 6. The negative electrode conveyance unit 32 of the present embodiment has a plurality of conveyance rollers 321. The plurality of transport rollers 321 are arranged such that the negative electrode 22 goes to the winding unit 6 through a predetermined transport path. The plurality of transport rollers 321 are applied with a substantially constant tension in the longitudinal direction on the negative electrode 22 to be transported, and the negative electrode 22 is fed (supplied) to the winding unit 6 with a substantially constant tension. Respectively.

  The separator transport unit 5 transports the separator 4 sent out from the supply unit 10 to the winding unit 6. The separator transport unit 5 according to this embodiment includes a first transport unit 51 and a second transport unit 52. Each conveyance part 51 and 52 conveys the separator 4 from a supply part 10 to the winding part 6 by a mutually different conveyance path | route. Each of the conveyance units 51 and 52 includes at least one conveyance roller 511 and 521. The 1st and 2nd conveyance parts 51 and 52 of this embodiment have a plurality of conveyance rollers 511 and 521, respectively. The plurality of transport rollers 511 and 521 are applied with a substantially constant tension in the longitudinal direction with respect to the separator 4 to be transported, and the separator 4 is fed (supplied) to the winding unit 6 with a substantially constant tension. ) Are configured as above.

  The first transport unit 51 transports the separator 4 so that the separator 4 is supplied to the winding unit 6 so as to be positioned between the positive electrode 21 and the negative electrode 22. Below, the separator conveyed by the 1st conveyance part 51 may be called the 1st separator 41. FIG. In the winding unit 6, the second transport unit 52 is configured so that the negative electrode 22 is positioned between the separator 4 transported by the first transport unit 51 and the separator 4 transported by the second transport unit 52. 4 is transported. Below, the separator conveyed by the 2nd conveyance part 52 may be called the 2nd separator 42. FIG.

  The winding unit 6 winds the electrode 2 and the separator 4 transported by the electrode transport unit 3 and the separator transport unit 5 so that the separator 4 is positioned between the electrodes 2. Specifically, the winding unit 6 winds the positive electrode 21, the negative electrode 22, and the separators 41, 42 such that the separators 41, 42 are positioned between the positive electrode 21 and the negative electrode 22. More specifically, the winding unit 6 winds the positive electrode 21, the first separator 41, the negative electrode 22, and the second separator 42 in an overlapped state. The winding unit 6 includes a winding shaft 61 that winds the electrode 2 (specifically, the positive electrode 21 and the negative electrode 22) and the separator 4 (specifically, the first separator 41 and the second separator 42). The winding unit 6 detects the rotation speed (rotation amount) of the winding shaft 61 and outputs the detection result to the control unit 9 as a winding signal.

  The winding shaft 61 winds the positive electrode 21, the first separator 41, the negative electrode 22, and the second separator 42 by rotating around the axis 610 of the winding shaft 61. The winding shaft 61 rotates at a rotation speed (rotation speed) based on a rotation speed signal input from the control unit 9. Specifically, the winding shaft 61 rotates at a rotational speed corresponding to the transport speed of the electrode 2 and the separator 4 in the electrode transport unit 3 and the separator transport unit 5. The axis 610 of the winding shaft 61 is in the same direction as the short direction of the positive electrode 21, the first separator 41, the negative electrode 22, and the second separator 42 wound (wound) by the winding shaft 61. Extend. That is, in the winding unit 6, the positive electrode 21, the first separator 41, the negative electrode 22, and the second separator 42 are wound by the winding shaft 61 in a state where the short sides are overlapped with each other. Turned. The winding shaft 61 of the present embodiment winds the positive electrode 21, the first separator 41, the negative electrode 22, and the second separator 42 on the outer peripheral surface of the winding core with the cylindrical winding core attached ( Take up).

  The sensor unit 7 includes an electrode sensor unit that detects the position of the electrode 2 being transported in the short direction. The electrode sensor unit of the present embodiment includes at least one first sensor unit (positive electrode sensor unit) 71 that detects the position of the positive electrode 21 being transported in the short direction and the position of the negative electrode 22 being transported in the short direction. And at least one second sensor part (negative electrode sensor part) 72 to be detected. The sensor unit 7 also includes at least one third sensor unit 73 that detects the position of the separator 4 being conveyed in the short direction. Each sensor part 71,72,73 outputs a detection result to the control part 9 as a sensor detection signal, respectively.

  A plurality of the first sensor units 71 of the present embodiment are arranged along the transport path of the positive electrode 21. The first sensor unit 71 detects the position of the positive electrode 21 in the short direction by detecting the position of one edge (edge) in the short direction of the positive electrode 21. A plurality of second sensor units 72 of the present embodiment are arranged along the conveyance path of the negative electrode 22. Similar to the first sensor unit 71, the second sensor unit 72 detects the position of the negative electrode 22 in the short direction by detecting the position of one edge of the negative electrode 22 in the short direction. A plurality of third sensor units 73 according to the present embodiment are arranged along the transport path of the separators 41 and 42. Similar to the first sensor unit 71 and the second sensor unit 72, the third sensor unit 73 detects the position of one edge of the separators 41 and 42 in the short direction, thereby causing the separators 41 and 42 in the short direction. The position is detected. In the present embodiment, the number of third sensor units 73 arranged along the conveyance path of the first separator 41 in the first conveyance unit 51 and the conveyance path of the separator 42 in the second conveyance unit 52 are arranged. The number of third sensor units 73 is the same, but is not limited to this configuration. That is, the number of third sensor units 73 arranged in the first conveyance unit 51 and the number of third sensor units 73 arranged in the second conveyance unit 52 may be different.

  The position adjustment unit 8 includes an electrode adjustment unit 80 that adjusts the position of the electrode 2 being conveyed in the short direction based on the detection result of the sensor unit 7 (specifically, the electrode sensor unit). In the present embodiment, a plurality of electrode adjustment units 80 are arranged along the transport path of the electrode 2 in the electrode transport unit 3. Each of the plurality of electrode adjustment units 80 adjusts the position of the electrode 2 in the short direction based on the detection result by the corresponding sensor unit 71, 72 among the plurality of sensor units 71, 72. The position adjustment unit 8 also includes at least one separator adjustment unit 83 that adjusts the position of the separators (first and second separators) 41 and 42 in the short direction based on the detection result of the third sensor unit 73. .

  At least one electrode adjustment unit 80 adjusts the position of the electrode 2 in the short direction at a position downstream of the position where the sensor unit 7 in the transport path of the electrode 2 detects the position of the electrode 2 in the short direction. According to this configuration, the position adjustment in the short direction of the electrode 2 is performed at a position downstream from the position where the position in the short direction is detected in the transport path of the electrode 2. For this reason, the electrode adjustment part 80 adjusts the position with respect to the site | part of the electrode 2 in which the position of the transversal direction was actually detected by the sensor part 7. As a result, the position adjustment of the electrode 2 in the short direction is performed with higher accuracy.

  Further, at least one electrode adjusting unit 80 adjusts the position of the electrode 2 in the short direction at a position downstream from the intermediate position of the transport path of the electrode 2. According to this configuration, the position of the electrode 2 in the short direction is adjusted at a position close to the winding portion 6 (downstream position from the intermediate position). For this reason, compared with the case where the position in the short direction of the electrode 2 is adjusted at a position far from the winding part 6 (upstream position from the intermediate position), the short direction of the electrode 2 supplied to the winding part 6 is adjusted. Deviation is effectively suppressed. As a result, the displacement of the position of the electrode 2 in the winding axis direction in the electrode body 23 formed by the winding part 6 is suppressed.

  Specifically, the electrode adjustment unit 80 includes at least one positive electrode adjustment unit 81 that adjusts the position of the positive electrode 21 in the short direction based on the detection result of the first sensor unit 71, and the detection result of the second sensor unit 72. And at least one negative electrode adjustment unit 82 that adjusts the position of the negative electrode 22 in the short direction.

  A plurality of positive electrode adjustment units 81 of the present embodiment are provided along the conveyance path of the positive electrode 21 (the same number as the first sensor units 71 in the example of the present embodiment). Specifically, each positive electrode adjustment unit 81 is arranged at a position corresponding to each of the plurality of first sensor units 71 arranged along the conveyance path of the positive electrode 21. In the example of this embodiment, each positive electrode adjustment unit 81 is a position adjacent to the position where the corresponding first sensor unit 71 detects the position of the positive electrode 21 in the short direction in the conveyance path of the positive electrode 21, and the detection is performed. It arrange | positions in the downstream position from the position to perform. At least one positive electrode adjustment unit 81 is disposed at a position downstream of the intermediate position of the conveyance path of the positive electrode 21.

