JP6446982B2 - Laminate thickness detector - Google Patents

Description

The present invention relates to the thickness detection DeSo location of the stack.

  Vehicles such as EV (Electric Vehicle) and PHV (Plug in Hybrid Vehicle) are equipped with a secondary battery such as a lithium ion battery as a power storage device that stores electric power supplied to an electric motor serving as a prime mover. The secondary battery includes, in a case, an electrode assembly in which a positive electrode and a negative electrode are arranged in layers with a separator interposed therebetween. The structure of an electrode assembly of a lithium ion battery includes a stacked type and a wound type. In the stacked type, a plurality of positive electrodes and negative electrodes are stacked with a separator interposed therebetween. In addition, it is known to form a display unit on which identification information is displayed on the upper surface of a lid member of a battery cell, or to provide an identification body containing a luminescent material in a battery (Patent Documents 1 and 2) .

JP 2012-113854 A JP 2004-335229 A

  By the way, when a clearance gap arises between an electrode assembly and the inner wall of a case in a manufacturing process, inserting a spacer in a clearance gap is proposed. Even when the spacer is not used, in order to insert the electrode assembly into the case satisfactorily, it is preferable to measure in advance whether the thickness of the electrode assembly is as specified. However, when measuring the thickness of the electrode assembly, it is not preferable to make a measuring device or the like locally contact the surface of the electrode assembly. This is because it causes the peeling of the active material. On the other hand, for example, it is conceivable to measure the thickness in a state where the electrode assembly is sandwiched between a pair of restraining plates. However, in this case, in order to detect the thickness of the electrode assembly, the thickness information of the restraint plate being used is required.

An object of the present invention is to provide a thickness biopsy DeSo location of the stack capable of acquiring thickness information of the constraining plate.

The invention according to claim 1, a pair of restraining plates for restraining across the laminate consisting of several sheets from the stacking direction, the pair of restraining plate while constraining the laminate by the pair of restraining plate A thickness detection means for detecting the thickness of the laminated body sandwiched between the restraint plates, including the restraint plates, and the at least one of the pair of restraint plates A gist is provided with reading means for reading identification information relating to the thickness of the restraint plate.

According to the first aspect of the present invention, the pair of restraining plates are constrained by being sandwiched from the stacking direction of the laminated body composed of a plurality of sheets, and the pair of restraining plates is restrained by the pair of restraining plates by the holding member. The restraint plate is held. The reading unit reads the identification information regarding the thickness of the restraint plate applied to at least one of the pair of restraint plates. Therefore, it becomes possible to acquire the thickness information of the restraint plate by reading the identification information.

As described in claim 2, in the thickness detection DeSo location of the laminate of claim 1, wherein the thickness detecting means, the thickness measuring apparatus equipped with a thickness measurement for contact, restrained by the constraining plate It is preferable that a movable table for approaching the laminated body toward the thickness measuring contact, and a reading range of the reading unit is set in a moving path of the movable table.

As described in claim 3, in the thickness detection DeSo location of the laminate of claim 2, wherein the thickness measuring contacts extends downward, the movable table is moved in the vertical direction, the constraint The identification information may be given to the side surface of the plate.

As described in claim 4, in the thickness detection DeSo location of the laminate according to any one of claims 1 to 3, or when the identification information on each of the pair of restraining plate has been granted .

  According to the present invention, it is possible to acquire thickness information of the restraint plate.

