JP6988739B2 - Roll press equipment - Google Patents

Description

The present invention relates to a roll press device, specifically, a roll press device that compresses an electrode sheet in the thickness direction.

Patent Document 1 describes a method of forming an electrode mixture layer on the surface of a long current collector foil while transporting the long current collector foil in the longitudinal direction. This Patent Document 1 describes that a roll having a crown shape (barrel shape) is used as a roll for transporting a current collector foil. It is described that by using the crown-shaped roll, tension applied to the outside in the width direction of the current collector foil is generated from the tension applied in the transport direction, and deformation and meandering of the current collector foil can be suppressed.

Japanese Unexamined Patent Publication No. 2008-117607

By the way, an electrode sheet having a first roll and a second roll that rotate opposite to each other and having a first electrode mixture layer formed on the first surface of the current collector foil is provided in a gap between the first roll and the second roll. A roll press device is known that compresses an electrode sheet (first electrode mixture layer) in the thickness direction of the electrode sheet (first electrode mixture layer).

However, in the above-mentioned roll press apparatus, when the electrode sheet is compressed in the thickness direction by the first roll and the second roll (during roll pressing), the reaction force from the electrode sheet causes the first roll and the second roll to be pressed. It may be elastically deformed inward in the radial direction. Specifically, for example, at the time of roll pressing, the first roll and the second roll may be elastically deformed so as to have a smaller diameter toward the central portion in the axial direction thereof.

For example, at the time of roll pressing, in the first roll, one end of the electrode sheet is in contact with the one end side electrode portion located on one end side in the width direction (the direction corresponding to the axis direction in which the central axis of the first roll extends). The central electrode portion located in the center of the electrode sheet in the width direction as compared with the side roll portion and the other end side roll portion that contacts the other end side electrode portion located on the other end side in the width direction of the electrode sheet. The central roll portion in contact with the electrode may be greatly elastically deformed inward in the radial direction to have a small diameter. The second roll may also be deformed in the same manner.

When the electrode sheet is compressed in the thickness direction by the first roll and the second roll in the state where the first roll and the second roll are deformed in this way, the thickness of the pressed electrode sheet varies in the width direction. There was a time. Specifically, for example, in the electrode sheet after pressing, the thickness of the one-sided electrode portion located on one end side in the width direction and the thickness of the other-end side electrode portion located on the other end side in the width direction. In comparison, the thickness of the central electrode portion located at the center in the width direction may be larger.

The present invention has been made in view of the present situation, and provides a roll press apparatus capable of reducing the thickness variation applied in the width direction of the electrode sheet, which may occur when the electrode sheet is compressed in the thickness direction. The purpose is to do.

In one aspect of the present invention, an electrode sheet comprising a first roll and a second roll that rotate facing each other and having a first electrode mixture layer formed on a first surface of a current collector foil is referred to as the first roll. In a roll press device that compresses the electrode sheet in the thickness direction by passing it through a gap with the second roll, it is a part of the first roll and is on one end side of the electrode sheet in the width direction. A second roll portion that is arranged to face the outer peripheral surface of the one-end side roll portion that is in contact with the located one-end side electrode portion and that heats the one-end side roll portion to expand the one-end side roll portion in the radial direction. The heater is arranged so as to face the outer peripheral surface of the central roll portion, which is a part of the first roll and is in contact with the central electrode portion located at the center in the width direction of the electrode sheet, and is arranged at the center. A second heater that heats the roll portion to expand the central roll portion in the radial direction, and the other end of the electrode sheet, which is a part of the first roll and is located on the other end side in the width direction of the electrode sheet. A third heater, which is arranged to face the outer peripheral surface of the other end side roll portion in contact with the side electrode portion, heats the other end side roll portion, and expands the other end side roll portion in the radial direction. The post-press electrode sheet, which is the electrode sheet after passing through the gap between the first roll and the second roll, is included in the entire thickness of the one end side electrode portion or in the one end side electrode portion. The first thickness detecting device for detecting the first thickness, which is the thickness of the first electrode mixture layer, and the post-pressed electrode sheet are included in the entire thickness of the central electrode portion or in the central electrode portion. With respect to the second thickness detecting device for detecting the second thickness, which is the thickness of the first electrode mixture layer, and the post-pressed electrode sheet, the total thickness of the other end side electrode portion or the other end side. A third thickness detecting device for detecting the third thickness, which is the thickness of the first electrode mixture layer included in the electrode portion, the first thickness detected by the first thickness detecting device, and the second thickness. When there is a difference between the second thickness detected by the detection device and the third thickness detected by the third thickness detection device, the first thickness, the second thickness, and the third thickness are present. The surface of the one-end roll portion is heated by the first heater, the surface of the central roll portion is heated by the second heater, and the third heater is used so that the difference between the thickness and the thickness is reduced. A control device that controls at least one of the heating of the surface of the other end side roll portion. A roll press device comprising.

The roll press device described above is a roll press device including a first roll and a second roll that rotate in opposition to each other. In this roll press device, an electrode sheet having a first electrode mixture layer formed on the first surface of a current collector foil is passed through a gap between the first roll and the second roll to pass an electrode sheet (first electrode combination). The material layer) is compressed in the thickness direction. In this roll press device, the width direction of the electrode sheet is aligned with the axis direction in which the central axis of the first roll extends, and the electrode sheet is passed through the gap between the first roll and the second roll. Is compressed in the thickness direction.

Further, the roll press device described above includes a first heater that heats the surface of the one-end roll portion that is a part of the first roll to expand (diameter) the one-end roll portion in the radial direction. .. Here, the one-end roll portion is in the width direction of the electrode sheet (the direction corresponding to the axial direction in which the central axis of the first roll extends) when the electrode sheet passes through the gap between the first roll and the second roll. ) Is a part that comes into contact with the one-sided electrode portion located on one-sided side. Further, the roll press device described above includes a second heater that heats the surface of the central roll portion that is a part of the first roll to expand (diameter) the central roll portion in the radial direction. Here, the central roll portion is a portion of the electrode sheet that comes into contact with the central electrode portion located at the center in the width direction when the electrode sheet passes through the gap between the first roll and the second roll. Further, the roll press device described above includes a third heater that heats the surface of the other end side roll portion that is a part of the first roll to expand (diameter) the other end side roll portion in the radial direction. .. Here, when the electrode sheet passes through the gap between the first roll and the second roll, the other end side roll portion comes into contact with the other end side electrode portion located on the other end side in the width direction of the electrode sheet. It is a part.

