Battery roll core winding method and device, electronic equipment and winding machine table

Abstract

The invention relates to the technical field of batteries, in particular to a battery roll core winding method and device, electronic equipment and a winding machine table. Obtaining a target positive plate coating area width corresponding to a positive plate of the battery roll core to be wound; obtaining a target negative plate coating area width corresponding to a negative plate of the battery roll core to be wound; calculating a target stock line position corresponding to the to-be-wound battery roll core by using the target positive plate coating area width and the target negative plate coating area width; and according to the target material line position, the winding machine body is controlled to wind the to-be-wound battery roll core, so that the winding accuracy of the to-be-wound battery roll core can be ensured. Therefore, winding production personnel do not need to frequently adjust the position of the winding material line, so that the coating reject ratio of winding the tab side and the non-tab side of the positive and negative pole pieces is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery core winding method, device, electronic equipment and a winding machine. Background Art

[0002] Secondary batteries are widely used in the fields of energy storage and power. The positive electrode, negative electrode and separator in the secondary battery are formed into a core or laminated battery cell through winding or lamination. Among them, the winding process is selected as the mainstream process route by battery manufacturers due to its high efficiency and simple process.

[0003] During the winding process, the positive electrode sheet, negative electrode sheet and separator are wound together by a winding needle to form a winding core, among which the relative position control of the negative electrode sheet coating area and the positive electrode sheet coating area is the key. The negative electrode sheet coating area must cover the positive electrode sheet coating area, even if both sides of the negative electrode sheet coating area in the width direction exceed the positive electrode sheet coating area, to ensure the safety performance of the secondary battery.

[0004] However, the existing positive electrode sheets are provided with coating areas on both sides, and a protective layer is coated on one or both sides of the coating area along the width direction, wherein the protective layer is usually a protective layer or a semiconductor layer. Although the provision of the protective layer can prevent burrs from piercing the diaphragm and causing a short circuit in the battery, the coating width of the protective layer fluctuates greatly. In addition, the total width of the electrode sheet before die separation (die cutting and slitting) and the width of the electrode sheet after die separation fluctuate, resulting in the difficulty in controlling the consistency of the width of the coating area on the front and back sides of the positive electrode sheet, which ultimately causes the winding production personnel to frequently adjust the position of the winding material line, while increasing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, thereby increasing the manufacturing cost. Summary of the invention

[0005] In view of this, the present invention provides a battery core winding method, device, electronic equipment and winding machine to solve the problem in the prior art that it is difficult to control the width consistency of the coating areas on the front and back sides of the positive electrode sheet, which ultimately requires the winding production personnel to frequently adjust the position of the winding material line, while increasing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, thereby increasing the manufacturing cost.

[0006] In a first aspect, the present invention provides a battery core winding method, the method comprising: Obtaining a target positive electrode sheet coating area width corresponding to a positive electrode sheet of a battery core to be wound, wherein the positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along a width direction; Obtaining a target negative electrode sheet coating area width corresponding to a negative electrode sheet of a battery core to be wound, wherein the negative electrode sheet includes a negative electrode coating area; Calculate the target material line position corresponding to the battery core to be wound using the target positive electrode coating area width and the target negative electrode coating area width; According to the target material line position, the winding machine body is controlled to wind the battery core to be wound.

[0007] The battery core winding method provided in the embodiment of the present application obtains the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound, and obtains the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound. Then, the target positive electrode sheet coating area width and the target negative electrode sheet coating area width are used to calculate the target material line position corresponding to the battery core to be wound, thereby ensuring the accuracy of the calculated target material line position corresponding to the battery core to be wound. Then, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound, thereby ensuring the accuracy of winding the battery core to be wound. Therefore, there is no need for the winding production personnel to frequently adjust the winding material line position, thereby reducing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, and reducing the manufacturing cost.

[0008] In an optional embodiment, there are multiple battery cores to be wound, and the positive electrode sheets of the multiple battery cores to be wound are obtained by slitting the same positive electrode sheet roll, and obtaining the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound includes: Obtaining a plurality of initial positive electrode sheet front coating area widths and a plurality of initial positive electrode sheet back coating area widths corresponding to each battery core to be wound; For each battery core to be wound, determine each maximum positive electrode sheet front coating area width from each initial positive electrode sheet front coating area width; Determine each maximum positive electrode sheet back coating area width from each initial positive electrode sheet back coating area width; Arrange the width of the coating area on the front side of each largest positive electrode sheet and the width of the coating area on the back side of each largest positive electrode sheet in descending order to generate a first queue; A statistical calculation is performed on a preset number of data in the first queue to obtain a target positive electrode sheet coating area width corresponding to each battery core to be wound.

[0009] The battery core winding method provided in the embodiment of the present application obtains multiple initial positive electrode sheet front coating area widths and multiple initial positive electrode sheet back coating area widths corresponding to each battery core to be wound. For each battery core to be wound, the maximum positive electrode sheet front coating area width is determined from each initial positive electrode sheet front coating area width; the maximum positive electrode sheet back coating area width is determined from each initial positive electrode sheet back coating area width, thereby ensuring the accuracy of the determined maximum positive electrode sheet front coating area width and the maximum positive electrode sheet back coating area width. The maximum positive electrode sheet front coating area width and the maximum positive electrode sheet back coating area width are arranged in descending order to generate a first queue, thereby ensuring the accuracy of the generated first queue. The first preset number of data in the first queue is statistically calculated to obtain the target positive electrode sheet coating area width corresponding to each battery core to be wound, thereby ensuring the accuracy of the determined target positive electrode sheet coating area width and ensuring that the error tolerance rate of the determined target positive electrode sheet coating area width is high.

