JP2017059473A - Manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing apparatus which can suppress variations in thickness of a belt-like member after pressing.SOLUTION: A manufacturing apparatus 40 comprises a first press device 44 which performs a first pressing of an electrode material 17; first to third sensors 55a-55c which acquire the thickness of a coating part 18 immediately after the pressing by the first press device 44; and a second press device 50 which presses the electrode material 17 after the pressing by the first press device 44, and can change the pressing amount by a hydraulic cylinder 53. Also, the manufacturing apparatus 40 comprises a second control device 54 which controls the hydraulic cylinder 53 of the second press device 50. The first to third sensors 55a-55c acquire the thickness of a specific area in the coating part 18 for three times, and the second control device 54 controls the hydraulic cylinder 53 on the basis of the thickness in the specific area acquired for three times.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a manufacturing apparatus for pressing a strip-shaped member.

  As a secondary battery which is a kind of power storage device, a lithium ion secondary battery, a nickel hydride secondary battery, and the like are known. For example, a lithium ion secondary battery includes a case, and an electrode assembly in which a positive electrode and a negative electrode including an active material layer are stacked or wound in a metal foil. In manufacturing the electrodes of each electrode, first, an active material mixture in which an active material, a conductive agent, a solvent and a binder are mixed is applied to the surface of a long strip-shaped metal foil (current collector) and dried to remove the solvent. By removing, an electrode material is formed as a belt-shaped member having a metal foil and a coating portion of the active material mixture.

  Next, in order to increase the density of the active material layer, the coated part is pressed. This press is performed by pressing the coated portion with a press roll from the direction intersecting the surface (see, for example, Patent Document 1).

JP 2003-53759 A

  By the way, pressing and thinning a long belt-like member with a press roll is not limited to electrodes such as a resin sheet, but it is known that a springback occurs after pressing depending on the material. When a springback occurs after pressing, the thickness of the pressed member increases with time after the pressing, and as a result, the target thickness may not be achieved. This is because the amount of increase due to springback (hereinafter referred to as “springback amount”) is not always constant. For example, in the case of an electrode material, it varies depending on the thickness of the coated portion, the density of the active material, the pressing conditions, and the like. Therefore, it is difficult to assume the amount of springback before pressing, and the thickness of the member after pressing varies. For example, in the case of an electrode, a predetermined number of electrodes are stacked to form an electrode assembly and accommodated in a case of a corresponding size. However, if the thickness variation is large, the electrode assembly cannot be accommodated in the case. Variations in the amount of trouble cause malfunctions.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a manufacturing apparatus that can suppress variations in the thickness of a strip-shaped member after pressing.

  The manufacturing apparatus for solving the above-described problems has a coating member of an active material mixture on at least one side of a long current collector, and the belt-shaped member conveyed in the longitudinal direction is the coating unit. After the pressing by the first press device, the first press device that presses from the direction intersecting the surface, the thickness acquisition device that acquires the thickness of the coating part immediately after the press by the first press device, and the first press device, The belt-shaped member is pressed from a direction intersecting the surface of the coating portion, and includes a second press device capable of changing a press amount by a driving device, and a control device for controlling the driving device, and the thickness The acquisition device acquires the thickness of the specific location in the coating part at least three times, and the control device controls the driving device based on the thickness of the specific location acquired at least three times. .

  According to this, after the first press by the first press device, the control device predicts the spring back amount generated after the first press based on the thickness acquired by the thickness acquisition device. Is estimated. And when pressing a coating part with a 2nd press apparatus, a control apparatus makes a springback so that the thickness of the coating part obtained after the 2nd press may become a preset target thickness. A press amount is taken into consideration, and the drive device is controlled so that the press amount is obtained. Then, the thickness of the coating part after the second press becomes a thickness in which the thickness fluctuation due to the spring back is suppressed. Therefore, by feeding forward (reflecting) the thickness of the coated part after the first press to the second press, the thickness variation due to the springback can be suppressed, and the thickness of the coated part Can approach the target thickness.