Further, the roll press device described above is a post-press electrode sheet which is an electrode sheet after passing through the gap between the first roll and the second roll, and is located on one end side of the post-press electrode sheet, which is located on one end side in the width direction. A first thickness detecting device for detecting the first thickness, which is the total thickness or the thickness of the first electrode mixture layer included in the electrode portion on one end side of the post-pressed electrode sheet, is provided. Further, it is the total thickness of the central electrode portion located in the center in the width direction of the post-press electrode sheet, or the thickness of the first electrode mixture layer included in the central electrode portion of the post-press electrode sheet. 2 A second thickness detecting device for detecting the thickness is provided. Further, of the post-pressed electrode sheet, the entire thickness of the other end side electrode portion located on the other end side in the width direction, or the first electrode mixture layer included in the other end side electrode portion of the post-pressed electrode sheet. A third thickness detecting device for detecting the third thickness, which is the thickness of the above.

Further, the roll press device described above includes a first thickness detected by the first thickness detecting device, a second thickness detected by the second thickness detecting device, and a third thickness detected by the third thickness detecting device. When there is a difference between, the first heater heats the surface of the roll portion on one end side, and the second heater so that the difference between the first thickness, the second thickness, and the third thickness is reduced. A control device for controlling at least one of heating of the surface of the central roll portion and heating of the surface of the other end side roll portion by the third heater is provided.

As a result, when there is a difference between the first thickness, the second thickness, and the third thickness, the above-mentioned heating control by the control device is performed, so that the first thickness, the second thickness, and the third thickness are formed. The difference between and can be reduced. That is, it is possible to reduce the thickness variation in the width direction of the electrode sheet, which may occur when the electrode sheet is compressed in the thickness direction.

Specifically, by comparing the value of the first thickness, the value of the second thickness, and the value of the third thickness, among the roll portion on one end side, the center roll portion, and the roll portion on the other end side of the first roll. Of the three parts of the post-pressed electrode sheet for which the first thickness, the second thickness, and the third thickness were measured, the roll part in contact with the part having the largest thickness value has the smallest outer diameter. Can be judged. On the contrary, it can be determined that the roll portion in contact with the portion having the smallest thickness value among the three portions of the post-pressed electrode sheet has the largest outer diameter.

Therefore, for example, the surface of the roll portion determined to have the smallest outer diameter among the roll portion on one end side, the center roll portion, and the roll portion on the other end side of the first roll is heated by a heater to obtain the said. By expanding the roll portion in the radial direction (increasing the outer diameter), the outer diameter of the roll portion is brought closer to the outer diameter of the roll portion determined to have the largest outer diameter (for example, equivalently). After that, the difference between the first thickness, the second thickness, and the third thickness can be reduced.

More specifically, for example, the control device calculates a first difference value obtained by subtracting the value of the first thickness from the value of the second thickness, and based on this first difference value, one end side of the first heater is used. It is determined whether to heat the surface of the roll portion or the surface of the central roll portion by the second heater, and the second difference value obtained by subtracting the value of the third thickness from the value of the second thickness is calculated. However, based on this second difference value, it may be determined whether or not the surface of the central roll portion is heated by the second heater or the surface of the other end side roll portion is heated by the third heater. good. For example, the control device heats the surface of the one-end roll portion by the first heater or heats the surface of the central roll portion by the second heater so that the value of the first difference value becomes 0. The surface of the central roll portion is heated by the second heater or the surface of the other end roll portion is heated by the third heater so that the second difference value becomes 0. By doing so, the difference between the first thickness, the second thickness, and the third thickness can be reduced. That is, it is possible to reduce the thickness variation in the width direction of the electrode sheet, which may occur when the electrode sheet is compressed in the thickness direction.

Therefore, according to the roll press device described above, it is possible to reduce the thickness variation in the width direction of the electrode sheet, which may occur when the electrode sheet is compressed in the thickness direction.

Another aspect of the present invention is an electrode sheet in which a first electrode mixture layer is formed on a first surface of a collector foil by using a roll press device including a first roll and a second roll that rotate facing each other. In the roll pressing method of compressing the electrode sheet in the thickness direction by passing the electrode sheet through the gap between the first roll and the second roll, the roll pressing device is a part of the first roll. First, the surface of the one-end side roll portion, which is in contact with the one-end side electrode portion located on one end side in the width direction of the electrode sheet, is heated to expand the one-end side roll portion in the radial direction. The surface of the heater and the central roll portion of the electrode sheet that is in contact with the central electrode portion located at the center in the width direction of the electrode sheet is heated to increase the diameter of the central roll portion. A second heater that expands in the direction and a other end roll portion that is a part of the first roll and is in contact with the other end side electrode portion located on the other end side in the width direction of the electrode sheet. The post-press electrode sheet, which is the electrode sheet after passing through the gap between the first roll and the second roll, and the third heater that heats the surface to expand the other end side roll portion in the radial direction. The first thickness detecting device for detecting the first thickness, which is the total thickness of the one-ended electrode portion or the thickness of the first electrode mixture layer contained in the one-ended electrode portion, and the above. With respect to the post-pressed electrode sheet, a second thickness detecting device for detecting a second thickness, which is the total thickness of the central electrode portion or the thickness of the first electrode mixture layer contained in the central electrode portion, and the above. A third thickness detection for detecting the third thickness of the post-pressed electrode sheet, which is the total thickness of the other end side electrode portion or the thickness of the first electrode mixture layer contained in the other end side electrode portion. The roll press method includes the first thickness detected by the first thickness detecting device, the second thickness detected by the second thickness detecting device, and the third thickness detecting device. When there is a difference between the third thickness detected by the above, the first heater reduces the difference between the first thickness, the second thickness, and the third thickness. At least one of the heating of the surface of the one-end roll portion, the heating of the surface of the central roll portion by the second heater, and the heating of the surface of the other-end roll portion by the third heater. It is a roll press method to perform.

It is a perspective schematic view of the roll press apparatus which concerns on embodiment. It is a side view schematic diagram of the roll press apparatus. It is sectional drawing of the electrode sheet.

(Embodiment)
Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic perspective view of a roll press device 1 according to an embodiment. FIG. 2 is a schematic side view of the roll press device 1. FIG. 3 is a schematic cross-sectional view of the electrode sheet 100 according to the embodiment. In FIGS. 1 to 3, the length direction of the electrode sheet 100 is DL, the thickness direction of the electrode sheet 100 is DT, and the width direction of the electrode sheet 100 is DW.

