Current collector detection system and method

Abstract

A current collector detection system (100) and method. The system comprises: a light source module (110), which is arranged at an outlet of a foil rolling mill, reciprocates in a first direction, and is configured to emit first light to irradiate the surface of a target current collector, such that the target current collector receives the first light and re-emits second light on the basis of the first light, wherein the target current collector has been coated with oil, and the target current collector moves in a second direction; a photoelectric conversion module (120), which is configured to receive the second light re-emitted by the target current collector and convert the second light into a first electrical signal; and a processor, which is electrically connected to the photoelectric conversion module (120), and is configured to receive the first electrical signal, determine, on the basis of pre-calibrated correspondences between electrical signals and fluorescence intensities, a first fluorescence intensity corresponding to the first electrical signal, and determine, when the first fluorescence intensity is higher than a first preset threshold, that the oil loading amount of the target current collector exceeds a second preset threshold.

Description

Current collector detection system and method Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411120943.8, filed on August 15, 2024, entitled “Current collector detection system and method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a current collector detection system and method. BACKGROUND

[0003] The current collector of a lithium ion battery needs to be sprayed with a large amount of rolling oil during production to prevent sticking to the roller, and also serves the purposes of cleaning and cooling. The rolling oil is composed of base oil and low-alcohol high-ester complex additives, among which esters are difficult to volatilize, and oil removal processes such as annealing and cleaning can cause a small amount of rolling oil to remain on the surface of the finished current collector. If the oil content is too high, local undercoating or point-like undercoating can occur when carbon is coated on the surface of the current collector, which can further cause virtual welding of the tabs and insufficient adhesion of the active material of the prepared electrode sheet to the current collector, resulting in electrode sheet detachment, internal short circuit of the battery, and low capacity.

[0004] Therefore, there is a need for a solution that can accurately detect whether the oil content of the current collector exceeds the standard. SUMMARY

[0005] The present application provides a current collector detection system and method that can accurately detect whether the oil content of the current collector exceeds the standard.

[0006] In a first aspect, the present application provides a current collector detection system, which comprises: a light source module arranged at the outlet of a foil rolling mill, configured to emit first light along a first direction, irradiate the surface of a target current collector, so that the target current collector receives the first light and reflects second light based on the first light, the target current collector has been sprayed with oil stains, and the target current collector moves along a second direction intersecting the first direction; a photoelectric conversion module configured to receive the second light reflected by the target current collector and convert the second light into a first electrical signal; and a processor electrically connected to the photoelectric conversion module, configured to receive the first electrical signal, determine a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated correspondence between electrical signals and fluorescence intensities, and determine that the oil content of the target current collector exceeds a first preset threshold if the first fluorescence intensity is greater than a preset threshold.

[0007] Thus, when the light source module emits light to irradiate the surface of the current collector, the oil stain molecules on the surface of the current collector are excited to a high-energy state, the oil stain molecules will naturally transition to the initial state, and the remaining energy will be reflected in the form of light waves and received by the photoelectric conversion module and converted into an electrical signal. The processor can then determine the fluorescence intensity based on the electrical signal. The more oil stains, the greater the fluorescence intensity. Therefore, in the case that the first fluorescence intensity of the target current collector is greater than the first preset threshold, it can be determined that the oil carrying amount of the target current collector exceeds the second preset threshold. In this way, accurate detection of whether the oil carrying amount of the current collector exceeds the standard can be achieved.

[0008] In some embodiments, the system further comprises a positioning module electrically connected to the processor and configured to capture an image of the surface of the target current collector, and determine the irradiation position of the first light on the surface of the target current collector as the target detection position based on the image; the processor is configured to determine the target fluorescence intensity of the target detection position of the target current collector based on the target electrical signal corresponding to the target detection position, and determine that the oil carrying amount at the target detection position exceeds the second preset threshold in the case that the target fluorescence intensity is greater than the first preset threshold, the first electrical signal including the target electrical signal.

[0009] In this way, by positioning the irradiation position of the first light, the specific position of the target current collector where the oil carrying amount exceeds the second preset threshold can be determined, facilitating subsequent targeted measures for the position where the oil carrying amount exceeds the second preset threshold.

[0010] In some embodiments, the system further comprises a light filter configured to filter out light of a wavelength that does not meet a preset condition from the light irradiating the surface of the target current collector, and irradiate the first light obtained after filtering to the surface of the target current collector, the preset condition including a wavelength of a preset wavelength.

[0011] In this way, by setting the light filter, the adverse effects of interfering light on current collector detection can be avoided, thereby improving the accuracy of current collector detection.

[0012] In some embodiments, the light filter comprises a filter, and the filter parameter of the filter is determined based on the preset condition.

[0013] In this way, by determining the filter parameter based on the preset condition, a more suitable filter can be selected to more reliably avoid the adverse effects of interfering light on current collector detection.

[0014] In some embodiments, the light source module comprises an ultraviolet light source configured to emit ultraviolet light to irradiate the surface of the target current collector.

[0015] Thus, by irradiating the target current collector surface with ultraviolet light emitted by the ultraviolet light source, the oil stain molecules on the target current collector surface can be better excited to a high-energy state, and then naturally transition to an initial state, so that energy is reflected to the photoelectric conversion module in the form of light waves, thereby more reliably reflecting the oil-carrying amount of the current collector.

[0016] In a second aspect, the application provides a current collector detection method, which includes: irradiating a target current collector surface with first light to cause the target current collector to receive the first light and reflect second light based on the first light, the target current collector having been sprayed with oil stains, the target current collector moving in a second direction intersecting the first direction; receiving the second light reflected by the target current collector and converting the second light into a first electrical signal; receiving the first electrical signal, determining a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated correspondence between electrical signals and fluorescence intensities, and determining that the oil-carrying amount of the target current collector exceeds a second preset threshold if the first fluorescence intensity is greater than a first preset threshold.

[0017] Thus, when the light source module emits light to irradiate the current collector surface, the oil stain molecules on the current collector surface will be excited to a high-energy state, and the oil stain molecules will naturally transition to an initial state, and the remaining energy will be reflected in the form of light waves and received by the photoelectric conversion module and converted into an electrical signal. The processor can then determine the fluorescence intensity based on the electrical signal. The more oil stains, the greater the fluorescence intensity. Therefore, if the first fluorescence intensity of the target current collector is greater than the first preset threshold, it can be determined that the oil-carrying amount of the target current collector exceeds the second preset threshold. In this way, accurate detection of whether the oil-carrying amount of the current collector exceeds the standard can be achieved.

[0018] In some embodiments, the method further includes: capturing an image of the target current collector surface, and determining an irradiation position of the first light on the target current collector surface based on the image, the irradiation position being taken as a target detection position; determining a target fluorescence intensity of the target detection position of the target current collector based on a target electrical signal corresponding to the target detection position, and determining that the oil-carrying amount at the target detection position exceeds the second preset threshold if the target fluorescence intensity is greater than the first preset threshold, the first electrical signal including the target electrical signal.

[0019] In this way, the specific position on the target current collector where the oil-carrying amount exceeds the second preset threshold can be determined by positioning the irradiation position of the first light, facilitating subsequent targeted measures for the position where the oil-carrying amount exceeds the second preset threshold.