  As shown in FIG. 3, the positive electrode adjustment unit 81 includes a pair of rollers 811 and a drive unit 812 that drives the pair of rollers 811 in the axial direction of the rollers 811. The pair of rollers 811 are arranged in parallel so as to sandwich the positive electrode 21 in the conveyance path of the positive electrode 21. Each roller 811 is configured to be rotatable around the axis so that the positive electrode 21 can move in the longitudinal direction. The drive unit 812 moves the pair of rollers 811 in the axial direction based on the instruction signal from the control unit 9. As a result, the position of the positive electrode 21 being conveyed while being sandwiched between the pair of rollers 811 is adjusted.

  A plurality of negative electrode adjustment units 82 of the present embodiment are provided along the conveyance path of the negative electrode 22 (the same number as the second sensor units 72 in the example of the present embodiment). Specifically, each negative electrode adjustment unit 82 is arranged at a position corresponding to each of the plurality of second sensor units 72 arranged along the conveyance path of the negative electrode 22. In the example of this embodiment, each negative electrode adjustment unit 82 is a position adjacent to the position where the corresponding second sensor unit 72 detects the position of the negative electrode 22 in the short direction in the conveyance path of the negative electrode 22, and the detection is performed. It arrange | positions in the downstream position from the position to perform. The at least one negative electrode adjustment unit 82 is disposed at a position downstream of the intermediate position of the conveyance path of the negative electrode 22.

  The negative electrode adjustment unit 82 has the same configuration as the positive electrode adjustment unit 81. That is, the negative electrode adjustment unit 82 includes a pair of rollers 811 and a drive unit 812 that drives the pair of rollers 811 in the axial direction of the rollers 811. The negative electrode adjusting unit 82 is conveyed while being sandwiched between the pair of rollers 811 by the drive unit 812 moving the pair of rollers 811 in the axial direction based on an instruction signal from the control unit 9. Adjust the position in the short direction.

  A plurality of separator adjustment sections 83 of the present embodiment are provided along the transport path of the first separator 41 in the first transport section 51 (the same number as the third sensor sections 73 in the first transport section 51 in the example of the present embodiment). Provided. A plurality of separator adjustment units 83 are provided along the conveyance path of the second separator 42 in the second conveyance unit 52 (the same number as the third sensor units 73 in the second conveyance unit 52 in the example of the present embodiment). . Specifically, each separator adjustment unit 83 is arranged at a position corresponding to each of the plurality of third sensor units 73 arranged along the conveyance path of the separators 41 and 42. In the example of the present embodiment, each separator adjustment unit 83 is a position adjacent to the position where the third sensor unit 73 detects the position of the separators 41 and 42 in the short direction in the transport path of the separators 41 and 42. It arrange | positions in the downstream position from the said detection position, respectively. At least one separator adjusting unit 83 is disposed at a position downstream of the intermediate position of the transport path of the separators 41 and 42.

  The separator adjustment unit 83 has the same configuration as the positive electrode adjustment unit 81. That is, the separator adjustment unit 83 includes a pair of rollers 811 and a drive unit 812 that drives the pair of rollers 811 in the axial direction of the rollers 811. The separator adjustment unit 83 is configured so that the drive unit 812 moves the pair of rollers 811 in the axial direction based on an instruction signal from the control unit 9, thereby conveying the separator 41 while being sandwiched between the pair of rollers 811. , 42 in the short direction is adjusted.

  The supply unit 10 includes an electrode supply unit 11 that sends the electrode 2 to the electrode transport unit 3, and a separator supply unit 12 that sends the separator 4 to the separator transport unit 5.

Electrode feed unit 11, the electrodes 2 rolls (positive roll _{R 1,} and the negative electrode roll _{R 2)} of the roll _R 1, the rotated around the central axis of the _{R 2} roll _R 1, the _{R 2} to the electrode 2 electrode It is sent out (supplied) to the transport unit 3. The electrode supply unit 11 of the present embodiment includes a positive electrode supply unit 13 that sends (supplies) the positive electrode 21 to the positive electrode transport unit 31 and a negative electrode supply unit 14 that sends (supplies) the negative electrode 22 to the negative electrode transport unit 32. .

As shown in FIG. 4, the positive electrode supply unit 13 includes a rotating shaft 131 on which the positive electrode roll R ₁ is disposed, and a roll adjusting unit 132 that drives the rotating shaft 131 in the axial direction of the rotating shaft 131. Rotary shaft 131 rotatably holds a positive roll R ₁ the central axis of the positive electrode roll R ₁ around (axis of the rotary shaft 131). That is, the positive electrode roll R ₁ is attached to the rotary shaft 131 so that the central axis of the positive electrode roll R _{1 and} the axis of the rotary shaft 131 coincide. The roll adjusting unit 132 moves the rotating shaft 131 in the axial direction of the rotating shaft 131 based on the detection result of the sensor unit 7 (specifically, the first sensor unit 71). Specifically, the roll adjustment unit 132 rotates the rotation shaft 131 in a state where the positive electrode roll R ₁ is disposed, and moves the rotation shaft 131 in the axial direction of the rotation shaft 131 based on an instruction signal from the control unit 9. Move. Thereby, the position of the short side direction of the positive electrode 21 sent out from the positive electrode supply part 13 to the positive electrode conveyance part 31 is adjusted.

The negative electrode supply unit 14 has the same configuration as the positive electrode supply unit 13. That is, the negative electrode supply unit 14 includes a rotation shaft 131 and a roll adjustment unit 132. Therefore, the negative electrode supply section 14, roll adjustment part 132, while rotating the rotary shaft 131 in a state where the negative electrode roll R ₂ is arranged, the rotary shaft rotating shaft 131 based on an instruction signal from the controller 9 131 is moved in the axial direction. Thereby, the position of the short direction of the negative electrode 22 sent out from the negative electrode supply part 14 to the negative electrode conveyance part 32 is adjusted.

  The separator supply unit 12 sends (supplies) the first separator 41 to the first transport unit 51, and the second supply unit 16 sends (supplies) the second separator 42 to the second transport unit 52. And having.

Each of the first supply unit 15 and the second supply unit 16 has the same configuration as that of the positive electrode supply unit 13. That is, each of the first supply unit 15 and the second supply unit 16 includes a rotation shaft 131 and a roll adjustment unit 132. Thus, the first supply portion 15 and the second supply unit 16, the roll adjustment unit 132, a state where the roll of the separator 41 (first roll _{R 3} and the second roll _{R 4)} is arranged rotating shaft 131 , And the rotating shaft 131 is moved in the axial direction of the rotating shaft 131 based on the instruction signal from the control unit 9. Thereby, the position of the transversal direction of the separators 41 and 42 sent out from the 1st supply part 15 and the 2nd supply part 16 to the 1st conveyance part 51 and the 2nd conveyance part 52 is adjusted, respectively.

Detector 17 includes a positive electrode detector 171 for detecting the length from the tip of the cathode 21 sent out from the positive electrode roll R _1, a negative electrode detector for detecting the length from the tip in the anode 22 fed from the anode roll R ₂ 172. Here, the positive electrode 21 and the tip of the cathode 21, which is located on the outer circumferential surface of the positive electrode roll R ₁ in the positive electrode roll R ₁ when it is placed on the positive electrode supply unit 13 (i.e., a state in which the cathode 21 is not pulled out) Is one end in the longitudinal direction. Similarly, the tip of the negative electrode 22 is one end in the longitudinal direction of the negative electrode 22 located on the outer peripheral surface of the negative electrode roll R ₂ when it is disposed in the negative electrode supply unit 14.

Specifically, the positive electrode detecting unit 171, based on a change in diameter of the positive electrode roll R _1, detects a length from the tip of the cathode 21 fed from the positive supply unit 13. Specifically, the positive detection unit 171 measures the diameter of the positive electrode roll R _1, from a change in the diameter, detects a length from the tip of the cathode 21 fed from the positive electrode roll R _1. Similarly, the negative detector 172 is also based on a change in diameter of the negative electrode roll R _2, detects a length from the tip of the anode 22 fed from the negative electrode supply section 14. Each of the detection units 171 and 172 outputs the detection result to the control unit 9 as a length detection signal.

Specific configurations of the positive electrode detection unit 171 and the negative electrode detection unit 172 are not limited. For example, the positive detection unit 171, the rotation amount of the positive electrode roll R _1, the transport distance of the cathode 21 in the cathode conveying unit 31, based on the conveying speed of the cathode 21 in the cathode transport unit 31, fed from the cathode roll R ₁ The length from the tip of the positive electrode 21 may be detected. Further, the positive electrode detection unit 171 has a length from the tip of the positive electrode 21 based on a plurality of parameters such as a change in the diameter of the positive electrode roll R ₁ , a conveyance distance in the positive electrode conveyance unit 31, and a conveyance speed in the positive electrode conveyance unit 31. May be detected. The same applies to the negative electrode detection unit 172.