[0010] In an optional embodiment, obtaining a plurality of initial positive electrode sheet front coating area widths and a plurality of initial positive electrode sheet back coating area widths corresponding to each to-be-wound battery core includes: For each battery core to be wound, the first detection camera detects the width of the positive electrode sheet front protective layer and the width of the positive electrode sheet back protective layer corresponding to multiple detection positions of the battery core to be wound; Acquire the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound based on the second detection camera; For each detection position, the width of the positive electrode sheet front protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet front coating area width corresponding to the detection position; The width of the protective layer on the back of the positive electrode sheet is subtracted from the total width of the positive electrode sheet to obtain the width of the coating area on the back of the initial positive electrode sheet corresponding to the detection position.

[0011] The battery core winding method provided in the embodiment of the present application, for each battery core to be wound, detects the positive electrode sheet front protective layer width and the positive electrode sheet back protective layer width corresponding to multiple detection positions of the battery core to be wound based on the first detection camera, thereby ensuring the accuracy of the positive electrode sheet front protective layer width and the positive electrode sheet back protective layer width corresponding to multiple detection positions of the battery core to be wound. The total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound is obtained based on the second detection camera, thereby ensuring the accuracy of the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound. For each detection position, the width of the positive electrode sheet front protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet front coating area width corresponding to the detection position, thereby ensuring the accuracy of the initial positive electrode sheet front coating area width corresponding to each detection position. The width of the positive electrode sheet back protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet back coating area width corresponding to the detection position. The accuracy of the initial positive electrode sheet back coating area width corresponding to each detection position is ensured.

[0012] In an optional embodiment, the number of battery cores to be wound is multiple, and obtaining the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound includes: Obtaining multiple initial negative electrode sheet coating area widths corresponding to the negative electrode sheets of each battery core to be wound; For each battery core to be wound, determining each minimum negative electrode sheet coating area width from each initial negative electrode sheet coating area width; Arrange the minimum negative electrode coating area widths in ascending order to generate a second queue; A statistical calculation is performed on a preset number of data in the second queue to obtain a target negative electrode sheet coating area width corresponding to each battery core to be wound.

[0013] The battery core winding method provided in the embodiment of the present application obtains multiple initial negative electrode sheet coating area widths corresponding to the negative electrode sheets of each battery core to be wound. For each battery core to be wound, each minimum negative electrode sheet coating area width is determined from each initial negative electrode sheet coating area width; the minimum negative electrode sheet back coating area width is determined from each initial negative electrode sheet back coating area width, thereby ensuring the accuracy of the determined minimum negative electrode sheet coating area width and the minimum negative electrode sheet back coating area width. The minimum negative electrode sheet coating area widths are arranged in ascending order to generate a second queue, thereby ensuring the accuracy of the generated second queue. The first preset number of data in the second queue is statistically calculated to obtain the target negative electrode sheet coating area width corresponding to each battery core to be wound. The accuracy of the determined target negative electrode sheet coating area width is ensured, and the fault tolerance rate of the determined target negative electrode sheet coating area width is ensured to be high.

[0014] In an optional embodiment, obtaining a plurality of initial negative electrode sheet coating area widths corresponding to each negative electrode sheet of the battery core to be wound includes: For each battery roll core to be wound, detecting the total width of the negative electrode sheets corresponding to multiple detection positions of the battery roll to be wound based on the third detection camera; For each detection position, the total width of the negative electrode sheet is determined as the initial negative electrode sheet coating area width.

[0015] The battery core winding method provided in the embodiment of the present application, for each battery core to be wound, detects the total width of the negative electrode sheet corresponding to multiple detection positions of the battery roll to be wound based on the third detection camera, thereby ensuring the accuracy of the total width of the negative electrode sheet corresponding to each detection position obtained by detection. For each detection position, the total width of the negative electrode sheet is determined as the initial negative electrode sheet coating area width; the total width of the negative electrode sheet is determined as the initial negative electrode sheet reverse coating area width, thereby ensuring the accuracy of the initial negative electrode sheet coating area width corresponding to each detection position and the initial negative electrode sheet reverse coating area width.

[0016] In an optional embodiment, the target material line position corresponding to the battery core to be wound is calculated using the target positive electrode coating area width and the target negative electrode coating area width, including: Obtain the lower limit value of the bottom negative electrode coating area covering the positive electrode coating area along the width direction of the battery core to be wound and the lower limit value of the top negative electrode coating area covering the positive electrode coating area along the width direction; Calculating the width difference between the target positive electrode coating area width and the target negative electrode coating area width; Comparing the width difference with a preset width difference threshold; If the width difference is greater than or equal to the preset width difference threshold, the target material line position corresponding to the battery core to be wound is calculated based on the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core.

[0017] The battery core winding method provided in the embodiment of the present application obtains the lower limit of the positive and negative electrode sheet coating at the bottom of the core and the lower limit of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound. The width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width is calculated to ensure the accuracy of the calculated width difference. The width difference is compared with the preset width difference threshold; if the width difference is greater than or equal to the preset width difference threshold, it is determined that the width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width meets the requirements. According to the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core, the target material line position corresponding to the battery core to be wound is calculated to ensure the accuracy of the calculated target material line position corresponding to the battery core to be wound.

[0018] In an optional embodiment, the method further includes: If the width difference is less than the preset width difference threshold, an alarm message is output and the winding machine is controlled to stop to prompt the staff to replace the material for production.