[0020] In some embodiments, the method further includes: outputting a warning information if the first fluorescence intensity is greater than the first preset threshold, the warning information being configured to prompt a user that the oil-carrying amount of the target current collector exceeds the second preset threshold.

[0021] Thus, by outputting the early warning information when the first fluorescence intensity of the target set fluid is greater than the first preset threshold, the user can be reminded in a timely manner to take corresponding measures for control, thereby avoiding the production of a large amount of set fluid with the oil-carrying amount exceeding the second preset threshold, and causing waste.

[0022] In some embodiments, the method further includes: in a case where the first fluorescence intensity is greater than the first preset threshold, sending first feedback information to the oil injection system, so that the oil injection system detects the temperature of the sprayed oil stain based on the first feedback information, and adjusts the temperature to be within the first preset range in a case where the temperature exceeds the first preset range, the first feedback information indicating that the oil-carrying amount of the target set fluid exceeds the second preset threshold.

[0023] Thus, by the above process, in a case where the oil-carrying amount of the target set fluid exceeds the second preset threshold, the first feedback information can be automatically sent to the oil injection system, so that the oil injection system automatically detects whether the temperature of the sprayed oil stain exceeds the first preset range, and automatically adjusts the temperature to be within the first preset range in a case where the temperature exceeds the first preset range, thereby avoiding the oil-carrying amount of subsequent set fluid still exceeding the second preset threshold, and thus avoiding the production of a large amount of set fluid with the oil-carrying amount exceeding the second preset threshold, and causing waste, without the need for manual adjustment, thereby saving labor costs.

[0024] In some embodiments, the method further includes: in a case where the first fluorescence intensity is greater than the first preset threshold, sending second feedback information to the oil injection system, so that the oil injection system determines a target oil injection nozzle with abnormal oil injection amount from the plurality of oil injection nozzles based on a first position in the second feedback information, and adjusts the oil injection amount of the target oil injection nozzle to be within a second preset range, the second feedback information indicating that the oil-carrying amount at the first position of the target set fluid exceeds the second preset threshold.

[0025] Thus, by the above process, in a case where the oil-carrying amount at the first position of the target set fluid exceeds the second preset threshold, the second feedback information can be automatically sent to the oil injection system, so that the oil injection system automatically detects the target oil injection nozzle with abnormal oil injection amount, and automatically adjusts the oil injection amount of the target oil injection nozzle to be within the second preset range, thereby avoiding the oil-carrying amount of subsequent set fluid still exceeding the second preset threshold, and thus avoiding the production of a large amount of set fluid with the oil-carrying amount exceeding the second preset threshold, causing waste, without the need for manual adjustment, thereby saving labor costs.

[0026] In some embodiments, the method further includes: in a case where the difference between the fluorescence intensity at the second position and the fluorescence intensity at the third position of the target set fluid is greater than a third preset threshold, sending third feedback information to the oil injection system, so that the oil injection system adjusts the oil injection amounts of the plurality of oil injection nozzles of the oil injection system to be target oil injection amounts based on the third feedback information, the target oil injection amounts being within a second preset range, the third feedback information indicating that the oil-carrying amount of the target set fluid is uneven.

[0027] Thus, through the above process, in the case of uneven oil content of the target collection fluid, the third feedback information can be automatically sent to the oil injection system to automatically adjust the oil injection amount of the plurality of oil injection nozzles to the same value, thereby avoiding the subsequent collection fluid still having uneven oil content, and thus avoiding the production of a large amount of collection fluid with uneven oil content, causing waste, and without the need for manual adjustment, saving labor costs.

[0028] In some embodiments, the method further comprises: in the case that the target fluorescence intensity is greater than the first preset threshold and the target detection position is located in the first preset area, sending fourth feedback information to the collection fluid slitting system to make the collection fluid slitting system cut off the first preset area in the target collection fluid based on the fourth feedback information, the first preset area including a preset head area and / or a preset tail area of the target collection fluid, and the fourth feedback information indicating that the oil content at the target detection position of the target collection fluid exceeds the second preset threshold.

[0029] Thus, through the above process, the target collection fluid can be automatically cut based on the oil content without manual cutting, reducing labor costs and improving accuracy, and avoiding excessive cutting area and waste.

[0030] In some embodiments, the method further comprises: in the case that the target fluorescence intensity is greater than the first preset threshold, sending fifth feedback information to the corona system to determine the target corona parameter corresponding to the target fluorescence intensity included in the fifth feedback information based on the pre-marked corresponding relationship between the fluorescence intensity and the corona parameter, and adjusting the corona parameter for the target detection position to the target corona parameter, the fifth feedback information indicating that the oil content at the target detection position of the target collection fluid exceeds the second preset threshold, and the fluorescence intensity at the target detection position being the target fluorescence intensity.

[0031] Thus, in the case of excessive oil content at the target detection position of the target collection fluid, the corona parameter can be automatically adjusted to reduce the oil content and avoid the target collection fluid becoming a defective product, without the need for manual adjustment, reducing labor costs and improving accuracy and timeliness.

[0032] In some embodiments, the method further comprises: obtaining the oil content and fluorescence intensity corresponding to a plurality of collection fluid samples with different cleanliness respectively; fitting the oil content and fluorescence intensity of the plurality of collection fluid samples to obtain a corresponding relationship between the oil content and the fluorescence intensity; determining the fluorescence intensity corresponding to the second preset threshold based on the corresponding relationship between the oil content and the fluorescence intensity; and determining the fluorescence intensity corresponding to the second preset threshold as the first preset threshold.

[0033] Therefore, by fitting the oil content of the plurality of current collector samples with different cleanliness and the fluorescence intensity corresponding to each of the plurality of current collector samples, the corresponding relationship between the oil content and the fluorescence intensity is obtained, and the fluorescence intensity corresponding to the second preset threshold is selected as the first preset threshold, so that the first preset threshold configured to determine whether the oil content exceeds the second preset threshold can be accurately calibrated, thereby realizing accurate detection of whether the oil content of the current collector exceeds the standard.

[0034] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are merely intended to illustrate the preferred embodiments and are not to be considered as limiting of the present application. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0036] Fig. 1 is a structural schematic diagram of a current collector detection system according to some embodiments of the present application;

[0037] Fig. 2 is a schematic diagram of the installation position of a light source module according to some embodiments of the present application;

[0038] Fig. 3 is a structural schematic diagram of a current collector detection system according to some embodiments of the present application;

[0039] Fig. 4 is a schematic diagram of the principle of current collector detection according to some embodiments of the present application;

[0040] Fig. 5 is a flowchart of a current collector detection method according to some embodiments of the present application;

[0041] Fig. 6 is a schematic diagram of a scenario for calibrating a preset threshold according to some embodiments of the present application;

[0042] Fig. 7 is a schematic diagram of the curve of oil layer thickness and fluorescence intensity according to some embodiments of the present application.

[0043] In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0044] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only configured 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.

[0045] 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 this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims, along with their derivatives, are meant to be interpreted as specifying inclusion of the referenced elements, but not exclusion of any other elements.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only configured to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0047] Reference herein to "an embodiment" 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 appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or necessarily alternatives to other embodiments. It will be explicitly and implicitly appreciated by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "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 mechanical connection, or it can be electrical connection; 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 present application can be understood according to the specific circumstances.

