Battery electrode alignment detection method, device, equipment, medium and product

Abstract

The embodiments of the present application provide a method, device, equipment, medium and product for detecting the alignment of battery pole pieces. The method includes: obtaining the depth distance of a target cross section of the battery pole piece after lamination, the target cross section being perpendicular to the pole piece setting direction of the battery pole piece, and the depth distance of the target cross section including the depth distance corresponding to each pole piece; determining the alignment detection result of the battery pole piece according to the depth distance of the target cross section. According to the embodiments of the present application, the depth distance of the target cross section of the battery pole piece can be obtained after the battery pole piece lamination is formed, and the depth distance of the target cross section can include the depth distance corresponding to each pole piece. The overall alignment of the battery pole piece after lamination can be determined based on the depth distance corresponding to each pole piece. The battery pole piece that passes the test can be used for subsequent manufacturing processes, and the battery pole piece that fails the test can be disposed of, thereby ensuring the quality of the battery and improving the yield rate of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery detection technology, and in particular to a method, device, equipment, medium and product for detecting the alignment of battery pole pieces. Background Art

[0002] Generally speaking, batteries can be manufactured using two processes: winding and lamination. Lamination can include a zigzag lamination process, which involves the left-right movement of a lamination table to achieve lamination and diaphragm coating of the electrodes. To ensure the safety of laminated batteries, it is often necessary to test the alignment of the positive and negative electrodes.

[0003] In related technologies, the electrode alignment detection is usually carried out during the stacking process. There is a lack of methods to perform overall detection of the alignment of the battery electrodes after stacking. As a result, after stacking is completed, the overall alignment of the battery electrodes is often difficult to ensure, which in turn affects the battery quality. Summary of the Invention

[0004] The embodiments of the present application provide a method, device, equipment, medium and product for detecting the alignment of battery pole pieces to solve the technical problem that the overall alignment of battery pole pieces after lamination is often difficult to ensure, thereby affecting the quality of the battery.

[0005] In a first aspect, the present application provides a method for detecting alignment of battery electrodes, comprising:

[0006] Obtaining the depth distance of a target cross section of the battery electrode after lamination, where the target cross section is perpendicular to the electrode arrangement direction of the battery electrode, and the depth distance of the target cross section includes the depth distance corresponding to each electrode;

[0007] The alignment test results of the battery pole pieces are determined based on the depth distance of the target section.

[0008] In this way, the depth distance of the target cross-section of the battery electrode can be obtained after the battery electrode stack is formed. Since the target cross-section is perpendicular to the electrode setting direction of the battery electrode, the target cross-section includes each electrode of the battery electrode. The depth distance of the target cross-section can include the depth distance corresponding to each electrode. The overall alignment of the battery electrode after stacking can be determined through the depth distance corresponding to each electrode. The battery electrode that passes the inspection can execute the subsequent manufacturing process, and the battery electrode that fails the inspection can be discharged for waste treatment, thereby ensuring the quality of the battery and improving the battery yield.

[0009] In some embodiments, determining the alignment test result of the battery electrode sheet according to the depth distance of the target cross section includes:

[0010] According to the depth distances of the N marking points included in the target cross section, the peak points and the trough points among the N marking points are determined to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to the N pole pieces, N is an integer greater than 1, and P and Q are both positive integers;

[0011] The alignment test result of the battery electrode is determined based on the position information of the P peak points and the Q trough points.

[0012] In this embodiment, the peak points and trough points in the battery pole piece can be determined by the depth distance of N marking points, and then the arrangement and setting of each pole piece in the battery pole piece can be more intuitively reflected based on the position information of the peak points and trough points, thereby determining the alignment detection result of the battery pole piece more quickly and accurately.

[0013] In some embodiments, according to the depth distances of the N marking points included in the target cross section, the peak points and the trough points among the N marking points are determined to obtain P peak points and Q trough points, including:

[0014] Divide the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to the positive electrode sheet and at least one marking point corresponding to the negative electrode sheet;

[0015] According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

[0016] In this embodiment, the target cross section is divided into M regions, and then the peak points and trough points in each region are first determined. The peak points and trough points in the M regions are then summarized to obtain P peak points and Q trough points of the battery electrode. On the one hand, regional division can reduce the number of marking points in each region, effectively reducing the difficulty of determining the peak points and trough points, thereby improving the efficiency of determining the peak points and trough points in the battery electrode. On the other hand, regional division can reduce the influence of the tilt of the battery electrode on the determination of the peak points and trough points, and can more accurately determine the peak points and trough points from the N marking points of the target cross section, thereby ensuring the accuracy of the subsequent battery electrode alignment test results.

[0017] In some embodiments, after determining the peak points and the trough points among the N marking points according to the depth distances of the N marking points included in the target cross section to obtain P peak points and Q trough points, the method further includes:

[0018] Determine, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet preset depth conditions;

[0019] Based on the position information of P peak points and Q trough points, the alignment test results of the battery electrode are determined, including:

[0020] The alignment test result of the battery electrode is determined based on the position information of the target peak point and the target trough point.

[0021] In this embodiment, the abnormal points among the P peak points and Q trough points can be filtered out first, and the alignment detection results of the battery pole pieces can be determined based on the position information of the filtered target peak points and target trough points, which can further improve the accuracy of the alignment detection results of the battery pole pieces.

[0022] In some embodiments, determining a target peak point and a target trough point whose depth distances satisfy a preset depth condition among the P peak points and the Q trough points includes:

[0023] Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval;

[0024] A target trough point among the Q trough points is determined, where the depth distance of the target trough point is in a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

[0025] In this embodiment, abnormal peak points among P peak points and abnormal trough points among Q trough points can be filtered out separately, thereby ensuring the accuracy of filtering abnormal points and obtaining more accurate target peak points and target trough points, so that the accuracy can be further improved when the alignment detection results of the battery pole pieces are subsequently determined according to the position information of the target peak points and the target trough points.

[0026] In some embodiments, determining the alignment test result of the battery electrode sheet based on the position information of the P peak points and the Q trough points includes:

[0027] Determine, based on the position information of the P peak points and the Q trough points, whether the P peak points and the Q trough points are arranged according to a preset rule;

[0028] When the P peak points and the Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode is qualified.

[0029] In this embodiment, the alignment detection result of the battery electrode can be determined more intuitively and quickly based on whether the P peak points and Q trough points are arranged according to preset rules, thereby effectively improving the efficiency of alignment detection while ensuring accuracy.

[0030] In some embodiments, when the P peak points and the Q trough points are arranged according to a preset rule, determining that the alignment test result of the battery electrode sheet is qualified includes:

[0031] When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to the depth distances of the P peak points and the depth distances of the Q trough points;

[0032] When the P peak points and the Q trough points meet the preset misalignment conditions, the alignment test result of the battery electrode is determined to be qualified.

[0033] In this embodiment, the alignment detection results of the battery electrodes can be determined from two dimensions. One is to consider the safety performance of the battery electrodes and judge whether the positive electrode completely covers the negative electrode. The other is to consider the electrical performance of the battery electrodes based on the neatness of the positive electrode and the negative electrode, which further improves the accuracy of the alignment detection results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0034] In some embodiments, when the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition based on the depth distance of the P peak points and the depth distance of the Q trough points includes:

[0035] When P peak points and Q trough points are arranged according to a preset rule, the misalignment of the depth distance between the marked point corresponding to the i-th electrode piece of the battery electrode and the marked point corresponding to the i+1-th electrode piece is obtained, where i is a positive integer;

[0036] When the misalignment amounts are all within the preset misalignment amount range, it is determined that the P peak points and the Q trough points meet the preset misalignment conditions.