[0019] The battery core winding method provided in the embodiment of the present application outputs an alarm message and controls the winding machine to stop if the width difference is less than a preset width difference threshold, so as to prompt the staff to replace the material for production, so that the staff can replace the material for production in time, thereby reducing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, and reducing the manufacturing cost.

[0020] In a second aspect, the present invention provides a battery core winding device, the device comprising: A first acquisition module is used to acquire a target positive electrode sheet coating area width corresponding to a positive electrode sheet of a battery core to be wound, wherein the positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along a width direction; A second acquisition module is used to obtain a target negative electrode sheet coating area width corresponding to a negative electrode sheet of a battery core to be wound, wherein the negative electrode sheet includes a negative electrode coating area; A calculation module, for calculating a target material line position corresponding to a battery core to be wound using a target positive electrode coating area width and a target negative electrode coating area width; The control module is used to control the winding machine body to wind the battery core to be wound according to the target material line position.

[0021] The battery core winding device provided in the embodiment of the present application obtains the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound, and obtains the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound. Then, the target positive electrode sheet coating area width and the target negative electrode sheet coating area width are used to calculate the target material line position corresponding to the battery core to be wound, thereby ensuring the accuracy of the calculated target material line position corresponding to the battery core to be wound. Then, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound, thereby ensuring the accuracy of winding the battery core to be wound. Therefore, there is no need for the winding production personnel to frequently adjust the winding material line position, thereby reducing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, and reducing the manufacturing cost.

[0022] In a third aspect, the present invention provides an electronic device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the battery core winding method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0023] In a fourth aspect, the present invention provides a winding machine, comprising an electronic device and a winding machine body, wherein the electronic device is used to execute the battery core winding method of the first aspect or any corresponding embodiment thereof.

[0024] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the battery core winding method of the first aspect or any corresponding embodiment thereof.

[0025] In a sixth aspect, the present invention provides a computer program product, comprising computer instructions, the computer instructions being used to enable a computer to execute the battery core winding method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic flow chart of a battery core winding method according to an embodiment of the present invention; Figure 2 is a schematic flow chart of another battery core winding method according to an embodiment of the present invention; Figure 3 2 is a schematic diagram of the mold-dividing structure of the positive electrode sheet according to an embodiment of the present invention; Figure 4 is a schematic flow chart of another battery core winding method according to an embodiment of the present invention; Figure 5 Schematic diagram of the coating structure of the positive surface area of ​​the positive and negative electrode sheets according to an embodiment of the present invention; Figure 6 Schematic diagram of the coating structure of the reverse surface area of ​​the positive and negative electrode sheets according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the process of improving X-ray defects by linkage of die slitting and winding equipment according to an embodiment of the present invention; Figure 8 is a structural block diagram of a battery core winding device according to an embodiment of the present invention; Fig. 9 It is a schematic diagram of the hardware structure of the electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] Secondary batteries are widely used in energy storage and power fields. They are formed by winding or lamination processes. The four main materials include positive electrode sheets, negative electrode sheets, separators and electrolytes. The winding process is selected as the mainstream process route by battery manufacturers due to its high efficiency and simple process.

[0030] During the winding process, the positive and negative electrode sheets and the separator are wound together by a winding needle to form a winding core, among which the size control of the coating area where the negative electrode sheet covers the positive electrode sheet is the key.

[0031] However, the existing positive electrode sheet lug side is coated with insulating glue on both sides, which can prevent burrs from piercing the diaphragm and causing battery short circuit, but the width of the protective layer fluctuates greatly. In addition, the total width of the incoming electrode sheet and the width of the electrode sheet after mold separation fluctuate, resulting in the difficulty in controlling the width consistency of the coating area on the front and back sides of the positive electrode sheet. Ultimately, the winding production personnel frequently adjust the position of the winding material line, while increasing the coating defect rate on the lug side and non-lug side of the winding positive and negative electrode sheets, thereby increasing the manufacturing cost.

[0032] Based on the above problems, an embodiment of the present application provides a battery core winding method, which obtains the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound, and obtains the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound. Then, the target positive electrode sheet coating area width and the target negative electrode sheet coating area width are used to calculate the target material line position corresponding to the battery core to be wound, thereby ensuring the accuracy of the calculated target material line position corresponding to the battery core to be wound. Then, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound, thereby ensuring the accuracy of winding the battery core to be wound. Therefore, there is no need for the winding production personnel to frequently adjust the winding material line position, thereby reducing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, and reducing the manufacturing cost.

[0033] It should be noted that the battery core winding method provided in the embodiment of the present application may be executed by a battery core winding device, which may be implemented as part or all of an electronic device through software, hardware, or a combination of software and hardware, wherein the electronic device may be a control device inside the winding machine, or may be an electronic device outside the winding machine that is connected to the winding machine for communication. In the following method embodiments, the execution subject is an electronic device as an example for explanation.

[0034] According to an embodiment of the present invention, an embodiment of a battery core winding method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0035] In this embodiment, a battery core winding method is provided, which can be used in the above-mentioned electronic device. Figure 1 is a flow chart of a battery core winding method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps: Step S101, obtaining a target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound.

[0036] The positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along the width direction.

[0037] Specifically, the electronic device can receive the target positive electrode sheet coating area width corresponding to the battery core to be wound input by the user, and can also receive the target positive electrode sheet coating area width corresponding to the battery core to be wound sent by other devices. The embodiment of the present application does not specifically limit the way in which the electronic device obtains the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound.

[0038] This step will be described in detail below.

[0039] Step S102, obtaining a target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound.

[0040] Wherein, the negative electrode sheet includes a negative electrode coating area.

