Method, apparatus and storage medium for detecting areal density of battery electrode sheet

Abstract

The application provides a method and device for detecting the surface density of battery pole piece coating and a storage medium. In the embodiment, a trajectory generated by a measuring instrument when performing line scanning on the coating on the battery pole piece is obtained. Target points located outside the trajectory are determined in the coating. A plurality of reference points are set for the target points on the trajectory. The reference points have actual surface densities detected by the measuring instrument. The actual surface densities of the reference points are corrected to reference surface densities according to the positional relationship between the target points and the reference points. The reference surface densities of the reference points are fused to target surface densities of the target points according to the positional relationship between the target points and the reference points. The surface density data of the entire pole piece is effectively completed, and the quality control of the battery cell manufacturing process is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of batteries, and in particular relates to a method, equipment and storage medium for detecting the areal density of battery electrode coatings. Background Technology

[0002] In the field of lithium and sodium-ion batteries, the positive and negative electrodes of the battery are usually encapsulated inside the cell in the form of sheet-like electrodes. The electrodes are based on a metal current collector and their surfaces are coated with electrode active materials. The uniformity of the coating can be quantitatively characterized by the coating surface density at each point on the electrode.

[0003] Due to the influence of multiple process factors such as fluctuations in slurry rheological properties, deviations in coating equipment precision, and unstable belt tension, the areal density of electrode coating is prone to local unevenness. If there is a deviation in the areal density of corresponding areas of the positive and negative electrode sheets, it will cause a local imbalance in the NP ratio (Negative / Positive Ratio, the ratio of negative to positive electrode capacity), which will lead to a series of quality abnormalities such as large fluctuations in cell capacity, high single-cell voltage difference, precipitation of active materials, and black spots on the electrode surface. This will not only directly degrade the electrochemical performance and cycle life of the battery, but may also cause safety hazards such as internal short circuits and thermal runaway in severe cases.

[0004] Currently, the mainstream testing method for electrode coating surface density in the industry is line scanning detection, such as... Figure 1 As shown, the detection trajectory is linearly distributed along the electrode's running direction. However, relevant data indicates that the effective detection coverage of this scanning method is only about 5% of the entire electrode area, meaning that most areas of the electrode surface are not effectively detected. This results in a large amount of missing areal density data across the entire electrode area, leading to low accuracy in determining the NP ratio matching status at corresponding positions on the electrode. Ultimately, this significantly reduces the ability to detect and prevent areal density anomalies, impacting quality control during cell manufacturing. Summary of the Invention

[0005] In view of this, the present invention provides a method, apparatus and storage medium for detecting the areal density of battery electrode coatings, so as to improve the coverage of the areal density detection of battery electrode coatings.

[0006] A first aspect of the present invention provides a method for detecting the areal density of a battery electrode coating, comprising: Acquire the trajectory generated when the measuring instrument performs a line scan on the coating on the battery electrode; Determine target points located outside the trajectory during the coating process; Multiple reference points are set for the target point on the trajectory; the reference points have the actual surface density detected by the measuring instrument. Based on the positional relationship between the target point and the reference point, the actual surface density of the reference point is corrected to the reference surface density; The reference surface density of the reference point is fused into the target surface density of the target point based on the positional relationship between the target point and the reference point.

[0007] A second aspect of the present invention provides an apparatus for detecting the areal density of battery electrode coatings, comprising: The line scan trajectory acquisition module is used to acquire the trajectory generated when the measuring instrument performs line scan on the coating on the battery electrode sheet; A target point determination module is used to determine target points located outside the trajectory in the coating process; A reference point setting module is used to set multiple reference points for the target point on the trajectory; the reference points have the actual surface density detected by the measuring instrument. The reference point correction module is used to correct the actual surface density of the reference point to the reference surface density based on the positional relationship between the target point and the reference point. The target surface density fusion module is used to fuse the reference surface density of the reference point into the target surface density of the target point based on the positional relationship between the target point and the reference point.

