JP6984451B2 - Measuring device and measuring method - Google Patents

Description

The present invention relates to a measuring device and a measuring method.

A technique for measuring the length of a measurement object based on an image of the measurement object is known. For example, in the dimension measuring device (measuring device) described in Patent Document 1, a transport means for transporting a caterpillar block as a measurement target (measurement target) is provided, and a measurement target moving on the transport means is provided. Two cameras for taking images are provided. The length from the left end to the right end of the measurement object is measured by image processing the image including the left and right ends of the measurement object captured by the two cameras.

Japanese Unexamined Patent Publication No. 8-101017

By the way, there is a bipolar battery including an electrode laminate formed by laminating a plurality of bipolar electrodes. When constructing the electrode laminate, it is desired that the length of each of the plurality of bipolar electrodes is within a predetermined range. Therefore, in the manufacturing process of a plurality of bipolar electrodes, the length of each bipolar electrode may be measured.

Each bipolar electrode is composed of, for example, a metal foil and a positive electrode active material layer and a negative electrode active material layer formed by applying an active material on both sides of the metal foil, and the thickness of each bipolar electrode is thin. Therefore, when trying to measure the length of the bipolar electrode while the bipolar electrode is being conveyed by the conveying means as in the measuring device described in Patent Document 1, the end portion of the bipolar electrode (metal foil) is wound. It may rise and float upward. If the camera captures the image of the bipolar electrode with the end of the bipolar electrode floating upward, the length of the bipolar electrode may not be measured correctly.

The present invention provides a measuring device and a measuring method capable of improving the measurement accuracy of the length of a bipolar electrode.

The measuring device according to one aspect of the present invention includes an electrode plate, a first active material layer provided on the first surface of the electrode plate, and a second surface opposite to the first surface of the electrode plate. It is a measuring device for measuring the length of a bipolar electrode having two active material layers in the first direction. This measuring device is provided on a measuring table having a mounting surface on which a bipolar electrode is placed so that the first active material layer is in contact with the mounting surface, and one of the edges of the bipolar electrodes is in contact with each other. The first by imaging the bipolar electrode in the first imaging range including the first regulating member that regulates the mounting position of the bipolar electrode and the first edge extending along the second direction intersecting the first direction of the bipolar electrode. A second imaging unit that generates a second image by imaging the bipolar electrode in a second imaging range including a first imaging unit that generates an image and a second edge that faces the first edge of the bipolar electrode in the first direction. And a control unit that calculates the distance between the first edge and the second edge based on the first image and the second image.

In this measuring device, the measuring device was mounted on the mounting surface in a state where the mounting position was restricted by the contact of any edge of the bipolar electrode with the first regulating member provided on the mounting surface of the measuring table. The bipolar electrode is imaged. Further, the distance between the first edge and the second edge of the bipolar electrode is calculated based on the first image and the second image generated by imaging the bipolar electrode. The bipolar electrode is in contact with the first regulating member and is placed stationary on the mounting surface of the measuring table, and the bipolar electrode is imaged in the stationary state. Therefore, the possibility that the end portion of the bipolar electrode floats upward is reduced. As a result, it is possible to improve the measurement accuracy of the length of the bipolar electrode.

The first regulatory member may have a contact surface that intersects the mounting surface.

In this case, the mounting position of the bipolar electrode is restricted by bringing the edge of the bipolar electrode into contact with the contact surface. Therefore, the placement position of the bipolar electrode is more reliably regulated, and the inclination of the bipolar electrode in a plan view is regulated. As a result, the bipolar electrode can be easily placed at a measurable mounting position.

The measuring device may further include a pair of second regulatory members provided on the mounting surface and extending along a direction intersecting the contact surface. The separation distance between the pair of second regulating members may be larger than the design value of the length of the bipolar electrode in the first direction.

In this case, by mounting the bipolar electrode between the pair of second regulating members, the mounting position of the bipolar electrode in the direction in which the pair of second regulating members face each other is restricted. Therefore, the bipolar electrode can be more easily arranged at the measurable mounting position.

The measuring device may further include a presser member that has a contact surface in contact with the second active material layer and presses the bipolar electrode toward the mounting surface.

In this case, the bipolar electrode is pressed toward the mounting surface while being sandwiched between the mounting surface of the measuring table and the contact surface of the pressing member. Therefore, even if the end portion of the bipolar electrode tries to float upward, the movement of the bipolar electrode is suppressed by the contact surface of the pressing member. As a result, it is possible to further suppress the end portion of the bipolar electrode from floating upward, so that it is possible to further improve the measurement accuracy of the length of the bipolar electrode.

The first imaging range may include a third edge extending along the first direction of the bipolar electrode. The control unit may calculate the angle formed by the first edge and the third edge based on the first image.

In this case, it is possible to determine whether or not the corner portion of the bipolar electrode including the first edge and the third edge has a desired angle.

The first imaging range may include a fourth edge extending along the second direction of the second active material layer. The control unit may calculate the distance between the first edge and the fourth edge based on the first image.

In this case, it is possible to determine whether or not the second active material layer is formed at a desired position with respect to the electrode plate.

The measuring method according to the other aspect of the present invention is provided on the electrode plate, the first active material layer provided on the first surface of the electrode plate, and the second surface opposite to the first surface of the electrode plate. It is a measurement method for measuring the length of a bipolar electrode having a second active material layer in the first direction. This measurement method includes a mounting step of mounting the bipolar electrode on the mounting surface so that the first active material layer comes into contact with the mounting surface of the measuring table, and a second direction intersecting the first direction of the bipolar electrode. The first image is generated by imaging the bipolar electrode in the first imaging range including the first edge extending along the same, and the second imaging range including the second edge facing the first edge of the bipolar electrode in the first direction. It is provided with an imaging step of generating a second image by imaging a bipolar electrode with, and a calculation step of calculating the distance between the first edge and the second edge based on the first image and the second image. .. In the mounting step, the bipolar electrode is mounted on the mounting surface with one edge of the bipolar electrode in contact with the first regulating member provided on the mounting surface and regulating the mounting position of the bipolar electrode. To.