[0041] Specifically, the electronic device can receive the target negative electrode sheet coating area width corresponding to the battery core to be wound input by the user, and can also receive the target negative electrode sheet coating area width corresponding to the battery core to be wound sent by other devices. The embodiment of the present application does not specifically limit the way in which the electronic device obtains the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound.

[0042] This step will be described in detail below.

[0043] Step S103, using the target positive electrode coating area width and the target negative electrode coating area width, calculate the target material line position corresponding to the battery core to be wound.

[0044] Among them, the material line position is the size of the negative electrode sheet at the bottom of the winding core that exceeds the positive electrode sheet.

[0045] This step will be described in detail below.

[0046] Step S104, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound.

[0047] Specifically, after determining the target material line position, the electronic device can control the winding machine body to wind the battery core to be wound according to the target material line position.

[0048] The battery core winding method provided in the embodiment of the present application obtains the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound, and obtains the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound. Then, the target positive electrode sheet coating area width and the target negative electrode sheet coating area width are used to calculate the target material line position corresponding to the battery core to be wound, thereby ensuring the accuracy of the calculated target material line position corresponding to the battery core to be wound. Then, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound, thereby ensuring the accuracy of winding the battery core to be wound. Therefore, there is no need for the winding production personnel to frequently adjust the winding material line position, thereby reducing the coating defect rate on the ear side and non-ear side of the winding positive and negative electrode sheets, and reducing the manufacturing cost.

[0049] In this embodiment, a battery core winding method is provided, which can be used in the above-mentioned electronic device. Figure 2is a flow chart of a battery core winding method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps: Step S201, obtaining a target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound.

[0050] The positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along the width direction.

[0051] Specifically, there are multiple battery cores to be wound, and the positive electrode sheets of the multiple battery cores to be wound are obtained by cutting the same positive electrode sheet roll. The above step S201 may include the following steps: Step S2011, obtaining multiple initial positive electrode sheet front coating area widths and multiple initial positive electrode sheet back coating area widths corresponding to each battery core to be wound.

[0052] It should be noted that the battery core winding method provided in the embodiment of the present application is a method based on the structural design of the positive electrode sheet with a protective layer. Therefore, the positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along the width direction, and the negative electrode sheet includes a negative electrode coating area. Since the coating of the protective layer may cause the width of the coating area on the front and back of the positive electrode sheet to be different, it is necessary to distinguish the front and back of the positive electrode sheet.

[0053] Specifically, the above step S2011 may include the following steps: Step a1: for each battery core to be wound, the width of the positive electrode sheet front protective layer and the width of the positive electrode sheet back protective layer corresponding to multiple inspection positions of the battery core to be wound are detected by a first inspection camera.

[0054] Specifically, for each battery roll core to be wound, the electronic device can shoot multiple detection positions of the positive electrode sheet before slitting based on the first detection camera to obtain multiple positive electrode sheet front images and positive electrode sheet negative images. The electronic device processes the collected positive electrode sheet front image and the negative electrode sheet negative image, including image enhancement, filtering, binarization and other operations to highlight the protective layer area in the positive electrode sheet front image and the negative electrode sheet negative image. Then, the electronic device can use an edge detection algorithm, such as the Canny edge detection algorithm, to detect the edges of the positive electrode sheet on both sides in the positive electrode sheet front image and the negative electrode sheet negative image. The electronic device can use pixel counting or other measurement methods to determine the width of the protective layer area in the positive electrode sheet front image, thereby obtaining the positive electrode sheet front protective layer width. The electronic device can use pixel counting or other measurement methods to determine the width of the protective layer area in the negative electrode sheet negative image, thereby obtaining the positive electrode sheet negative protective layer width.

[0055] like Figure 3As shown, the electronic device can photograph multiple detection positions of the positive electrode sheet before cutting based on the CCD detection camera 5 to obtain multiple positive electrode sheet front images and negative electrode sheet images.

[0056] Step a2, obtaining the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound based on the second detection camera.

[0057] Specifically, the electronic device can use the second detection camera to capture images of each detection position of the wound battery roll. Ensure the quality and clarity of the image for subsequent image processing and analysis. Then, the electronic device processes the positive electrode sheet image captured by the second detection camera, including image enhancement, filtering, binarization and other operations to highlight the features of the positive electrode sheet. Then, the electronic device uses an edge detection algorithm, such as Canny edge detection, to extract the edges of the positive electrode sheet image. The electronic device can obtain the total width of the positive electrode sheet by measuring the distance between the edges of the positive electrode sheet.

[0058] like Figure 3 As shown, the electronic device can take pictures of multiple detection positions of the cut electrode sheet material based on the CCD detection camera 6. The electrode sheet material includes a positive electrode sheet and a negative electrode sheet. Therefore, the electronic device can obtain the positive electrode sheet image.

[0059] Step a3: for each detection position, the width of the positive electrode sheet front protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet front coating area width corresponding to the detection position.

[0060] Specifically, for each detection position, the electronic device can use the total width of the positive electrode sheet minus the width of the positive electrode sheet front protective layer to obtain the initial positive electrode sheet front coating area width corresponding to the detection position.

[0061] Step a4, subtracting the width of the protective layer on the back side of the positive electrode sheet from the total width of the positive electrode sheet to obtain the width of the coating area on the back side of the initial positive electrode sheet corresponding to the detection position.

[0062] Specifically, the electronic device can use the total width of the positive electrode sheet minus the width of the protective layer on the back side of the positive electrode sheet to obtain the initial width of the coating area on the back side of the positive electrode sheet corresponding to the detection position.

