CN115790390B - Battery winding detection system and method - Google Patents
Battery winding detection system and method Download PDFInfo
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- CN115790390B CN115790390B CN202211405125.3A CN202211405125A CN115790390B CN 115790390 B CN115790390 B CN 115790390B CN 202211405125 A CN202211405125 A CN 202211405125A CN 115790390 B CN115790390 B CN 115790390B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application provides a battery winding detection system and a method, wherein the battery winding detection system can comprise: the detecting unit is used for detecting the width difference value of the pole piece in the winding stage; the calibration unit is used for outputting a position signal in the acquisition range of the detection unit; the detecting unit is also used for determining whether the detecting unit generates position deviation according to the position signal.
Description
Technical Field
The application relates to the technical field of detection of battery manufacturing processes, in particular to a battery winding detection system and method.
Background
In the manufacturing process of the battery, one of the links is the winding of the pole piece of the battery. In order to make the fabricated battery better meet the requirements, the width difference (OH) is obtained by data acquisition of the edges of the cathode and the anode in the process of winding the pole piece of the battery and then calculation. In order to make the OH value more accurate, the installation position of the acquisition equipment for acquiring the cathode and anode edge data is required to be higher. However, with the use of the collecting device, in the long-term vibration operation process, the bolt of the bracket for installing the collecting device is easy to be worn and loosened, so that the position of the collecting device is changed, and the detection of the OH value is inaccurate after the position of the collecting device is changed.
Disclosure of Invention
Accordingly, an objective of the embodiments of the present application is to provide a system and a method for detecting the winding of a battery, so as to improve the defects in the detection process of the OH value.
In a first aspect, an embodiment of the present application provides a battery winding detection system, including:
the detecting unit is used for detecting the width difference value of the pole piece in the winding stage;
the calibration unit is used for outputting a position signal in the acquisition range of the detection unit;
the detection unit is also used for determining whether the detection unit generates position deviation according to the position signal.
In the above embodiment, by adding the calibration unit, the position of the detection unit can be detected, so that the error in detecting the width difference caused by the position deviation of the detection unit can be reduced, and the accuracy of the width difference detected by the detection unit can be improved from another angle.
In an alternative embodiment, the calibration unit is a laser, and the laser is used for outputting a laser signal within the acquisition range of the detection unit.
In the above embodiment, the calibration unit may be configured as a laser, and the position of the calibration unit is known from the laser signal output by the laser, so that whether the detection unit is shifted in position may be determined based on the relative position of the calibration position and the detection unit. In addition, the laser device is relatively simple, and the installation and the use of the calibration unit can be convenient.
In an alternative embodiment, the detection unit includes: the image acquisition device is used for acquiring image data of the position signal, and determining whether the image acquisition device has offset or not according to the distance between the position signal and a specified reference, wherein the specified reference is one reference set by the image acquisition device.
In an alternative embodiment, the detection unit comprises a plurality of detection components and the calibration unit comprises a plurality of reference components, the number of reference components being the same as the number of detection components.
In the above embodiment, the reference components may be configured one by one, so as to determine whether the position of each detection component is offset one by one, and in addition, each reference component detects whether the position of each detection component is offset or not, so that the position detection of each detection component can be more accurate.
In an alternative embodiment, each reference assembly is mounted within a defined distance range around its corresponding detection assembly such that the position signal output by the reference assembly is within the acquisition range of its corresponding detection assembly.
In the above embodiment, the reference component may be mounted within a limited distance range around the corresponding detection component, so that the position signal output by the reference component may fall within the acquisition range of the detection component, and the detection of the position of the detection component may be more accurate.
In an alternative embodiment, the detection unit includes:
the first detection component is used for detecting the anode edge line of the pole piece in the winding stage;
and the second detection assembly is used for detecting a cathode edge line of the pole piece in the winding stage, and the anode edge line and the cathode edge line are used for determining the width difference value of the pole piece.
In the embodiment, the two detection assemblies are used for detecting the edge lines at different positions respectively, so that the edge lines at different positions can be tested more accurately, and the testing accuracy of the width difference value of the pole piece can be improved.
In an alternative embodiment, the calibration unit comprises:
the first reference component is used for outputting a first position signal in the acquisition range of the first detection component;
the second reference component is used for outputting a second position signal in the acquisition range of the second detection component;
The first detection component is further used for determining whether the first detection component generates position offset according to the first position signal;
the second detection component is further used for determining whether the second detection component is shifted or not according to the second position signal.
In an alternative embodiment, the detection unit further comprises:
the third detection component is used for detecting an anode edge line of the tab side of the pole piece in the winding stage;
and the fourth detection assembly is used for detecting a cathode edge line of the tab side of the pole piece in the winding stage, and the anode edge line and the cathode edge line are used for determining the width difference value of the tab side of the pole piece.
In the above embodiment, the four detecting assemblies are used to detect the width difference between the tab side and the non-tab side of the pole piece, respectively. Therefore, the test result of the width difference value of the pole piece can be better and more reliable, and the battery can be delivered from the factory to better meet the requirements.
