JP2024011691A - Manufacturing method of electrode sheet, and manufacturing device of electrode sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode sheet, by which the reduction in the peeling strength between an electrode layer and a collector sheet can be suppressed.

SOLUTION: A method for manufacturing an electrode sheet comprises the steps of: preparing a coating sheet on which coating parts 2a, 2b and an un-coating part 3a are alternately arranged on a collector sheet 1; and irradiating the coating sheet with laser light from a plurality of laser heads L1, L2 to dry the coating parts while conveying the coating sheet. In the drying step, while sensing a position or positions of the coating parts or the un-coating part of the coating sheet, laser light radiated from the respective laser heads is controlled by turning OFF from ON when the requirement (i) is satisfied, and turning ON from OFF when the requirement (ii) is satisfied. The requirement (i) is a rate of a width of the un-coating part which enters a laser light irradiation region to a width of the laser light irradiation region is 20% or more and 80% or less. The requirement (ii) is a rate of a width of the coating part which enters a laser light irradiation scheduling region to a width of the laser light irradiation scheduling region is 20% or more and 80% or less.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a method for manufacturing an electrode sheet and an apparatus for manufacturing an electrode sheet.

As a technology related to the manufacturing method of electrode sheets used for manufacturing batteries such as lithium ion secondary batteries, electrode material is applied to the current collector sheet being transported to form a coated area, and the coated area is dried. A method for obtaining an electrode layer is known.

For example, Patent Document 1 describes a coating process in which an active material mixture is applied to a long metal foil to be transported to form a coated part of the active material mixture, and a coating process that is performed before the coating process. A first irradiation step of irradiating a laser to an irradiation position of the long metal foil located upstream in the transport direction of the long metal foil from both ends of the mixture application location along the transverse direction of the long metal foil. A second irradiation step is executed after the first irradiation step and irradiates the laser to both edges in the transverse direction of the coated portion formed by the coating step; A method for manufacturing an electrode is disclosed, which comprises a drying step of drying a working part. Further, Patent Document 1 describes that a coated portion is formed into a long metal foil by intermittent coating.

JP2019-029256A

When a coated part of the electrode material is formed by intermittent coating on the current collector sheet being conveyed, the coated part where the electrode material is coated and the uncoated part where the electrode material is not coated. A coated sheet is obtained in which these are alternately formed along the conveyance direction. The state of the coating film may be different at the ends of the coated portion of the electrode material than at the center of the coated portion. For example, the thickness of the end portion of the coated portion tends to be thinner than the thickness of the center portion of the coated portion. When a coated portion of an electrode material is formed by intermittent coating, the influence of such a difference in thickness between the end portion of the coated portion and the center portion of the coated portion becomes significant.

One method for drying electrode materials is to use a lamp as a heat source. Since the lamp is a diffused heat source, it evenly irradiates the surface of the coated sheet. Therefore, when irradiated with a lamp, the edges of the coated area tend to dry out excessively, the current collector sheet near the edges of the coated area becomes hot, and the peel strength between the electrode layer and the current collector sheet decreases. Cheap. In addition, since the startup time of the lamp is from several seconds to several tens of seconds, it is difficult to control ON/OFF of the lamp depending on the position of the intermittently arranged coating parts.

The present disclosure has been made in view of the above circumstances, and its main purpose is to provide a method for manufacturing an electrode sheet that can suppress a decrease in peel strength between an electrode layer and a current collector sheet. .

[1]
On the first surface of the current collector sheet having a longitudinal direction in the first direction, a coated part coated with an electrode material and an uncoated part not coated with the electrode material are arranged in the first direction. a preparation step of preparing coating sheets arranged alternately along the
a drying step of drying the coated portion by irradiating the coated sheet with laser light from a plurality of laser heads while conveying the coated sheet in the first direction;
In the drying step, while detecting the position of the coated part or the uncoated part of the coated sheet, the laser light emitted from each laser head is turned from ON to OFF at the time of (i) below. A method for manufacturing an electrode sheet, which is controlled by switching and switching from OFF to ON at the time of (ii) below.
(i) When the ratio of the width of the uncoated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in the first direction satisfies 20% or more and 80% or less; (ii) When the ratio of the width of the coated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in one direction satisfies 20% or more and 80% or less;

[2]
The method for producing an electrode sheet according to [1], wherein in the drying step, the position of the coated portion or the uncoated portion of the coated sheet is detected by a laser displacement meter or an image inspection device.

