Area density measurement method, area density measurement system, and computer device

Abstract

The application relates to a surface density measurement method and system. The method comprises the following steps: obtaining a single-face pole piece by performing cross-web scanning on the single-face pole piece by using a radiation source, and obtaining a single-face pole piece cross-web scanning result, wherein the single-face pole piece cross-web scanning result comprises a blank area scanning result of a blank area of the single-face pole piece and a single-face coating area scanning result of a single-face coating area of the single-face pole piece; obtaining a double-face pole piece by performing cross-web scanning on the double-face pole piece by using the radiation source, and obtaining a double-face pole piece cross-web scanning result, wherein the double-face pole piece is obtained by coating the single-face pole piece, and the double-face pole piece cross-web scanning result comprises a double-face coating area scanning result of a double-face coating area of the double-face pole piece; and analyzing the single-face pole piece cross-web scanning result and the double-face pole piece cross-web scanning result to obtain a surface density of the pole piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery measurement, in particular to a surface density measurement method, a surface density measurement system, a surface density measurement device, a computer device, a computer readable storage medium, and a computer program product. BACKGROUND

[0002] In the technical field of batteries, taking lithium batteries as an example, in the production process of lithium batteries, the surface density of the single-sided or double-sided coating of the dry film lithium battery pole piece is usually measured to prevent lithium battery over-specification lithium precipitation, which leads to batch rejection. In the traditional surface density measurement process of single-sided or double-sided coating of batteries, a surface density measurement system composed of multiple scanning frames is used to measure the surface density of the pole piece. Among them, the surface density measurement system contains three scanning frames, the first scanning frame scans to obtain the surface density of the substrate before coating, the second scanning frame scans to obtain the surface density of the pole piece (substrate+A side coating, hereinafter referred to as single-sided pole piece) after single-sided coating, and the third scanning frame scans to obtain the surface density of the pole piece (substrate+A side coating+B side coating, hereinafter referred to as double-sided pole piece) after double-sided coating. Then, the surface densities obtained by the multiple scanning frames are combined to calculate the surface densities of the A side coating and the B side coating.

[0003] However, the inventors of the present application found that the measurement accuracy of the surface density obtained by this surface density measurement method is low. SUMMARY

[0004] Therefore, it is necessary to provide one or more of a surface density measurement method, a surface density measurement system, a surface density measurement device, a computer device, a computer readable storage medium, and a computer program product with high measurement accuracy in view of the above technical problems.

[0005] In a first aspect, the present application provides a surface density measurement method. The method comprises:

[0006] obtaining a single-sided pole piece cross-section scanning result by cross-section scanning of the single-sided pole piece by a radiation source, the single-sided pole piece cross-section scanning result comprising a blank area scanning result of a blank area of the single-sided pole piece and a single-sided coating area scanning result of a single-sided coating area of the single-sided pole piece;

[0007] obtaining a double-sided pole piece cross-section scanning result by cross-section scanning of the double-sided pole piece by the radiation source, the double-sided pole piece being a pole piece obtained by coating the single-sided pole piece, the double-sided pole piece cross-section scanning result comprising a double-sided coating area scanning result of a double-sided coating area of the double-sided pole piece;

[0008] analyzing the single-sided pole piece cross-section scanning result and the double-sided pole piece cross-section scanning result to obtain the surface density of the pole piece.

[0009] According to the method of the embodiment of the present application, only single-sided pole pieces and double-sided pole pieces are subjected to cross-web scanning, the single-sided pole pieces are subjected to cross-web scanning, and the obtained single-sided pole piece cross-web scanning result includes the blank area scanning result of the blank area of the single-sided pole piece and the single-sided coating area scanning result of the single-sided pole piece. Thus, the surface density of the pole piece is obtained by analyzing the single-sided pole piece cross-web scanning result and the double-sided pole piece cross-web scanning result. That is, the measurement result of the surface density can be obtained by two times of cross-web scanning, the cost is reduced, the influence of the environment in which the uncoated substrate is located and the environment in which the single-sided pole piece after coating is located on the measurement precision is avoided, and the influence of the same point precision difference (for example, the same track scanning, the walking distance, the cross-web scanning position, etc.) of the three scanning frames on the measurement precision is avoided, thereby improving the precision of the obtained surface density measurement result.

[0010] In some embodiments, the single-sided pole piece cross-web scanning result is obtained by cross-web scanning the single-sided pole piece after drying, and the double-sided pole piece cross-web scanning result is obtained by cross-web scanning the double-sided pole piece after drying.

[0011] Thus, the single-sided pole piece cross-web scanning result and the double-sided pole piece cross-web scanning result are obtained by cross-web scanning after drying the single-sided pole piece and the double-sided pole piece. The environment, for example, the humidity and the temperature, for drying the single-sided pole piece and the double-sided pole piece is basically the same, thereby ensuring the similarity of the environment to which the obtained single-sided pole piece cross-web scanning result and the double-sided pole piece cross-web scanning result are directed. The influence of the environment in which the single-sided pole piece after coating and the double-sided pole piece after coating are located on the measurement precision is further avoided, and the precision of the obtained surface density measurement result is further improved.

[0012] In some embodiments, the single-sided pole piece cross-web scanning result is obtained by cross-web scanning the single-sided pole piece by using a narrow spot radiation source, and the double-sided pole piece cross-web scanning result is obtained by cross-web scanning the double-sided pole piece by using the narrow spot radiation source.

[0013] Thus, the single-sided pole piece and the double-sided pole piece are cross-web scanned by using the narrow spot radiation source. The lateral resolution of the narrow spot radiation source is higher, and thus the resolution of the cross-web scanning result obtained by the scanning frame in the cross-web scanning process in the lateral direction is also higher. Thus, the surface density determined accordingly is also more accurate, and the precision of the obtained surface density measurement result is further improved.

[0014] In some embodiments, the width of the narrow spot radiation source is less than the tab width of the tabs of the pole piece.

[0015] Therefore, by making the width of the narrow spot ray source less than the tab width of the tab of the pole piece, the spot of the narrow spot ray source can be made to fall entirely within the range of the tab, which is extremely narrow, and since no coating is applied to the tab, the blank area of the pole piece is essentially left blank, so that more energy of the ray source can be detected in the blank area and the coating area of the pole piece, the resolution is higher, and the identification capability of the real edge profile of the substrate and the coating can be improved.

[0016] In some embodiments, the method further comprises: analyzing the single-sided pole piece width scan result and the double-sided pole piece width scan result to obtain an identification result of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal.

[0017] Since the single-sided pole piece and the double-sided pole piece are scanned by the narrow spot ray source, the lateral resolution of the narrow spot ray source is higher, so that the identification of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal can be made accordingly, so that the quality of the obtained pole piece can be improved accordingly.

[0018] In some embodiments, the single-sided pole piece width scan result obtained by scanning the single-sided pole piece by the ray source includes:

[0019] The first scan result obtained by scanning the single-sided pole piece by the ray source is obtained.

