Electrode manufacturing device for battery

Abstract

To provide an electrode manufacturing device for a battery, that can accurately calculate a difference in an expansion rate between a coated part and a non-coated part.SOLUTION: An electrode manufacturing device 10 for a battery has: a transport unit that transports an electrode body W with a longitudinal sheet shape including a coated part 50 coated with an active material layer and a non-coated part 52 where a metal foil is exposed; a pressing unit that presses the entire electrode body W; an extension unit that extends only the non-coated part 52 in the electrode body W; and a measurement unit 16 that measures heights of the coated part 50 and the non-coated part 52 from a reference point in the electrode body W after the extension in the extension part. The measurement unit 16 includes: a fold-back roll 34 that folds back the electrode body W in an arc like shape by having the electrode body W wound thereon; and a noncontact displacement meter 38 that is disposed at a position facing the electrode body W folded back in the arc like shape by the fold-back roll 34.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apparatus for manufacturing electrodes for batteries. [Background technology]

[0002] Patent Document 1 discloses a roll press facility for pressing an electrode plate. In particular, Patent Document 1 describes measuring the surface shape of the electrode plate with a laser displacement meter and rolling only the metal foil in the uncoated portion with an uncoated portion rolling device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-24861 A Summary of the Invention [Problem to be solved by the invention]

[0004] Although the occurrence of wrinkles in the electrode plate can be suppressed by stretching the uncoated portion of the electrode plate, only the metal foil in the uncoated portion becomes thinner, and a difference in the elongation rate occurs between the coated portion and the uncoated portion, which may cause the uncoated portion to undulate due to the influence of wind during transport, etc. For this reason, even if a laser beam is irradiated perpendicularly to an electrode plate transported horizontally as in the device described in Patent Document 1, the thickness of the uncoated portion in a undulating state cannot be accurately measured, and there is room for improvement in accurately calculating the difference in the elongation rate between the coated portion and the uncoated portion.

[0005] An object of the present invention is to provide a battery electrode manufacturing device that can accurately calculate the difference in elongation rate between a coated portion and an uncoated portion. [Means for solving the problem]

[0006] The battery electrode manufacturing apparatus of claim 1 comprises a conveying section which conveys a long sheet-like electrode body including a coated section coated with an active material layer and an uncoated section where metal foil is exposed, a pressing section which presses the entire electrode body, a stretching section which stretches only the uncoated section in the electrode body, and a measuring section which measures the heights of the coated section and the uncoated section from a reference point in the electrode body after it has been stretched in the stretching section, wherein the measuring section comprises a folding roll around which the electrode body is wound and which folds the electrode body back into an arc, and a non-contact displacement meter arranged in a position opposite the electrode body folded back into an arc by the folding roll.

[0007] In the battery electrode manufacturing device according to claim 1, the electrode body transported by the transport unit is formed in a long sheet shape including a coated portion coated with an active material layer and an uncoated portion where the metal foil is exposed. The electrode body is pressed as a whole by the press unit. Furthermore, the stretching unit stretches only the uncoated portion of the electrode body. As a result, the coated portion, which is thicker in the electrode body, is stretched more in the press unit, but since only the uncoated portion is stretched by the stretching unit, the difference in elongation rate between the coated portion and the uncoated portion can be reduced.

[0008] Here, the electrode body after being stretched has a measuring unit that measures the heights of the coated and uncoated parts from a reference point, and this measuring unit includes a turn-back roll around which the electrode body is wound and turned back into an arc, and a non-contact displacement meter that is disposed in a position facing the electrode body turned back into an arc by the turn-back roll. As a result, even if the uncoated part is stretched and wavy, the part that is turned back into an arc spreads outward from the turn-back roll, so that the uncoated part is in a taut state, and the measured value by the non-contact displacement meter can be stabilized.

[0009] The battery electrode manufacturing apparatus of claim 2 is, in claim 1, characterized in that it calculates the elongation rate of the uncoated portion based on the heights of the coated portion and the uncoated portion from a reference point measured by the non-contact displacement meter, and changes the processing conditions in the extension portion according to the calculated elongation rate.

[0010] In the battery electrode manufacturing apparatus of claim 2, the processing conditions of the stretching section are changed according to the calculated elongation rate, so that the uncoated section can be stretched so that the difference in elongation rate between the coated section and the uncoated section is eliminated.