[3]
The method for producing an electrode sheet according to [1] or [2], wherein the laser light is irradiated such that the width of the laser light irradiation area and the width of the laser light irradiation planned area are 10 cm or more and 40 cm or less.

[4]
On the first surface of the current collector sheet having a longitudinal direction in the first direction, a coated part coated with an electrode material and an uncoated part not coated with the electrode material are arranged in the first direction. An electrode sheet manufacturing device that manufactures an electrode sheet by drying coated sheets arranged alternately along the
a conveyor for conveying the coated sheet in the first direction;
a laser beam irradiation machine comprising a plurality of laser heads that irradiates the coated sheet with laser light;
a position detector that detects the position of the coated portion or the uncoated portion of the coated sheet;
Based on the position information acquired by the position detector, the laser light emitted from each laser head is switched from ON to OFF in the following (i), and from OFF to ON in the following (ii). An electrode sheet manufacturing apparatus, comprising: a control device that controls the laser beam irradiation machine so as to switch the laser beam irradiation machine.
(i) When the ratio of the width of the uncoated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in the first direction satisfies 20% or more and 80% or less; (ii) When the ratio of the width of the coated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in one direction satisfies 20% or more and 80% or less;

[5]
The electrode sheet manufacturing apparatus according to [4], wherein the position detector is a laser displacement meter or an image inspection device.

According to the method for manufacturing an electrode sheet in the present disclosure, it is possible to manufacture an electrode sheet in which deterioration in peel strength between an electrode layer and a current collector sheet is suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view and a schematic cross-sectional view illustrating a coated sheet in the present disclosure. It is a schematic sectional view explaining the drying process in this indication. FIG. 2 is a schematic cross-sectional view illustrating an electrode sheet in the present disclosure.

Hereinafter, a method for manufacturing an electrode sheet and an apparatus for manufacturing an electrode sheet in the present disclosure will be described in detail using the drawings. Each figure shown below is shown schematically, and the size and shape of each part are appropriately exaggerated for easy understanding. In addition, in this specification, when expressing the manner in which another member is arranged with respect to a certain member, when it is simply expressed as "above" or "below", unless otherwise specified, the term "above" or "below" refers to the arrangement of another member in contact with a certain member. This includes both a case where another member is placed directly above or below a certain member, and a case where another member is placed above or below a certain member via another member.

A. Method for manufacturing an electrode sheet FIG. 1(a) is a schematic plan view illustrating a coated sheet prepared in a preparation step in the present disclosure, and FIG. 1(b) is a sectional view taken along line AA in FIG. 1(a). be. As shown in FIGS. 1(a) and 1(b), the coated sheet 10 is a coated sheet in which an electrode material is coated on a first surface S1 of a current collector sheet 1 having a longitudinal direction in a first direction D1. The portions 2 and uncoated portions 3 to which no electrode material is coated are alternately arranged along the first direction D1.

FIG. 2 is a schematic cross-sectional view illustrating the drying process in the present disclosure. As shown in FIG. 2, in the drying process, the coating sheet 10 is irradiated with laser light as a heat source from a plurality of laser heads L1 and L2 while the coating sheet 10 is being conveyed in the first direction D1. Thereby, the coated part 2 is dried and an electrode layer is obtained. In the drying process, while detecting the position of the coated part 2 or uncoated part 3 of the coated sheet 10 by the position detector Z, the laser light irradiated from each laser head is directed in (i) the first direction D1. Switch from ON to OFF when the ratio of the width W _α of the uncoated portion 3 that has entered the laser beam irradiation area to the width W ₀ of the laser beam irradiation area satisfies 20% or more and 80% or less (Fig. 2(a) and Figure 2(b)). Furthermore, the laser beam irradiated from each laser head is determined by (ii) the ratio of the width W β of the coating portion 2 that has entered the laser beam irradiation area to the width W ₀ of the laser beam irradiation area in the first direction _D1 ; is 20% or more and 80% or less, the laser beam is switched from OFF to ON (FIGS. 2(c) and 2(d)).