[0020] The first scan result is analyzed to identify the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece.

[0021] The single-sided pole piece width scan result is obtained based on the first scan result, the single-sided pole piece blank area width and the single-sided coating area width.

[0022] Therefore, after the first scan result is obtained by scanning the single-sided pole piece by the ray source, the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width are identified, and then the blank area scan result of the blank area of the single-sided pole piece and the single-sided coating area scan result are obtained based on the identified single-sided pole piece blank area width and single-sided coating area width. In the case of scanning the single-sided pole piece by the narrow spot ray source, the lateral resolution of the narrow spot ray source is higher, the identification capability of the real edge profile of the substrate and the coating can be improved, the identified single-sided pole piece blank area width and single-sided coating area width are more accurate, so that the blank area scan result of the blank area of the single-sided pole piece and the single-sided coating area scan result obtained thereon are also more accurate.

[0023] In some embodiments, the obtaining the second scanning result by performing a cross-web scan on the double-sided pole piece by using a ray source comprises:

[0024] obtaining the second scanning result by performing a cross-web scan on the double-sided pole piece by using a ray source;

[0025] analyzing the second scanning result to identify a double-sided pole piece margin width of a margin region of the double-sided pole piece and a double-sided coating region width of a double-sided coating region of the double-sided pole piece;

[0026] obtaining the double-sided pole piece cross-web scan result based on the second scanning result, the double-sided pole piece margin width and the double-sided coating region width.

[0027] Thus, after the second scanning result is obtained by performing a cross-web scan on the double-sided pole piece by using a ray source, the double-sided pole piece margin width of a margin region of the double-sided pole piece and the double-sided coating region width of a double-sided coating region of the double-sided pole piece are identified, and then the double-sided pole piece margin scan result of the margin region of the double-sided pole piece and the double-sided coating region scan result of the double-sided coating region are obtained based on the identified double-sided pole piece margin width and double-sided coating region width. In the case of performing a cross-web scan on the double-sided pole piece by using a narrow spot ray source, the lateral resolution of the narrow spot ray source is higher, which can improve the identification ability of the real edge profile of the substrate and the coating, and the identified double-sided pole piece margin width and double-sided coating region width are more accurate, so that the double-sided pole piece margin scan result of the margin region of the double-sided pole piece and the double-sided coating region scan result of the double-sided coating region obtained thereon are also more accurate.

[0028] In some embodiments, the analyzing the single-sided pole piece cross-web scan result and the double-sided pole piece cross-web scan result to obtain the areal density measurement result of the pole piece comprises:

[0029] analyzing the single-sided pole piece cross-web scan result to obtain a substrate areal density and a first surface coating areal density of the pole piece;

[0030] analyzing the single-sided pole piece cross-web scan result and the double-sided pole piece cross-web scan result to obtain a second surface coating areal density of the pole piece.

[0031] Thus, the substrate areal density and the first surface coating areal density of the pole piece can be obtained through the single-sided pole piece cross-web scan result, and the second surface coating areal density of the pole piece can be obtained by combining the single-sided pole piece cross-web scan result and the double-sided pole piece cross-web scan result, so that the determination of the substrate, the first surface coating and the second surface coating areal density of the pole piece is realized.

[0032] In some embodiments, the margin area scanning result of the margin area of the single-sided pole piece includes a margin area ray absorption rate of the margin area of the single-sided pole piece, and the single-sided coating area scanning result of the single-sided pole piece includes a single-sided coating area ray absorption rate of the single-sided pole piece.

[0033] The analysis according to the cross-section scanning result of the single-sided pole piece includes obtaining a substrate area density and a first surface coating area density of the single-sided pole piece.

[0034] The first surface coating ray absorption rate is obtained according to the margin area ray absorption rate and the single-sided coating area ray absorption rate.

[0035] The first surface coating area density is obtained according to the first surface coating ray absorption rate.

[0036] Therefore, the first surface coating area density can be obtained by combining the received margin area ray absorption rate of the margin area of the single-sided pole piece, the single-sided coating area ray absorption rate of the single-sided pole piece, and the conversion relationship between the ray absorption rate and the area density.

[0037] In some embodiments, the double-sided coating area scanning result includes a double-sided coating area ray absorption rate of the double-sided pole piece.

[0038] The analysis according to the cross-section scanning result of the single-sided pole piece and the cross-section scanning result of the double-sided pole piece includes obtaining a second surface coating area density of the double-sided pole piece.

[0039] The second surface coating ray absorption rate is obtained according to the single-sided coating area ray absorption rate and the double-sided coating area ray absorption rate.

[0040] The second surface coating area density is obtained according to the second surface coating ray absorption rate.

[0041] Therefore, the second surface coating area density can be obtained by combining the received double-sided coating area ray absorption rate of the double-sided pole piece and the conversion relationship between the ray absorption rate and the area density.

[0042] In a second aspect, the embodiments of the present application provide a surface density measurement system, wherein the system includes two scanning frames, one of which is arranged at a position through which a single-sided pole piece passes, and the other of which is arranged at a position through which a double-sided pole piece passes, the double-sided pole piece being a pole piece obtained after coating the single-sided pole piece, each of the scanning frames performing cross-section scanning on a margin area and a coating area of a pole piece passing through the scanning frame, and the surface density of the pole piece is measured and obtained according to the cross-section scanning results of the two scanning frames.

[0043] In some embodiments, one of the scanning frames is arranged at a position through which a single-sided pole piece passes after being baked, and the other scanning frame is arranged at a position through which a double-sided pole piece passes after being baked.

[0044] In some embodiments, the ray source of the scanning frame is a narrow-spot ray source.

[0045] In some embodiments, the width of the narrow-spot ray source is less than the tab width of the tabs of the pole piece.

[0046] In the third aspect, the present application provides a surface density measuring device, wherein the device comprises:

[0047] The scanning result acquisition module acquires a single-sided pole piece widthwise scanning result obtained by widthwise scanning a single-sided pole piece by a ray source, the single-sided pole piece widthwise scanning result comprising a blank area scanning result of a blank area of the single-sided pole piece and a single-sided coating area scanning result of a single-sided coating area of the single-sided pole piece; and acquires a double-sided pole piece widthwise scanning result obtained by widthwise scanning a double-sided pole piece by the ray source, the double-sided pole piece being a pole piece obtained after coating the single-sided pole piece, the double-sided pole piece widthwise scanning result comprising a double-sided coating area scanning result of a double-sided coating area of the double-sided pole piece.

[0048] The analysis module is configured to analyze the single-sided pole piece widthwise scanning result and the double-sided pole piece widthwise scanning result to obtain the surface density of the pole piece.

[0049] In some embodiments, the single-sided pole piece widthwise scanning result is obtained by widthwise scanning the baked single-sided pole piece, and the double-sided pole piece widthwise scanning result is obtained by widthwise scanning the baked double-sided pole piece.