[0008] A third aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method for detecting the areal density of battery electrode coating as described in the first aspect above.

[0009] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for detecting the areal density of battery electrode coating as described in the first aspect above.

[0010] A fifth aspect of the present invention provides a computer program product that, when run on a computer, causes the computer to perform the method for detecting the areal density of battery electrode coating as described in the first aspect above.

[0011] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In this embodiment, the trajectory generated by the measuring instrument during line scanning of the coating on the battery electrode is acquired; a target point located outside the trajectory is determined in the coating; multiple reference points are set for the target point on the trajectory; the reference points have the actual areal density detected by the measuring instrument; the actual areal density of the reference points is corrected to the reference areal density based on the positional relationship between the target point and the reference points; the reference areal densities of the reference points are fused to the target areal density of the target point based on the positional relationship between the target point and the reference points. This embodiment fits the target areal density based on the actual areal density of the reference points on the line scanning trajectory surrounding the target point. Because the current collector coating is continuous and smooth, the areal density is theoretically continuous and does not have large jumps. The reference points in multiple directions provide rich areal density distribution information, which can improve the accuracy of fitting the target areal density of the target point, effectively complete the areal density data of the entire electrode area, improve the accuracy of determining the NP ratio matching state of each corresponding position of the electrode, thereby improving the detection and prevention capabilities of areal density anomalies and improving the quality control of the cell manufacturing process.

[0012] Furthermore, the fitting process relies on program execution and does not require investment in new equipment or modification of existing equipment, making it low-cost and easy to promote. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a line scan trajectory; Figure 2 This is a schematic diagram of a method for detecting the areal density of battery electrode coating provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a target point selection method provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of setting a reference point according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a normal belt conveyor speed linear sweep trajectory provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of a long-deceleration line sweep trajectory provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of a coating die, electrode surface density distribution, and die lip spacing provided in an embodiment of the present invention; Figure 8This is a schematic diagram of a device for detecting the surface density of battery electrode coating provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0015] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will recognize that the present application may be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted to avoid unnecessary detail that could obscure the description of the present application.

[0016] The technical solution of the present invention will be illustrated below through specific embodiments.

[0017] Reference Figure 2 The diagram illustrates a method for detecting the areal density of battery electrode coatings according to an embodiment of the present invention, which may specifically include the following steps: Step 201: Obtain the trajectory generated when the measuring instrument performs a line scan on the coating on the battery electrode.

[0018] In this embodiment, when a measuring instrument performs a line scan on the coating on the battery electrode, a line scan trajectory is generated. There are multiple points on the line scan trajectory, and each point has the areal density detected by the measuring instrument.

[0019] In practical applications, there are various methods for linear scanning of the surface density of coatings on battery electrodes. For example, β-ray (Kr85), X-ray, and air-coupled ultrasonic waves all use a gantry to mount probes and scan laterally along the width of the electrode. The β-ray method can be used for both positive and negative electrodes, the X-ray method is mainly used for positive electrodes, and the air-coupled ultrasonic wave method can detect dry and wet film electrodes. The linear array detector full-range line scanning uses a fixed probe array and completes full-width detection with the help of the electrode conveyor belt, which is suitable for all types of electrodes.

[0020] Step 202: Determine the target point located outside the trajectory in the coating process.

[0021] In practical applications, the surface of the coated electrode is a sheet-like structure with a thickness ranging from tens to hundreds of micrometers. The trajectory of the line scan is a broken line, which can determine the points located outside the trajectory during the coating of the electrode as target points. That is, the target points are not measured by the instrument to generate areal density.

[0022] For example, such as Figure 2As shown, assuming that the area of ​​a target point (i.e., the calculation point) can be the actual surface density information within a certain range of the measured trajectory centered on the target point (i.e., the calculation point), and requiring that any point of the electrode can fall within at least one circle with the minimum number of points taken, then methods such as the regular hexagonal honeycomb method can be used to determine the target point (i.e., the calculation point) located outside the trajectory during coating. In this way, the target points are uniform and the number is minimized.