The disassembled perspective view which shows the secondary battery of embodiment. The perspective view which shows the external appearance of the secondary battery of embodiment. The disassembled perspective view which shows the component of an electrode assembly. (A) is a plan view of the electrode assembly and its manufacturing jig, (b) is a front view of the electrode assembly and its manufacturing jig, and (c) is a side view of the electrode assembly and its manufacturing jig. . The exploded perspective view of an electrode assembly and its manufacturing jig. The longitudinal cross-sectional view of a thickness detection apparatus. The top view of an electrode assembly and its manufacturing jig. The longitudinal cross-sectional view of a thickness detection apparatus.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1 and FIG. 2, the secondary battery 10 is a lithium ion secondary battery, and includes a metal case 11 that constitutes the outline thereof. The case 11 includes a bottomed rectangular parallelepiped container 12 having an opening 12a on one surface and a lid 13 that closes the opening 12a. The container 12 has a rectangular bottom plate 12b, a short side wall 12c erected from a pair of opposed short side edges of the bottom plate 12b, and a long side wall 12d erected from a pair of opposed long side edges of the bottom plate 12b. Is provided. The case 11 contains an electrode assembly 14 and an electrolytic solution (not shown). The electrode assembly 14 has a rectangular parallelepiped shape as a whole, corresponding to the internal space of the container 12 having a rectangular parallelepiped shape.

  As shown in FIG. 3, the electrode assembly 14 as a laminate composed of a plurality of sheets has a rectangular sheet-like positive electrode 15 and a rectangular sheet-like negative electrode 19 with a separator 23 interposed therebetween. It is comprised by laminating | stacking. The separator 23 is made of a resin and is formed of a porous film through which lithium ions related to electric conduction can pass. The positive electrode 15 includes a rectangular positive electrode metal foil (for example, aluminum foil) 16 and a rectangular positive electrode active material layer 17 provided on both surfaces of the positive electrode metal foil 16. A positive current collecting tab 18 is provided on a part of the upper side of the positive electrode 15 so as to project a part of the positive metal foil 16.

  The negative electrode 19 has a rectangular negative electrode metal foil (for example, copper foil) 20 and a rectangular negative electrode active material layer 21 provided on both surfaces of the negative electrode metal foil 20. A negative electrode current collecting tab 22 is provided on a part of the upper side of the negative electrode 19 so as to project a part of the metal foil 20 for negative electrode.

  As shown in FIG. 1, the positive electrode 15, the negative electrode 19, and the separator 23 are arranged such that the positive electrode current collecting tabs 18 are arranged in a line along the electrode stacking direction and do not overlap the positive electrode current collecting tabs 18. The negative electrode current collecting tabs 22 are stacked so as to be arranged in a line along the stacking direction of the electrodes. Each positive electrode current collection tab 18 and each negative electrode current collection tab 22 are bent in a collected (bundled) state. Each positive current collecting tab 18 is electrically connected by welding the portions where the positive current collecting tabs 18 are overlapped, and the positive electrode conductive member 24 is connected to the positive current collecting tab 18. A positive electrode terminal 25 for taking out electricity from the electrode assembly 14 is connected to the positive electrode conductive member 24.

  Similarly, the negative electrode current collecting tabs 22 are electrically connected by welding the portions where the negative electrode current collecting tabs 22 are overlapped, and the negative electrode conductive member 26 is connected to the negative electrode current collecting tabs 22. A negative electrode terminal 27 for taking out electricity from the electrode assembly 14 is connected to the negative electrode conductive member 26. The positive electrode terminal 25 and the negative electrode terminal 27 penetrate the lid 13 and protrude out of the case 11, and the positive electrode terminal 25 and the negative electrode terminal 27 are insulated from the lid 13 by an insulating ring 28.

  When the length of the electrode assembly 14 along the electrode stacking direction is the thickness of the electrode assembly 14, the thickness of the electrode assembly 14 is adjusted so that the thickness is slightly smaller than the inner dimension of the case 11. .

  The thickness of the electrode assembly 14 is important in favor of the work of inserting the electrode assembly 14 into the case 11. However, there is a variation in the thickness of the electrode assembly 14 in which a large number of positive electrodes 15, negative electrodes 19, and separators 23 are laminated, and the difference between the thickness of the electrode assembly 14 and the internal dimensions of the case 11 increases. A gap is generated, and the electrode assembly 14 is rattled in the case 11. Accordingly, when the difference between the thickness and the internal dimension becomes large, as shown in FIG. 1, the spacer 96 made of a resin sheet is inserted by an appropriate number of one to a plurality. However, the thickness adjusted by the spacer is a small value, for example, 1 mm or less, and in order to set the number of spacers 96 (thickness) to be inserted, it is necessary to measure the precise thickness of the electrode assembly 14 in advance. is there.