According to the present disclosure, in the drying process of a coated sheet, while detecting the position of the coated part or the uncoated part, the laser light irradiated from each laser head is turned on and off at a timing that satisfies a predetermined range. By switching from OFF to ON at a timing that satisfies a predetermined range, it is possible to suppress over-drying of the end portion of the coated portion while suppressing insufficient drying of the coated portion. Therefore, it is possible to suppress the current collector sheet near the end of the coated portion from becoming high temperature, and it is possible to manufacture an electrode sheet in which deterioration in peel strength between the electrode layer and the current collector sheet is suppressed. In addition, oxidation caused by the current collector sheet being heated to a high temperature can be suppressed.

1. Preparation Step As shown in FIG. 1, the preparation step in the present disclosure includes coating part 2 coated with an electrode material on first surface S1 of a current collector sheet having a longitudinal direction in first direction D1; This is a step of preparing a coated sheet in which uncoated parts 3 to which no material is coated are arranged alternately along the first direction D1.

The current collector sheet has a longitudinal direction in the first direction. The current collector sheet has a first surface S1, which is one surface in the thickness direction, and a second surface S2, which is the back surface of the first surface S1. The current collector sheet is preferably used as a current collector such as a negative electrode current collector, a positive electrode current collector, and a bipolar current collector. As the current collector sheet, for example, metal foil such as aluminum, copper, SUS, nickel, etc. is used. The thickness of the current collector sheet is, for example, 0.1 μm or more, and may be 1 μm or more. On the other hand, the thickness of the current collector sheet is, for example, 1 mm or less, and may be 100 μm or less.

The electrode material may be a negative electrode material (material of the negative electrode active material layer). The negative electrode material includes, for example, a negative electrode active material, a conductive material, a binder, and a solvent. Further, the electrode material may be a positive electrode material (material of the positive electrode active material layer). The positive electrode material includes, for example, a positive electrode active material, a conductive material, a binder, and a solvent. These materials are not particularly limited, and known materials can be used.

The method for preparing the coated sheet is not particularly limited, but for example, the electrode material may be intermittently coated on the first surface of the current collecting sheet using a coating machine while the current collecting sheet is transported in the first direction using a transporting machine. It can be made. Further, it is preferable that the coating machine be disposed upstream of a position detector and a laser beam irradiation machine, which will be described later, in the transport direction (first direction), and perform this step and a drying step, which will be described later, in succession.

2. Drying Step The drying step in the present disclosure is a step of drying the coated portion by irradiating the coated sheet with laser light from a plurality of laser heads while conveying the coated sheet in the first direction.

In the drying process, the coated sheet is conveyed in the first direction, that is, the longitudinal direction of the coated sheet. For example, in FIGS. 2(a) to 2(d), the object is conveyed from the left side of the drawing toward the right side of the drawing. The conveyance speed of the coated sheet is, for example, constant. By conveying the coating sheet 10 and passing it under the plurality of laser heads L1 and L2, the coating sheet 10 is irradiated with laser light as a heat source from each of the laser heads L1 and L2.

It is preferable that the plurality of laser heads are arranged in a line above the coated sheet being conveyed at intervals along the first direction. The above-mentioned interval (distance between adjacent laser heads) may be the same or different. A laser head usually includes an optical lens (not shown) having a predetermined curvature. Further, the laser head is oscillated by a laser oscillator (not shown) and irradiates the coated sheet with laser light through an optical lens.

In this step, the laser beam is switched ON/OFF at a predetermined timing while detecting the positions of the coated portion and uncoated portion of the coated sheet using a position detector. Examples of the position detector that detects the position of the coated portion or uncoated portion of the coated sheet include a laser displacement meter and an image inspection device.