[0037] In this embodiment, by respectively judging whether the misalignment of the depth distance between the marking point corresponding to the i-th electrode and the marking point corresponding to the i+1-th electrode of the battery electrode are both within the preset misalignment range, and then determining whether the P peak points and Q trough points meet the preset misalignment conditions, the neatness factor of the positive electrode and the negative electrode can be more fully considered, and the accuracy of the alignment detection results is further improved, so that the subsequent battery yield based on qualified battery electrodes is higher.

[0038] In some embodiments, before determining the alignment test result of the battery electrode sheet based on the position information of the P peak points and the Q trough points, the method further includes:

[0039] According to the position information of P peak points, the peak straight line is obtained by fitting;

[0040] Calculate the inclination of the battery electrode according to the crest straight line;

[0041] When P peak points and Q trough points are arranged according to a preset rule, the alignment test result of the battery electrode is determined to be qualified, including:

[0042] When the tilt amount is less than or equal to a preset threshold value, and the P peak points and Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

[0043] In this embodiment, the alignment test results of the battery electrodes can be determined from two dimensions: the overall inclination of the battery electrodes and whether the positive electrode completely covers the negative electrode. This can further improve the accuracy of the alignment test results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0044] In some embodiments, obtaining the depth distance of a target cross section of a battery electrode sheet after lamination formation includes:

[0045] When receiving the information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, the first direction being parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged;

[0046] According to the image, the depth distance of the target cross section of the battery electrode is determined.

[0047] In this embodiment, upon receiving information that the battery electrode sheets have been stacked, the camera can be controlled to capture an image of the battery electrode sheets, thereby obtaining the depth distance of the target cross-section of the battery electrode sheets. This allows for automated alignment testing of the battery electrode sheets after stacking, simplifies the testing process, and effectively improves testing efficiency.

[0048] In a second aspect, according to the present application, a battery electrode alignment detection device is provided, comprising:

[0049] An acquisition module is used to obtain the depth distance of a target cross section of the battery electrode after lamination, where the target cross section is perpendicular to the electrode arrangement direction of the battery electrode, and the depth distance of the target cross section includes the depth distance corresponding to each electrode;

[0050] The detection module is used to determine the alignment detection result of the battery electrode according to the depth distance of the target section.

[0051] In this embodiment, the battery electrode alignment detection device can obtain the depth distance of the target cross-section of the battery electrode after the battery electrode stack is formed. Since the target cross-section is perpendicular to the electrode setting direction of the battery electrode, the target cross-section includes each electrode of the battery electrode. The depth distance of the target cross-section can include the depth distance corresponding to each electrode. The overall alignment of the battery electrode after stacking can be determined through the depth distance corresponding to each electrode. The battery electrode that passes the inspection can execute the subsequent manufacturing process, and the battery electrode that fails the inspection can be discharged for waste treatment, thereby ensuring the quality of the battery and improving the battery yield.

[0052] In some embodiments, the detection module includes:

[0053] A first determining unit is configured to determine, based on depth distances of the N marking points included in the target cross section, peak points and trough points among the N marking points, to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to the N pole pieces, N is an integer greater than 1, and P and Q are both positive integers;

[0054] The second determining unit is used to determine the alignment detection result of the battery electrode according to the position information of the P peak points and the Q trough points.

[0055] In this embodiment, the peak points and trough points in the battery pole piece can be determined by the depth distance of N marking points, and then the arrangement and setting of each pole piece in the battery pole piece can be more intuitively reflected based on the position information of the peak points and trough points, thereby determining the alignment detection result of the battery pole piece more quickly and accurately.

[0056] In some embodiments, the first determining unit is further configured to:

[0057] Divide the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to the positive electrode sheet and at least one marking point corresponding to the negative electrode sheet;

[0058] According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

[0059] In this embodiment, the target cross section is divided into M regions, and then the peak points and trough points in each region are first determined. The peak points and trough points in the M regions are then summarized to obtain P peak points and Q trough points of the battery electrode. On the one hand, regional division can reduce the number of marking points in each region, effectively reducing the difficulty of determining the peak points and trough points, thereby improving the efficiency of determining the peak points and trough points in the battery electrode. On the other hand, regional division can reduce the influence of the tilt of the battery electrode on the determination of the peak points and trough points, and can more accurately determine the peak points and trough points from the N marking points of the target cross section, thereby ensuring the accuracy of the subsequent battery electrode alignment test results.

[0060] In some embodiments, the battery electrode alignment detection device further includes:

[0061] A determination module is used to determine, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet a preset depth condition;

[0062] The second determining unit is further configured to determine the alignment detection result of the battery electrode according to the position information of the target peak point and the target trough point.

[0063] In this embodiment, the abnormal points among the P peak points and Q trough points can be filtered out first, and the alignment detection results of the battery pole pieces can be determined based on the position information of the filtered target peak points and target trough points, which can further improve the accuracy of the alignment detection results of the battery pole pieces.

[0064] In some embodiments, the determination module is further configured to:

[0065] Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval;

[0066] A target trough point among the Q trough points is determined, where the depth distance of the target trough point is in a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

[0067] In this embodiment, abnormal peak points among P peak points and abnormal trough points among Q trough points can be filtered out separately, thereby ensuring the accuracy of filtering abnormal points and obtaining more accurate target peak points and target trough points, so that the accuracy can be further improved when the alignment detection results of the battery pole pieces are subsequently determined according to the position information of the target peak points and the target trough points.

[0068] In some embodiments, the second determining unit includes:

[0069] A first determining subunit is configured to determine whether the P peak points and the Q trough points are arranged according to a preset rule based on position information of the P peak points and the Q trough points;

[0070] The second determining subunit is used to determine that the alignment test result of the battery electrode is qualified when the P peak points and the Q trough points are arranged according to a preset rule.

[0071] In this embodiment, the alignment detection result of the battery electrode can be determined more intuitively and quickly based on whether the P peak points and Q trough points are arranged according to preset rules, thereby effectively improving the efficiency of alignment detection while ensuring accuracy.

[0072] In some embodiments, the second determining subunit is further configured to:

[0073] When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to the depth distances of the P peak points and the depth distances of the Q trough points;

[0074] When the P peak points and the Q trough points meet the preset misalignment conditions, the alignment test result of the battery electrode is determined to be qualified.

[0075] In this embodiment, the alignment detection results of the battery electrodes can be determined from two dimensions. One is to consider the safety performance of the battery electrodes and judge whether the positive electrode completely covers the negative electrode. The other is to consider the electrical performance of the battery electrodes based on the neatness of the positive electrode and the negative electrode, which further improves the accuracy of the alignment detection results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0076] In some embodiments, the second determining subunit is further configured to:

[0077] When P peak points and Q trough points are arranged according to a preset rule, the misalignment of the depth distance between the marked point corresponding to the i-th electrode piece of the battery electrode and the marked point corresponding to the i+1-th electrode piece is obtained, where i is a positive integer;

[0078] When the misalignment amounts are all within the preset misalignment amount range, it is determined that the P peak points and the Q trough points meet the preset misalignment conditions.

[0079] In this embodiment, by respectively judging whether the misalignment of the depth distance between the marking point corresponding to the i-th electrode and the marking point corresponding to the i+1-th electrode of the battery electrode are both within the preset misalignment range, and then determining whether the P peak points and Q trough points meet the preset misalignment conditions, the neatness factor of the positive electrode and the negative electrode can be more fully considered, and the accuracy of the alignment detection results is further improved, so that the subsequent battery yield based on qualified battery electrodes is higher.

