SYSTEMS AND METHODS FOR INLINE MONITORING PROPERTIES OF A RAILWAY DURING A MANUFACTURING PROCESS

Abstract

A system for monitoring (900) properties of a web (110) during a roll-to-roll manufacturing process, comprising: a first roller (212) configured to contact a first side of the web (110) as the web (110) moves over it, the first roller (212) comprising a first contact strip (220) and a second contact strip (222), each formed of an electrically conductive material and extending circumferentially around the first roller (212), the first contact strip (220) and the second contact strip (222) being axially spaced on the first roller (212); a measuring system (140) that is functionally coupled to the first contact strip (220) and the second contact strip (222), wherein the measuring system (140) is configured as follows: to apply a voltage to the first contact strip (220) of the first roller (212) while the web (110) moves over it in such a way that the voltage is conducted through the web (110) to the second contact strip (222); to measure the voltage received by the second contact strip (222) (916); and to determine local resistance values ​​relative to positions of the track (110) on the basis of the difference between the voltage (914) applied to the first contact strip (220) and the voltage received by the second contact strip (222); a second roller (214) configured to contact the first side of the web (110) as the web (110) moves over it, the second roller (214) comprising a third contact strip (224) formed from the electrically conductive material and extending circumferentially around the second roller (214); a third roller configured to contact a second side of the web (110) as the web (110) moves over it, wherein the second roller (214) and the third roller are aligned relative to a passage plane of the web (110) such that the web (110) moves between the second roller (214) and the third roller and is contacted by both the second roller (214) and the third roller simultaneously, wherein the third roller comprises a fourth contact strip (226) formed of the electrically conductive material and extending circumferentially around the third roller, wherein the third contact strip (224) and the fourth contact strip (226) are aligned relative to a passage plane of the web (110); wherein the measuring system (140) is functionally coupled to the third contact strip (224) and the fourth contact strip (226), wherein the measuring system (140) is configured as follows: to apply a voltage to the third contact strip (224) of the second roller (214) while the web (110) moves over it, such that the voltage (914) is conducted through the web (110) to the fourth contact strip (226) of the third roller; to measure the voltage received by the fourth contact strip (226); To determine local through-plane resistance values ​​relative to the positions of the track (110) based on the difference between the voltage applied to the third contact strip (224) and the voltage received by the fourth contact strip (226), wherein a first measuring pair, defined by the first contact strip 220 and the fourth contact strip 226, is aligned on opposite sides of the track 110 and in contact with it, and where the voltage is applied over a thickness of the track (110), that is, the passage plane.

Description

[0001] The technical field generally refers to roll-to-roll processes and in particular to systems and methods for inline monitoring of electronic properties for quality control during the roll-to-roll manufacturing of webs, such as certain electrode materials for electrochemical cells.

[0002] Electric vehicles (EVs), such as battery electric vehicles (BEVs), hybrid vehicles, and / or fuel cell vehicles, comprise one or more electric motors and a battery system with one or more battery cells, modules, and / or packs. A power management system is used to control the charging and / or discharging of the battery system during charging and / or driving. Electric vehicle manufacturers are constantly striving to increase the power density of battery cells to extend vehicle range, typically using lithium-ion battery cells (LIBs) because these are currently well-suited for high-power applications.

[0003] DE 10 2007 052 ​​609 A1 discloses a method for evaluating electrically conductive printed structures, as well as a device, in particular for carrying out such a method, and a printing press incorporating such a device. The method provides for the printing of electrically conductive structures, such as transistors, for the production of electronic circuits. A conductivity test is performed transversely to the direction of travel of the web material running through the printing press using one or more measuring rollers equipped with spaced-apart ring electrodes. These rollers are in contact with the printed electrically conductive structure for measuring electrical resistance or for testing short-circuit strength. The measurement signals are transmitted wirelessly to a receiver and can also be used in a closed control loop to influence the printing parameters or the control technology of the printing press.

[0004] US Patent 5,537,048 A discloses a device and a method for processing materials using a scanning roller, wherein the scanning roller has a plurality of conductive rings separated by rings of dielectric material. The detection of capacitances or impedances between the electrodes provides information about the thickness of the materials being processed, the position of wires within them, and other similar material properties.

[0005] Accordingly, there is a constant need for systems and processes that can provide improved battery cells.