[0023] Of course, in addition to the above-mentioned hexagonal honeycomb method, other methods can be used to determine the target point outside the trajectory during coating according to actual needs. For example, target points outside the trajectory can be randomly determined during coating, multiple points can be set at equal intervals on the coating surface, points inside the trajectory can be excluded, and so on. This embodiment does not limit this.

[0024] Step 203: Set multiple reference points for the target point on the trajectory.

[0025] In this embodiment, since the current collector coating is continuous and smooth, the density is theoretically continuous and there are no large jumps. Therefore, multiple points at appropriate distances can be set on the target point along the online scanning trajectory as reference points. That is, the actual surface density of the reference points is used as a reference for fitting the area of ​​the target point.

[0026] Generally, one or more segments of trajectory closest to the target point can be determined, and multiple reference points can be set for the target point within these segments. This ensures optimal continuity of the surface density and improves the accuracy of fitting the surface density of the target point.

[0027] In one method of point selection, such as Figure 4 As shown, for any target point A on the coating, a first straight line perpendicular to the direction of the electrode strip can be drawn through target point A, and the intersection of the first straight line and the trajectory (i.e., point ①) can be determined as the reference point.

[0028] On the two broken lines of the trajectory closest to the target point A, determine the two points (i.e., points ② and ③) closest to target point A as reference points. At this time, reference points ② and ③ are the target points. Draw a second straight line parallel to the direction of the electrode strip through the target point A. Determine the two points (points ④ and ⑤) where the second straight line intersects the two broken lines on the trajectory closest to the target point A as reference points.

[0029] In this selection method, reference points in multiple directions are selected for the target point. These reference points provide rich information on the surface density distribution, which is more conducive to improving the accuracy of the surface density of the fitted target point.

[0030] Step 204: Correct the actual surface density of the reference point to the reference surface density based on the positional relationship between the target point and the reference point.

[0031] Each reference point has the actual surface density measured by the measuring instrument, and the actual surface density measured by the measuring instrument at the reference point can be recorded as the actual surface density.

[0032] When selecting reference points, the positional relationship between the target point and multiple reference points macroscopically represents the positional distribution between the target point and multiple reference points. Based on this, the distribution law of the coating surface density of the positive and negative electrode sheets of the battery can be followed, and the actual surface density of each reference point can be corrected to the reference surface density relative to the target point using linear or nonlinear methods.

[0033] In one embodiment of the present invention, step 204 may include the following steps: Step 2041: Configure a correction coefficient for the reference point relative to the target point based on the positional relationship between the target point and the reference point.

[0034] For each reference point, the possible transformation relationship between the areal density of the target point and the areal density of the reference point can be identified based on the positional relationship between the target point and the reference point, thereby configuring the correction coefficient of the reference point relative to the target point.

[0035] In one case, if the target point (e.g.) Figure 4 Target point A) and reference point (e.g. Figure 4 The line connecting the reference points ① is perpendicular to the electrode travel direction. Considering the structure of the coating process equipment (such as extrusion coating), this reference point (such as...) Figure 4 Reference point ①) and target point (e.g. Figure 4 Target point A) is coated simultaneously. If the distance between the lips of the coating die head is completely consistent, then the reference point (such as...) Figure 4 The surface density of the reference point ①) and the target point (e.g. Figure 4 The surface density of target point A is consistent with the theory. However, since the actual process spacing cannot be completely consistent, the die head spacing method can be used to confirm the reference point (e.g., ...). Figure 4 How is the areal density of the reference point ① mapped to the target point (e.g.) Figure 4 The surface density of target point A).

[0036] In this method, a reduced-speed surface density line scan can be performed on each coating process machine, thereby obtaining more surface density under shorter electrode lengths and a more stable process, thus establishing a distribution map of electrode surface density, compared to... Figure 5 The linear scan trajectory of the surface density at normal belt speed shown is illustrated under electrode deceleration conditions. Figure 6 The linear scan trajectory of the surface density shown can be approximated as a scan perpendicular to the band direction, rather than an oblique line.