  The control unit 9 performs overall control of the winding machine 1 and includes, for example, a microcomputer including a microprocessor and a memory. As shown in FIG. 5, the control unit 9 stores the position of the electrode 2 in the winding axis direction in the electrode body 23 formed by winding the electrode 2 and the separator 4, for example, stored in a memory or the like. As a result, a position control unit 91, a curvature detection unit 92, and a speed control unit 93 are functionally provided. Moreover, the control part 9 of this embodiment is also provided with the winding amount measurement part 96 functionally by the said deviation suppression program being executed. Specifically, the control unit 9 includes the position adjustment unit 8 (specifically, the positive electrode adjustment unit 81, the negative electrode adjustment unit 82, and the separator adjustment unit 83) and each roll adjustment unit 132 (hereinafter simply referred to as “adjustment units 81 to 83,” A position control unit 91 that controls the bending amount of the electrode 2, and a speed control unit 93 that adjusts (controls) the conveyance speed of the electrode 2 and the separator 4. Prepare. Details are as follows.

  The position control unit 91 outputs an instruction signal to each of the adjustment units 81 to 83 and 132 based on the sensor detection signal from the sensor unit 7. Thereby, the position control part 91 controls the adjustment width | variety (movement distance) to the transversal direction of the electrode 2 or the separator 4 in each adjustment part 81-83,132. The position control unit 91 includes first to fifth position control units 911 to 915.

  Based on the sensor detection signal from the first sensor unit 71, the first position control unit 911 adjusts the positive electrode 21 that is adjusted by the positive electrode adjustment unit 81 with respect to the positive electrode adjustment unit 81 corresponding to the first sensor unit 71. The distance in the short direction (the distance corresponding to the shift in the short direction from the transport path of the positive electrode 21 at the detection position in the first sensor unit 71) is output as an instruction signal.

The second position control unit 912 is from a first sensor unit 71 corresponding to the positive electrode supply unit 13 (in the example of the present embodiment, the first sensor unit closest to the positive electrode supply unit 13 in the transport path of the positive electrode transport unit 31). Based on this sensor detection signal, the distance in the central axis direction of the positive electrode roll R ₁ that is moved (retreated) by the roll adjustment unit 132 is output as an instruction signal to the roll adjustment unit 132 of the positive electrode supply unit 13.

  Based on the sensor detection signal from the second sensor unit 72, the third position control unit 913 adjusts the negative electrode 22 adjusted by the negative electrode adjustment unit 82 to the negative electrode adjustment unit 82 corresponding to the second sensor unit 72. The distance in the short direction (the distance corresponding to the shift in the short direction from the conveyance path of the negative electrode 22 at the detection position in the second sensor unit 72) is output as an instruction signal.

The fourth position control unit 914 starts from a second sensor unit 72 corresponding to the negative electrode supply unit 14 (in the example of the present embodiment, the second sensor unit closest to the negative electrode supply unit 14 in the transport path of the negative electrode transport unit 32). based on the sensor detection signal, with respect to the roll adjustment part 132 of the negative electrode supply unit 14, and outputs moved by the roll adjustment part 132 a distance (forward and backward is to) the center axis of the anode roll R ₂ as an instruction signal.

  The fifth position control unit 915 is configured to adjust the separator adjustment unit 83 corresponding to the third sensor unit 73 based on the sensor detection signal from the third sensor unit 73 by the separator adjustment unit 83. The distance in the short direction 42 (the distance corresponding to the shift in the short direction from the transport path of the separators 41 and 42 at the detection position in the third sensor unit 73) is output as an instruction signal.

  The bending detection unit 92 detects a bending amount (hereinafter also simply referred to as “bending amount”) of the electrode 2 in the short direction with respect to the longitudinal direction based on a sensor detection signal from the sensor unit 7. The curvature detection unit 92 includes first and second curvature detection units 921 and 922. Here, the amount of bending of the electrode 2 detected by the bending detecting unit 92 is the bending in the short direction with respect to the longitudinal direction of the electrode 2, that is, the longitudinal direction and the short direction of the electrode 2 as shown in FIG. The degree of bending (bending amount) along the surface including For example, two reference points (see triangles in FIG. 6) are provided at a predetermined interval on the edge 20, and the distance β between the center position of the line α and the edge 20 with respect to the line α connecting the two reference points, The bending amount of the electrode 2 may be used, and the curvature of the edge 20 of the electrode 2 may be used as the bending amount. Note that, in FIG. 6, in order to explain the bending of the electrode 2, the amount of bending is exaggerated than the actual bending of the electrode 2.

  The first bending detection unit 921 detects the bending amount in the positive electrode 21 based on the sensor detection signal from the first sensor unit 71. Specifically, the first curvature detection unit 921 changes the position of one edge in the short direction of the positive electrode 21 being detected detected by the first sensor unit 71 at the detection position of the positive electrode 21 by the first sensor unit 71. From this, the bending amount of the positive electrode 21 is obtained. Then, the first curve detection unit 921 outputs the calculated curve amount to the speed control unit 93 as an output signal. The first curvature detection unit 921 of the present embodiment uses the sensor detection signal from at least one first sensor unit 71 among the plurality of first sensor units 71 to calculate the amount of curvature at each position in the longitudinal direction of the positive electrode 21. Although it calculates | requires respectively, it is not limited to this structure. The first bending detection unit 921 may be configured to obtain the bending amount of the positive electrode 21 at the detection position in each first sensor unit 71 using the sensor detection signal from each first sensor unit 71.

  The second bending detection unit 922 detects the bending amount in the negative electrode 22 based on the sensor detection signal from the second sensor unit 72. Specifically, similarly to the first curvature detection unit 921, the second curvature detection unit 922 obtains the curvature amount of the negative electrode 22 from the position change of one edge in the short direction of the negative electrode 22 being conveyed. The bending amount is output to the speed control unit 93 as an output signal. The first bending detection unit 921 of the present embodiment uses the sensor detection signal from at least one second sensor unit 72 among the plurality of second sensor units 72 to calculate the amount of bending at each position in the longitudinal direction of the negative electrode 22. Although it calculates | requires respectively, it is not limited to this structure. The second bending detection unit 922 may be configured to obtain the bending amount of the negative electrode 22 at the detection position in each second sensor unit 72 using the sensor detection signal from each second sensor unit 72.

Based on the length detection signal from the detection unit 17 and the output signal from the curvature detection unit 92, the speed control unit 93 performs the conveyance speed of the electrode 2 in the electrode conveyance unit 3 and the conveyance speed of the separator 4 in the separator conveyance unit 5. Is controlled (adjusted). The speed control unit 93 controls the transport speed of the electrode 2 in the electrode transport unit 3 when the part (tip part) including the tip in the electrode 2 is sent out from the rolls R ₁ and R ₂ arranged in the supply unit. A late control unit 95 that controls the transport speed of the electrode 2 in the electrode transport unit 3 when the remaining part of the electrode 2 excluding the tip part is sent out from the roll based on the detection result of the unit 94 and the detection unit 17; Have The speed controller 93 increases the conveying speed of the electrodes after the tip portion is fed from the rolls R ₁ and R ₂ . In other words, the speed control unit 93 keeps the transport speed (the transport speed when the tip portion of the electrode 2 is transported: initial speed) low (reduced) and is controlled by the late control unit 95. The transport speed (the transport speed of the electrode 2 after the tip portion is transported) is increased to the normal speed. Specifically, it is as follows.

Based on the length detection signal from the detection unit 17, the first-stage control unit 94 moves each of the transfer units (the positive electrode transfer unit 31, the negative electrode transfer unit 32, while the tip portion of the electrode 2 is being transferred by the electrode transfer unit 3. The conveyance speed in the 1st conveyance part 51 and the 2nd conveyance part 52) is controlled. For details, previous period control unit 94, when the site containing the tip of the cathode 21 (the distal end portion of the cathode 21) is sent out from the cathode roll R _1, and, a portion including the leading edge in the anode 22 (the distal end portion of the anode 22) when delivered from the anode roll R _2, of at least one, it controls the conveying speed of each conveying portion (positive electrode conveyance unit 31, the negative electrode conveyance section 32, first transport section 51 and the second conveyance unit 52,). The first-stage control unit 94 controls the transport units 31, 32, 51, and 52 so that the electrode 2 and the separator 4 are transported at an initial speed (a constant speed set in advance: a speed smaller than a set speed described later). To do. That is, the first control unit 94 operates each of the transport units 31, 32, 51, 52 in the low speed transport mode. Thus, the distal end portion of the electrode 2, the winding unit 6, compared to the rest of the site (each role (parts except for the distal end portion of the positive electrode roll R _1, the electrode 2 constituting an anode roll R _2)), Wound at low speed. At this time, the tip portion is supplied to the winding unit 6 with a predetermined (constant) tension, and is wound in a state where the tension is applied.

