A method, system, device and storage medium for detecting the alignment of pole piece winding

Abstract

The present invention discloses a method, system, device and storage medium for detecting the alignment of pole piece winding, wherein the detection method comprises: irradiating the diaphragm surface of the winding body on the winding needle with a light source in response to an acquisition signal, and photographing the diaphragm surface after the light source irradiation and the pole piece surface not wound on the winding needle to obtain a detection image; performing boundary recognition on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body, and performing edge comparison to output the alignment detection result. The present invention uses a camera to detect the alignment between the diaphragm and the pole piece, reduces the detection cost and difficulty, and improves the accuracy of alignment detection.

Description

Technical Field

[0001] The present invention relates to the field of battery preparation, and in particular to a method, system, device and storage medium for detecting the winding alignment of a pole piece. Background Art

[0002] At present, in the production process of wound batteries, the electrode sheets cut by laser need to be rolled into a core-shaped roll by the rotation of a winding needle. The normal wrapping method is diaphragm, positive electrode, diaphragm, negative electrode, so that the diaphragm and electrode sheets are wound together to form a wound body; among them, the diaphragm plays the role of separating the positive and negative electrodes, preventing internal short circuits in the battery, allowing electrolyte ions to pass freely, and completing the electrochemical charge and discharge process.

[0003] Since the diaphragm and the electrode are stacked on top of each other, the outermost diaphragm will block the electrode. Therefore, it is impossible to detect the alignment between the electrode and the diaphragm by photographing the wound body with an ordinary camera. If the diaphragm or the electrode is offset during the winding process, it will seriously affect the production quality of the battery. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, one of the objects of the present invention is to provide a method for detecting the winding alignment of a pole piece, which uses a camera to detect the alignment between the diaphragm and the pole piece, thereby reducing the detection cost and difficulty and improving the accuracy of alignment detection.

[0005] A second object of the present invention is to provide a pole piece winding alignment detection system.

[0006] A third object of the present invention is to provide an electronic device.

[0007] A fourth object of the present invention is to provide a computer-readable storage medium.

[0008] One of the purposes of the present invention is achieved by the following technical solution:

[0009] A method for detecting the alignment of pole piece windings, comprising:

[0010] In response to the acquisition signal, a light source is used to illuminate the diaphragm surface of the winding body on the winding needle, and the diaphragm surface illuminated by the light source and the surface of the pole piece not wound onto the winding needle are photographed to obtain a detection image;

[0011] Boundary recognition is performed on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body, and edge comparison is performed to output an alignment detection result.

[0012] Furthermore, the wound body is formed by stacking a first diaphragm, a first pole piece, a second diaphragm and a second pole piece in sequence and winding them on a winding needle, the diaphragm surface of the wound body is the first diaphragm, and the inner surface of the pole piece of the wound body is the second pole piece.

[0013] Furthermore, the light source for irradiating the membrane surface of the wound body is white light, and the white light source irradiates the membrane surface so that the first membrane in the detection image is transparent and the first pole piece is presented.

[0014] Furthermore, a camera is used to simultaneously photograph the edge position of the wound body that has been wound onto the winding needle and the edge of the stack that has not been wound onto the winding needle, and the detection image is gray-scaled to extract the edge lines of the first diaphragm, the first pole piece after light transmission, the second diaphragm, and the second pole piece to complete boundary recognition.

[0015] Furthermore, the edge comparison includes edge comparison between the first pole piece and the second pole piece, and edge comparison detection between the pole piece and the diaphragm.

[0016] Furthermore, during the edge comparison process, the edge comparison result is compared with a preset error range, and if the edge comparison result exceeds the preset error range, an abnormal reminder is output.

[0017] Furthermore, when it is detected that the edge comparison result exceeds the preset error range, a correction instruction is generated according to the difference between the two to implement correction closed-loop control.