The ON/OFF timing of the laser beam in this step will be described using as an example the case where the coated parts 2a, 2b and the uncoated part 3a pass below the laser head L1 in FIG. 2. As shown in FIGS. 2(a) and 2(b), the ratio of the width W _α of the uncoated portion 3a that has entered the laser beam irradiation area to the width W ₀ of the laser beam irradiation area of the laser head L1 is as follows: When 20% or more and 80% or less are satisfied, the laser beam irradiated from the laser head L1 is switched from ON to OFF. Note that the laser beam irradiation area is a laser beam irradiation area (laser spot) on the current collector sheet. Moreover, the above-mentioned "width W _α of the uncoated part 3a that has entered the laser beam irradiation area" is determined by, for example, the conveyance speed of the coated sheet and the detection of the end of the uncoated part 3a by the position detector Z. It can be determined by considering the elapsed time since then.

In this way, by switching off the laser beam at the timing when the ratio (W _α /W ₀ ) becomes equal to or greater than a predetermined value, the coated portion 2b can be sufficiently dried. On the other hand, by switching the laser beam to OFF at the timing when the ratio (W _α /W ₀ ) becomes equal to or less than a predetermined value, for example, the timing at which the end portion _ET of the coating portion 2b exits from the laser beam irradiation area can be set. The laser beam can be switched off more quickly than the above, and the laser beam irradiation to the terminal end _ET of the coating section 2b can be made shorter. Thereby, overdrying due to excessive laser irradiation can be suppressed at the terminal end _ET of the coating section 2b. Further, the terminal end portion _ET of the coated portion 2b can be sufficiently dried by residual heat. Note that the terminal end of the coating section is the upstream end of the coating section in the conveyance direction (first direction).

In this step, as shown in FIGS. 2(c) and 2(d), the laser beam irradiation area is adjusted to the width W ₀ of the laser beam irradiation area of the laser head L1 in the first direction D1. The laser beam is switched from OFF to ON when the ratio of the width W _β of the coated portion 2a entered satisfies 20% or more and 80% or less. Note that the laser beam irradiation area is a laser beam irradiation area (laser spot) on the current collector sheet, and usually has the same width as the laser beam irradiation area. Moreover, the above-mentioned "width W _β of the coated portion that has entered the area to be irradiated with the laser beam" is, in other words, the width of the coated portion that is irradiated with the laser beam if the laser beam is in an ON state. This can be determined, for example, by considering the conveyance speed of the coated sheet and the elapsed time since the end of the coated portion was detected by the position detector Z.

In this way, by switching the laser beam ON at the timing when the ratio (W _β /W ₀ ) becomes equal to or higher than a predetermined value, for example, the starting end E _B of the coating portion 2a enters the area scheduled for laser beam irradiation. Since the laser beam is switched on later than the timing, the laser beam irradiation to the starting end _EB of the coating section 2a can be made short. Thereby, overdrying due to excessive laser irradiation can be suppressed at the starting end _EB of the coating section 2a. On the other hand, by switching on the laser beam at the timing when the ratio (W _β /W ₀ ) becomes equal to or less than a predetermined value, the coated area can be sufficiently dried.

As shown in FIG. 1(a), in the first direction _D1 , the width of the coated part 2 is _W2 , and the width of the uncoated part 3 is _W3 . The ratio (W ₀ /W ₂ ) (%) of the width W ₀ of the laser beam irradiation area to the width W ₂ of the coating part 2 in the first direction is, for example, 1% or more, and even if it is 20% or more. good. On the other hand, the ratio (W ₀ /W ₂ ) (%) is, for example, 100% or less, and may be 80% or less.

Further, the ratio (W ₀ /W ₃ ) (%) of the width W ₀ of the laser beam irradiation area to the width W ₃ of the uncoated portion 3 in the first direction is, for example, 0.1% or more, and 10%. It may be more than that. On the other hand, the ratio (W ₀ /W ₃ ) (%) is, for example, 60% or less, and may be 50% or less.