In an alternative embodiment, the calibration unit comprises:
the third reference component is used for outputting a third position signal in the acquisition range of the third detection component;
the fourth reference component is used for outputting a fourth position signal in the acquisition range of the fourth detection component;
The third detection component is further used for determining whether the third detection component generates position offset according to the third position signal;
the fourth detection component is further configured to determine whether a position shift occurs in the fourth detection component according to the fourth position signal.
In a second aspect, an embodiment of the present application provides a battery winding detection method, including:
outputting a position signal in the acquisition range of the detection unit through the calibration unit;
collecting image data of the area where the position signal is located through the detection unit;
determining whether the detection unit has an offset according to the image data;
and if the detecting unit does not have offset, detecting the width difference value of the pole piece in the winding stage through the detecting unit.
In an alternative embodiment, the detection unit comprises a plurality of detection components, and the calibration unit comprises a plurality of reference components, the number of reference components being the same as the number of detection components;
the output of the position signal by the calibration unit in the acquisition range of the detection unit comprises: outputting an ith position signal in the acquisition range of an ith detection component through an ith reference component, wherein i is a positive integer which is greater than or equal to 1 and less than or equal to N, and N is the number of the reference components;
The acquiring, by the detection unit, image data of an area where the position signal is located includes: acquiring ith image data of the area where the position signal is located through an ith detection component;
the determining whether the detecting unit has an offset according to the image data includes: determining whether the ith detection component has an offset according to the ith image data;
and if all the detection components do not have offset, detecting the width difference value of the pole piece in the winding stage through the detection unit.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block schematic diagram of a battery winding detection system according to an embodiment of the present application;
FIG. 2 is a schematic view of a partial pole piece provided by an embodiment of the present application;
FIG. 3 is another schematic view of a partial pole piece according to an embodiment of the present application;
fig. 4 is a schematic diagram of an application environment of a detection unit according to an embodiment of the present application;
fig. 5 is a schematic diagram of an application environment of a battery winding detection system according to an embodiment of the present application;
FIG. 6 is another schematic diagram of an application environment of the detection unit according to the embodiment of the present application;
fig. 7 is another schematic diagram of an application environment of the battery winding detection system according to the embodiment of the present application;
fig. 8 is a flowchart of a battery winding detection method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
In the production process of the lithium battery, one link is a lithium battery winding process, and in order to keep the outgoing battery to better meet the battery production standard, the OH value of the cathode and the anode needs to be monitored in the battery core winding process so as to prevent the bad battery from being outgoing from the factory.
The inventor of the present application has studied and learned that in the process of winding the battery cell, the winding device is provided with CCD (charge coupled device ) cameras for detecting the pole pieces at the inner side and the outer side of the feeding position in the direction facing the winding needle, the edges of the anode and cathode of the wound pole pieces are photographed from a plurality of angles by the CCD cameras, and then the OH value can be calculated based on the photographs. The key to the accuracy of the OH value is whether the CCD camera mounting position is accurate or not, and whether the mounting position is shifted unexpectedly during use. The CCD camera is currently mounted by a bracket, which is typically mounted by a fixing member such as a bolt or a screw. Then even if the initial position is installed very accurately, the fixing piece is inevitably worn and loosened in the long-term vibration operation process along with the use of the CCD camera, so that the position of the CCD camera is shifted from the initial position, the acquired data of the CCD camera are inaccurate once the position of the CCD camera is shifted, the OH value detected in the production process of the battery core is possibly distorted, the poor-OH-value battery core flows out, and the battery core with the original normal OH value is possibly judged to be abnormal.
Based on the above-described state of the art, the inventors of the present application have found that it is possible to detect whether or not the position of the CCD camera is shifted, and thus the OH value detected by the CCD camera can be more accurate. Therefore, the embodiment of the application provides a battery winding detection system and a battery winding detection method, which can realize the detection of the position of a CCD camera.
The battery winding detection system provided by the embodiment of the application can be arranged around winding equipment of a pole piece winding stage of an electric core in a battery manufacturing factory and is used for collecting data of the cathode and anode edges of the pole piece in the winding process.
An embodiment of the present application provides a battery winding detection system, as shown in fig. 1, which may include: a detection unit 110 and a calibration unit 120.
The detecting unit 110 may be used to detect the width difference of the pole pieces in the winding stage.
The width difference represents the difference in width of the cathode and anode of the pole piece and can also be recorded as the OH value.
As shown in fig. 2, fig. 2 shows a schematic view of a partial pole piece. The cathode C1, the anode A1, and the reference line Bl1 are shown. The OH value of the pole piece can then be expressed as the distance between the edge of the cathode C1 and the edge of the anode A1.
In the example shown in fig. 2, the detecting unit 110 may determine the distance e between the edge of the anode A1 and the reference line Bl1, the detecting unit 110 determines the distance f between the edge of the cathode C1 and the reference line Bl1, and then determines the OH value of the pole piece according to the distance e and the distance f, where the OH value may be expressed as oh=f-e by a formula.