[0063] In other implementations, the width of the coating area of ​​the positive electrode sheet may also be directly obtained by a CCD detection camera.

[0064] Step S2012, for each battery core to be wound, determine each maximum positive electrode sheet front coating area width from each initial positive electrode sheet front coating area width.

[0065] Specifically, for each battery core to be wound, the electronic device can compare the initial positive electrode sheet front coating area widths at each detection position corresponding to the battery core to be wound. Then, the maximum positive electrode sheet front coating area widths are determined from the initial positive electrode sheet front coating area widths, that is, each battery core to be wound corresponds to a maximum positive electrode sheet front coating area width.

[0066] Step S2013, determining each maximum positive electrode sheet back side coating area width from each initial positive electrode sheet back side coating area width.

[0067] Specifically, for each battery core to be wound, the electronic device can compare the initial positive electrode sheet back coating area widths at each detection position corresponding to the battery core to be wound. Then, the maximum positive electrode sheet back coating area widths are determined from the initial positive electrode sheet back coating area widths, that is, each battery core to be wound corresponds to a maximum positive electrode sheet back coating area width.

[0068] Step S2014, arranging the maximum positive electrode sheet front coating area widths and the maximum positive electrode sheet back coating area widths in descending order to generate a first queue.

[0069] Specifically, the electronic device can arrange the maximum positive electrode sheet front coating area widths and the maximum positive electrode sheet back coating area widths in descending order to generate a first queue.

[0070] Step S2015, performing statistical calculations on a preset number of data in the first queue to obtain a target positive electrode sheet coating area width corresponding to each battery core to be wound.

[0071] Specifically, the electronic device can determine a previously preset number of data from the first queue, and then perform statistical calculations on the previously preset number of data in the first queue to obtain a target positive electrode sheet coating area width corresponding to each battery core to be wound.

[0072] The preset number may be 30, 20, or 40, and the embodiment of the present application does not specifically limit the preset number.

[0073] Among them, statistical calculations may include average calculations, median calculations, etc., and the embodiments of the present application do not specifically limit statistical calculations.

[0074] Step S202, obtaining a target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound.

[0075] Wherein, the negative electrode sheet includes a negative electrode coating area.

[0076] Specifically, there are multiple battery cores to be wound, and the above step S202 may include the following steps: Step S2021, obtaining multiple initial negative electrode sheet coating area widths corresponding to the negative electrode sheets of each battery core to be wound.

[0077] It should be noted that both the front and back sides of the negative electrode sheet are fully coated, that is, the main area of ​​the negative electrode sheet is completely coated with negative electrode coating, so the coating area widths on both sides of the negative electrode sheet are the same. That is, the width of the initial coating area on the front side of the negative electrode sheet is the same as the width of the initial negative electrode sheet coating area on the back side. That is, the initial negative electrode sheet coating area width represents both the width of the initial negative electrode sheet coating area on the front side and the width of the initial negative electrode sheet coating area on the back side.

[0078] Specifically, the above step S2021 may include the following steps: Step b1: for each battery roll core to be wound, the total width of the negative electrode sheets corresponding to multiple inspection positions of the battery roll to be wound is detected based on the third inspection camera.

[0079] Specifically, the electronic device can use the third detection camera to capture images of each detection position of the wound battery roll. Ensure the quality and clarity of the image for subsequent image processing and analysis. Then, the electronic device processes the negative electrode sheet image captured by the second detection camera, including image enhancement, filtering, binarization and other operations to highlight the features of the negative electrode sheet. Then, the electronic device uses an edge detection algorithm, such as Canny edge detection, to extract the edges of the negative electrode sheet image. The electronic device can obtain the total width of the negative electrode sheet by measuring the distance between the edges of the negative electrode sheet.

[0080] like Figure 3 As shown, the electronic device can take pictures of multiple detection positions of the cut electrode sheet material based on the CCD detection camera 6. The electrode sheet material includes a positive electrode sheet and a negative electrode sheet. Therefore, the electronic device can obtain the negative electrode sheet image.

[0081] Step b2: for each detection position, the total width of the negative electrode sheet is determined as the initial negative electrode sheet coating area width.

[0082] Specifically, for each detection position, the electronic device determines the total width of the negative electrode sheet as the initial negative electrode sheet coating area width.

[0083] Step S2022: for each battery core to be wound, determine each minimum negative electrode sheet coating area width from each initial negative electrode sheet coating area width.

[0084] Specifically, for each battery core to be wound, the electronic device can compare the initial negative electrode sheet coating area widths of each detection position corresponding to the battery core to be wound, and then determine each minimum negative electrode sheet coating area width from each initial negative electrode sheet coating area width.

[0085] Specifically, for each battery core to be wound, the electronic device can compare the initial negative electrode sheet back coating area widths at each detection position corresponding to the battery core to be wound, and then determine the minimum negative electrode sheet back coating area width from each initial negative electrode sheet back coating area width.

[0086] Step S2023, arranging the minimum negative electrode coating area widths in ascending order to generate a second queue.

[0087] Specifically, the electronic device can arrange the minimum negative electrode sheet coating area widths in ascending order to generate a second queue.

[0088] Step S2024, performing statistical calculations on the first preset number of data in the second queue to obtain the target negative electrode sheet coating area width corresponding to each battery core to be wound.

[0089] Specifically, the electronic device can determine a previously preset number of data from the second queue, and then perform statistical calculations on the previously preset number of data in the second queue to obtain a target negative electrode sheet coating area width corresponding to each battery core to be wound.