[0080] In some embodiments, the battery electrode alignment detection device further includes:

[0081] A fitting module is used to fit the peak line according to the position information of P peak points;

[0082] A calculation module is used to calculate the inclination of the battery electrode according to the crest straight line;

[0083] The second determining subunit is further configured to:

[0084] When the tilt amount is less than or equal to a preset threshold value, and the P peak points and Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

[0085] In this embodiment, the alignment test results of the battery electrodes can be determined from two dimensions: the overall inclination of the battery electrodes and whether the positive electrode completely covers the negative electrode. This can further improve the accuracy of the alignment test results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0086] In some embodiments, the acquisition module is further configured to:

[0087] When receiving the information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, the first direction being parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged;

[0088] According to the image, the depth distance of the target cross section of the battery electrode is determined.

[0089] In this embodiment, upon receiving information that the battery electrode sheets have been stacked, the camera can be controlled to capture an image of the battery electrode sheets, thereby obtaining the depth distance of the target cross-section of the battery electrode sheets. This allows for automated alignment testing of the battery electrode sheets after stacking, simplifies the testing process, and effectively improves testing efficiency.

[0090] In a third aspect, an embodiment of the present application provides an electronic device, the device comprising:

[0091] a processor and a memory storing programs or instructions;

[0092] The above method is implemented when the processor executes the program or instruction.

[0093] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and the program or instruction implements the above method when executed by a processor.

[0094] In a fifth aspect, an embodiment of the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the above method.

[0095] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0097] Figure 1 This is a flow chart of a method for detecting battery electrode alignment provided by one embodiment of the present application;

[0098] Figure 2 This is a schematic diagram of the structure of the battery electrode provided in an embodiment of the present application;

[0099] Figure 3 1 is a schematic structural diagram of a target cross section in a battery electrode alignment detection method provided in an embodiment of the present application;

[0100] Figure 4 Schematic diagram of peak and valley curves in the battery electrode alignment detection method provided in an embodiment of the present application;

[0101] Figure 5 Schematic diagram of the principle of the lamination process provided in the embodiment of the present application;

[0102] Figure 6 This is a schematic diagram of a scenario embodiment of the battery electrode alignment detection method provided in an embodiment of the present application;

[0103] Figure 7 is a structural schematic diagram of a battery electrode alignment detection device provided by another embodiment of the present application;

[0104] Figure 8 This is a structural diagram of an electronic device provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0105] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0106] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0107] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0108] A battery cell includes a battery electrode sheet and an electrolyte. The electrode sheet is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collector uncoated with the positive active material layer, after being stacked, serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collector uncoated with the negative active material layer, after being stacked, serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. The material of the isolation film can be PP (polypropylene) or PE (polyethylene), etc. In addition, the battery pole piece can be a wound structure or a laminated structure. In the embodiment of the present application, the battery pole piece can be a Z-shaped laminated structure.

[0109] It is understandable that in order to ensure the safety performance of the battery electrodes, it is often necessary to test the alignment between the positive and negative electrodes to ensure that the negative electrodes are staggered with the positive electrodes and that the positive electrodes completely cover the negative electrodes. In the embodiment of the present application, a diaphragm is provided on both sides of the positive electrode sheet, and the diaphragm completely covers the positive electrode sheet. In the Z-shaped lamination process, the lamination table moves left and right so that the positive electrode sheet is folded in a Z-shape, and the negative electrode sheet is arranged in the Z-shaped structure of the positive electrode sheet, so that the positive electrode sheet and the negative electrode sheet are staggered.

[0110] In the related art, images can be continuously captured during the lamination process, and the edges of the negative electrode sheet, positive electrode sheet, separator, and reference object can be extracted from the images. Using the edge of the reference object as a reference, the relative distance between the edge of the negative electrode sheet and the edge of the positive electrode sheet is obtained, and the alignment of the negative and positive electrode sheets can be detected. It can be seen that the related art usually detects the alignment of the electrode sheets during the lamination process, but there is a lack of methods for overall detection of the alignment of the battery electrode sheets after lamination. As a result, after lamination is completed, the overall alignment of the battery electrode sheets is often difficult to ensure, which in turn affects the quality of the battery.

[0111] To address the above issues, the present invention provides a method, device, equipment, medium, and product for detecting the alignment of battery pole pieces after lamination. The following first introduces the method for detecting the alignment of battery pole pieces provided by the present invention.

[0112] Please refer to Figure 1 , Figure 1FIG1 is a flow chart of a method for detecting alignment of battery electrodes provided by an embodiment of the present application. The method for detecting alignment of battery electrodes may include the following steps:

[0113] Step 101, obtaining a depth distance of a target cross section of a battery electrode after lamination, wherein the target cross section is perpendicular to a direction in which the electrode is arranged, and the depth distance of the target cross section includes a depth distance corresponding to each electrode;

[0114] Step 102: Determine the alignment test result of the battery electrode according to the depth distance of the target cross section.

[0115] In this way, the depth distance of the target cross-section of the battery electrode can be obtained after the battery electrode stack is formed. Since the target cross-section is perpendicular to the electrode setting direction of the battery electrode, the target cross-section includes each electrode of the battery electrode. The depth distance of the target cross-section can include the depth distance corresponding to each electrode. The overall alignment of the battery electrode after stacking can be determined through the depth distance corresponding to each electrode. The battery electrode that passes the inspection can execute the subsequent manufacturing process, and the battery electrode that fails the inspection can be discharged for waste treatment, thereby ensuring the quality of the battery and improving the battery yield.

[0116] In step 101, Figure 2 As shown, the target cross section 202 of the battery electrode 201 is perpendicular to the electrode setting direction of the battery electrode 201 , wherein the target cross section 202 may include cross sections of all positive and negative electrodes of the entire battery electrode 201 .

[0117] The depth distance of the target cross section 202 of the battery electrode sheet 201 after lamination can be obtained by photographing or scanning the side of the battery electrode sheet 201 along a first direction (X) by the sensor 203. The first direction (X) can be parallel to the electrode sheet arrangement direction. The depth distance of the target cross section 202 can refer to the distance between each electrode sheet at the target cross section 202 and the sensor.

[0118] Among them, the sensor may include single-line laser radar, dual-line laser radar, depth camera and other devices that can collect the depth distance of the measured object, which is not specifically limited here.

[0119] In step 102, the alignment test results of the battery electrode sheets can be determined based on the depth distance of the target cross section. It is understood that when the positive electrode sheet of the battery electrode sheet completely covers the negative electrode sheet, the depth distance of the positive electrode sheet of the battery electrode sheet is smaller than the depth distance of the negative electrode sheet. Based on this, the distance between each electrode sheet at the target cross section and the sensor can be used to determine whether the positive electrode sheet completely covers the negative electrode sheet, thereby detecting the overall alignment of the battery electrode sheets and ensuring the safety performance of the battery electrode sheets.

[0120] For example, if the depth distance of an odd number of electrode sheets is within a first interval, and the depth distance of an even number of electrode sheets is within a second interval, and the value ranges of the first interval and the second interval are different, it can be considered that there is an overlapping relationship between the positive electrode sheet and the negative electrode sheet, and the alignment test result of the battery electrode sheets can be determined to be qualified. If the depth distance of any two adjacent electrode sheets is within the first interval or the second interval, it can be considered that there is an incomplete overlapping relationship between the positive electrode sheet and the negative electrode sheet in the battery electrode sheets, and the alignment test result of the battery electrode sheets can be determined to be unqualified.

[0121] In some examples, the number of target cross sections may be one, that is, the alignment of the battery electrode sheets may be detected based on the depth distance of any cross section of the battery electrode sheet that is perpendicular to the electrode arrangement direction of the battery electrode sheet. To improve the accuracy of the detection results, the number of target cross sections may also be multiple, and the alignment detection result of the battery electrode sheets may be determined based on the depth distances of multiple target cross sections. If the depth distance of each target cross section indicates whether the positive electrode sheet completely covers the negative electrode sheet, the alignment detection result of the battery electrode sheets is determined to be qualified.