[0051] As the background, the aluminum foil used by the lithium ion battery positive electrode current collector is a rolled aluminum foil, and a large amount of rolling oil needs to be sprayed during production to prevent the aluminum foil from sticking to the roll, and at the same time to play a cleaning and cooling role. The rolling oil is composed of base oil and low-alcohol high-ester complex additives, among which esters are difficult to volatilize, and the oil removal processes such as annealing, cleaning and the like make the aluminum foil product surface residual a small amount of rolling oil. The aluminum foil manufacturing process determines that the surface residual oil content is unavoidable, but if the oil content is too much, local coating or point coating problems will occur when coating carbon on the surface of the aluminum foil, which will further cause the tab to be virtually welded, and the cathode active material of the tab will be insufficiently bonded to the aluminum foil, resulting in delamination, causing internal short circuit and low capacity problems, and seriously affecting the battery performance.

[0052] In the related art, the surface energy of the aluminum foil is characterized by offline testing of the da Vinci value. A da Vinci pen or da Vinci liquid is used to draw a line on the surface of the aluminum foil, and if it does not shrink, it is the da Vinci value. The lower the da Vinci value, the greater the surface energy of the aluminum foil, the more firmly the active material is bonded to the surface of the aluminum foil, and the better the coating effect.

[0053] However, the high-ester additive (6%~10%) in the rolling oil will make the da Vinci value of the aluminum foil low, but the residual oil content is high, so the aluminum foil that meets the da Vinci value specification cannot meet the requirements of no coating and no delamination in actual production. There is no reliable method to accurately detect whether the oil content of the current collector exceeds the standard, and the oil content of the current collector is in an uncontrolled state.

[0054] To solve the above technical problems, the embodiment of the present application provides a current collector detection system and method, a light source module is arranged at the outlet of the foil rolling mill, and is configured to emit first light to irradiate the surface of the target current collector, so that the target current collector receives the first light and reflects the second light based on the first light. The target current collector has been sprayed with oil stains, and the target current collector moves along a second direction intersecting the first direction; a photoelectric conversion module is configured to receive the second light reflected by the target current collector and convert the second light into a first electric signal; a processor is electrically connected with the photoelectric conversion module and is configured to receive the first electric signal, determine the first fluorescence intensity corresponding to the first electric signal based on the correspondence between the electric signal and the fluorescence intensity pre-calibrated, and determine that the oil content of the target current collector exceeds a second preset threshold value if the first fluorescence intensity is greater than a first preset threshold value.

[0055] Thus, when the light source module emits light to irradiate the surface of the current collector, the oil stain molecules on the surface of the current collector are excited to a high-energy state, the oil stain molecules will naturally transition to the initial state, and the remaining energy will be reflected in the form of light waves and received by the photoelectric conversion module and converted into an electrical signal. Then the processor can determine the fluorescence intensity based on the electrical signal. The more oil stains, the greater the fluorescence intensity. Therefore, in the case that the first fluorescence intensity of the target current collector is greater than the first preset threshold, it can be determined that the oil carrying amount of the target current collector exceeds the second preset threshold. In this way, accurate detection of whether the oil carrying amount of the current collector exceeds the standard can be realized.

[0056] The current collector detection system and method provided by the embodiments of the present application will be described in detail below.

[0057] FIG. 1 is a structural schematic diagram of a current collector detection system provided by some embodiments of the present application.

[0058] As shown in FIG. 1, the current collector detection system 100 can include a light source module 110, a photoelectric conversion module 120, and a processor 130.

[0059] The light source module 110 can be arranged at the outlet of a foil rolling mill and reciprocate along a first direction. The light source module 110 can be configured to emit first light to irradiate the surface of the target current collector, so that the target current collector receives the first light and reflects second light based on the first light. The target current collector has been sprayed with oil stains. The target current collector can move along a second direction, and the second direction can intersect the first direction.

[0060] The photoelectric conversion module 120 can be configured to receive the second light reflected by the target current collector and convert the second light into a first electrical signal.

[0061] The processor 130 can be electrically connected to the photoelectric conversion module 120 and can be configured to receive the first electrical signal, determine a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated corresponding relationship between the electrical signal and the fluorescence intensity, and determine that the oil carrying amount of the target current collector exceeds a second preset threshold in the case that the first fluorescence intensity is greater than a first preset threshold.

[0062] Here, the target current collector can be a lithium ion battery positive electrode current collector. Exemplarily, the target current collector can be an aluminum foil.

[0063] The surface of the target current collector can be the side of the target current collector that has been sprayed with oil and needs to be coated with carbon.

[0064] The first direction can be the width direction of the target current collector. The target current collector can be located on a conveying assembly, and the second direction can be the running direction of the conveying assembly. The first direction can be perpendicular to the second direction.

[0065] Exemplarily, the light source module 110 can be installed at a thickness gauge at an exit of a foil rolling mill, the distance between the light source module 110 and the surface of the aluminum foil can be adjusted, for example, to be 4.7 mm. The light source module 110 can move back and forth in the width direction of the aluminum foil perpendicular to the running direction, so as to detect whether the oil content of the entire width range of the aluminum foil exceeds the standard.

[0066] Exemplarily, the trajectory of the first light on the surface of the target current collector can be Z-shaped, wave-shaped and / or diagonal. The light source module 110 can move back and forth in the width direction of the aluminum foil perpendicular to the running direction, so as to form a Z-shaped, wave-shaped and / or diagonal trajectory. Among them, the Z-shaped trajectory has a long detection path and a larger detection range, which can more comprehensively and accurately detect whether the oil content of the current collector exceeds the standard, and is suitable for scenes with stricter monitoring of oil content; the wave-shaped and diagonal trajectories have smaller detection ranges and higher detection efficiencies, and are suitable for scenes with higher efficiency requirements.

[0067] Exemplarily, the installation position of the light source module 110 can be as shown in FIG. 2.

[0068] The photoelectric conversion module 120 can be a photodiode, which can convert the received light signal (i.e., the second light) into an electrical signal. The electrical signal can include a current signal and / or a voltage signal.

[0069] The photoelectric conversion module 120 can send the first electrical signal to the processor 130, and then the processor 130 can determine the first fluorescence intensity of the target current collector based on the first electrical signal, and determine that the oil content of the target current collector exceeds the second preset threshold value when the first fluorescence intensity is greater than the first preset threshold value.

[0070] The processor 130 can be an upper computer or a microcontroller unit (MCU).

[0071] Specifically, the processor 130 can pre-acquire electrical signals corresponding to a plurality of current collector samples and fluorescence intensities corresponding to the electrical signals, respectively, fit the fluorescence intensities corresponding to the plurality of electrical signals, respectively, to obtain a corresponding relationship between the electrical signals and the fluorescence intensities, and save the corresponding relationship between the electrical signals and the fluorescence intensities. Then, when detecting the current collector, the first fluorescence intensity corresponding to the received first electrical signal can be determined based on the corresponding relationship between the electrical signals and the fluorescence intensities.

[0072] The processor 130 can also display the first fluorescence intensity of the target current collector.

[0073] The fluorescence intensity can be a relative fluorescence unit (RFU) value.

[0074] The fluorescence intensity can be positively correlated with the oil content.