[0006] A system for monitoring the properties of a web during a roll-to-roll manufacturing process is provided. In one example, the system comprises a first roller configured to contact a first side of the web as the web moves over it, wherein the first roller includes a first contact strip formed of an electrically conductive material and extending circumferentially around the first roller; a second roller configured to contact a second side of the web as the web moves over it, wherein the first and second rollers are oriented relative to a passage plane of the web such that the web moves between the first and second rollers and is contacted by both the first and second rollers simultaneously, and wherein the second roller includes a second contact strip.which is formed from the electrically conductive material and extends circumferentially around the second roller, wherein the first contact strips and the second contact strips are aligned relative to a transit plane of the web, and a measuring system is functionally coupled to the first contact strips and the second contact strips, wherein the measuring system is configured to apply a voltage to the first contact strips of the first roller while the web is moved over it, so that the voltage is conducted through the web to the second contact strips of the second roller, to measure the voltage received by the second contact strips, and to determine local resistance values ​​relative to positions of the web based on the difference between the voltage applied to the first contact strips and the voltage received by the second contact strips.

[0007] In various examples, the first role of the system can comprise a first electrically conductive cylindrical body and a first insulating material arranged between the first electrically conductive cylindrical body and the first contact strip, wherein the second role comprises a second electrically conductive cylindrical body and a second insulating material arranged between the second electrically conductive cylindrical body and the second contact strip.

[0008] In various examples, the first roller of the system can comprise a first cylindrical body and the first contact strip is arranged within a first recess of the first cylindrical body such that the radially outermost surfaces of the first contact strip are flush with the radially outermost surfaces of the first cylindrical body next to the first contact strip, wherein the second roller comprises a second cylindrical body and the second contact strip is arranged within a second recess of the second cylindrical body such that the radially outermost surfaces of the second contact strip are flush with the radially outermost surfaces of the second cylindrical body next to the second contact strip.

[0009] In various examples, the first and second rolls of the system can be calender rolls designed to exert pressure on the web during a calendering process.

[0010] In various examples, the system's measurement system can be configured to determine at least one property of the path with respect to the path's positions based on the local resistance values.

[0011] A system for monitoring the properties of a web during a roll-to-roll manufacturing process is provided. In one example, the system comprises a first roll configured to contact the first side of the web as the web moves over it, wherein the first roll includes a first contact strip and a second contact strip, each formed of an electrically conductive material and extending circumferentially around the first roll, the first contact strip and the second contact strip being axially spaced on the first roll; a measuring system functionally coupled to the first contact strip and the second contact strip; the measuring system configured to apply a voltage to the first contact strip of the first roll as the web moves over it, such that the voltage is conducted through the web to the second contact strip.to measure the voltage received by the second contact strip and to determine local resistance values ​​relative to positions of the track based on the difference between the voltage applied to the first contact strip and the voltage received by the second contact strip.

[0012] In various examples, the first role of the system can comprise a first electrically conductive cylindrical body, a first insulating material arranged between the first electrically conductive cylindrical body and the first contact strip, and a second insulating material arranged between the first electrically conductive cylindrical body and the second contact strip.

[0013] In various examples, the first role of the system can comprise a first cylindrical body, the first contact strip is arranged within a first recess of the first cylindrical body, and the second contact strip is arranged within a second recess of the first cylindrical body, wherein the radially outermost surfaces of the first contact strip and the second contact strip are flush with the radially outermost surfaces of the first cylindrical body.

[0014] In various examples, the system's primary role can be a leadership role, trained to maintain an alignment or position of the track.

[0015] In various examples, the system's measurement system can be designed to determine at least one property of the track with respect to the track's positions based on the local resistance values.

[0016] In various examples, the system can include a second roller configured to contact the first side of the web as the web moves over it, wherein the second roller includes a third contact strip formed from the electrically conductive material and extending circumferentially around the second roller, and a third roller configured to contact a second side of the web as the web moves over it, wherein the second roller and the third roller are oriented relative to a transit plane of the web such that the web moves between the second roller and the third roller and is contacted by both the second roller and the third roller simultaneously, wherein the third roller has a fourth contact strip formed from the electrically conductive material and extending circumferentially around the third roller.wherein the third and fourth contact strips are aligned relative to a through-plane of the web. The measuring system can be functionally coupled to the third and fourth contact strips, wherein the measuring system is configured to apply a voltage to the third contact strip of the second roller while the web is moved over it, so that the voltage is conducted through the web to the fourth contact strip of the third roller, to measure the voltage received by the fourth contact strip, and to determine local through-plane resistance values ​​relative to the positions of the web based on the difference between the voltage applied to the third contact strip and the voltage received by the fourth contact strip.

