JP2017126501A - Dividing method for sheet-like electrode member, and dividing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dividing method for a sheet-like electrode member capable of implementing such a division that dimensions of all tab parts are settled within a predetermined tolerance as further as possible.SOLUTION: The present invention relates to a dividing method for a sheet-like electrode member A including: cutting the rolled-out sheet-like electrode member A with a cutter unit 14 while rolling out the rolled sheet-like electrode member A in which both sides of a metal foil are coated with an active material layer; and forming two lines of sheet-like electrode embers B and C including tab parts B2 and C2 of a predetermined width in which the metal foil is not coated with the active material layer, and coated parts B1 and C1 of a predetermined width in which the metal foil is coated with the active material layer. The dividing method for the sheet-like electrode member A also includes: measuring tab lengths that are dimensions of four tab parts B21, B22, C21 and C22 which are formed in two locations on a front side and a rear side of the sheet-like electrode members B and C at a downstream side of the cutter unit 14 in a width direction; and adjusting relative positions of cutters 14A-14D of the cutter unit 14 and the sheet-like electrode member A in the width direction based on the tab lengths.SELECTED DRAWING: Figure 3

Description

  TECHNICAL FIELD The present invention relates to a sheet electrode member dividing method and a dividing apparatus, and in particular, is useful when applied to a battery manufacturing process including a step of processing a sheet electrode member obtained by coating an active material layer on a metal foil to be an electrode. It is.

  In the manufacturing process of a lithium ion battery which is a kind of secondary battery, a winder is wound while rewinding from a winder in which a sheet-like electrode member in which an active material layer is coated on a metal foil to be an electrode is wound in a roll shape. In the process of being conveyed, the tab portion having a predetermined width which is an uncoated portion of the active material layer is formed, and the coated portion of the active material layer having a predetermined width is formed. More specifically, in this type of sheet-like electrode member, an uncoated portion of the active material layer is formed at the end in the width direction, which is a direction orthogonal to the conveying direction. A cutter unit disposed in the middle of the conveyance path is cut along the conveyance direction to form a tab portion having a predetermined size and the width of the coating portion is adjusted. This tab part becomes the connection part of an electrode cell, and a coating part becomes a power generation part of a battery cell.

  Therefore, the tab length, which is the dimension of the tab portion, is measured on the downstream side of the cutter unit, and the relative position between the center line in the transport direction of the sheet-like electrode member and the cutter of the cutter unit is set so that the tab length falls within a predetermined dimension. It is adjusting. However, conventionally, the tab length is measured only at one location downstream of the cutter unit.

  On the other hand, the sheet-like electrode member originally applied the active material layer only to one side (surface) of the metal foil to be an electrode. Further, only a single sheet-like electrode member having a tab portion cut to a predetermined tab length is obtained from the original sheet in the processing step.

  On the other hand, from the viewpoint of improving the production efficiency of the battery, recently, a raw material in which a predetermined active material layer is applied to both the front and back surfaces of the metal foil is formed, and a single raw material is divided into two in the transport direction. The two strips forming two sheet-like electrode members at a time are employed. In such a case, the tab portions whose dimensions are to be managed are formed at two positions on both ends in the width direction on both the front and back surfaces, for a total of four positions.

  In addition, as a related publicly known document, Patent Document 1 is known as a battery material conveying device that can accurately detect the presence or absence of the protruding protrusion of the gel electrolyte, and the width direction of the web. Patent Document 2 exists as a web conveyance device that performs meandering correction control for correcting a shift to the angle.

JP 2001-307778 A JP 2011-042458 A

  As described above, even when the sheet material electrode member with two strips is obtained by cutting the raw material coated with the active material layer on both the front and back surfaces, the tab length is detected only at one location on the downstream side of the cutter unit. Since the relative positional relationship between the sheet-like electrode member and the cutter of the cutter unit was adjusted based on the detection information, the tab lengths at the remaining three unmanaged positions may not fit within the tolerance. The problem was that the sheet-like electrode member had to be discarded afterwards.

  In the present invention, in view of the above prior art, in the case of obtaining a sheet material electrode member with two strips by cutting the raw material coated with an active material layer on both the front and back surfaces, the dimensions of all four tab portions are possible. In particular, an object of the present invention is to provide a sheet-like electrode member dividing method and a dividing apparatus that can realize division within a predetermined tolerance.

