Secondary battery electrode thickness measuring device and secondary battery electrode thickness measuring method using same

Abstract

The present invention provides a secondary battery electrode thickness measuring device comprising: a fixed side base member; a lower base member coupled to the side base member; a plurality of electrode transfer rollers which is supported by the side base member, supports an electrode, and transfers the electrode in one direction; a sensor unit for measuring the thickness of the electrode positioned in a space between two electrode transfer rollers among the plurality of electrode transfer rollers; a moving unit capable of moving the sensor unit; and a correction unit for performing zero correction on the sensor unit.

Description

Secondary battery electrode thickness measuring device and secondary battery electrode thickness measuring method using the same

[0001] The present invention relates to a secondary battery electrode thickness measuring device and a secondary battery electrode thickness measuring method using the same. More specifically, the invention relates to a secondary battery electrode thickness measuring device capable of measuring the thickness of an electrode and reducing measurement errors by performing zero-point correction of a sensor part, and a secondary battery electrode thickness measuring method using the same. The present application claims the benefit of priority based on Korean Patent Application No. 10-2024-0194385 dated December 23, 2024, and all contents disclosed in the document of said Korean patent application are incorporated as part of this specification.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The manufacturing of a secondary battery includes an electrode process comprising mixing, coating, roll pressing, slitting, and notching processes; an assembly process for embedding the electrode assembly into a case; and an activation process for electrically activating and stabilizing the battery cells. After the activation process, the battery cells can be stacked to form a cell stack. The cell stack can be mounted in a housing together with a module frame, or directly mounted in a housing without a module frame.

[0004] Unit cells of secondary batteries are classified into cylindrical, prismatic, and pouch types depending on the type of case. In the case of a cylindrical battery, the positive and negative electrodes, which are electrodes coated with active material, are transported in a plate form, and a separator, which is an insulator, is interposed between the positive and negative electrodes coated with active material. A winding process is then performed to wind the plates to form a jelly roll-shaped electrode assembly, and the jelly roll-shaped electrode assembly is inserted into a battery can to form a battery.

[0005] In the above winding process, the space between the anode, cathode, and separator is narrow, so there is a problem that thickness measurement is impossible with a conventional secondary battery electrode thickness measuring device, and there is a problem that the zero point of the thickness measuring sensor changes due to vibration in the winding process, causing the error in measuring the thickness of the secondary battery electrode to increase.

[0006] Accordingly, to solve the aforementioned problems, there is a need for technology regarding a secondary battery electrode thickness measuring device that can be used in the winding process and allows for zero point adjustment during the winding process, and a secondary battery electrode thickness measuring method using the same.

[0007] The first technical objective of the present invention is to provide a secondary battery electrode thickness measuring device that can be used in a winding process and allows for zero-point adjustment during the winding process.

[0008] The second technical objective of the present invention is to provide a method for measuring the thickness of a secondary battery electrode that can be used in a winding process and allows for zero-point adjustment during the winding process.

[0009] To achieve the first technical objective, the present invention provides a secondary battery electrode thickness measuring device comprising: a fixed side base member; a lower base member coupled to the side base member; a plurality of electrode transfer rollers supported by the side base member, supporting an electrode, and transferring the electrode in one direction; a sensor unit for measuring the thickness of an electrode located in the space between two of the plurality of electrode transfer rollers; a moving unit capable of moving the sensor unit; and a correction unit for zero-point correction of the sensor unit.

[0010]

[0011] In some embodiments, the sensor unit may include an upper sensor for measuring the upper part of the electrode; and a lower sensor for measuring the lower part of the electrode, positioned at a location corresponding to the upper sensor.

[0012] In some embodiments, the moving part may move the sensor part to the correction part when the transfer of the electrode by the plurality of electrode transfer rollers is stopped.

[0013] In some embodiments, the moving part can return the moved sensor part to its previous position when the transfer of the electrode by the plurality of electrode transfer rollers is resumed.

[0014] In some embodiments, the moving member may include a moving support member supported by the lower base member and coupled to the lower base member; and a moving member capable of moving on the moving support member.