[0122] For example, the depth distances of N target cross sections of the battery electrode after lamination can be obtained, where N is an integer greater than 1; based on the depth distances of the N target cross sections, N test results corresponding one to one to the N target cross sections are determined; when all N test results are qualified, the alignment test result of the battery electrode is determined to be qualified.

[0123] For example, the depth distances of three target sections on both sides and in the middle of the battery electrode can be obtained respectively. If the test results corresponding to the three target sections are all qualified, the alignment test result of the battery electrode can be considered qualified. In this way, the situation where the position deviation of the electrode during the lamination process affects the alignment test result can be avoided, thereby improving the accuracy of the alignment test result of the battery electrode.

[0124] In some embodiments, step 102 may include the following steps:

[0125] According to the depth distances of the N marking points included in the target cross section, the peak points and the trough points among the N marking points are determined to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to the N pole pieces, N is an integer greater than 1, and P and Q are both positive integers;

[0126] The alignment test result of the battery electrode is determined based on the position information of the P peak points and the Q trough points.

[0127] like Figure 3As shown, the battery electrode 301 may include a positive electrode 3011 and a negative electrode 3012, wherein the positive electrode 3011 is a continuous Z-shaped structure, and the negative electrode 3012 is arranged between the Z-shaped positive electrode 3011. In this embodiment, taking one side of the battery electrode 301 collected by the sensor 303 as an example, the positive electrode between two adjacent negative electrode 3012 can be regarded as a positive electrode, and each electrode can correspond to a marking point, that is, the distance between the marking point and the sensor 303 can be determined as the distance between the electrode corresponding to the marking point and the sensor 303.

[0128] According to the depth distance of the N marking points included in the target section, the peak points and trough points in the N marking points can be determined to obtain P peak points and Q trough points. It can be understood that, if Figure 3 As shown, for the battery electrode 301, the marking point corresponding to the positive electrode 3011 can be a peak point, while the marking point corresponding to the negative electrode 3012 can be a trough point. In other words, the marking point whose depth distance is less than a preset threshold can be determined as a peak point, and the marking point whose depth distance is greater than the preset threshold can be determined as a trough point. The preset threshold can be determined based on the depth distance of N marking points. For example, the preset threshold can be the average of the depth distances of the N marking points. The preset threshold can also be set based on actual conditions based on empirical values, and is not specifically limited here.

[0129] After obtaining the P peak points and Q trough points, the alignment test result of the battery electrode can be determined based on the position information of the P peak points and the Q trough points. It can be understood that a qualified battery electrode has a staggered arrangement of the positive electrode and the negative electrode, and the positive electrode completely covers the negative electrode. Therefore, based on the position information of the P peak points and the Q trough points, it can be determined whether the P peak points and the Q trough points are staggered. If so, the alignment test result of the battery electrode can be considered qualified. If not, the alignment test result of the battery electrode can be considered unqualified.

[0130] In this embodiment, the peak points and trough points in the battery pole piece can be determined by the depth distance of N marking points, and then the arrangement and setting of each pole piece in the battery pole piece can be more intuitively reflected based on the position information of the peak points and trough points, thereby determining the alignment detection result of the battery pole piece more quickly and accurately.

[0131] In some examples, the alignment test result of the battery electrode is determined based on the position information of the P peak points and the Q trough points, which can be generated based on the position information of the P peak points and the Q trough points. Figure 4 The peak and trough curve shown can be input into a pre-trained detection model to obtain the alignment detection result of the battery electrode output by the detection model.

[0132] The detection model can be trained through deep learning based on historical peak-valley curves and historical test results. The historical peak-valley curves can be generated from the location information of peaks and troughs corresponding to historical battery electrodes, and the historical test results can be alignment test results obtained through manual testing of these historical battery electrodes. In this way, using a pre-trained detection model to detect battery electrode alignment can effectively improve detection efficiency.

[0133] In some embodiments, the above-mentioned method of determining the peak points and the trough points among the N marking points according to the depth distances of the N marking points included in the target cross section to obtain P peak points and Q trough points may include the following steps:

[0134] Divide the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to the positive electrode sheet and at least one marking point corresponding to the negative electrode sheet;

[0135] According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

[0136] It is understandable that during the lamination process, the position of the electrode may deviate to a certain extent, resulting in a certain tilt of the battery electrode. In this case, in order to ensure that the peak points and trough points can be accurately determined from the N marking points of the target cross section, the target cross section can be divided into M regions, where each of the M regions can include at least one marking point corresponding to the positive electrode sheet and at least one marking point corresponding to the negative electrode sheet.

[0137] For example, the target cross section can be divided into M regions based on the thickness of the battery electrode and the number of electrode layers. For example, the thickness of the battery electrode can be 50 mm, and the number of electrode layers can be 50. The target cross section can be divided into 10 regions with each region being 5 mm, and each region includes the marking points corresponding to the positive electrode and the negative electrode.

[0138] like Figure 3 As shown, the peak points and valley points in each region 302 can be determined based on the depth distance of the marker points in each region 302. For example, the peak points in the region 302 can be determined first, and then the valley points adjacent to the peak points in the region 302 can be located based on the peak points. It is understood that the valley points in the region 302 can also be determined first, and then the peak points adjacent to the valley points in the region 302 can be located based on the valley points.

[0139] After obtaining the peak points and trough points in each region, all the peak points in the M regions can be determined as P peak points of the battery electrode sheet, and all the trough points in the M regions can be determined as Q trough points of the battery electrode sheet.

[0140] In this embodiment, the target cross section is divided into M regions, and then the peak points and trough points in each region are first determined. The peak points and trough points in the M regions are then summarized to obtain P peak points and Q trough points of the battery electrode. On the one hand, regional division can reduce the number of marking points in each region, effectively reducing the difficulty of determining the peak points and trough points, thereby improving the efficiency of determining the peak points and trough points in the battery electrode. On the other hand, regional division can reduce the influence of the tilt of the battery electrode on the determination of the peak points and trough points, and can more accurately determine the peak points and trough points from the N marking points of the target cross section, thereby ensuring the accuracy of the subsequent battery electrode alignment test results.

[0141] In some embodiments, after determining the peak points and trough points among the N marking points according to the depth distances of the N marking points included in the target cross section, and obtaining P peak points and Q trough points, the battery electrode alignment detection method may further include the following steps:

[0142] Determine, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet preset depth conditions;

[0143] The above-mentioned determination of the alignment test result of the battery electrode sheet based on the position information of the P peak points and the Q trough points may include the following steps:

[0144] The alignment test result of the battery electrode is determined based on the position information of the target peak point and the target trough point.

[0145] In this embodiment, after obtaining P peak points and Q trough points, the target peak points and target trough points whose depth distances meet the preset depth conditions can be determined from the P peak points and Q trough points. For example, if the depth distances of the P peak points and the Q trough points are mostly within a depth distance interval, there are a small number of peak points and / or trough points whose depth distances are not within the depth distance interval, it can be considered that the small number of peak points and / or trough points may be abnormal points caused by other interference factors. In other words, it can be considered that the abnormal points are not the marking points corresponding to the pole pieces and cannot be used to reflect the arrangement and setting of the pole pieces in the battery pole pieces. The target peak points can be the other peak points among the P peak points except the abnormal points, and the target trough points can be the other trough points among the Q trough points except the abnormal points.

[0146] For example, the depth distances of most of the P peak points and Q trough points are in the interval [40,60], among which there is a peak point a with a depth distance of 10, or there is a trough point b with a depth distance of 80, then the peak point a and the trough point b can be determined as abnormal points. In other words, the peak points and trough points other than the peak point a and the trough point b among the P peak points and the Q trough points can be determined as target peak points and target trough points.