As shown in FIGS. 1 and 2, the roll press device 1 of the present embodiment is a roll press device 1 including a first roll 20 and a second roll 30 that rotate in opposition to each other. In this roll press device 1, the first electrode mixture layer 120 is formed on the first surface 110b of the current collector foil 110, and the second electrode mixture layer 130 is formed on the second surface 110c of the current collector foil 110. By passing the electrode sheet 100 through the gap between the first roll 20 and the second roll 30, the electrode sheet 100 (specifically, the first electrode mixture layer 120 and the second electrode mixture layer 130) has a thickness thereof. Compress in the direction (see FIGS. 1 to 3). The gap size at the facing portion between the first roll 20 and the second roll 30 is smaller than the thickness of the electrode sheet 100 before pressing.

Further, the electrode sheet 100, which is the press object of the present embodiment, has a current collector foil 110, a first electrode mixture layer 120 laminated on the first surface 110b of the current collector foil 110, and a first of the current collector foil 110. The second electrode mixture layer 130 laminated on the two surfaces 110c is provided. The first electrode mixture layer 120 and the second electrode mixture layer 130 are, for example, an electrode mixture layer in which an electrode active material and a binder are mixed. The electrode sheet 100 is transported in the transport direction along the length direction DL while being supported by a transport roll (not shown) of the roll press device 1.

Further, the roll press device 1 heats the surface of the one-end roll portion 21 which is a part of the first roll 20 to expand (enlarge) the one-end roll portion 21 in the radial direction. 41 is provided (see FIGS. 1 and 2). Here, when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30, the one end side roll portion 21 has a width direction DW (center axis CL1 of the first roll 20) of the electrode sheet 100. It is a portion that comes into contact with the one-end side electrode portion 101 located on one end side (left side in FIGS. 1 and 3) with respect to the direction corresponding to the axial direction in which the is extended. In the present embodiment, the one-end roll portion 21 is the first electrode mixture layer 120 included in the one-end electrode portion 101 of the electrode sheet 100 (this is referred to as the one-end first electrode mixture layer 121). , See FIG. 3).

Further, the roll press device 1 includes a second heater 42 that heats the surface of the central roll portion 22 that is a part of the first roll 20 to expand (diameter) the central roll portion 22 in the radial direction. Here, the central roll portion 22 contacts the central electrode portion 102 located at the center of the electrode sheet 100 in the width direction DW when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30. (See FIGS. 1 to 3). In the present embodiment, the central roll portion 22 is the first electrode mixture layer 120 included in the center electrode portion 102 of the electrode sheet 100 (this is referred to as the central first electrode mixture layer 122, see FIG. 3). Contact the surface.

Further, the roll press device 1 heats the surface of the other end side roll portion 23 which is a part of the first roll 20 to expand (diameter) the other end side roll portion 23 in the radial direction. 43 is provided. Here, when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30, the other end side roll portion 23 has the other end side (FIGS. 1 and FIG. 1) of the electrode sheet 100 with respect to the width direction DW. 3 is a portion that comes into contact with the other end side electrode portion 103 located on the right side). In the present embodiment, the other end side roll portion 23 is the first electrode mixture layer 120 included in the other end side electrode portion 103 of the electrode sheet 100 (this is referred to as the other end side first electrode mixture layer 123). , See FIG. 3).

In the present embodiment, the first roll 20 includes one end side roll portion 21, a central roll portion 22, and the other end side roll portion 23. The one-end roll portion 21, the central roll portion 22, and the other-end roll portion 23 are arranged in this order in the axial direction of the first roll 20, and have the same length in the axial direction of the first roll 20. ..
Further, the electrode sheet 100 includes one end side electrode portion 101, a center electrode portion 102, and the other end side electrode portion 103. The one end side electrode portion 101, the center electrode portion 102, and the other end side electrode portion 103 are arranged in this order in the width direction DW of the electrode sheet 100, and have the same length (width dimension) with respect to the width direction DW. ..

Further, the roll press device 1 is one end side of the electrode sheet 100 (hereinafter, also referred to as the pressed electrode sheet 100) after passing through the gap between the first roll 20 and the second roll 30 in the width direction DW. The thickness (the first thickness T1) of the first electrode mixture layer 120 (the first electrode mixture layer 121 on the one end side) included in the one-end side electrode portion 101 located (on the left side in FIGS. 1 and 3). A first thickness detecting device 61 for detecting (see FIG. 3) is provided.

Further, the roll press device 1 is a first electrode mixture layer 120 (central first electrode mixture layer 122) included in the central electrode portion 102 located at the center of the pressed electrode sheet 100 in the width direction DW. A second thickness detecting device 62 for detecting the thickness (referred to as the second thickness T2, see FIG. 3) is provided.

Further, the roll press device 1 is a first electrode mixture included in the other end side electrode portion 103 located on the other end side (right side in FIGS. 1 and 3) of the electrode sheet 100 after pressing in the width direction DW. A third thickness detecting device 63 for detecting the thickness of the layer 120 (the other end side first electrode mixture layer 123) (referred to as the third thickness T3, see FIG. 3) is provided. The first thickness detecting device 61, the second thickness detecting device 62, and the third thickness detecting device 63 are known thickness gauges, and are composed of, for example, a known laser displacement gauge.

Further, the roll press device 1 heats the surface of the one-end roll portion 31 which is a part of the second roll 30 to expand (enlarge) the one-end roll portion 31 in the radial direction. 51 is provided (see FIGS. 1 and 2). Here, when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30, the one end side roll portion 31 has a width direction DW (center axis CL2 of the second roll 30) of the electrode sheet 100. It is a portion that comes into contact with the one-end side electrode portion 101 located on one end side (left side in FIGS. 1 and 3) with respect to the direction corresponding to the axial direction in which the is extended. In the present embodiment, the one-end side roll portion 31 is the second electrode mixture layer 130 included in the one-end side electrode portion 101 of the electrode sheet 100 (this is referred to as the one-end side second electrode mixture layer 131). , See FIG. 3).

Further, the roll press device 1 includes a fifth heater 52 that heats the surface of the central roll portion 32, which is a part of the second roll 30, to expand (diameter) the central roll portion 32 in the radial direction. Here, the central roll portion 32 contacts the central electrode portion 102 located at the center of the electrode sheet 100 in the width direction DW when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30. (See FIGS. 1 to 3). In the present embodiment, the central roll portion 32 is the second electrode mixture layer 130 included in the center electrode portion 102 of the electrode sheet 100 (this is referred to as the central second electrode mixture layer 132, see FIG. 3). Contact the surface.

Further, the roll press device 1 heats the surface of the other end side roll portion 33 which is a part of the second roll 30 to expand (diameter) the other end side roll portion 33 in the radial direction. 53 is provided. Here, when the electrode sheet 100 passes through the gap between the first roll 20 and the second roll 30, the other end side roll portion 33 has the other end side (FIGS. 1 and FIG. 1) of the electrode sheet 100 with respect to the width direction DW. 3 is a portion that comes into contact with the other end side electrode portion 103 located on the right side). In the present embodiment, the other end side roll portion 33 is the second electrode mixture layer 130 (this is referred to as the other end side second electrode mixture layer 133) included in the other end side electrode portion 103 of the electrode sheet 100. , See FIG. 3).