In this measurement method, the bipolar electrode is mounted on the mounting surface in a state where the mounting position is restricted by the contact of any edge of the bipolar electrode with the first regulating member provided on the mounting surface of the measuring table. The bipolar electrode is imaged. Further, the distance between the first edge and the second edge of the bipolar electrode is calculated based on the first image and the second image generated by imaging the bipolar electrode. The bipolar electrode is in contact with the first regulating member and is placed stationary on the mounting surface of the measuring table, and the bipolar electrode is imaged in the stationary state. Therefore, the possibility that the end portion of the bipolar electrode floats upward is reduced. As a result, it is possible to improve the measurement accuracy of the length of the bipolar electrode.

According to the present invention, it is possible to improve the measurement accuracy of the length of the bipolar electrode.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device including a power storage module. FIG. 2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. FIG. 3 is a plan view of the bipolar electrode shown in FIG. FIG. 4 is a plan view of the measuring device according to the embodiment. FIG. 5 is a side view of the measuring device of FIG. FIG. 6 is a process diagram showing a measurement method of the bipolar electrode. FIG. 7 is a diagram for explaining a method of calculating the length of the bipolar electrode. FIG. 8 is a cross-sectional view of the measuring device according to the modified example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted. The drawings show Cartesian coordinate systems as needed. For example, in the XYZ Cartesian coordinate system, the X-axis direction and the Y-axis direction are horizontal directions, and the Z-axis direction is the vertical direction.

An embodiment of the power storage device will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device including a power storage module. The power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality of (three in this embodiment) power storage modules 12, but may include a single power storage module 12. The power storage module 12 is, for example, a bipolar battery. The power storage module 12 is a secondary battery such as a nickel hydrogen secondary battery and a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery will be illustrated.

The plurality of power storage modules 12 may be laminated via a conductive plate 14 such as a metal plate. Seen from the stacking direction, the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Details of each power storage module 12 will be described later. The conductive plates 14 are also arranged on the outside of the power storage modules 12 located at both ends in the stacking direction (Z-axis direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage modules 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction. In the stacking direction, the positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and the negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive electrode terminal 24 may be integrated with the conductive plate 14 to which the positive electrode terminal 24 is connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to which the negative electrode terminal 26 is connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction intersecting the stacking direction (X-axis direction). The positive electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

The conductive plate 14 can also function as a heat radiating plate for releasing the heat generated in the power storage module 12. By allowing a refrigerant such as air to pass through the plurality of voids 14a provided inside the conductive plate 14, the heat from the power storage module 12 can be efficiently discharged to the outside. Each void 14a extends, for example, in a direction intersecting the stacking direction (Y-axis direction). The area of the conductive plate 14 is smaller than the area of the power storage module 12 when viewed from the stacking direction, but may be the same as or larger than the area of the power storage module 12. Further, the conductive plate 14 may cover the power storage module 12 when viewed from the stacking direction.

The power storage device 10 may include a restraint member 16 that restrains the alternately stacked power storage modules 12 and the conductive plates 14 in the stacking direction. The restraint member 16 includes a pair of restraint plates 16A and 16B and a connecting member (bolt 18 and nut 20) for connecting the restraint plates 16A and 16B to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16A and 16B and the conductive plate 14. Each of the restraint plates 16A and 16B is made of a metal such as iron. When viewed from the stacking direction, the restraint plates 16A and 16B and the insulating film 22 have, for example, a rectangular shape. The area of the insulating film 22 is larger than the area of the conductive plate 14 when viewed from the stacking direction, and the insulating film 22 may cover the conductive plate 14. Further, the area of the restraint plates 16A and 16B may be larger than the area of the power storage module 12 when viewed from the stacking direction, and the restraint plates 16A and 16B may cover the power storage module 12. When viewed from the stacking direction, an insertion hole H1 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, when viewed from the stacking direction, an insertion hole H2 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16B. When the restraint plates 16A and 16B have a rectangular shape when viewed from the stacking direction, the insertion holes H1 and the insertion holes H2 are located at the corners of the restraint plates 16A and 16B.

One restraint plate 16A is abutted against the conductive plate 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other restraint plate 16B has the insulating film 22 attached to the conductive plate 14 connected to the positive electrode terminal 24. It is struck through. The bolt 18 is passed through the insertion hole H1 and the insertion hole H2 from one restraint plate 16A toward the other restraint plate 16B, for example. A nut 20 is screwed into the tip of a bolt 18 protruding from the other restraint plate 16B. As a result, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

A power storage module constituting the power storage device will be described with reference to FIG. 2. FIG. 2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. The power storage module 12 shown in FIG. 2 includes a laminated body 30 in which a plurality of bipolar electrodes 32 are laminated. When viewed from the stacking direction of the bipolar electrodes 32, the laminated body 30 has, for example, a rectangular shape. A separator 40 may be arranged between adjacent bipolar electrodes 32.

Each bipolar electrode 32 includes an electrode plate 34, a positive electrode 36 provided on the surface 34c of the electrode plate 34, and a negative electrode 38 provided on the surface 34d of the electrode plate 34. In the laminated body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one of the bipolar electrodes 32 adjacent to each other in the stacking direction with the separator 40 interposed therebetween, and the negative electrode 38 of one bipolar electrode 32 has the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 that is adjacent to each other in the stacking direction.

In the stacking direction, an electrode plate 34 in which the negative electrode 38 is arranged on the inner side surface (lower surface in the drawing) is arranged at one end of the laminated body 30. The electrode plate 34 corresponds to the negative electrode side terminal electrode. In the stacking direction, an electrode plate 34 having a positive electrode 36 arranged on an inner side surface (upper surface in the drawing) is arranged at the other end of the laminated body 30. The electrode plate 34 corresponds to the positive electrode side terminal electrode. The negative electrode 38 of the negative electrode side terminal electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 via the separator 40. The positive electrode 36 of the positive electrode side terminal electrode faces the negative electrode 38 of the lowermost bipolar electrode 32 via the separator 40. The electrode plates 34 of these terminal electrodes are connected to adjacent conductive plates 14 (see FIG. 1).

The power storage module 12 extends in the stacking direction of the bipolar electrodes 32 and includes a tubular resin portion 50 that accommodates the laminated body 30. The resin portion 50 holds peripheral portions 34a of the plurality of electrode plates 34. The resin portion 50 is configured to surround the laminated body 30. The resin portion 50 has, for example, a rectangular shape when viewed from the stacking direction of the bipolar electrodes 32. That is, the resin portion 50 has, for example, a rectangular frame shape.