[0147] The alignment test result of the battery electrode can be determined based on the position information of the target peak point and the target trough point.

[0148] In this embodiment, the abnormal points among the P peak points and Q trough points can be filtered out first, and the alignment detection results of the battery pole pieces can be determined based on the position information of the filtered target peak points and target trough points, which can further improve the accuracy of the alignment detection results of the battery pole pieces.

[0149] In some embodiments, in the above determination of the P peak points and the Q trough points, the target peak points and the target trough points whose depth distances meet the preset depth conditions may include the following steps:

[0150] Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval;

[0151] A target trough point among the Q trough points is determined, where the depth distance of the target trough point is in a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

[0152] In this embodiment, a target peak point can be determined from among the P peak points. For example, a peak point among the P peak points whose depth distance falls within a first depth distance interval can be determined as the target peak point. The first depth distance interval can be determined based on the depth distances of the P peak points. For example, a first average of the depth distances of the P peak points can be calculated, and the interval whose absolute value of the difference from the first average is less than a preset first value can be used as the first depth distance interval. The first depth distance interval can also be set based on empirical values ​​in accordance with actual conditions and is not specifically limited here.

[0153] A target valley point can be determined from the Q valley points. For example, a valley point among the Q valley points whose depth distance falls within a second depth distance interval can be determined as the target valley point, where the second depth distance interval can be determined based on the depth distances of the Q valley points. For example, a second average of the depth distances of the Q valley points can be calculated, and the interval whose absolute value of the difference from the second average is less than a preset second value is used as the second depth distance interval. The second depth distance interval can also be set based on empirical values ​​in accordance with actual conditions and is not specifically limited here.

[0154] It can be understood that the minimum value of the second depth distance interval can be greater than the maximum value of the first depth distance interval, so that the same marking point may not be the same as the above-mentioned preset first value and the preset second value, or may be different values, which is not specifically limited here.

[0155] In this embodiment, abnormal peak points among P peak points and abnormal trough points among Q trough points can be filtered out separately, thereby ensuring the accuracy of filtering abnormal points and obtaining more accurate target peak points and target trough points, so that the accuracy can be further improved when the alignment detection results of the battery pole pieces are subsequently determined according to the position information of the target peak points and the target trough points.

[0156] In some embodiments, the above-mentioned determination of the alignment test result of the battery electrode sheet based on the position information of the P peak points and the Q trough points may include the following steps:

[0157] Determine, based on the position information of the P peak points and the Q trough points, whether the P peak points and the Q trough points are arranged according to a preset rule;

[0158] When the P peak points and the Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode is qualified.

[0159] In this embodiment, whether the P peak points and the Q trough points are arranged according to a preset rule can be determined based on the position information of the P peak points and the Q trough points, wherein the preset rule can be that the P peak points and the Q trough points are arranged alternately.

[0160] When P peak points and Q trough points are arranged alternately, it can be considered that the positive electrode of the battery plate completely covers the negative electrode, which can meet the safety performance requirements. Therefore, it can be determined that the alignment test result of the battery plate is qualified.

[0161] In this embodiment, the alignment detection result of the battery electrode can be determined more intuitively and quickly based on whether the P peak points and Q trough points are arranged according to preset rules, thereby effectively improving the efficiency of alignment detection while ensuring accuracy.

[0162] In some embodiments, when the P peak points and the Q trough points are arranged according to a preset rule, determining that the alignment test result of the battery electrode sheet is qualified may include the following steps:

[0163] When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to the depth distances of the P peak points and the depth distances of the Q trough points;

[0164] When the P peak points and the Q trough points meet the preset misalignment conditions, the alignment test result of the battery electrode is determined to be qualified.

[0165] In this embodiment, in order to further improve the accuracy of the alignment detection results of the battery pole pieces, when the P peak points and the Q trough points are arranged according to preset rules, it is also possible to determine whether the P peak points and the Q trough points meet the preset misalignment conditions based on the depth distance of the P peak points and the depth distance of the Q trough points.

[0166] For example, the maximum depth distance and the minimum depth distance can be determined from the depth distances of P peak points and the depth distances of Q trough points, and the difference between the maximum depth distance and the minimum depth distance is calculated. If the difference is less than or equal to the preset misalignment threshold, it can be considered that the P peak points and the Q trough points meet the preset misalignment condition. If the difference is greater than the preset misalignment threshold, it can be considered that the P peak points and the Q trough points do not meet the preset misalignment condition.

[0167] The alignment test result of the battery electrode sheet can be determined to be qualified when the P peak points and the Q trough points meet the preset misalignment conditions. For example, if the P peak points and the Q trough points meet the preset misalignment conditions, it can be considered that the positive electrode sheet and the negative electrode sheet are arranged more neatly during the lamination process, and the alignment test result of the battery electrode sheet can be considered qualified at this time. If the P peak points and the Q trough points do not meet the preset misalignment conditions, it can be considered that although the positive electrode sheet of the battery electrode sheet completely covers the negative electrode sheet, the neatness of the arrangement of the positive electrode sheet and the negative electrode sheet is poor, which may have a certain impact on the electrical performance of the battery electrode sheet, and therefore the alignment test result of the battery electrode sheet can be considered unqualified.

[0168] In this embodiment, the alignment detection results of the battery electrodes can be determined from two dimensions. One is to consider the safety performance of the battery electrodes and judge whether the positive electrode completely covers the negative electrode. The other is to consider the electrical performance of the battery electrodes based on the neatness of the positive electrode and the negative electrode, which further improves the accuracy of the alignment detection results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0169] In some embodiments, when the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition based on the depth distances of the P peak points and the depth distances of the Q trough points may include the following steps:

[0170] When P peak points and Q trough points are arranged according to a preset rule, the misalignment of the depth distance between the marked point corresponding to the i-th electrode piece of the battery electrode and the marked point corresponding to the i+1-th electrode piece is obtained, where i is a positive integer;

[0171] When the misalignment amounts are all within the preset misalignment amount range, it is determined that the P peak points and the Q trough points meet the preset misalignment conditions.

[0172] In this embodiment, to determine whether the P peak points and the Q trough points meet the preset misalignment condition, the misalignment amount of the depth distance between the marked point corresponding to the i-th electrode sheet and the marked point corresponding to the i+1-th electrode sheet of the battery electrode can be obtained. In other words, the difference in the depth distance between any two adjacent marked points among the N marked points can be obtained and determined as the misalignment amount of the two marked points. If the misalignment amounts are all within the preset misalignment range, it can be determined that the P peak points and the Q trough points meet the preset misalignment condition.

[0173] The preset misalignment interval can be determined based on the misalignment of the depth distance between all adjacent marking points in the battery electrode. For example, the average misalignment can be calculated first, and the interval where the absolute value of the difference from the average misalignment is less than a preset value is used as the preset misalignment interval. The preset misalignment interval can also be set based on empirical values ​​based on actual conditions, and is not specifically limited here.

[0174] For example, you can obtain "Misalignment Amount 1" for the depth distance between the first and second markers, "Misalignment Amount 2" for the depth distance between the second and third markers, and so on. If "Misalignment Amount 1," "Misalignment Amount 2," ..., and "Misalignment Amount N-1" are all within the preset misalignment range, it can be assumed that the P peak points and Q trough points meet the preset misalignment condition.

