A Multi-Pole Ear Battery Core Coverage Detection Method and Device

Abstract

The present invention belongs to the technical field of battery detection, and particularly relates to a multi-tab cell coverage detection method, which includes selecting a pole piece with a paste and an insulating layer coated on the surface of the pole piece body in sequence. The paste and the insulating layer are coated on both the front and back sides of the pole piece. The widths of the insulating layers on both the front and back sides of the pole piece are detected. Combining the coverage test data, it is judged and confirmed whether the winding coverage in the cell is qualified through a judgment logic. The present invention can effectively monitor the situation of incomplete coverage due to the misalignment of the paste on the pole piece, and avoid a large safety risk of the battery. In addition, the present invention also provides a multi-tab cell coverage detection device.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery detection, and particularly relates to a multi-tab cell coverage detection method and device. Background Art

[0002] At present, a lithium-ion cell is formed by winding cell materials, such as a positive electrode sheet, an upper separator, a negative electrode sheet, and a lower separator, into a cylindrical cell using a winding device. However, during the winding process, the positive and negative electrode sheets often have poor coverage, which poses a significant safety risk to the battery.

[0003] Moreover, during the manufacturing process of the electrode sheets of a multi-tab cell structure, the insulating layers and pastes on both sides of the electrode sheet are misaligned. However, the prior art cannot efficiently detect the coverage misalignment of the multi-tab cell. Therefore, a new technical solution is urgently needed to solve the above problems. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a multi-tab cell coverage detection method for effectively monitoring the incomplete coverage caused by paste misalignment and avoiding significant safety risks to the battery in view of the deficiencies of the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A multi-tab cell coverage detection method includes the following steps:

[0007] S1. Select an electrode sheet with a paste and an insulating layer sequentially coated on the surface of the electrode sheet body. An image collector is correspondingly arranged on one side of the electrode sheet, and a plane mirror is correspondingly arranged on the other side of the electrode sheet. The plane mirror is arranged non-parallel to the electrode sheet. Both the front and back sides of the electrode sheet are coated with the paste and the insulating layer;

[0008] S2. Obtain the width of the insulating layer corresponding to the image collector through the image collector, and calculate the width of the insulating layer corresponding to the plane mirror by means of plane mirror imaging;

[0009] S3. Construct a determination logic by combining coverage test data, compare the widths of the insulating layers on the front and back sides of the electrode sheet through the determination logic, and determine and confirm whether the winding coverage in the cell is qualified from the misalignment situation of the paste on the front and back sides of the electrode sheet.

[0010] As an improvement of the detection method of the present invention, the following steps are further included in S2: determining the value of the angle between the plane mirror and the pole piece as α, such that α satisfies the relationship: 0° < α < 45°, obtaining the orthographic projection length L of the insulating layer corresponding to the plane mirror, and obtaining the value of the width L1 of the insulating layer corresponding to the plane mirror by using the formula L1 = L / sin(90° - 2α).

[0011] As an improvement of the detection method of the present invention, the following steps are further included in S2: making the value of the angle between the acquisition plane of the image acquisition device and the plane mirror equal to α, and obtaining the orthographic projection length L of the insulating layer corresponding to the plane mirror on the acquisition plane through the image acquisition device.

[0012] As an improvement of the detection method of the present invention, the following steps are further included in S1: the selected pole piece is a cathode piece, the paste and the insulating layer cover the pole piece body in sequence from the length direction of the pole piece body, and the insulating layer is located on the tab side of the pole piece body.

[0013] As an improvement of the detection method of the present invention, the construction of the determination logic in S3 includes: making the insulating layer corresponding to the image acquisition device be the A-side insulating layer, making the insulating layer corresponding to the plane mirror be the B-side insulating layer, and if the width L A of the A-side insulating layer and the width L B of the B-side insulating layer satisfy the relationship: L B ≥ L A , then it is determined and confirmed that the winding coverage in the battery cell is qualified.