The width W ₀ of the laser beam irradiation area in the first direction and the width W ₀ of the laser beam irradiation planned area are, for example, 5 cm or more, may be 10 cm or more, or may be 20 cm or more. On the other hand, W ₀ is, for example, 50 cm or less, and may be 40 cm or less.

The energy density of the laser light irradiated from the laser head to the coated sheet is, for example, 0.1 W/cm ² or more, and may be 0.2 W/cm ² or more. On the other hand, the energy density is, for example, 1.0 W/cm ² or less, and may be 0.5 W/cm ² or less.

3. Other steps The method for manufacturing an electrode sheet according to the present disclosure includes forming a coated area coated with an electrode material and an uncoated area not coated with an electrode material on the second surface of the current collector sheet. It may also include a coating step in which the layers are formed alternately along one direction. In this case, it is preferable to form the coated part on the second surface at a position overlapping with the coated part on the first surface in plan view. Furthermore, after the coating step, a drying step may be included to dry the coated portion on the second surface. In this case, it is preferable that the second surface side of the current collector sheet is also irradiated with laser light in the same manner as the first surface side.

The method for manufacturing an electrode sheet in the present disclosure may include a pressing step of pressing the electrode sheet in the thickness direction. Through the pressurizing process, the electrode layer is brought into pressure contact with the current collector sheet.

4. Electrode Sheet FIG. 3 is a schematic cross-sectional view showing an example of an electrode sheet manufactured in the present disclosure. As shown in FIG. 3A, the electrode sheet 20 includes a current collector sheet 1 and an electrode layer 4 intermittently formed on the first surface S1 of the current collector sheet 1. Further, the electrode sheet 20 may have an electrode layer 5 intermittently formed on the second surface S2 of the current collector sheet 1. That is, as shown in FIG. 3(b), the electrode sheet may have electrode layers 4 and 5 on both the first and second surfaces of the current collector sheet.

Such an electrode sheet is used in the manufacture of batteries, and may be an electrode sheet on the positive electrode side or an electrode sheet on the negative electrode side. When the electrode sheet in the present disclosure is a positive electrode sheet, it is combined with a negative electrode sheet and a separator to form an electrode body. Similarly, when the electrode sheet in the present disclosure is a negative electrode sheet, it is combined with a positive electrode sheet and a separator to form an electrode body. Moreover, the electrode layer 4 shown in FIG. 3(a) may be a positive electrode active material layer or a negative electrode active material layer. The electrode layer 4 and the electrode layer 5 shown in FIG. 3(b) may both be positive electrode active material layers, or both may be negative electrode active material layers, one being the positive electrode active material layer and the other being the negative electrode active material layer. It may be a material layer.

Although the type of battery in which the electrode body is used is not particularly limited, examples include lithium ion secondary batteries. Applications of batteries include, for example, power sources for vehicles such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), electric vehicles (BEV), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a power source for driving a hybrid vehicle (HEV), plug-in hybrid vehicle (PHEV), or electric vehicle (BEV). Batteries may also be used as a power source for moving objects other than vehicles (for example, trains, ships, and airplanes), and may be used as a power source for electrical products such as information processing devices.

B. Electrode Sheet Manufacturing Apparatus The electrode sheet manufacturing apparatus according to the present disclosure includes a coated part coated with an electrode material on a first surface of a current collector sheet having a longitudinal direction in a first direction, and a coated part coated with an electrode material. An electrode sheet manufacturing apparatus for manufacturing an electrode sheet by drying a coated sheet in which uncoated parts and uncoated parts are alternately arranged along the first direction, a conveying machine for conveying in a first direction; a laser beam irradiation machine including a plurality of laser heads for irradiating the coated sheet with laser beams; Based on the position detector that detects the position and the position information acquired by the position detector, the laser light emitted from each of the laser heads is switched from ON to OFF at the time of (i) below, and the following ( and a control device that controls the laser beam irradiation device to switch from OFF to ON at the time of ii).
(i) When the ratio of the width of the uncoated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in the first direction satisfies 20% or more and 80% or less; (ii) When the ratio of the width of the coated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in one direction satisfies 20% or more and 80% or less;

According to the electrode sheet manufacturing apparatus of the present disclosure, it is possible to manufacture an electrode sheet in which deterioration in peel strength between an electrode layer and a current collector sheet is suppressed.