  In addition, for the manufacturing apparatus, the control device calculates the thickness of the coating portion in consideration of the amount of springback at the specific location immediately after pressing by the first press device using an arithmetic expression, The driving device may be controlled based on the thickness.

  According to this, for example, using a table that correlates the thickness acquired by the thickness acquisition device and the thickness reflecting the springback, the estimation is made in comparison with the case of estimating the thickness of the coating part. The thickness can be brought close to the actually measured value, and the thickness after the second press can be brought close to the target thickness.

For the manufacturing apparatus, when the thickness of the coating part immediately after pressing by the first pressing apparatus is dp, and the thickness of the coating part when the coating part is regarded as springback is d0, The amount of springback generated in the coating part is Δd, the exponential function is e, the coefficient is k, the obtained number of times of the specific location is t, Δd = d0−dp, and the second press by the second press device. When the thickness d of the coated part before pressing is given, the calculation formula is d = dp + Δd (1−e ^−kt ).

According to this, the thickness of the coating part before the 2nd press can be rapidly estimated using a computing equation.
A manufacturing apparatus for solving the above-described problems includes a first press roll that presses a long strip-shaped member from a direction intersecting the surface of the strip-shaped member, and the first roll in the transport direction along the longitudinal direction of the strip-shaped member. A thickness acquisition device that is disposed on the downstream side of one press roll and acquires the thickness of the strip-shaped member; and is disposed on the downstream side of the thickness acquisition device in the transport direction of the strip-shaped member, and the strip-shaped member is A second press roll that presses from a direction intersecting the surface; a drive device that changes an interval between the second press rolls; and a control device that is connected to the drive device. It is arranged in at least three places above, and the control device controls the driving device based on the thickness acquired by the thickness acquisition device.

  According to this, the control device controls the driving device based on the thickness acquired by the three thickness acquisition devices after the first press by the first press roll, and the control of the driving device controls the second press roll. The interval can be changed. That is, by obtaining three values of the thickness of the belt-shaped member, it is possible to estimate the thickness that predicts the amount of springback of the belt-shaped member, and the estimated thickness can be reflected in the interval between the second press rolls. . Therefore, variation in the thickness of the belt-shaped member due to the spring back can be suppressed.

  According to the present invention, it is possible to suppress variations in the thickness of the strip-shaped member after pressing.

The perspective view which shows the electrode of embodiment. The figure which shows the production facility of embodiment typically. The figure which shows typically the manufacturing apparatus of the electrode of embodiment. The graph which shows the thickness of the coating part after the 1st time and the 2nd press, and the relationship of time. (A)-(c) is a figure which shows typically the 1st press and the thickness measurement of a specific place. The schematic diagram which shows the 2nd press.

Hereinafter, an embodiment embodying a manufacturing apparatus will be described with reference to FIGS.
Although not shown, the secondary battery as the power storage device is a rectangular battery having a rectangular external appearance, and is a lithium ion battery. The secondary battery includes an electrode assembly in a case. The electrode assembly is a stacked type in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked with a porous resin separator interposed therebetween and insulated.

  As shown in FIG. 1, the electrode 10 for a secondary battery includes a metal foil 11 as a rectangular current collector and a rectangular active material layer 12 present on both surfaces of the metal foil 11. The metal foil 11 of the positive electrode 10 is made of, for example, aluminum foil, and the metal foil 11 of the negative electrode 10 is made of, for example, copper foil. The active material layer 12 of the positive electrode 10 is formed by drying and compressing a positive electrode active material mixture. The positive electrode active material mixture includes a positive electrode active material, a conductive agent, a binder, and A kneaded solvent is used. The active material layer 12 of the negative electrode 10 is formed by drying and compressing a negative electrode active material mixture. The negative electrode active material mixture includes a negative electrode active material, a conductive agent, a binder, and a solvent. A kneaded product is used.