The resin portion 50 is provided on the outside of the first seal portion 52 that holds the peripheral edge portion 34a of the electrode plate 34 and the first seal portion 52 in the direction intersecting the stacking direction (X-axis direction and Y-axis direction). It has two seal portions 54.

The first sealing portion 52 constituting the inner wall of the resin portion 50 is provided over the entire circumference of the peripheral edge portion 34a of the electrode plate 34 in the plurality of bipolar electrodes 32 (that is, the laminated body 30). The first sealing portion 52 is welded to, for example, the peripheral edge portion 34a of the electrode plate 34, and seals the peripheral edge portion 34a thereof. That is, the first seal portion 52 is joined to the peripheral edge portion 34a of the electrode plate 34. The peripheral edge portion 34a of the electrode plate 34 of each bipolar electrode 32 is held by the first seal portion 52. The peripheral edge portions 34a of the electrode plates 34 arranged at both ends of the laminated body 30 are also held by the first seal portion 52. As a result, an internal space liquid-tightly partitioned by the electrode plates 34, 34 and the first seal portion 52 is formed between the electrode plates 34, 34 adjacent to each other in the stacking direction. An electrolytic solution (not shown) composed of an alkaline solution such as an aqueous solution of potassium hydroxide is housed in the internal space.

The second seal portion 54 constituting the outer wall of the resin portion 50 covers the outer peripheral surface 52a of the first seal portion 52 extending in the stacking direction of the bipolar electrode 32. The inner peripheral surface 54a of the second seal portion 54 is welded to, for example, the outer peripheral surface 52a of the first seal portion 52, and seals the outer peripheral surface 52a thereof. That is, the second seal portion 54 is joined to the outer peripheral surface 52a of the first seal portion 52. The welding surface (joining surface) of the second sealing portion 54 with respect to the first sealing portion 52 forms, for example, four rectangular planes.

The electrode plate 34 is a rectangular metal foil made of, for example, nickel. The peripheral edge portion 34a of the electrode plate 34 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated. In the uncoated area, the electrode plate 34 is exposed. The uncoated area is held by the first seal portion 52 constituting the inner wall of the resin portion 50. Examples of the positive electrode active material constituting the positive electrode 36 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. When viewed from the stacking direction, the formation region of the negative electrode 38 on the surface 34d of the electrode plate 34 may be one size larger than the formation region of the positive electrode 36 on the surface 34c of the electrode plate 34.

The separator 40 is formed, for example, in the form of a sheet. The separator 40 has, for example, a rectangular shape. Examples of the material for forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like, or a non-woven fabric. .. Further, the separator 40 may be reinforced with a vinylidene fluoride resin compound or the like.

The resin portion 50 (first seal portion 52 and second seal portion 54) is formed in a rectangular tubular shape by, for example, injection molding using an insulating resin. Examples of the resin material constituting the resin portion 50 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The bipolar electrode 32 will be further described with reference to FIG. FIG. 3 is a plan view of the bipolar electrode shown in FIG. As shown in FIG. 3, the bipolar electrode 32 is formed in a substantially rectangular shape in a plan view. In the bipolar electrode 32, the positive electrode 36 is formed in a substantially rectangular shape in a plan view.

The bipolar electrode 32 has an edge 32a (first edge) and an edge 32b (second edge) extending along the Y-axis direction (second direction) and an edge 32c (first edge) extending along the X-axis direction (first direction). It has 3 edges) and an edge 32d. The edge 32a and the edge 32b face each other in the X-axis direction, and the edge 32c and the edge 32d face each other in the Y-axis direction. The length L of the bipolar electrode 32 in the X-axis direction is the distance between the edge 32a and the edge 32b. The length of the bipolar electrode 32 in the Y-axis direction is the distance between the edge 32c and the edge 32d. The design value of the length L is, for example, about 450 mm, and the design value of the length of the bipolar electrode 32 in the Y-axis direction is, for example, about 250 mm. The edges 32a and 32b correspond to a pair of edges facing each other in the X-axis direction of the electrode plate 34. The edge 32c and the edge 32d correspond to a pair of edges facing each other in the Y-axis direction of the electrode plate 34.

The positive electrode 36 has an edge 36a (fourth edge) and an edge 36b extending along the Y-axis direction, and an edge 36c and an edge 36d extending along the X-axis direction. The edge 36a and the edge 36b face each other in the X-axis direction, and the edge 36c and the edge 36d face each other in the Y-axis direction. The edge 36a is located on the edge 32a side of the bipolar electrode 32, and the edge 36c is located on the edge 32c side of the bipolar electrode 32.

The end portion 33a of the bipolar electrode 32 in the X-axis direction includes a corner portion 33c and a corner portion 33d. The corner portion 33c is one end portion of the end portion 33a in the Y-axis direction, and includes a corner formed by the edge 32a and the edge 32c. The corner portion 33d is the other end portion of the end portion 33a in the Y-axis direction, and includes a corner formed by the edge 32a and the edge 32d. The end portion 33b opposite to the end portion 33a in the X-axis direction of the bipolar electrode 32 includes a corner portion 33e and a corner portion 33f. The corner portion 33e is one end portion of the end portion 33b in the Y-axis direction, and includes a corner formed by the edge 32b and the edge 32c. The corner portion 33f is the other end portion of the end portion 33b in the Y-axis direction, and includes a corner formed by the edge 32b and the edge 32d.

Next, the measuring device according to the embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a plan view of the measuring device according to the embodiment. FIG. 5 is a side view of the measuring device of FIG. 4 and 5 show a state in which a single bipolar electrode 32 is placed on the measuring device 60.

The measuring device 60 shown in FIGS. 4 and 5 is a device for measuring the length L of the bipolar electrode 32. That is, the measuring device 60 measures the distance (length L) between the edge 32a and the edge 32b in the bipolar electrode 32. The measuring device 60 includes a measuring table 62 having a mounting surface 62a, a regulating member 64 (first regulating member), a regulating member 66a, a regulating member 66b, a camera 68a (first imaging unit), and a camera 68b ( A second image pickup unit) and a control unit 70 are provided.