[0018] The second object of the present invention is achieved by adopting the following technical solution:

[0019] A pole piece winding alignment detection system is provided, which performs the pole piece winding alignment detection method as described above; the system comprises:

[0020] A light source irradiation module is used to irradiate the diaphragm surface of the winding body on the winding needle with a light source;

[0021] A shooting module, used for shooting the surface of the diaphragm after being irradiated by the light source and the surface of the pole piece not wound onto the winding needle to obtain a detection image;

[0022] The detection module is used to perform boundary recognition on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body, and perform edge comparison to output an alignment detection result.

[0023] The third object of the present invention is achieved by adopting the following technical solution:

[0024] An electronic device comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned pole piece winding alignment detection method when executing the computer program.

[0025] The fourth object of the present invention is achieved by adopting the following technical solution:

[0026] A computer-readable storage medium stores a computer program, which implements the above-mentioned pole piece winding alignment detection method when executed.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention irradiates the surface of the diaphragm of the wound body through a designated light source, so that the diaphragm is transparent and the pole piece under the diaphragm is visible. During the winding process, the front and back sides of the wound body are photographed simultaneously, that is, the diaphragm and the pole piece visible after the diaphragm is transparent can be photographed from the front side of the wound body, and the other pole piece and the other diaphragm can be photographed from the back side of the wound body. The boundary relationship between the diaphragm and the pole piece can be photographed by an ordinary camera to perform alignment detection, replacing the traditional method of X-ray irradiation, thereby improving the accuracy of alignment detection while reducing the detection cost and detection difficulty. The alignment detection operation can also be completed in real time during the winding process to improve the quality and efficiency of battery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic flow chart of a method for detecting the winding alignment of a pole piece according to the present invention;

[0030] Figure 2 This is a schematic diagram of the battery winding process of the present invention;

[0031] Figure 3 It is a front view of the winding process of the present invention;

[0032] Figure 4 This is a schematic diagram of a detection image captured by the present invention.

[0033] In the figure: Figure 1 , winding needle; 2, lamination; 201, first diaphragm; 202, first pole piece; 203, second diaphragm; 204, fourth diaphragm; 3, winding body. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0035] Embodiment 1

[0036] This embodiment provides a method for detecting the alignment of pole pieces during winding, which is used to detect the alignment between pole pieces and between pole pieces and separators during the winding process to meet the requirements of battery quality detection.

[0037] refer to Figure 1 As shown, the detection method specifically comprises the following steps:

[0038] Step S1: in response to the acquisition signal, a light source is used to illuminate the surface of the diaphragm of the winding body 3 on the winding needle 1, and the surface of the diaphragm after the light source illumination and the surface of the pole piece not wound onto the winding needle 1 are photographed to obtain a detection image;

[0039] The winding body 3 of this embodiment is formed by winding a laminate 2, and the laminate 2 at least includes a first diaphragm 201, a first pole piece 202, a second diaphragm 203 and a second pole piece 204 stacked in sequence. Figure 2 As shown, during the rotation of the winding needle 1, the multilayer structure is wound together to form a winding body 3. The first pole piece 202 can be a positive pole piece, and the second pole piece 204 is equivalent to a negative pole piece. The stacking order and quantity of the positive and negative pole pieces can be adjusted according to actual needs, but it is ensured that there is a diaphragm between the pole pieces.

[0040] In this embodiment, a surface array camera is used to shoot the winding body 3 on the winding needle 1. Figure 3 As shown, Figure 3 The area indicated by A is the camera shooting area; at the same time, it is ensured that during the shooting process, the area array camera can simultaneously capture the edge image of the winding body 3 that has been wound onto the winding needle 1 and the edge image of the laminate 2 that has not been wound onto the winding needle 1; this is equivalent to using one area array camera to capture the front side of the laminate 2 on the winding needle 1, that is, the first diaphragm 201, and at the same time, the area array camera can also capture the back side of the laminate 2, that is, the second pole piece 204.