Next, the electrode assembly manufacturing jig 40 will be described.
As shown in FIGS. 4 and 5, the electrode assembly manufacturing jig 40 includes a pair of constraining plates 50 and 60 made of a metal plate, a bolt 41 and a female screw portion 52 as holding members. The pair of restraining plates 50 and 60 restrains the electrode assembly 14 from being sandwiched in the electrode stacking direction. The pair of restraining plates 50 and 60 are held by the bolt 41 and the female screw portion 52 in a state where the electrode assembly 14 is restrained by the pair of restraining plates 50 and 60. Furthermore, a load in the electrode stacking direction can be applied to the electrode assembly 14 by the load applying device 70 (see FIG. 4B).

  The constraining plates 50 and 60 have a substantially rectangular shape. As shown in FIG. 4A, the short sides of the constraining plates 50 and 60 are in the positive electrode active material layer 17 of the electrode assembly 14 (rectangular positive and negative electrodes). Alternatively, the width of the negative electrode active material layer 21 is wider than the short side direction, and the longitudinal directions of the restraining plates 50 and 60 are wider than the longitudinal direction of the electrode assembly 14. As shown in FIG. 5, a pair of projecting portions 51 are formed at both ends of the restraint plate 50 in the longitudinal direction from the electrode assembly 14. It is provided at intervals in the short direction. Further, as shown in FIG. 5, a pair of projecting portions 61 are formed at both ends in the longitudinal direction at a portion projecting from the electrode assembly 14 in the longitudinal direction of the constraining plate 60. 60 are provided at intervals in the short direction. Of the pair of restraining plates 50, 60, one restraining plate 50 includes a female screw portion 52 as a holding member near the tip of each projecting portion 51, and the other restraining plate 60 is near the tip of each projecting portion 61. An insertion hole 62 is provided.

  The bolt 41 is made of resin. The bolt 41 is inserted into the insertion hole 62 with the electrode assembly 14 sandwiched between the one restraint plate 50 and the other restraint plate 60 and is screwed into the female screw portion 52. The state where the electrode assembly 14 is sandwiched between the restraint plates 50 and 60 can be held by screwing the bolt 41 to the female threaded portion 52, and the distance between the pair of restraint plates 50 and 60 can be fixed. Yes.

  As shown in FIG. 4B, the load applying device 70 is placed on the electrode assembly 14 with the electrode assembly 14 sandwiched between the one restraint plate 50 and the other restraint plate 60. A load F can be applied to the electrode assembly 14 from the other restraint plate 60. The load applying device 70 includes a pressing member 71 that is a pressing device, and the pressing member 71 can move forward and backward with respect to the restraining plates 50 and 60. Further, when a load is applied to the electrode assembly 14 by the load applying device 70, the distance between the pair of restraining plates 50, 60 determined by the load application is fixed by screwing the bolt 41 into the female thread portion 52, Can be maintained.

  FIG. 6 shows a thickness detecting device 79 for manufacturing an electrode assembly as thickness detecting means, and the thickness detecting device 79 can detect the thickness of the electrode assembly 14 as a laminated body composed of a plurality of sheets. .

  The automatic thickness detection device 79 includes a thickness measurement device 80, a movable base 81, and a ceiling member 82. The thickness measuring device 80 includes a thickness measuring contact 83. The thickness measuring contact 83 extends downward. The movable table 81 moves in the vertical direction.

  FIG. 7 shows thickness measurement points P1, P2, P3, and P4 in the electrode assembly 14 sandwiched between the restraining plates 50 and 60. FIG. As shown in FIG. 7, the thickness detector 79 measures the thicknesses of the four measurement points P1, P2, P3, and P4 in the electrode assembly 14 sandwiched between the restraining plates 50 and 60.

