Tab misalignment amount measurement method and measurement device

Abstract

A tab misalignment amount measurement method and measurement device, for use in performing measurement on a tab during merging components of an electrode assembly on a merging mechanism, thereby improving the measurement precision and accuracy. The measurement method comprises: acquiring first data and second data collected by a data collection device, the first data including data of a target edge of a tab, the second data including data of a scale line on a merging mechanism, and the target edge including an edge of a merging surface of the tab (110); generating a target image on the basis of the first data and the second data, the target image including an image showing the relationship between whether the target edge is collected and a collection time, and the relationship between whether the scale line is collected and the collection time (120); on the basis of the target image, determining a scale value corresponding to the target edge on the scale line (130); and determining a misalignment amount of the tab on the basis of the scale value (140).

Description

Method and apparatus for detecting tab misalignment Cross-reference of related applications

[0001] This application claims priority to Chinese Patent Application No. 202510111934.0, filed on January 23, 2025, entitled “Method and Apparatus for Detecting the Amount of Electrode Misalignment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery testing technology, and more specifically, to a method and device for detecting tab misalignment. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] To meet battery performance and lifespan requirements, the position of the tabs in the battery electrode assembly must conform to design specifications; that is, the misalignment of the tabs must also meet design requirements. For example, in a wound electrode assembly, excessive tab misalignment—meaning the tabs deviate significantly from the design specifications—may prevent the welding machine from accurately aligning the tabs and leads, resulting in weak welds or even detachment. It may also reduce the distance between the positive and negative tabs, posing a short-circuit risk to the battery. Currently, the methods used to detect tab misalignment during the electrode assembly winding process result in significant discrepancies between the detected and actual misalignment. This is especially problematic after hot pressing of the electrode assembly, where the tab position deviates severely from the design specifications, potentially leading to a large number of scrapped products. Summary of the Invention

[0005] This application provides a method and apparatus for detecting tab misalignment, which can improve the accuracy and precision of the detection.

[0006] In a first aspect, a method for detecting tab misalignment is provided. This method is used to detect the tabs of an electrode assembly during the stacking of electrode assemblies on a stacking mechanism. The method includes: acquiring first data and second data collected by a data acquisition device, wherein the first data includes data of the target edge of the tab, and the second data includes data of marking scale lines on the stacking mechanism, and the target edge includes the edge of the stacking surface of the tab; generating a target image based on the first data and the second data, wherein the target image includes an image showing whether the target edge was captured in relation to the acquisition time and whether the marking scale lines were captured in relation to the acquisition time; determining the scale value corresponding to the target edge on the marking scale line based on the target image; and determining the tab misalignment based on the scale value corresponding to the target edge on the marking scale line.

[0007] In this embodiment, the data acquisition device can collect data including the target edge of the tab and data including the marking scale lines on the stacking mechanism to generate a target image including the target edge and the marking scale lines changing with the data acquisition time. The scale value corresponding to the target edge on the marking scale line can be determined based on the target image, thereby detecting the misalignment of the tab and improving the accuracy and precision of the detection.

[0008] In one possible implementation, the stacking mechanism includes a winding mechanism and the electrode assembly includes a wound electrode assembly.

[0009] In this embodiment of the application, a target image can be generated by acquiring first data including target edge information of the tab of the wound electrode assembly and second data including marking scale line information on the winding mechanism, based on the data acquisition device. The scale value corresponding to the target edge on the marking scale line can be determined based on the target image, thereby detecting the tab misalignment of the wound electrode assembly. This can improve the accuracy and precision of the tab misalignment detection of the wound electrode assembly.

[0010] In one possible implementation, the marking scale lines are set along a first direction, which is the circumferential direction of the winding mechanism.

[0011] In this embodiment of the application, the misalignment of the electrode tab is detected by setting marking scale lines along its circumference on the winding mechanism, which can clearly reflect the misalignment of the electrode tab.

[0012] In one possible implementation, the marking scale line is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0013] In this embodiment of the application, by detecting the misalignment of the lamination surface of the tab along the circumferential edge of the winding mechanism, the misalignment of the tab can be more clearly reflected, thereby improving the accuracy of the tab misalignment detection.

[0014] In one possible implementation, the marking scale line is set on the winding surface of the first end of the winding mechanism along a second direction, where the second direction is the axial direction of the winding mechanism and the first end is the end away from the tab.

[0015] In this embodiment, the marking scale line can be set on the winding surface of the winding mechanism along its axial direction and away from the tab, so that the data of the target edge of the tab and the marking scale line do not interfere with each other when collecting data, the data of the target edge and the marking scale line can be accurately collected, thereby generating an accurate and interference-free target image, and thus accurately detecting the misalignment of the tab.

[0016] In one possible implementation, the marking scale lines consist of equally spaced scale lines.

[0017] In this embodiment of the application, by setting the marking scale lines to equally spaced scale lines, it is convenient to calculate the scale value of the target edge at the corresponding marking scale line.

[0018] In one possible implementation, the target edge includes the edge of at least one end of the stacked surface of the target tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target tab being the outermost tab of the electrode assembly during the winding process.

[0019] In this embodiment of the application, by detecting the misalignment of the lamination surface of the tab along the circumferential edge of the winding mechanism, the misalignment of the tab can be more clearly reflected, thereby improving the accuracy of the tab misalignment detection.

[0020] In one possible implementation, acquiring first data and second data using a data acquisition device includes: acquiring first data using a first data acquisition device and acquiring second data using a second data acquisition device, wherein the data acquisition device includes both a first data acquisition device and a second data acquisition device.

[0021] In this embodiment, a first data acquisition device can be used to acquire data of the target edge of the electrode tab, and a second data acquisition device can acquire data of the marking scale lines. The two data acquisition devices do not interfere with each other when acquiring data, and can accurately acquire data of the target edge and data of the marking scale lines to generate a target image in which the data of the target edge and the data of the marking scale lines do not interfere with each other, thereby enabling accurate detection of the misalignment of the electrode assembly.

[0022] In one possible implementation, the first data acquisition device and the second data acquisition device can simultaneously acquire data along the same radial direction of the winding mechanism.

[0023] In this embodiment, the first data acquisition device and the second data acquisition device can simultaneously acquire data located on the same radial direction of the winding mechanism. Based on the time when the first data acquisition device acquires the target edge, the scale value acquired by the second data acquisition device at that time can be accurately determined, and this scale value can be used as the scale value corresponding to the target edge on the marked scale line. This allows for accurate determination of the scale value of the target edge on the marked scale line, thereby improving the accuracy of the tab misalignment detection.

[0024] In one possible implementation, the first data acquisition device and the second data acquisition device are positioned in a third direction, where the third direction is any radial direction of the winding mechanism.

[0025] In this embodiment of the application, the first data acquisition device and the second data acquisition device are arranged on the same radial direction of the winding mechanism, so that the first data acquisition device and the second data acquisition device can acquire data on the same radial direction of the winding mechanism at the same time as much as possible, thereby accurately determining the data of the target edge on the mark scale line, thereby improving the accuracy of the electrode misalignment detection.

[0026] In one possible implementation, the first data acquisition device and the second data acquisition device are at the same distance from the winding mechanism.

[0027] In this embodiment of the application, by setting the distances from the first data acquisition device and the second data acquisition device to the winding mechanism to be the same, the first data acquisition device and the second data acquisition device can acquire data located on the same radial direction of the winding mechanism at the same time as much as possible, thereby accurately determining the data of the target edge on the marked scale line.

[0028] In one possible implementation, the data acquisition device is positioned facing the winding surface of the winding mechanism.

[0029] In this embodiment, by aligning the data acquisition device toward the winding surface of the winding mechanism, the data acquisition device can easily acquire first data including the target edge and second data including the marking scale lines, thereby facilitating the detection of the tab misalignment.

[0030] In one possible implementation, the data acquisition device includes a linear array data acquisition device.

[0031] In this embodiment of the application, during the winding process of the electrode assembly, the linear array data acquisition device can continuously acquire data including the target edge and the marking scale lines on the winding mechanism, thereby enabling continuous detection of all tabs of the electrode assembly and comprehensive detection of the misalignment of the tabs.

[0032] In one possible implementation, generating a target image based on first data and second data includes: generating a first target image based on the first data, and generating a second target image based on the second data, wherein the target image includes the first target image and the second target image, the first target image includes a step signal image with the acquisition time as the horizontal axis and whether the target edge was acquired as the vertical axis, and the second target image includes a step signal image with the acquisition time as the horizontal axis and whether the line marking the scale line was acquired as the vertical axis.

[0033] In this embodiment, a step signal image with the acquisition time as the horizontal axis and whether the target edge was acquired as the vertical axis can be generated based on the first data. Similarly, a step signal image with the acquisition time as the horizontal axis and whether the marked scale line was acquired as the vertical axis can be generated based on the second data. Thus, the scale value corresponding to the target edge on the marked scale line can be determined based on the first and second target images, thereby improving the accuracy of electrode detection.

[0034] In one possible implementation, the second data further includes data of the first identifier bit, and the second target image further includes an image of the first identifier bit. The first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, which is the axial direction of the winding mechanism.

[0035] In this embodiment, by setting a marker on the winding mechanism, the start and end times of the second data acquisition device acquiring data of the target edge of the electrode tab can be determined during the winding process of the electrode assembly, within the time interval between two consecutive acquisitions of the first marker by the first data acquisition device. Thus, each layer of the electrode assembly winding can be distinguished in the target image using the first marker, allowing for the detection of the electrode tab misalignment during each layer of winding.

[0036] In one possible implementation, the first identifier is located on the first target radial direction, which is the radial direction other than the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0037] In this embodiment, by setting a first marker on the first target radial direction, it is convenient to determine the target edge data of the electrode collected by the first data acquisition device within the time interval between the second data acquisition device collecting the first marker twice. Thus, the data collected by the first data acquisition device and the data collected by the second data acquisition device can be aligned based on this time interval, so that the target edge collected by the first data acquisition device corresponds to the marker scale line between the two times the second data acquisition device collects the first marker. This allows for accurate determination of the scale value of the target edge corresponding to the marker scale line.

[0038] In one possible implementation, a first identifier is located on a first target radial direction and a second target radial direction. The first target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The second target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are respectively the projection areas of the multilayer first polarity tabs and the multilayer second polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0039] In this embodiment of the application, during the process of winding the electrode assembly once, the data including the scale line collected by the second data acquisition device and the target edge data of the first polarity tab or the second polarity tab collected by the first data acquisition device can be aligned based on the time when the first marker position is collected twice. This makes it easier to align the target edge of the first polarity tab or the second polarity tab with the scale line between the two times the first marker position is collected by the second data acquisition device in the target image, and can accurately determine the scale value corresponding to the scale line of the target edge.

[0040] In one possible implementation, the end of the first marker is disposed on the line of the marker scale along a first direction, the first direction being the circumferential direction of the winding mechanism.

[0041] In this embodiment of the application, the first identifier is set on the line of the mark scale by the end of the first identifier along the circumferential direction of the winding mechanism. Thus, the scale value between the end of the first identifier and the first line of the mark scale can be collected by the first data acquisition device as the scale value between the first two lines of the mark scale. There is no need to estimate or round down (e.g., less than half the scale value is 0, and greater than or equal to half the scale value is a unit scale value), which facilitates the calculation of the tab misalignment and improves the accuracy of the tab misalignment calculation.