In the present embodiment, the second roll 30 includes one end side roll portion 31, a central roll portion 32, and the other end side roll portion 33. The one-end roll portion 31, the central roll portion 32, and the other end-side roll portion 33 are arranged in this order in the axial direction of the second roll 30, and have the same length in the axial direction of the second roll 30. ..

Further, the roll press device 1 has one end side (FIG. 1 and FIG. 1 and) of the electrode sheet 100 (the electrode sheet 100 after pressing) after passing through the gap between the first roll 20 and the second roll 30 in the width direction DW. The thickness of the second electrode mixture layer 130 (the second electrode mixture layer 131 on the one end side) included in the one-end side electrode portion 101 located on the left side in FIG. 3 (referred to as the fourth thickness T4, see FIG. 3). A fourth thickness detecting device 71 for detecting the above is provided.

Further, the roll press device 1 is a second electrode mixture layer 130 (central second electrode mixture layer 132) included in the central electrode portion 102 located at the center of the pressed electrode sheet 100 in the width direction DW. A fifth thickness detecting device 72 for detecting the thickness (referred to as the fifth thickness T5, see FIG. 3) is provided.

Further, the roll press device 1 is a second electrode mixture included in the other end side electrode portion 103 located on the other end side (right side in FIGS. 1 and 3) of the pressed electrode sheet 100 in the width direction DW. A sixth thickness detecting device 73 for detecting the thickness (referred to as the sixth thickness T6, see FIG. 3) of the layer 130 (the second electrode mixture layer 133 on the other end side) is provided. The fourth thickness detecting device 71, the fifth thickness detecting device 72, and the sixth thickness detecting device 73 are known thickness gauges, and are composed of, for example, a known laser displacement gauge.

Further, the roll press device 1 detects the temperature of the surface of the one end side roll portion 21 of the first roll 20 of the first thermometer 81 and the temperature of the surface of the central roll portion 22 of the first roll 20. A second thermometer 82 and a third thermometer 83 for detecting the temperature of the surface of the other end side roll portion 23 of the first roll 20 are provided (see FIGS. 1 and 2).

Further, the roll press device 1 detects the temperature of the surface of the one end side roll portion 31 of the second roll 30 with the fourth thermometer 91 and the temperature of the surface of the central roll portion 32 of the second roll 30. A fifth thermometer 92 and a sixth thermometer 93 for detecting the temperature of the surface of the other end side roll portion 33 of the second roll 30 are provided (see FIGS. 1 and 2).

Further, the roll press device 1 includes a control device 10. The control device 10 includes the above-mentioned first thickness detection device 61, second thickness detection device 62, third thickness detection device 63, fourth thickness detection device 71, fifth thickness detection device 72, and sixth thickness detection device 73. , 1st heater 41, 2nd heater 42, 3rd heater 43, 4th heater 51, 5th heater 52, 6th heater 53, 1st thermometer 81, 2nd thermometer 82, 3rd thermometer 83, 1st The 4th thermometer 91, the 5th thermometer 92, and the 6th thermometer 93 are electrically connected by a cable.

The control device 10 includes a first thickness T1 (μm) detected by the first thickness detecting device 61, a second thickness T2 (μm) detected by the second thickness detecting device 62, and a third thickness detecting device 63. When there is a difference between the third thickness T3 (μm) detected by the first thickness T1 and the third thickness T3, the difference between the first thickness T1 and the second thickness T2 and the third thickness T3 is reduced. At least one of heating the surface of the one-end roll portion 21 by the heater 41, heating the surface of the central roll portion 22 by the second heater 42, and heating the surface of the other-end roll portion 23 by the third heater 43. It is controlled so that the heating is performed.

As a result, when there is a difference between the first thickness T1, the second thickness T2, and the third thickness T3, the above-mentioned heating control by the control device 10 is performed, so that the first thickness T1 and the second thickness T1 and the second thickness T1 and the second. The difference between the thickness T2 and the third thickness T3 can be reduced. Therefore, it is possible to reduce the thickness variation applied to the width direction DW of the electrode sheet 100, which may occur when the electrode sheet 100 is compressed in the thickness direction DT.

Specifically, by comparing the value of the first thickness T1, the value of the second thickness T2, and the value of the third thickness T3, one end side roll portion 21 and the central roll portion 22 of the first roll 20 and the other Of the end-side roll portions 23, three parts of the electrode sheet 100 after pressing for measuring the first thickness T1, the second thickness T2, and the third thickness T3 (one end side first electrode mixture layer 121 and the central first). It can be determined that the roll portion in contact with the portion having the largest thickness value in the one-electrode mixture layer 122 and the other end side first electrode mixture layer 123) has the smallest outer diameter. On the contrary, it is the thickest of the three parts of the electrode sheet 100 after pressing (one end side first electrode mixture layer 121, central first electrode mixture layer 122, and other end side first electrode mixture layer 123). It can be determined that the roll portion in contact with the portion where the value of is smaller has the largest outer diameter.

Therefore, for example, the surface of the roll portion determined to have the smallest outer diameter among the one-end roll portion 21, the central roll portion 22, and the other-end roll portion 23 of the first roll 20 is heated by a heater. Then, by expanding the roll portion in the radial direction (increasing the outer diameter), the outer diameter of the roll portion is brought closer to the outer diameter of the roll portion determined to have the largest outer diameter (the outer diameter is increased). For example, by making them equivalent), the difference between the first thickness T1 and the second thickness T2 and the third thickness T3 can be reduced thereafter.

In the present embodiment, the control device 10 calculates a first difference value Δ1 (= T2-T1) obtained by subtracting the value of the first thickness T1 from the value of the second thickness T2, and the first difference value Δ1 (μm). Based on the above, it is determined whether or not at least one of the heating of the surface of the one-sided roll portion 21 by the first heater 41 and the heating of the surface of the central roll portion 22 by the second heater 42 is performed. , The second difference value Δ2 obtained by subtracting the value of the third thickness T3 from the value of the second thickness T2 is calculated, and based on this second difference value Δ2 (μm), the surface of the central roll portion 22 by the second heater 42. It is determined whether or not at least one of the heating of the above and the heating of the surface of the other end side roll portion 23 by the third heater 43 is performed.