[0017] A method is provided for monitoring the properties of a web during a roll-to-roll manufacturing process.In an example, the procedure may include moving the web through a station comprising a first roller, such that the web touches the first roller, wherein the first roller comprises a first contact strip formed of an electrically conductive material and extending circumferentially around the first roller; applying a voltage to the first contact strip of the first roller while moving the web through the station, such that the voltage conducts through the web to a second contact strip; measuring the voltage received by the second contact strip; determining local resistance values ​​relative to positions of the web based on the difference between the voltage applied to the first contact strip and the voltage received by the second contact strip; and determining at least one property of the web relative to the positions of the web based on the local resistance values.

[0018] In various examples, the second contact strip of the method can extend circumferentially around a second roller, wherein the method can include positioning the second roller in contact with the web directly opposite the first roller, such that the web is moved between the first roller and the second roller while the first roller and the second roller exert pressure on the web, and such that the first contact strip and the second contact strip are aligned, wherein determining the local resistance values ​​can include determining through-plane resistance values ​​of the web.

[0019] In various examples, the second contact strip can extend circumferentially around the first roller in a position axially spaced from the first contact strip, and determining the local resistance values ​​can include determining plane resistance values ​​of the web.

[0020] In various examples, the procedure can involve generating a map that shows the local resistance values ​​at the positions of the track.

[0021] In various examples, the procedure can include detecting a defect in the track based on local resistance values.

[0022] In various examples, the method can include determining the uniformity of a coating on the track based on the local resistance values.

[0023] In various examples, the method can include detecting a misalignment of a first coating on a first side of the web and a second coating on a second side of the web based on the local resistance values.

[0024] In various examples, the path of the process can be designed in such a way that it can be segmented to form a plurality of electrodes for electrochemical cells.

[0025] In various examples, the procedure can involve monitoring, based on the local resistance values, the lengths of sections of the track designed to define each of the plurality of electrodes after subsequent segmentation of the track.

[0026] The exemplary embodiments are described below in conjunction with the following drawings, where identical numbers denote identical elements and where: Fig. Figure 1 schematically represents a part of an exemplary roll-to-roll processing system, which includes various stations for carrying out different processing steps on a web according to an example; Fig. Figure 2 is a perspective view of an exemplary role pair of the role-to-role processing system of Fig. 1 with contact strips according to an example; Fig. Figure 3 schematically shows a cross-sectional view of a pair of contact strips of Fig. 2 in contact with the railway according to an example; Fig. Figure 4 schematically shows a partial cross-sectional view of one of the contact strips of Fig. 2. [This is illustrated by an example;] Fig. Figure 5 is a perspective view of a role in the role-to-role processing system of Fig. 1 with pairs of contact strips according to an example; Fig. Figure 6 schematically shows a cross-sectional view of a pair of contact strips of Fig. 5 in contact with the railway according to an example; Fig. Figure 7 is a perspective view showing the pair of rollers from Fig. 2 shows the processing of a web which contains a cathode insulation coating according to an example; Fig. Figure 8 is a perspective view showing the pair of rollers from Fig. 2 shows the processing of a track which, according to an example, is provided with patch coatings; and Fig. Figure 9 is a flowchart illustrating a procedure for monitoring the properties of a web during a manufacturing process according to an example.

[0027] In short, this document presents systems and methods for enhancing quality control during roll-to-roll web manufacturing through in-line electronic monitoring of properties. The systems and methods are discussed in relation to the production of electrodes for electrochemical cells. However, they are not limited to such applications and can also be used for other uses, such as the production of sheets, paper products, various thin films, etc. Although the systems and methods are described here in relation to determining local resistance values, they can alternatively be used to determine local capacitance values ​​as well.

[0028] Electrochemical cells (also referred to here as battery cells) typically comprise multiple unit cells, each containing cathode and anode electrodes. The cathode electrodes include a cathode current collector and an electroactive cathode material arranged on the cathode current collector. The anode electrodes include an anode current collector and an electroactive anode material arranged on the anode current collector. Separators are positioned between the pairs of cathode and anode electrodes. In lithium (Li) battery cells, a lithium metal anode can be formed on the anode current collector and used as an additional lithium source (e.g., for pre-lithiation) to improve energy density while ensuring sufficient battery life.