[0015] In some embodiments, the sensor part comprises: an upper sensor holding part for holding the upper sensor; a lower sensor holding part for holding the lower sensor; and a sensor holding part coupling member for coupling the upper sensor holding part and the lower sensor holding part; and the sensor holding part coupling member may be coupled to the moving member.

[0016] In some embodiments,

[0017] The above moving part may further include a fine adjustment part capable of changing the position of one of the upper sensor and the lower sensor on a plane so that the upper sensor and the lower sensor correspond.

[0018]

[0019] In some embodiments, the sensor part comprises: an upper sensor holding part for holding the upper sensor; a lower sensor holding part for holding the lower sensor; and a sensor holding part coupling member for coupling the upper sensor holding part and the lower sensor holding part; and the sensor holding part coupling member may be coupled to the moving part and the fine adjustment part.

[0020] In some embodiments, the correction unit includes a correction block disposed between the upper sensor and the lower sensor when zero-point correcting the sensor unit; and a correction block support member supporting the correction block; and the actual thickness of the correction block can be input.

[0021] In some embodiments, the correction block may be spaced apart from and adjacent to the end portions of the plurality of electrode transfer rollers.

[0022] In some embodiments, the zero point correction may be to match the actual thickness of the correction block with the measured thickness of the correction block measured by the sensor unit.

[0023]

[0024] To achieve the second technical objective, the present invention provides a method for measuring the thickness of a secondary battery electrode, comprising: an electrode thickness measuring step in which, when an electrode is transported by a plurality of electrode transport rollers, a sensor unit measures the thickness of the electrode using the secondary battery electrode thickness measuring device; and a sensor unit correction step in which, when the transport of the electrode by the plurality of electrode transport rollers is stopped, the sensor unit is moved to a correction unit to perform zero-point correction of the sensor unit.

[0025] In some embodiments, when the transfer of the electrode by a plurality of electrode transfer rollers resumes after the sensor unit calibration step, the sensor unit may be returned to its pre-movement position to measure the thickness of the electrode, and a sensor unit return step may be further included.

[0026] In some embodiments, prior to the electrode thickness measurement step, a fine adjustment step may be further included in which the upper sensor and the lower sensor correspond using a fine adjustment unit capable of changing the position of one of the upper sensor and the lower sensor on a plane.

[0027] The secondary battery electrode thickness measuring device and the secondary battery electrode thickness measuring method using the same according to the embodiments of the present invention can be used in a winding process and have the effect of enabling zero point adjustment during the winding process.

[0028] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0029] FIG. 1 is a drawing showing a unidirectional perspective view of an electrode thickness measuring device according to one embodiment of the present invention.

[0030] FIG. 2 is a drawing showing a different unidirectional perspective view of an electrode thickness measuring device according to one embodiment of the present invention.

[0031] FIG. 3 is a drawing showing the shape of an electrode thickness measuring device according to one embodiment of the present invention as viewed from above.

[0032] FIG. 4 is a drawing showing the shape of an electrode thickness measuring device according to one embodiment of the present invention as viewed from the left.

[0033] FIG. 5 is a drawing showing the shape of an electrode thickness measuring device according to an embodiment of the present invention as viewed from the front.

[0034] FIG. 6 is a drawing showing the shape of an electrode thickness measuring device according to an embodiment of the present invention as viewed from the right.

[0035] FIG. 7 is a drawing illustrating an electrode thickness measurement method according to exemplary embodiments of the present invention.

[0036] Hereinafter, preferred embodiments of the concept of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the concept of the present invention may be modified in various different forms, and the scope of the concept of the present invention should not be interpreted as being limited by the embodiments described below. It is preferable to interpret the embodiments of the concept of the present invention as being provided to more completely explain the concept of the present invention to those with average knowledge in the art. Identical reference numerals denote identical elements throughout. Furthermore, various elements and areas in the drawings are depicted schematically. Accordingly, the concept of the present invention is not limited by the relative sizes or spacing depicted in the accompanying drawings.

[0037] Terms such as first, second, etc. may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the concept of the present invention, the first component may be named the second component, and conversely, the second component may be named the first component.

[0038] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the concept of the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, expressions such as “comprising” or “having” are intended to indicate the existence of the features, number, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, actions, components, parts, or combinations thereof.