More specifically, in the present embodiment, the control device 10 heats the surface of the one-end roll portion 21 by the first heater 41 so that the value of the first difference value Δ1 becomes 0, and the second. At least one of the heating of the surface of the central roll portion 22 by the heater 42 is performed, and the surface of the central roll portion 22 is heated by the second heater 42 and the second heater 42 so that the second difference value Δ2 becomes 0. It is controlled so that at least one of the heating of the surface of the other end side roll portion 23 by the 3 heater 43 is performed.

Specifically, in the present embodiment, the table is set as [roll surface temperature difference X1 obtained by subtracting the surface temperature of one end side roll portion 21 from the surface temperature of the central roll portion 22] = 0.6 × [first difference value Δ1]. Based on the value of the roll surface temperature difference X1 calculated by the relational expression 1, the control device 10 heats the surface of the one-end side roll portion 21 by the first heater 41 and the central roll by the second heater 42. It is controlled so that at least one of the heating of the surface of the portion 22 is performed. The relational expression 1 is derived based on a test conducted in advance, and the difference between the surface temperature of the central roll portion 22 and the surface temperature of the one-end roll portion 21 is determined by the relational expression 1. The value of the first difference value Δ1 is set to 0 by heating at least one of the surface of the central roll portion 22 and the surface of the one-end roll portion 21 so that the roll surface temperature difference X1 is obtained. Is possible.

For example, when the first difference value Δ1 = 4 μm, it is calculated as X1 = 0.6 × 4 = 2.4 (° C.) by the above relational expression 1, and the temperature of the surface of the central roll portion 22 is on the other hand. The temperature should be 2.4 ° C higher than the surface temperature of the end roll portion 21. Specifically, in the control device 10, the temperature of the surface of the central roll portion 22 detected by the second thermometer 82 is higher than the temperature of the surface of the one-end roll portion 21 detected by the first thermometer 81. The surface of the central roll portion 22 is heated by at least the second heater 42 until the temperature rises by 2.4 ° C. This makes it possible to make the first thickness T1 and the second thickness T2 equal.

Further, in the present embodiment, it is expressed as [roll surface temperature difference X2 obtained by subtracting the surface temperature of the other end side roll portion 23 from the surface temperature of the central roll portion 22] = 0.6 × [second difference value Δ2]. Based on the value of the roll surface temperature difference X2 calculated by the relational expression 2, the control device 10 heats the surface of the central roll portion 22 by the second heater 42 and the other end side roll portion 23 by the third heater 43. It is controlled so that at least one of the heating of the surface of the surface is performed. The above relational expression 2 is also derived based on a test conducted in advance, and the difference between the surface temperature of the central roll portion 22 and the surface temperature of the other end side roll portion 23 is obtained by the above relational expression 2. The value of the second difference value Δ2 is set to 0 by heating at least one of the surface of the central roll portion 22 and the surface of the other end side roll portion 23 so that the roll surface temperature difference X2 is obtained. Is possible.

For example, when the second difference value Δ2 = 2 μm, it is calculated as X2 = 0.6 × 2 = 1.2 (° C.) by the above relational expression 2, and the temperature of the surface of the central roll portion 22 is the other. The temperature should be 1.2 ° C higher than the surface temperature of the end roll portion 23. Specifically, in the control device 10, the temperature of the surface of the central roll portion 22 detected by the second thermometer 82 is higher than the temperature of the surface of the other end side roll portion 23 detected by the third thermometer 83. The surface of the central roll portion 22 is heated by at least the second heater 42 until the temperature rises by 1.2 ° C. This makes it possible to make the third thickness T3 and the second thickness T2 equal.

That is, when the first difference value Δ1 = 4 μm and the second difference value Δ2 = 2 μm, the control device determines that the temperature of the surface of the central roll portion 22 is the temperature of the surface of the one end side roll portion 21. One end by the first heater 41 so that the temperature is 2.4 ° C higher than the temperature and the temperature of the surface of the central roll portion 22 is 1.2 ° C higher than the temperature of the surface of the other end roll portion 23. Of the heating of the surface of the side roll portion 21, the heating of the surface of the central roll portion 22 by the second heater 42, and the heating of the surface of the other end side roll portion 23 by the third heater 43, at least the center by the second heater 42. The surface of the roll portion 22 is heated.

For example, when the first difference value Δ1 = 4 μm and the second difference value Δ2 = 2 μm, the temperature of the surface of the one-end roll portion 21, the temperature of the surface of the central roll portion 22, and the temperature of the surface of the central roll portion 22 at this time, and When the temperature of the surface of the other end side roll portion 23 is the same, the control device uses the second heater 42 so that the temperature of the surface of the central roll portion 22 is 2.4 ° C. higher than the current temperature. A third so that the surface of the central roll portion 22 is heated and the temperature of the surface of the other end side roll portion 23 is 1.2 (= 2.4-1.2) ° C higher than the current temperature. The surface of the other end side roll portion 23 is heated by the heater 43. As a result, the temperature of the surface of the central roll portion 22 is 2.4 ° C higher than the temperature of the surface of the one-end roll portion 21, and the temperature of the surface of the central roll portion 22 is higher than the temperature of the surface of the other end-side roll portion 23. It is 1.2 ° C higher than the surface temperature of.

By doing so, the first thickness T1 (thickness of the first electrode mixture layer 121 on one end side after pressing) and the second thickness T2 (thickness of the central first electrode mixture layer 122 after pressing) The difference from the third thickness T3 (thickness of the first electrode mixture layer 123 on the other end side after pressing) can be reduced. Therefore, by using the roll press device 1 of the present embodiment, the thickness applied to the width DW of the electrode sheet 100 (first electrode mixture layer 120) that can be generated when the electrode sheet 100 is compressed in the thickness direction DT. The variation (thickness variation between the one-end side first electrode mixture layer 121, the central first electrode mixture layer 122, and the other end side first electrode mixture layer 123) can be reduced.

Further, the control device 10 includes a fourth thickness T4 (μm) detected by the fourth thickness detecting device 71, a fifth thickness T5 (μm) detected by the fifth thickness detecting device 72, and a sixth thickness detecting device. When there is a difference between the sixth thickness T6 (μm) detected by 73, the difference between the fourth thickness T4, the fifth thickness T5, and the sixth thickness T6 is reduced. At least one of the heating of the surface of the one-end roll portion 31 by the four heater 51, the heating of the surface of the central roll portion 32 by the fifth heater 52, and the heating of the surface of the other-end roll portion 33 by the sixth heater 53. Control so that either heating is performed.

As a result, when there is a difference between the fourth thickness T4, the fifth thickness T5, and the sixth thickness T6, the above-mentioned heating control by the control device 10 is performed, so that the fourth thickness T4 and the fifth thickness T4 and the fifth thickness T6. The difference between the thickness T5 and the sixth thickness T6 can be reduced. Therefore, it is possible to reduce the thickness variation applied to the width direction DW of the electrode sheet 100, which may occur when the electrode sheet 100 is compressed in the thickness direction DT.