[0014] As an improvement of the detection method of the present invention, the construction of the determination logic in S3 includes: setting the cathode and anode coverage margin as X and the cathode and anode coverage lower limit as Y, making the width of the insulating layer corresponding to the image acquisition device be L A , making the width of the insulating layer corresponding to the plane mirror be L B , when L B < L A and X - |L A - L B | ≥ Y, then it is determined and confirmed that the winding coverage in the battery cell is qualified.

[0015] As an improvement of the detection method of the present invention, the following steps are further included in S3: equally dividing multiple segments on both the front and back sides of the pole piece, recording the dislocation situation of the paste in each segment of the pole piece, and determining and confirming whether the winding coverage in the battery cell is qualified.

[0016] As an improvement of the detection method of the present invention, the step S3 further includes: swapping the positions of the image collector and the plane mirror, re-acquiring the widths of the insulating layers on the front and back sides of the pole piece, and determining and confirming whether the winding coverage in the battery cell is qualified again from the misalignment conditions of the pastes on the front and back sides of the pole piece.

[0017] The second object of the present invention is to provide a multi-tab battery cell coverage detection device, including an image collector, a plane mirror and a frame. The frame is provided with a guide shaft and a movable gear. One end of the guide shaft is connected to the movable gear, and the other end of the guide shaft is connected to the plane mirror. The image collector is arranged on the frame.

[0018] As an improvement of the detection device of the present invention, a plurality of the movable gears are meshed and rotatably arranged on the frame. Among them, the guide shaft and the movable gear are used to adjust the angle of the plane mirror. The image collector corresponds to one side of the battery cell pole piece, and the plane mirror corresponds to the other side of the battery cell pole piece. The two sides of the battery cell pole piece have insulating layers with different widths. The image collector and the plane mirror are respectively used to acquire the widths of the insulating layers corresponding to them.

[0019] As an improvement of the detection device of the present invention, the image collector is communicatively connected to a data processing system. The data processing system is used to analyze detection data and display detection results. The communication connection methods include but are not limited to electrical connection and wireless connection.

[0020] The beneficial effects of the present invention are as follows: The detection method of the present invention can effectively detect the misalignment of the insulating layers and pastes on both sides of the pole piece of the multi-tab battery cell. Moreover, through the plane mirror, efficient measurement can be achieved for the side of the pole piece that is not directly tested by the image collector. It not only solves the problem that the two-sided dimensions cannot be detected simultaneously when the paste is misaligned, but also can judge and confirm whether the winding coverage in the battery cell is qualified by monitoring the dimensional relationship between the paste and the insulating layer and combining the judgment logic, so as to efficiently detect the battery cells that do not meet the safety requirements. Description of the Drawings

[0021] Figure 1 It is a flowchart of the detection method of the present invention.

[0022] Figure 2 It is a schematic structural diagram of a pole piece of the detection method of the present invention.

[0023] Figure 3 It is an operation schematic diagram of the detection method of the present invention.

[0024] Figure 4 It is a schematic diagram of the geometric relationship between the plane mirror and the pole piece of the detection method of the present invention.

[0025] Figure 5 This is a schematic structural diagram of the detection device of the present invention.

[0026] Wherein: 1 - pole piece; 11 - insulating layer on side A; 12 - insulating layer on side B; 13 - paste coating on side A; 14 - paste coating on side B; 15 - misalignment area; 2 - plane mirror; 3 - image collector; 4 - frame; 5 - guide shaft; 6 - movable gear; α - included angle between the plane mirror and the pole piece. Specific embodiments

[0027] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] During the manufacturing process of the cathode sheet of a multi-tab structure battery cell, an insulating layer needs to be coated on the tab side. During the production process, the insulating layers and paste coatings on both sides of the cathode sheet are misaligned. During winding, a single CCD-covered detection camera cannot monitor both sides of the cathode sheet. Therefore, the unmonitored side of the cathode sheet may have an over-coverage of the anode due to the misalignment of the paste coating, resulting in a greater safety risk for the battery cell. Therefore, this application proposes a test method for determining the coverage of a wound multi-tab battery cell, which solves the problem that the two-sided dimensions of the battery cell coverage cannot be detected simultaneously by optimizing the measurement method.