[0175] In this embodiment, by respectively judging whether the misalignment of the depth distance between the marking point corresponding to the i-th electrode and the marking point corresponding to the i+1-th electrode of the battery electrode are both within the preset misalignment range, and then determining whether the P peak points and Q trough points meet the preset misalignment conditions, the neatness factor of the positive electrode and the negative electrode can be more fully considered, and the accuracy of the alignment detection results is further improved, so that the subsequent battery yield based on qualified battery electrodes is higher.

[0176] In some embodiments, before determining the alignment test result of the battery electrode sheet based on the position information of the P peak points and the Q trough points, the battery electrode sheet alignment test method may further include the following steps:

[0177] According to the position information of P peak points, the peak straight line is obtained by fitting;

[0178] Calculate the inclination of the battery electrode according to the crest straight line;

[0179] In the case where the P peak points and the Q trough points are arranged according to a preset rule, determining that the alignment test result of the battery electrode sheet is qualified may include the following steps:

[0180] When the tilt amount is less than or equal to a preset threshold value, and the P peak points and Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

[0181] In this embodiment, to further improve the accuracy of the battery electrode alignment test results, a peak line can be fitted based on the position information of the P peak points, and the battery electrode tilt can be calculated based on the peak line. If the tilt is less than or equal to a preset threshold, and the P peak points and Q trough points are arranged according to a preset rule, the battery electrode alignment test result can be considered qualified.

[0182] If the tilt amount is greater than a preset threshold, it can be considered that the overall structure of the battery electrode sheet is difficult to meet the subsequent manufacturing process, and at this time, the alignment test result of the battery electrode sheet can be determined to be unqualified.

[0183] In this embodiment, the alignment test results of the battery electrodes can be determined from two dimensions: the overall inclination of the battery electrodes and whether the positive electrode completely covers the negative electrode. This can further improve the accuracy of the alignment test results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0184] In some embodiments, step 101 may include the following steps:

[0185] When receiving the information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, the first direction being parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged;

[0186] According to the image, the depth distance of the target cross section of the battery electrode is determined.

[0187] See also Figure 5 , when receiving the stacking completion information of the battery electrode 501, the shooting device 503 can be controlled to move along the first direction and shoot the image of the battery electrode 501, wherein the first direction is parallel to the electrode setting direction of the battery electrode 501, and can be the length or width direction of the battery electrode, and the shooting device can be a depth camera.

[0188] For example, the battery electrode 501 is stacked on the stacking table 502, and a cutting device is provided on the stacking table 502. When the stacking process meets the end condition, the cutting device will cut the positive electrode to complete the stacking process. A sensor can be installed on the cutting device. When the cutting device is cutting, the stacking is considered to be completed. At this time, the sensor on the cutting device can send the information generated by the cutting to the programmable logic controller (PLC). The PLC generates stacking completion information in response to the signal and sends it to the host computer. At this time, the PLC can control the depth camera servo to move along the length or width direction of the battery electrode, and at the same time, the host computer controls the depth camera to start taking pictures, shooting the side features of the battery electrode, and obtaining an image of the battery electrode.

[0189] 3D point cloud image data can be formed based on the image, and then the depth distance of the target cross section of the battery electrode can be determined based on the 3D point cloud image data.

[0190] In this embodiment, upon receiving information that the battery electrode sheets have been stacked, the camera can be controlled to capture an image of the battery electrode sheets, thereby obtaining the depth distance of the target cross-section of the battery electrode sheets. This allows for automated alignment testing of the battery electrode sheets after stacking, simplifies the testing process, and effectively improves testing efficiency.

[0191] In order to facilitate understanding of the battery pole piece alignment method provided in the above embodiment, the above battery pole piece alignment method is described below using a specific scenario embodiment. Figure 6 A schematic diagram of a scenario embodiment of the above-mentioned battery electrode alignment method is shown.

[0192] like Figure 6 As shown, this scenario embodiment includes the following steps:

[0193] Step 601, start the process.

[0194] Step 602: Receive a stacking completion signal. For example, after the stacking action of the current battery electrode at the stacking station is completed, the host computer can receive a stacking completion signal sent by the PLC.

[0195] Step 603: The depth camera servo moves and captures an image. For example, the PLC can control the depth camera servo to move along the length or width of the battery electrode, while the host computer controls the depth camera to start capturing images of the side features of the battery electrode to obtain an image of the battery electrode.

[0196] Step 604: Extract 3D point cloud data and analyze the alignment of the battery electrode. For example, after the image is taken, 3D point cloud image data can be extracted from the image of the battery electrode. Based on the 3D point cloud image data, image processing can be used to analyze the overall misalignment of the battery electrode and the tilt of the battery electrode, thereby determining the alignment test result of the battery electrode.

[0197] Step 605 , determining whether the alignment test result of the battery electrode is qualified, if so, executing step 606 , if not, executing step 608 .

[0198] In step 606, the host computer sends the qualified information to the PLC so that the PLC can perform subsequent operations on the qualified battery electrodes, thereby manufacturing batteries with a higher yield rate.

[0199] Step 607, end the process.

[0200] Step 608: The host computer sends the unqualified information to the PLC.

[0201] Step 609: PLC controls the corresponding mechanism to execute battery electrode waste discharge.

[0202] In this scenario embodiment, a depth camera can be used to capture images of the battery poles after lamination, and the overall alignment of the battery poles can be determined based on the 3D point cloud image data extracted from the image. Battery poles that pass the inspection can be used for subsequent manufacturing processes, and battery poles that fail the inspection can be disposed of, thereby ensuring the quality of the battery and improving the battery yield.

[0203] Based on the battery pole piece alignment detection method provided in the above embodiment, the present application also provides an embodiment of a battery pole piece alignment detection device.

[0204] Figure 7 A structural schematic diagram of a battery electrode alignment detection device provided in another embodiment of the present application is shown. For ease of explanation, only the parts related to the embodiment of the present application are shown.

[0205] Reference Figure 7 , the battery electrode alignment detection device 700 may include:

[0206] An acquisition module 701 is used to acquire a depth distance of a target cross section of a battery electrode after lamination, where the target cross section is perpendicular to a direction in which the electrode is arranged. The depth distance of the target cross section includes a depth distance corresponding to each electrode.

[0207] The detection module 702 is used to determine the alignment detection result of the battery electrode according to the depth distance of the target cross section.

[0208] In this embodiment, the battery electrode alignment detection device can obtain the depth distance of the target cross-section of the battery electrode after the battery electrode stack is formed. Since the target cross-section is perpendicular to the electrode setting direction of the battery electrode, the target cross-section includes each electrode of the battery electrode. The depth distance of the target cross-section can include the depth distance corresponding to each electrode. The overall alignment of the battery electrode after stacking can be determined through the depth distance corresponding to each electrode. The battery electrode that passes the inspection can execute the subsequent manufacturing process, and the battery electrode that fails the inspection can be discharged for waste treatment, thereby ensuring the quality of the battery and improving the battery yield.

[0209] In some embodiments, the detection module 702 may include:

[0210] A first determining unit is configured to determine, based on depth distances of the N marking points included in the target cross section, peak points and trough points among the N marking points, to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to the N pole pieces, N is an integer greater than 1, and P and Q are both positive integers;

[0211] The second determining unit is used to determine the alignment detection result of the battery electrode according to the position information of the P peak points and the Q trough points.

[0212] In this embodiment, the peak points and trough points in the battery pole piece can be determined by the depth distance of N marking points, and then the arrangement and setting of each pole piece in the battery pole piece can be more intuitively reflected based on the position information of the peak points and trough points, thereby determining the alignment detection result of the battery pole piece more quickly and accurately.