[0029] Various methods can be used to manufacture electrodes for electrochemical cells. For example, electrode materials can be formed or deposited directly onto a web, such as a current collector foil, at high production rates using roll-to-roll processes. These roll-to-roll processes can include various steps (and / or stations), such as preparing an electrode slurry, coating the web with the slurry and drying to form a coating, calendering, and various other downstream processes like laser notching, infrared drying, etc.

[0030] In some examples, the substrate of the track can consist of a dense or porous foil made of a metallic material such as copper (Cu), nickel (Ni), titanium (Ti), stainless steel, or their alloys. In other examples, the substrate can consist of a non-metallic material such as carbon or a polymer. In some examples, the coating layer(s) (e.g., electrode material(s)) on the substrate can have a thickness ranging from 1 µm to 80 µm.

[0031] In Fig. Figure 1 shows part of an exemplary roll-to-roll processing system with various stations for performing different processing steps on a web 110. In this example, the depicted part includes a calendering station 100, which receives the web 110 from an upstream station (not shown), and a rewinding station 101, which transfers the web 110 to a downstream station (not shown). The arrangement shown is merely exemplary, and the calendering station 100 and the rewinding station 101 can have various other configurations.

[0032] In this example, the web 110 can be processed while simultaneously being transported over various rollers. The calendering process can be carried out, for example, to achieve the desired properties of the web 110 and thus of the final product (e.g., a plurality of electrodes). Calendering rollers 112, 114 can exert pressure, with or without heat, to compress the web 110 as it passes between them. Others in Fig. The rollers 116-138 shown can have various functions, such as aligning the web 110, maintaining a desired tension of the web 110, etc.

[0033] To enable electronic inline property monitoring of the web 110, one or more of the calender rolls 112, 114, the other rolls 116-138, or rolls assigned to other stations of the roll-to-roll processing system (collectively referred to here as rolls) can have contact strips exposed on the surfaces of the rolls and extending around them. The contact strips are designed to physically contact the web 110 during processing and, in combination with a measuring system 140 electrically coupled to it, to monitor local resistance values ​​of the web 110. The contact strips can be made of various electrically conductive materials, such as different metallic materials. In the example of Fig. 1. The measuring system 140 is functionally coupled to contact strips of the calender rolls 112, 114, and to some of the other rolls 116, 134, and 136. However, the measuring system 140 can also be coupled to contact strips of fewer or more of the rolls.

[0034] Fig. Figure 2 presents a first example comprising a pair of rollers, such as the calender rollers 112, 114, arranged on opposite sides of the web 110 and in contact with it. In this example, the pair of rollers (also referred to as the first roller 212 and the second roller 214) each comprises three contact strips arranged opposite a corresponding contact strip on the other side of the first and second rollers 212, 214. In particular, the first roller 212 comprises a first contact strip 220, a second contact strip 222, and a third contact strip 224, and the second roller 214 comprises a fourth contact strip 226, a fifth contact strip 228, and a sixth contact strip 230.The first contact strip 220 and the fourth contact strip 226 are directly opposite each other, with the track 110 between them to define a first measuring pair; the second contact strip 222 and the fifth contact strip 228 are directly opposite each other, with the track 110 between them to define a second measuring pair; and the third contact strip 224 and the sixth contact strip 230 are directly opposite each other, with the track 110 between them to define a third measuring pair. Each of the contact strips 220-230 is functionally coupled to the measuring system 140.

[0035] Fig. Figure 3 shows a partial cross-sectional view of an area within a box 250 of Fig. Figure 2. As shown, the first measuring pair, defined by the first contact strip 220 and the fourth contact strip 226, is aligned on opposite sides of the track 110 and in contact with it. In this example, the track 110 comprises a substrate 260, on whose opposite sides the first and second electrode coatings 262, 264 are applied. The second and third measuring pairs of Fig. 2 can have similar arrangements.

[0036] During operation, the measuring system 140 can apply a voltage between each of the first, second, and third measurement pairs across a thickness of the track 110 (i.e., the through-plane). From this voltage, the measuring system 140 can determine through-plane resistance values ​​that correspond to positions on the track 110. The resistance values ​​between the first, second, and third measurement pairs can be compared with each other and / or with reference values. These through-plane resistance values ​​can be used to monitor the quality of the track 110 in real time.