Moreover, late controller 95, the remaining sites in the cathode 21 (a portion excluding the front end portion of the cathode in the cathode 21 constituting the positive electrode roll R ₁₎ is fed from the positive electrode roll R _1, and the rest in the anode 22 when site (site excluding the distal end portion of the negative electrode in the anode 22 constituting the negative electrode roll _{R 2)} is sent out from the negative electrode roll _{R 2} of the control of the conveying speed of each conveying portion 31,32,51,52 To do. The late control unit 95 controls each of the transport units 31, 32, 51, and 52 so that the electrode 2 and the separator 4 are transported at a set speed (a predetermined constant speed that is higher than the initial speed). Control. That is, the late control unit 95 operates each of the transport units 31, 32, 51, and 52 in the normal transport mode. The latter-stage control unit 95 of the present embodiment detects each conveyance unit 31 when a portion with a large bending amount is detected in the positive electrode 21 or the negative electrode 22 based on detection signals from the first sensor unit 71 and the second sensor unit 72. , 32, 51, 52 are decreased. That is, the late control part 95 operates each conveyance part 31, 32, 51, 52 in a low-speed conveyance mode, when a site | part with a large curvature amount is detected. Specifically, the late control unit 95 normally operates each of the transport units 31, 32, 51, 52 in the normal transport mode, and each of the transport units 31, 32, 51, 52 when the bending amount exceeds a predetermined size. The transfer mode is switched from the normal transfer mode to the low-speed transfer mode. The latter control unit 95, the diameter and rotational amount of the positive electrode roll R ₁ and the negative electrode roll R _2, conveying distance of the electrodes 2 of the electrode conveying unit 3 and the conveying distance of the electrodes 2 calculated from the conveying speed and the like (hereinafter, " When the total carry-out distance "becomes a predetermined value (a preset value), the transfer mode of each of the transfer units 31, 32, 51, 52 is returned (switched) from the low-speed transfer mode to the normal transfer mode. .

Here, the tip part of the positive electrode 21 is a part including the tip of the positive electrode 21 and is a part obtained by combining the following first part and second part. The tip portion usually has a length sufficiently larger than the length of the transport path of the positive electrode 21 from the positive electrode roll R ₁ disposed in the positive electrode supply unit 13 to the winding shaft 61 of the winding unit 6. The length of the tip portion is preferably the cathode 21 than at least 0.6% of its length fed from the positive electrode roll R _1. Thereby, even in an electrode body formed by winding the tip portion of the positive electrode 21 (a portion that is highly likely to be curved), the displacement of the position of the positive electrode 21 in the direction of the winding axis 61 can be reliably suppressed. it can. Details are as follows.

As will be described later, the amount of curvature of the positive electrode 21 constituting the roll R ₁ increases as the portion is closer to the outer peripheral surface of the roll R _{1 due to} heat applied during the manufacture of the positive electrode 21. And in the positive electrode 21 for forming the electrode body of the electrical storage element 100 (see FIG. 8), the bending amount is such that the position adjustment in the short direction of the positive electrode 21 by the electrode adjustment unit 80 in the winding machine 1 cannot follow. big sites are usually sites within 0.6% of the total length from the tip of the cathode 21 constituting the roll R _1. For this reason, by setting the length of the tip portion to 0.6% or more, even in the electrode body formed by winding the tip portion that is highly likely to be largely curved in the positive electrode 21, The displacement of the position of the positive electrode 21 in the direction of the winding shaft 61 is reliably suppressed.

  The first portion is a portion having a predetermined length from the tip of the positive electrode 21 and is a portion having a large amount of bending due to the manufacturing method of the positive electrode 21 (that is, a portion having a bending amount equal to or larger than a predetermined size). . This portion with a large bending amount is generated for the following reason.

In the vacuum drying, which is one of the manufacturing steps of the positive electrode 21, the metal foil 211 (see FIG. 2) constituting the positive electrode 21 is extended by heat. At this time, in the positive electrode 21, the elongation rate is different between a portion where the positive electrode active material layer 212 is formed and a portion where the positive electrode active material layer 212 is not formed. Moreover, although the positive electrode 21 wound from the inner peripheral surface of the positive electrode roll R ₁ toward the outer peripheral surface tends to be unwound by the elongation, the end portion of the positive electrode 21 on the outer peripheral surface of the positive electrode roll R ₁ during vacuum drying. Since the (tip) is fixed, the closer the outer peripheral surface of the positive electrode roll R ₁ is, the greater the force applied to the unwinding force is accumulated. As a result, in the positive electrode roll R ₁ , the first portion of the positive electrode 21 is greatly curved with the side end portion not coated with the active material inward, that is, the amount of bending is increased. In the manufacturing process of the positive electrode 21, the positive electrode 21 may be bent even during roll press.

  The “predetermined size” in the “part where the bending amount is not less than a predetermined size” will be described later.

Second portion, after the first portion has been fed out from the positive electrode roll R _1, from the end of the first portion when said first portion has finished wound by winding part 6 (the end of the tip opposite) it is the site to the positive electrode roll R _1.

  The late control unit 95 of the present embodiment includes first to third speed control units 931 to 933.

The first speed control unit 931 controls (adjusts) the conveyance speed of the positive electrode 21 in the positive electrode conveyance unit 31 based on the output signal from the first curvature detection unit 921. Specifically, the first speed control unit 931 controls the positive electrode transport unit 31 so that the positive electrode 21 is transported at a constant speed (set speed). The first speed control unit 931 sets the conveyance speed of the positive electrode 21 in the positive electrode conveyance unit 31 when the amount of bending in the input output signal is equal to or greater than a predetermined amount (a predetermined amount of bending amount). Make it smaller than the speed. That is, the first speed control unit 931 switches the transport mode of the positive electrode transport unit 31 from the normal transport mode to the low speed transport mode in which the positive electrode 21 is transported at a transport speed smaller than the normal transport mode. Subsequently, the first speed control unit 931, from the time of switching from the normal transport mode to the low-speed feed mode, the total discharge distance (diameter and rotational amount of the positive electrode roll R ₁ of the cathode 21, the cathode 21 in the cathode conveying portion 31 When the positive electrode 21 is sent out from the positive electrode roll R ₁ until the positive electrode 21 conveyance distance calculated from the conveyance distance and the conveyance speed reaches the predetermined value, the conveyance speed of the positive electrode 21 in the positive electrode conveyance unit 31 is returned to the set speed. That is, the first speed control unit 931 switches the transport mode of the positive electrode transport unit 31 from the low speed transport mode to the normal transport mode in which the positive electrode 21 is transported at a transport speed larger than the low speed transport mode.

The second speed control unit 932 controls (adjusts) the conveyance speed of the negative electrode 22 in the negative electrode conveyance unit 32 based on the output signal from the second curvature detection unit 922. Specifically, the second speed control unit 932 controls the negative electrode transport unit 32 so that the negative electrode 22 is transported at a constant speed (the set speed). The second speed control unit 932 of the present embodiment controls the negative electrode transport unit 32 so that the negative electrode 22 is transported at the same speed (set speed) as the transport speed of the positive electrode 21 in the positive electrode transport unit 31. The second speed control unit 932 sets the conveyance speed of the negative electrode 22 in the negative electrode conveyance unit 32 from the set speed when the bending amount in the input output signal is equal to or larger than a predetermined magnitude (a predetermined bending quantity). Make it smaller. That is, the second speed control unit 932 switches the transport mode of the negative electrode transport unit 32 from the normal transport mode to the low speed transport mode. Subsequently, the second speed control unit 932, from the time of switching from the normal transport mode to the low-speed feed mode, the total discharge distance of the anode 22 (the anode roll R ₂ in diameter and the rotation amount, the negative electrode 22 at the negative electrode conveyance section 32 When the negative electrode 22 to the transport distance) becomes a predetermined value of the anode 22 which is calculated from the conveyance distance and the conveying speed or the like is fed from the anode roll R _2, returns the conveying speed of the negative electrodes 22 in the negative electrode conveyance section 32 to the set speed. That is, the second speed control unit 932 switches the transport mode of the negative electrode transport unit 32 from the low speed transport mode to the normal transport mode.

  Here, the “predetermined size” that is the threshold value at which the first and second speed control units 931 and 932 switch the transport modes of the positive electrode transport unit 31 and the negative electrode transport unit 32 is that the positive electrode 21 and the negative electrode 22 are set speeds. When the position of the positive electrode 21 or the negative electrode 22 is shifted in the short direction due to bending in the conveyed state, the positive electrode adjustment unit 81 or the negative electrode adjustment unit 82 cannot follow this shift (that is, the positive electrode 21 This is the minimum value of the range of curvature amount.

  In the first speed control unit 931 and the second speed control unit 932 described above, when the first speed control unit 931 switches the transport mode of the positive electrode transport unit 31, the second speed control unit 932 also transports the negative electrode transport unit 32. The mode is switched to be the same as the transport mode of the positive electrode transport unit 31. In addition, when the second speed control unit 932 switches the transport mode of the negative electrode transport unit 32, the first speed control unit 931 also causes the transport mode of the positive electrode transport unit 31 to be the same as the transport mode of the negative electrode transport unit 32. Switch.