  As shown in FIG. 8, the electrode assembly 14 sandwiched between the restraining plates 50 and 60 is placed on the movable table 81. The ceiling member 82 has a U-shaped cross section, and the bottom surface is open. The movable base 81 moves upward toward the lower surface opening of the ceiling member 82. That is, the movable base 81 brings the electrode assembly 14 restrained by the restraining plates 50 and 60 toward the thickness measuring contact 83. Then, as shown in FIG. 6, the movable base 81 comes into contact with the lower surface opening of the ceiling member 82 and stops.

  As shown in FIG. 8, four thickness measuring contacts 83 are supported on the ceiling member 82 so as to be movable up and down. Then, as shown in FIG. 6, the measurement is performed in the electrode assembly 14 in which the lower ends of the four thickness measuring contacts 83 are in contact with the upper restraining plate 60 and are sandwiched between the restraining plates 50 and 60 by the positions. The thickness t1 of the locations P1, P2, P3, P4 (see FIG. 7) is measured. The thickness t4 of the electrode assembly 14 can be calculated by subtracting the thickness t2 of the restraint plate 50 and the thickness t3 of the restraint plate 60 as shown in FIG. 6 from the thickness t1 at the measurement points P1, P2, P3, P4. . Specifically, the average thickness of the electrode assembly 14 at the measurement points P1, P2, P3, and P4 is calculated.

  As shown in FIG. 5, of the side surfaces extending in the longitudinal direction of the restraining plates 50 and 60, the side opposite to the side where the tabs 18 and 22 of the electrode assembly 14 are arranged are side surfaces 53 and 63. A bar code 90 as identification information regarding the thickness of the restraining plate 50 is provided on the side surface 53 of the restraining plate 50 so as to be readable from the outside. Further, a barcode 91 as identification information regarding the thickness of the restraint plate 60 is provided on the side surface 63 of the restraint plate 60 so as to be readable from the outside. Specifically, the barcodes 90 and 91 are one-dimensional barcodes in which bars or spaces are arranged one-dimensionally in the longitudinal direction of the constraint plates 50 and 60, and a film material on which a mark is printed is applied to the constraint plates 50 and 60. Pasted and configured.

  The barcode 90 is associated with a unique ID. Similarly, the barcode 91 is associated with a unique ID. On the other hand, in the database, the thickness at each measurement location P1 to P4 on the restraint plate 50 is registered in association with a unique ID. Similarly, in the database, the thickness at each measurement location P1 to P4 on the restraint plate 60 is registered in association with the unique ID. Then, the thickness at the measurement points P1, P2, P3, P4 on the restraint plate 50 corresponding to the corresponding ID can be acquired by reading the barcode 90 and accessing the database using a computer or the like. Yes. Similarly, by reading the barcode 91 and accessing the database using a computer or the like, the thickness at the measurement points P1, P2, P3, and P4 on the restraint plate 60 corresponding to the corresponding ID can be acquired. ing.

  As shown in FIG. 8, a barcode reader 95 as a reading means is fixed near the lower surface opening of the ceiling member 82 in the thickness detecting device 79. That is, the reading range of the barcode reader 95 is set in the moving path of the movable table 81. The barcodes 90 and 91 can be read by the barcode reader 95 when the movable table 81 moves upward and approaches the lower surface opening of the ceiling member 82. That is, the barcode reader 95 can read the barcodes 90 and 91 applied to the pair of restraining plates 50 and 60. At this time, in a state where the electrode assembly 14 is sandwiched between the restraining plates 50 and 60, the bar codes 90 and 91 can be read to accurately measure the thickness t4 of the electrode assembly 14.

Next, the manufacturing method of the electrode assembly 14 will be described together with the operation.
First, as shown in FIG. 5, the electrode assembly 14 is laminated. Specifically, one constraining plate 50 is set, and the positive electrode 15, the separator 23, and the negative electrode 19 are stacked on the constraining plate 50 by a laminating device (not shown). As a result, the electrode assembly 14 is formed on one restraint plate 50, the pair of projecting portions 51 project, and the female screw portion 52 is exposed. In addition, a lamination apparatus uses a well-known technique, for example, is a transfer apparatus which uses a suction pad.