[0037] In some examples, the contact strips are designed to have no or only a minimal influence on the processing of web 110. For this purpose, the contact strips can be flush with the adjacent surfaces of the rollers. Fig. Figure 4 shows, for example, a cross-sectional view of part of a contact strip 420 and the adjacent surfaces of a roller 412. In this example, both the contact strip 420 and the roller 412 are conductive. The contact strip 420 can be made of a metallic material or a conductive rubber material, for example, and the roller 412 can be made of a metallic material, such as stainless steel. In some examples, the contact strip 420 and the roller 412 can be made of the same material. Since both are conductive, an insulating layer 470 made of an insulating material is arranged between the contact strip 420 and the roller 412. The insulating material can be, for example, diamond, certain non-conductive ceramic materials, or a non-conductive polymeric material (e.g., polyurethane).Both the contact strip 420 and the insulating layer 470 comprise radial outer surfaces that are flush with the adjacent radial outer surfaces of the roller 412.

[0038] Fig. 5 represents a second example, which is a role 512, like one of the other roles 116-138 of Fig. 1, comprising, which is in contact with the web 110. In this example, the roller 512 comprises six contact strips arranged in three axially spaced adjacent pairs. In particular, the roller 512 comprises a first and second contact strip 520, 522, which define a first measuring pair, a third and fourth contact strip 524, 526, which define a second measuring pair, and a fifth and sixth contact strip 528, 530, which define a third measuring pair.

[0039] Fig. Figure 6 shows a partial cross-sectional view of an area within a box 550 of Fig. Figure 5. As shown, the first measuring pair, defined by the first contact strip 520 and the second contact strip 522, is each in contact with the track 110 and is functionally coupled to the measuring system 140. The second and third measuring pairs of Fig. 5 can have similar arrangements.

[0040] During operation, the measuring system 140 can apply a voltage between each of the first, second, and third measuring pairs through axial sections of the track 110 in between. From this voltage, the measuring system 140 can determine in-plane resistance values ​​that correspond to positions on the track 110, and these in-plane resistance values ​​can be used to monitor the quality of the track 110 in real time.

[0041] In this example, the roller 512 can be made of an insulating material, such as certain insulating rubbers. As such, the contact strips 520-530 can be embedded in the roller 512 without an insulating layer in between.

[0042] In the first examples of Fig. 2-4 and the second example of Fig. 5-6 The local resistance values ​​(through plane, in plane, or both) can be used to monitor quality deviation across and along the track 110. Furthermore, the resistance values ​​can be used to detect defects in the track 110, such as contamination, pinholes, agglomerations, etc., which alter the local resistance values. In some examples, the electrode properties (e.g., the resistivity) can be considered to monitor coating uniformity based on the resistance values ​​and the ratio between the layer thickness and the track resistance.

[0043] The track can contain various additional coatings or layers. For example, Fig. Figure 7 shows a track 810 configured to be segmented to form a plurality of electrodes for electrochemical cells, which are processed by the first and second rollers 212, 214. The track 810 includes a cathode insulation coating 811, i.e., a dielectric coating, arranged along an edge of the track 810 on one or both sides thereof. In this example, the first contact strip 220 and the fourth contact strip 226 are configured to contact the cathode insulation coating 811 as the track 810 moves between the first and second rollers 212, 214. The measuring system 140 can determine local resistance values ​​along the cathode insulation coating 811 to, for example, detect defects in the cathode insulation coating 811.

[0044] The track may contain areas with uncoated substrate (e.g. foil). Fig. Figure 8 shows, for example, a web 910 with a patch or skip coating, i.e., discrete coatings applied to specific sections of the web with bare substrate in between. In this example, the web 910 contains coated sections 909 separated by uncoated sections 911 extending across the web 910. The web 910 is processed by the first and second rollers 212 and 214, respectively. The local resistance values ​​determined by the measuring system 140 can be used, for example, to determine the edge quality of the coated sections 909, to monitor the lengths of the coated sections 909 along the web 910, to detect misalignment of the coated sections 909 applied to opposite sides of the web 910, to detect misshaped coated sections 909, or to detect damage to the substrate within the uncoated sections 911.