[0031] The following further elaborates on the present invention in conjunction with the attached drawings Figures 1 to 5 and specific embodiments, but it does not limit the present invention.

[0032] Embodiment 1

[0033] A method for detecting the coverage of a multi-tab cell is as follows Figures 1 to 3 shown, including the following steps:

[0034] S1. Select a pole piece 1 with a paste and an insulating layer sequentially coated on the surface of the pole piece body. An image collector 3 is correspondingly arranged on one side of the pole piece 1, and a plane mirror 2 is correspondingly arranged on the other side of the pole piece 1. The plane mirror 2 is arranged non-parallel to the pole piece 1, and both the front and back sides of the pole piece 1 are coated with paste and an insulating layer;

[0035] S2. Obtain the width of the insulating layer corresponding to the image collector 3, and calculate the width of the insulating layer corresponding to the plane mirror 2 by the method of plane mirror imaging;

[0036] S3. Combine the coverage test data to construct a determination logic, and compare the widths of the insulating layers on the front and back sides of the pole piece 1 through the determination logic, and judge and confirm whether the winding coverage in the cell is qualified from the misalignment situation of the paste on the front and back sides of the pole piece 1.

[0037] Among them, the detection method of the present application acts on a multi-tab cell, and the tabs of the multi-tab cell can be die-cut tabs. The detection method of the present application can detect the misalignment situation of the paste and the insulating layer on the surface of the cathode sheet before the winding process of the anode sheet, diaphragm, and cathode sheet of the multi-tab cell. Moreover, during the manufacturing process of the cathode sheet of the multi-tab cell structure, applying an insulating layer on the tab side can ensure the safe operation of the cell.

[0038] Preferably, in the detection method of the present application, in step S1, it further includes: the selected pole piece 1 is a cathode sheet, the paste and the insulating layer cover the pole piece body in sequence from the length direction of the pole piece body, the insulating layer is located on the tab side of the pole piece body, the pole piece body can be a current collector, and the pole piece 1 has multiple die-cut tabs.

[0039] After arranging the positions of the plane mirror 2 and the image collector 3 in step S1, specifically, in step S2 of the detection method of the present application, it further includes: referring to Figure 4 , determine that the value of the included angle between the plane mirror 2 and the pole piece 1 is α, and make α satisfy the relational expression: 0° < α < 45°, and obtain the orthographic projection length L of the insulating layer corresponding to the plane mirror 2, where the orthographic projection length L of the insulating layer corresponding to the plane mirror 2 is the length value of A Figure 4 in 2 B 1 First, obtain ∠A 2 B 1 A 1The value is 2α, and then in the right triangle A 2 B 1 A 1 calculate ∠A 2 A 1 B 1 The value is 90° - 2α. By using the formula L1 = L / sin(90° - 2α), the value of the width L1 of the insulating layer corresponding to the plane mirror 2 can be efficiently obtained. In other words, the method of obtaining the value of the width L1 of the insulating layer corresponding to the plane mirror 2 in step S2 is a means of obtaining the width of the insulating layer of the non-direct test surface with low cost and high efficiency.

[0040] In addition, step S2 further includes: making the included angle value between the acquisition plane of the image acquisition device 3 and the plane mirror 2 equal to α, and obtaining the orthographic projection length L of the insulating layer corresponding to the plane mirror 2 on the acquisition plane through the image acquisition device 3. In other words, when the reflection light path of the plane mirror 2 can enter the acquisition plane of the image acquisition device 3, the widths of the insulating layers on both the front and back sides of the pole piece 1 can be quickly obtained in one step.