The first aspect of the present invention for achieving the above object is as follows:
An active material layer is coated on both surfaces of the metal foil, and the sheet-like electrode member wound while being unwound in a roll is cut with a cutter unit, and the metal foil is cut. A sheet-like electrode member for forming two sheet-like electrode members having a tab portion having a predetermined width on which the active material layer is not applied and a coating portion having a predetermined width on which the active material layer is applied to the metal foil Dividing method,
While measuring each tab length which is the dimension in the said width direction of the tab part of four places formed in each two places of the surface and back surface of the said sheet-like electrode member in the downstream of the said cutter unit, each tab length The sheet electrode member dividing method is characterized in that the relative position between the cutter of the cutter unit and the sheet electrode member in the width direction is adjusted.

  According to this aspect, since the relative positions of the cutter and the sheet-like electrode member of the cutter unit are adjusted based on each tab length while detecting the tab length at all locations, the tab lengths at all locations have tolerances. It can be easily adjusted to fit within.

The second aspect of the present invention is:
In the dividing method of the sheet-like electrode member described in the first aspect,
It is the dimension of the tab part between the end face of the metal foil of the sheet-like electrode member after being cut and the end face of the coating part, and the one on the surface in the width direction of the sheet-like electrode member The measured dimension of the tab portion is the ear width Va, and the measured dimension of the tab portion on the other side surface in the width direction of the sheet-like electrode member is the ear width Vb, on the back surface of the one side in the width direction of the sheet-like electrode member. The measured dimension of the tab portion is an ear width Wa, and the measured dimension of the tab portion on the back surface on the other side in the width direction of the sheet-like electrode member is an ear width Wb.
When the design value, which is the design dimension of each tab portion, is Z, and the difference between the design value Z and each ear width Va, Vb, Wa, Wb is the displacement amounts Xa, Xb, Xc, Xd, respectively, The position of the center line with respect to the longitudinal direction of the sheet-like electrode member is moved by the movement amount L obtained in (1) so that the displacement amounts Xa, Xb, Xc, and Xd are reduced with respect to the width direction. The sheet-like electrode member is divided.
Movement amount L = − {(Va−Z) + (Z−Vb) + (Wa−Z) + (Z−Wb)} / 4 (1)

  According to this aspect, since the deviation between the tolerances of the tab lengths can be rationally allocated for each tab length, each tab length can be easily and appropriately within the tolerance.

The third aspect of the present invention is:
An active material layer is coated on both surfaces of the metal foil, and an unwinding unit for unwinding the sheet-like electrode member wound in a roll shape;
The sheet-like electrode member unwound from the unwinding unit is cut, and the active material layer is applied to the tab having a predetermined width where the active material layer is not applied to the metal foil and the metal foil. A cutter unit for forming a sheet-like electrode member having a coating portion having a predetermined width;
A tab length measuring unit for measuring a tab length which is a dimension of the tab portion in the width direction of the sheet-like electrode member on the downstream side of the cutter unit;
A winding unit for winding the sheet electrode member into a roll;
In the sheet-like electrode member splitting device having a position adjustment unit that adjusts the relative position of the cutter of the cutter unit and the sheet-like electrode member in the width direction based on the measurement result of the tab length measurement unit,
The sheet-like electrode member is coated with the active material layer except for both ends in the width direction,
In the cutter unit, two sheet-like electrode members are formed,
The tab length measurement unit measures the tab length of the sheet-like electrode member on each of the front and back surfaces of the sheet-like electrode member on one side and the other side in the width direction,
The position adjustment unit adjusts the tab length to a predetermined dimension by moving the position of the center line in the longitudinal direction of the sheet-like electrode member in the width direction based on the measurement result. It exists in the division | segmentation apparatus of the sheet-like electrode member made into.

  According to this aspect, since the relative position between the cutter of the cutter unit and the sheet-like electrode member can be adjusted based on each tab length while detecting the tab length at all locations, the tab length at all locations is It can be easily adjusted to fit within tolerances.

