JP2016051654A - 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: There are provided a winder and a winding method. The winder includes: a sensor section to detect a position of an electrode in a transverse direction during conveyance; an electrode adjustment section to adjust a position of the electrode in a transverse direction during conveyance, on the basis of a detection result at the sensor section; a curve detection section to detect a curvature amount in a transverse direction with respect to a longitudinal direction in an electrode during conveyance, on the basis of a detection result at the sensor section; and a speed control section to change the conveyance speed of an electrode on the basis of the curvature amount of the electrode having been detected at the curve detection section.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 winding machine according to the present invention is
An electrode transport section for transporting the belt-shaped electrode;
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 curvature detection unit for detecting a bending amount in a short direction with respect to a longitudinal direction of the electrode based on a detection result in the sensor unit;
A winding machine comprising: a speed control unit configured to change a conveyance speed of the electrode in the electrode conveyance unit based on the amount of curvature detected by the curvature detection unit.

  In such a configuration, even if the electrode conveyance speed is set high in order to improve the production efficiency of the electrode body, the electrode being conveyed is changed by changing the electrode conveyance speed based on the detected amount of bending of the electrode. In this case, the position adjustment in the short direction of the electrode by the electrode adjusting unit is prevented from being unable to follow the shift when the shift in the short direction due to the curvature occurs. For this reason, even if the electrode includes a curved portion, the winding in the electrode body (specifically, the electrode body formed by winding the electrode and the separator in the winding portion) is performed. A shift in the position of the electrode in the axial direction is suppressed.

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

  According to such a configuration, even if the electrode to be conveyed includes a curved portion by a simple control such as reducing the electrode conveyance speed when the bending amount exceeds a predetermined value (predetermined size). The displacement of the position of the electrode in the winding axis direction in the electrode body formed in the winding part is preferably suppressed.

Also,
The speed control unit may reduce 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.

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 such a 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 position in the short direction of the electrode supplied (transported) to the winding unit The displacement of the electrode is further suppressed, and the displacement of the position of the electrode in the winding axis direction in the formed electrode body is more preferably suppressed.

Thus, when a plurality of electrode 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 position 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,
A supply unit capable of rotating the electrode roll around the central axis of the roll and feeding the electrode out of the roll;
The supply unit may include a roll adjustment unit that moves the roll in a central axis direction of the roll based on a detection result of the sensor unit while feeding the electrode.

  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 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 bending detection unit detects the bending amount in the positive electrode based on the detection result in the positive electrode sensor unit, and detects the bending amount in the negative electrode based on the detection result in the negative electrode sensor unit,
The speed control unit is configured to transfer the positive electrode in the positive electrode conveying unit and the negative electrode in the negative electrode conveying unit based on at least one of the bending amount of the positive electrode and the bending amount of the negative electrode. The speed may be changed.

  According to such a configuration, in the electrode body formed by the winding part, a positional shift in the winding axis direction of at least one of the positive electrode and the negative electrode can be suppressed.

The electrode winding method according to the present invention includes:
An electrode winding method for winding the transported electrode and separator so that the separator is positioned between the electrodes while transporting the strip-shaped electrode and the strip-shaped separator,
Detecting the amount of bending in the short direction with respect to the longitudinal direction of the electrode being conveyed;
Adjusting the position of the electrode in the short direction of the electrode being transported based on the detection result, and changing the transport speed of the electrode based on the detected bending amount of the electrode.

  In such a configuration, even if the electrode conveyance speed is set high in order to improve the production efficiency of the electrode body, the electrode being conveyed is changed by changing the electrode conveyance speed based on the detected amount of bending of the electrode. In this case, it is possible to prevent the position adjustment in the short direction of the electrode from following the shift when the shift in the short direction due to the bending occurs. As a result, even if the electrode includes a curved portion, the displacement of the position of the electrode in the winding axis direction in the formed electrode body can be suppressed.

In the winding method of the electrode,
In the change in the transport speed, the transport speed of the electrode may be reduced when the bending amount is equal to or larger than a predetermined magnitude.