In this embodiment, the calibration unit 120 may be configured to output a position signal within the acquisition range of the detection unit 110.
The detecting unit 110 is further configured to determine whether the detecting unit 110 is shifted according to the position signal output by the calibration unit 120.
In one embodiment, if the initial installation positions of the detection unit 110 and the calibration unit 120 are kept unchanged, and the device parameters of the detection unit 110 are not changed, the position of the position signal output by the calibration unit 120 acquired by the detection unit 110 each time is not changed. Therefore, whether the position of the position signal output from the calibration unit 120 acquired by the detection unit 110 is changed or not can be determined to determine whether the detection unit 110 is shifted or not.
For example, the detecting unit 110 may collect image data including the position signal output by the calibration unit 120 according to a set period, and determine whether the position of the position signal in the image is changed according to whether the position signal in the plurality of image data is changed, if the position signal is changed, it may be determined that there is a relative position change between the detecting unit 110 and the calibration unit 120, and it may be determined that the position of the detecting unit 110 is shifted.
The set period may be set as desired, for example, the set period may be once every second, once every five seconds, etc.
In another embodiment, if the detecting unit 110 is provided with a reference line for detecting the OH value of the pole piece, whether the distance between the position signal and the reference line of the detecting unit 110 is changed may be determined.
For example, as shown in fig. 3, the position of the position signal may be denoted as P1. The real-time distance between the position P1 where the position signal is located and the reference line Bl1 of the detection unit 110 may be denoted as d1.
Alternatively, an initial distance d0 may be stored when the calibration unit 120 is initially installed, the initial distance d0 representing a distance between a position of the position signal output when the calibration unit 120 is installed and the reference line Bl1 of the detection unit 110. The real-time distance d1 between the position P1 where the position signal is located and the reference line Bl1 of the detection unit 110 may then be compared with a pre-stored initial distance d0 to determine whether a relative position change has occurred between the calibration unit 120 and the detection unit 110, thereby determining whether a position shift has occurred in the detection unit 110. If the real-time distance d1 is different from the pre-stored initial distance d0, it can be determined that the relative position between the calibration unit 120 and the detection unit 110 is changed, and thus it can be determined that the detection unit 110 is shifted.
Alternatively, it may be determined whether the real-time distance between the position P1 where the position signal is located and the reference line Bl1 of the detecting unit 110 is changed at different time points, so as to determine whether the relative position between the calibration unit 120 and the detecting unit 110 is changed, thereby determining whether the detecting unit 110 is shifted. If the real-time distance between the position P1 where the position signal is located and the reference line Bl1 of the detection unit 110 is changed, it can be determined that the relative position between the calibration unit 120 and the detection unit 110 is changed, and thus it can be determined that the detection unit 110 is shifted.
Considering that if the detection unit 110 is shifted, the accuracy of the detection unit 110 in detecting the pole piece in the winding stage is affected, a prompt signal can be output after the detection unit 110 is shifted, so as to prompt related personnel and reduce the probability of leaving the factory of the defective battery cell.
The indication signal may output a light signal through a signal lamp provided at the periphery of the winding apparatus, and the indication signal may output an acousto-optic signal through an acousto-optic signal lamp provided at the periphery of the winding apparatus.
The prompt signal may also be output by an upper computer connected to the detecting unit 110. For example, the alert signal may be a text alert signal. The alert signal may also be an iconic alert signal presented at a specific location. For example, the host computer may display a schematic map of the battery manufacturing plant, on which the relative positions of the respective devices in the battery manufacturing plant in the schematic map may be marked, and may output an icon prompting signal at the schematic position of the detection unit 110 in the schematic map. For example, when the icon prompting signal is green, it indicates that the detecting unit 110 is working normally; when the icon prompting signal is red, it indicates that the detecting unit 110 is shifted.
By adding the calibration unit 120, the battery winding detection system provided by the embodiment of the application can realize the detection of the position of the detection unit 110, so that the condition that errors exist in the detection of the width difference value caused by the position deviation of the detection unit 110 can be reduced, and the accuracy of the width difference value detected by the detection unit 110 can be improved from another angle. The detection of the OH value of the wound pole piece and the detection of the position of the detection unit 110 itself can be achieved.
The calibration unit 120 may be a laser. This is because the laser has high energy, good directivity, unique monochromaticity and coherence, and a gas laser with continuous waves can emit a high-intensity coherent beam over a long distance. And the laser reference has the characteristics of good stability, good instantaneity, high precision, simple structure, convenient installation, low cost and the like.
The laser may be used to output a laser signal within the acquisition range of the detection unit 110.
Of course, the calibration unit 120 may have other structures, for example, a visible signal may be left in the acquisition range of the detection unit 110.
Illustratively, the detection unit 110 includes: an image acquisition device. The acquisition range of the detection unit 110 may be a range that the image acquisition device can acquire an image.
The image acquisition device may be a CCD camera. Of course, the image acquisition device may be other cameras capable of image acquisition.