  The electrode 10 has an uncoated portion 12a along which the active material layer 12 does not exist and the metal foil 11 is exposed. And the electrode 10 has the current collection tab 14 of the shape protruded from a part of one side of the uncoated part 12a.

Next, a method for manufacturing the electrode 10 will be described.
The manufacturing method of the electrode 10 is a well-known manufacturing method. The manufacturing method of the electrode 10 includes a coating process in which an active material mixture is applied to the strip-shaped long metal foil 16 forming the metal foil 11 of the electrode 10 and then dried to form the coating part 18; 18 press process, the vacuum drying process of the coating part 18, and the punching process which punches the electrode material 17 as a strip | belt-shaped member provided with the long metal foil 16 and the coating part 18 in the shape of an electrode.

  As shown in FIG. 2, the production facility 20 for manufacturing the electrode 10 is coated with an active material mixture on one side of a long metal foil 16 by a coating device 23 and then dried with a drying device 30. This is equipment for forming the portion 18. In addition, what mixed the active material, the electrically conductive agent, the binder, and the solvent is used for an active material mixture.

  In the production facility 20, the long metal foil 16 is wound around the supply reel 21 with the longitudinal direction extending in the circumferential direction of the supply reel 21. The supply reel 21 is rotatably supported by a support device (not shown). The long metal foil 16 is wound around the take-up reel 22 with the longitudinal direction extending in the circumferential direction of the take-up reel 22. The take-up reel 22 is rotatably supported by a support device (not shown). The take-up reel 22 rotates at a constant rotation speed and takes up the long metal foil 16 on which the coating part 18 is formed. Therefore, when the long metal foil 16 supplied from the supply reel 21 is wound around the take-up reel 22, the long metal foil 16 is transported along the transport direction X1.

  The coating device 23 includes a slit die 23 a, and a discharge port (not shown) of the slit die 23 a is disposed to face one side of the long metal foil 16. In addition, in the coating apparatus 23, the coating method of the active material mixture may be other than the slit die method. In the coating process, the active material mixture is continuously applied to one side of the long metal foil 16 fed from the supply reel 21 from the discharge port of the slit die 23a. The active material mixture layer is formed in a long shape extending in the longitudinal direction of the long metal foil 16.

  The drying device 30 includes a dryer 30a. The dryer 30a heats air with heat from a heat source and supplies hot air. And in a coating process, the layer of the active material mixture on the elongate metal foil 16 which passes the dryer 30a is dried with the hot air supplied inside the dryer 30a. As a result, the solvent contained in the active material mixture evaporates, and the curing of the binder is started by heat, the active material and the conductive agent are fixed to each other, and the coating portion 18 is formed. In addition, although not shown in figure, after that, the coating part 18 is formed in the other side of the elongate metal foil 16 by the method similar to the above. Then, the electrode material 17 which has the coating part 18 on both surfaces of the elongate metal foil 16 is formed. The electrode material 17 having the coating part 18 on both sides is wound up on an electrode supply reel (not shown).

  As shown in FIG. 3, the pressing process is performed by a manufacturing apparatus 40 to be described later, and the coating portion 18 formed on both surfaces of the electrode material 17 is compressed from the surface to the inside until a predetermined density is reached. Thereafter, the electrode material 17 is accommodated in a vacuum drying furnace (not shown) by a vacuum drying process, and a slight solvent remaining in the coating part 18 is removed by pressure reduction and heating. Thereafter, by the punching process, the electrode 10 is cut into a shape, the active material layer 12 is formed from the coated portion 18, and the uncoated portion 12 a and the current collecting tab 14 are formed from portions other than the coated portion 18. The electrode 10 is manufactured.

Next, the manufacturing apparatus 40 will be described.
The manufacturing apparatus 40 includes a transport device (not shown), and the electrode material 17 having the coating portion 18 formed on both sides is supplied from the electrode supply reel and transported in the transport direction X2 by the transport device (not shown).