The fourth aspect of the present invention is:
In the sheet electrode member splitting device described in the third aspect,
In the position adjustment unit, the measured dimension of the tab portion on one side surface in the width direction of the sheet-like electrode member measured by the tab length measurement unit is the ear width Va, and the other side in the width direction of the sheet-like electrode member. The measured dimension of the tab portion on the surface of the sheet is the ear width Vb, and the measured dimension of the tab portion on the back surface on the one side with respect to the width direction of the sheet-like electrode member is the ear width Wa, and the width direction of the sheet-like electrode member. The measured dimension of the tab portion on the back surface on the other side is the ear width Wb,
When the design value, which is the design dimension of each tab portion, is Z, and the difference between the design value Z and each ear width Va, Vb, Wa, Wb is the displacement amounts Xa, Xb, Xc, Xd, respectively, The position of the center line with respect to the longitudinal direction of the sheet-like electrode member is moved by the movement amount L obtained in (1) so that the displacement amounts Xa, Xb, Xc, and Xd are reduced with respect to the width direction. Dividing device for sheet-like electrode member.
Movement amount L = − {(Va−Z) + (Z−Vb) + (Wa−Z) + (Z−Wb)} / 4 (1)

  According to this aspect, since the deviation between the tolerances of the tab lengths can be rationally allocated for each tab length, each tab length can be easily and appropriately within the tolerance.

  According to the present invention, the relative positions of the cutter and the sheet-like electrode member are adjusted based on the lengths of the four tabs on the downstream side of the cutter unit. That is, the tab lengths of the tab portions formed on the front and back surfaces of the sheet-like electrode member cut into two strips are detected, and the relative position is adjusted based on the detection result. Location, all tab lengths can be well within tolerance. As a result, the sheet-like electrode member discarded in the dividing step can be saved as much as possible, and good cost performance can be realized.

It is explanatory drawing which shows notionally 2 striping of the sheet-like electrode member divided | segmented by the division | segmentation apparatus of the sheet-like electrode member which concerns on embodiment of this invention. It is a schematic block diagram which shows the division | segmentation apparatus of the sheet-like electrode member which concerns on embodiment of this invention seeing from a side surface. FIGS. 3A and 3B are diagrams showing the sheet-like electrode member dividing device shown in FIG. 2 in plan view, in which FIG. 2A is a schematic configuration diagram showing a mode before correction of the shift amount, and FIG. 2B is a schematic configuration diagram after correction of the shift amount. is there. It is explanatory drawing which shows the principle of the position shift correction | amendment in the case of 2 striping in the said embodiment. It is a figure which shows the 1st specific example of the position shift correction in the case of 2 striping in the said embodiment, (a) is before correction | amendment, (b) is explanatory drawing which shows the state after correction | amendment. It is a figure which shows the 2nd specific example of the position shift correction | amendment in the case of 2 striping in the said embodiment, (a) is an explanatory view which shows the state before correction | amendment and (b). It is a figure which shows the 3rd specific example of the position shift correction in the case of 2 striping in the said embodiment, (a) is an explanatory view which shows the state before correction | amendment and (b) after correction | amendment. It is a figure which shows the 4th specific example of the position shift correction in the case of 2 striping in the said embodiment, (a) is before correction | amendment, (b) is explanatory drawing which shows the state after correction | amendment. It is a figure which shows the 5th specific example of the position shift correction in the case of 2 striping in the said embodiment, (a) is before correction | amendment, (b) is explanatory drawing which shows the state after correction | amendment. It is a figure which shows the 6th specific example of the position shift correction | amendment in the case of 2 striping in the said embodiment, (a) is an explanatory view which shows the state before correction | amendment and (b).

  Prior to describing the sheet-like electrode member dividing device according to the embodiment of the present invention, the two strips of the sheet-like electrode member divided according to this embodiment will be described. This form is a case where two predetermined sheet-like electrode members are removed from the raw fabric in which the active material layer is applied to both the front and back surfaces of the metal foil. That is, as shown in FIG. 1A, a single sheet-like electrode member A serving as a raw fabric is formed by applying an active material layer 2 on both front and back surfaces of a metal foil 1. More specifically, a coating portion 1A of the active material layer 2 serving as a power generation portion of the battery is formed in a region having a predetermined width in the center portion of the metal foil 1, and one side in the width direction (Y-axis direction in the figure) ( Uncoated portions 1B and 1C of the active material layer 2 serving as battery lead portions are formed at the ends on the left side and the other side (right side), respectively.