[0213] In some embodiments, the first determining unit may further be configured to:

[0214] Divide the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to the positive electrode sheet and at least one marking point corresponding to the negative electrode sheet;

[0215] According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

[0216] In this embodiment, the target cross section is divided into M regions, and then the peak points and trough points in each region are first determined. The peak points and trough points in the M regions are then summarized to obtain P peak points and Q trough points of the battery electrode. On the one hand, regional division can reduce the number of marking points in each region, effectively reducing the difficulty of determining the peak points and trough points, thereby improving the efficiency of determining the peak points and trough points in the battery electrode. On the other hand, regional division can reduce the influence of the tilt of the battery electrode on the determination of the peak points and trough points, and can more accurately determine the peak points and trough points from the N marking points of the target cross section, thereby ensuring the accuracy of the subsequent battery electrode alignment test results.

[0217] In some embodiments, the battery electrode alignment detection device 700 may further include:

[0218] A determination module is used to determine, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet a preset depth condition;

[0219] The second determining unit is further configured to determine the alignment detection result of the battery electrode according to the position information of the target peak point and the target trough point.

[0220] In this embodiment, the abnormal points among the P peak points and Q trough points can be filtered out first, and the alignment detection results of the battery pole pieces can be determined based on the position information of the filtered target peak points and target trough points, which can further improve the accuracy of the alignment detection results of the battery pole pieces.

[0221] In some embodiments, the determination module may also be configured to:

[0222] Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval;

[0223] A target trough point among the Q trough points is determined, where the depth distance of the target trough point is in a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

[0224] In this embodiment, abnormal peak points among P peak points and abnormal trough points among Q trough points can be filtered out separately, thereby ensuring the accuracy of filtering abnormal points and obtaining more accurate target peak points and target trough points, so that the accuracy can be further improved when the alignment detection results of the battery pole pieces are subsequently determined according to the position information of the target peak points and the target trough points.

[0225] In some embodiments, the second determining unit may include:

[0226] A first determining subunit is configured to determine whether the P peak points and the Q trough points are arranged according to a preset rule based on position information of the P peak points and the Q trough points;

[0227] The second determining subunit is used to determine that the alignment test result of the battery electrode is qualified when the P peak points and the Q trough points are arranged according to a preset rule.

[0228] In this embodiment, the alignment detection result of the battery electrode can be determined more intuitively and quickly based on whether the P peak points and Q trough points are arranged according to preset rules, thereby effectively improving the efficiency of alignment detection while ensuring accuracy.

[0229] In some embodiments, the second determining subunit may further be configured to:

[0230] When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to the depth distances of the P peak points and the depth distances of the Q trough points;

[0231] When the P peak points and the Q trough points meet the preset misalignment conditions, the alignment test result of the battery electrode is determined to be qualified.

[0232] In this embodiment, the alignment detection results of the battery electrodes can be determined from two dimensions. One is to consider the safety performance of the battery electrodes and judge whether the positive electrode completely covers the negative electrode. The other is to consider the electrical performance of the battery electrodes based on the neatness of the positive electrode and the negative electrode, which further improves the accuracy of the alignment detection results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0233] In some embodiments, the second determining subunit may further be configured to:

[0234] When P peak points and Q trough points are arranged according to a preset rule, the misalignment of the depth distance between the marked point corresponding to the i-th electrode piece of the battery electrode and the marked point corresponding to the i+1-th electrode piece is obtained, where i is a positive integer;

[0235] When the misalignment amounts are all within the preset misalignment amount range, it is determined that the P peak points and the Q trough points meet the preset misalignment conditions.

[0236] In this embodiment, by respectively judging whether the misalignment of the depth distance between the marking point corresponding to the i-th electrode and the marking point corresponding to the i+1-th electrode of the battery electrode are both within the preset misalignment range, and then determining whether the P peak points and Q trough points meet the preset misalignment conditions, the neatness factor of the positive electrode and the negative electrode can be more fully considered, and the accuracy of the alignment detection results is further improved, so that the subsequent battery yield based on qualified battery electrodes is higher.

[0237] In some embodiments, the battery electrode alignment detection device 700 may further include:

[0238] A fitting module is used to fit the peak line according to the position information of P peak points;

[0239] A calculation module is used to calculate the inclination of the battery electrode according to the crest straight line;

[0240] The second determining subunit may also be used to:

[0241] When the tilt amount is less than or equal to a preset threshold value, and the P peak points and Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

[0242] In this embodiment, the alignment test results of the battery electrodes can be determined from two dimensions: the overall inclination of the battery electrodes and whether the positive electrode completely covers the negative electrode. This can further improve the accuracy of the alignment test results, thereby making the subsequent battery manufacturing based on qualified battery electrodes have a higher yield rate.

[0243] In some embodiments, the acquisition module may also be used to:

[0244] When receiving the information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, the first direction being parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged;

[0245] According to the image, the depth distance of the target cross section of the battery electrode is determined.

[0246] In this embodiment, upon receiving information that the battery electrode sheets have been stacked, the camera can be controlled to capture an image of the battery electrode sheets, thereby obtaining the depth distance of the target cross-section of the battery electrode sheets. This allows for automated alignment testing of the battery electrode sheets after stacking, simplifies the testing process, and effectively improves testing efficiency.

[0247] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application, and are devices corresponding to the above-mentioned battery electrode alignment detection method. All implementation methods in the above-mentioned method embodiment are applicable to the embodiments of the device. Its specific functions and the technical effects brought about can be found in the method embodiment part, which will not be repeated here.

[0248] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0249] Figure 8 A schematic diagram of the hardware structure of an electronic device provided in yet another embodiment of the present application is shown.

[0250] The electronic device may include a processor 801 and a memory 802 storing programs or instructions. When the processor 801 executes the program, the steps in any of the above method embodiments are implemented.

[0251] For example, the program can be divided into one or more modules / units, one or more modules / units are stored in the memory 802 and executed by the processor 801 to complete the present application. One or more modules / units can be a series of program instruction segments that can perform specific functions, and the instruction segments are used to describe the execution process of the program in the device.

[0252] Specifically, the processor 801 may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0253] The memory 802 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 802 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 802 may include removable or non-removable (or fixed) media. Where appropriate, the memory 802 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 802 is a non-volatile solid-state memory.

[0254] The memory may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical or other physical / tangible memory storage devices. Thus, generally, the memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0255] The processor 801 implements any one of the methods in the above embodiments by reading and executing the program or instructions stored in the memory 802 .

[0256] In one example, the electronic device may further include a communication interface 803 and a bus 804. The processor 801, the memory 802, and the communication interface 803 are connected via the bus 804 and communicate with each other.

[0257] The communication interface 803 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0258] Bus 804 includes hardware, software or both, and the parts of online data flow metering equipment are coupled to each other. For example, but not limitation, bus can include accelerated graphics port (AGP) or other graphics bus, enhanced industry standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industry standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 804 can include one or more buses. Although the present application embodiment describes and shows specific bus, the application considers any suitable bus or interconnection.

[0259] In addition, in conjunction with the methods in the above embodiments, embodiments of the present application may be implemented by providing a readable storage medium. The readable storage medium stores a program or instructions; when the program or instructions are executed by a processor, any of the methods in the above embodiments is implemented. The readable storage medium can be read by a machine such as a computer.

[0260] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0261] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0262] An embodiment of the present application provides a computer program product, which is stored in a readable storage medium. The program product is executed by at least one processor to implement the various processes of the above-mentioned method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0263] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0264] The functional modules shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in unit, a function card or the like. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, or the like. The code segment can be downloaded via a computer grid such as the Internet, an intranet, or the like.