The measuring table 62 is a table on which the bipolar electrode 32 is placed. The measuring table 62 supports the mounted bipolar electrode 32. The measuring table 62 has a mounting surface 62a at the upper end of the measuring table 62. The mounting surface 62a extends along a plane (horizontal plane) orthogonal to the direction D3, and has, for example, a rectangular shape in a plan view. The mounting surface 62a is provided with a regulating member 64, a regulating member 66a, and a regulating member 66b.

The regulating member 64 is a member that regulates the mounting position of the bipolar electrode 32. The regulating member 64 is arranged at one end of the mounting surface 62a in the direction D2. The regulating member 64 extends along the direction D1 and has a substantially rectangular parallelepiped shape. When the bipolar electrode 32 comes into contact with the regulating member 64, the mounting position of the bipolar electrode 32 is restricted. The regulating member 64 has a contact surface 64a extending along a plane orthogonal to the direction D2. That is, the contact surface 64a is orthogonal to the mounting surface 62a. The contact surface 64a is one side surface of the regulating member 64 facing the center of the measuring table 62 in a plan view. The mounting position of the bipolar electrode 32 in the direction D2 is restricted by the contact of the edge 32c of the bipolar electrode 32 with the contact surface 64a.

The regulating member 66a and the regulating member 66b (a pair of second regulating members) are members that regulate the mounting position of the bipolar electrode 32. The regulating member 66a and the regulating member 66b are arranged apart from each other along the direction D1. Specifically, the regulating member 66a is arranged at one end of the mounting surface 62a in the direction D1, and the regulating member 66b is arranged at the other end of the mounting surface 62a in the direction D1. The regulating member 66a extends along the direction D2 and has a substantially rectangular parallelepiped shape. The regulating member 66b extends along the direction D2 and has a substantially rectangular parallelepiped shape. As described above, the regulating member 66a and the regulating member 66b extend in a direction orthogonal to the contact surface 64a. The separation distance between the regulation member 66a and the regulation member 66b is larger than the design value of the length L. By arranging the bipolar electrode 32 between the regulating member 66a and the regulating member 66b, the mounting position of the bipolar electrode 32 in the direction D1 is restricted.

The camera 68a and the camera 68b are devices for capturing an image of an object to be measured. Each of the camera 68a and the camera 68b images a part of the bipolar electrode 32 mounted on the mounting surface 62a. Each of the camera 68a and the camera 68b is, for example, a digital camera capable of generating an image having a predetermined number of pixels. The camera 68a and the camera 68b are provided above the measuring table 62 (mounting surface 62a), and are fixed to the measuring table 62 by, for example, a fixing member extending from the side surface of the measuring table 62. The camera 68a and the camera 68b are fixed to the measuring table 62 with the lenses of the camera 68a and the camera 68b facing the mounting surface 62a. The camera 68a and the camera 68b are provided, for example, at substantially the same height as each other. The camera 68a and the camera 68b are arranged apart from each other in the direction D1.

The camera 68a generates a first image by imaging the end 33a of the bipolar electrode 32 in the imaging range R1 (first imaging range). Here, the imaging range R1 is set so that the corner portion 33c of the bipolar electrode 32 mounted on the mounting surface 62a is included in the imaging range R1. By setting the imaging range R1 in this way, the imaging range R1 includes a part of the edge 32a. Here, the imaging range R1 is set so that the imaging range R1 includes a part of the edge 36a and the edge 36c of the positive electrode 36. The camera 68a outputs the generated first image to the control unit 70.

The camera 68b generates a second image by imaging the end 33b of the bipolar electrode 32 in the imaging range R2 (second imaging range). Here, the imaging range R2 is set so that the corner portion 33e of the bipolar electrode 32 mounted on the mounting surface 62a is included in the imaging range R2. By setting the imaging range R2 in this way, the imaging range R2 includes a part of the edge 32b. Here, the imaging range R2 is set so that the imaging range R2 includes a part of the edge 36b and the edge 36c of the positive electrode 36. The camera 68b outputs the generated second image to the control unit 70.

Each of the imaging range R1 and the imaging range R2 is set to a substantially rectangular range having a pair of sides extending along the direction D1 and a pair of sides extending along the direction D2. For example, each of the imaging range R1 and the imaging range R2 is a substantially square range in which the length of each side is about 50 mm. For example, the imaging range R1 and the imaging range R2 are set to desired ranges by adjusting the height or focal length of the cameras 68a and 68b from the mounting surface 62a.

The pair of sides along the direction D1 in each of the imaging range R1 and the imaging range R2 is substantially parallel to the direction in which the contact surface 64a of the regulating member 64 extends in plan view. One of the pair of sides along the direction D1 in the imaging range R1 and the imaging range R2, which is farther from the center of the measuring table 62 in the plan view, is measured in the plan view rather than the contact surface 64a in the direction D2, for example. It is located away from the center of the platform 62. The image pickup range R1 and the image pickup range R2 are located between the regulation member 66a and the regulation member 66b in the direction D1. For example, the distance between the side of the imaging range R1 and the side of the imaging range R2, which have the largest separation distance from each other in the direction D1, is substantially equal to the separation distance between the regulation member 66a and the regulation member 66b.

The first image is generated in a shape similar to the imaging range R1, and the second image is generated in a shape similar to the imaging range R2. Each of the first image and the second image has a plurality of pixels arranged in the horizontal direction corresponding to the direction D1 and in the vertical direction corresponding to the direction D2. Each of the first image and the second image has, for example, about 2 million pixels.

The control unit 70 is a computer that performs predetermined control. The control unit 70 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input / output interface, software for performing image processing, and the like. The control unit 70 is communicably connected to each of the camera 68a and the camera 68b. The control unit 70 instructs the camera 68a and the camera 68b to take an image. The control unit 70 acquires the first image and the second image generated by the camera 68a and the camera 68b, respectively. Further, the control unit 70 calculates the length L of the bipolar electrode 32 based on the first image and the second image. The control unit 70 may have a display or the like that displays a measurement result based on the calculated result. Further, the control unit 70 may have an input device that receives an instruction from a worker. The details of the calculation method performed by the control unit 70 will be described later.

Next, with reference to FIGS. 6 and 7, a method for measuring the bipolar electrode 32 performed using the measuring device 60 of the embodiment will be described. FIG. 6 is a process diagram showing a measurement method of the bipolar electrode. FIG. 7 is a diagram for explaining a method of calculating the length of the bipolar electrode.