  Next, as shown in FIG. 4, a step of sandwiching the electrode assembly 14 with a pair of restraining plates 50 and 60 from the electrode stacking direction is performed. That is, the other restraining plate 60 is placed on the upper surface of the electrode assembly 14 in a state where the electrode assembly 14 is formed at a predetermined position on the restraining plate 50.

  Then, the bolt 41 is inserted into each insertion hole 62 of the other restraining plate 60, and the bolt 41 is screwed into each female screw portion 52 of the one restraining plate 50. Then, the electrode assembly 14 can be sandwiched by the pair of restraining plates 50 and 60 from both sides in the electrode stacking direction. The bolt 41 is screwed into a state where it can be tightened without being screwed into the female screw portion 52 strongly.

  Next, a step of applying a load to the sandwiched electrode assembly 14 in the electrode stacking direction is performed. Specifically, as shown in FIG. 4B, the pressing member 71 of the load applying device 70 moves forward toward the other restraining plate 60, and the load applying device 70 passes through the other restricting plate 60. A predetermined load is applied to the assembly 14 in the electrode stacking direction. Then, the other restraint plate 60 moves toward the one restraint plate 50 along the axial direction of the bolt 41 and is pressed against the electrode assembly 14. As a result, the thickness of the electrode assembly 14 decreases. Then, after the electrode assembly 14 is stabilized, the bolt 41 is tightened with the load applied by the load applying device 70. Then, the electrode assembly 14 is sandwiched between the pair of restraining plates 50 and 60, and the distance between the pair of restraining plates 50 and 60, that is, the thickness of the electrode assembly 14 is fixed by the bolt 41 and the female screw portion 52. Maintained.

  Next, in the state where the electrode assembly 14 is sandwiched between the pair of restraining plates 50, 60 by screwing the female screw portion 52 and the bolt 41, that is, in the state where the distance between the pair of restraining plates 50, 60 is maintained. The process of canceling the provision of That is, the pressing member 71 of the load applying device 70 is retracted in a state where the bolt 41 is screwed to the female screw portion 52, and the load application to the electrode assembly 14 is released.

  As shown in FIG. 4, even when the load application is released, the distance between the pair of restraining plates 50 and 60 is maintained by the screwing of the bolt 41 and the female screw portion 52. For this reason, the compressed state of the electrode assembly 14 continues even after the load application is released. If this state is maintained for a long time, the positive electrode 15, the negative electrode 19, and the separator 23 are adapted to the compressed shape, and the springback (a phenomenon in which the thickness returns after the restraint is released) is gradually reduced.

  Next, while maintaining the clamping state with the bolt 41 and the female screw portion 52, the load applying device 70 is removed, the load applying device 70 and the electrode assembly 14 are placed separately, and the restraint plates 50 and 60 in the electrode assembly 14 are removed. The exposed part is fixed with a holding tape (not shown) or the like.

  Thereafter, the thickness t4 of the electrode assembly 14 is measured. Specifically, as shown in FIG. 8, the electrode assembly 14 sandwiched between the restraining plates 50 and 60 is placed on the movable base 81 of the thickness detection device 79. When the movable table 81 moves upward toward the lower surface opening of the ceiling member 82 and the movable table 81 contacts the ceiling member 82 as shown in FIG. 6, the movable table 81 stops. Then, the four thickness measuring contacts 83 move downward, and the lower ends of the thickness measuring contacts 83 come into contact with the upper restraining plate 60, and the height of the thickness measuring contact 83 at that time is reached. The thickness t1 at the measurement points P1, P2, P3, and P4 (see FIG. 7) in the electrode assembly 14 sandwiched between the restraining plates 50 and 60 depending on the position is measured. When the movable table 81 moves upward and approaches the lower surface opening of the ceiling member 82, the barcode is fixedly arranged with respect to the workpiece (the electrode assembly 14, the restraining plates 50 and 60) that moves upward. The barcodes 90 and 91 are read by the reader 95. Then, the thicknesses t2 and t3 of the measurement points P1 to P4 of the restraining plates 50 and 60 are calculated by referring to the database from the IDs of the barcodes 90 and 91 by a computer or the like. Further, the thickness t4 of the electrode assembly 14 is calculated by subtracting the thickness t2 of the restraint plate 50 and the thickness t3 of the restraint plate 60 from the thickness t1 at the measurement locations P1, P2, P3, and P4.