Specifically, by comparing the value of the fourth thickness T4, the value of the fifth thickness T5, and the value of the sixth thickness T6, one end side roll portion 31, the central roll portion 32, and the other side of the second roll 30 are compared. Of the end-side roll portions 33, three parts of the electrode sheet 100 after pressing for measuring the fourth thickness T4, the fifth thickness T5, and the sixth thickness T6 (one end side second electrode mixture layer 131 and the central first). It can be determined that the roll portion in contact with the portion of the two-electrode mixture layer 132 and the other end side second electrode mixture layer 133) having the largest thickness value has the smallest outer diameter. On the contrary, it is the thickest of the three parts of the electrode sheet 100 after pressing (one end side second electrode mixture layer 131, central second electrode mixture layer 132, and other end side second electrode mixture layer 133). It can be determined that the roll portion in contact with the portion where the value of is smaller has the largest outer diameter.

Therefore, for example, the surface of the roll portion determined to have the smallest outer diameter among the one end side roll portion 31, the central roll portion 32, and the other end side roll portion 33 of the second roll 30 is heated by a heater. Then, by expanding the roll portion in the radial direction (increasing the outer diameter), the outer diameter of the roll portion is brought closer to the outer diameter of the roll portion determined to have the largest outer diameter (the outer diameter is increased). For example, by making them equivalent), the difference between the fourth thickness T4, the fifth thickness T5, and the sixth thickness T6 can be reduced thereafter.

In the present embodiment, the control device 10 calculates a third difference value Δ3 (= T5-T4) obtained by subtracting the value of the fourth thickness T4 from the value of the fifth thickness T5, and the third difference value Δ3 (μm). Based on the above, it is determined whether or not the surface of the one-sided roll portion 31 is heated by the fourth heater 51 or the surface of the central roll portion 32 is heated by the fifth heater 52, and the fifth thickness T5 is determined. The fourth difference value Δ4 obtained by subtracting the value of the sixth thickness T6 from the value is calculated, and based on this fourth difference value Δ4 (μm), the surface of the central roll portion 32 is heated by the fifth heater 52, or the fourth difference value is obtained. 6 It is determined whether or not to heat the surface of the other end side roll portion 33 by the heater 53.

More specifically, in the present embodiment, the control device 10 heats the surface of the one-end roll portion 31 by the fourth heater 51 so that the value of the third difference value Δ3 becomes 0, and the fifth. At least one of the heating of the surface of the central roll portion 32 by the heater 52 is performed, and the surface of the central roll portion 32 is heated by the fifth heater 52 so that the fourth difference value Δ4 becomes 0, and the first It is controlled so that at least one of the heating of the surface of the other end side roll portion 33 by the 6 heater 53 is performed.

Specifically, in the present embodiment, the table is set as [roll surface temperature difference X3 obtained by subtracting the surface temperature of one end side roll portion 31 from the surface temperature of the central roll portion 32] = 0.6 × [third difference value Δ3]. Based on the value of the roll surface temperature difference X3 calculated by the relational expression 3, the control device 10 heats the surface of the one-end side roll portion 31 by the fourth heater 51 and the central roll by the fifth heater 52. It is controlled so that at least one of the heating of the surface of the portion 32 is performed. The relational expression 3 is also derived based on a test conducted in advance, and the difference between the surface temperature of the central roll portion 32 and the surface temperature of the one-end roll portion 31 is determined by the relational expression 3. The value of the third difference value Δ3 is set to 0 by heating at least one of the surface of the central roll portion 32 and the surface of the one-end side roll portion 31 so that the roll surface temperature difference X3 is obtained. Is possible.

For example, when the third difference value Δ3 = 3 μm, it is calculated as X3 = 0.6 × 3 = 1.8 (° C.) by the above relational expression 3, and the temperature of the surface of the central roll portion 32 is on the other hand. The temperature should be 1.8 ° C. higher than the surface temperature of the end roll portion 31. Specifically, in the control device 10, the temperature of the surface of the central roll portion 32 detected by the fifth thermometer 92 is higher than the temperature of the surface of the one-end roll portion 31 detected by the fourth thermometer 91. The surface of the central roll portion 32 is heated by at least the fifth heater 52 until the temperature rises by 1.8 ° C. This makes it possible to make the fourth thickness T4 and the fifth thickness T5 equal.

Further, in the present embodiment, it is expressed as [roll surface temperature difference X4 obtained by subtracting the surface temperature of the other end side roll portion 33 from the surface temperature of the central roll portion 32] = 0.6 × [fourth difference value Δ4]. Based on the value of the roll surface temperature difference X4 calculated by the relational expression 4, the control device 10 heats the surface of the central roll portion 32 by the fifth heater 52 and the other end side roll portion 33 by the sixth heater 53. It is controlled so that at least one of the heating of the surface of the surface is performed. The relational expression 4 is also derived based on a test conducted in advance, and the difference between the surface temperature of the central roll portion 32 and the surface temperature of the other end side roll portion 33 is obtained by the relational expression 4. By heating at least one of the surface of the central roll portion 32 and the surface of the other end side roll portion 33 so that the roll surface temperature difference X4 is obtained, the value of the fourth difference value Δ4 is set to 0. Is possible.

For example, when the fourth difference value Δ4 = 1 μm, it is calculated as X4 = 0.6 × 1 = 0.6 (° C.) by the above relational expression 4, and the temperature of the surface of the central roll portion 32 is the other. The temperature should be 0.6 ° C. higher than the surface temperature of the end roll portion 33. Specifically, in the control device 10, the temperature of the surface of the central roll portion 32 detected by the fifth thermometer 92 is higher than the temperature of the surface of the other end side roll portion 33 detected by the sixth thermometer 93. The surface of the central roll portion 32 is heated by at least the fifth heater 52 until the temperature rises by 0.6 ° C. This makes it possible to make the fifth thickness T5 and the sixth thickness T6 equal.

That is, when the third difference value Δ3 = 3 μm and the fourth difference value Δ4 = 1 μm, the temperature of the surface of the central roll portion 32 is the temperature of the surface of the one-end roll portion 31 in the control device 10. One end by the fourth heater 51 so that the temperature is 1.8 ° C. higher than the temperature and the temperature of the surface of the central roll portion 32 is 0.6 ° C. higher than the temperature of the surface of the other end side roll portion 33. Of the heating of the surface of the side roll portion 31, the heating of the surface of the central roll portion 32 by the fifth heater 52, and the heating of the surface of the other end side roll portion 33 by the sixth heater 53, at least the center by the fifth heater 52. The surface of the roll portion 32 is heated.