  The third speed control unit 933 controls (adjusts) the transport speed of the separator 4 in the separator transport unit 5. Specifically, the third speed control unit 933 controls the first transport unit 51 and the second transport unit 52 so that the separators 41 and 42 are transported at a set speed. That is, the third speed control unit 933 moves the first transport unit 51 and the second transport unit 52 so that the separators 41 and 42 are transported at the same speed (set speed) as the transport speed of the positive electrode 21 in the positive electrode transport unit 31. Control. Further, when the transport mode of the electrode transport unit 3 (the positive electrode transport unit 31 and the negative electrode transport unit 32) is switched, the third speed control unit 933 simultaneously sets the transport mode of the first transport unit 51 and the second transport unit 52. It switches so that it may become the same as the conveyance mode of the electrode conveyance part 3. FIG.

  As described above, the electrode transport unit 3 and the separator transport unit 5 are switched at the same timing so as to be in the same transport mode, so that the positive electrode 21, the negative electrode 22, and the separators 41 and 42 with respect to the winding unit 6. Are fed at the same rate.

  Based on the winding signal from the winding unit 6, the winding amount measuring unit 96 sets the windings of the electrode 2 (the positive electrode 21 and the negative electrode 22) and the separator 4 (the first separator 41 and the second separator 42) in the winding unit 6. When the amount of rotation is measured and it is detected that the electrode 2 and the separator 4 having a predetermined length have been wound (taken up by the winding shaft 61), a stop signal is output to the speed controller 93 and the like.

  In the winding machine 1 configured as described above, the electrode 2 and the separator 4 are wound as shown in FIG.

A positive electrode roll R ₁ , a negative electrode roll R ₂ , a first roll R _3, and a second roll R ₄ are arranged in the supply unit 10. The positive electrode 21, the negative electrode 22, the first separator 41, and the second separator 42 drawn out from the rolls R ₁ , R ₂ , R ₃ , R ₄ are on the transport path in the transport units 31, 32, 51, 52. Is arranged (see FIG. 1). At this time, a cylindrical winding core is attached to the winding shaft 61 of the winding unit 6. In this state, the control unit 9 rotates the winding shaft 61 of the winding unit 6 and rotates the rotation shafts 131 of the supply units 13 to 16 respectively. In addition, the control unit 9 rotates the winding shaft 61 and the respective rotation shafts 131 and simultaneously operates the respective conveyance units 31, 32, 51, and 52 (Step S1). Thereby, the positive electrode 21, the negative electrode 22, the first separator 41, and the second separator 42 start to be wound around the winding core attached to the winding shaft 61. In addition, the winding amount measuring unit 96 of the control unit 9 is configured so that the electrode 2 (the positive electrode 21 and the negative electrode 22 in the winding unit 6 is based on the winding signal from the time when each of the transport units 31, 32, 51, 52 is operated. ) And separator 4 (first separator 41, second separator 42) start to be measured. At this time, since the tip portions of the positive electrode 21 and the negative electrode 22 are conveyed by the positive electrode conveyance unit 31 and the negative electrode conveyance unit 32, the previous control unit 94 controls the conveyance units 31, 32, 51, and 52. The detecting unit 17 (positive detection unit 171 and the negative detector 172) detects a length from the tip of the cathode 21 and anode 22 are fed from the cathode roll _{R 1} and the negative electrode roll _{R 2,} respectively.

Subsequently, the first control unit 94 includes the positive electrode 21, the negative electrode 22, the first separator 41, and the second separator 42 (hereinafter, referred to as “positive electrode conveyance unit 31”, “negative electrode conveyance unit 32”, “first conveyance unit 51”, and “second conveyance unit 52”). (Also simply referred to as “positive electrode 21 or the like”) is increased to the initial speed. Then, when the conveyance speed at each of the conveyance units 31, 32, 51, 52 increases to the initial speed, the first-term control unit 94 maintains the conveyance speed at each of the conveyance units 31, 32, 51, 52 at the initial speed ( Step S2). That is, the speed control unit 93 operates each of the transport units 31, 32, 51, and 52 in the low speed transport mode. Thus, the conveying speed (the initial rate of the electrode 2 when the most likely to have curved in the electrode 2 (cathode 21 and anode 22) site (distal end portion) is sent out from the cathode roll R ₁ and the negative electrode roll R ₂ ) Smaller than the set speed, the position of the electrode 2 in the short direction by the positive electrode adjustment unit 81 and the negative electrode adjustment unit 82 when the electrode 2 being conveyed is displaced in the short direction due to the curvature. This prevents the adjustment from following the deviation.

  While the positive electrode 21 and the like are being conveyed in each of the conveyance units 31, 32, 51, and 52, the sensor unit 7 (first to third sensor units 71, 72, and 73) is positioned in the short direction of the positive electrode 21 and the like. Continue to detect each.

  The first to fifth position control units 911 to 915 control the adjustment units 81, 82, 83, 132 based on the sensor detection signals from the sensor units 71, 72, 73, and the positive electrode 21 in each conveyance path. Adjust the position in the short direction. Specifically, each of the position control units 911 to 915 adjusts each of the adjustment units 81, 82, 83, and 132 when the positive electrode 21 or the like deviates from the conveyance path in the short direction in each of the conveyance units 31, 32, 51, 52. Is operated to adjust the position of the positive electrode 21 and the like in the short direction and return to the transport path. Thus, in the winding machine 1, while the positive electrode 21 or the like is being transported, the positive electrode 21, the negative electrode 22, the first separator 41, and the second separator 42 are based on the detection results of the sensor units 71, 72, and 73. The position in the short direction continues to be adjusted.

  When the belt-like positive electrode 21 or the like is conveyed at a high speed by the plurality of conveyance rollers 311, the positional deviation in the short direction of the positive electrode 21 or the like may occur in the conveyance path regardless of the curvature of the positive electrode 21 or the like. The deviation is corrected by adjusting the position in the short direction.

Based on the length detection signal from the detection unit 17, the control unit 9 determines that at least one tip portion of the positive electrode 21 and the negative electrode 22 has been sent from each of the rolls R ₁ and R ₂ (step S3: Yes), that is, If it is determined that at least one first part (part of a predetermined length) of the positive electrode 21 and the negative electrode 22 is wound at a low speed in the winding part 6, the speed control of each of the transport paths 31, 32, 51, 52 is performed in the previous period. The control by the control unit 94 is switched to the control by the late control unit 95. Thereby, the conveyance speed of the positive electrode 21 etc. in each conveyance part 31, 32, 51, 52 becomes larger than an initial speed. That is, the transfer mode of each transfer unit 31, 32, 51, 52 is switched from the low-speed transfer mode to the normal transfer mode (step S4). At this time, the control unit 9 outputs a rotation speed signal toward the winding unit 6 so as to increase the winding speed in the winding unit 6 according to the increase in the conveyance speed of the positive electrode 21 and the like. That is, the control unit 9 increases the rotation speed of the winding shaft 61 of the winding unit 6. Note that while the electrode 2 is being transported in the low-speed transport mode, the first portion (a portion having a predetermined length) of the electrode 2 is wound around the winding portion 6 with a predetermined tension applied.

  Even after switching to the control by the late control unit 95, the position control units 911 to 915 control the adjustment units 81, 82, 83, and 132 based on the detection results of the sensor units 71, 72, and 73. The position adjustment of the positive electrode 21 and the like in the short direction is continued.

On the other hand, when the control unit 9 determines that the tip portions of both the positive electrode 21 and the negative electrode 22 are not yet sent out from the rolls R ₁ and R ₂ (step S3: No), the winding machine 1 Returning to step S2, the winding operation of the electrode 2 and the like in the low-speed transport mode is continued. That is, the control unit 94 continues to control the transport units 31, 32, 51, 52.

  After the control of each transport unit 31, 32, 51, 52 is switched from the first-stage control unit to the second-stage control, the winding amount measuring unit 96 indicates that the positive electrode 21 or the like having a predetermined length is wound in the winding unit 6. When the determination is made (step S5: Yes), that is, when it is detected that the positive electrode 21 or the like having a predetermined length has been wound, a stop signal is output and the winding operation of the positive electrode 21 or the like in the winding machine 1 is stopped. (Step S12). On the other hand, if the winding amount measuring unit 96 determines that the positive electrode 21 or the like having a predetermined length is not wound in the winding unit 6 (step S5: No), that is, the positive electrode 21 or the like having a predetermined length is If it is not detected that the winding has been performed, no stop signal is output. For this reason, the winding machine 1 continues the winding operation of the positive electrode 21 and the like.

  Further, when the control of each of the transport units 31, 32, 51, 52 is switched from the first control unit to the second control, the curve detection unit 92 is based on the detection results of the first sensor unit 71 and the second sensor unit 72. The bending amount (bending amount) at each position in the longitudinal direction of the positive electrode 21 and the negative electrode 22 is started.