[0037] like Figure 7As shown, the die lip is a narrow slit, which can be simplified to a straight line segment. Based on the surface density distribution diagram, the lip spacing of the coating die can be confirmed. The lip spacing is mainly caused by systematic errors (errors on the same side, such as assembly errors) or wear during use. The deviation value of the surface density given at different positions of the die (i.e., the die gap deviation) is calculated by taking the leftmost part of the die as the zero point coordinate. The ratio between the average surface density measured at the same coordinate and the designed surface density (i.e., the standard surface density) is the surface density deviation value at that point.

[0038] So, determine the target point (e.g.) Figure 4 The position of target point A within the mold head is denoted as the first position, and a reference point is determined (e.g., ...). Figure 4 The reference point ①) is located in the mold head, and is denoted as the second position.

[0039] Query the deviation value corresponding to the first position and record it as the first surface density deviation value. Then, the first surface density deviation value represents the ratio between the average surface density at the first position and the standard surface density.

[0040] The deviation value corresponding to the second position is queried and recorded as the second surface density deviation value. Then, the second surface density deviation value represents the ratio between the average surface density at the second position and the standard surface density.

[0041] Calculate the ratio between the first surface density deviation value and the second surface density deviation value, and use it as a reference point to configure a correction coefficient relative to the target point.

[0042] For example, if the position of the die head is 0, the deviation value is 99.127%; if the position of the die head is 1, the deviation value is 99.154%; if the position of the die head is 2, the deviation value is 99.773%... if the position of the die head is 47, the deviation value is 100.001%... if the position of the die head is 82, the deviation value is 100.556%.

[0043] Let the target point A be at position 47 on the die head, and the reference point ① be at position 2 on the die head. Let the first surface density deviation value of the target point A be D. A The second surface density deviation value of reference point ① is D. ① Then, the reference point ① is configured with a correction coefficient a relative to the target point A. ① =D A / D ① =100.001% / 99.154%.

[0044] In another case, if two reference points (such as...) Figure 4 Reference points ② and ③ are two broken lines on the trajectory that intersect the target point (e.g., ...). Figure 4The target point A) is the two closest points. Considering that the current collector coating is continuous and smooth, the density is theoretically continuous and there is no large jump. Therefore, the distance between the two reference points and the target point is added to obtain the first total length.

[0045] For any one of the two reference points, calculate the ratio between the first length deviation and the first total length, and use it as the correction coefficient of any reference point relative to the target point; wherein, the first length deviation is the difference between 1 and the distance between any reference point and the target point.

[0046] Let L be the distance between target point A and reference point ②. A② The distance between target point A and reference point ③ is L. A③ Then, the reference point ② is configured with a correction factor a relative to the target point A. ② =(1-L A② ) / (L A② +L A③ Reference point ③ is configured with a correction factor a relative to target point A. ③ =(1-L A③ ) / (L A② +L A③ ).

[0047] In another case, if two reference points (such as...) Figure 4 Reference point ④, reference point ⑤) and target point (e.g. Figure 4 The line connecting the target point A) is parallel to the electrode strip direction and intersects the two broken lines of the nearest trajectory. Considering that the current collector coating is continuous and smooth, the density is theoretically continuous and there is no large jump. Therefore, the distances between the two reference points and the target point are added together to obtain the second total length.

[0048] For any one of the two reference points, calculate the ratio between the second length deviation and the second total length, and use it as the correction coefficient for any reference point relative to the target point; the second length deviation is the difference between 1 and the distance between any reference point and the target point.

[0049] Let L be the distance between target point A and reference point ④. A④ The distance between target point A and reference point ⑤ is L. A⑤ Then, the correction factor a relative to the target point A is set at reference point ④. ④ =(1-L A④ ) / (L A④ +L A⑤ Reference point ⑤ is configured with a correction factor a relative to target point A. ⑤ =(1-L A⑤ ) / (L A④ +L A⑤).