The conveyance machine in the present disclosure is not particularly limited as long as it is capable of conveying the coated sheet, and includes, for example, a conveyance roller. The laser beam irradiation machine includes a plurality of the laser heads described above. The number of laser heads included in the laser beam irradiation device may be, for example, two or more, five or more, or ten or more. Furthermore, the laser beam irradiation device may include a laser oscillator. Examples of the position detector include a laser displacement meter and an image inspection device. It is preferable that the position detector is arranged upstream of the laser beam irradiation device in the transport direction (first direction).

The control device switches the laser light emitted from each laser head from ON to OFF at the time of (i) above, based on the position information of the coated part or the uncoated part acquired by the position detector, and At the time of (ii) above, the laser beam irradiation device is controlled to switch from OFF to ON. The timing of switching has been described in detail above, so the explanation here will be omitted.

Hereinafter, the present disclosure will be further explained by showing Examples and Comparative Examples.

(Example 1)
(Coated sheet preparation process)
A negative electrode material containing a negative electrode active material (graphite), a binder (styrene butadiene rubber), a conductive material (carbon nanotubes), and a thickener (carboxymethylcellulose) is placed on the first surface of a copper foil sheet having a longitudinal direction in the first direction. was applied intermittently along the first direction. As a result, coated areas coated with the negative electrode material and uncoated areas not coated with the negative electrode material were alternately arranged along the first direction on the first surface of the copper foil sheet. A coated sheet was prepared.

(drying process)
Next, the coated sheet was conveyed and passed under a plurality of laser heads to irradiate it with laser light. At this time, the timing of switching the laser beam from each laser head from ON to OFF and from OFF to ON is determined based on the position information obtained by detecting the edge of the coated part of the coated sheet with a laser displacement meter. , W _α /W ₀ and W _β /W ₀ shown in Table 1 were controlled. Further, the energy density and irradiation width of the laser beam were set to the values shown in Table 1. Specifically, in each laser head, the ratio W _α /W ₀ of the width W _α of the uncoated part entering the laser beam irradiation area to the width W ₀ of the laser beam irradiation area in the first direction is 20%. The laser beam is switched from ON to OFF at the timing of , and the ratio of the width W _β of the coated portion that has entered the area to be irradiated with the laser beam to the width W ₀ of the area to be irradiated with the laser beam in the first direction is determined W _β /W ₀ However, the laser beam was switched from OFF to ON at 20% of the time.

(Examples 2 to 8, Comparative Examples 1 to 7)
In the drying process, the energy density of the laser beam, the irradiation width, the timing of switching from ON to OFF (the above ratio W _α /W ₀ ), and the timing of switching from OFF to ON (the above ratio W _β /W ₀ ) are shown in Table 1. An electrode sheet was manufactured in the same manner as in Example 1, except for the following values.

[evaluation]
(Measurement of peel strength)
Using the electrode sheet obtained above, the electrode layer was peeled off from the copper foil sheet by a method compliant with "JIS K 6854-1 (Adhesives - Peeling adhesive strength test method - Part 1: 90 degree peeling)". The peel strength was measured. The case of 0.12 N/cm or more was evaluated as OK, and the case of less than 0.12 N/cm was evaluated as NG.

(Temperature measurement of current collector sheet)
The temperature of the current collector sheet of the electrode sheet obtained above was measured, and when it was 150°C or higher, it was evaluated as NG, and when it was lower than 150°C, it was evaluated as OK. The results are shown in Table 1.