For example, the inspection step, which is a part of the manufacturing process of the bipolar electrode 32, includes the measurement of the length L of the bipolar electrode 32. In the manufacturing process of the plurality of bipolar electrodes 32, for example, an electrode base material is produced by applying an active material over a plurality of regions having predetermined intervals in the longitudinal direction on both sides of a conductive sheet extending in the longitudinal direction. The electrode base material is an electrode material that is the basis of the bipolar electrode 32, and is wound around a supply roll. Then, the electrode base material is unwound from the supply roll, the electrode base material is conveyed by the conveying means, and the electrode base material is cut to generate the bipolar electrode 32. Then, using the above-mentioned measuring device 60, the length L of each bipolar electrode 32 formed by cutting the electrode base material is measured.

As shown in FIG. 6, in the measurement method of the bipolar electrode 32, a preparation step (step S01) is first performed. In the preparatory step, the distance between the camera 68a and the camera 68b is calibrated. The distance is calibrated on the software while the fixed positions of the cameras 68a and 68b are maintained. Specifically, the imaging range R1 includes the reference line F1, and the imaging range R2 includes the reference line F2. The reference line F1 is a virtual line corresponding to a reference pixel position in the first image, and corresponds to, for example, a pixel row located substantially in the center of the horizontal direction in the first image and extending vertically in the vertical direction. That is, the reference line F1 is located substantially in the center of the direction D1 in the imaging range R1 and extends along the direction D2. The reference line F2 is a virtual line corresponding to a reference pixel position in the second image, and corresponds to, for example, a pixel row located substantially in the center of the horizontal direction in the second image and extending vertically in the vertical direction. That is, the reference line F2 is located substantially in the center of the direction D1 in the imaging range R2 and extends along the direction D2.

Subsequently, the bipolar electrode 32 having a length Lk is placed on the measuring table 62. The length Lk is pre-measured by another measuring means. That is, the length Lk is a known value. Then, each of the camera 68a and the camera 68b generates a first image and a second image by imaging the end 33a and the end 33b of the bipolar electrode 32 placed on the measuring table 62. The control unit 70 calculates the distance L1 between the edge 32a and the reference line F1 based on the first image, and calculates the distance L2 between the edge 32b and the reference line F2 based on the second image.

When the edge 32a is farther from the imaging range R2 than the reference line F1 in the imaging range R1, the distance L1 is a positive value. On the contrary, when the edge 32a is closer to the imaging range R2 than the reference line F1 in the imaging range R1, the distance L1 is a negative value. When the edge 32b is farther from the imaging range R1 than the reference line F2 in the imaging range R2, the distance L2 is a positive value. When the edge 32b is closer to the imaging range R1 than the reference line F2 in the imaging range R2, the distance L2 is a negative value.

In the calculation of the distance L1, the control unit 70 detects the edge 32a in the first image and acquires the number of pixels P1 in the lateral direction located between the edge 32a in the first image and the reference line F1. The control unit 70 calculates the distance L1 by multiplying the number of pixels P1 by the converted distance Lc1 per pixel. The converted distance Lc1 is a ratio in which one pixel in the first image is associated with the actual distance in the imaging range R1, and the converted distance Lc1 is stored in advance in the control unit 70. The conversion distance Lc1 is, for example, several tens of μm.

In the calculation of the distance L2, the control unit 70 detects the edge 32b in the second image and acquires the number of pixels P2 in the lateral direction located between the edge 32b and the reference line F2 in the second image. The control unit 70 calculates the distance L2 by multiplying the number of pixels P2 by the converted distance Lc2 per pixel. The converted distance Lc2 is a ratio in which one pixel in the second image is associated with the actual distance in the imaging range R2, and the converted distance Lc2 is stored in advance in the control unit 70. The converted distance Lc2 is, for example, the same value as the converted distance Lc1.

When the edge 32a is tilted with respect to the reference line F1 in the first image, the number of pixels between the edge 32a and the reference line F1 may differ depending on the pixel position in the vertical direction of the first image. In this case, the control unit 70 may calculate, for example, the average value of the number of pixels between the edge 32a and the reference line F1 at each pixel position in the vertical direction as the number of pixels P1. Similarly, in the second image, the control unit 70 may calculate the average value of the number of pixels between the edge 32b and the reference line F2 according to each pixel position in the vertical direction as the number of pixels P2.

The length Lk of the bipolar electrode 32 used in the preparatory step is the sum of the distance L1 and the distance L2, and the distance Ls between the reference line F1 and the reference line F2, as shown in the equation (1). The value. Since the length Lk is known, the control unit 70 calculates the distance Ls by subtracting the distance L1 and the distance L2 from the length Lk as shown in the equation (2). Then, the control unit 70 stores the calculated value of the distance Ls as a calibration value. This completes the calibration of the distance between the camera 68a and the camera 68b. In addition, instead of the bipolar electrode 32 having a known length Lk, a plate-shaped member for calibration having a known length Lk may be used. In the step after the preparation step, the length L of the other bipolar electrode 32 is measured with the distance Ls set to the above calibration value.
Lk = L1 + Ls + L2… (1)
Ls = Lk-L1-L2… (2)

Subsequently, a mounting step (step S02) of mounting the bipolar electrode 32 having an unknown length L on the mounting surface 62a is performed. The bipolar electrode 32 is mounted on the mounting surface 62a by, for example, a worker or a robot arm. The bipolar electrode 32 is placed on the mounting surface 62a with the positive electrode 36 (second active material layer) provided on the surface 34c (second surface) of the electrode plate 34 facing upward and the negative electrode 38 facing downward. Placed. Further, the bipolar electrode 32 is placed on the mounting surface 62a with the edges 32a and 32b along the direction D2 and the edges 32c and 32d along the direction D1. At this time, the bipolar electrode 32 is placed on the mounting surface 62a in a state where the bipolar electrode 32 is inserted between the regulating member 66a and the regulating member 66b and the edge 32c is in contact with the contact surface 64a of the regulating member 64. Placed. That is, the bipolar electrode 32 is arranged between the regulating member 66a and the regulating member 66b, is placed on the mounting surface 62a in a state of being in contact with the contact surface 64a, and is stationary. In the state where the bipolar electrode 32 is mounted, the negative electrode 38 (first active material layer) provided on the surface 34d (first surface) of the electrode plate 34 comes into contact with the mounting surface 62a.