[0011] A battery electrode manufacturing apparatus according to a third aspect of the present invention is the apparatus according to the first aspect, wherein the measuring section is disposed between the stretching section and the pressing section.

[0012] In the battery electrode manufacturing apparatus according to claim 3, the amount of extension by the extension section can be accurately calculated by measuring the height of the electrode body before it is pressed by the press section.

[0013] A fourth aspect of the present invention provides the battery electrode manufacturing apparatus according to the first aspect, wherein the metal foil has a thickness of 12 to 13 μm.

[0014] In the battery electrode manufacturing apparatus according to claim 4, the thickness of the uncoated portion can be accurately measured even for a thin metal foil such as 12 to 13 μm.

[0015] The battery electrode manufacturing apparatus according to claim 5 is any one of claims 1 to 4, wherein the turn-back roll is a stepped roll in which a portion corresponding to the uncoated portion is formed with a larger diameter than a portion corresponding to the coated portion.

[0016] In the battery electrode manufacturing apparatus according to claim 5, the turn-back roll is a stepped roll, so that the uncoated portion tends to spread outward from the turn-back roll. Effect of the Invention

[0017] As described above, the battery electrode manufacturing apparatus according to the present invention can accurately calculate the difference in elongation rate between the coated portion and the uncoated portion. [Brief description of the drawings]

[0018] [Figure 1] 1 is a diagram illustrating an overall configuration of a battery electrode manufacturing apparatus according to an embodiment of the present invention; [Diagram 2]FIG. 2 is an enlarged view of a main part of a turn-back roll in the embodiment. [Diagram 3] 4 is an enlarged view of a main part of an electrode body for explaining a measurement range by a laser displacement meter. FIG. [Figure 4] 11 is a graph showing an example of a measurement result obtained by a laser displacement meter. [Diagram 5] FIG. 11 is a plan view of the electrode body after the uncoated portion is stretched. [Figure 6] 10 is a schematic cross-sectional view of a stepped roll constituting a battery electrode manufacturing apparatus according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A battery electrode manufacturing apparatus 10 according to an embodiment will be described with reference to the drawings.

[0020] (Overall configuration of battery electrode manufacturing apparatus 10) FIG. 1 is a diagram showing a schematic overall configuration of a battery electrode manufacturing apparatus 10 (hereinafter, may be simply referred to as "electrode manufacturing apparatus 10") according to an embodiment. The electrode manufacturing apparatus 10 of this embodiment is, as an example, an apparatus used in part of a manufacturing process for electrodes used in secondary batteries mounted on vehicles. For example, the electrode manufacturing apparatus 10 is an apparatus for manufacturing electrodes for lithium ion secondary batteries, but is not limited thereto, and may be an apparatus for manufacturing electrodes for other batteries.

[0021] The electrode manufacturing apparatus 10 includes a transport section 12, a stretching section 14, a measuring section 16, and a pressing section 18. In the following description, the transport direction in which the electrode body W is transported is referred to as the downstream side of the transport direction. Also, the side opposite to the transport direction of the electrode body W is referred to as the upstream side of the transport direction.

[0022] The conveying section 12 is composed of a first tension control dancer 12A and a second tension control dancer 12B, and conveys a long sheet-like electrode body W including a coated section coated with an active material layer and an uncoated section where the metal foil is exposed.

[0023] FIG. 5 is a plan view of the electrode body after the uncoated portion is stretched. As shown in FIG. 5, the electrode body W is formed by coating an active material layer on a long, thin metal foil, and the portion coated with the active material layer becomes the coated portion 50. The coated portion 50 is provided in the center portion in the width direction of the electrode body W. In addition, in the electrode body W, the portion other than the coated portion 50 becomes the uncoated portion 52 where the metal foil is exposed, and in FIG. 5, since only the uncoated portion 52 is in a state after being stretched, the uncoated portion 52 is wavy. In this embodiment, as an example, the thickness of the uncoated portion 52 where the metal foil is exposed is set to 12 to 13 μm, but is not limited thereto.

[0024] Here, the electrode manufacturing apparatus 10 of this embodiment is an apparatus for manufacturing an electrode body of a bipolar electrode, and the electrode body W has active material layers coated on both sides of a metal foil. That is, when the coated portion 50 in Fig. 5 is a portion coated with a positive electrode active material layer, a coated portion coated with a negative electrode active material layer is provided on the back surface of the electrode body W. The materials of the uncoated portion 52 and the coated portion 50 are appropriately selected depending on the type of battery, etc.