The image acquisition device is used for acquiring image data of the position signal, and determining whether the image acquisition device has offset or not by means of the distance between the position signal and a specified reference.
Wherein the specified reference is a reference set by the image capturing apparatus. In the example shown in fig. 2 or 3, the specified reference may be a fixed reference line that is disposed beyond the edge of the pole piece.
The specified reference may also be a reference built into the image acquisition device, for example, the specified reference may be a reference line calibrated by the image acquisition device.
In this embodiment, the image capturing device may also capture image data of the cathode edge of the pole piece and image data of the anode edge in the winding stage. And then determining the width difference value of the pole piece according to the image data of the cathode edge and the image data of the anode edge.
Illustratively, the cathode edge in the image may also be determined from the image data of the cathode edge, and the anode edge in the image may be determined from the image data of the anode edge.
A pixel threshold value may be calibrated before the image acquisition device is put into use, the pixel threshold value being used to identify an anode edge in the image and a cathode edge in the image. The pixel threshold may be formed from a point value, for example, where a pixel is less than the pixel threshold, a non-film region of the pole piece may be determined, and if a pixel is greater than the pixel threshold, a film region of the pole piece may be determined. The pixel threshold may be formed by a segment, for example, where the pixel is less than the minimum of the segment, the non-film region of the pole piece may be determined, and if the pixel is greater than the maximum of the segment, the film region of the pole piece may be determined. For another example, the pixel threshold may be composed of two point values, a first point value and a second point value, wherein the first point value is smaller than the second point value, and if the pixel is smaller than the first point value, the pixel threshold may be determined to be a non-film region of the pole piece, and if the pixel is larger than the second point value, the pixel threshold may be determined to be a film region of the pole piece.
When the image acquisition equipment processes the image data of the cathode edge, the film area and the non-film area of the pole piece can be determined according to the pixel threshold value, and the junction of the film area and the non-film area can be determined as the edge of the pole piece. For example, the pixel threshold may also include a first point value and a second point value, and the boundary line, that is, the edge of the pole piece, may be fitted at a transition point where the pixel transitions from the first value to the second point value in the image data acquired by the image acquisition device. For example, the first point value is 20 pixels, the second point value is 300 pixels, and the boundary line can be fitted at a jump point from 20 to 300 pixels in the image data acquired by the image acquisition device.
If a plurality of image acquisition devices for detecting the OH value of the pole piece are provided in a battery manufacturing plant. The pixel thresholds calibrated for the image acquisition devices at different locations may be the same. Of course, if the light rays or the environments at different positions are different, different pixel thresholds can be calibrated for the image acquisition devices at different positions according to actual conditions.
Optionally, parameters such as a light source position, brightness, light color and the like of the image acquisition device may be adjusted before the pixel threshold calibration is achieved. The calibration of the pixel threshold value is carried out on the premise that the image acquired by the image acquisition equipment is clear and has no fuzzy ghost. So as to better keep the picture shot by the image acquisition equipment each time relatively clearer, and no other foreign matter interference exists in the acquisition range of the image acquisition equipment.
Alternatively, parameter criteria may also be set for the image acquisition device. For example, the parameter standard may include standard parameters such as a definition standard interval, a resolution standard interval, and the like; the definition standard interval and the resolution standard interval are used for evaluating the imaging quality of the image acquisition equipment. For example, the sharpness of the image collected by the image collecting device may be compared with a sharpness standard interval, and the resolution of the collected image may be compared with a resolution standard interval, so as to determine the quality of the image collected by the image collecting device. If the acquired image does not meet the set parameter standard, a prompt message can be output so that the related technician can adjust the image acquisition equipment.
Optionally, the mounting position of the image acquisition device may also be adjusted so that the edge of the pole piece that the image acquisition device needs to detect can be located at a specified position in the image. For example, the specified position may be an intermediate position of the image.
If the edge of the acquired pole piece does not fall into the designated position in the image, the image acquisition device can be determined to be offset, so that a prompt message is output, and a related technician can adjust the image acquisition device to reduce the error of the OH value detected by the image acquisition device.
In order to achieve detection of the OH value of the pole pieces in different positions, the detection unit 110 comprises a plurality of detection components. To enable multiple detection component position detection, the calibration unit 120 may include multiple fiducial components. The number of reference components is the same as the number of detection components.
For example, the detection unit 110 may include four detection components. The calibration unit 120 may also include four fiducial components. Of course, the detection unit 110 may also include other numbers of detection components, depending on the needs of the actual scenario.
For example, each fiducial component may be used to assist in detecting the positional offset of one of the detection components.
Alternatively, the detection component may be an image acquisition device and the reference component may be a laser.
In an alternative embodiment, each reference assembly is mounted within a defined distance range around its corresponding detection assembly such that the position signal output by the reference assembly is within the acquisition range of its corresponding detection assembly.
For example, the limiting distance may be different according to the acquisition range of the detection components, e.g. the acquisition range of some detection components is relatively large, the limiting distance may also be set to a relatively large value, so that a change in the position signal may be achieved that is easier to detect. For another example, if the acquisition range of some detection components is relatively small, the limiting distance may also be set to a relatively small value, so that the detection components can more easily acquire the position signal output by the reference component.