[0041] After that, in the detection method of the present application, the process of constructing the determination logic in step S3 includes: making the insulating layer corresponding to the image acquisition device 3 be the A-side insulating layer 11, and making the insulating layer corresponding to the plane mirror 2 be the B-side insulating layer 12. If the width L A of the A-side insulating layer 11 and the width L B of the B-side insulating layer 12 satisfy the relationship: L B ≥L A , it is determined and confirmed that the winding coverage in the battery cell is qualified; otherwise, the coverage that does not meet the above relationship is confirmed as unqualified.

[0042] Moreover, in the detection method of the present application, the process of constructing the determination logic in step S3 further includes: setting the cathode and anode coverage margin as X and the cathode and anode coverage lower limit as Y, making the width of the insulating layer corresponding to the image acquisition device 3 be L A , making the width of the insulating layer corresponding to the plane mirror 2 be L B , when L B <L A and X - |L A -L B |≥Y, it is determined and confirmed that the winding coverage in the battery cell is qualified; otherwise, the coverage that does not meet the above relationship is determined and confirmed as unqualified.

[0043] In order to ensure the accuracy and precision of the coverage detection of multi-pole lug cells, in the detection method of the present application, step S3 also includes: dividing the front and back sides of the pole piece 1 into multiple equal sections, and judging and confirming whether the winding coverage in the cell is qualified by recording the misalignment of the paste in each section of the pole piece 1. In the pole piece 1, the side of the pole piece 1 facing the image collector 3 is the A side, and the A side is coated with the A side insulation layer 11 and the A side paste 13; the side of the pole piece 1 facing the plane mirror 2 is the B side, and the B side is coated with the B side insulation layer 12 and the B side paste 14. When there is a misalignment between the A side paste 13 and the B side paste 14, a misalignment area 15 will appear. If the misalignment of the paste in each section of the pole piece 1 is recorded, the misalignment area 15 will intuitively feedback the coverage of the multi-pole lug cell, thereby effectively improving the efficiency and accuracy of the detection.

[0044] Example 2

[0045] Different from Example 1, step S3 of this embodiment also includes: swapping the positions of the image collector 3 and the plane mirror 2, reacquiring the width of the insulating layer on the front and back sides of the pole piece 1, and again judging and confirming whether the winding coverage in the battery cell is qualified based on the misalignment of the paste on the front and back sides of the pole piece 1. By swapping the positions of the image collector 3 and the plane mirror 2, the coverage of the multi-electrode battery cell can be verified again, which effectively reduces the probability of errors and ensures high accuracy and precision of coverage detection.

[0046] The other steps of this embodiment are the same as those of Embodiment 1 and will not be described again here.

[0047] Example 3

[0048] A multi-electrode battery cell coverage detection device, such as Figure 5 As shown, it includes an image collector 3, a plane mirror 2 and a frame 4, the frame 4 is provided with a guide shaft 5 and a movable gear 6, one end of the guide shaft 5 is connected to the movable gear 6, and the other end of the guide shaft 5 is connected to the plane mirror 2, the image collector 3 is arranged on the frame 4, wherein the angle of the plane mirror 2 can be adjusted by turning the guide shaft 5 and the movable gear 6, and the pole piece 1 is placed between the image collector 3 and the plane mirror 2, and the multi-electrode ear battery cell coverage detection can be realized according to the method of Examples 1 to 2.

[0049] Preferably, a plurality of movable gears 6 are meshed and rotatably disposed on the frame 4 , thereby improving the stability of the angle adjustment of the plane mirror 2 .

[0050] In addition, the image acquisition device 3 itself may have a data analysis module or may be communicatively connected to a data processing system. After analyzing and processing the detection data, the detection results may be directly obtained and displayed through corresponding algorithms during detection, thereby significantly improving the detection efficiency.