  Thus, since the bar codes 90 and 91 which can refer to the thickness of the restraint plates 50 and 60 are given to the restraint plates 50 and 60, the electrode assembly 14 is sandwiched between the pair of restraint plates 50 and 60. The thickness t4 of the electrode assembly 14 can be accurately calculated by taking the difference. Further, as shown in FIG. 8, when the movable table 81 is moved upward, that is, in the middle of the measurement process, reading is performed, which is advantageous in terms of time and cost reduction.

  After the thickness of the electrode assembly 14 is measured, the jigs (restraining plates 50, 60) are removed from the electrode assembly 14, and an appropriate number of spacers 96 are stacked if a spacer 96 (see FIG. 1) is necessary. Secure with tape. The electrode assembly 14 is placed in the case 11.

According to the above embodiment, the following effects can be obtained.
(1) As a configuration of a manufacturing jig for restraining the electrode assembly 14 as a laminate composed of a plurality of sheets, a pair of restraining plates 50 and 60 that restrain the electrode assembly 14 by sandwiching the electrode assembly 14 from the laminating direction; A bolt 41 and a female thread portion 52 are provided as holding members that hold the pair of restraint plates 50 and 60 in a state where the electrode assembly 14 is restrained by the restraint plates 50 and 60. Bar codes 90 and 91 as identification information relating to the thickness of the restraint plates 50 and 60 are provided to the pair of restraint plates 50 and 60 so as to be readable from the outside. Therefore, when measuring the thickness of the electrode assembly 14 during the production of the electrode assembly 14, it is possible to acquire accurate thickness information of the restraining plates 50 and 60 by reading the barcodes 90 and 91. . That is, the thickness of the electrode assembly 14 body can be calculated and obtained by measuring the thickness of the electrode assembly 14 restrained by the restraining plates 50 and 60 without contacting the measuring instrument with the surface of the electrode assembly 14. I can do it.

  (2) Bar codes 90 and 91 are provided on the side surfaces 53 and 63 of the restraining plates 50 and 60, respectively. Therefore, as shown in FIG. 8, the barcode reader 95 does not interfere with the restraining plates 50 and 60 in the thickness measuring step, and it becomes easy to read. In addition, when a barcode is applied to the upper surface of the restraint plates 50 and 60 (specifically, when a film material on which a mark is printed is pasted), the thickness increases by that portion, which affects the thickness measurement. Since the bar codes 90 and 91 are given to the side surfaces 53 and 63 of the 50 and 60, there is no influence.

  (3) Since the bar codes 90 and 91 are given to each of the pair of restraint plates 50 and 60, the combination of the restraint plates 50 and 60 is changed when a plurality of pairs of restraint plates 50 and 60 are used. Even so, the thickness can be detected, which is practical.

  (4) As a configuration of a manufacturing apparatus provided with a thickness detection device 79 as a thickness detection means for detecting the thickness of the electrode assembly 14 as a laminate composed of a plurality of sheets, the electrode assembly 14 is restrained by being sandwiched from the stacking direction. A pair of restraining plates 50 and 60 are provided. Furthermore, the bolt 41 and the female screw portion 52 as holding members for holding the pair of restraint plates 50 and 60 in a state where the electrode assembly 14 is restrained by the pair of restraint plates 50 and 60, and the pair of restraint plates 50 and 60 are provided. And a barcode reader 95 as a reading means for reading the barcodes 90 and 91. Therefore, when the thickness adjustment is performed by an appropriate number of spacers 96 during the manufacture of the electrode assembly 14, the thickness information of the restraining plates 50 and 60 can be acquired by reading the barcodes 90 and 91. Become. That is, the thickness information of the restraining plates 50 and 60 can be acquired without adding information to the electrode assembly 14. In addition, the barcodes 90 and 91 can be read in the process of transferring the electrode assembly 14 restrained by the restraining plates 50 and 60 in the vertical direction.