As shown in Table 1, the ratio W _α /W ₀ of the width W _α of the uncoated area that has entered the laser beam irradiation area to the width W ₀ of the laser beam irradiation area is between 20% and 80%. The laser beam is switched from ON to OFF, and the ratio W _β /W ₀ of the width of the coated part that has entered the area to be irradiated with the laser beam to the width W 0 of the area to be irradiated with the laser _beam is 20% or more, 80%. It was confirmed that by switching the laser beam from OFF to ON during the following period, it was possible to suppress the temperature rise near the end of the coated part of the current collector sheet, and it was possible to suppress the reduction in peel strength (Example 1-8).

On the other hand, in Comparative Example 1, the irradiation time was long at the starting end of the coated area, resulting in overdrying, resulting in a decrease in peel strength. Furthermore, since the laser beam irradiation time was short at the starting end of the coated part in Comparative Example 2 and at the terminal end of the coated part in Comparative Example 3, drying was insufficient, resulting in a decrease in peel strength. In Comparative Example 4, the irradiation time was long at the end of the coated area, resulting in overdrying, resulting in a decrease in peel strength. In Comparative Example 5, the irradiation time was long at the starting end of the coated area, resulting in overdrying, resulting in a decrease in peel strength. In Comparative Example 6, the laser beam irradiation time was short at the starting end of the coated area, resulting in insufficient drying and a decrease in peel strength. In Comparative Example 7, the irradiation time was long at the starting end of the coated area, resulting in overdrying, resulting in a decrease in peel strength.

The present disclosure is not limited to the above embodiments. The above-mentioned embodiments are illustrative, and any configuration that has substantially the same technical idea as the claims of the present disclosure and provides similar effects is the present invention. within the technical scope of the disclosure.

1... Current collector sheet 2... Coated area 3... Uncoated area 10... Coated sheet 20... Electrode sheet

Claims (5)

On the first surface of the current collector sheet having a longitudinal direction in the first direction, a coated part coated with an electrode material and an uncoated part not coated with the electrode material are arranged in the first direction. a preparation step of preparing coating sheets arranged alternately along the
a drying step of drying the coated portion by irradiating the coated sheet with laser light from a plurality of laser heads while conveying the coated sheet in the first direction;
In the drying step, while detecting the position of the coated part or the uncoated part of the coated sheet, the laser light emitted from each laser head is turned from ON to OFF at the time of (i) below. A method for manufacturing an electrode sheet, which is controlled by switching and switching from OFF to ON at the time of (ii) below.
(i) When the ratio of the width of the uncoated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in the first direction satisfies 20% or more and 80% or less; (ii) When the ratio of the width of the coated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in one direction satisfies 20% or more and 80% or less; The method for manufacturing an electrode sheet according to claim 1, wherein in the drying step, the position of the coated portion or the uncoated portion of the coated sheet is detected by a laser displacement meter or an image inspection device. The method for manufacturing an electrode sheet according to claim 1 or 2, wherein the laser beam is irradiated so that the width of the laser beam irradiation area and the width of the laser beam irradiation planned area are 10 cm or more and 40 cm or less. On the first surface of the current collector sheet having a longitudinal direction in the first direction, a coated part coated with an electrode material and an uncoated part not coated with the electrode material are arranged in the first direction. An electrode sheet manufacturing device that manufactures an electrode sheet by drying coated sheets arranged alternately along the
a conveyor for conveying the coated sheet in the first direction;
a laser light irradiation machine comprising a plurality of laser heads that irradiate the coated sheet with laser light;
a position detector that detects the position of the coated portion or the uncoated portion of the coated sheet;
Based on the position information acquired by the position detector, the laser light emitted from each laser head is switched from ON to OFF at the time of (i) below, and from OFF to ON at the time of (ii) below. An electrode sheet manufacturing apparatus comprising: a control device that controls the laser beam irradiation machine to switch the laser beam irradiation machine.
(i) When the ratio of the width of the uncoated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in the first direction satisfies 20% or more and 80% or less; (ii) When the ratio of the width of the coated portion that has entered the laser beam irradiation area to the width of the laser beam irradiation area in one direction satisfies 20% or more and 80% or less; The electrode sheet manufacturing apparatus according to claim 4, wherein the position detector is a laser displacement meter or an image inspection device.