[0042] In one possible implementation, a first identifier is located at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism, the opening being for the electrode assembly to be wound, and the winding surface of the winding mechanism including one or two openings along the first direction.

[0043] In this embodiment of the application, by setting the first mark at the opening of the winding surface of the winding mechanism, the possibility of the radial direction of the projection area of ​​the electrode sheet on the winding mechanism coinciding with the first mark can be reduced, so that the radial direction of the projection area of ​​the target edge of the electrode assembly on the winding mechanism coincides with the mark scale line as much as possible, thereby facilitating the determination of the scale corresponding to the target edge on the mark scale line, and thus facilitating the determination of the misalignment amount of the target edge.

[0044] In one possible implementation, the first data further includes data of a second identifier bit, and the second target image includes an image of the second identifier bit. The second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism. The first identifier bit and the second identifier bit are located in the same radial direction of the winding mechanism.

[0045] In this embodiment of the application, by setting a first identifier bit and a second identifier bit, the data collected by the first data acquisition device and the data collected by the second data acquisition device can be aligned in terms of both time and identifier bit. This makes it easier to align the target edge of the electrode of the second data acquisition device with the identifier scale line collected by the first data acquisition device, thereby improving the accuracy of electrode misalignment detection.

[0046] In one possible implementation, determining the scale value corresponding to the target edge on the marked scale line based on the target image includes: determining the target time for acquiring the target edge in the first target image; and using the target scale value corresponding to the target time in the second target image as the scale value corresponding to the target edge on the marked scale line.

[0047] In this embodiment, the moment when the target edge is detected is determined in the first target image, and the corresponding scale value is determined in the first target image. This scale value is then used as the scale value corresponding to the target edge on the marked scale line. Thus, by using the temporal correspondence between the first and second target images, the scale value corresponding to the target edge in the first target image in the second target image can be accurately determined, thereby enabling accurate detection of the electrode misalignment.

[0048] In one possible implementation, before determining the scale value corresponding to the target edge on the marker scale line based on the target image, the detection method further includes: performing compensation processing on the first target image and / or the second target image to align a plurality of second marker bits in the first target image and a plurality of first marker bits in the second target image along the horizontal coordinate.

[0049] In this embodiment, by performing compensation processing on the first target image and / or the second target image, the first and second identifiers acquired multiple times during the winding process of the motor assembly can be aligned along the horizontal coordinates of the first and second target images. This allows for the determination of the corresponding scale value at the same horizontal coordinate position in the second target image based on the position of the target edge along the horizontal coordinate in the first target image, even when the winding mechanism is not wound at a uniform speed and the first and second acquisition devices cannot simultaneously acquire data from the same radial direction of the winding mechanism. Thus, the scale value corresponding to the target edge in the first target image in the second target image can be accurately determined.

[0050] In one possible implementation, the shape of the step signal in the first target image includes a first shape, which includes one or more of bell and / or sawtooth shapes.

[0051] In this embodiment, the shape of the step signal in the first target image includes a bell shape and / or a sawtooth shape, which facilitates the rapid extraction of information such as the edge information of the tab from the vertices of the bell shape and / or the sawtooth shape, thereby facilitating the calculation of the tab misalignment.

[0052] In one possible implementation, the step signal of the first target image includes a signal of the first target shape, the vertices of the first target shape being used to indicate that the data acquisition device has acquired the target edge, and the first target shape being either the first first shape or the last first shape in the first target image between two consecutive acquisitions of the second identifier bit at the target edge.

[0053] In this embodiment of the application, the time corresponding to the vertex of the first first shape or the vertex of the last first shape in the first target image can be used as the time when the target edge of the outermost electrode is acquired. This can determine the target edge of the outermost electrode relatively simply and accurately, thereby enabling the misalignment of the target edge of the outermost electrode to be determined quickly and accurately.

[0054] In one possible implementation, the shape of the step signal in the second target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

[0055] In this embodiment, the shape of the step signal in the second target image includes a bell shape and / or a sawtooth shape, which facilitates the rapid extraction of information such as the information of the lines marking the scale from the vertices of the bell shape and / or sawtooth shape, thereby facilitating the calculation of the misalignment of the tab.

[0056] In one possible implementation, the vertices of the second shape are used to indicate the lines that the data acquisition device has acquired to identify the scale lines.

[0057] In this embodiment of the application, the vertices of the second shape in the second target image can be used to indicate the lines of the acquired marking scale, which can simply and clearly represent the lines of the marking scale and facilitate the calculation of the misalignment of the tab.

[0058] In one possible implementation, the misalignment of the tab is determined based on the scale value corresponding to the target edge on the marked scale line, including: determining the misalignment of the tab based on the difference between the corresponding scale value of the target edge on the marked scale line and the scale value corresponding to the reference scale line, wherein the marked scale line includes the reference scale line.

[0059] In this embodiment of the application, the misalignment of the tab can be accurately calculated based on the difference between the corresponding scale on the marked scale line and the scale corresponding to the reference scale line of the target edge.

[0060] In one possible implementation, a reference scale line is set at the position of the electrode edge of the perfect electrode assembly corresponding to the marked scale line. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode meets the design requirements.

[0061] In this embodiment, the scale value or scale range corresponding to the edge of the tab of the perfect electrode assembly on the marked scale line of the winding mechanism can be determined in advance. Thus, based on the difference between the scale value corresponding to the target edge on the marked scale line and the scale value or scale range of the perfect electrode assembly, the misalignment between the tab of the electrode assembly under test and the tab of the perfect electrode assembly can be accurately determined.

[0062] In one possible implementation, the spacing between adjacent lines of the marking scale is in the range of 50µm-450µm.

[0063] In one possible implementation, the spacing between adjacent lines of the marking scale is in the range of 50µm-200µm.

[0064] In this embodiment of the application, by setting the spacing between adjacent lines of the marking scale within a reasonable range, the processing accuracy requirements of the marking scale can be met, and the detection accuracy of the tab misalignment can be improved.

[0065] In one possible implementation, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm; the sampling frequency of the data acquisition device is greater than or equal to 10 kHz; the diameter of the light spot of the data acquisition device is less than the spacing between adjacent lines of the marking scale; and the detection distance of the data acquisition device is greater than or equal to 50 mm.

[0066] In one possible implementation, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm; the sampling frequency of the data acquisition device is greater than or equal to 20 kHz; the diameter of the light spot of the data acquisition device is less than or equal to 40 μm; and the detection distance of the data acquisition device is in the range of 50 mm to 100 mm.

[0067] In this embodiment, by controlling the detection accuracy of the data acquisition device along the thickness direction of the electrode assembly, the sampling frequency of the data acquisition device, and the diameter of the light spot of the data acquisition device being smaller than the spacing between adjacent lines of the marking scale line within a reasonable range, the detection accuracy can be improved; by controlling the detection distance of the data acquisition device within a reasonable range, it is possible to be compatible with the detection of electrode tab misalignment of electrode assemblies of different models and sizes, thereby improving the applicability of the data acquisition device.

[0068] Secondly, a device for detecting tab misalignment is provided. This device is used to detect the tabs of an electrode assembly during the stacking of electrode assemblies on a stacking mechanism. The device includes: an acquisition unit for acquiring first data and second data acquired by a data acquisition device; the first data includes data on the target edge of the tab; the second data includes data on marking scale lines on the stacking mechanism; the electrode assembly includes tabs; and the target edge includes the edge of the stacked surface of the tab. A processing unit is used to generate a target image based on the first data and the second data; the target image includes images showing whether the target edge was acquired in relation to the acquisition time and whether the marking scale lines were acquired in relation to the acquisition time; determine the scale value corresponding to the target edge on the marking scale lines based on the target image; and determine the tab misalignment based on the scale value corresponding to the target edge on the marking scale lines.

[0069] In one possible implementation, the stacking mechanism includes a winding mechanism and the electrode assembly includes a wound electrode assembly.

[0070] In one possible implementation, the marking scale lines are set along a first direction, which is the circumferential direction of the winding mechanism.

[0071] In one possible implementation, the marking scale lines are disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0072] In one possible implementation, the marking scale line is set on the winding surface of the first end of the winding mechanism along a second direction, where the second direction is the axial direction of the winding mechanism and the first end is the end away from the tab.

[0073] In one possible implementation, the marking scale lines consist of equally spaced scale lines.

[0074] In one possible implementation, the target edge includes the edge of at least one end of the stacked surface of the target tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target tab being the outermost tab of the electrode assembly during the winding process.

[0075] In one possible implementation, the acquisition unit is used to acquire first data acquired by a first data acquisition device and second data acquired by a second data acquisition device, wherein the data acquisition device includes a first data acquisition device and a second data acquisition device.

[0076] In one possible implementation, the first data acquisition device and the second data acquisition device can simultaneously acquire data along the same radial direction of the winding mechanism.

[0077] In one possible implementation, the first data acquisition device and the second data acquisition device are positioned in a third direction, where the third direction is any radial direction of the winding mechanism.

[0078] In one possible implementation, the first data acquisition device and the second data acquisition device are at the same distance from the winding mechanism.

[0079] In one possible implementation, the data acquisition device is positioned facing the winding surface of the winding mechanism.

[0080] In one possible implementation, the data acquisition device includes a linear array data acquisition device.

[0081] In one possible implementation, the processing unit is configured to generate a first target image based on first data and a second target image based on second data, wherein the target image includes the first target image and the second target image, the first target image includes a step signal image with the acquisition time as the horizontal axis and whether the target edge was acquired as the vertical axis, and the second target image includes a step signal image with the acquisition time as the horizontal axis and whether the line marking the scale line was acquired as the vertical axis.

[0082] In one possible implementation, the second data further includes data of the first identifier bit, and the second target image further includes an image of the first identifier bit. The first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, which is the axial direction of the winding mechanism.

[0083] In one possible implementation, the first identifier is located on the first target radial direction, which is the radial direction other than the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0084] In one possible implementation, a first identifier is located on a first target radial direction and a second target radial direction. The first target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The second target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are respectively the projection areas of the multilayer first polarity tabs and the multilayer second polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0085] In one possible implementation, the end of the first marker is disposed on the line of the marker scale along a first direction, the first direction being the circumferential direction of the winding mechanism.

[0086] In one possible implementation, a first identifier is located at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism, the opening being for the electrode assembly to be wound, and the winding surface of the winding mechanism including one or two openings along the first direction.

[0087] In one possible implementation, the first data further includes data of a second identifier bit, and the second target image includes an image of the second identifier bit. The second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism. The first identifier bit and the second identifier bit are located in the same radial direction of the winding mechanism.

[0088] In one possible timing configuration, the processing unit is configured to perform compensation processing on the first target image and / or the second target image to align a plurality of second identifier bits in the first target image with a plurality of first identifier bits in the second target image along the horizontal coordinate.

[0089] In one possible implementation, the processing unit is configured to: determine the target time for acquiring the target edge in the first target image; and use the target scale value corresponding to the target time in the second target image as the scale value corresponding to the target edge on the marked scale line.

[0090] In one possible implementation, the shape of the step signal in the first target image includes a first shape, which includes one or more of bell and / or sawtooth shapes.

[0091] In one possible implementation, the step signal of the first target image includes a signal of the first target shape, the vertices of the first target shape being used to indicate that the data acquisition device has acquired the target edge, and the first target shape being either the first first shape or the last first shape in the first target image between two consecutive acquisitions of the second identifier bit at the target edge.