[0075] If the first fluorescence intensity is greater than the first preset threshold, it can be determined that the oil content of the target fluid exceeds the second preset threshold; if the first fluorescence intensity is less than or equal to the first preset threshold, it can be determined that the oil content of the target fluid does not exceed the second preset threshold.

[0076] The first preset threshold can be set according to actual needs. For example, the first preset threshold can be pre-calibrated.

[0077] The second preset threshold can be set according to actual needs.

[0078] Exemplarily, the first preset threshold can be 10 RFU. If the first fluorescence intensity is greater than 10 RFU, it can be determined that the oil content of the target fluid exceeds the second preset threshold; if the first fluorescence intensity is less than or equal to 10 RFU, it can be determined that the oil content of the target fluid does not exceed the second preset threshold.

[0079] In some embodiments of the present application, the light source module 110 can include an ultraviolet ray (UV) light source.

[0080] The UV light source can reciprocate along the first direction and can be configured to emit UV light rays to irradiate the surface of the target fluid.

[0081] Here, short-wave UV light rays can be used to irradiate the surface of the target fluid.

[0082] Exemplarily, the UV light source can emit UV light rays with a wavelength of 360 nm to irradiate the surface of the aluminum foil.

[0083] In this way, by using the UV light source to emit UV light rays to irradiate the surface of the target fluid, the oil molecules on the surface of the target fluid can be better excited to a high-energy state, and the oil molecules will naturally transition to an initial state to reflect energy in the form of light waves to the photoelectric conversion module, so that the oil content of the fluid can be more reliably reflected.

[0084] Therefore, when the light source module emits light rays to irradiate the surface of the fluid, the oil molecules on the surface of the fluid will be excited to a high-energy state, and the oil molecules will naturally transition to an initial state, and the remaining energy will be reflected in the form of light waves and received by the photoelectric conversion module and converted into an electrical signal. Then, the processor can determine the fluorescence intensity based on the electrical signal. The more oil, the greater the fluorescence intensity. Therefore, in the case where the first fluorescence intensity of the target fluid is greater than the first preset threshold, it can be determined that the oil content of the target fluid exceeds the second preset threshold. In this way, accurate detection of whether the oil content of the fluid exceeds the standard can be achieved.

[0085] In the related art, the surface energy of the aluminum foil is represented by the off-line test of the da Vinci value. However, this method has deviated from the standard requirement of the aluminum foil oil content in the actual production process, and belongs to off-line detection, which has a lag. The aluminum foil surface oil content is not controlled. When abnormal fluctuations occur in the production process, such as excessive and uneven spraying of rolling oil, it cannot be identified in time. When the downstream finds out, a large amount of products with excessive oil content have been produced, which flows into the downstream and causes great risk, and also causes great cost loss.

[0086] The current collector detection system provided by the embodiments of the present application can realize online detection of whether the current collector oil content is excessive. When the current collector oil content is excessive, it can be found in time to avoid producing a large amount of defective products, flowing into the downstream and causing great risk, and also avoiding cost loss. Moreover, the current collector detection system provided by the embodiments of the present application is simple to install, belongs to non-contact and non-destructive measurement, can achieve the purpose of online quantitative monitoring, and improves the oil content detection capability.

[0087] In some embodiments of the present application, as shown in FIG. 1, the current collector detection system 100 can further include a positioning module 140.

[0088] The positioning module 140 can be electrically connected with the processor 130, and can be configured to collect an image of a target current collector surface, and determine a first light irradiation position on the target current collector surface based on the image, and take the irradiation position as a target detection position.

[0089] The processor 130 can be configured to determine a target fluorescence intensity of the target detection position of the target current collector based on a target electrical signal corresponding to the target detection position, and determine that the oil content at the target detection position exceeds a second preset threshold value when the target fluorescence intensity is greater than a first preset threshold value.

[0090] Here, the positioning module 140 can include a camera and a positioning unit. The camera can be electrically connected with the positioning unit. The camera can be configured to collect an image of a target current collector surface. When the first light irradiates to the surface of the target current collector, the irradiation position of the first light can be displayed in the image collected by the camera. After the camera sends the image to the positioning unit, the positioning unit can determine the irradiation position of the first light on the surface of the target current collector based on the image, and take the irradiation position as the target detection position.

[0091] The target detection position can be the irradiation position of the first light on the surface of the target current collector. The first light can irradiate to any position on the surface of the target current collector. Illustratively, the target detection position can be the coordinates of the irradiation position of the first light on the surface of the target current collector.

[0092] Illustratively, the light irradiation position in the image can be detected by a target detection model to determine the target detection position.

[0093] The processor 130 can determine the target fluorescence intensity corresponding to the target detection position of the target fluid collection body based on the target electrical signal corresponding to the target detection position. The first electrical signal can include the target electrical signal. The first electrical signal can include a plurality of electrical signals, and the target electrical signal can be one of the plurality of electrical signals.

[0094] The target electrical signal can also be multiple. The processor 130 can determine the target fluorescence intensity corresponding to the plurality of target detection positions of the target fluid collection body based on the target electrical signal corresponding to each of the plurality of target detection positions.

[0095] The processor 130 can also display the target fluorescence intensity at the plurality of target detection positions of the target fluid collection body.

[0096] Exemplarily, the target fluorescence intensity at the plurality of target detection positions of the target fluid collection body can be displayed by an image, wherein the abscissa can be the coordinate of the target detection position in the width direction of the target fluid collection body, the ordinate can be the coordinate of the target detection position in the length direction of the target fluid collection body, and the target fluorescence intensity at different target detection positions can be represented by different colors.

[0097] In this way, the specific position of the target fluid collection body where the oil-carrying amount exceeds the second preset threshold can be determined by positioning the illumination position of the first light, so that subsequent corresponding measures can be taken for the position where the oil-carrying amount exceeds the second preset threshold.

[0098] In some embodiments of the present application, as shown in FIG. 3, the fluid collection body detection system 100 can further include a light filter 150.

[0099] The light filter 150 can be configured to filter out light having a wavelength that does not meet a preset condition from the light irradiated to the surface of the target fluid collection body, and irradiate the filtered first light to the surface of the target fluid collection body.

[0100] Here, the light irradiated to the surface of the target fluid collection body can include not only the first light emitted by the light source module, but also other light, such as natural light and / or light emitted by other light sources. Irradiation of other light to the surface of the target fluid collection body can interfere with the detection of the fluid collection body. Therefore, in order to avoid interference with the detection of the fluid collection body, the interfering light can be filtered out from the light irradiated to the surface of the target fluid collection body.

[0101] Specifically, the first light and the interfering light can be distinguished by wavelength. The preset condition can include a wavelength being a preset wavelength, and the preset wavelength can be the wavelength of the first light emitted by the light source module.

[0102] Exemplarily, the wavelength of the first light emitted by the light source module is 360 nm, and the light filter 150 can filter out light with a wavelength other than 360 nm from the light irradiated to the target current collector surface, so that the first light with a wavelength of 360 nm can be obtained and irradiated to the target current collector surface.

[0103] In addition, the light filter 150 can also be configured to reflect the second light reflected by the target current collector surface to the photoelectric conversion module 120.

[0104] In this way, by arranging the light filter, the adverse effects of interfering light on the current collector detection can be avoided, and the accuracy of the current collector detection can be improved.