[0050] Step 2042: Use a correction factor to correct the actual surface density of the reference point to the reference surface density.

[0051] In this embodiment, the actual surface density of each reference point can be corrected to the reference surface density relative to the target point using correction coefficients corresponding to each reference point in a linear or nonlinear manner.

[0052] For example, the product between the correction factor and the actual areal density of the reference point can be calculated as the reference areal density.

[0053] Step 205: Based on the positional relationship between the target point and the reference point, fuse the reference surface density of the reference point into the target surface density of the target point.

[0054] When selecting reference points, the positional relationship between the target point and multiple reference points macroscopically represents the positional distribution between the target point and multiple reference points. Based on this, the distribution law of the coating surface density of the positive and negative electrode sheets of the battery can be followed, and the reference surface density of the reference points can be fused into the target surface density of the target point using linear or nonlinear methods.

[0055] In practice, the reference point can be assigned a weight based on the positional relationship between the target point and the reference point. This weight represents the importance of the reference point relative to the target point.

[0056] In one case, if the target point (e.g.) Figure 4 Target point A) and reference point (e.g. Figure 4 The line connecting the reference points ① is perpendicular to the electrode banding direction, taking into account the reference points (such as...). Figure 4 Reference point ①) and target point (e.g. Figure 4 If target point A) also has consistency issues with the equipment, then the first value will be configured as the reference point (e.g., ...). Figure 4 The weight of the reference point ①).

[0057] In another case, if two reference points (such as...) Figure 4 Reference points ② and ③ are two broken lines on the trajectory that intersect the target point (e.g., ...). Figure 4 The target point A) is the two closest points, taking into account the reference point (e.g., Figure 4 Reference point ②, reference point ③) and target point (e.g. Figure 4 If target point A) has a spatial proximity relationship, then the second value will be configured as both reference points (e.g., ...). Figure 4 The weights of reference points ② and ③.

[0058] In yet another case, if two reference points (such as...) Figure 4 Reference point ④, reference point ⑤) and target point (e.g. Figure 4The line connecting the target point A) is parallel to the polarization direction and intersects the two broken lines of the nearest trajectory, taking into account the reference point (e.g., Figure 4 Reference point ④, reference point ⑤) and target point (e.g. Figure 4 If target point A) is affected by equipment consistency issues due to coating at the same end position, then the third value will be configured as two reference points simultaneously (e.g., Figure 4 The weights of reference points ④ and ⑤.

[0059] Among them, the first value is greater than the third value, and the third value is greater than the second value.

[0060] Generally, the sum of the weights of all reference points is 1, such as the first value being 0.3, the second value being 0.1, the third value being 0.25, and so on.

[0061] For all reference points, the target surface density of the target point is obtained by adding the product of the reference surface density of the reference point and the weight of the reference point.

[0062] like Figure 4 As shown, the target surface density σ at target point A A =w ① α ① σ ① +w ② α ② σ ② +w ③ α ③ σ ③ +w ④ α ④ σ ④ +w ⑤ α ⑤ σ ⑤ , σ ① For the actual surface density of reference point ①, σ ② For the actual surface density of reference point ②, σ ③ For the actual surface density of reference point ③, σ ④ For the actual surface density of reference point ④, σ ⑤ For the actual surface density of reference point ⑤, α ① α is the correction factor for reference point ①. ② α is the correction factor for reference point ②. ③ α is the correction factor for reference point ③. ④ α is the correction factor for reference point ④. ⑤ w is the correction factor for reference point ⑤. ① For the weight of reference point ①, w ② For the weight of reference point ②, w ③ For the weight of reference point ③, w ④ For the weight of reference point ④, w ⑤The weight of reference point ⑤.