[0092] In one possible implementation, the shape of the step signal in the second target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

[0093] In one possible implementation, the vertices of the second shape are used to indicate the lines that the data acquisition device has acquired to identify the scale lines.

[0094] In one possible implementation, the processing unit is used to determine the misalignment of the tab based on the difference between the corresponding scale on the marked scale line and the corresponding scale on the reference scale line of the target edge, wherein the marked scale line includes the reference scale line.

[0095] In one possible implementation, a reference scale line is set at the position of the electrode edge of the perfect electrode assembly corresponding to the marked scale line. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode meets the design requirements.

[0096] In one possible implementation, the spacing between adjacent lines of the marking scale is in the range of 50µm-450µm.

[0097] In one possible implementation, the spacing between adjacent lines of the marking scale is in the range of 50µm-200µm.

[0098] In one possible implementation, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm; the sampling frequency of the data acquisition device is greater than or equal to 10 kHz; the diameter of the light spot of the data acquisition device is less than the spacing between adjacent lines of the marking scale; and the detection distance of the data acquisition device is greater than or equal to 50 mm.

[0099] In one possible implementation, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm; the sampling frequency of the data acquisition device is greater than or equal to 20 kHz; the diameter of the light spot of the data acquisition device is less than or equal to 40 μm; and the detection distance of the data acquisition device is in the range of 50 mm to 100 mm.

[0100] Thirdly, a device for detecting tab misalignment is provided, the device comprising a memory and a processor, the memory for storing instructions, and the processor for reading instructions and executing a detection method as described in the first aspect or any possible implementation thereof.

[0101] Fourthly, a computer program is provided that, when executed by a computer, causes the computer to implement the detection method as described in the first aspect or any possible implementation thereof.

[0102] Fifthly, a computer-readable storage medium is provided for storing a computer program that, when executed by a computer, causes the computer to implement the detection method as described in the first aspect or any possible implementation thereof.

[0103] In a sixth aspect, a computer program product is provided, including computer program instructions that, when executed by a computer, cause the computer to implement the detection method as described in the first aspect or any possible implementation thereof. Attached Figure Description

[0104] Figure 1 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0105] Figure 2 is a schematic diagram of a simplified structure of the wound electrode assembly provided in an embodiment of this application.

[0106] Figure 3 is a schematic diagram of detecting the amount of tab misalignment during the electrode winding process provided in an embodiment of this application.

[0107] Figure 4 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0108] Figure 5 is a schematic diagram of the first target image and the second target image provided in the embodiments of this application.

[0109] Figure 6 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0110] Figure 7 is a schematic diagram of the first target radial direction on the winding mechanism provided in the embodiment of this application.

[0111] Figure 8 is a schematic diagram of the first target radial direction and the second target radial direction on the winding mechanism provided in the embodiment of this application.

[0112] Figure 9 is a schematic diagram of the first target image and the second target image provided in the embodiments of this application.

[0113] Figure 10 is a schematic block diagram of the electrode misalignment detection device provided in an embodiment of this application.

[0114] Figure 11 is another schematic block diagram of the electrode misalignment detection device provided in the embodiments of this application. Detailed Implementation

[0115] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0116] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0117] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0118] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0119] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0120] To meet battery performance and lifespan requirements, the position of the tabs in the battery electrode assembly must conform to design specifications; that is, the misalignment of the tabs must also meet design requirements. For example, in a wound electrode assembly, excessive tab misalignment—meaning the tabs deviate significantly from the design specifications—may prevent the welding machine from accurately aligning the tabs and leads, resulting in weak welds or even detachment. It may also reduce the distance between the positive and negative tabs, posing a short-circuit risk to the battery. Currently, the methods used to detect tab misalignment during the electrode assembly winding process result in significant discrepancies between the detected and actual misalignment. This is especially problematic after hot pressing of the electrode assembly, where the tab position deviates severely from the design specifications, potentially leading to a large number of scrapped products.

[0121] To address the aforementioned issues, this application provides a method and apparatus for detecting tab misalignment. The method, used to detect tabs on electrode assemblies during the stacking process in a stacking mechanism, includes: acquiring first data and second data collected by a data acquisition device; the first data including data on the target edge of the tab, and the second data including data on marking scale lines on the stacking mechanism; the target edge including the edge of the stacking surface of the tab; generating a target image based on the first and second data; the target image including whether the relationship between the target edge and acquisition time was captured, and whether the relationship between the marking scale lines and acquisition time was captured; determining the scale value corresponding to the target edge on the marking scale line based on the target image; and determining the tab misalignment based on the scale value corresponding to the target edge on the marking scale line.

[0122] The tab detection method and detection device provided in this application can collect data including the target edge of the tab and the marked scale lines on the stacking mechanism by a data acquisition device to generate a target image including the target edge and the marked scale lines changing with the data acquisition time, and determine the scale value corresponding to the target edge on the marked scale line based on the target image, thereby detecting the misalignment of the tab, which can improve the accuracy and precision of the detection.

[0123] The following is an exemplary description of the method for detecting tab misalignment provided in the embodiments of this application, with reference to Figures 1 to 8.

[0124] Figure 1 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0125] This detection method is used to detect the tabs of the electrode assembly during the process of stacking electrode assemblies on a stacking mechanism, and the detection method includes some or all of the following.

[0126] 110, acquire the first and second data collected by the data acquisition device.

[0127] The first data includes data on the target edge of the electrode, and the second data includes data on the marking lines on the stacking mechanism. The target edge includes the edge of the stacking surface of the electrode.

[0128] Electrode assemblies may include stacked electrode assemblies or wound electrode assemblies, etc.

[0129] The stacking mechanism may include a stacking table or a winding mechanism such as a winding needle. Stacked electrode assemblies can be stacked on a stacking table. Winded electrode assemblies can be wound on a winding mechanism.

[0130] During the stacking process of electrode assemblies, such as during winding or lamination, the electrode sheets of the electrode assembly are also stacked layer by layer. For example, in a wound electrode assembly, the outer electrode sheets are stacked on top of the adjacent inner electrode sheets, just as in a laminated electrode assembly, the upper electrode sheets are stacked on top of the adjacent lower electrode sheets.

[0131] The stacking surface of a wound electrode assembly can be understood as the inner and outer surfaces of the electrode sheet of the wound electrode assembly, while the stacking surface of a laminated electrode assembly can be understood as the upper and lower surfaces of the electrode sheet of the laminated electrode assembly.

[0132] The target edge of the tab can include any edge of the stacked surface of the electrode assembly. For example, the root of the tab is connected to the electrode sheet. During detection, the root of the tab may not be easily distinguishable from the electrode sheet. Therefore, other edges besides the edge of the tab root can be used as the target edge.

[0133] For example, marking lines can be set on the lamination mechanism along the direction of electrode misalignment. Generally speaking, misalignment of the tab along the length of the electrode sheet more clearly reflects the misalignment of the tab. Therefore, marking lines can be set on the lamination mechanism along the length of the electrode sheet, or on the winding mechanism along the length of the electrode sheet (during the winding process, the length of the electrode sheet becomes the winding direction of the electrode sheet).

[0134] The marking scale lines can be a series of measurement lines with a spacing of D1. The marking scale lines can be set on the stacked mechanism in different ways, such as etching the marking scale lines on the stacked mechanism or pasting the marking scale lines on the stacked mechanism.

[0135] As an example, data acquisition devices may include sensors, image acquisition devices such as laser sensors, cameras, and so on.

[0136] 120. Generate the target image based on the first and second data.

[0137] The target image includes images showing the relationship between whether the target edge was captured and the acquisition time, as well as images showing the relationship between the marker scale lines and the acquisition time.

[0138] For example, the target image could be an image of whether the target edge and the marked scale lines were captured during the winding process of the wound electrode assembly, from time T1 to time T2. That is, the horizontal axis of the target image can be the acquisition time, and the vertical axis of the target image can be whether the target edge and the marked scale lines were captured.

[0139] 130. Based on the target image, determine the scale value corresponding to the target edge on the marked scale line.

[0140] As an example, in the target image, the acquisition time corresponding to the target edge is t1, and the reading of the marker scale line corresponding to t1 can be used as the scale value of the target edge on the marker scale line.

[0141] During detection, the target edge may lie between two lines on the marked scale. In this case, the scale reading can be estimated; alternatively, the scale value of the line closer to the target edge can be used as the scale value corresponding to the target edge on the marked scale.

[0142] For example, if the spacing between the marking lines is 200μm, the target edge can be between 600μm and 800μm of the marking line, allowing for estimation of the reading, such as 680 micrometers; or, if the target edge is closer to the 600-micrometer marking line, 600μm can be used as the corresponding marking value of the target edge on the marking line.

[0143] 140. Determine the misalignment of the tab based on the scale value corresponding to the target edge on the marked scale line.

[0144] In some embodiments, the misalignment of the tab can refer to the misalignment between the target edge of the tab of the electrode assembly under test and the target edge of the tab of the perfect electrode assembly.

[0145] As an example, the misalignment between the target edge of the electrode assembly under test (DUT) and the target edge of the perfect electrode assembly can be determined based on the scale value corresponding to the target edge of the DUT's tab on the marked scale line. For instance, the scale value corresponding to the target edge of the DUT's tab on the marked scale line can be used as the misalignment between the DUT's tab and the perfect electrode assembly. As another example, a certain value can be subtracted from the target edge of the DUT's tab to obtain the misalignment between the DUT's tab and the perfect electrode assembly.

[0146] In this application, a perfect electrode assembly can be understood as an electrode assembly whose tab position meets the design requirements.

[0147] In some embodiments, the misalignment of the tabs can refer to the misalignment between adjacent tabs of the electrode assembly under test. For example, the misalignment of the tabs can be determined based on the scale values ​​corresponding to the target edges of adjacent tabs of the electrode assembly under test on the marked scale lines.

[0148] In some embodiments, the misalignment of the tabs can refer to the misalignment between the target edge of the tabs outside the first layer of the electrode assembly under test and the target edge of the tabs in the first layer. For example, the misalignment of the tabs can be determined based on the scale values ​​corresponding to the target edges of the tabs in each layer outside the first layer of the electrode assembly under test and the target edge of the tabs in the first layer on the marked scale line.

[0149] In this embodiment of the application, a target image can be generated by collecting data including the target edge of the tab and the marked scale lines on the stacking mechanism using a data acquisition device. The scale value corresponding to the target edge on the marked scale line can be determined based on the target image, thereby detecting the misalignment of the tab and improving the accuracy and precision of the detection.

[0150] In some embodiments, the stacked structure includes a winding mechanism and the electrode assembly includes a wound electrode assembly.

[0151] The winding mechanism may include a winding needle, etc. The winding mechanism is used to wind the electrode assembly.

[0152] As shown in Figure 2, each layer of the wound electrode assembly includes, from the outside in, a diaphragm, an anode electrode, a diaphragm, and a cathode electrode. The wound electrode assembly shown in Figure 2 is obtained by winding the electrodes and diaphragms along the winding axis of the winding mechanism and then cold-pressing them.

[0153] As shown in Figure 3, the anode tab is connected to the anode plate of each layer, and the cathode tab is connected to the cathode plate of each layer.