For example, when the third difference value Δ3 = 3 μm and the fourth difference value Δ4 = 1 μm, the temperature of the surface of the one-end roll portion 31, the temperature of the surface of the central roll portion 32, and the temperature of the surface of the central roll portion 32 at this time, and When the temperature of the surface of the other end side roll portion 33 is the same, the temperature of the surface of the central roll portion 32 is 1.8 ° C. higher than the current temperature, so that the central roll portion 32 by the fifth heater 52 is used. The other is heated by the sixth heater 53 so that the temperature of the surface of the other end side roll portion 23 is 1.2 (= 1.8-0.6) ° C higher than the current temperature. The surface of the end side roll portion 33 is heated. As a result, the temperature of the surface of the central roll portion 32 is 1.8 ° C. higher than the temperature of the surface of the one end side roll portion 31, and the temperature of the surface of the central roll portion 32 is the temperature of the other end side roll portion 33. It is 0.6 ° C higher than the surface temperature.

By doing so, the fourth thickness T4 (thickness of the second electrode mixture layer 131 on one end side after pressing) and the fifth thickness T5 (thickness of the central second electrode mixture layer 132 after pressing) The difference from the sixth thickness T6 (thickness of the second electrode mixture layer 133 on the other end side after pressing) can be reduced. Therefore, by using the roll press device 1 of the present embodiment, the thickness applied to the width DW of the electrode sheet 100 (second electrode mixture layer 130) that can be generated when the electrode sheet 100 is compressed in the thickness direction DT. The variation (thickness variation between the one-end side second electrode mixture layer 131, the central second electrode mixture layer 132, and the other end side second electrode mixture layer 133) can be reduced.

As described above, according to the roll press apparatus 1 of the present embodiment, it is possible to reduce the thickness variation applied to the width direction DW of the electrode sheet 100, which may occur when the electrode sheet 100 is compressed in the thickness direction DT. can.

The roll press device 1 includes the temperature of the surface of the one-end roll portion 21, the central roll portion 22, and the other-end roll portion 23 of the first roll 20, and the one-end side roll portion 31 of the second roll 30. A chiller (not shown) for keeping the temperature of the surfaces of the central roll portion 32 and the other end side roll portion 33 within a predetermined temperature range may be provided. The temperature of the surface of the one-end roll portion 21, the central roll portion 22, and the other-end roll portion 23 of the first roll 20, and the one-end side roll portion 31, the central roll portion 32, and the other end side of the second roll 30. By keeping the temperature of the surface of the roll portion 33 within a predetermined temperature range, the outer diameters of the first roll 20 and the second roll 30 can be kept within a predetermined range, and the first electrode after pressing can be kept within a predetermined range. It is possible to keep the thickness of the material layer 120 and the second electrode mixture layer 130 within a predetermined range.

Next, the roll press method of the electrode sheet 100 according to the embodiment will be described. First, the electrode sheet 100 is passed through the gap between the first roll 20 and the second roll 30, and the electrode sheet 100 is conveyed in the transport direction (direction from left to right in FIG. 2) along the length direction DL. Then, the roll press of the electrode sheet 100 by the roll press device 1 is started. Then, the control device 10 has a value of the first thickness T1 (μm) detected by the first thickness detecting device 61 and a second thickness T2 (μm) detected by the second thickness detecting device 62 at regular intervals. And the value of the third thickness T3 (μm) detected by the third thickness detecting device 63 are acquired, and the first difference value Δ1 (1) obtained by subtracting the value of the first thickness T1 from the value of the second thickness T2 ( = T2-T1) is calculated, and the second difference value Δ2 is calculated by subtracting the value of the third thickness T3 from the value of the second thickness T2.

Further, the control device 10 has a value of the fourth thickness T4 (μm) detected by the fourth thickness detecting device 71 and a fifth thickness T5 (μm) detected by the fifth thickness detecting device 72 at regular intervals. And the value of the sixth thickness T6 (μm) detected by the sixth thickness detecting device 73 are acquired, and the value of the fourth thickness T4 is subtracted from the value of the fifth thickness T5, and the third difference value Δ3 ( = T5-T4) is calculated, and the fourth difference value Δ4 is calculated by subtracting the value of the sixth thickness T6 from the value of the fifth thickness T5.

When the first difference value Δ1 (= T2-T1) is not 0, the control device 10 determines the roll surface temperature difference X1 obtained by subtracting the surface temperature of the one-end roll portion 21 from the surface temperature of the central roll portion 22. ] = 0.6 × The value of the first difference value Δ1 is substituted into the relational expression 1 expressed as [first difference value Δ1] to obtain the roll surface temperature difference X1. Then, at least one of the surface of the central roll portion 22 and the surface of the one-end roll portion 21 is heated so that the roll surface temperature difference X1 obtained by the above relational expression 1 is obtained. Specifically, the value obtained by subtracting the temperature of the surface of the one-ended roll portion 21 detected by the first thermometer 81 from the temperature of the surface of the central roll portion 22 detected by the second thermometer 82 is the above. Of the heating of the surface of the central roll portion 22 by the second heater 42 and the heating of the surface of the one-sided roll portion 21 by the first heater 41 until the roll surface temperature difference X1 obtained by the relational expression 1 is reached. Have them do at least one.

Further, when the second difference value Δ2 (= T2-T3) is not 0, the control device 10 determines the roll surface temperature difference X2 obtained by subtracting the surface temperature of the other end roll portion 23 from the surface temperature of the central roll portion 22. ] = 0.6 × The value of the second difference value Δ2 is substituted into the relational expression 2 expressed as [second difference value Δ2] to obtain the roll surface temperature difference X2. Then, at least one of the surface of the central roll portion 22 and the surface of the other end side roll portion 23 is heated so that the roll surface temperature difference X2 obtained by the above relational expression 2 is obtained. Specifically, the value obtained by subtracting the temperature of the surface of the other end side roll portion 23 detected by the third thermometer 83 from the temperature of the surface of the central roll portion 22 detected by the second thermometer 82 is the above. Of the heating of the surface of the central roll portion 22 by the second heater 42 and the heating of the surface of the other end side roll portion 23 by the third heater 43 until the roll surface temperature difference X2 obtained by the relational expression 2 is reached. Have them do at least one.