  As illustrated in FIG. 3, the manufacturing apparatus 40 includes a plurality of guide rollers arranged in parallel along the transport direction X2. The plurality of guide rollers are configured to meander the electrode material 17 between the guide rollers to increase the path length and to increase the transport time of the electrode material 17. For this reason, although it is preferable that the number of guide rollers is large so that a long path length can be ensured, in the present embodiment, in order to make the description easy to understand, the configuration is simplified to include three guide rollers.

  In the present embodiment, the manufacturing apparatus 40 includes a first guide roller 41a, a second guide roller 41b disposed downstream of the first guide roller 41a in the transport direction X2, and a second guide roller 41b. Also includes a third guide roller 41c disposed on the downstream side in the transport direction X2. The direction of the electrode material 17 supplied from the electrode supply reel and conveyed in the lateral direction is changed by the first guide roller 41a so as to be conveyed upward. The direction of the electrode material 17 is changed so as to be conveyed downward by the second guide roller 41b, and the direction is changed so as to be conveyed in the lateral direction by the third guide roller 41c.

  A region from the first guide roller 41a to the third guide roller 41c via the second guide roller 41b is defined as a path adjustment region C of the electrode material 17. The second guide roller 41 b is configured to be movable in the vertical direction. When the second guide roller 41 b moves upward, the second guide roller 41 b pushes up the electrode material 17. Then, the path length of the electrode material 17 in the path adjustment region C becomes longer than before the movement. On the other hand, as shown by a two-dot chain line in FIG. 3, when the second guide roller 41b moves downward, the amount of the electrode material 17 pushed up by the second guide roller 41b decreases, and the electrode material in the path adjustment region C is reduced. 17 is shortened. Therefore, the first to third guide rollers 41 a to 41 c constitute a path length adjusting device that adjusts the path length of the electrode material 17. In addition, in order to lengthen the path length of the electrode material 17 and further increase the transport time of the electrode material 17 in the path adjustment region C, four or more guide rollers are arranged in an annular shape, and each guide roller is moved up and down. The path length may be increased.

  The manufacturing apparatus 40 includes a first press device 44 upstream of the first guide roller 41a in the transport direction X2. The first press device 44 includes a pair of first press rolls 45 that press the coating unit 18 from a direction intersecting the surface of the coating unit 18.

  The pair of first press rolls 45 have the same roll diameter (diameter), the same axial length, and the same. Each first press roll 45 includes a cylindrical roll portion 45a and a rotation shaft 45b that rotates integrally with the roll portion 45a. Both end portions in the axial direction of each rotating shaft 45b are rotatably supported by the bearing box 46. A hydraulic cylinder 47 is connected to each bearing box 46. The hydraulic cylinder 47 has a piston 47b built in the cylinder tube 47a and a rod 47c connected to the piston 47b. The rod 47c can protrude and retract from the cylinder tube 47a in accordance with the movement of the piston 47b in the cylinder tube 47a. The projecting end of the rod 47 c from the cylinder tube 47 a is connected to the bearing box 46.

  The manufacturing apparatus 40 includes a first control device 48, and the first control device 48 controls the amount of movement of the piston 47b by controlling the amount of hydraulic oil supplied to and discharged from the hydraulic cylinder 47. Then, the first control device 48 controls the pair of hydraulic cylinders 47, thereby controlling the gap G1 that is the distance between the pair of first press rolls 45.

  The manufacturing apparatus 40 includes a second press device 50 on the downstream side in the transport direction X2 with respect to the third guide roller 41c. The second press device 50 includes a pair of second press rolls 51 that press the coating unit 18 from the direction intersecting the surface of the coating unit 18.