  After the switching to the normal conveyance mode, the bending detection unit 92 determines that the detected bending amount (the bending amount of at least one of the positive electrode 21 and the negative electrode 22) is not less than a predetermined size (step S6: No). The 1st-3rd speed control parts 931-933 control each conveyance part 31,32,51,52, and make conveyance speeds, such as positive electrode 21, smaller than setting speed. The first to third speed control units 931 to 933 of the present embodiment lower the transport speed of the positive electrode 21 and the like from the set speed to the initial speed. That is, the first to third speed control units 931 to 933 switch the transport mode of each of the transport units 31, 32, 51, and 52 from the normal transport mode to the low speed transport mode (step S7). At this time, the control unit 9 outputs a rotation speed signal toward the winding unit 6 so as to reduce the winding speed in the winding unit 6 in accordance with the decrease in the conveyance speed of the positive electrode 21 and the like. That is, the control unit 9 decreases the rotation speed of the winding shaft 61 of the winding unit 6. Even during the low-speed conveyance mode, the position control units 911 to 915 control the adjustment units 81, 82, 83, and 132 based on the detection results of the sensor units 71, 72, and 73, and the positive electrode 21 and the like. Continue position adjustment in the short direction.

  As described above, when the transport mode is switched to the low speed transport mode, the “curvature” often deviates more than the “positional deviation in the short direction caused by the transport (that is, regardless of the curvature)” by the transport rollers 311 and 321. Even if the “positional displacement due to the” occurs, the positional adjustment of the positive electrode 21 and the negative electrode 22 in the short direction by the positive electrode adjustment unit 81 and the negative electrode adjustment unit 82 can be prevented from being unable to follow the displacement.

  On the other hand, while the bending detection unit 92 determines that the detected bending amount is smaller than the predetermined size (less than the predetermined size) (step S6: Yes), the winding machine 1 is normally transported. Continue the winding operation of the electrode 2 etc. in the mode.

  When the winding amount measuring unit 96 determines that the positive electrode 21 or the like having a predetermined length has been wound in the winding unit 6 during operation in the low-speed conveyance mode (step S8: Yes), a stop signal is output. Then, the winding operation of the positive electrode 21 and the like in the winding machine 1 is stopped (step S12). On the other hand, if the winding amount measuring unit 96 determines that the predetermined length of the positive electrode 21 or the like is not wound in the winding unit 6 (step S8: No), it does not output a stop signal. For this reason, the winding machine 1 continues the winding operation of the positive electrode 21 and the like.

  Subsequently, from the time when the late control unit 95 starts operation in the low-speed conveyance mode, the positive electrode 21 and the negative electrode 22 are kept in contact with each other until the total carry-out distance of at least one of the positive electrode 21 and the negative electrode 22 reaches a predetermined value (a preset value). When it is determined that the rolls R1 and R2 have been fed (step S9: Yes), the first to third speed control units 931 to 933 change the transport mode of each of the transport units 31, 32, 51, and 52 from the low speed transport mode to the normal mode. Switching to the transport mode (step S10) That is, the first to third speed control units 931 to 933 increase the transport speed of the positive electrode 21 and the like in each of the transport units 31, 32, 51, and 52 to a set speed. At this time, the control unit 9 outputs a rotation number signal toward the winding unit 6 so that the winding speed in the winding unit 6 is also increased with the increase in the conveyance speed.

  On the other hand, while the late control unit 95 determines that the total transport distance of either the positive electrode 21 or the negative electrode 22 is not a predetermined value from the start of operation in the low-speed transport mode (step S9: No), The winding machine 1 continues the winding operation of the positive electrode 21 and the like in the low-speed conveyance mode.

As described above, the control unit 9 normally transports each of the transport units 31, 32, 51, and 52 by the first to third speed control units 931 to 933 (in a state where the bending amount is smaller than a predetermined size). Operate in mode. Then, when a bending amount of a predetermined size or more is detected, the control unit 9 thereafter feeds the electrodes 2 from the rolls R ₁ and R ₂ until the total carry-out distance reaches a predetermined value. 31, 32, 51 and 52 are operated in the low-speed transfer mode.

  After switching from the low-speed transfer mode to the normal transfer mode, the winding amount measuring unit 96 determines that the positive electrode 21 or the like having a predetermined length has been wound in the winding unit 6 during the operation in the normal transfer mode. (Step S11: Yes) and a stop signal are output and the winding operation of the positive electrode 21 etc. in the winding machine 1 is stopped (step S12). On the other hand, when the winding amount measuring unit 96 determines that the positive electrode 21 or the like having a predetermined length has not been wound in the winding unit 6 (step S11: No), the winding machine 1 returns to step S6, The winding operation of the positive electrode 21 and the like in the normal transport mode is continued while detecting the bending amount.

  When it is determined by the winding amount measuring unit 96 that the positive electrode 21 or the like having a predetermined length has been wound in the winding unit 6, the control unit 9 controls each of the transport units 31, 32, 51, 52 and each supply unit. 13-16 and the winding part 6 are stopped (step S12). Subsequently, in the winding unit 6, the positive electrode 21, the negative electrode 22, and the separators 41 and 42 are cut (step S13), and the electrode body 23 is completed.

  By incorporating the electrode body 23 thus manufactured in the case, a power storage device 100 such as a non-aqueous electrolyte secondary battery as shown in FIG. 8 is formed. The storage element 100 includes an electrode body 23, a case 103 that houses the electrode body 23, an external terminal 104 that is disposed outside the case 103, and the like. In addition, the storage element 100 includes a current collector or the like for electrically connecting the electrode body 23 and the external terminal 104 inside the case 103.

  In the winding machine 1, when the completed electrode body 23 (the positive electrode 21 or the like having a predetermined length is wound) is removed from the winding shaft 61, the winding core is attached to the winding shaft 61 again. After that, the winding of the positive electrode 21, the negative electrode 22, and the separators 41 and 42 around the winding core by the winding shaft 61 starts and the process returns to step S5. At this time, the speed control unit 93 controls the transport units 31, 32, 51, 52 by the late control unit 95.

In each step, when the positive electrode roll R ₁ or the negative electrode roll R ₂ in the supply unit 10 is exhausted, the winding machine 1 temporarily stops. When a new positive electrode roll R ₁ or negative electrode roll R ₂ is located in the supply unit 10, winding machine 1 starts to operate the process returns to step S1. That is, each of the transport units 31, 32, 51, 52 is controlled by the first control unit 94 of the speed control unit 93 in a state where at least one of the tip portions of the positive electrode 21 and the negative electrode 22 is transported. In a state where a part other than the part (remaining part) is being transported and a part other than the tip part of the negative electrode 22 (remaining part) is being transported, it is controlled by the late control unit 95 of the speed control unit 93.

According to the winding machine 1 described above, in order to improve the production efficiency of the electrode body 23, the electrode 2 (in detail, even if the conveyance speed (set speed) when the electrode 2 is normally conveyed is set high) In the positive electrode 21 and the negative electrode 22), the conveyance speed of the electrode 2 is increased after the highly curved portion (tip portion) is fed from the rolls R ₁ and R ₂ , that is, the tip portion is conveyed. At this time, the conveyance speed (initial speed) is kept low (decreased), and the conveyance speed of the electrode is increased to the normal speed after the tip portion is conveyed. Thereby, in the winding machine 1, when the shift | offset | difference to the transversal direction resulting from the said curvature arises in the electrode 2 in conveyance, by the electrode adjustment part 80 (specifically, the positive electrode adjustment part 81 and the negative electrode adjustment part 82). This prevents the position adjustment of the electrode 2 in the short direction from being unable to follow the shift. For this reason, also in the electrode body 23 formed by winding the tip part of the electrode 2 (part highly likely to be curved), the displacement of the position of the electrode 2 in the winding axis direction can be suppressed.

  Moreover, in the winding machine 1 of the present embodiment, when the amount of bending exceeds a predetermined value (predetermined size) during the conveyance of the portion (intermediate position) excluding the tip portion of the electrode 2, the electrode 2 is conveyed. Even if the electrode 2 to be transported includes a curved portion in the middle position by simple control such as reducing the speed (that is, switching the transport mode), the electrode body 23 formed in the winding unit 6 The displacement of the position of the electrode 2 in the winding axis direction is suitably suppressed.

  In the winding machine 1 of the present embodiment, a plurality of electrode adjustment units 80 (specifically, the positive electrode adjustment unit 81 and the negative electrode adjustment unit 82) are provided along the conveyance path of the electrode 2. For this reason, the position of the electrode 2 being transported in the short direction is adjusted at a plurality of positions on the transport path, thereby shifting the position of the electrode 2 supplied (conveyed) to the winding unit 6 in the short direction. Is more suppressed. As a result, the displacement of the position of the electrode 2 in the winding axis direction in the formed electrode body 23 is more preferably suppressed.