[0050] In some embodiments, the single-sided pole piece widthwise scanning result is obtained by widthwise scanning the single-sided pole piece by a narrow-spot ray source, and the double-sided pole piece widthwise scanning result is obtained by widthwise scanning the double-sided pole piece by the narrow-spot ray source.

[0051] In some embodiments, the width of the narrow-spot ray source is less than the tab width of the tabs of the pole piece.

[0052] In some embodiments, the analysis module is further configured to analyze the single-sided pole piece widthwise scanning result and the double-sided pole piece widthwise scanning result to obtain an identification result of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal.

[0053] In some embodiments, the scanning result obtaining module is configured to: obtain a first scanning result by performing a cross-web scan on the single-sided pole piece using a radiation source; analyze the first scanning result to identify a single-sided pole piece margin area width of a margin area of the single-sided pole piece and a single-sided coating area width of the single-sided pole piece; and obtain the cross-web scan result of the single-sided pole piece based on the first scanning result, the single-sided pole piece margin area width, and the single-sided coating area width.

[0054] In some embodiments, the scanning result obtaining module is configured to: obtain a second scanning result by performing a cross-web scan on the double-sided pole piece using a radiation source; analyze the second scanning result to identify a double-sided pole piece margin area width of a margin area of the double-sided pole piece and a double-sided coating area width of the double-sided pole piece; and obtain the cross-web scan result of the double-sided pole piece based on the second scanning result, the double-sided pole piece margin area width, and the double-sided coating area width.

[0055] In a fourth aspect, the present application provides a computer device, comprising a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor implements the steps of the method in any of the above embodiments.

[0056] In a fifth aspect, the present application provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by the processor, the processor implements the steps of the method in any of the above embodiments.

[0057] In a sixth aspect, the present application provides a computer program product, comprising a computer program, and when the computer program is executed by the processor, the processor implements the steps of the method in any of the above embodiments.

[0058] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 It is a schematic diagram of a face density measurement system and its application environment;

[0060] Figure 2 It is a schematic diagram of a face density measurement system and its application environment of some embodiments of the present application;

[0061] Figure 3 It is a contrastive schematic diagram of using a narrow spot radiation source and a circular spot radiation source to irradiate a pole piece in some embodiments;

[0062] Figure 4 Flowchart of the surface density measurement method of some embodiments of the present application;

[0063] Figure 5 Flowchart of the surface density measurement method of some embodiments of the present application;

[0064] Figure 6 Block diagram of the surface density measurement device of some embodiments of the present application;

[0065] Figure 7 Block diagram of the computer device of some embodiments of the present application.

[0066] Reference signs in the detailed description of the embodiments are as follows:

[0067] Substrate 10;

[0068] Drying device 20, 30;

[0069] Film roll 40;

[0070] Scanning frame 101, 102, 103, 201, 202;

[0071] Tab 301;

[0072] Coating area 302;

[0073] Blank area 303;

[0074] Circular light spot 310;

[0075] Narrow light spot 320. DETAILED DESCRIPTION

[0076] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0078] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0079] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects have an“or” relationship.

[0080] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0081] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0082] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0083] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0084] In the field of battery technology, taking lithium battery as an example, in the production process of lithium battery, the area density of single or double side coating of dry film lithium battery pole piece is usually measured. In the traditional area density measurement process of battery, the area density of the pole piece is measured by an area density measurement system composed of multiple scanning frames. As shown in the reference Figure 1 The area density measurement system contains three scanning frames 101, 102 and 103. The first scanning frame 101 scans the area density of the substrate 10 before coating, the second scanning frame 102 scans the area density of the pole piece with single side coating (substrate+A side coating, hereinafter referred to as single side pole piece), and the third scanning frame 103 scans the area density of the pole piece with double side coating (substrate+A side coating+B side coating, hereinafter referred to as double side pole piece). Specifically, the substrate 10 moves in the direction of the coating machine, for example, as shown by the dashed arrow in the figure, the scanning frame 101 first scans the substrate 10 without coating, obtains the substrate scanning result, the substrate 10 is coated on one side to obtain a single side pole piece and is dried in the drying device 20, then passes through the scanning frame 102, the scanning frame 102 performs ray scanning on the single side pole piece to obtain the scanning result of the single side pole piece, the other side of the dried single side pole piece is coated to obtain a double side pole piece, and after drying in the drying device 30, the double side pole piece passes through the scanning frame 103, the scanning frame 103 performs ray scanning on the double side pole piece to obtain the scanning result of the double side pole piece. The dried double side pole piece is further moved along the coating machine to obtain a film roll 40.

[0085] Based on the obtained substrate scanning result, the scanning result of the single side pole piece and the scanning result of the double side pole piece, the area densities of the substrate and the two coatings of the two sides of the substrate can be obtained by calculation. For example, based on the substrate scanning result, the area density of the substrate can be obtained, based on the scanning result of the single side pole piece, the area density of the substrate+one side coating (such as A side coating) can be obtained, and the area density of the A side coating can be obtained by subtracting the two. Based on the scanning result of the double side pole piece, the area density of the substrate+double side coating (such as A side coating+B side coating) can be obtained, and the area density of the B side coating can be obtained by subtracting the area density of the substrate+double side coating from the area density of the substrate+one side coating.

[0086] The inventors of this application noted that when obtaining the substrate scanning results, the substrate is in a room temperature environment. When obtaining the scanning results for single-sided and double-sided electrodes, the scans are typically performed on dried single-sided and double-sided electrodes, i.e., in a drying environment or an environment adjacent to a drying environment. This drying environment differs significantly from the room temperature environment of the substrate, for example, in terms of temperature and humidity. Furthermore, online independent monitoring of the A and B sides of the coating requires simultaneous scanning and deduction of the substrate's net weight. During high-speed scanning, the accuracy difference at the same point is ≤ ±5 mm. The measurement accuracy of simultaneous deduction by multiple scanners is affected by ambient temperature, tension changes, and tape travel distance, and exhibits lag. For example, the tension of lithium batteries during coating production varies within the range of ±3 Newtons (N), and the tape travel distance at the unwinding end is affected by correction and tension changes, making real-time compensation and monitoring impossible. Figure 1 As shown, when the electrode 10 reaches the scanning frame 101 and then the scanning frame 102 after passing through the drying equipment 20, the tension exerted on the electrode by the coating belt is different in the scanning frames 101 and 102, making accurate synchronization impossible. These factors all affect the accuracy of areal density measurement. Furthermore, scanning using three scanning frames occupies a large space and is costly.

[0087] Based on the above considerations, in order to improve the accuracy of areal density measurement, the inventors, after in-depth research, have provided an areal density measurement system that uses two scanning frames to measure the areal density of electrode sheets. One scanning frame scans a single-sided electrode sheet, simultaneously obtaining the scanning results of both the blank area and the coated area. In other words, a single scanning frame can simultaneously obtain the scanning results of both the blank area and the coated area of ​​a single-sided electrode sheet, and the areal density can be determined based on these results. This solves the problem of the impact on accuracy caused by different environmental factors such as temperature and humidity, as well as the impact of different stresses on the substrate and the single-sided electrode sheet, when using multiple scanning frames.