[0105] In some embodiments of the present application, the light filter 150 can include a light filter.

[0106] The light filtering parameter of the light filter can be determined based on a preset condition.

[0107] Here, the light filtering parameter can refer to the wavelength of the light that can be filtered out by the light filter or the wavelength of the light that can be retained.

[0108] Exemplarily, the wavelength of the light that can be filtered out by the light filter can be greater than or less than 360 nm, and the wavelength of the light that can be retained by the light filter can be equal to 360 nm.

[0109] In this way, by determining the light filtering parameter based on the preset condition, a more suitable light filter can be selected, and the adverse effects of interfering light on the current collector detection can be more reliably avoided.

[0110] In some examples, the principle of the current collector detection system can be as shown in FIG. 4. The UV light source emits UV light, the UV light irradiates to the target current collector surface after passing through the light filter, and the light reflected by the target current collector surface is reflected to the photodiode through the light filter. If the oil film of the target current collector surface is thick (i.e., the oil amount exceeds the preset oil amount threshold), the fluorescence intensity reflected to the photodiode is strong (i.e., the fluorescence intensity is large); if the oil film of the target current collector surface is thin (i.e., the oil amount does not exceed the preset oil amount threshold), the fluorescence reflected to the photodiode is weak (i.e., the fluorescence intensity is small).

[0111] In some examples, the measurement range of the current collector detection system can be 0-2000 RFU, the excitation wavelength can be 360-365 nm, the maximum power can be 150 mW, and the measurement distance can be 4.7 mm.

[0112] The current collector detection system provided by the embodiments of the present application can not only realize online detection, but also can realize portable offline detection, and can be integrated in an automatic detection box test bench.

[0113] The application further provides a current collector detection method. The execution subject of the current collector detection method can be the current collector detection system shown in any of the above embodiments.

[0114] FIG. 5 is a flowchart of a current collector detection method according to some embodiments of the application.

[0115] As shown in FIG. 5, the current collector detection method can include the following steps:

[0116] S510, emitting a first light to irradiate a surface of a target current collector, so that the target current collector receives the first light and reflects a second light based on the first light;

[0117] S520, receiving the second light reflected by the target current collector, and converting the second light into a first electrical signal;

[0118] S530, receiving the first electrical signal, determining a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated corresponding relationship between electrical signals and fluorescence intensities, and determining that an oil amount of the target current collector exceeds a second preset threshold value when the first fluorescence intensity is greater than a first preset threshold value.

[0119] The target current collector can have been sprayed with oil stains.

[0120] The specific process of S510-S530 can refer to the above embodiments, which will not be described here.

[0121] Therefore, when the light source module emits light to irradiate the surface of the current collector, the oil molecules on the surface of the current collector will be excited to a high-energy state, and the oil molecules will naturally transition to an initial state, and the remaining energy will be reflected in the form of light waves and received by the photoelectric conversion module and converted into an electrical signal. Then, the processor can determine the fluorescence intensity based on the electrical signal. The more oil, the greater the fluorescence intensity. Therefore, when the first fluorescence intensity of the target current collector is greater than the first preset threshold value, it can be determined that the oil amount of the target current collector exceeds the second preset threshold value. In this way, accurate detection of whether the oil amount of the current collector exceeds the standard can be achieved.

[0122] In some embodiments of the application, the method can further include:

[0123] collecting an image of the surface of the target current collector, and determining an irradiation position of the first light on the surface of the target current collector based on the image, the irradiation position being taken as a target detection position;

[0124] determine a target fluorescence intensity of the target detection position of the target current collector based on the target electric signal corresponding to the target detection position, and determine that the oil-carrying amount at the target detection position exceeds the second preset threshold if the target fluorescence intensity is greater than a first preset threshold, the first electric signal including the target electric signal.

[0125] Here, the specific process can refer to the above embodiments, which will not be repeated here.

[0126] In this way, the specific position of the target current collector where the oil-carrying amount exceeds the second preset threshold can be determined by positioning the illumination position of the first light, and subsequent measures can be taken to the position where the oil-carrying amount exceeds the second preset threshold.

[0127] In some embodiments of the present application, after determining the first fluorescence intensity corresponding to the first electric signal based on the correspondence between the pre-calibrated electric signal and the fluorescence intensity, the method can further include:

[0128] Outputting a warning information if the first fluorescence intensity is greater than a first preset threshold.

[0129] Here, the warning information can be configured to prompt the user that the oil-carrying amount of the target current collector exceeds the second preset threshold.

[0130] Specifically, the first fluorescence intensity of the target current collector being greater than the first preset threshold can represent that the oil-carrying amount of the target current collector exceeds the second preset threshold, and therefore the warning information can be outputted to prompt the user that the oil-carrying amount of the target current collector exceeds the second preset threshold, so that the user can take appropriate measures for control. For example, the user can adjust the oil injection parameters of the oil injection system to avoid subsequent current collectors with oil-carrying amount exceeding the second preset threshold.

[0131] Exemplarily, the output mode of the warning information can include at least one of text, pattern, sound and vibration.

[0132] In this way, by outputting the warning information if the first fluorescence intensity of the target current collector is greater than the first preset threshold, the user can be reminded to take appropriate measures for control in a timely manner, avoiding the production of a large number of current collectors with oil-carrying amount exceeding the second preset threshold, causing waste.

[0133] In some embodiments of the present application, after determining the first fluorescence intensity corresponding to the first electric signal based on the correspondence between the pre-calibrated electric signal and the fluorescence intensity, the method can further include:

[0134] Sending first feedback information to the oil injection system to make the oil injection system detect the temperature of the sprayed oil stain based on the first feedback information, and adjusting the temperature to be within a first preset range if the temperature exceeds the first preset range.

[0135] Here, the first feedback information can represent that the oil-carrying amount of the target set fluid exceeds the second preset threshold.

[0136] The cause of the oil-carrying amount of the target set fluid exceeding the second preset threshold can include that the temperature of the oil sprayed by the oil injection system is too high.

[0137] Specifically, the first fluorescence intensity of the target set fluid being greater than the first preset threshold can represent that the oil-carrying amount of the target set fluid exceeds the second preset threshold, and therefore the first feedback information can be automatically sent to the oil injection system to enable the oil injection system to automatically detect the temperature of the oil sprayed by itself, determine whether the temperature exceeds the preset range, and if so, adjust the temperature to be within the first preset range to reduce the oil-carrying amount of the target set fluid, and if not, not adjust the temperature.

[0138] Exemplarily, the first feedback information can be sent to a rolling mill main cabin machine controller in the oil injection system.

[0139] The first preset range can be set according to actual needs, and specifically, set fluid carrying oil of different temperatures can be pre-detected for oil-carrying amount, and the temperature range corresponding to the set fluid with an oil-carrying amount not exceeding the second preset threshold can be taken as the first preset range. Exemplarily, the first preset range can be 30-45°C.

[0140] In this way, through the above process, in the case that the oil-carrying amount of the target set fluid exceeds the second preset threshold, the first feedback information can be automatically sent to the oil injection system to enable the oil injection system to automatically detect whether the temperature of the sprayed oil exceeds the first preset range, and in the case that the temperature exceeds the first preset range, automatically adjust the temperature to be within the first preset range, so as to avoid the oil-carrying amount of the subsequent set fluid still exceeding the second preset threshold, thereby avoiding the production of a large amount of set fluid with an oil-carrying amount exceeding the second preset threshold, causing waste, and saving labor costs without manual adjustment.