  According to such a configuration, a portion where the electrode to be transported is curved by simple control of the transport speed such that the transport speed of the electrode is reduced when the bending amount exceeds a predetermined value (predetermined size). Even so, the positional deviation of the electrode in the winding axis direction in the formed electrode body is suitably suppressed.

in this case,
The detection of the amount of bending is performed when the first electrode and the first separator are wound,
It is preferable that the change in the conveying speed of the electrode is performed when the second electrode and the second separator are wound after the first electrode and the first separator have been rolled.

  Since the conveyance speed does not change between the beginning and end of the first electrode and the first separator and between the beginning and end of the second electrode and the second separator, The tension applied to the (or second) electrode and the first (or second) separator and the transport speed of the first (or second) electrode and the first (or second) separator are constant (same), respectively. Can be. Accordingly, the quality of the wound first (or second) electrode and the first (or second) separator (rolled body) is further improved, that is, the turbulence in the wound body is reduced. .

Also,
In the change in the transport speed, the transport speed of the electrode may decrease 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 displacement of the electrode being transported in the lateral direction due to the curvature occurs, It can prevent more reliably that position adjustment cannot follow.

  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 is also provided with the supply part 10 which can send out the electrode 2 grade | etc.,. 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 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 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. 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. Configured.

  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 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 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.

  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 94 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 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 detection signal from the first sensor unit 71, the first position control unit 911 shortens the positive electrode 21 adjusted by the positive electrode adjustment unit 81 with respect to the positive electrode adjustment unit 81 corresponding to the first sensor unit 71. A distance in the hand direction (a distance corresponding to a shift in the short direction from the conveyance 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 detection signal, the distance in the central axis direction of the positive electrode roll R ₁ that is moved (moved forward / backward) by the roll adjustment unit 132 is output to the roll adjustment unit 132 of the positive electrode supply unit 13 as an instruction signal.

  Based on the detection signal from the second sensor unit 72, the third position control unit 913 shortens the negative electrode 22 adjusted by the negative electrode adjustment unit 82 with respect to the negative electrode adjustment unit 82 corresponding to the second sensor unit 72. A distance in the hand direction (a distance corresponding to a 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 detection signal, 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.

  Based on the detection signal from the third sensor unit 73, the fifth position control unit 915 adjusts the separator adjustment unit 83 corresponding to the third sensor unit 73 by the separator adjustment unit 83. The distance in the short direction (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 in the short direction with respect to the longitudinal direction of the electrode 2 (hereinafter, also simply referred to as “bending amount”) based on a 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 curvature 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 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 this embodiment uses the detection signal from at least one first sensor unit 71 among the plurality of first sensor units 71 to determine the amount of curvature at each position in the longitudinal direction of the positive electrode 21. Although required, it is not limited to this configuration. The first bending detection unit 921 may be configured to obtain the amount of bending of the positive electrode 21 at the detection position in each first sensor unit 71 using the 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 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 curvature detection unit 921 of the present embodiment uses the detection signal from at least one second sensor unit 72 among the plurality of second sensor units 72 to determine the amount of curvature at each position in the longitudinal direction of the negative electrode 22. Although required, it is not limited to this configuration. 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 detection signal from each second sensor unit 72.

  The speed control unit 93 changes the transport speed of the electrode 2 in the electrode transport unit 3 based on the curvature amount of the electrode 2 detected by the curvature detection unit 92. The speed control unit 93 of the present embodiment reduces the transport speed of the electrode 2 in the electrode transport unit 3 when the bending amount is equal to or greater than a predetermined magnitude. Specifically, the speed controller 93 controls (adjusts) the transport speed of the electrode 2 in the electrode transport section 3 and the transport speed of the separator 4 in the separator transport section 5 based on the output signal from the curvature detection section 92. The speed control unit 93 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. On the other hand, when the amount of bending becomes smaller than a predetermined amount (a predetermined amount of bending amount) in the input output signal, the first speed control unit 931 conveys the positive electrode after a predetermined time has elapsed since the time when the amount decreased. The conveyance speed of the positive electrode 21 in the part 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 predetermined time is a time required until the portion of the positive electrode 21 in which the bending amount is detected to be smaller than a predetermined size is conveyed to the winding unit 6.