[0090] The preset number may be 30, 20, or 40, and the embodiment of the present application does not specifically limit the preset number.

[0091] Among them, statistical calculations may include average calculations, median calculations, etc., and the embodiments of the present application do not specifically limit statistical calculations.

[0092] Step S203, using the target positive electrode coating area width and the target negative electrode coating area width, calculate the target material line position corresponding to the battery core to be wound.

[0093] For details about this step, please refer to the above description of step S103, which will not be elaborated here.

[0094] Step S204, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound.

[0095] For details about this step, please refer to the above description of step S104, which will not be elaborated here.

[0096] The battery core winding method provided in the embodiment of the present application, for each battery core to be wound, detects the positive electrode sheet front protective layer width and the positive electrode sheet back protective layer width corresponding to multiple detection positions of the battery core to be wound based on the first detection camera, thereby ensuring the accuracy of the positive electrode sheet front protective layer width and the positive electrode sheet back protective layer width corresponding to multiple detection positions of the battery core to be wound. The total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound is obtained based on the second detection camera, thereby ensuring the accuracy of the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound. For each detection position, the width of the positive electrode sheet front protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet front coating area width corresponding to the detection position, thereby ensuring the accuracy of the initial positive electrode sheet front coating area width corresponding to each detection position. The width of the positive electrode sheet back protective layer is subtracted from the total width of the positive electrode sheet to obtain the initial positive electrode sheet back coating area width corresponding to the detection position. The accuracy of the initial positive electrode sheet back coating area width corresponding to each detection position is ensured.

[0097] For each battery core to be wound, the maximum positive electrode sheet front coating area width is determined from each initial positive electrode sheet front coating area width; the maximum positive electrode sheet back coating area width is determined from each initial positive electrode sheet back coating area width, ensuring the accuracy of the determined maximum positive electrode sheet front coating area width and the maximum positive electrode sheet back coating area width. The maximum positive electrode sheet front coating area width and the maximum positive electrode sheet back coating area width are arranged in descending order to generate a first queue, ensuring the accuracy of the generated first queue. The first preset number of data in the first queue is statistically calculated to obtain the target positive electrode sheet coating area width corresponding to each battery core to be wound, ensuring the accuracy of the determined target positive electrode sheet coating area width, and ensuring that the determined target positive electrode sheet coating area width has a high fault tolerance rate.

[0098] In addition, for each battery roll to be wound, the total width of the negative electrode sheet corresponding to multiple detection positions of the battery roll to be wound is detected based on the third detection camera, ensuring the accuracy of the total width of the negative electrode sheet corresponding to each detection position. For each detection position, the total width of the negative electrode sheet is determined as the initial negative electrode sheet coating area width; the total width of the negative electrode sheet is determined as the initial negative electrode sheet reverse coating area width, ensuring the accuracy of the initial negative electrode sheet coating area width and the initial negative electrode sheet reverse coating area width corresponding to each detection position. For each battery roll to be wound, the minimum negative electrode sheet coating area width is determined from each initial negative electrode sheet coating area width; the minimum negative electrode sheet reverse coating area width is determined from each initial negative electrode sheet reverse coating area width, ensuring the accuracy of the minimum negative electrode sheet coating area width and the minimum negative electrode sheet reverse coating area width. The minimum negative electrode sheet coating area widths are arranged in ascending order to generate a second queue, ensuring the accuracy of the generated second queue. The first preset number of data in the second queue is statistically calculated to obtain the target negative electrode coating area width corresponding to each battery core to be wound, thereby ensuring the accuracy of the determined target negative electrode coating area width and ensuring a high error tolerance of the determined target negative electrode coating area width.

[0099] In this embodiment, a battery core winding method is provided, which can be used in the above-mentioned electronic device. Figure 4 is a flow chart of a battery core winding method according to an embodiment of the present invention. Figure 4 As shown, the process includes the following steps: Step S301, obtaining a target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound.

[0100] The positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along the width direction.

[0101] For details about this step, please refer to the above description of step S201, which will not be elaborated here.

[0102] Step S302, obtaining a target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound.

[0103] Wherein, the negative electrode sheet includes a negative electrode coating area.

[0104] For details about this step, please refer to the above description of step S202, which will not be elaborated here.

[0105] Step S303, using the target positive electrode coating area width and the target negative electrode coating area width, calculate the target material line position corresponding to the battery core to be wound.

[0106] Specifically, the above step S303 may include the following steps: Step S3031, obtaining the lower limit value of the bottom negative electrode coating area covering the positive electrode coating area along the width direction of the battery core to be wound and the lower limit value of the top negative electrode coating area covering the positive electrode coating area along the width direction.

[0107] Among them, the lower limit of the negative electrode sheet coating area covering the positive electrode sheet coating area refers to the width of the negative electrode sheet coating area exceeding the positive electrode sheet coating area.

[0108] Specifically, the electronic device can receive the input lower limit values ​​of the positive and negative electrode sheet coating at the bottom of the core and the lower limit values ​​of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound, and can also receive the lower limit values ​​of the positive and negative electrode sheet coating at the bottom of the core and the lower limit values ​​of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound sent by other devices. The electronic device can also determine the lower limit values ​​of the positive and negative electrode sheet coating at the bottom of the core and the lower limit values ​​of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound according to the coating range of the positive and negative electrode sheets of the target battery at the bottom and top of the core.

[0109] The embodiment of the present application does not specifically limit the manner in which the electronic device obtains the lower limit values ​​of the positive and negative electrode sheet coating at the bottom of the battery core to be wound and the lower limit values ​​of the positive and negative electrode sheet coating at the top of the core.