[0265] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0266] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by a computer program or instruction. These programs or instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagram and / or flowchart and the combination of the boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0267] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A method for detecting alignment of battery electrodes, comprising: Acquire, by means of a sensor, a depth distance of a target cross-section of a battery electrode sheet after lamination, wherein the target cross-section is perpendicular to a direction in which the electrode sheets of the battery electrode sheet are arranged, and the depth distance of the target cross-section includes the distance between each electrode sheet at the target cross-section and the sensor; Determining the alignment test result of the battery electrode sheet according to the depth distance of the target cross section; Wherein, determining the alignment detection result of the battery electrode according to the depth distance of the target cross section includes: According to the depth distances of N marking points included in the target cross section, the peak points and the trough points among the N marking points are determined to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to N pole pieces, N is an integer greater than 1, and P and Q are both positive integers; The alignment detection result of the battery electrode is determined based on the position information of the P peak points and the Q trough points.

2. The method according to claim 1, wherein The step of determining the peak points and the trough points among the N marking points according to the depth distances of the N marking points included in the target cross section to obtain P peak points and Q trough points includes: Dividing the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to a positive electrode sheet and at least one marking point corresponding to a negative electrode sheet; According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

3. The method according to claim 1, wherein After determining the peak points and trough points among the N marking points according to the depth distances of the N marking points included in the target cross section to obtain P peak points and Q trough points, the method further includes: Determine, among the P peak points and Q trough points, a target peak point and a target trough point whose depth distances meet a preset depth condition; The step of determining the alignment test result of the battery electrode sheet according to the position information of the P peak points and the Q trough points includes: The alignment detection result of the battery electrode is determined according to the position information of the target peak point and the target trough point.

4. The method according to claim 3, wherein: Determining, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet preset depth conditions includes: Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval; A target valley point among the Q valley points is determined, where a depth distance of the target valley point is within a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

5. The method according to claim 1, wherein The step of determining the alignment test result of the battery electrode sheet according to the position information of the P peak points and the Q trough points includes: Determining, based on position information of the P peak points and the Q trough points, whether the P peak points and the Q trough points are arranged according to a preset rule; When the P peak points and the Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

6. The method according to claim 5, wherein: When the P peak points and the Q trough points are arranged according to a preset rule, determining that the alignment test result of the battery electrode sheet is qualified includes: When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to a depth distance between the P peak points and a depth distance between the Q trough points; When the P peak points and the Q trough points meet a preset misalignment condition, it is determined that the alignment test result of the battery electrode sheet is qualified.

7. The method according to claim 6, wherein: The determining, when the P peak points and the Q trough points are arranged according to a preset rule, whether the P peak points and the Q trough points meet a preset misalignment condition according to a depth distance between the P peak points and a depth distance between the Q trough points includes: When the P peak points and the Q trough points are arranged according to a preset rule, obtaining the misalignment of the depth distance between the marking point corresponding to the i-th electrode piece and the marking point corresponding to the i+1-th electrode piece of the battery electrode piece, where i is a positive integer; In a case where the misalignment amounts are all within a preset misalignment amount range, it is determined that the P peak points and the Q trough points meet a preset misalignment condition.

8. The method according to claim 5, wherein Before determining the alignment detection result of the battery electrode sheet according to the position information of the P peak points and the Q trough points, the method further includes: According to the position information of the P peak points, a peak straight line is obtained by fitting; Calculating the inclination of the battery electrode according to the crest straight line; When the P peak points and the Q trough points are arranged according to a preset rule, determining that the alignment test result of the battery electrode sheet is qualified includes: When the tilt amount is less than or equal to a preset threshold value, and the P peak points and the Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

9. The method according to claim 1, wherein The step of obtaining the depth distance of the target cross section of the battery electrode sheet after lamination includes: When receiving information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, wherein the first direction is parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged; The depth distance of the target cross section of the battery electrode is determined according to the image.

10. A battery electrode alignment detection device, comprising: an acquisition module, configured to acquire, through a sensor, a depth distance of a target cross-section of the battery electrode sheet after lamination, the target cross-section being perpendicular to a direction in which the electrode sheets of the battery electrode sheet are arranged, and the depth distance of the target cross-section includes the distance between each electrode sheet at the target cross-section and the sensor; A detection module, configured to determine an alignment detection result of the battery electrode sheet according to a depth distance of the target cross section; Wherein, the detection module includes: a first determining unit, configured to determine, based on depth distances of the N marking points included in the target cross section, peak points and trough points among the N marking points, to obtain P peak points and Q trough points, wherein the N marking points correspond one-to-one to N pole pieces, N is an integer greater than 1, and P and Q are both positive integers; The second determining unit is used to determine the alignment detection result of the battery electrode according to the position information of the P peak points and the Q trough points.

11. The device according to claim 10, wherein The first determining unit is further configured to: Dividing the target cross section into M regions, wherein each of the M regions includes at least one marking point corresponding to a positive electrode sheet and at least one marking point corresponding to a negative electrode sheet; According to the depth distance of the marking point in each of the M areas, the peak point and the trough point in each of the M areas are determined to obtain P peak points and Q trough points.

12. The apparatus according to claim 10, further comprising: A determination module, configured to determine, among the P peak points and Q trough points, target peak points and target trough points whose depth distances meet a preset depth condition; The second determining unit is further configured to determine an alignment detection result of the battery electrode according to position information of the target peak point and the target trough point.

13. The device according to claim 12, wherein The determining module is further configured to: Determine a target peak point among the P peak points, where the depth distance of the target peak point is within a first depth distance interval; A target valley point among the Q valley points is determined, where a depth distance of the target valley point is within a second depth distance interval, and a minimum value of the second depth distance interval is greater than a maximum value of the first depth distance interval.

14. The device according to claim 10, wherein The second determining unit includes: A first determining subunit is configured to determine whether the P peak points and the Q trough points are arranged according to a preset rule based on position information of the P peak points and the Q trough points; The second determining subunit is configured to determine that a detection result of the alignment of the battery electrode is qualified when the P peak points and the Q trough points are arranged according to a preset rule.

15. The device according to claim 14, wherein The second determining subunit is further configured to: When the P peak points and the Q trough points are arranged according to a preset rule, determining whether the P peak points and the Q trough points meet a preset misalignment condition according to a depth distance between the P peak points and a depth distance between the Q trough points; When the P peak points and the Q trough points meet a preset misalignment condition, it is determined that the alignment test result of the battery electrode sheet is qualified.

16. The device according to claim 15, wherein The second determining subunit is further configured to: When the P peak points and the Q trough points are arranged according to a preset rule, obtaining the misalignment of the depth distance between the marking point corresponding to the i-th electrode piece and the marking point corresponding to the i+1-th electrode piece of the battery electrode piece, where i is a positive integer; In a case where the misalignment amounts are all within a preset misalignment amount range, it is determined that the P peak points and the Q trough points meet a preset misalignment condition.

17. The apparatus according to claim 14, further comprising: A fitting module, configured to obtain a peak straight line by fitting according to the position information of the P peak points; A calculation module, configured to calculate the inclination of the battery electrode according to the crest straight line; The second determining subunit is further configured to: When the tilt amount is less than or equal to a preset threshold value, and the P peak points and the Q trough points are arranged according to a preset rule, it is determined that the alignment test result of the battery electrode sheet is qualified.

18. The device according to claim 10, wherein The acquisition module is further configured to: When receiving information that the lamination of the battery electrode sheets is completed, controlling the photographing device to move along a first direction and photographing an image of the battery electrode sheets, wherein the first direction is parallel to a direction in which the electrode sheets of the battery electrode sheets are arranged; The depth distance of the target cross section of the battery electrode is determined according to the image.

19. An electronic device, characterized in that: The device includes: a processor and a memory storing programs or instructions; When the processor executes the program or instruction, the method according to any one of claims 1 to 9 is implemented.

20. A readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

21. A computer program product, characterized in that When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device is caused to perform the method according to any one of claims 1 to 9.

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