[0063] In this embodiment, the trajectory generated by the measuring instrument during line scanning of the coating on the battery electrode is acquired; a target point located outside the trajectory is determined in the coating; multiple reference points are set for the target point on the trajectory; the reference points have the actual areal density detected by the measuring instrument; the actual areal density of the reference points is corrected to the reference areal density based on the positional relationship between the target point and the reference points; the reference areal densities of the reference points are fused to the target areal density of the target point based on the positional relationship between the target point and the reference points. This embodiment fits the target areal density based on the actual areal density of the reference points on the line scanning trajectory surrounding the target point. Because the current collector coating is continuous and smooth, the areal density is theoretically continuous and does not have large jumps. The reference points in multiple directions provide rich areal density distribution information, which can improve the accuracy of fitting the target areal density of the target point, effectively complete the areal density data of the entire electrode area, improve the accuracy of determining the NP ratio matching state of each corresponding position of the electrode, thereby improving the detection and prevention capabilities of areal density anomalies and improving the quality control of the cell manufacturing process.

[0064] Furthermore, the fitting process relies on program execution and does not require investment in new equipment or modification of existing equipment, making it low-cost and easy to promote.

[0065] It should be noted that the sequence number of each step in the above embodiments 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 the present invention.

[0066] Reference Figure 8 The diagram illustrates a device for detecting the areal density of battery electrode coatings according to an embodiment of the present invention, which may specifically include the following modules: The line scan trajectory acquisition module 801 is used to acquire the trajectory generated when the measuring instrument performs a line scan on the coating on the battery electrode sheet; The target point determination module 802 is used to determine target points located outside the trajectory in the coating process; The reference point setting module 803 is used to set multiple reference points for the target point on the trajectory; the reference points have the actual surface density detected by the measuring instrument. Reference point correction module 804 is used to correct the actual surface density of the reference point to the reference surface density based on the positional relationship between the target point and the reference point; The target surface density fusion module 805 is used to fuse the reference surface density of the reference point into the target surface density of the target point based on the positional relationship between the target point and the reference point.

[0067] In one embodiment of the present invention, the reference point setting module 803 includes: The first point determination module is used to draw a first straight line perpendicular to the direction of the electrode strip through the target point, and determine the intersection of the first straight line and the trajectory as a reference point; The second point determination module is used to determine the two points on the trajectory that are closest to the target point as reference points; The third point determination module is used to draw a second straight line parallel to the direction of the electrode strip through the target point, and determine the two closest intersection points between the second straight line and the trajectory as reference points.

[0068] In one embodiment of the present invention, the reference point correction module 804 includes: The correction coefficient configuration module is used to configure a correction coefficient relative to the target point for the reference point based on the positional relationship between the target point and the reference point. The actual surface density correction module is used to correct the actual surface density of the reference point to the reference surface density using the correction coefficient.

[0069] In one embodiment of the present invention, the correction coefficient configuration module includes: The die head position determination module is used to determine the first position of the target point and the second position of the reference point in the die head if the line connecting the target point and the reference point is perpendicular to the electrode strip carrying direction; The areal density deviation value query module is used to query the first areal density deviation value corresponding to the first position and the second areal density deviation value corresponding to the second position; the first areal density deviation value represents the ratio between the average areal density at the first position and the standard areal density, and the second areal density deviation value represents the ratio between the average areal density at the second position and the standard areal density. The deviation ratio calculation module is used to calculate the ratio between the first surface density deviation value and the second surface density deviation value, and to configure a correction coefficient relative to the target point as the reference point.

[0070] In another embodiment of the present invention, the correction coefficient configuration module includes: The first total length calculation module is used to add the distances between the two reference points and the target point if the two reference points are the two points on the trajectory that are closest to the target point, in order to obtain the first total length. The first length ratio calculation module is used to calculate the ratio between the first length deviation and the first total length for any one of the two reference points, as a correction coefficient for any one of the reference points relative to the target point; the first length deviation is the difference between 1 and the distance between any one of the reference points and the target point.