[0088] Please refer to Figure 2 This application provides an areal density measurement system, which includes two scanning frames 201 and 202. One scanning frame 201 is positioned at the location where a single-sided electrode passes, and the other scanning frame 202 is positioned at the location where a double-sided electrode passes. The double-sided electrode is an electrode obtained by coating a single-sided electrode. Each scanning frame 201 and 202 performs a horizontal scan on the blank area and coated area of ​​the electrode passing through it. Based on the horizontal scan results of the two scanning frames 201 and 202, the areal density of the electrode is measured.

[0089] In this context, the blank area of ​​the electrode refers to the uncoated area, while the coated area refers to the area on the electrode coated with a layer. Since the coating process on the electrode is intermittent, meaning there are uncoated areas between adjacent coated areas, this embodiment refers to the coated area on the electrode as the coated region. Figure 3 The example shown is a partially coated electrode sheet. Region 302 on the electrode sheet is coated with a coating, referred to as the coated region in this embodiment. There are uncoated blank regions 303 between the coated regions. The tab region 301 is located on the outer side of the electrode sheet and is also uncoated. Therefore, in this embodiment, the tab region 301 is also a blank region. That is, in this embodiment, the blank region includes the tab region and the area between two adjacent coated regions.

[0090] Among them, horizontal scanning refers to scanning back and forth at a certain angle, such as perpendicular, to the forward direction of the electrode. The electrode moves along the length of the coating area on the coating machine, combined with... Figure 3 Taking the partial electrode shown as an example, it moves vertically, while horizontal scanning refers to moving at a certain angle to the length of the coated area, such as vertically. Figure 3 The image shows the scanner moving back and forth, allowing it to scan both the blank area and the coated area within one scanning cycle.

[0091] Based on this areal density scanning system, during the movement of the substrate 10 along the direction of the coating machine, the substrate 10 undergoes a single-sided coating to obtain a single-sided electrode sheet. After drying in the drying equipment 20, it passes through one of the scanning frames 201. The scanning frame 201 performs X-ray scanning on the single-sided electrode sheet, specifically performing a horizontal scan on the blank area and the coated area of ​​the single-sided electrode sheet. Subsequently, the other side of the dried single-sided electrode sheet is coated to obtain a double-sided electrode sheet. After drying in the drying equipment 30, the double-sided electrode sheet passes through another scanning frame 202. The scanning frame 202 performs X-ray scanning on the double-sided electrode sheet, specifically performing a horizontal scan on the blank area and the coated area of ​​the double-sided electrode sheet. Based on the horizontal scan results of the two scanning frames 201 and 202, the areal density of the electrode sheet is measured and obtained.

[0092] Based on the cross-web scanning results of the two gantries 201, 202, the areal density of the substrate and the two coatings of the two sides of the substrate can be obtained through calculation. For example, based on the scanning results obtained by cross-web scanning of the blank area and the coated area of the single-sided pole piece by one of the gantries 201, the areal density of the substrate and the areal density of one of the coatings of the substrate (for example, the A-side coating, referred to as the first coating areal density in the following examples) can be obtained. Combined with the scanning results obtained by cross-web scanning of the blank area and the coated area of the single-sided pole piece by the gantry 201 and the scanning results obtained by cross-web scanning of the blank area and the coated area of the double-sided pole piece by the gantry 202, the areal density of the other coating of the substrate (for example, the B-side coating, referred to as the second coating areal density in the following examples) can be obtained.

[0093] According to some embodiments of the present application, optionally, the scanning results obtained by cross-web scanning of the blank area and the coated area of the single-sided pole piece by one of the gantries 201 can include: the blank area scanning results of the blank area of the single-sided pole piece, and the single-sided coating area scanning results of the single-sided pole piece.

[0094] According to some embodiments of the present application, optionally, it can be that after obtaining the first scanning results by cross-web scanning of the single-sided pole piece by one of the gantries 201, the first scanning results are analyzed to identify the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece; and then based on the first scanning results, the single-sided pole piece blank area width, and the single-sided coating area width, the single-sided pole piece cross-web scanning results are obtained.

[0095] According to some embodiments of the present application, optionally, the blank area scanning results of the blank area of the single-sided pole piece include the blank area radiation absorption rate of the blank area of the single-sided pole piece, and the single-sided coating area scanning results of the single-sided pole piece include the single-sided coating area radiation absorption rate of the single-sided pole piece.

[0096] At this time, in some embodiments, the substrate areal density can be obtained by conversion according to the blank area radiation absorption rate of the blank area of the single-sided pole piece, the first coating radiation absorption rate can be obtained according to the blank area radiation absorption rate and the single-sided coating area radiation absorption rate, for example, the difference between the blank area radiation absorption rate and the single-sided coating area radiation absorption rate is taken as the first coating radiation absorption rate, and the first coating areal density is obtained by conversion according to the first coating radiation absorption rate.

[0097] In other embodiments, the substrate areal density can be obtained by conversion according to the blank area radiation absorption rate of the blank area of the single-sided pole piece. The single-sided coating area density can be obtained by conversion according to the single-sided coating area radiation absorption rate, and the first coating areal density can be obtained by taking the difference between the single-sided coating area density and the substrate areal density.

[0098] According to some embodiments of the present application, the scanning result obtained by the other scanning frame 202 performing the cross-web scanning on the double-sided pole piece can include: the blank area scanning result of the blank area of the single-sided pole piece, and the double-sided coating area scanning result of the double-sided pole piece. It should be understood that in some embodiments, the scanning result can also include the blank area scanning result of the blank area of the double-sided pole piece.

[0099] According to some embodiments of the present application, after the other scanning frame 202 performs the cross-web scanning on the double-sided pole piece to obtain the second scanning result, the second scanning result is analyzed to identify the double-sided pole piece blank area width of the blank area of the double-sided pole piece and the double-sided coating area width of the double-sided pole piece; and then based on the second scanning result, the double-sided pole piece blank area width, and the double-sided coating area width, the double-sided pole piece cross-web scanning result is obtained.

[0100] In some embodiments, the double-sided coating area scanning result of the double-sided pole piece includes the double-sided coating area ray absorption rate of the double-sided pole piece. The blank area scanning result of the blank area of the double-sided pole piece can include the blank area ray absorption rate of the blank area of the double-sided pole piece.

[0101] At this time, in some embodiments, the second surface coating ray absorption rate can be obtained according to the double-sided coating area ray absorption rate in combination with the above-mentioned single-sided coating area ray absorption rate, for example, the difference between the double-sided coating area ray absorption rate and the single-sided coating area ray absorption rate is taken as the second surface coating ray absorption rate, and then the second surface coating ray absorption rate is used for conversion to obtain the second surface coating area density.