Subsequently, an imaging step (step S03) of imaging the bipolar electrode 32 is performed. Since the bipolar electrode 32 is mounted in a state where the mounting position is restricted by the regulating member 64, the regulating member 66a, and the regulating member 66b, the imaging range R1 includes the corner portion 33c. Further, the imaging range R2 includes the corner portion 33e. The camera 68a generates a first image by imaging the bipolar electrode 32 in the imaging range R1. The camera 68b generates a second image by imaging the bipolar electrode 32 in the imaging range R2. The camera 68a and the camera 68b may be imaged by, for example, an operator inputting an imaging instruction to the control unit 70, and automatically after detecting that the bipolar electrode 32 is mounted by a sensor or the like. It may be done as a target. Further, the image pickup by the camera 68a and the image pickup by the camera 68b may be performed at the same time, or may be performed at different timings from each other.

Subsequently, a calculation step (step S04) for calculating the length L of the bipolar electrode 32 is performed. First, the control unit 70 acquires the first image and the second image generated in step S03. Then, the control unit 70 calculates the distance L1 and the distance L2, and calculates the length L based on the distance L1, the distance L2, and the distance Ls. Specifically, the control unit 70 calculates the distance L1 based on the number of pixels P1 in the lateral direction located between the edge 32a and the reference line F1 in the first image. The control unit 70 calculates the distance L2 based on the number of pixels P2 in the lateral direction located between the edge 32b and the reference line F2 in the second image. The calculation of the distance L1 and the distance L2 is performed in the same manner as in step S01.

Since the distance Ls is set to a known value (calibration value) in step S01, the control unit 70 adds up the distance L1, the distance L2, and the distance Ls as shown in the equation (3). , The length L is calculated.
L = L1 + Ls + L2… (3)

In step S04, in addition to the measurement of the length L, the control unit 70 may perform other measurements. The control unit 70 calculates the angle θ1 at the corner portion 33c and also calculates the angle θ2 at the corner portion 33e. The angle θ1 is the angle formed by the edge 32a and the edge 32c, and the angle θ2 is the angle formed by the edge 32b and the edge 32c. Specifically, the control unit 70 calculates the angle θ1 by calculating the angle formed by the edge 32a and the edge 32c in the first image. The control unit 70 calculates the angle θ2 by calculating the angle formed by the edge 32b and the edge 32c in the second image.

Further, in step S04, the control unit 70 calculates the distances L3 to L5 between the edges 32a to 32c of the bipolar electrodes 32 adjacent to each other and the edges 36a to 36c of the positive electrode 36. Specifically, the control unit 70 calculates the distance L3 between the edge 32a and the edge 36a based on the number of pixels in the lateral direction located between the edge 32a and the edge 36a in the first image. The control unit 70 calculates the distance L4 between the edge 32c and the edge 36c based on the number of pixels in the vertical direction located between the edge 32c and the edge 36c in the first image.

The control unit 70 calculates the distance L5 between the edge 32b and the edge 36b based on the number of pixels in the lateral direction located between the edge 32b and the edge 36b in the second image. The control unit 70 calculates the distance L4 between the edge 32c and the edge 36c based on the number of pixels in the vertical direction located between the edge 32c and the edge 36c in the second image instead of the first image. You may. The calculation of the distances L3 to L5 is performed in the same manner as the calculation of the distances L1 and L2.

Various determination threshold values are stored in advance in the control unit 70, and in step S04, the control unit 70 compares various lengths (distances) or angles of the measured bipolar electrodes 32 with the determination threshold values to measure the bipolar. It may be determined whether or not the electrode 32 is a nonconforming product. The control unit 70 may have a notification means for notifying the worker of the determination result of the bipolar electrode 32. For example, the control unit 70 may have a display for displaying a determination result of whether or not the bipolar electrode 32 to be measured is a nonconforming product.

This completes the measurement of the single bipolar electrode 32. Subsequently, by repeating the steps from step S02 to step S04, the measurement of the other plurality of bipolar electrodes 32 is performed. Before and after the measurement of each bipolar electrode 32, another inspection such as a visual inspection by an operator may be performed on the bipolar electrode 32 mounted on the mounting surface 62a.

After the measurement of the bipolar electrode 32, for example, in the next step, a frame is bonded to the peripheral edge portion 34a of the bipolar electrode 32, and a plurality of bipolar electrodes 32 to which the frame is bonded are laminated, as shown in FIG. The laminated body 30 is obtained. The first seal portion 52 is formed by stacking a plurality of frames. Then, the second seal portion 54 is formed by, for example, injection molding. Subsequently, the electrolytic solution is injected into the resin portion 50 to manufacture the power storage module 12.

As described above, in the measuring device 60, the length L of the bipolar electrode 32 is measured based on the first image and the second image generated by the camera 68a and the camera 68b. A method of measuring the length L of the bipolar electrode 32 using a caliper or the like can be considered, but in this case, the caliper or the like may come into contact with the bipolar electrode 32 at the time of measurement and damage the bipolar electrode 32. On the other hand, in the above-mentioned measuring device 60, the camera 68a and the camera 68b image the bipolar electrode 32 in a non-contact state with the bipolar electrode 32. Therefore, it is possible to reduce the possibility that the bipolar electrode 32 is damaged.

The length L is measured by taking an image of the end portion 33a and the end portion 33b by the camera 68a and the camera 68b. Therefore, when the entire surface of the bipolar electrode 32 is imaged by one camera, the length L of the bipolar electrode 32 is measured, which is necessary for obtaining the image necessary for the measurement as compared with the case where the length L of the bipolar electrode 32 is measured. It is possible to reduce the number of pixels. This makes it possible to measure the bipolar electrode 32 with a camera having a small number of pixels.

At the time of manufacturing (assembling) the measuring device 60, the camera 68a and the camera 68b are fixed to the measuring table 62 so that the distance between them substantially matches the length L of the bipolar electrode 32. That is, at this stage, the distance between the camera 68a and the camera 68b is an unknown value. Then, in the preparation step, the distance Ls between the camera 68a (reference line F1) and the camera 68b (reference line F2) is calculated on the software without changing the fixed positions of the camera 68a and the camera 68b. .. Then, the length L of the bipolar electrode 32 is measured by using the calculated value of the distance Ls. This makes it possible to measure the bipolar electrode 32 without accurately adjusting the physical distance between the camera 68a and the camera 68b.