In the implementation manner, the reference component and the detection component can be configured one by one, whether the position of each detection component is offset or not can be determined one by one, and the position detection of each detection component can be more accurate. Furthermore, the reference component can be arranged in a limited distance range around the corresponding detection component, so that the position signal output by the reference component can fall into the acquisition range of the detection component, and the detection of the position of the detection component can be more accurate.
In one implementation, the detection component that collects the edge of the cathode in the pole piece and the detection component that collects the edge of the anode in the pole piece may be two relatively independent detection components. As shown in fig. 4, the detection unit 110 includes: a first detection assembly 111 and a second detection assembly 112. Also shown in fig. 4 are anode A1, cathode C1, separator 130, and winding pin 140. Wherein the anode A1, the cathode C1, and the separator 130 are wound around the winding needle 140.
It should be understood that fig. 4 is only an example of the relative positional relationship between the first detecting component 111 and the second detecting component 112, and the anode A1, the cathode C1, the diaphragm 130, and the winding needle 140, and in practical cases, each of the first detecting component 111 and the second detecting component 112 needs to be mounted at a specific position by some structures such as brackets, fixtures, and the like. The positions where the first and second detecting members 111 and 112 are installed may be different depending on the complexity of the actual use environment, but it is known that the positions where the first and second detecting members 111 and 112 are installed enable the image acquisition of the edges of the anode A1 and the cathode C1.
Wherein the first detection assembly 111 may be used to detect the anode edge line of the pole piece during the winding phase.
The second detection assembly 112 may be used to detect a cathode edge line of the pole piece during the winding phase, the anode edge line and the cathode edge line being used to determine a width difference of the pole piece.
Optionally, a processor is disposed in the first detection assembly 111 or the second detection assembly 112, and the processor may be configured to determine a width difference of the pole piece based on the anode edge line and the cathode edge line.
Alternatively, the first and second detection assemblies 111, 112 may also be communicatively coupled to an electronic device by which the difference in width of the pole pieces is determined based on the anode edge line and the cathode edge line.
In this embodiment, the first detection component 111 and the second detection component 112 can be calibrated before being put into use, so as to calibrate a first reference line for the first detection component 111 and the second detection component 112.
When the width difference of the pole piece is determined according to the anode edge line and the cathode edge line, a first distance can be determined according to the anode edge line and the first reference line, a second distance can be determined according to the cathode edge line and the first reference line, and the width difference of the pole piece can be determined according to the difference of the first distance and the second distance.
For the position detection of the first detection component 111 and the second detection component 112, as shown in fig. 5, the calibration unit 120 includes: a first fiducial component 121 and a second fiducial component 122.
It should be understood that fig. 5 is only an example of the relative positional relationship between the first detecting component 111 and the second detecting component 112 and the first reference component 121 and the second reference component 122, and in practical situations, each of the first detecting component 111, the second detecting component 112, and the first reference component 121 and the second reference component 122 may also need to be mounted at a specific position by some structures such as brackets, fixtures, and the like.
Wherein the first reference component 121 may be configured to output a first position signal within the acquisition range of the first detection component 111.
The second fiducial component 122 may be configured to output a second position signal within the acquisition range of the second detection component 112.
The first detection component 111 may be configured to determine whether the first detection component 111 is shifted in position based on the first position signal.
For example, the first detection component 111 may acquire image data comprising a first position signal. And then, according to whether the position of the first position signal in the image data is changed, whether the relative position of the first detection component 111 and the first reference component 121 is changed is determined, so that whether the first detection component 111 is shifted is further confirmed. If the position of the first position signal is changed, it is determined that the relative position of the first detecting assembly 111 and the first reference assembly 121 is changed, so as to further confirm that the first detecting assembly 111 is shifted.
Alternatively, whether the first detection unit 111 is shifted in position may be determined according to the distance between the position of the first position signal and the first reference line.
Alternatively, the distance between the position of the first position signal acquired multiple times by the first detecting component 111 and the position of the first reference line may be compared, and if the distance between the position of the first position signal acquired multiple times and the position of the first reference line is changed, it may be determined that the position of the first position signal acquired multiple times is changed, it is determined that the first detecting component 111 is shifted in position.
Alternatively, a real-time distance between the position of the first position signal acquired by the first detecting unit 111 in real time and the position of the first reference line and an initial distance between the position of the first reference unit 121 and the position of the position signal output from the first detecting unit at the beginning of the installation and the position of the first reference line may be determined, and the real-time distance and the initial distance may be compared to determine whether the real-time distance is the same as the initial distance. If the real-time distance is different from the initial distance, it may be determined that the relative position of the first detecting member 111 and the first reference member 121 is changed, and if the relative position of the first detecting member 111 and the first reference member 121 is changed, it is determined that the first detecting member 111 is shifted.
In this embodiment, the second detecting component 112 may be configured to determine whether the second detecting component 112 is shifted according to the second position signal.