[0039] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by those skilled in the art to which the concept of the present invention pertains. Furthermore, it will be understood that commonly used terms, such as those defined in advance, should be interpreted as having meanings consistent with their intent in the context of the relevant technology, and should not be interpreted in an overly formal sense unless explicitly defined herein.

[0040] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described in succession may be performed substantially simultaneously or in the reverse order of the description.

[0041] In the accompanying drawings, variations of the depicted shapes may be expected, for example, depending on manufacturing technology and / or tolerances. Accordingly, embodiments of the present invention should not be interpreted as being limited to specific shapes of the areas depicted herein, but should include, for example, variations in shape resulting from the manufacturing process. All terms "and / or" used herein include each of the mentioned components and all combinations of one or more thereof. Additionally, the term "substrate" as used herein may refer to the substrate itself, or a laminated structure including the substrate and a certain layer or film formed on its surface. Furthermore, the term "surface of the substrate" in this specification may refer to the exposed surface of the substrate itself, or the outer surface of a certain layer or film formed on the substrate.

[0042]

[0043] (1st embodiment)

[0044] FIG. 1 is a drawing showing a unidirectional perspective view of an electrode thickness measuring device (1) according to one embodiment of the present invention.

[0045] FIG. 2 is a drawing showing a different directional perspective view of an electrode thickness measuring device (1) according to one embodiment of the present invention.

[0046] FIG. 3 is a drawing showing the shape of an electrode thickness measuring device (1) according to one embodiment of the present invention as viewed from above.

[0047] FIG. 4 is a drawing showing the shape of an electrode thickness measuring device (1) according to one embodiment of the present invention as viewed from the left.

[0048] FIG. 5 is a drawing showing the shape of an electrode thickness measuring device (1) according to one embodiment of the present invention as viewed from the front.

[0049] FIG. 6 is a drawing showing the shape of an electrode thickness measuring device (1) according to one embodiment of the present invention as viewed from the right.

[0050] Referring to FIGS. 1 to 6, a secondary battery electrode thickness measuring device (1) according to one embodiment of the present invention may include a side base member (11), a lower base member (12), a plurality of electrode transfer rollers (13), a sensor unit (15), a moving unit (14), and a correction unit (16).

[0051] The above side base member (11) can support other configurations connected to the above side base member (11).

[0052] The lower base member (12) can be combined with the side base member (11).

[0053] The plurality of electrode transfer rollers (13) are supported by the side base member (11), support the electrode (131), and can transfer the electrode (131) in one direction.

[0054] The above electrode includes an electrode current collector and an active material coated on the electrode current collector, and the electrode is formed through several processes, so the thickness of the electrode may not be uniform.

[0055] Accordingly, the sensor unit (15) can measure the thickness of an electrode located in the space between two of the plurality of electrode transfer rollers (13).

[0056] The above moving part (14) can move the above sensor part (15).

[0057] In some embodiments, the moving part (14) can move the sensor part (15) out of the space between the two electrode transfer rollers (13) to the correction part (16).

[0058] In some embodiments, the moving part (14) can move the sensor part (15) in the +Y direction or the -Y direction.

[0059] In some embodiments, the moving part (14) can move the sensor part (15) in the -Y direction to move it to the correction part (16).

[0060] The space between the two electrode transfer rollers (13) may be a rectangular plane formed by an end line connecting the two axes of the two electrode transfer rollers (13) and the ends of the two electrode transfer rollers (13), and a three-dimensional space formed by an axis perpendicular to the rectangular plane.

[0061]

[0062] The above correction unit (16) can zero-point correct the above sensor unit (15).

[0063] The above correction unit (16) can improve the accuracy of the thickness measured by the secondary battery electrode thickness measuring device (1) by zeroing the sensor unit (15).

[0064]

[0065] In some embodiments, the sensor unit (15) may include an upper sensor (15a) for measuring the upper part of the electrode; and a lower sensor (15b) for measuring the lower part of the electrode, positioned at a location corresponding to the upper sensor (15a).

[0066] The upper sensor (15a) and lower sensor (15b) may be arranged in a line perpendicular to a plane (e.g., XY plane) formed on both sides by the axes of the two electrode transfer rollers (13).