When the measurement of the bipolar electrode 32 is performed while transporting the bipolar electrode 32, for example, when the bipolar electrode 32 is mounted on the mounting surface of the transporting means so that the mounting surface of the transporting means and the negative electrode 38 come into contact with each other, A gap is formed between the peripheral edge portion 34a of the electrode plate 34 and the mounting surface of the transport means. Therefore, as the bipolar electrode 32 moves, any end of the bipolar electrode 32 may float upward. If the end 33a and the end 33b are imaged with any end of the bipolar electrode 32 floating upward, the length L may not be measured correctly.

On the other hand, in the above-mentioned measuring device 60, the mounting position is restricted by the edge 32c of the bipolar electrode 32 coming into contact with the regulating member 64 provided on the mounting surface 62a on the mounting surface 62a. The end 33a and the end 33b of the mounted bipolar electrode 32 are imaged. The bipolar electrode 32 is in contact with the regulating member 64 and is mounted on the mounting surface 62a in a stationary state, and the end portions 33a and the end portions 33b are imaged in the stationary state. Therefore, the possibility that the end portion included in the bipolar electrode 32 floats upward is reduced. As a result, it is possible to improve the measurement accuracy of the length L of the bipolar electrode 32.

The mounting position of the bipolar electrode 32 is restricted by the edge 32c of the bipolar electrode 32 coming into contact with the contact surface 64a. Since the bipolar electrode 32 is mounted on the mounting surface 62a so that the edge 32c is along the contact surface 64a, the mounting position of the bipolar electrode 32 in the direction D2 is restricted, and the inclination of the bipolar electrode 32 in a plan view is restricted. Is regulated. Further, the imaging range R1 and the imaging range R2 are set so that the direction in which the contact surface 64a extends in a plan view and the pair of sides along the directions D1 of the imaging range R1 and the imaging range R2 are substantially parallel to each other. .. As a result, the edge 32a is substantially parallel to the reference line F1 in the first image, and the edge 32b is substantially parallel to the reference line F2 in the second image. Therefore, the distance L1 and the distance L2 can be calculated without considering the inclination of the edge 32a with respect to the reference line F1 and the inclination of the edge 32b with respect to the reference line F2. As a result, the bipolar electrode 32 can be arranged at a mounting position where the length L of the bipolar electrode 32 can be easily measured.

In the direction D1, the image pickup range R1 and the image pickup range R2 are located between the regulation member 66a and the regulation member 66b. Therefore, by mounting the bipolar electrode 32 between the regulating member 66a and the regulating member 66b, the mounting position of the bipolar electrode 32 in the direction D1 is restricted. As a result, if the bipolar electrode 32 is arranged between the regulating member 66a and the regulating member 66b, the position of the bipolar electrode 32 in the direction D1 is not adjusted so that the bipolar electrode 32 is included in the imaging ranges R1 and R2. The bipolar electrode 32 is included in the imaging ranges R1 and R2. As a result, the bipolar electrode 32 can be easily arranged at a measurable mounting position.

The angle θ1 formed by the edge 32a and the edge 32c is calculated based on the first image, and the angle θ2 formed by the edge 32b and the edge 32c is calculated based on the second image. Therefore, it is possible to determine whether or not the bipolar electrode 32 is formed in a rectangular shape by determining whether or not the calculation results of the angles θ1 and θ2 are substantially equal to the right angle. That is, it is possible to determine that the bipolar electrode 32 formed in a parallel quadrilateral shape or a trapezoidal shape is a nonconforming product.

The distance L3 between the edge 32a and the edge 36a is measured based on the first image, the distance L5 between the edge 32b and the edge 36b is calculated based on the second image, and the distance L5 between the first image and the second image is calculated. The distance L4 between the edge 32c and the edge 36c is calculated based on at least one of them. By using the calculation results of these distances L3 to L5, it is possible to determine whether or not the positive electrode 36 is formed at a desired position with respect to the electrode plate 34.

Although one embodiment of the present invention has been described, the present invention is not limited to the above embodiment.

FIG. 8 is a cross-sectional view of the measuring device according to the modified example. The measuring device 60A according to the modified example is different from the measuring device 60 in that the pressing member 72 is further provided. The pressing member 72 is, for example, a plate-shaped transparent member. The presser member 72 is, for example, a transparent acrylic plate. The pressing member 72 is arranged above the bipolar electrode 32 mounted on the mounting surface 62a, and has a size (area) that covers, for example, the entire surface of the bipolar electrode 32 in a plan view. The pressing member 72 has a contact surface 72a, and the contact surface 72a is in contact with the positive electrode 36 of the bipolar electrode 32. As a result, the pressing member 72 presses the bipolar electrode 32 toward the mounting surface 62a. In the mounting step, after the bipolar electrode 32 is mounted on the mounting surface 62a, the holding member 72 is placed on the bipolar electrode 32. The pressing member 72 is arranged on the bipolar electrode 32, for example, with one end of the pressing member 72 in contact with the regulating member 64. After that, in the imaging step, imaging is performed by the cameras 68a and 68b. The size (area) of the holding member 72 in a plan view may be smaller than that of the bipolar electrode 32. The presser member 72 may have a contact surface 72a extending along the direction D1 in a state where one end of the presser member 72 is arranged on the bipolar electrode 32 so as to abut on the restricting member 64.

In the measuring device 60A, the bipolar electrode 32 is pressed toward the mounting surface 62a in a state of being sandwiched between the mounting surface 62a and the contact surface 72a. Therefore, even if the end portion included in the bipolar electrode 32 tries to float upward, the movement of the bipolar electrode 32 (electrode plate 34) is suppressed by the pressing member 72 (contact surface 72a). As a result, it is possible to further suppress the end portion of the bipolar electrode 32 from floating upward, so that the measurement accuracy of the length L of the bipolar electrode 32 can be further improved.

The measurement of the bipolar electrode 32 is performed with the bipolar electrode 32 mounted on the mounting surface 62a so that the negative electrode 38 (second active material layer) provided on the surface 34d (second surface) faces upward. You may. In this case, the positive electrode 36 (first active material layer) provided on the surface 34c (first surface) comes into contact with the mounting surface 62a. Further, the distance between each edge of the bipolar electrodes 32 adjacent to each other and each edge of the negative electrode 38 may be measured.