[0141] In some embodiments of the present application, after determining the first fluorescence intensity corresponding to the first electric signal based on the correspondence between the pre-calibrated electric signal and the fluorescence intensity, the method can further include:

[0142] In the case that the first fluorescence intensity is greater than the first preset threshold, the second feedback information is sent to the oil injection system to enable the oil injection system to determine, based on the first position in the second feedback information, a target oil injection nozzle with abnormal oil injection amount from the plurality of oil injection nozzles, and adjust the oil injection amount of the target oil injection nozzle to be within the second preset range.

[0143] Here, the second feedback information can represent that the oil-carrying amount at the first position of the target set fluid exceeds the second preset threshold.

[0144] The first position can be a position where the oil-carrying amount of the target set fluid exceeds a second preset threshold.

[0145] The cause of the oil-carrying amount at the first position exceeding the second preset threshold can include an abnormal oil injection amount of an oil injection nozzle that sprays oil stains at the first position.

[0146] Therefore, the target oil injection nozzle with an abnormal oil injection amount can be determined based on the first position, and then the oil injection amount of the target oil injection nozzle is adjusted to be within a normal oil injection amount range.

[0147] The second preset range can be a normal oil injection amount range, which can be set according to actual needs.

[0148] Specifically, the set fluid can be sprayed with oil injection nozzles with different oil injection amounts in advance, and the oil injection amount range corresponding to the set fluid with an oil-carrying amount not exceeding the second preset threshold can be used as the second preset range. For example, the second preset range can be 1000 cm3 / min to 1500 cm3 / min.

[0149] In some examples, when the temperature of the oil stain is 30°C to 45°C, the correspondence between the RFU value and the cleanliness of the set fluid and the oil injection amount range can be as shown in Table 1.

[0150] Table 1 - Oil injection amount data table

[0151] In this way, through the above process, when the oil-carrying amount at the first position of the target set fluid exceeds the second preset threshold, the second feedback information can be automatically sent to the oil injection system to enable the oil injection system to automatically detect the target oil injection nozzle with an abnormal oil injection amount and automatically adjust the oil injection amount of the target oil injection nozzle to be within the second preset range. This avoids the oil-carrying amount of subsequent set fluids still exceeding the second preset threshold, thereby avoiding the production of a large number of set fluids with an oil-carrying amount exceeding the second preset threshold, causing waste, and saving labor costs without manual adjustment.

[0152] In some embodiments of the present application, after determining the first fluorescence intensity corresponding to the first electrical signal based on the correspondence between the pre-calibrated electrical signal and the fluorescence intensity, the method can further include:

[0153] When the difference between the fluorescence intensity at the second position and the fluorescence intensity at the third position of the target set fluid is greater than a third preset threshold, third feedback information is sent to the oil injection system to enable the oil injection system to adjust the oil injection amount of each of the plurality of oil injection nozzles of the oil injection system to a target oil injection amount based on the third feedback information.

[0154] Here, the third feedback information can represent that the oil-carrying amount of the target set fluid is uneven.

[0155] The second position can be any position on the target collection fluid, and the third position can be any position on the target collection fluid except the second position.

[0156] The third preset threshold value can be set according to actual needs.

[0157] If the difference between the fluorescence intensity at the second position and the fluorescence intensity at the third position is greater than the third preset threshold value, it can be indicated that the oil-carrying amount at the second position of the target collection fluid is significantly different from the oil-carrying amount at the third position, and the oil-carrying amount of the target collection fluid is uneven.

[0158] The cause of the uneven oil-carrying amount of the target collection fluid can include inconsistent or significantly different oil injection amounts of the plurality of oil injection nozzles of the oil injection system.

[0159] Therefore, the problem of uneven oil-carrying amount of the target collection fluid can be solved by adjusting the oil injection amounts of the plurality of oil injection nozzles of the oil injection system to the target oil injection amount. The target oil injection amount can be within the second preset range.

[0160] In this way, through the above process, in the case that the oil-carrying amount of the target collection fluid is uneven, third feedback information can be automatically sent to the oil injection system to automatically adjust the oil injection amounts of the plurality of oil injection nozzles to the same value, so as to avoid the oil-carrying amount of the subsequent collection fluid being still uneven, thereby avoiding a large amount of collection fluid with uneven oil-carrying amount being produced, causing waste, and saving labor costs without manual adjustment.

[0161] In some embodiments of the present application, after determining the target fluorescence intensity of the target detection position of the target collection fluid based on the target electrical signal corresponding to the target detection position, the method can further include:

[0162] In the case that the target fluorescence intensity is greater than the first preset threshold value and the target detection position is located in the first preset area, fourth feedback information is sent to the collection fluid slitting system, so that the collection fluid slitting system cuts off the first preset area in the target collection fluid based on the fourth feedback information.

[0163] Here, the first preset area can include a preset head area and / or a preset tail area of the target collection fluid. The fourth feedback information can indicate that the oil-carrying amount at the target detection position of the target collection fluid exceeds the second preset threshold value.

[0164] Specifically, if the oil-carrying amount of the preset head area and the preset tail area exceeds the second preset threshold value, the preset head area and the preset tail area can be directly cut off. Therefore, if the target detection position whose target fluorescence intensity is greater than the first preset threshold value is located in the preset head area and / or the preset tail area, the fourth feedback information can be sent to the collection fluid slitting system to make the collection fluid slitting system cut off the preset head area and / or the preset tail area in the target collection fluid.

[0165] The preset head region and the preset tail region can be set according to actual needs, and specifically, the preset head region and the preset tail region can be determined based on a length that needs to be reserved by the target current collector.

[0166] The slitting system can be configured to perform a slitting process, and the slitting process can be a process of roughly cutting the current collector. For example, the slitting system can slit a 30000m*1.5m large roll of current collector into four 15000m*(600-750)mm small rolls of current collector, the preset head region of the small roll of current collector can be a region of 100m in the length direction of the head, and the preset tail region can be a region of 100m in the length direction of the tail. If the oil content of the 100m head region of the small roll of current collector exceeds the standard, the slitting system can cut off the 100m head region. If the oil content of the 100m tail region of the small roll of current collector exceeds the standard, the slitting system can cut off the 100m tail region.

[0167] In this way, through the above process, the target current collector can be automatically slitted based on the oil content, without manual slitting, reducing labor costs, and having high accuracy, avoiding excessive cutting of the region and causing waste.

[0168] In some embodiments of the present application, after determining the target fluorescence intensity of the target detection position of the target current collector based on the target electrical signal corresponding to the target detection position, the method can further include:

[0169] In the case where the target fluorescence intensity is greater than the first preset threshold, the fifth feedback information is sent to the corona system, so that the corona system determines the target corona parameter corresponding to the target fluorescence intensity included in the fifth feedback information based on the pre-calibrated corresponding relationship between the fluorescence intensity and the corona parameter, and adjusts the corona parameter for the target detection position to the target corona parameter.