  One sheet-like electrode member A is conveyed along the X-axis direction in the drawing, and is cut by a cutter of a cutter unit, which will be described in detail later, in the middle of the conveyance, and is divided into two pieces to form two sheet-like electrode members B and C. That is, as shown in FIG. 1 (b), one sheet-like electrode member B, which is opposite to A, has a coating part B1 composed of a part of the coating part 1A coated with an active material layer 2 having a predetermined width. And a tab portion B2 formed of a part of the uncoated portion 1B. The other sheet-like electrode member C that is anti-B is a tab part that consists of a part of the coated part 1A coated with the active material layer 2 having a predetermined width and a part of the uncoated part 1C. C2. The coating parts B1 and C1 and the tab parts B2 and C2 are managed within a predetermined tolerance in dimensions when being cut by the cutter unit. For this reason, tab part B2, C2 among the hollow part D between coating part B1, C1, which is a part of sheet-like electrode member A, and uncoated part 1B, 1C (refer Fig.1 (a)). The outer slits E and F are discarded after being cut by the cutter of the cutter unit. Thus, the sheet-like electrode member A is cut to obtain two sheet-like electrode members B and C in which the dimensions of the coating portions B1 and C1 and the tab portions B2 and C2 are within a predetermined tolerance range. Note that the tip of the triangle mark in the figure indicates the position of the blade edge of the cutters 14A, 14B, 14C, and 14D, which will be described in detail later.

  A sheet-like electrode member splitting device according to an embodiment of the present invention that performs such two strips will be described in detail with reference to the drawings. FIG. 2 is a schematic configuration diagram showing the sheet-like electrode member splitting device according to the present embodiment as seen from the side, FIG. 3 is a diagram showing it in plan view, and (a) is a schematic configuration shown in a mode before misalignment correction. FIG. 4B is a schematic configuration diagram after the shift amount correction. As shown in both figures, a sheet-like electrode member A, which is a raw material in which an active material layer is applied on both surfaces of a metal foil, is wound around a roll 11 of the cylindrical roller 11A. . Winders 12 and 13 (not shown in FIG. 3) are wound from the winder 11 and wind the two sheet-like electrode members B and C divided by the cutter unit 14, respectively.

  The cutter unit 14 is disposed between the unwinder 11 and the winders 12 and 13 in the middle of the transport path of the sheet-like electrode member A and the sheet-like electrode members B and C, and the transport direction (X in FIG. 3). The sheet electrode member A is divided into two along the axial direction (hereinafter the same) to form the sheet electrode members B and C, and the width direction (the Y axis direction in FIG. 3; the same applies below) perpendicular to the transport direction Tab portions B2 and C2 which are regions of a predetermined width of the metal foil 1 to which the active material layer 2 is not applied at both ends are formed. Here, the cutter unit 14 has cutters 14A, 14B, 1C, and 14D that are four blades, and the width direction dimension of the sheet-like electrode member B (coating portion) is between the cutter 14A and the cutter 14B. B1 and the length of the tab part B2), the width direction dimension of the hollow portion D is between the cutter 14B and the cutter 14C, and the width direction dimension of the sheet-like electrode member C is between the cutter 14C and the cutter 14D ( The length of the coating portion C1 and the tab portion C2 is adjusted.

  Tab length monitoring cameras 15, 16, 17, 18 constituting the tab length measuring means in this embodiment (note that the tab length monitoring cameras 15, 17 monitor the tab length on the surface side of the sheet-like electrode members B, C, and The length monitoring cameras 16 and 18 monitor the tab length on the back side of the sheet-like electrode members B and C; the same applies hereinafter) is the tab portion on the surface side of the sheet-like electrode member B obtained as a result of cutting in the cutter unit 14 Together with B21 and the tab portion B22 on the back surface side, the tab length which is the length in the width direction of the tab portion C21 on the front surface side and the tab portion C22 on the back surface side of the sheet-like electrode member C is detected. As a result, the obtained tab lengths are L1, L2, L3, and L4 in this order. Signals representing the tab lengths L1 to L4 are supplied to the adjusting means 19 and a predetermined process is performed. Thus, the relative positions of the cutters 14A to 14D of the cutter unit 14 and the sheet-like electrode members B and C in the width direction are adjusted based on signals representing the tab lengths L1 to L4. In this embodiment, since the cutter unit 14 is fixed, if necessary, the roller 11A of the unwinding machine 11 is controlled by a control signal Sc that is an output signal of the adjusting means 19 as indicated by an arrow in FIG. To adjust the center position of the sheet-like electrode member A in the width direction. Here, the edge position detection sensor 20 that detects the position of one end portion of the sheet-like electrode member A moves in the same direction in synchronization with the axial movement of the roller 11A, and the edge position of the sheet-like electrode member A is detected. Information is fed back to the adjusting means 19 to adjust the positional deviation of the sheet-like electrode member A being conveyed during conveyance. Thus, as shown in FIG. 2, the rollers 21, 22, 23, 24, 25, 26 support the middle of the sheet-like electrode members B, C along the predetermined conveying direction toward the winders 12, 13. Are transported. Therefore, in the present embodiment, the adjustment unit 19 and the edge position detection sensor 20 form a position adjustment unit.