  The pair of second press rolls 51 have the same roll diameter (diameter), the same axial length, and the same. Each second press roll 51 includes a cylindrical roll portion 51a and a rotation shaft 51b that rotates integrally with the roll portion 51a. Both end portions of each rotating shaft 51b in the axial direction are rotatably supported by the bearing box 52. A hydraulic cylinder 53 is connected to each bearing box 52. The hydraulic cylinder 53 has a piston 53b built in the cylinder tube 53a and a rod 53c connected to the piston 53b. The rod 53c can protrude and retract from the cylinder tube 53a according to the movement of the piston 53b in the cylinder tube 53a. The protruding end of the rod 53c from the cylinder tube 53a is connected to the bearing box 52.

  The manufacturing apparatus 40 includes a second control device 54, and the second control device 54 is connected to the hydraulic cylinder 53. The second control device 54 controls the amount of movement of the piston 53 b by controlling the amount of hydraulic oil supplied to and discharged from the hydraulic cylinder 53. Then, by controlling the pair of hydraulic cylinders 53 by the second control device 54, the gap G2 that is the distance between the pair of second press rolls 51 is controlled. By controlling the gap G2, the pressing amount of the electrode material 17 (the coating part 18) is controlled. Therefore, in this embodiment, the hydraulic cylinder 53 constitutes a drive device that can change the press amount of the electrode material 17. A second guide roller 41b is connected to the second control device 54 in a signal manner, and the vertical position of the second guide roller 41b is controlled by the control of the second control device 54.

  The manufacturing apparatus 40 includes a thickness acquisition device 55 on the downstream side of the first pressing device 44 in the transport direction X2 and on the upstream side of the first guide roller 41a. The thickness acquisition device 55 includes a first sensor 55a, a second sensor 55b disposed downstream of the first sensor 55a in the transport direction X2, and a third sensor disposed downstream of the second sensor 55b in the transport direction X2. Sensor 55c. That is, the thickness acquisition device 55 is disposed at three locations on the transport path of the electrode material 17. The first to third sensors 55 a to 55 c measure and acquire the thickness of the coating part 18 immediately after pressing by the first press device 44. The first to third sensors 55a to 55c are non-contact type laser thickness measuring devices, but for example, contact type displacement sensors may be used.

  The first sensor 55a and the second sensor 55b are disposed at a certain distance along the conveyance direction X2, and the second sensor 55b and the third sensor 55c are disposed at a certain distance along the conveyance direction X2. Yes. Further, the first to third sensors 55a to 55c are arranged at the same distance from the edge of the electrode material 17 in the width direction of the conveyance path orthogonal to the conveyance direction X2, and are applied to the coating unit 18 to be conveyed. The thickness of one point of the specific place P can be measured in order.

  As shown in FIG. 4 or FIG. 5A, when the time t1 has passed immediately after the first press by the first press roll 45, the thickness of the specific location P is measured by the first sensor 55a. Further, as shown in FIG. 4 or FIG. 5 (b), when the time t2 has passed immediately after pressing, the specific location P is transported to a position facing the second sensor 55b, and the thickness of the specific location P is determined by the second sensor 55b. Measured by. Further, as shown in FIG. 4 or FIG. 5 (c), when the time t3 elapses immediately after pressing, the specific place P is transported to a position facing the third sensor 55c, and the thickness of the specific place P is set to the third sensor 55c. Measured by.

  In addition, the conveyance speed of the electrode material 17 is set to be constant in advance. For this reason, by calculating in advance the distance multiplied by the conveyance speed and the time elapsed immediately after pressing by the first press roll 45, and arranging the first to third sensors 55a to 55c according to the calculated distance, The thickness measurement of the specific place P by the first to third sensors 55a to 55c can be performed.

  The first to third sensors 55a to 55c are signal-connected to the second control device 54 of the second press device 50. Then, the thickness of the specific location P acquired by the first to third sensors 55 a to 55 c is input to the second control device 54.