[0170] Here, the fifth feedback information can represent that the oil content at the target detection position of the target current collector exceeds the second preset threshold, and the fluorescence intensity at the target detection position is the target fluorescence intensity.

[0171] The corona can polarize the oil stains on the surface of the current collector, break and volatilize the oil molecules, so that the adhesion of the surface of the current collector can be greatly improved.

[0172] Therefore, for the target detection position with oil content exceeding the second preset threshold, the oil content can be reduced by corona.

[0173] The specific corona parameter at the target detection position, i.e., the target corona parameter, can be determined based on the target fluorescence intensity.

[0174] Specifically, the corresponding relationship between the fluorescence intensity and the corona parameter can be obtained by fitting the plurality of fluorescence intensities and their respective corresponding corona parameters in advance, wherein the corona parameter corresponding to the fluorescence intensity can refer to that the current collector needs to adopt the corona parameter corresponding to the fluorescence intensity to make the current collector have an oil carrying amount not exceeding the second preset threshold value.

[0175] The corona parameter can include at least one of a corona frequency, a corona power, a corona speed, a corona voltage characteristic, and a corona voltage value. Exemplarily, the corona frequency can be twice, the corona power can be 50kW-60kW, the corona speed can be 90m / min-120m / min, the corona voltage characteristic can be high-frequency alternating current, and the corona voltage value can be 5000V / m2-15000V / m2.

[0176] In this way, in the case that the target detection position of the target current collector has excessive oil carrying amount, the oil carrying amount can be reduced by automatically adjusting the corona parameter, the target current collector can be avoided from becoming a defective product, and manual adjustment is not required, thereby reducing labor cost and improving accuracy and timeliness.

[0177] In some embodiments of the present application, in the case that the target fluorescence intensity is greater than the first preset threshold value and the target detection position is located in the second preset area, fifth feedback information is sent to the corona system, so that the corona system determines the target corona parameter corresponding to the target fluorescence intensity included in the fifth feedback information based on the corresponding relationship between the fluorescence intensity and the corona parameter calibrated in advance, and adjusts the corona parameter for the target detection position to the target corona parameter.

[0178] The second preset area can be an area reserved after the target current collector passes through the fine cutting process. The second preset area can be an area that cannot be cut.

[0179] Here, the fine cutting process can be after the slitting process. The fine cutting process can be fine cutting of the current collector small roll obtained by slitting, so that the length and width of the current collector meet the requirements of the finished product size, and the end face of the current collector is free of burrs and aluminum powder, the plate shape is good, and the oil carrying amount meets the specification requirements.

[0180] The target fluorescence intensity being greater than the first preset threshold value and the target detection position being located in the second preset area can represent that there is still a position with excessive oil carrying amount in the target current collector reserved after the fine cutting process, i.e., the target detection position. Since the area reserved after the fine cutting process cannot be cut, the oil carrying amount at the target detection position can be reduced by corona. The determination method of the corona parameter can refer to the above embodiments.

[0181] The corona can be performed during the fine cutting process.

[0182] In this way, in the case that the target current collector has excessive oil in the area that cannot be removed, the oil amount can be reduced by automatically adjusting the corona parameters, the target current collector can be avoided from becoming a defective product, and manual adjustment is not required, labor cost is reduced, and accuracy and timeliness are improved.

[0183] In some embodiments of the present application, before S530, the method can further include:

[0184] Obtaining the oil amount and the fluorescence intensity corresponding to each of the plurality of current collector samples with different cleanliness;

[0185] Fitting the oil amount and the fluorescence intensity of the plurality of current collector samples to obtain a corresponding relationship between the oil amount and the fluorescence intensity;

[0186] Determining the fluorescence intensity corresponding to the second preset threshold value based on the corresponding relationship between the oil amount and the fluorescence intensity;

[0187] Determining the fluorescence intensity corresponding to the second preset threshold value as the first preset threshold value.

[0188] Here, the cleanliness of the current collector sample can be positively correlated with the carbon coating effect, and the cleanliness can be negatively correlated with the oil amount. The carbon coating effect can include normal carbon coating and missed coating.

[0189] Exemplarily, the cleanliness of the current collector sample can be represented by a percentage. The oil amount can be represented by the oil layer thickness. The second preset threshold value can be a preset oil layer thickness threshold value.

[0190] Exemplarily, as shown in FIG. 6, aluminum foils with cleanliness of 80%, 85%, 90%, 95%, and 100% can be collected, a sample can be cut in the middle area of each aluminum foil with a knife, it is noted that the surface of the sample should not be contaminated, the surface of the aluminum foil should be kept flat, the light source module can be placed vertically at a distance of 4.7 mm from the aluminum foil for detection, and the fluorescence intensity can be recorded. Here, the distance between the light source module and the aluminum foil can be consistent with the distance between the light source module and the target current collector in the current collector detection.

[0191] Through the above process, the fluorescence intensity corresponding to each of the plurality of aluminum foils with different cleanliness can be obtained, in addition, the oil amount corresponding to each of the plurality of aluminum foils with different cleanliness can be obtained, the oil amount and the fluorescence intensity corresponding to the same aluminum foil are associated and recorded, and then the plurality of oil amounts and the fluorescence intensities corresponding thereto can be fitted to obtain the corresponding relationship between the oil amount and the fluorescence intensity.

[0192] Exemplarily, the corresponding relationship between the oil amount and the fluorescence intensity can be a curve, a formula, or a table. The corresponding relationship between the oil layer thickness and the fluorescence intensity can be as shown in FIG. 7.

[0193] Then, the fluorescence intensity corresponding to the second preset threshold value can be found from the correspondence between the oil content and the fluorescence intensity, and the fluorescence intensity corresponding to the second preset threshold value is taken as the first preset threshold value. The oil content exceeding the second preset threshold value will cause the carbon coating to be missed, and the oil content not exceeding the second preset threshold value will not cause the carbon coating to be missed.

[0194] Exemplarily, the first preset threshold value can be 10 RFU. The fluorescence intensity corresponding to the second preset threshold value is less than or equal to 10 RFU, so the oil content of the current collector with the fluorescence intensity less than or equal to 10 RFU does not exceed the second preset threshold value; the fluorescence intensity corresponding to the oil content exceeding the second preset threshold value is greater than 10 RFU, so the oil content of the current collector with the fluorescence intensity greater than 10 RFU exceeds the second preset threshold value.

[0195] In this way, by fitting the oil content of the current collector samples with different cleanliness and the fluorescence intensity corresponding to the oil content respectively, the correspondence between the oil content and the fluorescence intensity is obtained, and the fluorescence intensity corresponding to the second preset threshold value is selected as the first preset threshold value, so that the first preset threshold value configured to determine whether the oil content exceeds the second preset threshold value can be accurately calibrated, thereby realizing accurate detection of whether the oil content of the current collector exceeds the standard.

[0196] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and the components thereof can be replaced with equivalents, especially, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A current collector detection system, comprising: a light source module (110) disposed at an outlet of a foil rolling machine, reciprocating along a first direction, configured to emit a first light to irradiate a surface of a target current collector, so that the target current collector receives the first light and reflects a second light based on the first light, the target current collector having been sprayed with oil, the target current collector moving along a second direction intersecting the first direction; a photoelectric conversion module (120) configured to receive the second light reflected by the target current collector and convert the second light into a first electrical signal; a processor electrically connected with the photoelectric conversion module (120), configured to receive the first electrical signal, determine a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated correspondence between electrical signals and fluorescence intensities, and determine that an oil carrying amount of the target current collector exceeds a second preset threshold value if the first fluorescence intensity is greater than a first preset threshold value.