  Next, a deviation amount correction method in this embodiment will be described in detail with reference to the drawings. 4 to 10, the same parts are denoted by the same reference numerals, and redundant description is omitted.

FIG. 4 is an explanatory diagram showing the principle of this embodiment. As shown in the figure, the sheet-like electrode member A is divided into two on one side (left side in the drawing) and the other side (right side in the drawing) with the hollow portion D interposed therebetween. Here, the measured dimension at the tab portion B21 of the sheet-like electrode member B measured by the tab length measurement unit is the ear width Va (= tab length L1), and the measured dimension at the tab portion C21 of the sheet-like electrode member C is the ear width Vb ( = Tab length L2), the measured dimension at the tab portion B22 of the sheet-like electrode member B is the ear width Wa (= tab length L3), and the measured dimension at the tab portion C22 of the sheet-like electrode member C is the ear width Wb (= tab length L4). ), Z is a design value that is a design dimension of each of the tab portions B21, C21, B22, and C22, and differences between the design value Z and the respective ear widths Va, Vb, Wa, and Wb are displacement amounts Xa, Xb, and Ya, respectively. , Yb, in the case shown in FIG. 4, the relationships Xa = Va-Z, Xb = Z-Vb, Ya = Z-Wa, Yb = Wb-Z are established. Therefore, in the adjusting means 19 (see FIG. 3; the same applies hereinafter), the position of the center line in the longitudinal direction of the sheet-like electrode member A is shifted by the displacement amount X obtained by the calculation of the following equation (1). , Ya, Yb are moved in the direction of decreasing (in the case of FIG. 3B, the downward direction along the Y axis).
Movement amount L = − {(Va−Z) + (Z−Vb) + (Wa−Z) + (Z−Wb)} / 4 (1)

  Such shift amount correction processing is performed based on the measured values of the tab lengths L1 to L4 by the tab length detection unit detected at a predetermined cycle (for example, every 5 minutes). The edge position detection sensor 20 detects that the predetermined movement amount L has been reached. Here, the determination of each shift amount is performed by calculating the average value of the shift amounts calculated by sampling a plurality of times (for example, 10 times) every predetermined short period (for example, every second) in the current correction process. For this purpose, the shift amounts Xa, Xb, Ya, Yb are determined. A predetermined movement amount L is determined based on the deviation amounts Xa, Xb, Ya, Yb thus determined. Such processing is executed at predetermined intervals to correct the deviation amounts Xa, Xb, Ya, Yb.

  Here, specific modes of correction processing of the shift amounts Xa, Xb, Ya, Yb in consideration of the moving direction will be described with reference to FIGS. In each figure, the moving direction from the left side to the right side is +, and the reverse direction is-.

<First specific example>
FIGS. 5A and 5B are diagrams showing a first specific example of positional deviation correction. FIG. 5A is an explanatory view showing a state before correction and FIG. 5B is a state after correction. In the case of this example, the amount of deviation on the surface side is (+ 0.1 + 0.1) /2=0.1, so the movement amount L is 0.1 in the − direction. Since the shift amount on the back surface side is (−0.3−0.3) /2=−0.3, the movement amount L is 0.3 in the plus direction. When the movement amount L between the front surface and the back surface is added, −0.2 is obtained. Divide this by 2 to get -0.1. To make this zero, move 0.1 in the + direction.