[0154] In this embodiment of the application, a first data including the target edge of the tab of the wound electrode assembly and a second data including the marking scale line on the winding mechanism can be collected by the data acquisition device, and a target image can be generated. The scale value corresponding to the target edge on the marking scale line can be determined according to the target image, thereby detecting the tab misalignment of the wound electrode assembly, which can improve the accuracy and precision of the tab misalignment detection of the wound electrode assembly.

[0155] In some embodiments, the marking scale lines are arranged along a first direction, which is the circumferential direction of the winding mechanism.

[0156] As shown in Figure 3, the marking scale lines are set along the circumference of the winding mechanism.

[0157] The misalignment of the tabs along the length of the electrode sheet more clearly reflects the misalignment of the tabs. Therefore, marking scale lines can be set on the winding mechanism along the length of the electrode sheet (during the winding process, the length of the electrode sheet becomes the winding direction of the electrode sheet, that is, the circumferential direction of the winding mechanism).

[0158] In this embodiment of the application, the misalignment of the electrode tab is detected by setting marking scale lines along its circumference on the winding mechanism, which can clearly reflect the misalignment of the electrode tab.

[0159] In some embodiments, the marking scale lines are disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0160] The winding mechanism includes two ends along the second direction, as shown in Figure 3, namely the left end and the right end. Marking scale lines can be set at the left end and / or the right end of the winding surface of the winding mechanism.

[0161] In this embodiment of the application, by setting the marking scale line on the winding surface of at least one end of the winding mechanism along the axial direction of the winding mechanism, the data of the marking scale line can be collected more clearly by the data acquisition device, thereby improving the accuracy of the tab misalignment detection.

[0162] In some embodiments, the marking scale line is disposed on the winding surface of the first end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism, and the first end being the end away from the tab.

[0163] For example, as shown in Figure 3, the winding surface of the winding mechanism along its circumference and away from the tab is the winding surface of the left end of the winding mechanism, and the marking scale line can be set on the winding surface of the left end of the winding mechanism.

[0164] In this embodiment, the marking scale line can be set on the winding surface of the winding mechanism along its axial direction and away from the electrode tab, so that the data of the target edge of the electrode tab and the data of the marking scale line do not interfere with each other when collecting data, the data of the target edge and the data of the marking scale line can be accurately collected, thereby generating an accurate target image, and thus accurately detecting the misalignment of the electrode assembly.

[0165] In some embodiments, as shown in FIG3, the marking scale lines include equally spaced scale lines.

[0166] In this embodiment of the application, by setting the marking scale lines to equally spaced scale lines, it is convenient to calculate the scale value of the target edge at the corresponding marking scale line.

[0167] In some embodiments, as shown in FIG3, the target edge includes the edge of at least one end of the stacked surface of the target tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target tab being the outermost tab of the electrode assembly during the winding process.

[0168] In Figure 3, the upper and lower edges of each tab are the edges of the stacked surface of the tab in the first direction.

[0169] During the winding process of the wound electrode assembly, the data acquisition device can collect data on the target edge of the electrode tab of each winding layer, thereby detecting the misalignment of the electrode tab of that layer.

[0170] As shown above, the misalignment of the tab along the length of the electrode sheet more clearly reflects the misalignment of the tab. Therefore, the amount of misalignment of the tab along the length of the electrode sheet (during the winding process, the length of the electrode sheet becomes the winding direction of the electrode sheet, i.e., the circumferential direction of the winding mechanism) can be detected.

[0171] In this embodiment of the application, by detecting the misalignment of the lamination surface of the tab along the circumferential edge of the winding mechanism, the misalignment of the tab can be more clearly reflected, thereby improving the accuracy of the tab misalignment detection.

[0172] In some embodiments, two data acquisition devices can be used to acquire data of the target edge and the marker scale lines respectively. The following, with reference to Figure 4, provides an exemplary description of a method for detecting tab misalignment when using two acquisition devices to acquire data of the target edge and the marker scale lines respectively.

[0173] Figure 4 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0174] This detection method is used to detect the tabs of an electrode assembly during the stacking of electrode assemblies on a stacking mechanism. This may include a winding mechanism and a wound electrode assembly.

[0175] 410, acquire the first data acquired by the first data acquisition device and the second data acquired by the second data acquisition device.

[0176] The first data includes data on the target edge of the electrode, and the second data includes data on the marking scale lines. The target edge includes the edge of the stacked surface of the electrode.

[0177] As shown in Figure 3, the first data acquisition device can be used to collect data on the target edge of the electrode, and the second data acquisition device can be used to collect data on the marking scale lines.

[0178] In this embodiment, a first data acquisition device can be used to acquire data of the target edge of the electrode tab, and a second data acquisition device can acquire data of the marking scale lines. The two data acquisition devices do not interfere with each other when acquiring data, and can accurately acquire data of the target edge and data of the marking scale lines to generate a target image in which the data of the target edge and the data of the marking scale lines do not interfere with each other, thereby enabling accurate detection of the misalignment of the electrode assembly.

[0179] In some embodiments, the first data acquisition device and the second data acquisition device may simultaneously acquire data along the same radial direction of the winding mechanism.

[0180] The first and second data acquisition devices can simultaneously acquire data along the same radial direction of the winding mechanism. This can be understood as the data acquired by the first and second data acquisition devices at the same time being located on the same radial direction of the winding structure. For example, the first data acquisition device can acquire data of the tabs located on a certain radial direction of the winding mechanism, and the second data acquisition device can acquire data of the marking scale lines located on that radial direction.

[0181] Because the angular velocity of the winding process in a wound electrode assembly may change, if the first and second data acquisition devices cannot simultaneously acquire data along the same radial direction of the winding mechanism, it is impossible to determine the scale value acquired by the other data acquisition device at the moment the first data acquisition device acquires the target edge. Therefore, it is impossible to accurately determine the scale value corresponding to the target edge on the marked scale line. Thus, in order to accurately determine the scale value of the target edge on the marked scale line, the first and second data acquisition devices need to be able to simultaneously acquire data along the same radial direction of the winding mechanism.

[0182] In this embodiment, the first data acquisition device and the second data acquisition device can simultaneously acquire data located on the same radial direction of the winding mechanism. Based on the time when the first data acquisition device acquires the target edge, the scale value acquired by the second data acquisition device at that time can be accurately determined, and this scale value can be used as the scale value corresponding to the target edge on the marked scale line. This allows for accurate determination of the scale value of the target edge on the marked scale line, thereby improving the accuracy of the tab misalignment detection.

[0183] For example, the first data acquisition device and the second data acquisition device are disposed in a third direction, which is any radial direction of the winding mechanism.

[0184] In other words, the first data acquisition device and the second data acquisition device are located on the same radial direction of the winding mechanism.

[0185] For example, as shown in Figure 3, both the first and second data acquisition devices are positioned directly above the winding mechanism, i.e., both are positioned radially upwards from the winding mechanism. It should be understood that the radial direction shown in Figure 4 is one of multiple radial directions of the winding mechanism.

[0186] Furthermore, in Figure 3, the first data acquisition device is located at the left end of the winding surface of the winding mechanism to acquire the marking scale line located at the left end of the winding surface of the winding mechanism; the second data acquisition device is located at the right end of the winding surface of the winding mechanism to acquire the target edge of the tab located at the right end of the winding surface of the winding mechanism.

[0187] In this embodiment of the application, the first data acquisition device and the second data acquisition device are arranged on the same radial direction of the winding mechanism, so that the first data acquisition device and the second data acquisition device can acquire data on the same radial direction of the winding mechanism at the same time as much as possible, thereby accurately determining the data of the target edge on the mark scale line, thereby improving the accuracy of the electrode misalignment detection.

[0188] For example, as shown in FIG3, the distances from the first data acquisition device and the second data acquisition device to the winding mechanism are the same.

[0189] For example, as shown in Figure 3, both the first data acquisition device and the second data acquisition device are positioned directly above the winding mechanism. Furthermore, the distance from the first data acquisition device to the winding mechanism and the distance from the second data acquisition device to the winding mechanism are the same.

[0190] In this embodiment of the application, by setting the distances from the first data acquisition device and the second data acquisition device to the winding mechanism to be the same, the first data acquisition device and the second data acquisition device can acquire data located on the same radial direction of the winding mechanism at the same time as much as possible, thereby accurately determining the data of the target edge on the marking scale line.

[0191] In some embodiments, the data acquisition device is positioned toward the winding surface of the winding mechanism.

[0192] As shown in Figure 3, the data acquisition device faces the winding surface of the winding mechanism. For example, both the first and second data acquisition devices face the winding surface of the winding mechanism.

[0193] In this embodiment, by aligning the data acquisition device toward the winding surface of the winding mechanism, the data acquisition device can easily acquire first data including the target edge and second data including the marking scale lines, thereby facilitating the detection of the tab misalignment.

[0194] In some embodiments, the data acquisition device includes a linear array data acquisition device.

[0195] For example, both the first data acquisition device and the second data acquisition device are linear array data acquisition devices, such as linear array cameras.

[0196] In this embodiment of the application, during the winding process of the electrode assembly, the linear array data acquisition device can continuously acquire data including the target edge and the marking scale lines on the winding mechanism, thereby enabling continuous detection of all tabs of the electrode assembly and comprehensive detection of the misalignment of the tabs.

[0197] 420, Generate a first target image based on the first data and generate a second target image based on the second data.

[0198] The target image includes a first target image and a second target image. The first target image includes a step signal image with time as the horizontal axis and whether the edge of the target was captured as the vertical axis. The second target image includes a step signal image with time as the horizontal axis and whether the line of the marker scale was captured as the vertical axis.

[0199] For example, Figure 5(a) and (b) are the first target image and the second target image, respectively. The first target image includes multiple serrated edges, and the vertex of each serrated edge represents the target edge of the electrode acquired by the first data acquisition device. The second target image includes multiple serrated edges, and the vertex of each serrated edge represents the line of the marking scale acquired by the second data acquisition device.

[0200] In Figure 5, the first target image is an image generated by collecting data including the target edge within the time range of T1 to T2, and the second target image is an image generated by collecting data of the marked scale lines within the time range of T1 to T2.

[0201] In this embodiment, the first data acquisition device acquires first data and generates a step signal image with the acquisition time on the horizontal axis and whether the target edge was acquired on the vertical axis. The second data acquisition device acquires second data and generates a step signal image with the acquisition time on the horizontal axis and whether the marked scale line was acquired on the vertical axis. Thus, based on the first and second target images, the scale value corresponding to the target edge on the marked scale line can be determined, thereby improving the accuracy of electrode detection.

[0202] 430. Based on the target image, determine the scale value corresponding to the target edge on the marked scale line.

[0203] 440. Determine the misalignment of the tab based on the scale value corresponding to the target edge on the marked scale line.

[0204] The contents of steps 430 and 440 can be found in the relevant contents of steps 130 and 140, and will not be repeated here.

[0205] In some embodiments, determining the scale value corresponding to the target edge on the marked scale line based on the target image includes: determining the target time when the target edge was detected in the first target image; and using the target scale value corresponding to the target time in the second target image as the scale value corresponding to the target edge on the marked scale line.

[0206] The following, in conjunction with Figure 6, provides an exemplary description of the above-mentioned determination of the target time in the first target image and the use of the target scale value corresponding to the target time in the second target image as the scale value corresponding to the target edge on the marked scale line.

[0207] Figure 6 is a flowchart illustrating the method for detecting tab misalignment provided in an embodiment of this application.