  Moreover, in the winding machine 1 of this embodiment, the shift | offset | difference of the position of the short direction of the electrode 2 detected by the 1st sensor part 71 and the 2nd sensor part 72 is used for this 1st sensor part 71 and this 2nd sensor. The positive electrode adjustment unit 81 and the negative electrode adjustment unit 82 corresponding to the unit 72 adjust. For this reason, the accuracy of the position adjustment of the electrode 2 at each adjustment position (the position where each positive electrode adjustment unit 81 and each negative electrode adjustment unit 82 adjust the position of the positive electrode 21 and the negative electrode 22 in the short direction) is improved. Thereby, the shift | offset | difference of the position of the winding axis direction in the electrode body 23 formed in the winding part 6 is suppressed more effectively.

  Further, in the winding machine 1 of this embodiment, the electrode supply unit 11 (specifically, the positive electrode supply unit 13 and the negative electrode supply unit 14) drives the rotary shaft 131 in the axial direction of the rotary shaft 131. 132 respectively. For this reason, also in the delivery position of the electrode 2 (specifically, the positive electrode 21 and the negative electrode 22) in the electrode supply unit 11, the position of the electrode 2 in the short direction is adjusted. Thereby, the shift | offset | difference of the position of the electrode 2 of the winding axis direction in the electrode body 23 formed of the winding part 6 is suppressed more.

  Note that the winding machine and the electrode winding method of the present invention are not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

  In the winding machine 1, the specific control of the conveyance speed of the positive electrode 21 and the like in the normal conveyance mode is not limited. That is, in the normal transport mode in the winding machine 1 of the above embodiment, the transport speed of the positive electrode 21 and the like is constant, but is not limited thereto, and the transport speed of the positive electrode 21 and the like may be changed. For example, the winding machine 1 is provided with a sensor unit capable of detecting variable elements other than the position in the short direction of the electrode 2 being conveyed, and the conveyance speed of the electrode 2 and the like based on the detection result of the sensor unit Feedback control or the like may be performed.

  Further, the latter-stage control unit 95 of the winding machine 1 of the above embodiment moves the positive electrode 21 and the like at a predetermined speed (low-speed conveyance mode) lower than the set speed when the detected amount of bending exceeds a predetermined magnitude. After the positive electrode 21 and the like are sent out from the supply unit 10 by the total carry-out distance from the time when they are transferred to the low-speed transfer mode, the transfer mode is switched and the positive electrode 21 and the like are transferred at a set speed (normal transfer mode). It is not limited to this configuration. For example, the late control unit 95 may be configured such that the transport speed of the positive electrode 21 or the like changes based on the detected amount of bending. Specifically, the late control unit 95 may be configured to reduce the transport speed of the positive electrode 21 and the like as the detected amount of bending increases. In this case, the late control unit 95 increases the conveyance speed of the positive electrode 21 and the like as the detected amount of bending decreases.

  According to such a configuration, a portion with a larger amount of bending is transported at a lower transport speed, so that when the electrode 2 being transported shifts in the lateral direction due to the bending, the electrode adjusting unit 80 It is possible to more reliably prevent the position adjustment in the short direction of the electrode from being followed.

  Further, when the late control unit 95 determines that the bending amount of the electrode 2 is not less than a predetermined size (that is, not less than the predetermined size), this determination result is obtained when the determination result is obtained. In this configuration, the electrode body 23 is not formed in the wound part 6 (wound) but is reflected when the positive electrode 21 or the like is wound on the electrode body 23 formed next to the electrode body 23. Also good. That is, the late control unit 95 continues to convey the positive electrode 21 and the like to the winding unit 6 in the normal conveyance mode even when the bending amount of the predetermined size or more is detected, and the bending amount of the predetermined size or more is maintained. When forming the electrode body 23 that is formed next to the electrode body 23 that has been formed in the winding part 6 when it is detected, the electrode 2 is moved in the low-speed transport mode from the beginning (beginning) to the end (end of winding). The structure conveyed to the winding part 6 may be sufficient. According to such a configuration, the tension applied to the positive electrode 21 or the like when the positive electrode 21 or the like is supplied to the winding unit 6 from the beginning to the end of the winding of the positive electrode 21 or the like in the winding unit 6, and the positive electrode 21. Therefore, the quality of the formed electrode body 23 is further improved.

  In the winding machine 1 of the above-described embodiment, the conveyance speed at the time of conveying the tip portion, and a portion with a large bending amount in the portion (other portion) excluding the tip portion of the electrode 2 (the amount of bending is equal to or larger than a predetermined size) ) Is the same as the conveying speed when conveying the part), but may be different. That is, in the winding machine 1, the speed at which the other part is transported may be larger or smaller than the speed at which the tip part is transported.

  In the winding machine 1 of the said embodiment, when neither front-end | tip part of the positive electrode 21 and the negative electrode 22 is conveyed in the positive electrode conveyance part 31 and the negative electrode conveyance part 32, in each position of the positive electrode 21 and the negative electrode 22 in the longitudinal direction This is a configuration (control) in which the amount of bending is obtained, and when the amount of bending is greater than or equal to a predetermined size, the transport mode of each of the transport units 31, 32, 51, 52 is switched to the low-speed transport mode, but is not limited to this configuration. That is, the winding machine 1 is configured so that the transport modes of the transport units 31, 32, 51, and 52 are normally transported except when at least one tip portion of the positive electrode 21 and the negative electrode 22 is transported by the transport units 31 and 32. You may comprise (control) so that it may become a mode.

  The winding unit 6 in the winding machine 1 of the above embodiment is configured such that the winding shaft 61 rotates around the axis 610 and does not move in the direction of the axis 610, but is not limited to this configuration. The winding unit 6 may include an axis adjustment unit that adjusts the position of the winding shaft 61 in the direction of the axis 610. For example, specifically, the shaft adjustment unit moves the winding shaft 61 in the direction of the axis 610 based on the detection result of the sensor unit 7 (first to third sensor units 71 to 73). Specifically, the shaft adjusting unit moves the winding shaft 61 in a state in which the positive electrode 21, the negative electrode 22, and the separators 41 and 42 are wound (that is, in a state of rotating around the axis 610) from the control unit 9. Is moved in the direction of the axis 610 based on the instruction signal. According to this configuration, in the winding unit 6, the short sides of the electrode 2 and the separator 4 that are supplied to the wound body (the electrode 2 and the separator 4 that are wound around the winding shaft 61). Since the position (relative position) in the direction is adjusted, the displacement of the positions of the electrode 2 and the separator 4 in the winding axis direction in the electrode body 23 formed by the winding part 6 is suppressed.

  The sensor units (first to third sensor units) 71 to 73 provided in the winding machine 1 according to the embodiment detect the position of one edge (edge) in the short direction of the electrode 2 or the separator 4. However, it is not limited to this configuration. For example, each of the sensor units 71 to 73 may be configured to detect the positions of both edges in the short direction like a line sensor or the like, or may be configured to acquire an image of the electrode 2 or the like like an image sensor.

  In the winding machine 1 of the above-described embodiment, the bending amount of both the positive electrode 21 and the negative electrode 22 is detected (obtained), but the configuration may be such that at least one bending amount of the positive electrode 21 and the negative electrode 22 is detected. Also with this configuration, in the electrode body 23 formed by the winding part 6, it is possible to suppress the displacement of the position of at least one of the positive electrode 21 and the negative electrode 22 in the winding axis direction.

Supply 10 of the wound machine 1 of the above embodiment, specifically, the positive electrode supply unit 13, the negative electrode supply section 14, the first supply unit 15 and the second supply unit 16, a roll R ₁ in the positive electrode 21 or the like is fed When ˜R ₄ disappears, it is a configuration in which new rolls R _{1 to} R ₄ are replenished (arranged), but is not limited to this configuration. For example, the positive electrode supply unit 13 may be configured such that when a plurality of positive electrode rolls R ₁ are arranged and one positive electrode roll R ₁ disappears, the positive electrode 21 is automatically sent out from another positive electrode roll R ₁ . Specifically, the positive electrode supply unit 13, when one of the positive electrode roll R ₁ is lost, the end of the cathode 21 in the inner peripheral surface side of the end (positive electrode roll R ₁ of the positive electrode 21 constituting the positive electrode roll R ₁ a), the end portion of the cathode 21 in the starting end (outer peripheral surface side of the cathode roll R ₁ of the positive electrode 21 constituting the other of the positive electrode roll R _1, but is connected automatically, subsequently the said one of the positive electrode roll R ₁ other from the positive electrode roll R ₁ may be configured to feed the cathode 21. other supply portion (negative electrode supply section 14, the first supply portion 15, the second supply unit 16) is also the same.