[0045] With reference to Fig. 9 and with continued reference to Fig. Figures 1-8 show a flowchart of a process 900 for monitoring the properties of a web during a manufacturing process according to various examples. As can be seen from the disclosure, the sequence of steps within process 900 is not limited to those shown in Fig. The sequential execution shown in 9 is limited, but can be carried out in one or more varying sequence(s), depending on applicability and in accordance with the present disclosure.

[0046] In one example, the procedure 900 can start at 910.

[0047] In 912, the procedure 900 can involve moving the web through a station containing a first roller, so that the web contacts the first roller. The first roller includes a first contact strip formed of an electrically conductive material and extending circumferentially around the first roller.

[0048] In 914, the procedure 900 can involve applying a voltage to the first contact strip of the first roller while the web is moved through the station, so that the voltage is passed through the web to a second contact strip.

[0049] In the case of 916, the procedure 900 can include measuring the voltage received from the second contact strip.

[0050] In 918, the procedure 900 can include determining local resistance values ​​relative to positions of the track based on the difference between the voltage applied to the first contact strip and the voltage received by the second contact strip.

[0051] At 920, the procedure 900 can include determining at least one property of the path with respect to the positions of the path based on the local resistance values.

[0052] Procedure 900 can end at 922.

[0053] Method 900 can determine various properties of the track based on local resistance values. For example, local resistance values ​​can be used to detect a defect in the track, determine the uniformity of a coating on the track, detect misalignment of a first coating on one side of the track and a second coating on the other side, and so on. In some examples, the track is designed to be segmented to form multiple electrodes for electrochemical cells, and the method can involve monitoring, based on local resistance values, the lengths of track segments designed to define each electrode during subsequent segmentation.

[0054] The systems and methods disclosed here offer several advantages over certain existing systems and methods. For example, the local resistance values ​​obtained by the system measurement can be used to determine inline, real-time properties of the track, which can be used for quality control during the manufacture of various products, such as electrodes for electrochemical cells.