  (5) The thickness detecting device 79 causes the thickness measuring device 80 including the thickness measuring contact 83 and the electrode assembly 14 restrained by the restraining plates 50 and 60 to approach the thickness measuring contact 83. Since the reading range of the bar code reader 95 is set in the movement path of the movable table 81, it is not necessary to move only to obtain the thickness information of the restraint plates 50 and 60. It is practical.

(6) The thickness measuring contact 83 extends downward, the movable base 81 moves in the vertical direction, and the bar codes 90 and 91 are provided on the side surfaces of the restraining plates 50 and 60, which is practical. .
In addition, you may change the said embodiment as follows.

  Although the barcodes 90 and 91 are provided on the side surfaces 53 and 63 of the restraint plate, a barcode (for example, a barcode indicated by the imaginary line 100 in FIG. 7) may be imparted to a flat portion of the restraint plate, for example, the upper surface. . The thickness information of the restraint plate 50 and the thickness information of the restraint plate 60 can be acquired from the barcode 100 of FIG. Reading may be performed by reading the information with a bar code reader disposed downward when the electrode assembly 14 restrained by the restraining plates 50 and 60 is moved in the horizontal direction.

A two-dimensional code such as a QR code (registered trademark) may be used instead of the barcodes 90 and 91.
-Although the barcode was given to the restraint board by sticking the film material which printed the mark, you may give a barcode to a restraint board instead of this by stamping directly on the board itself.

  -Although barcode 90,91 was provided to a pair of restraint plates 50 and 60, it is not restricted to this. A barcode may be given only to the restraining plate 50, or a barcode may be given only to the restraining plate 60. The point is that at least one of the pair of restraining plates 50 and 60 may be configured such that identification information (barcode or the like) relating to the thickness of the restraining plate is readable from the outside.

  -This invention is not limited to an electrode assembly, Thickness acquisition is attained in the state restrained by the restraint board with respect to the laminated body of a sheet-like thing. However, when it is not desired to contact a measuring device or the like locally on the surface of the multilayer body, for example, it is particularly suitable to be embodied in a nickel hydride secondary battery as a power storage device or an electrode assembly of an electric double layer capacitor. .

  DESCRIPTION OF SYMBOLS 14 ... Electrode assembly, 15 ... Positive electrode, 19 ... Negative electrode, 23 ... Separator, 40 ... Manufacturing jig, 41 ... Bolt, 50 ... Restraint plate, 52 ... Female thread part, 53 ... Side surface, 60 ... Restraint plate, 63 ... Side, 90 ... Bar code, 91 ... Bar code, 95 ... Bar code reader.

Claims (4)

A pair of restraint plates for restraining across the laminate consisting of several sheets from the stacking direction,
A holding member that holds the pair of restraint plates in a state where the laminate is restrained by the pair of restraint plates;
A thickness detecting means for detecting a thickness of the laminated body sandwiched between the restraining plates, including the restraining plate;
Thickness inspection DeSo location of the stack, characterized in that it comprises a reading means for reading the identification information on the pair of the at least one thickness of the constraining plate that is applied to the constraining plate. The thickness detecting means includes a thickness measuring device including a thickness measuring contact, and a movable base that moves the laminated body restrained by the restraining plate toward the thickness measuring contact, the movable table moving path, the thickness inspection DeSo location of the laminate of claim 1 in which the reading range of the reading unit is set. The laminate according to claim 2 , wherein the thickness measuring contact extends downward, the movable base moves in the vertical direction, and the identification information is given to a side surface of the restraining plate. thickness test DeSo location of. Thickness inspection DeSo location of laminate according to any one of claims 1 to 3, characterized in that the identification information on each of the pair of restraining plate is granted.