Further, when the third difference value Δ3 (= T5-T4) is not 0, the control device 10 determines the roll surface temperature difference X3 obtained by subtracting the surface temperature of the one-end roll portion 31 from the surface temperature of the central roll portion 32. ] = 0.6 × The value of the third difference value Δ3 is substituted into the relational expression 3 expressed as [third difference value Δ3] to obtain the roll surface temperature difference X3. Then, at least one of the surface of the central roll portion 32 and the surface of the one-end side roll portion 31 is heated so that the roll surface temperature difference X3 obtained by the above relational expression 3 is obtained. Specifically, the value obtained by subtracting the temperature of the surface of the one-ended roll portion 31 detected by the fourth thermometer 91 from the temperature of the surface of the central roll portion 32 detected by the fifth thermometer 92 is the above. Of the heating of the surface of the central roll portion 32 by the fifth heater 52 and the heating of the surface of the one-sided roll portion 31 by the fourth heater 51 until the roll surface temperature difference X3 obtained by the relational expression 3 is reached. Have them do at least one.

Further, when the fourth difference value Δ4 (= T5-T6) is not 0, the control device 10 determines the roll surface temperature difference X4 obtained by subtracting the surface temperature of the other end roll portion 33 from the surface temperature of the central roll portion 32. ] = 0.6 × The value of the fourth difference value Δ4 is substituted into the relational expression 4 expressed as [fourth difference value Δ4] to obtain the roll surface temperature difference X4. Then, at least one of the surface of the central roll portion 32 and the surface of the other end side roll portion 33 is heated so that the roll surface temperature difference X4 obtained by the above relational expression 4 is obtained. Specifically, the value obtained by subtracting the temperature of the surface of the other end side roll portion 33 detected by the sixth thermometer 93 from the temperature of the surface of the central roll portion 32 detected by the fifth thermometer 92 is the above. Of the heating of the surface of the central roll portion 32 by the fifth heater 52 and the heating of the surface of the other end side roll portion 33 by the sixth heater 53 until the roll surface temperature difference X4 obtained by the relational expression 4 is reached. Have them do at least one.

By repeating the above process during the roll pressing of the electrode sheet 100 by the roll press device 1, the width direction DW of the electrode sheet 100, which may occur when the electrode sheet 100 is compressed in the thickness direction DT. It is possible to reduce the thickness variation applied to.

Although the present invention has been described above in accordance with the embodiment, it is needless to say that the present invention is not limited to the above-described embodiment and can be appropriately modified and applied without departing from the gist thereof.

For example, in the embodiment, as the electrode sheet to be pressed, the current collector foil 110, the first electrode mixture layer 120 laminated on the first surface 110b of the current collector foil 110, and the second collector foil 110. An electrode sheet 100 composed of a second electrode mixture layer 130 laminated on the surface 110c was exemplified. However, according to the present invention, the electrode sheet is composed of the current collector foil 110 and the first electrode mixture layer 120 laminated on the first surface 110b of the current collector foil 110 without having the second electrode mixture layer 130. It can also be applied to roll presses.

In this case, from the roll press device 1, the fourth heater 51, the fifth heater 52, the sixth heater 53, the fourth thermometer 91, the fifth thermometer 92, the sixth thermometer 93, and the fourth. The electrode sheet may be roll-pressed (compressed in the thickness direction) by using a roll press device from which the thickness detection device 71, the fifth thickness detection device 72, and the sixth thickness detection device 73 have been removed. ..

Further, in this case, as the first thickness, the first thickness detecting device 61 detects the entire thickness of the one-sided electrode portion 101, and as the second thickness, the second thickness detecting device 62 detects the entire thickness of the central electrode portion 102. The thickness may be detected, and as the third thickness, the third thickness detecting device 63 may detect the entire thickness of the other end side electrode portion 103.

1 Roll press device 10 Control device 20 First roll 21 One end side roll part 22 Central roll part 23 The other end side roll part 30 Second roll 31 One end side roll part 32 Central roll part 33 The other end side roll part 41 First Heater 42 2nd heater 43 3rd heater 51 4th heater 52 5th heater 53 6th heater 61 1st thickness detection device 62 2nd thickness detection device 63 3rd thickness detection device 71 4th thickness detection device 72 5th thickness detection Device 73 6th thickness detection device 81 1st thermometer 82 2nd thermometer 83 3rd thermometer 91 4th thermometer 92 5th thermometer 93 6th thermometer 100 Electrode sheet 101 One end side electrode part 102 Central electrode part 103 Opposite end side electrode portion 110 Current collecting foil 110b First surface 110c Second surface 120 First electrode mixture layer 130 Second electrode mixture layer DL Length direction DT Thickness direction DW Width direction T1 First thickness T2 Second thickness T3 3rd thickness T4 4th thickness T5 5th thickness T6 6th thickness

Claims (1)

An electrode sheet having a first roll and a second roll that rotate facing each other and having a first electrode mixture layer formed on a first surface of a current collector foil is provided in a gap between the first roll and the second roll. In a roll press device that compresses the electrode sheet in the thickness direction by passing through the electrode sheet.
A part of the first roll, which is arranged to face the outer peripheral surface of the one-end side roll portion which is in contact with the one-end side electrode portion located on one end side in the width direction of the electrode sheet. A first heater that heats the one-end roll portion to expand the one-end roll portion in the radial direction.
A part of the first roll, which is arranged facing the outer peripheral surface of the central roll portion of the electrode sheet that contacts the central electrode portion located at the center in the width direction, heats the central roll portion. Then, the second heater that expands the central roll portion in the radial direction and
A part of the first roll, which is arranged to face the outer peripheral surface of the other end side roll portion of the electrode sheet, which is in contact with the other end side electrode portion located on the other end side in the width direction. A third heater that heats the other end side roll portion and expands the other end side roll portion in the radial direction.
The post-press electrode sheet, which is the electrode sheet after passing through the gap between the first roll and the second roll, is included in the entire thickness of the one end side electrode portion or in the one end side electrode portion. A first thickness detecting device for detecting the first thickness, which is the thickness of the first electrode mixture layer,
With respect to the post-pressed electrode sheet, a second thickness detecting device for detecting the entire thickness of the central electrode portion or the thickness of the first electrode mixture layer contained in the central electrode portion, which is a second thickness.
With respect to the post-pressed electrode sheet, a third thickness for detecting the entire thickness of the other end side electrode portion or the thickness of the first electrode mixture layer contained in the other end side electrode portion is detected. With the detector
Between the first thickness detected by the first thickness detecting device, the second thickness detected by the second thickness detecting device, and the third thickness detected by the third thickness detecting device. When there is a difference, the surface of the one-end roll portion is heated by the first heater so that the difference between the first thickness, the second thickness, and the third thickness is reduced. A control device for controlling at least one of heating of the surface of the central roll portion by the second heater and heating of the surface of the other end side roll portion by the third heater is provided. Roll press equipment.

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