[0110] Step S3032, calculating the width difference between the target positive electrode coating area width and the target negative electrode coating area width.

[0111] Specifically, the electronic device can calculate the width difference by subtracting the target positive electrode sheet coating area width from the target negative electrode sheet coating area width.

[0112] Step S3033, comparing the width difference with a preset width difference threshold.

[0113] Specifically, the electronic device can receive a preset width difference threshold input by a user, or can receive a preset width difference threshold sent by other devices. The electronic device can also set the preset width difference threshold based on the attribute information or functional requirements of the target battery corresponding to the battery core to be wound.

[0114] The embodiment of the present application does not specifically limit the manner in which the electronic device obtains the preset width difference threshold.

[0115] Then, the electronic device compares the width difference with a preset width difference threshold.

[0116] Step S3034, if the width difference is greater than or equal to the preset width difference threshold, the target material line position corresponding to the battery core to be wound is calculated based on the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core.

[0117] Specifically, if the width difference is greater than or equal to the preset width difference threshold, the target material line position corresponding to the battery core to be wound is calculated based on the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core.

[0118] Exemplarily, the electronic device can calculate the target material line position according to the following formula: Target material line position = (target negative electrode coating area width - target positive electrode coating area width + lower limit of positive and negative electrode coating at the bottom of the winding core - lower limit of positive and negative electrode coating at the top of the winding core) / 2.

[0119] Step S3035: If the width difference is less than the preset width difference threshold, an alarm message is output and the winding machine is controlled to stop to prompt the staff to replace the material for production.

[0120] Specifically, if the width difference is less than a preset width difference threshold, the electronic device outputs an alarm message and controls the winding machine to stop, so as to prompt the staff to replace the material for production.

[0121] Step S304, according to the target material line position, the winding machine body is controlled to wind the battery core to be wound.

[0122] For details about this step, please refer to the above description of step S204, which will not be elaborated here.

[0123] The battery core winding method provided in the embodiment of the present application obtains the lower limit of the positive and negative electrode sheet coating at the bottom of the core and the lower limit of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound. The width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width is calculated to ensure the accuracy of the calculated width difference. The width difference is compared with the preset width difference threshold; if the width difference is greater than or equal to the preset width difference threshold, it is determined that the width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width meets the requirements. According to the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core, the target material line position corresponding to the battery core to be wound is calculated to ensure the accuracy of the calculated target material line position corresponding to the battery core to be wound. If the width difference is less than the preset width difference threshold, an alarm message is output and the winding machine is controlled to stop to prompt the staff to change materials for production, so that the staff can change materials for production in time, thereby reducing the coating defect rate on the pole ear side and non-pole ear side of the winding positive and negative electrodes, and reducing manufacturing costs.

[0124] In order to better introduce the battery core winding method provided in the embodiment of the present application. Figure 2 As shown, it is a schematic diagram of the positive electrode mold structure. Before the positive electrode is cut, a CCD detection camera 5 is set on the back of the electrode. After the positive electrode is cut, a CCD detection camera 6 and a front CCD detection camera 7 are respectively set on the upper and lower electrode fronts. The CCD detection camera 5 on the back of the electrode detects the width of the protective layer on both sides of the electrode before cutting, the CCD detection camera 6 on the front of the electrode detects the total width of the lower electrode after cutting and the width of the front coating area 1a, and the CCD detection camera 7 on the front of the electrode detects the total width of the upper electrode after cutting and the width of the front coating 1b. The width of the protective layer on both sides of the electrode before cutting detected by the CCD detection camera 5 on the back of the electrode is linked with the total width of the upper and lower electrode detected by the CCD detection cameras 6 / 7 on the front of the electrode after cutting, so as to obtain the width of the reverse coating area of ​​the upper and lower electrode after cutting.

[0125] like Figure 5 The figure shows the schematic diagram of the coating structure of the positive and negative electrode sheets, wherein one side of the positive and negative electrode sheets is provided with a pole ear (i.e., the pole ear side, and the other side is the non-pole ear side), and a protective layer is provided on the pole ear side of the positive electrode sheet. The total width of the positive electrode sheet b1 = the width d1 of the front coating area 1 + the width a1 of the front protective layer area 3. The width of the negative electrode sheet c1-the width d1 of the front coating area 1 = the width s1 of the negative electrode coated on the pole ear side + the width s2 of the negative electrode coated on the non-pole ear side. The protective layer area corresponds to the area on the positive electrode sheet where the protective layer is provided.

[0126] like Figure 6 As shown, it is a schematic diagram of the coating structure of the reverse coating area of ​​the positive and negative electrode sheets, the total width of the positive electrode sheet b1 = the width d2 of the reverse coating area 11 + the width a2 of the reverse protective layer area 13. The width of the negative electrode sheet c1-the width d2 of the reverse coating area 11 = the width s3 of the negative electrode coating the positive electrode on the tab side + the width s4 of the negative electrode coating the positive electrode on the non-tab side.