  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 (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. On the other hand, when the amount of bending becomes smaller than a predetermined amount (a predetermined amount of bending amount) in the input detection signal, the second speed control unit 932 conveys the negative electrode after a predetermined time has elapsed since the time when the amount decreased. The conveyance speed of the negative electrode 22 in the part 32 is returned to the normal 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. The predetermined time is a time required until the portion of the negative electrode 22 where the bending amount is detected to be smaller than a predetermined size is transported to the winding unit 6.

  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 in the range of the amount of bending).

  In the above first speed control unit 931 and second speed control unit 932, when the first speed control unit 931 switches the transport mode of the positive electrode transport unit 31 based on the output signal from the first curve detection unit 921, at the same time, The second speed control unit 932 also switches the conveyance mode of the negative electrode conveyance unit 32 to be the same as the conveyance mode of the positive electrode conveyance unit 31. In addition, when the second speed control unit 932 switches the transport mode of the negative electrode transport unit 32 based on the output signal from the second curvature detection unit 922, the first speed control unit 931 also sets the transport mode of the positive electrode transport unit 31 at the same time. It switches so that it may become the same as the conveyance mode of the negative electrode conveyance part 32. FIG.

  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.

  The winding amount measuring unit 94 measures the winding amount of the electrode 2 and the separator 4 in the winding unit 6 based on the winding signal from the winding unit 6, and the electrode 2 and the separator 4 having a predetermined length are wound. When it is detected that it has been turned (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. The winding amount measuring unit 94 of the control unit 9 is configured so that the electrodes 2 (the positive electrode 21 and the negative electrode 22) and the winding unit 6 in the winding unit 6 are based on the winding signal from the time when each of the transport units 31, 32, 51, 52 is operated. The measurement of the winding amount of the separator 4 (first separator 41, second separator 42) is started.

  Subsequently, the speed control unit 93 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”). The conveying speed of “positive electrode 21 etc.” is increased to the set speed. And if the conveyance speed in each conveyance part 31, 32, 51, 52 rises to a setting speed, the speed control part 93 will maintain the conveyance speed in each conveyance part 31, 32, 51, 52 with a setting speed ( Step S2). That is, the speed control unit 93 operates each of the transport units 31, 32, 51, and 52 in the normal transport mode. At this time, the positive electrode 21 and the like are supplied to the winding unit 6 with a predetermined (constant) tension, and are wound in a state where the tension is applied.

  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. Accordingly, the curvature detection unit 92 obtains the amount of curvature (degree of curvature) at each position in the longitudinal direction of the positive electrode 21 and the negative electrode 22 based on the detection results of the first sensor unit 71 and the second sensor unit 72. Further, while the positive electrode 21 and the like are being conveyed, the winding amount measuring unit 94 continues to measure the winding amount of the electrode 2 and the like in the winding unit 6.

  Further, in parallel with the detection of the bending amount of the positive electrode 21 and the negative electrode 22 by the bending detection unit 92 and the measurement of the winding amount in the winding unit 6 by the winding amount measurement unit 94, the first to fifth positions. The control units 911 to 915 control the adjustment units 81, 82, 83, and 132 based on detection signals from the sensor units 71, 72, and 73, and determine the position in the short direction of the positive electrode 21 and the like in each conveyance path. Adjust each. 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.

  If the bending detection unit 92 determines that the detected bending amount is not less than a predetermined size in a state in which the winding operation of the positive electrode 21 or the like in the normal conveyance mode continues (No in step S3), the first to the first steps. The third speed control units 931 to 933 control the transport units 31, 32, 51, and 52 so that the transport speed of the positive electrode 21 and the like is smaller than the set 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 rated transport mode to the low speed transport mode (step S4). 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 S3: Yes), the winding machine 1 is normally transported. The winding operation of the electrode 2 or the like in the mode is continued, and it is determined whether or not the positive electrode 21 or the like having a predetermined length is wound in the winding unit 6 (step S8), that is, the process proceeds to step S8.