Illustratively, the second detection component 112 may acquire image data comprising the second position signal. And then determining whether the relative positions of the second detection component 112 and the second reference component 122 are changed according to whether the positions of the second position signals in the image data are changed, so as to further confirm whether the second detection component 112 is shifted. If the position of the second position signal is changed, it is determined that the relative position of the second detecting component 112 and the second reference component 122 is changed, so as to further confirm that the second detecting component 112 is shifted.
Alternatively, the position of the second position signal may be compared with the position of the first reference line to determine whether the second detecting member 112 is shifted.
Alternatively, the distance between the position of the second position signal acquired by the second detecting component 112 multiple times and the position of the first reference line may be compared, and if the distance between the position of the second position signal acquired by multiple times and the position of the first reference line is changed, it may be determined that the position of the second position signal acquired by multiple times is changed, it is determined that the second detecting component 112 is shifted in position.
Alternatively, a real-time distance between the position of the second position signal acquired by the second detecting component 112 in real time and the position of the first reference line, and an initial distance between the position of the second reference component 122 and the position of the position signal output from the first detecting component at the beginning of installation and the position of the first reference line may be determined, and the real-time distance and the initial distance may be compared to determine whether the real-time distance is the same as the initial distance. If the real-time distance is different from the initial distance, it may be determined that the relative position of the second sensing component 112 and the second reference component 122 is changed, and if the relative position of the second sensing component 112 and the second reference component 122 is changed, it is determined that the second sensing component 112 is shifted.
In order to more comprehensively test the OH value of the pole piece, a group of detection assemblies can be arranged on the tab side and the non-tab side of the pole piece. As shown in fig. 6, the detection unit 110 may further include: a third detection assembly 113 and a fourth detection assembly 114.
It should be understood that fig. 6 is only an example of the relative positional relationship between the first detecting assembly 111, the second detecting assembly 112, the third detecting assembly 113 and the fourth detecting assembly 114, and the anode A1, the cathode C1, the diaphragm 130 and the winding needle 140, and in practical situations, each of the first detecting assembly 111, the second detecting assembly 112, the third detecting assembly 113 and the fourth detecting assembly 114 may also need to be mounted at a specific position by some structures such as brackets, fasteners and the like.
The third detection assembly 113 may be used to detect the anode edge line on the tab side of the pole piece during the winding phase.
The fourth detection assembly 113 may be used to detect the cathode edge line on the tab side of the pole piece during the winding phase. The anode edge line detected by the third detection component and the cathode edge line detected by the fourth detection component are used for determining the width difference value of the tab side of the pole piece.
In this example, the third detecting element 113 and the fourth detecting element 114 are used to detect the width difference on the tab side. The first detecting element 111 and the second detecting element 112 can be used to detect the width difference on the non-tab side.
Optionally, a processor is disposed in the third detecting component 113 or the fourth detecting component 114, and the processor may be configured to determine a width difference of the pole piece according to the anode edge line on the tab side and the cathode edge line on the tab side.
Optionally, the third and fourth detection assemblies 113 and 114 may also be communicatively coupled to an electronic device by which the width difference of the pole pieces is determined based on the anode edge line and the cathode edge line.
In this embodiment, the third detecting element 113 and the fourth detecting element 114 can be calibrated before being put into use, so as to calibrate the second reference line for the third detecting element 113 and the fourth detecting element 114.
And determining the width difference value of the tab side of the pole piece according to the anode edge line of the tab side and the cathode edge line of the tab side, determining a third distance according to the anode edge line of the tab side and the second reference line, determining a fourth distance according to the cathode edge line of the tab side and the second reference line, and determining the width difference value of the tab side of the pole piece according to the difference value of the third distance and the fourth distance.
For the position detection of the third detection component 113 and the fourth detection component 114, as shown in fig. 7, the calibration unit 120 may include a third reference component 123 and a fourth reference component 124.
It will be appreciated that fig. 7 is merely an example of the relative positional relationship of the four detection assemblies and the four reference assemblies, and in practice, each detection assembly and each reference assembly need to be mounted at a specific location by some structure such as brackets, fasteners, etc.
A third reference component 123 for outputting a third position signal within the acquisition range of the third detection component 113.
A fourth reference component 124 for outputting a fourth position signal within the acquisition range of the fourth detection component 114.
The third detecting component 113 is further configured to determine whether a position shift occurs in the third detecting component 113 according to the third position signal.
Wherein the determination of whether the third detection component 113 is offset is similar to the determination of whether the first detection component 111 is offset.
Illustratively, the third detection component 113 may acquire image data containing a third position signal. And then, whether the relative position of the third detecting component 113 and the third reference component 123 is changed is determined according to whether the position of the third position signal in the image data is changed, so that whether the position of the third detecting component 113 is shifted is further confirmed. If the position of the third position signal is changed, it is determined that the relative position of the third detecting assembly 113 and the third reference assembly 123 is changed, so as to further confirm that the third detecting assembly 113 is shifted.