[0041] Since the first diaphragm 201 blocks the first pole piece 202, in order to determine the edge position of the first pole piece 202, it is necessary to irradiate the diaphragm surface of the winding body 3 on the winding needle 1, that is, to irradiate the first diaphragm 201. After irradiation, the first diaphragm 201 can transmit light and show the first pole piece 202 underneath, so that the area array camera can collect the image of the first pole piece 202.

[0042] In this embodiment, the first diaphragm 201 is white, so the first diaphragm 201 wound on the winding needle 1 is illuminated by strong white light, so that the first pole piece 202 under the first diaphragm 201 can be transparent. In order to clearly distinguish the pole piece and the diaphragm edge, the color used on the winding needle 1 needs to have a certain contrast difference with the white diaphragm.

[0043] The area array camera mainly takes pictures of the edge position of the winding body 3, and the obtained detection image can simultaneously capture the first diaphragm 201, the first pole piece 202 after light transmission, the second diaphragm 203 and the second pole piece 204. Afterwards, the detection image needs to be gray-scale processed to extract the edge lines of the first diaphragm 201, the first pole piece 202, the second diaphragm 203 and the second pole piece 204.

[0044] Under normal circumstances, the diaphragm needs to completely cover the electrode, that is, the size of the diaphragm needs to be larger than the size of the electrode; in this embodiment, Figure 4 As shown, after the front side of the laminate 2 wound onto the winding needle 1 is irradiated with strong white light, the area corresponding to the first diaphragm 201 appears white, and the first pole piece 202 that is revealed after light transmission appears gray under the cover of the first diaphragm 201; the back side of the laminate 2 that is not wound onto the winding needle 1 is the second pole piece 204, which appears black after being photographed by a camera and grayscale processing, and the position of the second diaphragm 203 that is not blocked by the second pole piece 204 appears white.

[0045] Step S2: performing boundary recognition on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body 3, and performing edge comparison to output an alignment detection result.

[0046] After grayscale processing and noise removal of the detection image, the edge lines of the first diaphragm 201, the first pole piece 202 after light transmission, the second diaphragm 203, and the second pole piece 204 can be extracted to complete boundary recognition. Afterwards, the extracted edge lines of the diaphragm and the pole piece need to be edge-matched, and the edge comparison includes edge comparison between the first pole piece 202 and the second pole piece 204, and edge comparison detection between the pole piece and the diaphragm.

[0047] In this embodiment, the detection content specifically includes:

[0048] a. Alignment detection between positive and negative electrodes and the edge of the diaphragm in the same circle;

[0049] b. Alignment detection between the positive electrode and the upper negative electrode;

[0050] c. Alignment detection between the positive electrode and the upper separator;

[0051] d. Alignment detection between the negative electrode and the underlying separator.

[0052] This embodiment can calculate the edge line distance between the pole pieces and the edge line distance between the pole pieces and the diaphragm, and then compare the calculated distance value with the preset error range. If the distance value is within the preset error range, it means that the alignment between the pole pieces and the pole pieces is normal, and the alignment between the pole pieces and the diaphragm is normal; if the distance value is not within the preset error range, the output detection result is abnormal.

[0053] In some embodiments, if the detection result is abnormal, a correction instruction can be generated based on the alignment detection deviation to control the correction equipment to adjust the position of the pole piece and diaphragm during the winding process, thereby realizing correction closed-loop control.

[0054] Embodiment 2

[0055] This embodiment provides a pole piece winding alignment detection system, which executes the pole piece winding alignment detection method as described in the first embodiment, and can detect the alignment of the pole piece and the diaphragm during the winding process.

[0056] The system specifically includes a light source irradiation module, a shooting module and a detection module.

[0057] The light source illumination module is used to illuminate the surface of the diaphragm of the winding body 3 on the winding needle 1; wherein the light source illumination adopts strong white light, so that the surface of the diaphragm can be transparent and the pole piece under the diaphragm can be revealed.