[0071] In yet another embodiment of the present invention, the correction coefficient configuration module includes: The second total length calculation module is used to add the distances between the two reference points and the target point to obtain the second total length if the line connecting the two reference points and the target point is parallel to the polarity direction and intersects at the nearest trajectory. The second length ratio calculation module is used to calculate the ratio between the second length deviation and the second total length for any one of the two reference points, as a correction coefficient for any one of the reference points relative to the target point; the second length deviation is the difference between 1 and the distance between any one of the reference points and the target point.

[0072] In one embodiment of the present invention, the actual surface density correction module includes: The coefficient multiplication module is used to calculate the product between the correction coefficient and the actual surface density of the reference point, which is then used as the reference surface density.

[0073] In one embodiment of the present invention, the target surface density fusion module 805 includes: The weight configuration module is used to configure weights for the reference point based on the positional relationship between the target point and the reference point; The weight multiplication module is used to add the product between the reference surface density of the reference point and the weight of the reference point to obtain the target surface density of the target point.

[0074] In one embodiment of the present invention, the weight configuration module includes: The first numerical configuration module is used to configure the first numerical value as the weight of the reference point if the line connecting the target point and the reference point is perpendicular to the electrode stripping direction. The second numerical configuration module is used to configure the second numerical value as the weight of the two reference points if the two reference points are the two points on the trajectory that are closest to the target point. The third numerical configuration module is used to configure the third numerical value as the weight of the two reference points if the line connecting the two reference points and the target point is parallel to the polarity direction and intersects at the nearest trajectory. Wherein, the first value is greater than the third value, and the third value is greater than the second value.

[0075] The present invention provides an apparatus for detecting the surface density of battery electrode coatings. By using the apparatus for detecting the surface density of battery electrode coatings, the various steps in the aforementioned method embodiments for detecting the surface density of battery electrode coatings can be implemented.

[0076] It should be noted that the module division in the various devices for detecting the areal density of battery electrode coatings provided in the above embodiments is illustrative and only represents a logical functional division. In actual implementation, other division methods may also be used. Furthermore, the functional modules in the various embodiments of this invention can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0077] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of the embodiments of the present invention can be embodied in the form of a computer program product, which is stored in a computer storage medium and includes several instructions to cause an electronic device or processor to execute all or part of the steps of the methods in the various embodiments of the present invention. The aforementioned computer storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] Furthermore, the apparatus for detecting the surface density of battery electrode coatings provided in the above embodiments and the method for detecting the surface density of battery electrode coatings belong to the same concept. For details of their implementation, please refer to the method embodiments, which will not be repeated here.

[0079] Reference Figure 9 The diagram illustrates an electronic device according to an embodiment of the present invention. Figure 9 As shown, the electronic device in this embodiment of the invention includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the method embodiment for detecting the areal density of battery electrode coatings described above. Alternatively, when the processor executes the computer program, it implements the functions of each module in the apparatus embodiment for detecting the areal density of battery electrode coatings described above.

[0080] For example, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete this application. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which can be used to describe the execution process of the computer program in the electronic device.

[0081] The electronic device may be a desktop computer, a cloud server, or other computing device. The electronic device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that... Figure 9 This is merely one example of an electronic device and does not constitute a limitation on the electronic device. It may include more or fewer components than illustrated, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0082] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0083] The memory can be an internal storage unit of the electronic device, such as a hard drive or RAM. Alternatively, it can be an external storage device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, etc. Furthermore, the memory can include both internal and external storage units. The memory is used to store the computer program and other programs and data required by the electronic device. The memory can also be used to temporarily store data that has been output or will be output.

[0084] This invention also discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for detecting the areal density of battery electrode coating as described in the foregoing embodiments.

[0085] This invention also discloses a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for detecting the areal density of battery electrode coating as described in the foregoing embodiments.

[0086] This invention also discloses a computer program product that, when run on a computer, causes the computer to execute the method for detecting the areal density of battery electrode coatings as described in the foregoing embodiments.