[0102] In other embodiments, the double-sided coating area density can be obtained by conversion according to the double-sided coating area ray absorption rate, and the difference between the double-sided coating area density and the single-sided coating area density is taken as the second surface coating area density.

[0103] In other embodiments, the blank area substrate area density of the blank area of the double-sided pole piece can be obtained by conversion according to the blank area ray absorption rate of the blank area of the double-sided pole piece, and the double-sided coating ray absorption rate of the pole piece can be obtained according to the blank area ray absorption rate of the double-sided pole piece and the double-sided coating area ray absorption rate, for example, the difference between the double-sided coating area ray absorption rate and the blank area ray absorption rate of the double-sided pole piece is taken as the double-sided coating ray absorption rate of the pole piece, and then the second surface coating ray absorption rate is calculated and obtained in combination with the double-sided coating ray absorption rate of the pole piece and the first surface coating ray absorption rate, and then the second surface coating ray absorption rate is converted to obtain the second surface coating area density.

[0104] According to the system of the embodiment of the present application, two scanning frames are arranged, each of which can perform cross-web scanning on the blank area and the coating area of the pole piece passing through the scanning frame, so that only two scanning frames are needed, and the measurement result of the area density can be obtained through two times of cross-web scanning, which reduces the cost, avoids the influence of the difference between the environment of the uncoated substrate and the environment of the single-sided pole piece after coating on the measurement accuracy, and avoids the influence of the pressure difference between the uncoated substrate and the single-sided pole piece after coating on the measurement accuracy, thereby improving the accuracy of the obtained measurement result of the area density.

[0105] According to some embodiments of the present application, one of the scanning frames is arranged at a position passed through after the single-sided pole piece is dried, and the other scanning frame is arranged at a position passed through after the double-sided pole piece is dried.

[0106] Therefore, the single-sided pole piece and the double-sided pole piece are dried, and then cross-web scanning is performed to obtain the corresponding single-sided pole piece cross-web scanning result and the double-sided pole piece cross-web scanning result. The environment, such as humidity and temperature, for drying the single-sided pole piece and the double-sided pole piece is basically the same, thereby ensuring the similarity of the environment for obtaining the single-sided pole piece cross-web scanning result and the double-sided pole piece cross-web scanning result, further avoiding the influence of the difference between the environment of the single-sided pole piece after coating and the environment of the double-sided pole piece after coating on the measurement accuracy, and further improving the accuracy of the obtained measurement result of the area density.

[0107] According to some embodiments of the present application, the radiation source of the scanning frame is a narrow spot radiation source.

[0108] Therefore, the single-sided pole piece and the double-sided pole piece are cross-web scanned by the narrow spot radiation source. The lateral resolution of the narrow spot radiation source is higher, so that the lateral resolution of the cross-web scanning result obtained by the scanning frame during cross-web scanning is also higher, so that the area density determined accordingly is also more accurate, and the accuracy of the obtained measurement result of the area density is further improved.

[0109] According to some embodiments of the present application, the width of the narrow spot radiation source is less than the lug width of the lug of the pole piece.

[0110] Reference Figure 3As shown, compared with the circular ray source 310, the width of the narrow spot ray source 320 is obviously reduced, and the width of the narrow spot ray source 320 is less than the tab width of the tab of the pole piece, so that the spot of the rays emitted by the narrow spot ray source 320 can all fall within the range of the tab with higher energy density, thereby further improving the accuracy of the surface density measurement. It should be understood that in the case that the width of the narrow spot ray source 320 is less than the tab width of the tab of the pole piece, if the distance between the narrow spot ray source 320 and the pole piece is large, when the rays of the narrow spot ray source 320 reach the pole piece, all the rays may fall within the range of the tab, or some of the rays may exceed the range of the tab. However, since the narrow spot ray source is used and the width is less than the tab width of the tab of the pole piece, the energy density of the rays in the blank area of the pole piece is still improved, so the accuracy of the surface density measurement can be improved. In actual technical implementation, the distance between the narrow spot ray source 320 and the pole piece can be set so that the spot of the rays of the narrow spot ray source 320 can all fall within the range of the tab, or in other words, the spot formed on the pole piece when the rays of the narrow spot ray source 320 reach the pole piece is less than the range of the tab.

[0111] Therefore, by making the width of the narrow spot ray source less than the tab width of the tab of the pole piece, the spot of the narrow spot ray source can all fall within the range of the tab, and since the tab is not coated, the blank area of the pole piece can essentially be a blank area, so that more rays of the ray source can be detected in the blank area and the coated area of the pole piece, and the resolution is higher, thereby further improving the accuracy of the surface density measurement result.

[0112] Reference Figure 3 As shown, the embodiment of the present application also provides a surface density measurement method, which can be implemented based on the surface density measurement system of the above embodiment. The method comprises steps S101 to S103.

[0113] Step S101: obtaining a single-face pole piece horizontal width scanning result obtained by horizontally width scanning a single-face pole piece by a ray source, the single-face pole piece horizontal width scanning result comprising: a blank area scanning result of a blank area of the single-face pole piece, and a single-face coated area scanning result of a single-face coated area of the single-face pole piece;

[0114] Step S102: obtaining a double-face pole piece horizontal width scanning result obtained by horizontally width scanning a double-face pole piece by a ray source, the double-face pole piece being a pole piece obtained by coating the single-face pole piece, the double-face pole piece horizontal width scanning result comprising: a double-face coated area scanning result of a double-face coated area of the double-face pole piece;

[0115] Step S103: Analyzing the single-sided pole piece width scanning result and the double-sided pole piece width scanning result to obtain the area density of the pole piece.

[0116] According to the method of the embodiments of the present application, only the single-sided pole piece and the double-sided pole piece are width scanned, the single-sided pole piece width scanning result obtained by width scanning the single-sided pole piece includes the blank area scanning result of the blank area of the single-sided pole piece and the single-sided coating area scanning result of the single-sided coating area of the single-sided pole piece, and the area density of the pole piece is obtained by analyzing the single-sided pole piece width scanning result and the double-sided pole piece width scanning result, that is, the measurement result of the area density is obtained by two times of width scanning, the cost is reduced, the influence of the environment in which the uncoated substrate is located and the environment in which the single-sided pole piece after coating is located on the measurement precision is avoided, the influence of the pressure difference between the uncoated substrate and the single-sided pole piece after coating on the measurement precision is avoided, and the precision of the measurement result of the area density is improved.

[0117] According to some embodiments of the present application, optionally, the single-sided pole piece width scanning result is obtained by width scanning the single-sided pole piece after drying, and the double-sided pole piece width scanning result is obtained by width scanning the double-sided pole piece after drying.

[0118] Therefore, the single-sided pole piece width scanning result and the double-sided pole piece width scanning result are obtained by width scanning the single-sided pole piece and the double-sided pole piece after drying, the environment, such as humidity and temperature, for drying the single-sided pole piece and the double-sided pole piece is basically the same, the similarity of the environment for obtaining the single-sided pole piece width scanning result and the double-sided pole piece width scanning result is ensured, the influence of the environment in which the single-sided pole piece after coating is located and the environment in which the double-sided pole piece after coating is located on the measurement precision is further avoided, and the precision of the measurement result of the area density is further improved.