[0067] The axes of the upper sensor (15a) and lower sensor (15b) arranged in the above row may be located on a straight line (e.g., the Z-axis).

[0068] The electrode is positioned between the upper sensor (15a) and the lower sensor (15b), so that the thickness of the electrode can be measured by the sensor unit (15).

[0069] In some embodiments, the moving part (14) can move the sensor part (15) to the correction part (16) when the transfer of the electrode by the plurality of electrode transfer rollers (13) is stopped.

[0070] In some embodiments, the moving part (14) can move the sensor part (15) in the -Y direction to move it to the correction part (16).

[0071] In some embodiments, the correction unit (16) may be located outside the space between the two electrode transfer rollers (13) and in a three-dimensional space formed by a plane formed by the extensions of the axes of the two electrode transfer rollers (13) and an axis perpendicular to the plane.

[0072] In some embodiments, the correction part (16) may be located at a point perpendicular to the direction of transport of the electrode.

[0073] In some embodiments, the sensor unit (15) may be moved to the correction unit (16) and zeroed by the correction unit (16).

[0074] In some embodiments, the moving part (14) can return the moved sensor part (15) to its previous position when the transfer of the electrode by the plurality of electrode transfer rollers (13) is resumed.

[0075] In some embodiments, the moving part (14) can move the sensor part (15) in the +Y direction to return it to its previous position.

[0076]

[0077]

[0078] In some embodiments, the moving part (14) may include a moving support part (14a) that is supported by the lower base member (12) and coupled to the lower base member (12); and a moving member (14b) that can move on the moving support part (14a).

[0079] In some embodiments, the movable support member (14a) includes a rail provided in the direction of the correction member (16), and the movable member (14b) is mounted on the rail so that the movable member (14b) can move in the direction of the correction member (16).

[0080] In some embodiments, the moving member (14b) may be driven by an external power source.

[0081] In some embodiments, the sensor portion (15) comprises: an upper sensor holding portion (15a1) for holding the upper sensor (15a); a lower sensor holding portion (15b1) for holding the lower sensor (15b); and a sensor holding portion coupling member (15c) for coupling with the upper sensor holding portion (15a1) and the lower sensor holding portion (15b1), wherein the sensor holding portion coupling member (15c) may be coupled with the moving member (14b).

[0082] In some embodiments, the upper sensor holding portion (15a1) can hold the upper sensor (15a) in the axial and vertical directions.

[0083] The upper sensor holding part (15a1) can increase space efficiency by holding the upper sensor (15a) in the axial and vertical directions.

[0084] In some embodiments, the lower sensor holding portion (15b1) can hold the lower sensor (15b) in the axial and vertical directions.

[0085] The lower sensor holding part (15b1) can increase space efficiency by holding the lower sensor (15b) in the axial and vertical directions.

[0086] The sensor holding part coupling member (15c) is coupled with the moving member (14b) so that the upper sensor holding part (15a1) and the lower sensor holding part (15b1) can move as a single unit.

[0087] In some embodiments, the moving part (14) may further include a fine adjustment part (14c) capable of changing the position of one of the upper sensor (15a) and the lower sensor (15b) in a plane so that the upper sensor (15a) and the lower sensor (15b) correspond to each other.

[0088] In some embodiments, the fine adjustment unit (14c) is positioned on the upper surface of the moving member (14b) and can move integrally with the moving member (14b).

[0089] The axes of the upper sensor (15a) and the lower sensor (15b) can be corrected to align through the fine adjustment unit (14c).

[0090]

[0091] In some embodiments, the sensor portion (15) comprises: an upper sensor holding portion (15a1) for holding the upper sensor (15a); a lower sensor holding portion (15b1) for holding the lower sensor (15b); and a sensor holding portion coupling member (15c) for coupling with the upper sensor holding portion (15a1) and the lower sensor holding portion (15b1), wherein the sensor holding portion coupling member (15c) may be coupled with the moving member (14b) and the fine adjustment portion (14c).

[0092] The sensor holding part coupling member (15c) is coupled with the moving member (14b) so that the upper sensor holding part (15a1) and the lower sensor holding part (15b1) can move as a whole, and is coupled with the fine adjustment part (14c) so that the position of the sensor part (15) can be finely adjusted.