Alternatively, whether the third detecting unit 113 is positionally shifted may be determined according to a distance between the position of the third position signal and the above-described second reference line.
Alternatively, the distance between the position of the third position signal acquired multiple times by the third detecting assembly 113 and the position of the second reference line may be compared, and if the distance between the position of the third position signal acquired multiple times and the position of the second reference line is changed, it may be determined that the position of the third position signal acquired multiple times is changed, it is determined that the third detecting assembly 113 is shifted in position.
Alternatively, a real-time distance between the position of the third position signal acquired by the third detecting unit 113 in real time and the position of the second reference line, and an initial distance between the position of the third reference unit 123 and the position of the position signal output from the first detecting unit and the position of the second reference line may be determined, and the real-time distance may be compared with the initial distance to determine whether the real-time distance is the same as the initial distance. If the real-time distance is different from the initial distance, it may be determined that the relative position of the third sensing assembly 113 and the third reference assembly 123 is changed, and if the relative position of the third sensing assembly 113 and the third reference assembly 123 is changed, it is determined that the third sensing assembly 113 is shifted.
In this embodiment, the fourth detecting component 114 is further configured to determine whether the fourth detecting component 114 is shifted according to the fourth position signal.
Wherein the determination of whether the fourth detection component 114 is offset is similar to the determination of whether the second detection component 112 is offset.
For example, the fourth detection component 114 may acquire image data comprising a fourth position signal. And then determines whether the relative positions of the fourth detecting component 114 and the fourth reference component 124 are changed according to whether the position of the fourth position signal in the image data is changed, so as to further confirm whether the fourth detecting component 114 is shifted. If the position of the fourth position signal changes, it is determined that the relative positions of the fourth detecting element 114 and the fourth reference element 124 change, so as to further confirm that the fourth detecting element 114 is shifted.
Alternatively, the position of the fourth position signal may be compared with the position of the second reference line to determine whether the fourth detection component 114 is shifted.
Alternatively, the distance between the position of the fourth position signal acquired multiple times by the fourth detecting component 114 and the position of the second reference line may be compared, and if the distance between the position of the fourth position signal acquired multiple times and the position of the second reference line is changed, it may be determined that the position of the fourth position signal acquired multiple times is changed, it is determined that the fourth detecting component 114 is shifted in position.
Alternatively, a real-time distance between the position of the fourth position signal acquired by the fourth detecting component 114 in real time and the position of the second reference line, and an initial distance between the position of the fourth reference component 124 and the position of the position signal output from the installation and the position of the second reference line may be determined, and the real-time distance and the initial distance may be compared to determine whether the real-time distance is the same as the initial distance. If the real-time distance is different from the initial distance, it may be determined that the relative position of the fourth detection component 114 and the fourth reference component 124 has changed, and if the relative position of the fourth detection component 114 and the fourth reference component 124 has changed, it is determined that the fourth detection component 114 has shifted in position.
Through the arrangement of the calibration unit, whether the detection unit is offset or not can be monitored better, the condition that the OH value detected by the offset detection unit is taken as an effective value can be reduced, and the reliability of the OH value detected by the detection unit can be improved. Further, when the detecting unit includes a plurality of detecting components, a reference component can be configured for each detecting component, so that whether the detecting unit detects one-to-one position deviation is realized, the position of the detecting component can be better monitored, and the reliability of the OH value detected by the detecting unit is improved.
Fig. 8 is a flowchart of a battery winding detection method according to an embodiment of the application. The steps in the method of this embodiment may be performed by the above-described battery winding detection system, and the specific flow shown in fig. 8 will be described in detail below.
Step 210, outputting, by the calibration unit, a position signal within the acquisition range of the detection unit.
The calibration unit may output a position signal into the acquisition range at a set frequency, for example. The set frequency may be set as needed, for example, the position signal may be output every 0.1 seconds, 0.2 seconds, or the like.
The calibration unit may also, for example, continuously output a position signal into the acquisition range of the detection unit.
Step 220, collecting image data of the area where the position signal is located through the detection unit.
In this embodiment, the step 220 may be implemented by a detection unit, and thus, reference may be made to the description related to the detection unit in the above battery winding detection system, which is not repeated herein.
Step 230, determining whether the detection unit has an offset according to the image data.
Alternatively, the step 230 may be implemented by a detection unit in the battery winding detection system, or may be implemented by an electronic device having a processing function connected to the detection unit.
If the detection unit has no offset, step 240 may be performed.
Step 240, detecting the width difference of the pole piece in the winding stage by the detecting unit.
The detection manner of the width difference of the pole piece may refer to the related description of the detection of the width difference of the pole piece in the detection unit in the embodiment of the battery winding detection system, which is not described herein.
Illustratively, the sensing unit includes a plurality of sensing components and the calibration unit includes a plurality of reference components, the number of reference components being the same as the number of sensing components.
Step 210 described above may include: and outputting an ith position signal in the acquisition range of the ith detection component through the ith reference component.
Wherein i is a positive integer greater than or equal to 1 and less than or equal to N, N being the number of reference components; for example, the detection unit may include four detection components, and the calibration unit includes four reference components, where N has a value of 4.