Next, control of the second control device 54 will be described together with the operation of the electrode 10 manufacturing device 40.
The second control device 54 estimates the thickness of the coating portion 18 that predicts the springback that occurs after the first press, based on the thickness of the specific location P measured three times. As shown in FIG. 4, the amount of springback is greatest immediately after the first press and gradually decreases with time. For this reason, immediately after the first press, the thickness of the coating portion 18 becomes the smallest, and the thickness gradually increases with the passage of time due to the springback. And finally, the amount of springback becomes very small.

  The thickness of the coating part 18 immediately after the first press by the first press roll 45 of the first press device 44 is dp, and the thickness that is regarded as the completion of springback is d0. Further, the number of thickness measurements performed immediately after pressing is t. When the amount of springback generated after the first press is Δd, Δd = d0−dp. This Δd is the largest immediately after the first press and gradually decreases with time.

  And in the coating part 18, the thickness d of the coating part 18 before the 2nd press by the 2nd press roll 51 of the 2nd press apparatus 50 is computed by the following arithmetic expressions. Note that e is an exponential function. The coefficient k is determined from the thickness of the specific place P measured when the times t1, t2, and t3 have passed since the first press.

d = dp + Δd (1−e ^−kt )... Operational formula The thickness d of the coated part where the springback is predicted is calculated by the arithmetic expression. The calculation of the thickness d is performed by the second control device 54. Therefore, the 2nd control apparatus 54 estimates the thickness d of the coating part 18 using the thickness acquired over 3 times, and a computing equation.

  And as shown in FIG. 6, the 2nd control apparatus 54 is estimated thickness d so that the thickness of the coating part 18 obtained after the 2nd press may become the preset target thickness dx. The press amount for the coating portion 18 is estimated. The estimation of the press amount is derived from a table in which the thickness d and the press amount are correlated, a database, or the like. Even after the second press, a spring back is generated in the coating portion 18, but since the spring back amount at this time is very small, when estimating the press amount, the second spring back amount is Don't add it.

  The second control device 54 adjusts the interval (gap G2) between the second press rolls 51 by controlling the amount of hydraulic oil supplied to and discharged from the hydraulic cylinder 53 so that the estimated press amount is obtained. A second press of the electrode material 17 (coating part 18) is performed. That is, the second control device 54 reflects (feeds forward) the thickness of the coating unit 18 after the first press on the second press by the second press device 50.

  In addition, a pair of 2nd press roll 51 moves the same amount toward the coating part 18, and it presses so that the same press load may be applied from the both surfaces side of the elongate metal foil 16. FIG. In the second press, the coated portion 18 is pressed with a press amount that takes into account the spring back, so the second press amount is smaller than the first press amount.

  Further, the second control device 54 adjusts the time until the press place reaches the second press based on the thickness d calculated by the arithmetic expression. That is, the second control device 54 increases the path length of the electrode material 17 in the path adjustment region C so that the spring back approaches the completion before the second press as the estimated spring back amount increases. . On the other hand, the second control device 54 does not increase the path length of the electrode material 17 in the path adjustment region C unless the estimated amount of springback is small.

According to the above embodiment, the following effects can be obtained.
(1) In the manufacturing apparatus 40 of the electrode 10, after the electrode material 17 is pressed by the first press roll 45 of the first press apparatus 44, the thickness of the specific place P in the coating part 18 is measured three times, Based on the measured thickness, the thickness d (the thickness d of the coated portion 18 before the second press) that is predicted for the amount of springback that occurs after the first press is estimated. Then, the second control device 54 controls the hydraulic cylinder 53 so that the thickness obtained after the second press by the second press roll 51 of the second press device 50 becomes the target thickness dx. 2 Press amount by the press roll 51 was adjusted. For this reason, even if the spring back is generated in the coating portion 18 after the first press, and the spring back varies due to the density of the active material, the press conditions, etc., the press corresponding to the spring back can be performed. Thus, variation in thickness in the obtained coating part 18 can be suppressed.