[0025] The first tension control dancer 12A and the second tension control dancer 12B shown in Figure 1 are each equipped with a dancer roll not shown, and are configured to move in accordance with the tension acting on the electrode body W during transport, thereby maintaining a constant tension acting on the electrode body W.

[0026] The first tension control dancer 12A is located at the most upstream side in the conveying direction in the electrode manufacturing apparatus 10, and upstream of the first tension control dancer 12A in the conveying direction, for example, the electrode body W is set on a supply side roller in a rolled state.

[0027] A stretching section 14 is disposed downstream in the conveying direction of the first tension control dancer 12A. The stretching section 14 includes an upper stretching roll 20, a lower stretching roll 22, a pressure sensor 24, a lifting mechanism 26, and a drive motor 28.

[0028] The upper stretching roll 20 is located above the electrode body W being transported, and is configured to be movable up and down by a lifting mechanism 26. In addition, the upper stretching roll 20 is provided with a pressure sensor 24, and is configured to be able to measure the pressure applied by the upper stretching roll 20.

[0029] The lower stretching roll 22 is located below the electrode body W being transported, and is in contact with the lower surface of the electrode body W. The lower stretching roll 22 is configured to receive power from a drive motor 28, and when the drive motor 28 is operated, the lower stretching roll 22 rotates and the electrode body W is transported in the transport direction.

[0030] Here, the upper stretching roll 20 and the lower stretching roll 22 are configured to contact only the uncoated portion 52 of the electrode body W. Therefore, by pressing the upper stretching roll 20 toward the lower stretching roll 22, only the uncoated portion 52 is stretched.

[0031] The stretching section 14 is configured as described above, and in the stretching section 14, only the uncoated section 52 of the electrode body W is stretched. A measuring section 16 is disposed downstream in the conveying direction of the stretching section 14. Details of the measuring section 16 will be described later, but the measuring section 16 is configured to measure the heights of the coated section 50 and the uncoated section 52 from a reference point in the electrode body W after it has been stretched in the stretching section 14.

[0032] A second tension control dancer 12B is disposed downstream in the conveying direction of the measuring section 16, and a press section 18 is disposed downstream in the conveying direction of the second tension control dancer 12B.

[0033] The press unit 18 presses the entire electrode body W. Specifically, the press unit 18 is configured to include a pair of upper and lower press rolls (not shown), and the electrode body W is sandwiched between the press rolls and pressed as it passes between the press rolls. For this reason, in the press unit 18, a compressive load acts intensively on the thick coated portion 50, causing the coated portion 50 to be stretched.

[0034] Only the uncoated portion 52 is stretched in the stretching section 14, and the coated portion 50 is stretched in the press section 18, thereby reducing the difference in elongation rate between the coated portion 50 and the uncoated portion 52 and eliminating waviness.

[0035] Here, the flow of data is indicated by dashed lines in Fig. 1. Specifically, data on the rotation speed is transmitted from the press unit 18 to the drive motor 28. In addition, data on the elongation rate of the coated unit 50 is output from the press unit 18, and data on the elongation rate of the uncoated unit 52 is output from the measurement unit 16. Based on these elongation rate data, a signal for changing the set value is transmitted to the pressure sensor 24. The pressure sensor 24 provides feedback to the lifting mechanism 26 so as to press with the pressure of the changed set value. In this way, the elongation rate of the uncoated unit 52 is calculated based on the heights of the coated unit 50 and the uncoated unit 52 from the reference point, and the processing conditions in the stretching unit 14 are changed according to the calculated elongation rate R.

[0036] (Configuration of measurement unit 16) Next, a detailed description will be given of the measurement section 16. The measurement section 16 of this embodiment is disposed between the stretching section 14 and the pressing section 18, and includes a first conveying roll 30, a second conveying roll 32, a turn-back roll 34, and a measurement unit 36.

[0037] The first transport roll 30 is located upstream of the turn-back roll 34 in the transport direction, and the second transport roll 32 is located downstream of the turn-back roll 34 in the transport direction. Therefore, the turn-back roll 34 is disposed between the first transport roll 30 and the second transport roll 32, and the turn-back roll 34 is disposed above the first transport roll 30 and the second transport roll 32. The electrode body W passes under the first transport roll 30, extends upward, hangs over the upper part of the turn-back roll 34, is turned downward, and passes under the second transport roll 32.