[0208] This detection method is used to detect the tabs of an electrode assembly during the stacking of electrode assemblies on a stacking mechanism. This may include a winding mechanism and a wound electrode assembly.

[0209] 610, acquire the first data acquired by the first data acquisition device and the second data acquired by the second data acquisition device.

[0210] The first data includes data on the target edge of the electrode, and the second data includes data on the marking lines on the winding mechanism. The target edge includes the edge of the stacked surface of the electrode.

[0211] 620, Generate a first target image based on the first data and generate a second target image based on the second data.

[0212] The first target image includes a step signal image with the horizontal axis representing the acquisition time and the vertical axis representing whether the target edge was acquired. The second target image includes a step signal image with the horizontal axis representing the acquisition time and the vertical axis representing whether the marked scale line was acquired.

[0213] Some details of steps 610 and 620 can be found in the relevant descriptions in steps 610 and 620, and will not be repeated here.

[0214] In some embodiments, the second data further includes data of the first identifier bit, and the second target image includes an image of the first identifier bit, wherein the first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0215] In other words, during the winding process of the wound electrode assembly, a data acquisition device is used to collect first data and second data. The first data includes data of the target edge of the electrode tab, and the second data includes data of the marking scale line and the first marking position.

[0216] For example, as shown in Figure 2, the left side of the winding surface of the winding mechanism is provided with a scale line and a first identifier. During the winding process of the electrode assembly, the data acquisition device can collect data from the scale line and the first identifier.

[0217] In this embodiment, the time interval between the first data acquisition device acquiring the first identifier twice can be used as the start and end times for the second data acquisition device to acquire data on the target edge of the electrode tab when the electrode assembly winds one layer of electrode sheet. For example, in Figure 5, the first target image is the image generated by the first data acquisition device acquiring data including the target edge within the time range T1 to T2, and the second target image is the image generated by the second data acquisition device acquiring data on the marker scale lines within the time range T1 to T2.

[0218] In this embodiment, by setting a marker on the winding mechanism, the starting and ending times of the second data acquisition device acquiring data of the target edge of the electrode tab can be determined during the winding process of the electrode assembly, within the time interval between two consecutive acquisitions of the first marker by the first data acquisition device. Thus, each layer of the electrode assembly winding can be distinguished in the target image using the first marker, allowing for the detection of the electrode tab misalignment during each layer of winding.

[0219] In some embodiments, as shown in FIG7, a first identifier is disposed on a first target radial direction. The first target radial direction is a radial direction other than the radial direction of the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0220] As an example, the first polarity tab includes either a positive tab or a negative tab.

[0221] As an example, the positive and negative electrodes of the electrode assembly can be located at opposite ends along its axial direction. For one end, there is only one type of multi-layered electrode with a single polarity, i.e., multiple layers of first polarity electrodes. In this case, two sets of data acquisition devices, two sets of first identifiers, and two sets of identifier scales can be set up to detect the electrodes at both ends separately.

[0222] As an example, the range of the projection area of ​​the multi-layer first polarity tabs of the electrode assembly under test on the winding mechanism can be estimated. For example, a certain range can be extended outward from the projection area of ​​the multi-layer first polarity tabs of the perfect motor assembly on the winding mechanism as the first projection area. The extended range can be determined based on empirical values ​​of tab misalignment. For example, along the circumference of the winding mechanism, the area where the multi-layer first polarity tabs of the electrode assembly under test will not project can be determined based on empirical values, and a first marker position can be set on the winding surface corresponding to any position in this non-projection area.

[0223] In this embodiment, by setting a first marker on the first target radial direction, it is convenient to determine the target edge data of the electrode collected by the first data acquisition device within the time interval between the second data acquisition device collecting the first marker twice. Thus, the data collected by the first data acquisition device and the data collected by the second data acquisition device can be aligned based on this time interval, so that the target edge of the first data acquisition device corresponds to the marker scale line between the two times the second data acquisition device collects the first marker. This allows for accurate determination of the scale value corresponding to the marker scale line of the target edge.

[0224] In some embodiments, as shown in FIG8, a first identifier is disposed on a first target radial direction and a second target radial direction. The first target radial direction is a radial direction other than the radial direction where the first projection area and the second projection area on the winding mechanism are located. The second target radial direction is a radial direction other than the radial direction where the first projection area and the second projection area on the winding mechanism are located. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are respectively the projection areas of the multilayer first polarity tabs and the multilayer second polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0225] As an example, the positive and negative tabs of the electrode assembly can both be located on one end of the electrode assembly along its axial direction. In this case, during the winding process of the electrode assembly, the amount of tab misalignment of the electrode assembly can be detected using a set of data acquisition devices (such as two data acquisition devices), a set of marking scale lines, and two first marking positions provided in the embodiments of this application.

[0226] In other words, in this embodiment, two first identifier positions can be provided on the winding mechanism. As shown in Figure 9, both first identifier positions are located between the first projection area and the second projection area. In a clockwise direction, the first projection area, one first identifier position, the second projection area, and the other first identifier position are arranged in sequence.

[0227] During the time interval between the second data acquisition device sequentially acquiring the first first identifier bit and the second first identifier bit, the first data acquisition device acquires data of the target edge of at least one layer of first polarity tabs; then, during the time interval between the second data acquisition device sequentially acquiring the second first identifier bit and the first first identifier bit, the second data acquisition device acquires data of the target edge of at least one layer of second polarity tabs. And so on.

[0228] Thus, within a first time interval determined based on the first identifier, the target edge of the first polarity tab is determined to lie on the marked scale line using a first target image generated from data collected by the first data acquisition device including the target edge of the first polarity tab, and a second target image generated from data collected by the second data acquisition device including the marked scale line. Within a second time interval determined based on the first identifier, the target edge of the second polarity tab is determined to lie on the marked scale line using a first target image generated from data collected by the first data acquisition device including the target edge of the second polarity tab, and a second target image generated from data collected by the second data acquisition device including the marked scale line. This process continues.

[0229] In this way, during the process of winding the electrode assembly once, the data collected by the second data acquisition device, including the scale line, and the data of the target edge of the first polarity tab or the second polarity tab collected by the first data acquisition device can be aligned based on the two times the first marker position is acquired. This makes it easy to align the target edge of the first polarity tab or the second polarity tab with the scale line between the two times the first marker position is acquired by the second data acquisition device in the target image, and can accurately determine the scale value corresponding to the scale line of the target edge.

[0230] In some embodiments, on the winding surface of the winding mechanism, the first identifier may be a point, or it may be a line such as an arc along the circumference of the winding mechanism, or it may be a curved surface.

[0231] In some embodiments, the end of the first identifier position along a first direction is disposed on the line of the identifier scale line, and the first direction is the circumferential direction of the winding mechanism.

[0232] For example, as shown in Figure 2, the position of a certain line of the marking scale is the endpoint of the first marking position along the circumference of the winding mechanism.

[0233] In this embodiment, the first identifier is set on the line of the scale line along the circumferential end of the winding mechanism. This allows the first data acquisition device to collect the scale value between the end of the first identifier and the first line of the scale line, which is the scale value between the first two lines of the scale line. This eliminates the need for estimation or rounding (e.g., less than half the scale value is 0, and greater than or equal to half the scale value is a unit scale value), facilitating the calculation of the tab misalignment and improving the accuracy of the tab misalignment calculation.

[0234] In some embodiments, a first identifier is disposed at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism, the opening being for winding the electrode assembly, and the winding surface of the winding mechanism including one or two openings along the first direction.

[0235] The winding surface of the winding mechanism includes one opening or two opposing openings. For example, in Figure 7 or Figure 8, the winding surface of the winding mechanism may include two openings. Alternatively, the winding surface of the winding mechanism may include one of the openings shown in Figure 7 or Figure 8.

[0236] In this embodiment of the application, by setting the first mark at the opening of the winding surface of the winding mechanism, the possibility of the radial direction of the projection area of ​​the electrode sheet on the winding mechanism coinciding with the first mark can be reduced, so that the radial direction of the projection area of ​​the target edge of the electrode assembly on the winding mechanism coincides with the mark scale line as much as possible, thereby facilitating the determination of the scale corresponding to the target edge on the mark scale line, and thus facilitating the determination of the misalignment amount of the target edge.

[0237] In some embodiments, the first data further includes data of a second identifier bit, the second target image includes an image of the second identifier bit, the second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism, and the first identifier bit and the second identifier bit are located on the same radial direction of the winding mechanism.

[0238] The number of first and second identifiers is the same and they are located on the same radial direction of the winding mechanism. For example, two first identifiers are respectively located on the first and second target radial directions of the winding mechanism and on the left end of the winding surface along the second direction axial direction, and two second identifiers are also respectively located on the first and second target radial directions of the winding mechanism and on the right end of the winding surface along the second direction axial direction.

[0239] That is, in this embodiment, the first data acquisition device is used to acquire data of the second identifier and the target edge, and the second data acquisition device is used to acquire data of the first identifier and the identifier scale line.

[0240] When the first data acquisition device acquires the second identifier twice, the second data acquisition device acquires the first identifier twice. That is, while the first data acquisition device is acquiring the second identifier, the target edge of the electrode, and the second identifier, the second data acquisition device is acquiring the first identifier, the identifier scale line, and the second identifier.

[0241] In this embodiment of the application, by setting a first identifier bit and a second identifier bit, the data collected by the first data acquisition device and the data collected by the second data acquisition device can be aligned in terms of both time and identifier bit. This makes it easier to align the target edge of the electrode of the second data acquisition device with the identifier scale line collected by the first data acquisition device, thereby improving the accuracy of electrode misalignment detection.

[0242] 630, determine the target time for acquiring the target edge in the first target image.

[0243] 640, take the target scale value in the second target image corresponding to the target time as the scale value of the target edge on the marked scale line.

[0244] For example, in Figure 5(a), the target time at which the target edge is detected in the first target image can be determined, and then in Figure 5(b), the scale value corresponding to the target time in the second target image can be determined. The target time at which the target edge is detected in the first target image is tn, and the scale value corresponding to time tn in the second target image is determined to be before Nn. Since this corresponding scale value is closer to Nn, the scale value corresponding to the target edge can be considered to be Nn.

[0245] For example, in Figure 5, at time T1, the second data acquisition device and the first data acquisition device respectively acquire data of the first identifier and the winding surface (or the second identifier) ​​of the winding mechanism in the same radial direction as the first identifier. At time T2, the second data acquisition device and the first data acquisition device respectively acquire data of the first identifier and the winding surface (or the second identifier) ​​of the winding mechanism in the same radial direction as the first identifier again.

[0246] In this embodiment, the moment when the target edge is detected is determined in the first target image, and the corresponding scale value is determined in the first target image. This scale value is then used as the scale value corresponding to the target edge on the marked scale line. Thus, by using the temporal correspondence between the first and second target images, the scale value corresponding to the target edge in the first target image in the second target image can be accurately determined, thereby enabling accurate detection of the electrode misalignment.

[0247] In this embodiment of the application, before step 630, the first target image and / or the second target image may be compensated so that the plurality of second identifier bits in the first target image and the plurality of first identifier bits in the second target image are aligned along the horizontal coordinate.

[0248] Due to errors in the placement of the data acquisition devices, the first and second data acquisition devices cannot simultaneously acquire data on the same radial direction of the electrode assembly, such as when the first and second data acquisition devices are placed on different radial directions of the winding mechanism.