In this case, when one of the positive electrode roll R ₁ and the negative electrode roll R ₂ is replaced, the speed control unit 93 controls the transport units 31, 32, 51, 52 from the late control unit 95 in the previous period. Switching to the unit 94 (that is, the winding machine 1 returns to step S1 in the above operation flow).

  In the winding machine 1 of the said embodiment, each adjustment part (the positive electrode adjustment part 81, the negative electrode adjustment part 82, and the separator adjustment part 83) is a sensor part (1st-3rd) in conveyance paths, such as the positive electrode 21. Although it is provided in the downstream position from the detection position (sensing position) in the sensor units 71 to 73), it is not limited to this configuration. For example, each of the adjustment units 81, 82, 83 may be provided at a position upstream of the detection position by the corresponding sensor unit 71, 72, 73 in the transport path such as the positive electrode 21.

  In the winding machine 1 of the above embodiment, for example, one positive electrode adjustment unit 81 adjusts (corrects) the position of the positive electrode 21 in the short direction based on the detection result of one first sensor unit 71. It is not limited to the configuration. For example, in the winding machine, based on the detection result of at least one first sensor unit 71, a plurality of positive electrode adjustment units 81 (a number larger than the number of first sensor units 71) are positioned in the short direction of the positive electrode 21. The number of positive electrode adjustment units 81 (which is smaller than the number of first sensor units 71) is shorter than that of the positive electrode 21 based on the detection results of the plurality of first sensor units. It may be configured to correct the position in the direction.

DESCRIPTION OF SYMBOLS 1 ... Winding machine, 2 ... Electrode, 20 ... Edge, 21 ... Positive electrode, 211 ... Metal foil, 212 ... Positive electrode active material layer, 22 ... Negative electrode, 221 ... Metal foil, 222 ... Negative electrode active material layer, 23 ... Electrode body DESCRIPTION OF SYMBOLS 3 ... Electrode conveyance part, 31 ... Positive electrode conveyance part, 311 ... Conveyance roller, 32 ... Negative electrode conveyance part, 321 ... Conveyance roller, 4 ... Separator, 41 ... First separator, 42 ... Second separator, 5 ... Separator conveyance part , 51 ... 1st conveyance part, 511 ... Conveyance roller, 52 ... 2nd conveyance part, 6 ... Winding part, 61 ... Winding shaft, 610 ... Shaft core, 7 ... Sensor part, 71 ... 1st sensor part, 72 2nd sensor part 73 ... 3rd sensor part 8 ... Position adjustment part 80 ... Electrode adjustment part 81 ... Positive electrode adjustment part 811 ... Roller 812 ... Drive part 82 ... Negative electrode adjustment part 83 ... Separator adjustment 9, control unit 91, position control unit 911, first position Control unit, 912 ... second position control unit, 913 ... third position control unit, 914 ... fourth position control unit, 915 ... fifth position control unit, 92 ... curve detection unit, 921 ... first curve Detection unit, 922... Second curve detection unit, 93... Speed control unit, 931... First speed control unit, 932... Second speed control unit, 933. Control part, 10 ... supply part, 11 ... electrode supply part, 12 ... separator supply part, 13 ... positive electrode supply part, 131 ... rotating shaft, 132 ... roll adjustment part, 14 ... negative electrode supply part, 15 ... first supply part, 16 ... second supply unit, 17 ... detection unit, 171 ... positive detection unit, 172 ... negative detection unit, R 1 _... positive electrode (roll), R 2 _... negative electrode (roll), R 3 _... first roll, R ₄ ... Second roll

Claims (14)

A supply section capable of delivering the electrode from a roll of electrode strips;
An electrode transport section for transporting the electrode fed from the supply section;
A separator transport section for transporting a strip-shaped separator;
A winding part for winding the electrode and the separator conveyed by the electrode conveying part and the separator conveying part so that the separator is located between the electrodes;
A sensor unit for detecting a position of the electrode in a short direction during conveyance;
An electrode adjusting unit that adjusts the position of the electrode being conveyed in the short direction based on the detection result in the sensor unit;
A detection unit for detecting the length from the tip of the electrode sent out from the roll;
A controller that adjusts the transport speed of the electrode in the electrode transport section,
The control unit increases a transport speed of the electrode in the electrode transport unit after a tip portion including the tip in the electrode is sent out from the roll based on a detection result in the detection unit. .   The winding machine according to claim 1, wherein the length of the tip portion including the tip is at least 0.6% or more of the entire length of the electrode fed from the roll.   The detection unit is sent out from the roll based on at least one of the diameter of the roll, the rotation amount of the roll, the transport distance of the electrode in the transport unit, and the transport speed of the electrode in the transport unit. The winding machine according to claim 1 or 2, wherein a length from the tip of the electrode is detected.   The winding machine according to any one of claims 1 to 3, wherein a plurality of the electrode adjustment units are provided along a conveyance path of the electrodes. A plurality of the sensor units are provided along the transport path,
5. The winding machine according to claim 4, wherein each of the plurality of electrode adjustment units adjusts a position of the electrode in a short direction based on a detection result of a corresponding sensor unit.   The at least one electrode adjusting unit adjusts the position of the electrode in the short direction at a position downstream from the position where the sensor unit in the electrode transport path detects the position of the electrode in the short direction. The winding machine of any one of -5.   The at least one electrode adjustment part adjusts the position of the transversal direction of the electrode at a position downstream of the intermediate position of the transport path in the transport path of the electrode. Winding machine.   The supply unit rotates the roll around the central axis of the roll and can feed the electrode from the roll, and the rotation axis is based on the detection result of the sensor unit. The winding machine according to any one of claims 1 to 7, further comprising a roll adjustment unit that moves in a core direction.   The winding part rotates around the axis to wind the electrode and the separator, and the winding axis is based on the detection result of the sensor part. The winding machine according to any one of claims 1 to 8, further comprising: an axis adjustment unit that moves in a direction. The electrode includes a positive electrode and a negative electrode,
The roll includes a positive electrode roll and a negative electrode roll,
The supply unit includes a positive electrode supply unit that sends out the positive electrode from the positive electrode roll, and a negative electrode supply unit that sends out the negative electrode from the negative electrode roll,
The electrode transport unit includes a positive electrode transport unit that transports the positive electrode, and a negative electrode transport unit that transports the negative electrode.
The winding part winds the positive electrode, the negative electrode, and the separator so that the separator is positioned between the positive electrode and the negative electrode,
The sensor unit includes a positive electrode sensor unit that detects a position in a short direction of the positive electrode during conveyance, and a negative electrode sensor unit that detects a position in a short direction of the negative electrode during conveyance,
The electrode adjustment unit adjusts the position of the positive electrode in the short direction based on the detection result of the positive electrode sensor unit, and the short direction of the negative electrode based on the detection result of the negative electrode sensor unit A negative electrode adjusting part for adjusting the position of
The detection unit includes a positive electrode detection unit capable of detecting a length from the tip of the positive electrode sent out from the positive electrode roll, and a negative electrode detection unit capable of detecting a length from the tip of the negative electrode sent out from the negative electrode roll. Have
Based on the detection results of the positive electrode detection unit and the negative electrode detection unit, the control unit sends out a tip part including the tip in the positive electrode from the positive electrode roll, and a tip part including the tip in the negative electrode The winding according to any one of claims 1 to 9, wherein after feeding from the negative electrode roll, the positive electrode transport speed in the positive electrode transport section and the negative electrode transport speed in the negative electrode transport section are increased. Machine. The control unit is configured to control the tip part based on a detection result of the detection part and a control unit that controls a transport speed of the electrode in the electrode transport part when the tip part of the electrode is sent out from the roll. A late control unit that controls the electrode conveyance speed in the electrode conveyance unit when the remaining part of the electrode except the electrode is fed from the roll, and a short in the longitudinal direction of the electrode based on the detection result in the sensor unit A curvature detection unit that detects the amount of curvature in the hand direction,
The winding device according to any one of claims 1 to 10, wherein the late control unit changes a transport speed of the electrode in the electrode transport unit based on the amount of curvature detected by the curvature detection unit. .   The winding machine according to any one of claims 1 to 11, wherein the late control unit reduces the transport speed of the electrode in the electrode transport unit when the bending amount is equal to or greater than a predetermined size.   The winding machine according to any one of claims 1 to 11, wherein the late control unit decreases the transport speed of the electrode in the electrode transport unit as the amount of bending increases. An electrode winding method for winding the conveyed electrode and the separator so that the separator is positioned between the electrodes while conveying the strip-shaped separator and the electrode fed from the roll of the strip-shaped electrode. And
The position in the short direction of the electrode being transported is detected, the position in the short direction of the electrode is adjusted based on the detection result, and a portion of the electrode having a predetermined length is disposed on the outer peripheral side of the roll. A method of winding an electrode, wherein after a portion including an electrode end is fed from the roll, the conveying speed of the electrode is increased.

Images