The imaging range R1 includes the corner portion 33c, and the imaging range R2 includes the corner portion 33e, but the setting of the imaging ranges R1 and R2 is not limited to this. The imaging range R1 may be set to include any of the end portions 33a as long as it includes the edge 32a. The imaging range R2 may be set to include any part of the end 33b as long as it includes the edge 32b.

The imaging range R1 and the imaging range R2 may be in the same size range as each other, or may be in different sizes from each other. The imaging range R1 and the imaging range R2 may be located at different positions in the direction D2.

The length L may be measured with the edge 32d of the bipolar electrode 32 in contact with the contact surface 64a.

The measuring devices 60 and 60A may measure the length of the bipolar electrode 32 in the Y-axis direction. Specifically, the measuring devices 60 and 60A may measure the distance between the edge 32c and the edge 32d. In this case, the measurement of the bipolar electrode 32 may be performed with either the edge 32a or the edge 32b in contact with the contact surface 64a.

The measuring devices 60 and 60A may further include another camera in addition to the camera 68a and the camera 68b. For example, in the measuring devices 60 and 60A, a camera set so as to include the corner portion 33d in the imaging range may be provided, and a camera set so as to include the corner portion 33f in the imaging range may be provided. May be good. In this case, the distance between the edge 32c and the edge 32d may be measured along with the length L. Further, the distance between the edge 32d and the edge 36d may be measured. In this case, by using the calculation result of the distances L3 to L5 together with the calculation result of the distance between the edge 32d and the edge 36d, it is determined whether or not the positive electrode 36 is formed in a desired range with respect to the electrode plate 34. It becomes possible to do.

The regulating member 64 may be provided at the other end of the mounting surface 62a in the direction D2, which is opposite to the one where the camera 68a and the camera 68b are located. The regulating member 64 is provided on either end of the mounting surface 62a in the direction D1, and the regulating member 66a and the regulating member 66b are designed to have the length of the bipolar electrode 32 in the Y-axis direction in the direction D2. They may be spaced apart with a value spacing.

The measuring device 60 may not include the regulating member 66a and the regulating member 66b. In this case, the regulating member 64 may be provided at any end of the mounting surface 62a. Further, in addition to the regulating member 64, the measuring device 60 may be provided with another regulating member having a contact surface extending in a direction orthogonal to the contact surface 64a at an end adjacent to the regulating member 64. Adjacent edges (for example, edges 32a and edges 32c) of the bipolar electrode 32 abut on the regulating member 64 and another regulating member, respectively, whereby the mounting position of the bipolar electrode 32 in the direction D1 and the direction D2 is restricted. You may.

The regulating member 64 does not have to have a rectangular parallelepiped shape, and may be a member having a contact surface 64a or a contact portion. The regulating member 66a and the regulating member 66b do not have to be rectangular parallelepiped, and may be a pair of members provided apart from each other in the direction D1. The regulating member 66a and the regulating member 66b may have different shapes from each other.

32 ... Bipolar electrode, 32a to 32d ... Edge, 34 ... Electrode plate, 36 ... Positive electrode, 38 ... Negative electrode, 60, 60A ... Measuring device, 62 ... Measuring table, 62a ... Mounting surface, 64 ... Regulatory member, 64a ... Contact surface, 66a, 66b ... Regulatory member, 68a, 68b ... Camera, 70 ... Control unit, 72 ... Presser member, R1, R2 ... Imaging range.

Claims (7)

It has an electrode plate, a first active material layer provided on the first surface of the electrode plate, and a second active material layer provided on a second surface opposite to the first surface of the electrode plate. A measuring device that measures the length of a bipolar electrode in the first direction.
A measuring table having a mounting surface on which the bipolar electrode is mounted so that the first active material layer is in contact with the measuring table.
A first regulating member provided on the above-mentioned mounting surface and restricting the mounting position of the bipolar electrode by contacting any edge of the bipolar electrode.
A first imaging unit that generates a first image by imaging the bipolar electrode in a first imaging range including a first edge extending along a second direction intersecting the first direction of the bipolar electrode.
A second imaging unit that generates a second image by imaging the bipolar electrode in a second imaging range including a second edge facing the first edge of the bipolar electrode in the first direction.
A control unit for calculating the distance between the first edge and the second edge based on the first image and the second image is provided.
Measuring device. The first regulatory member has a contact surface that intersects the above-mentioned mounting surface.
The measuring device according to claim 1. Further provided with a pair of second regulatory members provided on the above-mentioned mounting surface and extending in a direction intersecting the contact surface.
The separation distance between the pair of second regulating members is larger than the design value of the length of the bipolar electrode in the first direction.
The measuring device according to claim 2. A pressing member having a contact surface in contact with the second active material layer and pressing the bipolar electrode toward the above-mentioned mounting surface is further provided.
The measuring device according to any one of claims 1 to 3. The first imaging range includes a third edge extending along the first direction of the bipolar electrode.
The control unit calculates the angle formed by the first edge and the third edge based on the first image.
The measuring device according to any one of claims 1 to 4. The first imaging range includes a fourth edge extending along the second direction of the second active material layer.
The control unit calculates the distance between the first edge and the fourth edge based on the first image.
The measuring device according to any one of claims 1 to 5. It has an electrode plate, a first active material layer provided on the first surface of the electrode plate, and a second active material layer provided on a second surface opposite to the first surface of the electrode plate. It is a measurement method for measuring the length of a bipolar electrode in the first direction.
A mounting step of mounting the bipolar electrode on the mounting surface described above so that the first active material layer is in contact with the mounting surface of the measuring table.
A first image is generated by imaging the bipolar electrode in a first imaging range including a first edge extending along a second direction intersecting the first direction of the bipolar electrode, and the first image of the bipolar electrode. An imaging step of generating a second image by imaging the bipolar electrode in a second imaging range including a second edge facing the first edge in the first direction.
A calculation step of calculating the distance between the first edge and the second edge based on the first image and the second image is provided.
In the pre-described step, the bipolar electrode is described above in a state where any edge of the bipolar electrode is in contact with a first regulating member provided on the pre-described mounting surface and regulating the mounting position of the bipolar electrode. Placed on the surface,
Measurement method.

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