[0249] Alternatively, in some cases, the first and second data acquisition devices cannot simultaneously acquire data on the same radial direction of the electrode assembly, and the rotational speed of the winding mechanism is uneven during the winding of the electrode assembly.

[0250] The above two situations can cause the first target image generated by the data acquired by the first data acquisition device and the second target image generated by the data acquired by the second data acquisition device to be out of sync in time. For example, the time required for the first data acquisition device to acquire data within a certain range when the winding electrode assembly is wound to the Nth turn is different from that required for the second data acquisition device to acquire data within the same certain range when the winding electrode assembly is wound to the same turn, such as different start and end times, or different durations, etc.

[0251] Therefore, under the above circumstances, it is necessary to align the multiple second identifiers in the first target image and the multiple first identifiers in the second target image along the horizontal axis. For example, the time interval between the sequential acquisition of two second identifiers in the first target image is T2-T1, and the time interval between the sequential acquisition of two first identifiers in the second target image is T4-T3, where T4-T3 < T2-T1. Therefore, compensation processing can be performed on the second target image, such as uniformly enlarging the horizontal axis of the second target image, or compensation processing can be performed on the first target image, such as uniformly shrinking the horizontal axis of the first target image, so that the length of the horizontal axis T4-T3 in the compensated second target image shown in Figure 9 is consistent with the length of T2-T1 in the first target image.

[0252] As shown in Figure 9(a), the target time for acquiring the target edge in the first target image is determined to be tm. Then, the target scale value corresponding to time tm in the first target image, as shown in Figure 9(b), can be used as the scale value of the target edge on the marked scale line.

[0253] In this embodiment, by performing compensation processing on the first target image and / or the second target image, the first and second identifiers acquired multiple times during the winding process of the motor assembly can be aligned along the horizontal coordinates of the first and second target images. This allows for the determination of the corresponding scale value at the same horizontal coordinate position in the second target image based on the position of the target edge along the horizontal coordinate in the first target image, even when the winding mechanism is not wound at a uniform speed and the first and second acquisition devices cannot simultaneously acquire data from the same radial direction of the winding mechanism. Thus, the scale value corresponding to the target edge in the first target image in the second target image can be accurately determined.

[0254] In some embodiments, the shape of the step signal in the first target image includes a first shape, which includes a bell shape and / or a sawtooth shape.

[0255] That is, the first shape is a curve that rises first and then falls, or a curve that does not fall first and then rise. In other words, the first shape can be a bell shape, an inverted bell shape, a zigzag shape, or an inverted zigzag shape.

[0256] In this embodiment, the shape of the step signal in the first target image includes a bell shape and / or a sawtooth shape, which facilitates the rapid extraction of information such as the edge information of the tab from the vertices of the bell shape and / or the sawtooth shape, thereby facilitating the calculation of the tab misalignment.

[0257] In some embodiments, the vertices of the first shape are used to represent the target edge to be acquired by the first data acquisition device.

[0258] For example, the shape of the step signal of the first target image may include multiple first shapes. For instance, as shown in Figure 5(a) or Figure 9(a), the shape of the step signal of the first target image includes multiple zigzag shapes, and there is a certain interval between the multiple zigzag shapes. The vertices of the zigzag shapes are used to represent the edges acquired by the tab.

[0259] In this embodiment of the application, the edge of the electrode acquired by the first data acquisition device is easily determined based on the vertex of the first shape in the first target image.

[0260] In some embodiments, the step signal of the first target image includes a signal of the first target shape, the vertex of the first target shape is used to indicate that the data acquisition device has acquired the target edge, and the first target shape is the first first shape or the last first shape in the first target image between two consecutive acquisitions of the second identifier bit at the target edge.

[0261] As shown in Figure 5(a) or Figure 9(a), in the first target image, the step signal between two consecutive acquisitions of the second identifier at the target edge includes signals with multiple sawtooth patterns. The vertex of each sawtooth pattern represents the acquisition of an edge of an electrode, such as the edge of the electrode along the circumferential direction of the winding mechanism. Generally speaking, multi-layer electrodes are usually misaligned in one direction, for example, along the winding direction of the winding mechanism. Among the edges of multiple electrodes, the edge of the outermost electrode is either the first or the last acquired electrode edge.

[0262] In this embodiment of the application, the time corresponding to the vertex of the first first shape or the vertex of the last first shape in the first target image can be used as the time when the target edge of the outermost electrode is acquired. This can determine the target edge of the outermost electrode relatively simply and accurately, thereby enabling the misalignment of the target edge of the outermost electrode to be determined quickly and accurately.

[0263] In some embodiments, the shape of the step signal in the second target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

[0264] For example, the scale lines can be evenly spaced. The image of the corresponding step signal in the second target image can be an evenly spaced sawtooth shape (as shown in Figure 5(b) or Figure 9(b)), or it can be an unequally spaced sawtooth shape. Whether the sawtooth shape is evenly spaced depends on the coordinate axis settings (e.g., whether the time interval between unit coordinates of the horizontal axis is the same), the speed of the winding mechanism, etc.

[0265] In this embodiment, the shape of the step signal in the second target image includes a bell shape and / or a sawtooth shape, which facilitates the rapid extraction of information such as the information of the lines marking the scale from the vertices of the bell shape and / or sawtooth shape, thereby facilitating the calculation of the misalignment of the tab.

[0266] In some embodiments, as shown in Figure 5(b) or Figure 9(b), the vertices of the second shape are used to indicate the lines of the identification scale that the data acquisition device has acquired.

[0267] In this embodiment of the application, the vertices of the second shape in the second target image can be used to indicate the lines of the acquired marking scale, which can simply and clearly represent the lines of the marking scale and facilitate the calculation of the misalignment of the tab.

[0268] 650. Determine the misalignment of the tab based on the difference between the corresponding mark on the marked scale line and the mark on the reference scale line at the target edge.

[0269] The scale markings include the baseline scale markings.

[0270] In this embodiment of the application, the misalignment of the tab can be accurately calculated based on the difference between the corresponding scale on the marked scale line and the scale on the reference scale line of the target edge.

[0271] In some embodiments, a reference scale line is set at the position corresponding to the marking scale line on the target edge of the electrode sheet of the perfect electrode assembly. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode sheet meets the design requirements.

[0272] In this embodiment, the scale value or scale range corresponding to the edge of the tab of the perfect electrode assembly on the marked scale line of the winding mechanism can be determined in advance. Thus, based on the difference between the scale value corresponding to the target edge on the marked scale line and the scale value or scale range of the perfect electrode assembly, the misalignment between the tab of the electrode assembly under test and the tab of the perfect electrode assembly can be accurately determined.

[0273] In some embodiments, the reference scale line can also be determined based on the scale value corresponding to the marking scale line at the target edge of the first layer tab of the motor assembly under test. For example, the position of the target edge of the first layer tab of the motor assembly under test at the marking scale line can be used as the position of the reference scale line.

[0274] In some embodiments, the spacing between adjacent lines of the marking scale is in the range of 50µm-450µm.

[0275] To improve detection accuracy, the spacing between adjacent lines of the marking scale should not be too large. On the other hand, considering the limitations of the processing accuracy of the marking scale, the spacing between adjacent lines should not be too small either. Therefore, the spacing between adjacent lines of the marking scale should range from 50μm to 450μm.

[0276] In this embodiment of the application, by setting the spacing between adjacent lines of the marking scale line in the range of 50μm-450μm, the processing accuracy requirements of the marking scale line can be met, and the detection accuracy of the tab misalignment can be improved.

[0277] In some embodiments, the spacing between adjacent lines of the marking scale is in the range of 50µm-200µm.

[0278] In this embodiment of the application, by setting the spacing between adjacent lines of the marking scale line in the range of 50μm-450μm, the detection accuracy of the tab misalignment can be further improved.

[0279] In some embodiments, the data acquisition device satisfies one or more of the following conditions:

[0280] The resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm;

[0281] The sampling frequency of the data acquisition device is greater than or equal to 10kHz;

[0282] The diameter of the light spot on the data acquisition device is smaller than the spacing between adjacent lines of the scale markings;

[0283] The detection distance of the data acquisition device is greater than or equal to 50mm.

[0284] During the detection of tab misalignment, the tabs need to be able to distinguish between adjacent layers to detect their edges. Therefore, the detection accuracy of the data acquisition device along the thickness direction of the electrode assembly (or along the radial direction of the winding mechanism) must meet the requirement of detecting the edges of adjacent layers of tabs. Thus, the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm.

[0285] During the winding process of the electrode assembly, the winding mechanism experiences uneven speeds, including acceleration and deceleration, with maximum linear speeds reaching up to 200 mm / s. Therefore, a high sampling frequency is required for the data acquisition device.

[0286] To improve detection accuracy, the detection spot of the data acquisition device should be as small as possible. Only when the diameter of the spot is smaller than the distance between adjacent lines of the scale markings can the data acquisition device distinguish between adjacent lines of the scale markings.

[0287] Because different types of electrode assemblies have different numbers of turns and tabs, the detection distance of the data acquisition device needs to be compatible with electrode assemblies of different thicknesses.

[0288] In this embodiment, by controlling the detection accuracy of the data acquisition device along the thickness direction of the electrode assembly, the sampling frequency of the data acquisition device, and the diameter of the light spot of the data acquisition device to be smaller than the spacing between adjacent lines of the marking scale line within a reasonable range, the detection accuracy can be improved; by controlling the detection distance of the data acquisition device within a reasonable range, it is possible to be compatible with the detection of electrode tab misalignment of electrode assemblies of different models and sizes, thereby improving the applicability of the data acquisition device.

[0289] In some embodiments, the data acquisition device satisfies one or more of the following conditions:

[0290] The resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm;

[0291] The sampling frequency of the data acquisition device is greater than or equal to 20kHz;

[0292] The diameter of the light spot in the data acquisition device is less than or equal to 40 μm;

[0293] The detection distance of the data acquisition device ranges from 50mm to 100mm.

[0294] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0295] The battery system detection method of the present application embodiment has been described in detail above. The battery system detection device of the present application embodiment will be described in detail below with reference to FIG10 and FIG11. The technical features described in the method embodiment are applicable to the following device embodiment.

[0296] Figure 10 is a schematic block diagram of a detection device for a battery system provided in an embodiment of this application. As shown in Figure 10, the detection device 4000 is used to detect the tabs of the electrode assembly during the stacking of electrode assemblies on a stacking mechanism. The detection device 4000 includes an acquisition unit 4010 and a processing unit 4020.

[0297] The acquisition unit 4010 is used to acquire first data and second data during the process of stacking the electrode assembly on the stacking mechanism, using a data acquisition device to generate a target image. The first data includes data of the target edge of the electrode tab, and the second data includes data of the marked scale lines on the stacking mechanism. The electrode assembly includes the electrode tab, and the target edge includes the edge of the stacked surface of the electrode tab. The processing unit 4020 is used to determine the scale value corresponding to the target edge on the marked scale line based on the target image, and to determine the misalignment amount of the electrode tab based on the scale value corresponding to the target edge on the marked scale line.

[0298] In some embodiments, the stacking mechanism includes a winding mechanism and the electrode assembly includes a wound electrode assembly.

[0299] In some embodiments, the marking scale lines are arranged along a first direction, which is the circumferential direction of the winding mechanism.