  When the winding amount measuring unit 94 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 low-speed conveyance mode (step S5: 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 S9). On the other hand, if the winding amount measuring unit 94 determines that the positive electrode 21 or the like having a predetermined length is not wound in the winding unit 6 (step S5: 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.

  When the curving operation of the positive electrode 21 or the like in the low-speed conveyance mode continues, the curving detection unit 92 determines that the detected curving amount has become smaller than a predetermined size (step S6: Yes). The third speed control units 931 to 933 switch the transport mode of each of the transport units 31, 32, 51, and 52 from the low speed transport mode to the normal transport mode after a predetermined time has elapsed from the time when the speed becomes smaller (step S7). 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, 52 to the rated 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 bending detection unit 92 determines that the detected bending amount is smaller than the predetermined size (less than the predetermined size) (step S6: No), the winding machine 1 performs step S5. Then, the winding operation of the positive electrode 21 and the like in the low-speed conveyance mode is continued.

  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. The control unit 9 operates each of the conveyance units 31, 32, 51, and 52 in the low-speed conveyance mode every time a bending amount of a predetermined size or more is detected while the large bending amount is continuously detected. Let

  When the winding amount measuring unit 94 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 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 S9). On the other hand, when the winding amount measuring unit 94 determines that the positive electrode 21 or the like having a predetermined length is not wound in the winding unit 6 (step S8: No), the winding machine 1 returns to step S3. Continue the winding operation of the positive electrode 21 and the like in the normal transport mode.

  When the winding amount measuring unit 94 determines that the positive electrode 21 or the like having a predetermined length has been wound in the winding unit 6, the control unit 9 includes the transport units 31, 32, 51, 52, and the supply units. 13-16 and the winding part 6 are stopped (step S9). Subsequently, in the winding unit 6, the positive electrode 21, the negative electrode 22, and the separators 41 and 42 are cut (step S10), 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 process returns to step S1, and 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.

  As described above, in the winding machine 1 of the present embodiment, the detected electrode 2 (specifically, the positive electrode 21 is detected even if the set speed (conveyance speed) is set high in order to improve the production efficiency of the electrode body 23. And the conveying speed of the electrode 2 changes based on the amount of curvature of the negative electrode 22). In the winding machine 1 of the present embodiment, when the detected amount of bending is large (greater than a predetermined size), the conveyance speed of the electrode 2 is small. 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). It is possible to effectively prevent the position adjustment in the short direction of the electrode 2 from following the shift. Thus, even if the electrode 2 includes a curved portion, the electrode body 23 formed in the winding part 6 (that is, formed by winding the electrode 2 and the separator 4 by the winding part 6). The displacement of the position of the electrode 2 in the winding axis direction in (winding body)) is suppressed.

  Moreover, in the winding machine 1 of the present embodiment, when the bending amount exceeds a predetermined value (predetermined size), the simple control such as decreasing the transport speed of the electrode 2 (that is, switching the transport mode), Even if the transported electrode 2 includes a curved portion, the displacement of the position of the electrode 2 in the winding axis direction in the electrode body 23 formed in the winding portion 6 is suitably suppressed.

  In the winding machine 1 of the present embodiment, a plurality of electrode adjustment units 80 are provided along the transport 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, in the winding machine 1 of the above-described embodiment, when the detected bending amount exceeds a predetermined magnitude, the positive electrode 21 and the like are transported at a predetermined speed (low speed transport mode) smaller than the set speed, When the detected bending amount becomes smaller than a predetermined magnitude, the positive electrode 21 and the like are transported at a set speed (normal transport mode), but the present invention is not limited to this configuration. For example, the winding machine 1 may be configured such that the conveyance speed of the positive electrode 21 or the like changes based on the detected amount of bending. Specifically, the winding machine 1 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 winding machine 1 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 can prevent more reliably that the position adjustment of the transversal direction of the electrode 2 cannot follow.