  (2) Since the first press by the first press roll 45 of the first press device 44 reduces the thickness of the coating part 18 at a stretch, the spring back is large and the thickness of the coating part 18 is likely to vary. However, the second press by the second press roll 51 of the second press device 50 is a press that takes into account the spring back, and the amount of press of the coating unit 18 can be reduced compared to the first press, and the coating unit The thickness variation of 18 is suppressed, and the thickness of the coating portion 18 is easily set to a target thickness.

  (3) Immediately after the first press, the thickness d of the specific part P in the coating part 18 is measured three times, and the thickness d of the coating part 18 in which spring back is predicted using an arithmetic expression based on the measured value. Was calculated. For this reason, since the thickness d of the coating part 18 is calculated using the actual measurement value, the calculated thickness d can be brought close to the actual measurement value, and the thickness after the second press can be brought close to the target thickness dx. it can.

(4) Immediately after the first press, the thickness of the specific location P in the coating part 18 is measured three times, and based on this value, the spring back is calculated from the equation d = dp + Δd (1-e ^−kt ). The thickness d of the coating part 18 in consideration of the above is calculated. By using the arithmetic expression, it is possible to quickly calculate the thickness d of the coating portion 18 in which the spring back is predicted. As a result, variations in the thickness of the coating part 18 can be suppressed without reducing the productivity of the electrode 10.

  (5) The manufacturing apparatus 40 includes first to third guide rollers 41 a to 41 c that can adjust the path length of the electrode material 17 between the first press apparatus 44 and the second press apparatus 50. For this reason, it is possible to adjust the time from the coating unit 18 to the second press immediately after the first press. For this reason, by adjusting the path length of the electrode material 17 in accordance with the time required for the coating portion 18 to perform the spring back, the coating portion 18 close to the state where the spring back is completed is pressed during the second press. Compared with the electrode material in the middle of the springback, the accuracy of the thickness after the second press is improved.

  (6) The first press device 44 and the second press device 50 press the electrode material 17 while being conveyed by the press rolls 45 and 51. Therefore, for example, it is not necessary to stop the conveyance of the electrode material 17 at the time of pressing as in the case of pressing the coating part 18 with a flat press plate, and the productivity of the electrode does not decrease.

In addition, you may change the said embodiment as follows.
○ In the embodiment, the thickness acquisition of the specific location P in the coating unit 18 was performed by measuring the thickness at times t1, t2, and t3 that have passed since the first press. Not limited to this.

  For example, the thickness of the coating part 18 is simultaneously measured by the first to third sensors 55a to 55c at the time t1 that has passed since immediately after the first press. In this case, the thickness of the specific place P in the coating unit 18 is the thickness measured by the first sensor 55a. And the thickness of the coating part 18 measured with the 2nd sensor 55b turns into thickness of the location different from the specific location P. FIG. However, in the same lot in which the active material mixture and the metal foil are not exchanged, variations in the width direction are likely to occur, whereas in the longitudinal direction, the difference in conditions due to the difference in the location of the electrode material 17 is small. Therefore, the thickness of the coating part 18 measured by the second sensor 55b can be regarded as the thickness of the specific place P when passing the vicinity of the second sensor 55b after a predetermined time has elapsed. Similarly, the thickness of the coating part 18 measured by the third sensor 55c can be regarded as the thickness of the specific place P when passing the vicinity of the third sensor 55c after a predetermined time has elapsed. Therefore, the thickness d of the coating portion 18 may be calculated by predicting the springback amount using the thicknesses measured by the first to third sensors 55a to 55c in this way.

  ○ The thickness d of the coating part 18 that predicted spring back was calculated using an arithmetic expression, but the three measurement results set in advance by experiments and the thickness d predicted spring back were correlated. It may be derived from a table or database.

  O The path length adjusting device for the electrode material 17 by the first to third guide rollers 41a to 41c may be omitted. If the conveyance path between the first press device 44 and the second press device 50 is sufficiently long with respect to the variation in the amount of springback, the same effect can be obtained without the path length adjusting device. In addition, when the conveyance path between the first press device 44 and the second press device 50 is short, the electrode material 17 passes through the second press device 50 in a state where it is not sufficiently spring-backed. It is possible to calculate the thickness by predicting the amount of springback and reflect it to the second press device 50.