[0300] In some embodiments, the marking scale lines are disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0301] In some embodiments, the marking scale line is disposed on the winding surface of the first end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism, and the first end being the end away from the tab.

[0302] In some embodiments, the marking lines include equally spaced marking lines.

[0303] In some embodiments, the target edge includes the edge of at least one end of the stacked surface of the target tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target tab being the outermost tab of the electrode assembly during the winding process.

[0304] In some embodiments, the acquisition unit 4010 is used to acquire first data acquired by a first data acquisition device and second data acquired by a second data acquisition device, wherein the data acquisition device includes a first data acquisition device and a second data acquisition device.

[0305] In some embodiments, the first data acquisition device and the second data acquisition device may simultaneously acquire data along the same radial direction of the winding mechanism.

[0306] In some embodiments, the first data acquisition device and the second data acquisition device are disposed in a third direction, where the third direction is any radial direction of the winding mechanism.

[0307] In some embodiments, the first data acquisition device and the second data acquisition device are at the same distance from the winding mechanism.

[0308] In some embodiments, the data acquisition device is positioned toward the winding surface of the winding mechanism.

[0309] In some embodiments, the data acquisition device includes a linear array data acquisition device.

[0310] In some embodiments, the processing unit 4020 generates a first target image based on first data and generates a second target image based on second data, wherein the target image includes a first target image and a second target image, the first target image includes a step signal image with the horizontal axis representing the acquisition time and the vertical axis representing whether the target edge was acquired, and the second target image includes a step signal image with the horizontal axis representing the acquisition time and the vertical axis representing whether the marking scale line was acquired.

[0311] In some embodiments, the second data further includes data of the first identifier bit, and the second target image includes an image of the first identifier bit. The first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

[0312] In some embodiments, the first identifier is disposed on the first target radial direction, which is the radial direction other than the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0313] In some embodiments, a first identifier is disposed on a first target radial direction and a second target radial direction. The first target radial direction is a radial direction other than the radial direction in which the first projection area and the second projection area on the winding mechanism are located. The second target radial direction is a radial direction other than the radial direction in which the first projection area and the second projection area on the winding mechanism are located. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are respectively the projection areas of the multilayer first polarity tabs and the multilayer second polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes an electrode assembly.

[0314] In some embodiments, the end of the first identifier position along a first direction is disposed on the line of the identifier scale line, and the first direction is the circumferential direction of the winding mechanism.

[0315] In some embodiments, a first identifier is disposed at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism, the opening being for winding the electrode assembly, and the winding surface of the winding mechanism including one or two openings along the first direction.

[0316] In some embodiments, the first data further includes data of a second identifier bit, and the first target image includes an image of the second identifier bit. The second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism. The first identifier bit and the second identifier bit are located on the same radial direction of the winding mechanism.

[0317] In some embodiments, the processing unit 4020 is configured to: determine the target time for acquiring the target edge in the first target image; and use the target scale value corresponding to the target time in the second target image as the scale value corresponding to the target edge on the marked scale line.

[0318] In some embodiments, the processing unit 4020 is configured to: perform compensation processing on the first target image and / or the second target image so that a plurality of second identifier bits in the first target image are respectively aligned with a plurality of first identifier bits in the second target image along the horizontal coordinate.

[0319] In some embodiments, the shape of the step signal in the first target image includes a first shape, which includes one or more of a bell shape and / or a sawtooth shape.

[0320] In some embodiments, the vertices of the first shape are used to indicate the edge of the target being acquired.

[0321] In some embodiments, the step signal of the first target image includes a signal of the first target shape, the vertex of the first target shape being used to indicate that the data acquisition device has acquired the target edge, and the first target shape being the first first shape or the last first shape in the first target image between two consecutive acquisitions of the target edge at the second identifier.

[0322] In some embodiments, the shape of the step signal in the second target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

[0323] In some embodiments, the vertices of the second shape are used to indicate the lines that the data acquisition device has acquired to identify the scale lines.

[0324] In some embodiments, the processing unit 4020 is configured to determine the misalignment amount of the tab based on the difference between the corresponding scale on the marked scale line and the scale corresponding to the reference scale line of the target edge, wherein the marked scale line includes the reference scale line.

[0325] In some embodiments, a reference scale line is set at the position of the electrode edge of the perfect electrode assembly corresponding to the marking scale line. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode meets the design requirements.

[0326] In some embodiments, the spacing between adjacent lines of the marking scale is in the range of 50µm-450µm.

[0327] In some embodiments, the spacing between adjacent lines of the marking scale is in the range of 50µm-200µm.

[0328] In some embodiments, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm; the sampling frequency of the data acquisition device is greater than or equal to 10 kHz; the diameter of the light spot of the data acquisition device is less than the spacing between adjacent lines of the marking scale; and the detection distance of the data acquisition device is greater than or equal to 50 mm.

[0329] In some embodiments, the data acquisition device satisfies one or more of the following conditions: the resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm; the sampling frequency of the data acquisition device is greater than or equal to 20 kHz; the diameter of the light spot of the data acquisition device is less than or equal to 40 μm; and the detection distance of the data acquisition device is in the range of 50 mm to 100 mm.

[0330] It should be understood that the above and other operations and / or functions of the various modules in the electrode misalignment detection device 4000 are for the purpose of implementing the corresponding processes in the various methods of Figures 1 to 9, and for the sake of brevity, they will not be described in detail here.

[0331] Figure 11 shows a schematic block diagram of a tab misalignment detection device 5000 according to an embodiment of this application. As shown in Figure 11, the detection device 5000 includes a processor 5010 and a memory 5020, wherein the memory 5020 is used to store instructions, and the processor 5010 is used to read the instructions and execute the detection methods of the various embodiments of this application described above based on the instructions.

[0332] The memory 5020 can be a separate device independent of the processor 5010, or it can be integrated into the processor 5010.

[0333] Optionally, as shown in Figure 11, the electrode misalignment detection device 5000 may further include a transceiver 5030, and the processor 5010 may control the transceiver 5030 to communicate with other devices. Specifically, it may send information or data to other devices, or receive information or data sent by other devices.

[0334] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the detection method disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0335] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0336] This application also provides a computer-readable storage medium for storing computer programs.

[0337] Optionally, the computer-readable storage medium can be applied to the electrode misalignment detection device in the embodiments of this application, and when the computer program is run on the computer, it causes the computer to execute the corresponding processes implemented by the electrode misalignment detection device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0338] This application also provides a computer program product, including computer program instructions.

[0339] Optionally, the computer program product can be applied to the electrode misalignment detection device in the embodiments of this application, and when the computer program instructions are run on the computer, the computer executes the corresponding process implemented by the electrode misalignment detection device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0340] This application also provides a computer program.

[0341] Optionally, the computer program can be applied to the electrode misalignment detection device in the embodiments of this application. When the computer program is run on a computer, the computer executes the corresponding processes implemented by the electrode misalignment detection device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0342] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0343] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0344] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the detection apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of this application may be through some interfaces, indirect coupling or communication connection of devices or units, and may be electrical, mechanical, or other forms.

[0345] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0346] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0347] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0348] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This 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 method for detecting the amount of electrode misalignment, characterized in that, The detection method is used to detect the tabs of the electrode assembly during the stacking of electrode assemblies on a stacking mechanism, and the detection method includes: Acquire first data and second data collected by the data acquisition device. The first data includes data on the target edge of the electrode tab, and the second data includes data on the marking scale lines on the stacking mechanism. The target edge includes the edge of the stacking surface of the electrode tab. Based on the first data and the second data, a target image is generated, the target image including whether the relationship between the target edge and the acquisition time is captured and whether the relationship between the marker scale line and the acquisition time is captured; Based on the target image, determine the scale value of the target edge corresponding to the marked scale line; The misalignment of the tab is determined based on the scale value corresponding to the target edge on the marked scale line.

2. The detection method according to claim 1, characterized in that, The stacking mechanism includes a winding mechanism and the electrode assembly includes a wound electrode assembly.

3. The detection method according to claim 2, characterized in that, The marking scale lines are arranged along a first direction, which is the circumferential direction of the winding mechanism.

4. The detection method according to claim 2 or 3, characterized in that, The marking scale line is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

5. The detection method according to any one of claims 2 to 4, characterized in that, The marking scale line is disposed on the winding surface of the first end of the winding mechanism along the second direction, the second direction being the axial direction of the winding mechanism, and the first end being the end away from the tab.

6. The detection method according to any one of claims 1 to 5, characterized in that, The marking scale lines include equally spaced scale lines.

7. The detection method according to any one of claims 2 to 6, characterized in that, The target edge includes the edge of at least one end of the stacked surface of the target electrode tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target electrode tab being the outermost electrode tab of the electrode assembly during the winding process.

8. The detection method according to any one of claims 2 to 7, characterized in that, The acquisition of the first and second data collected by the data acquisition device includes: The system acquires the first data collected by the first data acquisition device and the second data collected by the second data acquisition device, wherein the data acquisition device includes the first data acquisition device and the second data acquisition device.

9. The detection method according to claim 8, characterized in that, The first data acquisition device and the second data acquisition device can simultaneously acquire data along the same radial direction of the winding mechanism.

10. The detection method according to claim 8 or 9, characterized in that, The first data acquisition device and the second data acquisition device are disposed in a third direction, wherein the third direction is any radial direction of the winding mechanism.

11. The detection method according to any one of claims 8 to 10, characterized in that, The first data acquisition device and the second data acquisition device are at the same distance from the winding mechanism.

12. The detection method according to any one of claims 2 to 11, characterized in that, The data acquisition device is positioned facing the winding surface of the winding mechanism.

13. The detection method according to any one of claims 1 to 12, characterized in that, The data acquisition device includes a linear array data acquisition device.

14. The detection method according to any one of claims 2 to 13, characterized in that, The step of generating a target image based on the first data and the second data includes: Based on the first data, a first target image is generated, and... Based on the second data, a second target image is generated. The target image includes a first target image and a second target image. The first target image includes a step signal image with time as the horizontal axis and whether the edge of the target was captured as the vertical axis. The second target image includes a step signal image with time as the horizontal axis and whether the line of the marker scale was captured as the vertical axis.

15. The detection method according to claim 14, characterized in that, The second data also includes data of the first identifier bit, and the second target image also includes an image of the first identifier bit, wherein the first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

16. The detection method according to claim 15, characterized in that, The first identifier is located on the first target radial direction, which is the radial direction other than the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes the electrode assembly.

17. The detection method according to claim 15, characterized in that, The first identification position is set on the first target radial direction and the second target radial direction. The first target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The second target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are the projection areas of the multilayer first polarity tab and the multilayer second polarity tab of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes the electrode assembly.

18. The detection method according to any one of claims 15 to 17, characterized in that, The first mark is located at its end along a first direction on the line of the mark scale, where the first direction is the circumferential direction of the winding mechanism.

19. The detection method according to any one of claims 15 to 17, characterized in that, The first identifier is located at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism. The opening is used for the electrode assembly to be wound in, and the winding surface of the winding mechanism includes one or two openings along the first direction.

20. The detection method according to any one of claims 14 to 19, characterized in that, The first data also includes data of the second identifier bit, and the second target image includes the image of the second identifier bit. The second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism. The first identifier bit and the second identifier bit are located on the same radial direction of the winding mechanism.