[0051] Obviously, the detection method of the present invention can efficiently and accurately determine the coverage of the multi-tab structure battery cell, and can effectively solve the problem that the sizes of both sides of the cathode cannot be detected simultaneously.

[0052] According to the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments, and any obvious improvements, substitutions or variations made by those skilled in the art based on the present invention all fall within the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A method for detecting the coverage of a multi-tab battery cell, characterized in that, it includes the following steps: S1. Select a pole piece whose surface of the pole piece body is successively coated with paste and an insulating layer. The paste and the insulating layer successively cover the pole piece body along the length direction of the pole piece body. The insulating layer is located on the tab side of the pole piece body. An image collector is correspondingly arranged on one side of the pole piece, and a plane mirror is correspondingly arranged on the other side of the pole piece. The plane mirror is arranged non-parallel to the pole piece. Both the front and back sides of the pole piece are coated with the paste and the insulating layer; S2. Obtain the width of the insulating layer corresponding to the image collector through the image collector, and calculate the width of the insulating layer corresponding to the plane mirror by the method of plane mirror imaging; S3. Construct a determination logic by combining the multi-tab battery cell coverage test data, compare the widths of the insulating layers on the front and back sides of the pole piece through the determination logic, and judge and confirm whether the winding coverage in the battery cell is qualified from the misalignment situation of the paste on the front and back sides of the pole piece.

2. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, in S2, it further includes: determining that the value of the included angle between the plane mirror and the pole piece is α, and making α satisfy the relational expression: 0° < α < 45°, obtaining the orthographic projection length L of the insulating layer corresponding to the plane mirror, and using the formula L1 = L / sin(90° - 2α) to obtain the value of the width L1 of the insulating layer corresponding to the plane mirror.

3. The method for detecting the coverage of a multi-tab battery cell according to claim 2, characterized in that, in S2, it further includes: making the value of the included angle between the acquisition plane of the image collector and the plane mirror equal to α, and obtaining the orthographic projection length L of the insulating layer corresponding to the plane mirror in the acquisition plane through the image collector.

4. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, in S1, it further includes: the selected pole piece is a cathode piece.

5. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, The construction determination logic in S3 includes: making the insulating layer corresponding to the image collector the insulating layer of side A, making the insulating layer corresponding to the plane mirror the insulating layer of side B, if the width L of the insulating layer of side A A and the width L of the insulating layer of side B B satisfy the relational expression: L B ≥L A , then it is determined and confirmed that the winding coverage in the battery cell is qualified.

6. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, The construction determination logic in S3 includes: setting the cathode and anode coverage margin as X and the cathode and anode coverage lower limit as Y, and making the width of the insulating layer corresponding to the image collector be L A , and making the width of the insulating layer corresponding to the plane mirror be L B , when L B < L A and X - |L A - L B | ≥ Y, it is determined and confirmed that the winding coverage in the battery cell is qualified.

7. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, in S3, it further includes: equally dividing the front and back sides of the pole piece into multiple segments, recording the misalignment situation of the paste in each segment of the pole piece, and judging and confirming whether the winding coverage in the battery cell is qualified.

8. The method for detecting the coverage of a multi-tab battery cell according to claim 1, characterized in that, in S3, it further includes: swapping the positions of the image collector and the plane mirror, re-obtaining the widths of the insulating layers on the front and back sides of the pole piece, and again judging and confirming whether the winding coverage in the battery cell is qualified from the misalignment situation of the paste on the front and back sides of the pole piece.

9. A detection device for the method for detecting the coverage of a multi-tab battery cell according to any one of claims 1 to 8, characterized in that: It includes an image collector, a plane mirror and a frame. The frame is provided with a guide shaft and a movable gear. One end of the guide shaft is connected to the movable gear, and the other end of the guide shaft is connected to the plane mirror. The image collector is arranged on the frame, and the image collector has a data analysis module.

10. The detection device according to claim 9, characterized in that: A plurality of the movable gears are meshed and rotatably arranged on the frame.

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