[0093] In some embodiments, the correction unit (16) includes a correction block (16a) disposed between the upper sensor (15a) and the lower sensor (15b) when zero-point correcting the sensor unit (15); and a correction block support unit (16b) supporting the correction block (16a), and the actual thickness of the correction block (16a) can be input to a correction control unit (not shown) that controls the correction unit.

[0094] The actual thickness of the correction block (16a) is input, and zero point adjustment may be possible by comparing it with the measured thickness of the correction block (16a) measured by the sensor unit (15).

[0095] In some embodiments, the correction block (16a) may be spaced apart from and adjacent to the end portions of the plurality of electrode transfer rollers (13).

[0096] In some embodiments, the correction block support (16b) supports the correction block (16a), so that the correction block (16a) is spaced apart from and adjacent to the end portions of the plurality of electrode transfer rollers (13).

[0097] In some embodiments, the correction block (16a) may be spaced apart from and adjacent to the end portions of two of the plurality of electrode transfer rollers (13) that form a space in which the sensor portion (15) measures the thickness of the electrode.

[0098]

[0099] In some embodiments, the axial direction of the plurality of electrode transfer rollers (13) may be perpendicular to the transfer direction of the electrode.

[0100] In some embodiments, the correction block (16a) may be spaced apart from and adjacent to the end portion of the plurality of electrode transfer rollers (13), and positioned in a direction perpendicular to the transfer direction of the electrode.

[0101] In some embodiments, when zeroing the sensor unit (15), the correction block (16a) may be placed between the upper sensor (15a) and the lower sensor (15b).

[0102] In some embodiments, the zero point correction may be to match the actual thickness of the correction block (16a) with the measured thickness of the correction block (16a) measured by the sensor unit (15).

[0103]

[0104] (2nd Example)

[0105] FIG. 7 is a drawing illustrating an electrode thickness measurement method according to exemplary embodiments of the present invention.

[0106] Referring to FIG. 7, a secondary battery electrode thickness measurement method according to one embodiment of the present invention may include an electrode thickness measurement step (S2) and a sensor part correction step (S3).

[0107] In the above electrode thickness measurement step (S2), when the electrode is transported by a plurality of electrode transport rollers (13) using the above secondary battery electrode thickness measurement device (1), the sensor unit (15) can measure the thickness of the electrode.

[0108] In the above sensor unit correction step (S3), when the transfer of electrodes by a plurality of electrode transfer rollers (13) is stopped, the sensor unit (15) can be moved to the correction unit (16) to correct the sensor unit (15) to zero.

[0109]

[0110] In some embodiments, when the transfer of the electrode by the plurality of electrode transfer rollers (13) resumes after the sensor unit correction step (S3), the sensor unit return step (S4) may be further included to return the sensor unit (15) to its previous position and measure the thickness of the electrode.

[0111] In some embodiments, prior to the electrode thickness measurement step (S2), a fine adjustment step (S1) may be further included in which the upper sensor (15a) and the lower sensor (15b) correspond using a fine adjustment unit (14c) capable of changing the position of one of the upper sensor (15a) and the lower sensor (15b) on a plane.

[0112]

[0113] As described above, although embodiments of the present invention have been described in detail, a person skilled in the art to which the present invention pertains will be able to modify and implement the present invention in various ways without departing from the spirit and scope of the present invention as defined in the appended claims. Therefore, future modifications to the embodiments of the present invention will not depart from the technology of the present invention.

[0114]

[0115] [Explanation of the symbol]