[0119] According to some embodiments of the present application, optionally, the single-sided pole piece width scanning result is obtained by width scanning the single-sided pole piece by using a narrow spot radiation source, and the double-sided pole piece width scanning result is obtained by width scanning the double-sided pole piece by using the narrow spot radiation source.

[0120] Therefore, the single-sided pole piece and the double-sided pole piece are width scanned by using the narrow spot radiation source, the lateral resolution of the narrow spot radiation source is higher, the resolution of the width scanning result obtained by the scanning frame in the width scanning process in the lateral direction is also higher, the area density determined accordingly is also more accurate, and the precision of the measurement result of the area density is further improved.

[0121] According to some embodiments of the present application, optionally, the width of the narrow spot radiation source is less than the tab width of the tab of the pole piece.

[0122] Therefore, by making the width of the narrow spot ray source less than the tab width of the tab of the pole piece, the lateral part of the narrow spot ray source can fall more into the range of the tab, and since the tab is not coated, it is essentially a blank area of the pole piece, so that more energy of the ray source can be detected in the blank area and the coated area of the pole piece, the resolution is higher, and thus the accuracy of the surface density measurement result can be further improved.

[0123] According to some embodiments of the present application, optionally, referring to Figure 4 The surface density measurement method can further include:

[0124] Step S104: analyzing the single-sided pole piece cross-scan result and the double-sided pole piece cross-scan result to obtain an identification result of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal.

[0125] Since the single-sided pole piece and the double-sided pole piece are cross-scanned by the narrow spot ray source, the lateral resolution of the narrow spot ray source is higher, so that the identification of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal can be performed, and thus the quality of the obtained pole piece can be improved.

[0126] According to some embodiments of the present application, optionally, the single-sided pole piece cross-scan result obtained by cross-scanning the single-sided pole piece by the ray source includes:

[0127] The first scanning result obtained by cross-scanning the single-sided pole piece by the ray source is acquired.

[0128] The first scanning result is analyzed to identify the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece.

[0129] The single-sided pole piece cross-scan result is obtained based on the first scanning result, the single-sided pole piece blank area width, and the single-sided coating area width.

[0130] The way of analyzing the first scanning result to identify the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece can be combined with the existing way of identifying the width of each area of the pole piece, and the embodiments of the present application are not limited specifically.

[0131] Therefore, after obtaining the first scan result by performing a horizontal scan of the single-sided electrode sheet using the X-ray source, the width of the blank area and the width of the coating area of ​​the single-sided electrode sheet are identified. Based on these identified widths, the specific scan results of the blank area and the coating area of ​​the single-sided electrode sheet can be obtained. When using a narrow-spot X-ray source for horizontal scanning of the single-sided electrode sheet, the narrow-spot X-ray source has higher lateral resolution, which improves the ability to identify the true edge contours of the substrate and coating. The identified widths of the blank area and the coating area are more accurate, resulting in more accurate scan results of the blank area and the coating area of ​​the single-sided electrode sheet.

[0132] Optionally, according to some embodiments of this application, the above-described method of obtaining the horizontal scanning result of a double-sided electrode sheet by performing a horizontal scan using an X-ray source includes:

[0133] Obtain the second scan result obtained by performing a horizontal scan of the double-sided electrode using an X-ray source;

[0134] The double scan results are analyzed to identify the width of the blank area of ​​the double-sided electrode sheet and the width of the double-sided coating area of ​​the double-sided electrode sheet.

[0135] Based on the second scanning result, the width of the blank area of ​​the double-sided electrode and the width of the double-sided coating area, the horizontal scanning result of the double-sided electrode is obtained.

[0136] The method of analyzing the second scan results to identify the width of the blank area of ​​the double-sided electrode sheet and the width of the double-sided coating area of ​​the double-sided electrode sheet can be combined with existing methods for identifying the width of each region of the electrode sheet. This application embodiment does not make specific limitations.

[0137] Therefore, after obtaining the second scan result by performing a horizontal scan of the double-sided electrode sheet using the X-ray source, the width of the blank area and the width of the double-sided coating area of ​​the double-sided electrode sheet are identified. Based on these identified widths, the specific scan results of the blank area and the double-sided coating area of ​​the double-sided electrode sheet can be obtained. When using a narrow-spot X-ray source for horizontal scanning of the double-sided electrode sheet, the narrow-spot X-ray source has higher lateral resolution, which improves the ability to identify the true edge contours of the substrate and coating. The identified widths of the blank area and the double-sided coating area are more accurate, resulting in more accurate scan results of the blank area and the double-sided coating area of ​​the double-sided electrode sheet.

[0138] According to some embodiments of the present application, optionally, the face density measurement result of the pole piece is obtained by analyzing the single-face pole piece cross-section scan result and the double-face pole piece cross-section scan result, including:

[0139] The base material face density and the first face coating face density of the pole piece are obtained by analyzing the single-face pole piece cross-section scan result.

[0140] The second face coating face density of the pole piece is obtained by analyzing the single-face pole piece cross-section scan result and the double-face pole piece cross-section scan result.

[0141] Therefore, the base material face density and the first face coating face density of the pole piece can be obtained by the single-face pole piece cross-section scan result, and the second face coating face density of the pole piece can be obtained by combining the single-face pole piece cross-section scan result and the double-face pole piece cross-section scan result, so that the face densities of the base material, the first face coating and the second face coating of the pole piece are determined.

[0142] According to some embodiments of the present application, optionally, the margin area scan result of the margin area of the single-face pole piece includes a margin area ray absorption rate of the margin area of the single-face pole piece, and the single-face coating area scan result of the single-face pole piece includes a single-face coating area ray absorption rate of the single-face pole piece.

[0143] The base material face density and the first face coating face density of the single-face pole piece are obtained by analyzing the single-face pole piece cross-section scan result, including:

[0144] The first face coating ray absorption rate is obtained according to the margin area ray absorption rate and the single-face coating area ray absorption rate.

[0145] The first face coating face density is obtained by conversion according to the first face coating ray absorption rate.

[0146] Therefore, the first face coating face density can be obtained by combining the received margin area ray absorption rate of the margin area of the single-face pole piece and the single-face coating area ray absorption rate of the single-face pole piece, and combining the conversion relationship between the absorption rate and the face density.

[0147] According to some embodiments of the present application, optionally, the double-face coating area scan result includes a double-face coating area ray absorption rate of the double-face pole piece.

[0148] The second face coating face density of the double-face pole piece is obtained by analyzing the single-face pole piece cross-section scan result and the double-face pole piece cross-section scan result, including:

[0149] The second face coating ray absorption rate is obtained according to the single-face coating area ray absorption rate and the double-face coating area ray absorption rate.