<Second specific example>
FIGS. 6A and 6B are diagrams showing a second specific example of positional deviation correction. FIG. 6A is an explanatory diagram showing a state before correction and FIG. 6B is a state after correction. In the case of this example, the amount of deviation on the surface side is (+ 0.2 + 0.2) /2=0.2, and thus the movement amount L is 0.2 in the − direction. Since the shift amount on the back surface side is (−0.2−0.2) /2=−0.2, the movement amount L is 0.2 in the plus direction. When the movement amount L between the front surface and the back surface is added, it becomes zero. Therefore, it is not necessary to move in this case.

<Third specific example>
FIGS. 7A and 7B are diagrams showing a third specific example of positional deviation correction, where FIG. 7A is an explanatory view showing a state before correction and FIG. 7B is a state after correction. In the case of this example, the amount of deviation on the surface side is (+ 0.1 + 0.1) /2=0.1, so the movement amount L is 0.1 in the − direction. Since the shift amount on the back surface side is (+ 0.3 + 0.3) /2=+0.3, the movement amount L is 0.3 in the − direction. When the movement amount L between the front surface and the back surface is added, it becomes +0.4, which is divided by 2 to be +0.2. To make this zero, move 0.2 in the-direction.

<Fourth specific example>
FIGS. 8A and 8B are diagrams showing a fourth specific example of positional deviation correction. FIG. 8A is an explanatory diagram showing a state before correction and FIG. 8B is a state after correction. In the case of this example, the amount of deviation on the surface side is (−0.1−0.1) /2=−0.1, and thus the movement amount L is 0.1 in the + direction. Since the shift amount on the back side is (+ 0.1 + 0.1) /2=+0.1, the movement amount L is 0.1 in the − direction. When the movement amount L between the front surface and the back surface is added, it becomes zero. Therefore, it is not necessary to move in this case.

<Fifth example>
FIGS. 9A and 9B are diagrams showing a fifth specific example of positional deviation correction, where FIG. 9A is an explanatory view showing a state before correction and FIG. 9B is a state after correction. In the case of this example, the amount of deviation on the surface side is (−0.1 + 0.3) /2=0.1, and thus the movement amount L is 0.1 in the − direction. Since the shift amount on the back surface side is (+ 0.3−0.1) /2=+0.1, the movement amount L is 0.1 in the − direction. When the movement amount L between the front surface and the back surface is added, it becomes 0.2, and when this is divided by 2, it becomes 0.1. To make this zero, move 0.1 in the-direction.

<Sixth specific example>
FIG. 10 is a diagram illustrating a sixth specific example of positional deviation correction, where (a) is a diagram before correction and (b) is a diagram illustrating a state after correction. In the case of this example, the amount of deviation on the surface side is (−0.2 + 0.2) / 2 = 0, and therefore the movement amount L is zero. Since the shift amount on the back side is (+ 0.2−0.2) / 2 = 0, the movement amount L is zero. Therefore, it is not necessary to move in this case.

  According to this embodiment, the tab lengths L1 to L4 (see FIG. 3; the same applies hereinafter) respectively formed at four positions including the front and back of the sheet-like electrode members B and C are detected, and the tab lengths L1 to L4 are detected. Since the center position in the width direction of the sheet-like electrode member A on the supply side is adjusted based on the detected value, all the tab lengths L1 to L4 can be well within the tolerance range. Incidentally, when the same position adjustment is performed based on the measurement value at only one place as in the prior art, the tab length L1 (L2 to L4) at the measurement position can be accurately maintained at a predetermined dimension. The tab lengths at other locations are not always within tolerance.

  In the embodiment described above, the adjusting unit 19 calculates the movement amount L by the calculation of Expression (1), but the present invention is not limited to this. As long as each tab length of the tab portion formed at the four positions of the divided sheet-like electrode member is measured and a predetermined relative position adjustment is performed based on each tab length, the technical idea of the present invention include.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used in, for example, an industrial field in which a lithium ion battery is manufactured, for example, having a sheet-like electrode member dividing step in which an active material layer is applied to the front and back surfaces of a metal foil to produce an electrode.