[0087] The embodiments described above are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for detecting the areal density of battery electrode coatings, characterized in that, include: Acquire the trajectory generated when the measuring instrument performs a line scan on the coating on the battery electrode; Determine target points located outside the trajectory during the coating process; Multiple reference points are set for the target point on the trajectory; the reference points have the actual surface density detected by the measuring instrument. Based on the positional relationship between the target point and the reference point, the actual surface density of the reference point is corrected to the reference surface density; The reference surface density of the reference point is fused into the target surface density of the target point based on the positional relationship between the target point and the reference point.

2. The method according to claim 1, characterized in that, The step of setting multiple reference points for the target point on the trajectory includes: Draw a first straight line perpendicular to the direction of the electrode strip through the target point, and determine the intersection of the first straight line and the trajectory as a reference point; On the trajectory, determine the two points closest to the target point as reference points; Draw a second straight line parallel to the direction of the electrode strip through the target point, and determine the two closest intersection points between the second straight line and the trajectory as reference points.

3. The method according to claim 1, characterized in that, The step of correcting the actual surface density of the reference point to a reference surface density based on the positional relationship between the target point and the reference point includes: Based on the positional relationship between the target point and the reference point, a correction coefficient is configured for the reference point relative to the target point; The actual surface density of the reference point is corrected to the reference surface density using the correction factor.

4. The method according to claim 3, characterized in that, The step of configuring a correction coefficient relative to the target point for the reference point based on the positional relationship between the target point and the reference point includes: If the line connecting the target point and the reference point is perpendicular to the direction of the electrode strip, then the target point is determined to be at a first position on the die head and the reference point is determined to be at a second position on the die head. Query the first surface density deviation value corresponding to the first position and the second surface density deviation value corresponding to the second position; the first surface density deviation value represents the ratio between the average surface density at the first position and the standard surface density, and the second surface density deviation value represents the ratio between the average surface density at the second position and the standard surface density; The ratio between the first surface density deviation value and the second surface density deviation value is calculated and used as a correction coefficient relative to the target point for the reference point.

5. The method according to claim 3, characterized in that, The step of configuring a correction coefficient relative to the target point for the reference point based on the positional relationship between the target point and the reference point includes: If the two reference points are the two points on the trajectory that are closest to the target point, then the distances between the two reference points and the target point are added together to obtain the first total length; For any one of the two reference points, the ratio between the first length deviation and the first total length is calculated as a correction coefficient for any one of the reference points relative to the target point; the first length deviation is the difference between 1 and the distance between any one of the reference points and the target point.

6. The method according to claim 3, characterized in that, The step of configuring a correction coefficient relative to the target point for the reference point based on the positional relationship between the target point and the reference point includes: If the line connecting the two reference points and the target point is parallel to the electrode strip direction and intersects at the nearest trajectory, then the distances between the two reference points and the target point are added together to obtain the second total length. For any one of the two reference points, the ratio between the second length deviation and the second total length is calculated as a correction coefficient for any one of the reference points relative to the target point; the second length deviation is the difference between 1 and the distance between any one of the reference points and the target point.

7. The method according to any one of claims 1-6, characterized in that, The step of fusing the reference surface density of the reference point into the target surface density of the target point based on the positional relationship between the target point and the reference point includes: Assign weights to the reference point based on the positional relationship between the target point and the reference point; The target surface density of the target point is obtained by adding the product of the reference surface density of the reference point and the weight of the reference point.

8. The method according to claim 7, characterized in that, Assigning weights to the reference point based on the positional relationship between the target point and the reference point includes: If the line connecting the target point and the reference point is perpendicular to the electrode strip direction, then the first value is configured as the weight of the reference point; If the two reference points are the two points on the trajectory that are closest to the target point, then the second value is configured as the weight of both reference points. If the line connecting the two reference points and the target point is parallel to the electrode stripping direction and intersects at the nearest trajectory, then the third value is simultaneously configured as the weight of the two reference points. Wherein, the first value is greater than the third value, and the third value is greater than the second value.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for detecting the areal density of battery electrode coating as described in any one of claims 1-8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for detecting the areal density of battery electrode coating as described in any one of claims 1-8.

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