[0150] The second face coating face density is obtained by conversion according to the second face coating ray absorption rate.

[0151] Thus, the second surface coating area density can be obtained in combination with the received double-sided coating area radiation absorption rate of the double-sided electrode sheet, in combination with the conversion relationship between the absorption rate and the area density.

[0152] According to some embodiments of the present application, the present application provides an area density measurement system and an area density measurement method based on the same. The system includes two scanning frames 201, 202, one of which is arranged at a position where a single-sided electrode sheet passes through, and the other is arranged at a position where a double-sided electrode sheet passes through. During the movement of the substrate 10 along the direction of the coating machine, the substrate 10 passes through the single-sided coating to obtain a single-sided electrode sheet, and after drying in the drying device 20, the single-sided electrode sheet passes through one of the scanning frames 201, which performs radiation scanning on the single-sided electrode sheet. Subsequently, the other side of the dried single-sided electrode sheet is coated to obtain a double-sided electrode sheet, and after drying in the drying device 30, the double-sided electrode sheet passes through the other scanning frame 202, which performs radiation scanning on the double-sided electrode sheet.

[0153] The source window shape and size of the radiation source of the scanning frames 201, 202 are reduced relative to the conventional source window shape, so as to reduce the size of the emitted radiation spot, which falls within the range of the tab of the electrode sheet, so as to improve the detection resolution and further improve the measurement accuracy. That is, the radiation source of the scanning frames 201, 202 is a narrow spot radiation source. By using a narrow spot radiation source, the measurement resolution is improved, and at the same time, a set of detection devices can realize the detection of the area density of the substrate and the coating film area (the coating film area of the single-sided electrode sheet or the double-sided electrode sheet) at the same time, and the substrate and the coating film area are measured synchronously, improving the efficiency of the equipment.

[0154] Specifically, in the coating production of lithium batteries, taking the cross-scan speed as 200 millimeters per second (mm / s) and the integrator response time of the detector as 0.05 seconds (s) as examples, when the lateral width of the emission source spot is 20 millimeters (mm), the width of the effective data used to determine the area density = tab width of the substrate - spot size - offset size. In some embodiments, the offset size is 10 mm, and it should be understood that the faster the cross-scan speed, the larger the offset size. In this case, taking the offset size as 10 mm as an example, the tab width needs to meet a higher width, for example, greater than or equal to 30 mm, but in the actual production process of lithium batteries, the tab width is relatively narrow, therefore, by using a narrow spot to measure the area density, the area density of a very narrow tab can be measured.

[0155] The scanning frame 201 performs horizontal scanning on the single-sided pole piece by a narrow spot ray source to obtain a first scanning result, analyzes the first scanning result, identifies the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece, and obtains a single-sided pole piece horizontal scanning result based on the first scanning result, the single-sided pole piece blank area width and the single-sided coating area width, that is, obtains a blank area scanning result of the blank area of the single-sided pole piece and a single-sided coating area scanning result of the single-sided pole piece.

[0156] The scanning frame 202 performs horizontal scanning on the double-sided pole piece by a narrow spot ray source to obtain a second scanning result; analyzes the second scanning result, identifies the double-sided pole piece blank area width of the blank area of the double-sided pole piece and the double-sided coating area width of the double-sided pole piece; and obtains a double-sided pole piece horizontal scanning result based on the second scanning result, the double-sided pole piece blank area width and the double-sided coating area width, that is, obtains a double-sided coating area scanning result of the double-sided pole piece, which can also include a blank area scanning result of the blank area of the double-sided pole piece.

[0157] Taking the surface density converted according to the ray absorption rate as an example, the surface density of the substrate can be obtained by converting the blank area ray absorption rate of the blank area of the single-sided pole piece obtained by scanning. And the first surface coating ray absorption rate is obtained according to the blank area ray absorption rate of the single-sided pole piece and the single-sided coating area ray absorption rate; the first surface coating surface density is obtained by conversion according to the first surface coating ray absorption rate. Then the second surface coating ray absorption rate is obtained according to the single-sided coating area ray absorption rate and the double-sided coating area ray absorption rate; the second surface coating surface density is obtained by conversion according to the second surface coating ray absorption rate.

[0158] In some embodiments, the conversion can be combined with the relationship between the ray absorption rate and the surface density as follows.

[0159] R = I / I0 = e -λm

[0160] Wherein, R represents the ray penetration rate, I represents the current signal obtained when penetrating the substance, that is, the current signal of the ray received by the receiving end of the scanning frame after passing through the pole piece in the embodiment of the application, I0 represents the current signal obtained when penetrating the air, that is, when there is no pole piece or when there is no other object between the transmitting end and the receiving end of the scanning frame, the current signal of the ray received by the receiving end of the scanning frame, λ represents the absorption coefficient, and m represents the surface density of the substance.

[0161] By converting the above formula, it can be determined that the finally converted surface density of the substance can be represented by the formula:

[0162]

[0163] Further, since the narrow spot emission source is adopted, the emission source has high resolution, so that the thinned area surface density value of the film area edge can be accurately identified, and the concave-convex points, pinholes, scratches and other abnormal conditions existing on the film can also be detected.

[0164] It should be understood that, although each step in the flowchart involved in each embodiment as described above is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0165] Based on the same inventive concept, the embodiments of the present application also provide a surface density measuring device for implementing the surface density measuring method involved in the above-mentioned embodiments. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above-mentioned method, so the specific limitations in one or more surface density measuring device embodiments provided below can refer to the limitations of the surface density measuring method in the above text, which will not be repeated here.

[0166] According to some embodiments of the present application, referring to Figure 6 As shown in the figure, a surface density measuring device is provided, wherein the device comprises: a scanning result acquisition module 601, and an analysis module 602.

[0167] The scanning result acquisition module 601 acquires the single-face pole piece horizontal scanning result obtained by horizontally scanning the single-face pole piece by the ray source, the single-face pole piece horizontal scanning result comprising: the blank area scanning result of the blank area of the single-face pole piece, and the single-face coating area scanning result of the single-face pole piece; and acquires the double-face pole piece horizontal scanning result obtained by horizontally scanning the double-face pole piece by the ray source, the double-face pole piece being a pole piece obtained after coating the single-face pole piece, the double-face pole piece horizontal scanning result comprising: the double-face coating area scanning result of the double-face pole piece;

[0168] The analysis module 602 is configured to analyze the single-face pole piece horizontal scanning result and the double-face pole piece horizontal scanning result to obtain the surface density of the pole piece.

[0169] According to some embodiments of the present application, optionally, the single-sided pole piece widthwise scanning result is a result obtained by widthwise scanning the single-sided pole piece after drying, and the double-sided pole piece widthwise scanning result is a result obtained by widthwise scanning the double-sided pole piece after drying.