A, B, C Sheet-like electrode member B1, C1 Coating part B2, C2 Tab part 1 Metal foil 2 Active material layer 11 Unwinding machine 11A Roller 12, 13 Winding machine 14 Cutter unit 14A, 14B, 14C, 14D Cutter 15, 16, 17, 18 Tab length monitoring camera 19 Adjustment means 20 Edge position detection sensor

Claims (4)

An active material layer is coated on both surfaces of the metal foil, and the sheet-like electrode member wound while being unwound in a roll is cut with a cutter unit, and the metal foil is cut. A sheet-like electrode member for forming two sheet-like electrode members having a tab portion having a predetermined width on which the active material layer is not applied and a coating portion having a predetermined width on which the active material layer is applied to the metal foil Dividing method,
While measuring each tab length which is the dimension in the said width direction of the tab part of four places formed in each two places of the surface and back surface of the said sheet-like electrode member in the downstream of the said cutter unit, each tab length A method for dividing a sheet-like electrode member, comprising adjusting a relative position between the cutter of the cutter unit and the sheet-like electrode member in the width direction. In the division | segmentation method of the sheet-like electrode member described in Claim 1,
It is the dimension of the tab part between the end face of the metal foil of the sheet-like electrode member after being cut and the end face of the coating part, and the one on the surface in the width direction of the sheet-like electrode member The measured dimension of the tab portion is the ear width Va, and the measured dimension of the tab portion on the other side surface in the width direction of the sheet-like electrode member is the ear width Vb, on the back surface of the one side in the width direction of the sheet-like electrode member. The measured dimension of the tab portion is an ear width Wa, and the measured dimension of the tab portion on the back surface on the other side in the width direction of the sheet-like electrode member is an ear width Wb.
When the design value, which is the design dimension of each tab portion, is Z, and the difference between the design value Z and each ear width Va, Vb, Wa, Wb is the displacement amounts Xa, Xb, Xc, Xd, respectively, The position of the center line with respect to the longitudinal direction of the sheet-like electrode member is moved by the movement amount L obtained in (1) so that the displacement amounts Xa, Xb, Xc, and Xd are reduced with respect to the width direction. A method for dividing a sheet-like electrode member.
Movement amount L = − {(Va−Z) + (Z−Vb) + (Wa−Z) + (Z−Wb)} / 4 (1) An active material layer is coated on both surfaces of the metal foil, and an unwinding unit for unwinding the sheet-like electrode member wound in a roll shape;
The sheet-like electrode member unwound from the unwinding unit is cut, and the active material layer is applied to the tab having a predetermined width where the active material layer is not applied to the metal foil and the metal foil. A cutter unit for forming a sheet-like electrode member having a coating portion having a predetermined width;
A tab length measuring unit for measuring a tab length which is a dimension of the tab portion in the width direction of the sheet-like electrode member on the downstream side of the cutter unit;
A winding unit for winding the sheet electrode member into a roll;
In the sheet-like electrode member splitting device having a position adjustment unit that adjusts the relative position of the cutter of the cutter unit and the sheet-like electrode member in the width direction based on the measurement result of the tab length measurement unit,
The sheet-like electrode member is coated with the active material layer except for both ends in the width direction,
In the cutter unit, two sheet-like electrode members are formed,
The tab length measurement unit measures the tab length of the sheet-like electrode member on each of the front and back surfaces of the sheet-like electrode member on one side and the other side in the width direction,
The position adjustment unit adjusts the tab length to a predetermined dimension by moving the position of the center line in the longitudinal direction of the sheet-like electrode member in the width direction based on the measurement result. A sheet-like electrode member dividing apparatus. In the sheet-like electrode member splitting device according to claim 3,
In the position adjustment unit, the measured dimension of the tab portion on one side surface in the width direction of the sheet-like electrode member measured by the tab length measurement unit is the ear width Va, and the other side in the width direction of the sheet-like electrode member. The measured dimension of the tab portion on the surface of the sheet is the ear width Vb, and the measured dimension of the tab portion on the back surface on the one side with respect to the width direction of the sheet-like electrode member is the ear width Wa, and the width direction of the sheet-like electrode member. The measured dimension of the tab portion on the back surface on the other side is the ear width Wb,
When the design value, which is the design dimension of each tab portion, is Z, and the difference between the design value Z and each ear width Va, Vb, Wa, Wb is the displacement amounts Xa, Xb, Xc, Xd, respectively, The position of the center line with respect to the longitudinal direction of the sheet-like electrode member is moved by the movement amount L obtained in (1) so that the displacement amounts Xa, Xb, Xc, and Xd are reduced with respect to the width direction. Dividing device for sheet-like electrode member.
Movement amount L = − {(Va−Z) + (Z−Vb) + (Wa−Z) + (Z−Wb)} / 4 (1)

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