  O At least one of the 1st press apparatus 44 and the 2nd press apparatus 50 may press the coating part 18 by the press means different from a press roll. At least one of the first press device 44 and the second press device 50 may press the coating unit 18 with a flat press plate, for example.

○ Four or more locations may be used for measuring the thickness of the coating portion 18 immediately after the first press. The greater the number of measurement locations, the higher the accuracy of the calculated thickness d of the coating part 18.
The long current collector is not limited to the long metal foil 16 as long as the coating part 18 can be formed. For example, a woven or net-like sheet may be used.

The strip-shaped member that is pressed by the manufacturing apparatus may not be the electrode material 17 but may be a resin sheet.
The power storage device may be a nickel metal hydride secondary battery or an electric double layer capacitor.

The electrode material 17 may have a coating portion 18 on one side of the long metal foil 16.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

(A) A manufacturing apparatus including a path length adjusting device that adjusts a path length of the electrode material between the first press apparatus and the second press apparatus along the conveying direction of the electrode material.
(B) The first press device and the second press device are manufacturing devices provided with press rolls.

  P: Specific location, 10: Electrode, 16: Long metal foil as a current collector, 17 ... Electrode material as a band-shaped member, 18 ... Coating section, 40 ... Manufacturing device, 44 ... First press device, 45 DESCRIPTION OF SYMBOLS 1st press roll, 50 ... 2nd press apparatus, 51 ... 2nd press roll, 53 ... Hydraulic cylinder as drive apparatus, 54 ... 2nd control apparatus as control apparatus, 55 ... Thickness acquisition apparatus.

Claims (4)

A first member that has a coated portion of an active material mixture on at least one surface of a long current collector and presses a belt-shaped member conveyed in the longitudinal direction from a direction intersecting the surface of the coated portion. A press device;
A thickness acquisition device for acquiring the thickness of the coating part immediately after pressing by the first press device;
After the pressing by the first pressing device, the belt-shaped member is pressed from the direction intersecting the surface of the coating part, and a second pressing device capable of changing the pressing amount with a driving device;
A control device for controlling the drive device,
The thickness acquisition device acquires the thickness of the specific place in the coating part at least three times,
The said control apparatus controls the said drive device based on the thickness of the said specific place acquired at least 3 times, The manufacturing apparatus characterized by the above-mentioned.   The control device calculates the thickness of the coating portion by taking into account the springback amount at the specific location immediately after pressing by the first press device using an arithmetic expression, and based on the calculated thickness The manufacturing apparatus of Claim 1 which controls a drive device. When the thickness of the coating part immediately after pressing by the first pressing device is dp, and the thickness of the coating part when the coating part is regarded as being springback is d0, it occurs in the coating part. The coating before the second press by the second press device, wherein the spring back amount is Δd, the exponential function is e, the coefficient is k, the obtained number of times of the thickness at the specific location is t, and Δd = d0−dp. When the thickness d of the part is given, the calculation formula is
d = dp + Δd (1−e ^−kt )
The manufacturing apparatus according to claim 2. A first press roll that presses a long strip member from a direction intersecting the surface of the strip member;
A thickness acquisition device that is arranged on the downstream side of the first press roll in the transport direction along the longitudinal direction of the strip member, and acquires the thickness of the strip member;
A second press roll that is arranged on the downstream side of the thickness acquisition device in the transport direction of the belt-shaped member and presses the belt-shaped member from a direction intersecting the surface of the belt-shaped member;
A driving device for changing an interval between the second press rolls;
A control device connected to the drive device,
The thickness acquisition device is disposed at least at three locations on the conveyance path,
The said control apparatus controls the said drive device based on the thickness which the said thickness acquisition apparatus acquired, The manufacturing apparatus characterized by the above-mentioned.

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