[0038] 2 is an enlarged view of a main part of the folding roll 34 in this embodiment. As shown in Fig. 2, the folding roll 34 around which the electrode body W is wound and which folds the electrode body W back in an arc shape is provided, and a laser displacement meter 38 as a non-contact displacement meter is provided at a position facing the electrode body W folded back in an arc shape by the folding roll 34.

[0039] Here, the uncoated portion 52 is wavy and therefore has a generally wavy shape in side view, but in the portion folded back by the turn-back roll 34, a compressive force acts on the metal foil on the inner diameter side, and as a result, the uncoated portion 52 is deformed by elastic force so as to spread toward the outer periphery side of the turn-back roll 34. Therefore, in the portion folded back by the turn-back roll 34, the wavy shape of the uncoated portion 52 is eliminated and the uncoated portion 52 has a generally arc shape in side view.

[0040] The laser displacement meter 38 is disposed facing the turn-back roll 34, and configured to irradiate the laser light LB to the portion where the electrode body W is turned back. The laser displacement meter 38 is configured to measure the height of the coated portion 50 and the uncoated portion 52 of the electrode body W from a reference point, and the measurement data is transmitted to the control unit of the measurement unit 36.

[0041] 3 is an enlarged view of a main part of the electrode body W for explaining the measurement range by the laser displacement meter 38. As shown in FIG. 3, the laser displacement meter 38 measures the height of a predetermined range including the electrode body W and the folding roll 34.

[0042] FIG. 4 is a graph showing an example of the measurement results obtained by the laser displacement meter 38. In the graph of FIG. 4, the two-dot chain line L a shows the measurement results of the coating part 50, and the solid line L b The dashed line L indicates the measurement result of the height of the uncoated portion 52. r 1 shows the measurement result of the turn-back roll 34. In the measurement section 16, the height of the turn-back roll 34 is set as a reference point, and the height h of the coating section 50 from this reference point to the coating section 50 is calculated. aIn the measurement section 16, the height of the return roll 34 is set as a reference point, and the height from this reference point to the uncoated section 52 is defined as the height h b It states that:

[0043] (action) Next, the operation of the battery electrode manufacturing apparatus 10 according to this embodiment will be described.

[0044] In the battery electrode manufacturing apparatus 10 according to this embodiment, as shown in FIG. 5, the electrode body W transported by the transport unit 12 is formed in a long sheet shape including a coated portion 50 coated with an active material layer and an uncoated portion 52 where the metal foil is exposed. Also, as shown in FIG. 1, the electrode body W is pressed as a whole by the press unit 18. Furthermore, the stretching unit 14 stretches only the uncoated portion 52 in the electrode body W. As a result, the press unit 18 stretches the thick coated portion 50 in the electrode body W more, but since the stretching unit 14 stretches only the uncoated portion 52, the difference in elongation rate between the coated portion 50 and the uncoated portion 52 can be reduced.

[0045] In this embodiment, the electrode body W after being stretched by the stretching section 14 has a measuring section 16 that measures the heights of the coated section 50 and the uncoated section 52 from a reference point. As shown in FIG. 2, the measuring section 16 includes a turn-back roll 34 around which the electrode body W is wound and which turns the electrode body W back in an arc shape, and a laser displacement meter 38 disposed at a position facing the electrode body W turned back in an arc shape by the turn-back roll 34. As a result, even if the uncoated section 52 is stretched and wavy, the part that is turned back in an arc shape spreads outward from the turn-back roll 34, so that the uncoated section 52 is in a taut state, and the measured value of the laser displacement meter 38 can be stabilized. As a result, the difference in the elongation rate between the coated section 50 and the uncoated section 52 can be accurately calculated. This action will be described together with a method for calculating the elongation rate.

[0046] (How to calculate the elongation rate) First, a method for calculating the elongation rate in the comparative example will be described. As shown in FIG. 5, in an electrode body W being transported horizontally, the length L of the coated portion 50 per a given transport distance is calculated as a is close to the conveying distance, but since the uncoated portion 52 is wavy, the length L of the uncoated portion 52 per a given conveying distance b is longer than the conveying distance. Therefore, the elongation rate R is calculated by the following formula.