21. The detection method according to any one of claims 14 to 20, characterized in that, Determining the scale value of the target edge corresponding to the marked scale line based on the target image includes: Determine the target time for acquiring the target edge in the first target image; The target scale value in the second target image corresponding to the target time is used as the scale value of the target edge on the marked scale line.

22. The detection method according to any one of claims 14 to 21, characterized in that, Before determining the scale value corresponding to the target edge on the marked scale line based on the target image, the detection method further includes: The first target image and / or the second target image are compensated to align the plurality of second identifier bits in the first target image and the plurality of first identifier bits in the second target image along the horizontal axis.

23. The detection method according to any one of claims 14 to 21, characterized in that, The shape of the step signal in the first target image includes a first shape, which includes one or more of bell and / or sawtooth shapes.

24. The detection method according to claim 23, characterized in that, The vertices of the first shape are used to indicate the edge of the target being acquired.

25. The detection method according to claim 23 or 24, characterized in that, The step signal of the first target image includes a signal of the first target shape. The vertex of the first target shape is used to indicate the target edge of the target electrode acquired by the data acquisition device. The first target shape is the first first shape or the last first shape acquired in the first target image between the second identifier position before and after the acquisition of the target edge of the target electrode. The target electrode is the outermost electrode of the electrode assembly during the winding process.

26. The detection method according to any one of claims 14 to 25, characterized in that, The shape of the step signal in the first target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

27. The detection method according to claim 26, characterized in that, The vertices of the second shape are used to indicate the lines of the marking scale that the data acquisition device has acquired.

28. The detection method according to any one of claims 2 to 27, characterized in that, Determining the misalignment of the electrode tab based on the scale value corresponding to the target edge on the marked scale line includes: The misalignment of the electrode tab is determined based on the difference between the corresponding scale mark on the marked scale line and the scale mark on the reference scale line of the target edge. The marked scale line includes the reference scale line.

29. The detection method according to claim 28, characterized in that, The reference scale line is set at the position of the electrode edge of the perfect electrode assembly corresponding to the marked scale line. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode meets the design requirements.

30. The detection method according to any one of claims 1 to 29, characterized in that, The spacing between adjacent lines of the marking scale is in the range of 50μm-450μm.

31. The detection method according to any one of claims 1 to 30, characterized in that, The spacing between adjacent lines of the marking scale is in the range of 50μm-200μm.

32. The detection method according to any one of claims 2 to 31, characterized in that, The data acquisition device meets one or more of the following conditions: The resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 100 μm; The sampling frequency of the data acquisition device is greater than or equal to 10kHz; The diameter of the light spot of the data acquisition device is smaller than the spacing between adjacent lines of the marking scale; The detection distance of the data acquisition device is greater than or equal to 50mm.

33. The detection method according to any one of claims 2 to 32, characterized in that, The data acquisition device meets one or more of the following conditions: The resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm; The sampling frequency of the data acquisition device is greater than or equal to 20kHz; The diameter of the light spot of the data acquisition device is less than or equal to 40 μm; The detection distance of the data acquisition device ranges from 50mm to 100mm.

34. A device for detecting the amount of electrode misalignment, characterized in that, The detection device is used to detect the tabs of the electrode assembly during the stacking of the electrode assembly on the stacking mechanism, and the detection device includes: The acquisition unit is used to acquire first data and second data collected by the data acquisition device. The first data includes data of the target edge of the electrode tab, and the second data includes data of the marking scale lines on the stacking mechanism. The target edge includes the edge of the stacking surface of the electrode tab. The processing unit is configured to generate a target image based on the first data and the second data, the target image including whether the relationship between the target edge and the acquisition time is captured and whether the relationship between the marker scale line and the acquisition time is captured; Based on the target image, determine the scale value corresponding to the target edge on the marked scale line; and The misalignment of the tab is determined based on the scale value corresponding to the target edge on the marked scale line.

35. The detection device according to claim 34, characterized in that, The stacking mechanism includes the winding mechanism and the electrode assembly includes the wound electrode assembly.

36. The detection device according to claim 35, characterized in that, The marking scale lines are arranged along a first direction, which is the circumferential direction of the winding mechanism.

37. The detection device according to claim 35 or 36, characterized in that, The marking scale line is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

38. The detection device according to any one of claims 35 to 37, characterized in that, The marking scale line is disposed on the winding surface of the first end of the winding mechanism along the second direction, the second direction being the axial direction of the winding mechanism, and the first end being the end away from the tab.

39. The detection device according to any one of claims 34 to 38, characterized in that, The marking scale lines include equally spaced scale lines.

40. The detection device according to any one of claims 34 to 39, characterized in that, The target edge includes the edge of at least one end of the stacked surface of the target electrode tab in a first direction, the first direction being the circumferential direction of the winding mechanism, and the target electrode tab being the outermost electrode tab of the electrode assembly during the winding process.

41. The detection device according to any one of claims 34 to 40, characterized in that, The acquisition unit is used to acquire the first data acquired by the first data acquisition device and the second data acquired by the second data acquisition device, wherein the data acquisition device includes the first data acquisition device and the second data acquisition device.

42. The detection device according to claim 41, characterized in that, The first data acquisition device and the second data acquisition device can simultaneously acquire data along the same radial direction of the winding mechanism.

43. The detection device according to claim 41 or 42, characterized in that, The first data acquisition device and the second data acquisition device are disposed in a third direction, wherein the third direction is any radial direction of the winding mechanism.

44. The detection device according to any one of claims 41 to 43, characterized in that, The first data acquisition device and the second data acquisition device are at the same distance from the winding mechanism.

45. The detection apparatus according to any one of claims 35 to 44, characterized in that, The data acquisition device is positioned facing the winding surface of the winding mechanism.

46. ​​The detection device according to any one of claims 34 to 45, characterized in that, The data acquisition device includes a linear array data acquisition device.

47. The detection device according to any one of claims 35 to 46, characterized in that, The processing unit is configured to generate a first target image based on the first data, and Based on the second data, a second target image is generated. The target image includes a first target image and a second target image. The first target image includes a step signal image with the acquisition time on the horizontal axis and whether the target edge was acquired on the vertical axis. The second target image includes a step signal image with the acquisition time on the horizontal axis and whether the line of the marker scale was acquired on the vertical axis.

48. The detection device according to any one of claims 35 to 47, characterized in that, The second data also includes data of the first identifier bit, and the second target image also includes an image of the first identifier bit, wherein the first identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism.

49. The detection device according to claim 48, characterized in that, The first identifier is located on the first target radial direction, which is the radial direction other than the first projection area on the winding mechanism. The first projection area is the projection area of ​​the multilayer first polarity tabs of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes the electrode assembly.

50. The detection device according to claim 48, characterized in that, The first identification position is set on the first target radial direction and the second target radial direction. The first target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The second target radial direction is the radial direction other than the first projection area and the second projection area on the winding mechanism. The first target radial direction and the second target radial direction are respectively located on both sides of the first projection area or the second projection area along the first direction. The first projection area and the second projection area are respectively the projection areas of the multilayer first polarity tab and the multilayer second polarity tab of the electrode assembly under test on the winding mechanism. The electrode assembly under test includes the electrode assembly.

51. The detection apparatus according to any one of claims 48 to 50, characterized in that, The first mark is located at its end along a first direction on the line of the mark scale, where the first direction is the circumferential direction of the winding mechanism.

52. The detection apparatus according to any one of claims 48 to 50, characterized in that, The first identifier is located at the edge of the opening of the winding surface of the winding mechanism along a first direction, the first direction being the circumferential direction of the winding mechanism. The opening is used for the electrode assembly to be wound in, and the winding surface of the winding mechanism includes one or two openings along the first direction.

53. The detection device according to any one of claims 47 to 52, characterized in that, The first data also includes data of the second identifier bit, and the second target image includes the image of the second identifier bit. The second identifier bit is disposed on the winding surface of at least one end of the winding mechanism along a second direction, the second direction being the axial direction of the winding mechanism. The first identifier bit and the second identifier bit are located on the same radial direction of the winding mechanism.

54. The detection device according to any one of claims 47 to 53, characterized in that, The processing unit is used for: Determine the target time for acquiring the target edge in the first target image; The target scale value in the second target image corresponding to the target time is used as the scale value of the target edge on the marked scale line.

55. The detection apparatus according to any one of claims 47 to 54, characterized in that, The processing unit is configured to perform compensation processing on the first target image and / or the second target image, so that a plurality of second identifier bits in the first target image are aligned with a plurality of first identifier bits in the second target image along the horizontal coordinate.

56. The detection apparatus according to any one of claims 47 to 55, characterized in that, The shape of the step signal in the first target image includes a first shape, which includes one or more of bell and / or sawtooth shapes.

57. The detection device according to claim 56, characterized in that, The vertices of the first shape are used to indicate the edge of the target being acquired.

58. The detection device according to claim 56 or 57, characterized in that, The step signal of the first target image includes a signal of the first target shape. The vertex of the first target shape is used to indicate that the data acquisition device has acquired the target edge. The first target shape is either the first first shape or the last first shape in the first target image between two consecutive acquisitions of the second identifier bit when the target edge is acquired.

59. The detection apparatus according to any one of claims 47 to 58, characterized in that, The shape of the step signal in the second target image includes a second shape, and the first shape includes a bell shape and / or a sawtooth shape.

60. The detection device according to claim 59, characterized in that, The vertices of the second shape are used to indicate the lines of the marking scale that the data acquisition device has acquired.

61. The detection device according to any one of claims 35 to 60, characterized in that, The processing unit is used to determine the misalignment of the tab based on the difference between the corresponding scale mark on the marked scale line and the scale mark corresponding to the reference scale line of the target edge. The marked scale line includes the reference scale line.

62. The detection device according to claim 61, characterized in that, The reference scale line is set at the position of the electrode edge of the perfect electrode assembly corresponding to the marked scale line. The perfect electrode assembly includes an electrode assembly whose target edge of the electrode meets the design requirements.

63. The detection device according to any one of claims 34 to 62, characterized in that, The spacing between adjacent lines of the marking scale is in the range of 50μm-450μm.

64. The detection device according to any one of claims 34 to 63, characterized in that, The spacing between adjacent lines of the marking scale is in the range of 50μm-200μm.

65. The detection apparatus according to any one of claims 35 to 64, characterized in that, The data acquisition device meets one or more of the following conditions: The resolution of the data acquisition device along the thickness direction of the electrode assembly is equal to or greater than 100 μm. The sampling frequency of the data acquisition device is greater than or equal to 10kHz; The diameter of the light spot of the data acquisition device is smaller than the spacing between adjacent lines of the marking scale; The detection distance of the data acquisition device is greater than or equal to 50mm.

66. The detection apparatus according to any one of claims 35 to 65, characterized in that, The data acquisition device meets one or more of the following conditions: The resolution of the data acquisition device along the thickness direction of the electrode assembly is less than or equal to 7 μm; The sampling frequency of the data acquisition device is greater than or equal to 20kHz; The diameter of the light spot of the data acquisition device is less than or equal to 40 μm; The detection distance of the data acquisition device ranges from 50mm to 100mm.

67. A device for detecting the amount of electrode misalignment, characterized in that, The control device includes a memory and a processor, the memory being used to store instructions, and the processor being used to read the instructions and execute the detection method as described in any one of claims 1 to 33 according to the instructions.

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