For example, if the reference component is a laser, the position signal may be a laser signal.
The step 220 may include: and acquiring the ith image data of the area where the position signal is located through the ith detection component.
The step 230 may include: based on the ith image data, it is determined whether an offset exists for the ith detection element.
If there is no offset in all the detection components, step 240 is performed.
Other details regarding the method provided in the embodiment of the present application may also refer to the functional descriptions of each unit and each component in the above battery winding detection system, which are not repeated herein.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A battery winding detection system, characterized by comprising:
the detecting unit is used for detecting the width difference value of the pole piece in the winding stage;
the calibration unit is used for outputting a position signal in the acquisition range of the detection unit;
the detection unit is also used for determining whether the detection unit generates position deviation according to the position signal;
the detection unit includes: the image acquisition device is used for acquiring image data of the position signal, and determining whether the image acquisition device has offset or not according to the distance between the position signal and a specified reference, wherein the specified reference is one reference set by the image acquisition device.
2. The system of claim 1, wherein the calibration unit is a laser configured to output a laser signal within an acquisition range of the detection unit.
3. The system of claim 1, wherein the detection unit comprises a plurality of detection components and the calibration unit comprises a plurality of reference components, the number of reference components being the same as the number of detection components.
4. A system according to claim 3, wherein each of the fiducial assemblies is mounted within a defined distance range around its corresponding detection assembly such that the position signal output by the fiducial assembly is within the acquisition range of its corresponding detection assembly.
5. The system of claim 1, wherein the detection unit comprises:
the first detection component is used for detecting the anode edge line of the pole piece in the winding stage;
and the second detection assembly is used for detecting a cathode edge line of the pole piece in the winding stage, and the anode edge line and the cathode edge line are used for determining the width difference value of the pole piece.
6. The system of claim 5, wherein the calibration unit comprises:
the first reference component is used for outputting a first position signal in the acquisition range of the first detection component;
the second reference component is used for outputting a second position signal in the acquisition range of the second detection component;
The first detection component is further used for determining whether the first detection component generates position offset according to the first position signal;
the second detection component is further used for determining whether the second detection component is shifted or not according to the second position signal.
7. The system of claim 5, wherein the detection unit further comprises:
the third detection component is used for detecting an anode edge line of the tab side of the pole piece in the winding stage;
and the fourth detection assembly is used for detecting a cathode edge line of the tab side of the pole piece in the winding stage, and the anode edge line and the cathode edge line are used for determining the width difference value of the tab side of the pole piece.
8. The system of claim 7, wherein the calibration unit comprises:
the third reference component is used for outputting a third position signal in the acquisition range of the third detection component;
the fourth reference component is used for outputting a fourth position signal in the acquisition range of the fourth detection component;
the third detection component is further used for determining whether the third detection component generates position offset according to the third position signal;
the fourth detection component is further configured to determine whether a position shift occurs in the fourth detection component according to the fourth position signal.
9. A battery winding detection method, characterized by comprising:
outputting a position signal in the acquisition range of the detection unit through the calibration unit;
collecting image data of the area where the position signal is located through the detection unit;
determining whether the detection unit has an offset according to the image data;
if the detecting unit does not have offset, detecting the width difference value of the pole piece in the winding stage through the detecting unit;
wherein the detection unit comprises an image data image acquisition device for acquiring the position signal; the method further comprises the steps of: and determining whether the image acquisition device has offset or not according to the distance between the position signal and a specified reference by the image acquisition device, wherein the specified reference is one reference set by the image acquisition device.
10. The method of claim 9, wherein the detection unit comprises a plurality of detection components and the calibration unit comprises a plurality of reference components, the number of reference components being the same as the number of detection components;
the output of the position signal by the calibration unit in the acquisition range of the detection unit comprises: outputting an ith position signal in the acquisition range of an ith detection component through an ith reference component, wherein i is a positive integer which is greater than or equal to 1 and less than or equal to N, and N is the number of the reference components;
The acquiring, by the detection unit, image data of an area where the position signal is located includes: acquiring ith image data of the area where the position signal is located through an ith detection component;
the determining whether the detecting unit has an offset according to the image data includes: determining whether the ith detection component has an offset according to the ith image data;
and if all the detection components do not have offset, detecting the width difference value of the pole piece in the winding stage through the detection unit.
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| CN114549531A (en) * | 2022-04-26 | 2022-05-27 | 广州市易鸿智能装备有限公司 | Lithium battery winding overhung centering correction control system and method |
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| CN102007767A (en) * | 2008-04-17 | 2011-04-06 | 松下电器产业株式会社 | Imaging position determination method and imaging position determination device |
| CN102878926A (en) * | 2012-09-17 | 2013-01-16 | 武汉理工大学 | High-sensitivity strip drift detection device based on array infrared technology |
| CN104964652A (en) * | 2015-06-25 | 2015-10-07 | 惠州时代电池有限公司 | Cell winding production detection method and device based on machine vision |
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