  Further, when the winding machine 1 determines that the bending amount of the electrode 2 is not less than a predetermined size (that is, not less than a 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 the electrode body 23 formed next to the electrode body 23 formed at the winding part 6 at the time of detection is formed (at the time of winding), the speed is low from the beginning (start of winding) to the end (end of winding). The electrode 2 may be transported to the winding unit 6 in the transport mode. According to such a configuration, since the conveying speed of the positive electrode 21 or the like does not change from the start to the end of the winding of the positive electrode 21 or the like in the winding unit 6, the positive electrode 21 or the like when the positive electrode 21 or the like is supplied to the winding unit 6. The tension applied to the positive electrode 21 and the like and the conveying speed of the positive electrode 21 and the like are each constant (same), and as a result, the quality of the formed electrode body 23 is further improved. That is, the disturbance of the positive electrode 21 and the like in the electrode body 23 is further reduced.

  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 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, 521 ... Conveyance roller, 6 ... Winding part, 61 ... Winding shaft, 610 ... Shaft core, 7 ... Sensor part, 71 ... 1st One sensor unit, 72 ... second sensor unit, 73 ... third sensor unit, 8 ... position adjusting unit, 80 ... electrode adjusting unit, 81 ... positive electrode adjusting unit, 811 ... roller, 812 ... driving unit, 82 ... negative electrode adjusting unit , 83 ... Separator adjustment part, 9 ... Control part, 91 ... Position control 911 ... first position controller, 912 ... second position controller, 913 ... third position controller, 914 ... fourth position controller, 915 ... fifth position controller, 92 ... curve detection , 921..., First curvature detection unit, 922... Second curvature detection unit, 93... Speed control unit, 931... First speed control unit, 932. 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 Part, R ₁ ... positive electrode roll (roll), R ₂ ... negative electrode roll (roll), R ₃ ... first roll, R ₄ ... second roll

Claims (14)

An electrode transport section for transporting the belt-shaped electrode;
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 curvature detection unit for detecting a bending amount in a short direction with respect to a longitudinal direction of the electrode based on a detection result in the sensor unit;
A winding machine comprising: a speed control unit configured to change a conveyance speed of the electrode in the electrode conveyance unit based on the amount of curvature detected by the curvature detection unit.   2. The winding machine according to claim 1, wherein the speed control unit reduces a transport speed of the electrode in the electrode transport section when the bending amount is equal to or larger than a predetermined size.   2. The winding machine according to claim 1, wherein the speed control unit decreases a transport speed of the electrode in the electrode transport unit as the bending amount increases.   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. A supply unit capable of rotating the electrode roll around the central axis of the roll and feeding the electrode out of the roll;
The said supply part has a roll adjustment part which moves the said roll to the center axis direction of this roll based on the detection result in the said sensor part, sending out the said electrode, The any one of Claims 1-7. 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. 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 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 bending detection unit detects the bending amount in the positive electrode based on the detection result in the positive electrode sensor unit, and detects the bending amount in the negative electrode based on the detection result in the negative electrode sensor unit,
The speed control unit is configured to transfer the positive electrode in the positive electrode conveying unit and the negative electrode in the negative electrode conveying unit based on at least one of the bending amount of the positive electrode and the bending amount of the negative electrode. The winding machine according to any one of claims 1 to 9, wherein the speed is changed. An electrode winding method for winding the transported electrode and separator so that the separator is positioned between the electrodes while transporting the strip-shaped electrode and the strip-shaped separator,
Detecting the amount of bending in the short direction with respect to the longitudinal direction of the electrode being conveyed;
Adjusting the position of the electrode in the short direction of the electrode being transported based on the detection result, and changing the transport speed of the electrode based on the detected bending amount of the electrode, Electrode winding method.   The electrode winding method according to claim 11, wherein when the amount of bending is equal to or greater than a predetermined magnitude, the electrode conveying speed decreases when the conveying speed changes. The detection of the amount of bending is performed when the first electrode and the first separator are wound,
The change of the conveyance speed of the electrode is performed at the time of winding of the second electrode and the second separator wound after the first electrode and the first separator have been rolled. Electrode winding method.   The electrode winding method according to claim 11, wherein the change in the transport speed decreases the transport speed of the electrode as the amount of bending increases.

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