Claims

[1] A system for monitoring (900) properties of a web (110) during a roll-to-roll manufacturing process, comprising: a first roller (212) configured to contact a first side of the web (110) as the web (110) moves over it, the first roller (212) comprising a first contact strip (220) and a second contact strip (222), each formed of an electrically conductive material and extending circumferentially around the first roller (212), the first contact strip (220) and the second contact strip (222) being axially spaced on the first roller (212); a measuring system (140) that is functionally coupled to the first contact strip (220) and the second contact strip (222), wherein the measuring system (140) is configured as follows: to apply a voltage to the first contact strip (220) of the first roller (212) while the web (110) moves over it in such a way that the voltage is conducted through the web (110) to the second contact strip (222); to measure the voltage received by the second contact strip (222) (916); and to determine local resistance values ​​relative to positions of the track (110) on the basis of the difference between the voltage (914) applied to the first contact strip (220) and the voltage received by the second contact strip (222); a second roller (214) configured to contact the first side of the web (110) as the web (110) moves over it, the second roller (214) comprising a third contact strip (224) formed from the electrically conductive material and extending circumferentially around the second roller (214); a third roller configured to contact a second side of the web (110) as the web (110) moves over it, wherein the second roller (214) and the third roller are aligned relative to a passage plane of the web (110) such that the web (110) moves between the second roller (214) and the third roller and is contacted by both the second roller (214) and the third roller simultaneously, wherein the third roller comprises a fourth contact strip (226) formed of the electrically conductive material and extending circumferentially around the third roller, wherein the third contact strip (224) and the fourth contact strip (226) are aligned relative to a passage plane of the web (110); wherein the measuring system (140) is functionally coupled to the third contact strip (224) and the fourth contact strip (226), wherein the measuring system (140) is configured as follows: to apply a voltage to the third contact strip (224) of the second roller (214) while the web (110) moves over it, such that the voltage (914) is conducted through the web (110) to the fourth contact strip (226) of the third roller; to measure the voltage received by the fourth contact strip (226); To determine local through-plane resistance values ​​relative to the positions of the track (110) based on the difference between the voltage applied to the third contact strip (224) and the voltage received by the fourth contact strip (226), wherein a first measuring pair, defined by the first contact strip 220 and the fourth contact strip 226, is aligned on opposite sides of the track 110 and in contact with it, and where the voltage is applied over a thickness of the track (110), that is, the passage plane. [2] System according to claim 1, wherein the first roll (212) comprises a first electrically conductive cylindrical body, a first insulating material arranged between the first electrically conductive cylindrical body and the first contact strip (220), and a second insulating material arranged between the first electrically conductive cylindrical body and the second contact strip (222). [3] System according to claim 1, wherein the first roller (212) comprises a first cylindrical body, the first contact strip (220) is arranged within a first recess of the first cylindrical body, and the second contact strip (222) is arranged within a second recess of the first cylindrical body, wherein radial outer surfaces of the first contact strip (220) and the second contact strip (222) are flush with radial outer surfaces of the first cylindrical body. [4] System according to claim 1, wherein the measuring system (140) is configured to determine at least one property (920) of the track (110) relative to the positions of the track (110) based on the local resistance values ​​(918). [5] A method for monitoring (900) the properties of a web (110) during a roll-to-roll manufacturing process, comprising: Moving (912) the track (110) through a station comprising a first roller (212) such that the track (110) contacts the first roller (212), wherein the first roller (212) comprises a first contact strip (220) formed of an electrically conductive material and extends circumferentially around the first roller (212); Applying (914) a voltage to the first contact strip (220) of the first roller (212) while the track (110) is moved through the station, so that the voltage is conducted through the track (110) to a second contact strip (222); measuring (916) the voltage received by the second contact strip (222); Determine (918) local resistance values ​​relative to positions of the track (110) based on the difference between the voltage applied to the first contact strip (220) and the voltage received by the second contact strip (222); and Determine (920) at least one property of the orbit (110) relative to the positions of the orbit (110) based on the local resistance values, Contacting the first side of the web (110) by a second roller (214) while the web (110) moves over it, the second roller (214) comprising a third contact strip (224) formed from the electrically conductive material and extending around the second roller (214); Contacting a second side of the web (110) by a third roller as the web (110) moves over it, wherein the second roller (214) and the third roller are aligned relative to a passage plane of the web (110) such that the web (110) moves between the second roller (214) and the third roller and is contacted by both the second roller (214) and the third roller simultaneously, wherein the third roller comprises a fourth contact strip (226) formed from the electrically conductive material and extending circumferentially around the third roller, wherein the third contact strip (224) and the fourth contact strip (226) are aligned relative to a passage plane of the web (110); wherein the measuring system (140) is functionally coupled to the third contact strip (224) and the fourth contact strip (226); Applying a voltage to the third contact strip (224) of the second roller (214) while the web (110) moves over it, so that the voltage (914) is conducted through the web (110) to the fourth contact strip (226) of the third roller; Measuring the voltage received by the fourth contact strip (226); Determine local through-plane resistance values ​​relative to the positions of the track (110) based on the difference between the voltage applied to the third contact strip (224) and the voltage received by the fourth contact strip (226); wherein a first measuring pair, defined by the first contact strip 220 and the fourth contact strip 226, is aligned on opposite sides of the track 110 and in contact with it, and where the voltage is applied over a thickness of the track (110), that is, the passage plane. [6] Method according to claim 5, wherein the second contact strip (222) extends circumferentially around a second roller (214), the method comprising positioning the second roller (214) in contact with the web (110) directly opposite the first roller (212), such that the web (110) moves between the first roller (212) and the second roller (214) while the first roller (212) and the second roller (214) exert pressure on the web (110), and such that the first contact strip (220) and the second contact strip (222) are aligned with each other, the determination (918) of local resistance values ​​comprising determining through-plane resistance values. [7] Method according to claim 5, wherein the second contact strip (222) extends circumferentially around the first roller (212) in a position axially spaced from the first contact strip (220), wherein determining (918) local resistance values ​​includes determining plane resistance values ​​of the web (110). [8] Method according to claim 5, further comprising: Generating a map showing the local resistance values ​​(918) at the positions of the track (110), Detecting a defect in the track (110) based on the local resistance values Determining the uniformity of a coating on the track (110) based on the local resistance values, or Detecting a misalignment of a first coating on a first side of the track (110) and a second coating on a second side of the track (110) based on the local resistance values. [9] The method of claim 5, further comprising: Segmenting the track (110) to form a plurality of electrodes for electrochemical cells, and Monitoring, based on the local resistance values, of lengths of sections of the track (110) which are designed to define each of the plurality of electrodes in the subsequent segmentation of the track (110).

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