[0047]

number

[0048] In the comparative example, the height of the coated portion 50 and the uncoated portion 52 is measured for a predetermined time to calculate the elongation rate R. Specifically, the conveying distance per unit time in the coated portion 50 is Δx a , the change in height is Δy a The conveying distance per unit time in the uncoated area 52 is Δx b , the change in height is Δy b In this case, the length of the coating part 50 is L a and the length L of the uncoated portion 52 b is calculated using the following formula:

[0049]

number

[0050]

number

[0051] By substituting the formulas (2) and (3) into the formula (1), the elongation rate R is calculated as shown in the following formula.

[0052]

number

[0053] For example, the measurement value of the elongation rate R is a cumulative average of 10 cm, and is measured at a measurement pitch of 16.6 μm.

[0054] However, in the calculation method of the comparative example, since the uncoated portion 52 is measured in a wavy state, there is room for improvement in order to calculate the elongation rate R stably and accurately.

[0055] In this embodiment, as shown in Fig. 2, the heights of the coated portion 50 and the uncoated portion 52 are measured at the portion folded back by the turn-back roll 34, so that the elongation rate R can be calculated more stably and accurately than in the comparative example. Specifically, in this embodiment, the radius of the turn-back roll 34 is defined as r, and the thickness of the coated portion 50 based on the turn-back roll 34 is defined as h a The thickness of the uncoated portion 52 based on the return roll 34 is h b In this case, the elongation rate R can be calculated using the following formula.

[0056]

number

[0057] The above formula (5) can be rearranged to obtain the following formula.

[0058]

number

[0059] As shown in the above formula (6), in this embodiment, the elongation rate R is expressed by the radius of the return roll 34 being r, the thickness of the coating portion 50 being h a , and the thickness of the uncoated portion 52 is h b It can be calculated only by

[0060] As another calculation method, the elongation rate R may be calculated from the above formula (4). That is, Δx a and Δx bThe ratio can be calculated as follows: In the following formula, Ta is the value obtained by dividing the thickness of the coated portion 50 by 2, and Tb is the value obtained by dividing the thickness of the uncoated portion 52 by 2.

[0061]

number

[0062] From equation (7), Δx b is expressed as follows:

[0063]

number

[0064] By substituting equation (8) into equation (4), the elongation rate R can be calculated as follows.

[0065]

number

[0066] Furthermore, in this embodiment, by changing the processing conditions of the stretching section 14 according to the calculated elongation rate R, it is possible to stretch the uncoated section 52 so as to eliminate the difference in elongation rate between the coated section 50 and the uncoated section 52. Note that the processing conditions referred to here are conditions such as the lifting position and pressure of the lifting mechanism 26 and the rotation speed of the drive motor 28, for example.

[0067] Furthermore, in this embodiment, by measuring the height of the electrode body W by the measuring unit 16 before the electrode body W is pressed by the pressing unit 18, the amount stretched by the stretching unit 14 can be accurately calculated. Furthermore, even if the uncoated portion 52 is a thin metal foil such as 12 to 13 μm, the thickness of the uncoated portion 52 can be accurately measured by measuring the portion folded back by the folding roll 34.

[0068] In this embodiment, the outer shape of the turn-back roll 34 is substantially uniform in the axial direction, but is not limited to this. For example, a modified structure shown in FIG. 6 may be adopted.

[0069] (Modification) 6 is a schematic cross-sectional view of a turn-up roll constituting a battery electrode manufacturing apparatus according to a modified example. As shown in FIG. 6, the turn-up roll of this modified example is a stepped roll 62 including a small diameter portion 62A and a large diameter portion 62B.

[0070] The small diameter portion 62A of the stepped roll 62 is a cylindrical portion formed to have approximately the same diameter as the turn-back roll 34 of this embodiment, and corresponds to the coating portion 50 of the electrode body W. In addition, large diameter portions 62B are provided at both axial ends of the small diameter portion 62A.

[0071] Each of the large diameter portions 62B of the stepped roll 62 is formed to have a larger diameter than the small diameter portion 62A, and the peripheral surface of the large diameter portion 62B is formed in a tapered shape that gradually becomes smaller in diameter toward the small diameter portion 62A side. The axially inner end of the large diameter portion 62B is connected to the small diameter portion 62A without any step.

[0072] Here, the large diameter portion 62B corresponds to the uncoated portion 52 of the electrode body W. Thus, in this deformation meter, the stepped roll 62 is formed with a larger diameter in the portion corresponding to the uncoated portion 52 than in the portion corresponding to the coated portion 50.

[0073] According to this modification, by using the stepped roll 62 as the turn-back roll, the uncoated portion 52 is more likely to spread outward along the large diameter portion 62B.