[0170] According to some embodiments of the present application, optionally, the single-sided pole piece widthwise scanning result is a result obtained by widthwise scanning the single-sided pole piece by using the narrow spot ray source, and the double-sided pole piece widthwise scanning result is a result obtained by widthwise scanning the double-sided pole piece by using the narrow spot ray source.

[0171] According to some embodiments of the present application, optionally, the width of the narrow spot ray source is less than the tab width of the tab of the pole piece.

[0172] According to some embodiments of the present application, optionally, the analysis module 602 is further configured to analyze the single-sided pole piece widthwise scanning result and the double-sided pole piece widthwise scanning result, and obtain an identification result of whether the surface of the single-sided pole piece and / or the double-sided pole piece is abnormal.

[0173] According to some embodiments of the present application, optionally, the scanning result acquisition module 601 is configured to acquire a first scanning result obtained by widthwise scanning the single-sided pole piece by using the ray source, analyze the first scanning result, identify the single-sided pole piece blank area width of the blank area of the single-sided pole piece and the single-sided coating area width of the single-sided pole piece, and obtain the single-sided pole piece widthwise scanning result based on the first scanning result, the single-sided pole piece blank area width and the single-sided coating area width.

[0174] According to some embodiments of the present application, optionally, the scanning result acquisition module 601 is configured to acquire a second scanning result obtained by widthwise scanning the double-sided pole piece by using the ray source, analyze the second scanning result, identify the double-sided pole piece blank area width of the blank area of the double-sided pole piece and the double-sided coating area width of the double-sided pole piece, and obtain the double-sided pole piece widthwise scanning result based on the second scanning result, the double-sided pole piece blank area width and the double-sided coating area width.

[0175] The above-mentioned various modules in the surface density measuring device can be realized by software, hardware and combinations thereof, in whole or in part. The above-mentioned various modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned various modules.

[0176] In one embodiment, a computer device is provided, which can be a terminal, and the internal structure diagram thereof can be as shown in Figure 7The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected by a system bus. The processor is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is configured to perform wired or wireless communication with an external terminal. The wireless communication can be achieved by WIFI, a carrier network, NFC (Near Field Communication) or other technologies. The computer program is executed by the processor to implement the areal density measurement method as described in the above embodiments. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, a trackball or a touchpad arranged on the shell of the computer device, or an external keyboard, a touchpad or a mouse, etc.

[0177] In one embodiment, a computer device is also provided, which includes a memory and a processor. The memory stores a computer program. The processor executes the computer program to implement the steps of the areal density measurement method of any one of the above embodiments.

[0178] In one embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the steps of the areal density measurement method of any one of the above embodiments.

[0179] In one embodiment, a computer program product or a computer program is provided, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium. The processor executes the computer instructions to cause the computer device to perform the steps of the areal density measurement method of any one of the above embodiments.

[0180] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, storage, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0181] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for measuring areal density, characterized in that, The areal density measurement system is used, which includes two scanning frames. One scanning frame is positioned at the location where a single-sided electrode passes, and the other scanning frame is positioned at the location where a double-sided electrode passes. The double-sided electrode is an electrode obtained by coating the single-sided electrode. The method includes: Obtain the single-sided electrode horizontal scanning result obtained by scanning the single-sided electrode with an X-ray source. The single-sided electrode horizontal scanning result includes: the scanning result of the blank area of ​​the single-sided electrode and the scanning result of the single-sided coating area of ​​the single-sided electrode. Obtain the horizontal scanning result of the double-sided electrode sheet by performing a horizontal scan on the double-sided electrode sheet using an X-ray source. The double-sided electrode sheet is an electrode sheet obtained by coating the single-sided electrode sheet. The horizontal scanning result of the double-sided electrode sheet includes: the scanning result of the double-sided coating area of ​​the double-sided electrode sheet. The areal density of the electrode is obtained by analyzing the single-sided electrode horizontal scanning results and the double-sided electrode horizontal scanning results. The single-sided electrode banner scan result is obtained by performing a banner scan on the dried single-sided electrode, and the double-sided electrode banner scan result is obtained by performing a banner scan on the dried double-sided electrode.

2. The method according to claim 1, characterized in that, The single-sided electrode banner scan result is obtained by scanning the single-sided electrode with a narrow-spot X-ray source, and the double-sided electrode banner scan result is obtained by scanning the double-sided electrode with a narrow-spot X-ray source.

3. The method according to claim 2, characterized in that, The width of the narrow beam source is smaller than the width of the tab of the electrode plate.

4. The method according to claim 2, characterized in that, The method further includes: analyzing the single-sided electrode banner scanning results and the double-sided electrode banner scanning results to obtain identification results on whether the surface of the single-sided electrode and / or the double-sided electrode is abnormal.

5. The method according to any one of claims 1 to 4, characterized in that, Includes at least one of the following: First item: The acquisition of the single-sided electrode horizontal scanning result obtained by scanning the single-sided electrode with an X-ray source includes: The first scan result is obtained by performing a horizontal scan of a single-sided electrode using an X-ray source. The first scan result is analyzed to identify the width of the blank area of ​​the single-sided electrode sheet and the width of the single-sided coating area of ​​the single-sided electrode sheet. Based on the first scan result, the width of the blank area of ​​the single-sided electrode and the width of the single-sided coating area, the horizontal scan result of the single-sided electrode is obtained; Second item: The acquisition of the horizontal scanning results of the double-sided electrode sheet obtained by performing a horizontal scan using an X-ray source includes: Obtain the second scan result obtained by performing a horizontal scan of the double-sided electrode using an X-ray source; The second scanning result is analyzed to identify the width of the blank area of ​​the double-sided electrode sheet and the width of the double-sided coating area of ​​the double-sided electrode sheet. Based on the second scanning result, the width of the blank area of ​​the double-sided electrode and the width of the double-sided coating area, the horizontal scanning result of the double-sided electrode is obtained.

6. A surface density measurement system, characterized in that, The areal density measurement system is used to implement the areal density measurement method as described in any one of claims 1 to 5. The areal density measurement system includes two scanning frames, one of which is located at the position where a single-sided electrode passes, and the other is located at the position where a double-sided electrode passes. The double-sided electrode is an electrode obtained by coating the single-sided electrode. Each scanning frame performs a horizontal scan of the blank area and the coated area of ​​the electrode passing through the scanning frame. Based on the horizontal scan results of the two scanning frames, the areal density of the electrode is measured and obtained.

7. The system according to claim 6, characterized in that, One of the scanning frames is positioned at the location passed by after the single-sided electrode is dried, and the other scanning frame is positioned at the location passed by after the double-sided electrode is dried.

8. The system according to claim 6 or 7, characterized in that, The X-ray source of the scanning frame is a narrow-spot X-ray source.

9. The system according to claim 8, characterized in that, The width of the narrow beam source is smaller than the width of the tab of the electrode plate.

10. A computer device comprising a processor and a memory, the memory storing a computer program, characterized in that, When executed by the processor, the computer program causes the processor to perform the steps of the method according to any one of claims 1 to 5.

Images