[0058] The shooting module is used to shoot the surface of the diaphragm after being irradiated by the light source and the surface of the pole piece not wound onto the winding needle 1 to obtain a detection image, so that the detection image can simultaneously capture the first diaphragm 201, the first pole piece 202 after light transmission, the second diaphragm 203 and the second pole piece 204.

[0059] The detection module is used to perform boundary recognition on the detection image, and its boundary recognition includes grayscale processing and noise removal. Its boundary recognition method has been disclosed in the prior art, and its working principle is not described in detail here. The detection module obtains the boundary position between each pole piece and each diaphragm in the winding body 3 through boundary recognition, and performs edge comparison to output the alignment detection result.

[0060] In addition, the system may also include a correction module, which is used to correct the pole pieces and diaphragms in the winding process according to the alignment detection deviation when the alignment detection result is abnormal, and to perform real-time detection of the alignment between the pole pieces and the pole pieces, and the pole pieces and the diaphragms during the correction process, so as to ensure that the alignment between the pole pieces and the pole pieces, and the pole pieces and the diaphragms is maintained at a normal level, thereby improving the battery production quality.

[0061] Embodiment 3

[0062] This embodiment provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the pole piece winding alignment detection method in the first embodiment is implemented; in addition, this embodiment also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the above-mentioned pole piece winding alignment detection method is implemented.

[0063] The device and storage medium in this embodiment and the method in the aforementioned embodiment are two aspects based on the same inventive concept. The method implementation process has been described in detail above, so those skilled in the art can clearly understand the structure and implementation process of the device and storage medium in this embodiment based on the aforementioned description. For the sake of brevity of the specification, they will not be repeated here.

[0064] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for detecting the alignment of pole piece winding, characterized in that: include: In response to the acquisition signal, a light source is used to illuminate the surface of the diaphragm of the winding body on the winding needle, and the surface of the diaphragm after the light source is illuminated and the surface of the pole piece not wound onto the winding needle are photographed to obtain a detection image; boundary recognition is performed on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body, and edge comparison is performed to output an alignment detection result; The winding body is formed by stacking a first diaphragm, a first pole piece, a second diaphragm and a second pole piece in sequence and winding them on a winding needle, the diaphragm surface of the winding body is the first diaphragm, and the pole piece surface is the second pole piece; The light source for irradiating the membrane surface of the wound body is white light, and the white light source irradiates the membrane surface so that the first membrane in the detection image is transparent and the first pole piece is presented; A camera is used to simultaneously photograph the edge position of the wound body that has been wound onto the winding needle and the edge of the stack that has not been wound onto the winding needle, and the detection image is gray-scaled to extract the edge lines of the first diaphragm, the first pole piece after light transmission, the second diaphragm, and the second pole piece to complete boundary recognition.

2. The pole piece winding alignment detection method according to claim 1, characterized in that: The edge comparison includes edge comparison between pole pieces and edge comparison detection between pole pieces and diaphragms.

3. The pole piece winding alignment detection method according to claim 2, characterized in that: During the edge comparison process, the edge comparison result is compared with a preset error range. If the edge comparison result exceeds the preset error range, an abnormality reminder is output.

4. The pole piece winding alignment detection method according to claim 3, characterized in that: When it is detected that the edge comparison result exceeds the preset error range, a correction instruction is generated according to the difference between the two to implement correction closed-loop control.

5. A pole piece winding alignment detection system, characterized in that: Execute the pole piece winding alignment detection method as described in any one of claims 1 to 4; the system comprises: a light source irradiation module, used to irradiate the diaphragm surface of the winding body on the winding needle with a light source; a shooting module, used to shoot the diaphragm surface after the light source irradiation and the pole piece surface not wound onto the winding needle to obtain a detection image; a detection module, used to perform boundary recognition on the detection image to obtain the boundary position between each pole piece and each diaphragm in the winding body, and perform edge comparison to output the alignment detection result.

6. An electronic device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for detecting the winding alignment of the pole piece according to any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method for detecting the pole piece winding alignment degree according to any one of claims 1 to 4 is implemented.

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