[0074] Although the battery electrode manufacturing apparatus 10 according to the present invention has been described above, it is needless to say that the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. For example, in the above embodiment, the measuring unit 16 is disposed between the stretching unit 14 and the pressing unit 18, but the present invention is not limited to this, and a measuring unit that measures the elongation rate of the electrode body W may be disposed after the pressing unit 18.

[0075] In the above embodiment, the laser displacement meter 38 is used as the non-contact displacement meter, but the present invention is not limited to this and other non-contact displacement meters may be used. For example, a non-contact displacement meter based on the principle of an optical type, an eddy current type, an ultrasonic type, or the like may be used.

[0076] Regarding the above embodiment, the following notes are disclosed. (Appendix 1) a conveying section that conveys a long sheet-like electrode body including a coated section coated with an active material layer and an uncoated section where the metal foil is exposed; A press unit that presses the entire electrode body; an extension portion that extends only the uncoated portion of the electrode body; a measuring unit that measures heights of the coated portion and the uncoated portion from a reference point in the electrode body after it has been stretched by the stretching unit; having The measurement unit includes a folding roll around which the electrode body is wound and which folds the electrode body in an arc shape, and a non-contact displacement meter disposed at a position facing the electrode body folded in an arc shape by the folding roll. Battery electrode manufacturing equipment. (Appendix 2) calculating an elongation rate of the uncoated portion based on the heights of the coated portion and the uncoated portion from a reference point measured by the non-contact displacement meter; changing processing conditions in the stretching section according to the calculated elongation rate; 2. A battery electrode manufacturing apparatus according to claim 1. (Appendix 3) 3. The battery electrode manufacturing apparatus according to claim 1, wherein the measuring section is disposed between the stretching section and the pressing section. (Appendix 4) 4. The battery electrode manufacturing apparatus according to any one of claims 1 to 3, wherein the metal foil has a thickness of 12 to 13 μm. (Appendix 5) 5. The battery electrode manufacturing apparatus according to any one of claims 1 to 4, wherein the turn-back roll is a stepped roll in which a portion corresponding to the uncoated portion is formed with a larger diameter than a portion corresponding to the coated portion. (Appendix 6) A step of transporting a long sheet-like electrode body including a coated portion coated with an active material layer and an uncoated portion where the metal foil is exposed; stretching only the uncoated portion of the electrode body; pressing the entire electrode body; measuring the heights of the coated portion and the uncoated portion from a reference point in the electrode body after being stretched; having When measuring the height of the electrode body, the electrode body is folded in an arc shape by wrapping it around a folding roll, and the height of the folded part is measured with a non-contact displacement meter. A method for manufacturing electrodes for batteries. [Explanation of symbols]

[0077] 10 Battery electrode manufacturing equipment 12 Conveyor section 14 Stretching section 16 Measuring part 18 Press Department 34 Folding roll 38 Laser Displacement Meter 50 Coating Department 52 Uncoated area 62 Stepped Roll W electrode body

Claims

1. a conveying section that conveys a long sheet-like electrode body including a coated section coated with an active material layer and an uncoated section where the metal foil is exposed; A press unit that presses the entire electrode body; an extension portion that extends only the uncoated portion of the electrode body; a measuring unit that measures the heights of the coated portion and the uncoated portion from a reference point in the electrode body after it has been stretched by the stretching unit; having The measurement unit includes a folding roll around which the electrode body is wound and which folds the electrode body in an arc shape, and a non-contact displacement meter disposed at a position facing the electrode body folded in an arc shape by the folding roll. Battery electrode manufacturing equipment.

2. calculating an elongation rate of the uncoated portion based on the heights of the coated portion and the uncoated portion from a reference point measured by the non-contact displacement meter; changing processing conditions in the stretching section according to the calculated elongation rate; The battery electrode manufacturing apparatus according to claim 1 .

3. 2. The battery electrode manufacturing apparatus according to claim 1, wherein the measuring section is disposed between the stretching section and the pressing section.

4. 2. The battery electrode manufacturing apparatus according to claim 1, wherein the metal foil has a thickness of 12 to 13 μm.

5. The battery electrode manufacturing apparatus according to any one of claims 1 to 4, wherein the turn-back roll is a stepped roll in which a portion corresponding to the uncoated portion is formed with a larger diameter than a portion corresponding to the coated portion.

Images