2. The system of claim 1, wherein, The system further comprises: a positioning module (140) electrically connected with the processor, configured to acquire an image of a surface of a target current collector and determine an irradiation position of the first light on the surface of the target current collector based on the image, and take the irradiation position as a target detection position; the processor is configured to determine a target fluorescence intensity of the target detection position of the target current collector based on a target electrical signal corresponding to the target detection position, and determine that an oil carrying amount at the target detection position exceeds the second preset threshold value if the target fluorescence intensity is greater than the first preset threshold value, the first electrical signal including the target electrical signal.

3. The system of claim 2, wherein, The positioning module (140) comprises a camera and a positioning unit, the camera is electrically connected with the positioning unit, the camera is configured to acquire an image of the surface of the target current collector, when the first light irradiates to the surface of the target current collector, the irradiation position of the first light is displayed in the image acquired by the camera, after the camera sends the image to the positioning unit, the positioning unit is configured to determine the irradiation position of the first light on the surface of the target current collector based on the image, and take the irradiation position as the target detection position.

4. The system of claim 2 or 3, wherein, The processor is further configured to display target fluorescence intensities at a plurality of target detection positions of the target current collector; wherein the target fluorescence intensities at the plurality of target detection positions of the target current collector are displayed through an image, an abscissa in the image is a coordinate of the target detection position in a width direction of the target current collector, an ordinate in the image is a coordinate of the target detection position in a length direction of the target current collector, and target fluorescence intensities at different target detection positions are represented by different colors.

5. The system of claim 1, wherein, The system further comprises: a light filter configured to filter out light having a wavelength not satisfying a preset condition from light irradiating to the surface of the target current collector, and irradiate the first light obtained after filtering to the surface of the target current collector, the preset condition including a preset wavelength.

6. The system of claim 5, wherein, The light filter is further configured to reflect the second light reflected by the surface of the target current collector to the photoelectric conversion module (120).

7. The system of claim 5, wherein, The light filter comprises: The light filter comprises:

8. The system of claim 1, wherein, The light filter comprises: The light source module (110) comprises:

9. The system of claim 1, wherein, The ultraviolet light source is configured to emit ultraviolet light to irradiate the surface of the target current collector.

10. The system of claim 1, wherein, The target current collector is a positive electrode current collector of a lithium ion battery, and the surface of the target current collector is a side of the target current collector that has been sprayed with oil and needs to be coated with carbon.

11. The system of claim 1, wherein, The first direction is the width direction of the target current collector, and the target current collector is located on a conveying assembly, and the second direction is the running direction of the conveying assembly. The measurement range of the current collector detection system is 0-2000 RFU, the excitation wavelength is 360-365 nm, the maximum power is 150 mW, and the measurement distance is 4.7 mm.

12. A current collector detection method, the method comprising: Irradiating the surface of the target current collector with the first light to cause the target current collector to receive the first light and reflect the second light based on the first light, the target current collector having been sprayed with oil; Receiving the second light reflected by the target current collector and converting the second light into a first electrical signal; 13. The method of claim 12, wherein, Receiving the first electrical signal, determining a first fluorescence intensity corresponding to the first electrical signal based on a pre-calibrated correspondence between electrical signals and fluorescence intensities, and determining that the oil carrying amount of the target current collector exceeds a second preset threshold if the first fluorescence intensity is greater than a first preset threshold. The method further comprises: Collecting an image of the surface of the target current collector and determining an irradiation position of the first light on the surface of the target current collector based on the image, and taking the irradiation position as a target detection position; 14. The method of claim 12, wherein, Determining a target fluorescence intensity of the target detection position of the target current collector based on a target electrical signal corresponding to the target detection position, and determining that the oil carrying amount at the target detection position exceeds the second preset threshold if the target fluorescence intensity is greater than the first preset threshold, the first electrical signal comprising the target electrical signal. The method further comprises:

15. The method of claim 12, wherein, In the case where the first fluorescence intensity is greater than the first preset threshold, outputting a warning information, the warning information being configured to prompt a user that the oil carrying amount of the target current collector exceeds the second preset threshold. The method further comprises:

16. The method of claim 12, wherein, In the case where the first fluorescence intensity is greater than the first preset threshold, sending first feedback information to an oil spraying system to cause the oil spraying system to detect the temperature of the sprayed oil based on the first feedback information, and adjusting the temperature to be within a first preset range if the temperature exceeds the first preset range, the first feedback information indicating that the oil carrying amount of the target current collector exceeds the second preset threshold. The method further comprises: In a case where the first fluorescence intensity is greater than the first preset threshold, second feedback information is sent to the fuel injection system, so that the fuel injection system determines a target fuel injection nozzle with abnormal fuel injection amount from the plurality of fuel injection nozzles based on a first position in the second feedback information, adjusts the fuel injection amount of the target fuel injection nozzle to be within a second preset range, and the second feedback information represents that the oil carrying amount at the first position of the target header exceeds the second preset threshold.

17. The method of claim 12, wherein, The method further comprises: In a case where the difference between the fluorescence intensity at the second position and the fluorescence intensity at the third position of the target header is greater than a third preset threshold, third feedback information is sent to the fuel injection system, so that the fuel injection system adjusts the fuel injection amount of the plurality of fuel injection nozzles of the fuel injection system to a target fuel injection amount based on the third feedback information, and the target fuel injection amount is within a second preset range, and the third feedback information represents that the oil carrying amount of the target header is uneven.

18. The method of claim 13, wherein, The method further comprises: In a case where the target fluorescence intensity is greater than the first preset threshold and the target detection position is located within a first preset area, fourth feedback information is sent to the header cutting system, so that the header cutting system cuts off a first preset area in the target header based on the fourth feedback information, the first preset area includes a preset head area and / or a preset tail area of the target header, and the fourth feedback information represents that the oil carrying amount at the target detection position of the target header exceeds the second preset threshold.

19. The method of claim 12, wherein, The method further comprises: In a case where the target fluorescence intensity is greater than the first preset threshold, fifth feedback information is sent to the corona system, so that the corona system determines a target corona parameter corresponding to the target fluorescence intensity included in the fifth feedback information based on a pre-labeled corresponding relationship between fluorescence intensity and corona parameter, and adjusts the corona parameter for the target detection position to the target corona parameter, and the fifth feedback information represents that the oil carrying amount at the target detection position of the target header exceeds the second preset threshold, and the fluorescence intensity at the target detection position is the target fluorescence intensity.

20. The method of claim 12, wherein, The method further comprises: Obtaining the oil carrying amount and fluorescence intensity corresponding to each of a plurality of header samples with different cleanliness; Fitting the oil carrying amount and fluorescence intensity of the plurality of header samples to obtain a corresponding relationship between the oil carrying amount and the fluorescence intensity; Based on the corresponding relationship between the oil carrying amount and the fluorescence intensity, determine the fluorescence intensity corresponding to the second preset threshold; The fluorescence intensity corresponding to the second preset threshold is determined as the first preset threshold.

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