[0116] 1 : Electrode thickness measuring device

[0117] 11: Side base member

[0118] 12 : Base missing

[0119] 13: Electrode transfer roller

[0120] 131: Electrode

[0121] 14 : Moving part

[0122] 14a : Movable support

[0123] 14b : Moving member

[0124] 14c : Fine-tuning section

[0125] 15 : Sensor section

[0126] 15a: Upper sensor

[0127] 15a1: Upper sensor holding part

[0128] 15b : Lower sensor

[0129] 15b1: Lower sensor holding part

[0130] 15c : Sensor holding part coupling member

[0131] 16 : Correction section

[0132] 16a : Correction block

[0133] 16b : Correction block support

[0134] S1: Fine-tuning step

[0135] S2: Electrode thickness measurement step

[0136] S3: Sensor unit calibration step

[0137] S4: Sensor unit return step

Claims

1. Fixed side base member; A lower base member combined with the above-mentioned side base member; A plurality of electrode transfer rollers supported by the above-mentioned side base member, supporting an electrode, and transferring the electrode in one direction; A sensor unit for measuring the thickness of an electrode located in the space between two of the plurality of electrode transfer rollers; A moving part capable of moving the above sensor part; and A secondary battery electrode thickness measuring device comprising: a correction unit that zero-point corrects the above sensor unit.

2. In Paragraph 1, The sensor unit above is, An upper sensor for measuring the upper part of the above electrode; and A secondary battery electrode thickness measuring device comprising: a lower sensor positioned at a position corresponding to the upper line and measuring the lower part of the electrode.

3. In Paragraph 1, The above moving part is, When the transfer of the electrode by the above plurality of electrode transfer rollers is stopped, A secondary battery electrode thickness measuring device that moves the above sensor unit to the above correction unit.

4. In Paragraph 3, The above moving part is, When the transfer of electrodes by multiple electrode transfer rollers is resumed, A secondary battery electrode thickness measuring device that returns the above-mentioned moved sensor part to its previous position.

5. In Paragraph 1, The above moving part is, A movable support member supported by the lower base member and coupled to the lower base member; and A secondary battery electrode thickness measuring device comprising: a movable member capable of moving on the above-mentioned movable support.

6. In Paragraph 5, The sensor unit above is, An upper sensor holding part for holding the upper sensor; A lower sensor holding part for holding the lower sensor; and A sensor holding part coupling member coupled to the upper sensor holding part and the lower sensor holding part; comprising A secondary battery electrode thickness measuring device in which the sensor holding member coupling member is coupled with the moving member.

7. In Paragraph 5, The above moving part is, A secondary battery electrode thickness measuring device further comprising: a fine adjustment unit capable of changing the position of one of the upper sensor and the lower sensor in a plane so that the upper sensor and the lower sensor correspond to each other.

8. In Paragraph 7, The sensor unit above is, An upper sensor holding part for holding the upper sensor; A lower sensor holding part for holding the lower sensor; and A sensor holding part coupling member coupled to the upper sensor holding part and the lower sensor holding part; comprising A secondary battery electrode thickness measuring device in which the sensor holding part coupling member is coupled with the moving member and the fine adjustment part.

9. In Paragraph 1, The above correction unit is, When zero-point calibration of the above sensor unit, a calibration block disposed between the upper sensor and the lower sensor; and It includes a correction block support member that supports the above correction block; and A secondary battery electrode thickness measuring device in which the actual thickness of the above correction block is input.

10. In Paragraph 9, The above correction block is, A secondary battery electrode thickness measuring device spaced apart from and adjacent to the end portions of the plurality of electrode transfer rollers.

11. In Paragraph 9, The above zero point correction is, A secondary battery electrode thickness measuring device that matches the actual thickness of the correction block with the measured thickness of the correction block measured by the sensor unit.

12. An electrode thickness measuring step in which, using the secondary battery electrode thickness measuring device of claim 1, a sensor unit measures the thickness of the electrode when the electrode is transported by a plurality of electrode transport rollers; and A method for measuring the thickness of a secondary battery electrode, comprising: a sensor unit correction step in which, when the transfer of the electrode by a plurality of electrode transfer rollers is stopped, the sensor unit is moved to a correction unit and the sensor unit is zero-point corrected.

13. In Paragraph 12, After the above sensor unit calibration step, When the transfer of electrodes by multiple electrode transfer rollers is resumed, A secondary battery electrode thickness measurement method further comprising a sensor part return step of returning the sensor part to its previous position to measure the thickness of the electrode.

14. In Paragraph 12, Before the above electrode thickness measurement step, A method for measuring the thickness of a secondary battery electrode, further comprising a fine adjustment step in which the upper sensor and the lower sensor correspond using a fine adjustment unit capable of changing the position of one of the upper sensor and the lower sensor on a plane.

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