[0127] like Figure 7The schematic diagram of the process of improving X-ray defects by linking the die slitting and winding equipment is shown. In the die slitting process, the CCD detects the width of the coating area on the front and back sides of each EA (each, i.e., the length of the positive electrode sheet of a battery cell to be wound) of each roll of positive electrode sheet after slitting. The maximum values ​​of the width of the coating area on the front and back sides of each EA of each roll of positive electrode sheet are sorted in descending order, and the average value of the first 30 values ​​from large to small is taken as the width of the coating area of ​​the positive electrode sheet and automatically entered into the MES (Manufacturing ExecutionSystem) system; in the die-cutting process, the CCD detects the width of each EA negative electrode sheet in each roll of negative electrode sheet after cutting (i.e., the width of the corresponding negative electrode sheet coating area), and arranges the minimum values ​​of the width of each EA negative electrode sheet in each roll of negative electrode sheet in ascending order, and takes the average value of the first 30 values ​​from small to large as the negative electrode sheet width and automatically enters it into the MES system; the winding machine sets the threshold value of the difference between the width of the negative electrode sheet and the width of the positive electrode sheet coating area. When the difference between the width of the negative electrode sheet and the width of the positive electrode sheet coating area ≥ the set threshold, the winding machine control system automatically calculates and adjusts the position of the material line after reeling according to the width of the positive electrode sheet coating area and the width of the negative electrode sheet. The material line position = (negative electrode sheet width - positive electrode sheet coating area width + lower limit of the positive and negative electrode sheet coating at the bottom of the roll core - lower limit of the positive and negative electrode sheet coating at the top of the roll core) / 2; when the difference between the width of the negative electrode sheet and the width of the positive electrode sheet coating area < the set threshold, the winding machine alarms and stops, prompting employees to change materials for production.

[0128] In this embodiment, a battery core winding device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be repeated here. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0129] This embodiment provides a battery core winding device, such as Figure 8 As shown, including: A first acquisition module 401 is used to acquire a target positive electrode sheet coating area width corresponding to a positive electrode sheet of a battery core to be wound, wherein the positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along a width direction; A second acquisition module 402 is used to acquire a target negative electrode sheet coating area width corresponding to a negative electrode sheet of a battery core to be wound, wherein the negative electrode sheet includes a negative electrode coating area; A calculation module 403 is used to calculate a target material line position corresponding to the battery core to be wound using a target positive electrode coating area width and a target negative electrode coating area width; The control module 404 is used to control the winding machine body to wind the battery core to be wound according to the target material line position.

[0130] In some optional embodiments, there are multiple battery cores to be wound, and the positive electrode sheets of the multiple battery cores to be wound are obtained by cutting the same positive electrode sheet roll. The first acquisition module 401 is specifically used to obtain multiple initial positive electrode sheet front coating area widths and multiple initial positive electrode sheet back coating area widths corresponding to each battery core to be wound; for each battery core to be wound, determine each maximum positive electrode sheet front coating area width from each initial positive electrode sheet front coating area width; determine each maximum positive electrode sheet back coating area width from each initial positive electrode sheet back coating area width; arrange each maximum positive electrode sheet front coating area width and each maximum positive electrode sheet back coating area width in descending order to generate a first queue; perform statistical calculations on the first preset number of data in the first queue to obtain the target positive electrode sheet coating area width corresponding to each battery core to be wound.

[0131] In some optional embodiments, the first acquisition module 401 is specifically used to detect, for each battery core to be wound, the width of the positive electrode sheet front protective layer and the width of the positive electrode sheet back protective layer corresponding to multiple detection positions of the battery core to be wound based on the first detection camera; to obtain the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery roll to be wound based on the second detection camera; for each detection position, to subtract the width of the positive electrode sheet front protective layer from the total width of the positive electrode sheet to obtain the initial width of the positive electrode sheet front coating area corresponding to the detection position; to subtract the width of the positive electrode sheet back protective layer from the total width of the positive electrode sheet to obtain the initial width of the positive electrode sheet back coating area corresponding to the detection position.

[0132] In some optional embodiments, there are multiple battery cores to be wound, and the second acquisition module 402 is specifically used to obtain multiple initial negative electrode sheet coating area widths corresponding to the negative electrode sheets of each battery core to be wound; for each battery core to be wound, determine each minimum negative electrode sheet coating area width from each initial negative electrode sheet coating area width; arrange each minimum negative electrode sheet coating area width in ascending order to generate a second queue; perform statistical calculations on a preset number of data in the second queue to obtain a target negative electrode sheet coating area width corresponding to each battery core to be wound.

[0133] In some optional embodiments, the second acquisition module 402 is specifically used to detect the total width of the negative electrode sheets corresponding to multiple detection positions of the battery roll to be wound based on the third detection camera for each battery roll core to be wound; for each detection position, the total width of the negative electrode sheet is determined as the width of the initial negative electrode sheet coating area; the total width of the negative electrode sheet is determined as the width of the initial negative electrode sheet back coating area.

[0134] In some optional embodiments, the calculation module 403 is specifically used to obtain the lower limit value of the bottom negative electrode sheet coating area covering the positive electrode sheet coating area along the width direction of the battery core to be wound and the lower limit value of the top negative electrode sheet coating area covering the positive electrode sheet coating area along the width direction; calculate the width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width; compare the width difference with a preset width difference threshold; if the width difference is greater than or equal to the preset width difference threshold, obtain the lower limit value of the positive and negative electrode sheet coating at the bottom of the core and the lower limit value of the positive and negative electrode sheet coating at the top of the core corresponding to the battery core to be wound; calculate the target material line position corresponding to the battery core to be wound according to the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit value of the positive and negative electrode sheet coating at the bottom of the core and the lower limit value of the positive and negative electrode sheet coating at the top of the core.

[0135] In some optional implementations, the calculation module 403 is specifically configured to output an alarm message and control the winding machine to stop if the width difference is less than a preset width difference threshold, so as to prompt the staff to replace the material for production.

[0136] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0137] The battery core winding device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0138] The embodiment of the present invention also provides an electronic device having the above Figure 8 The battery core winding device shown.

[0139] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of an electronic device provided by an optional embodiment of the present invention, such as Fig. 9As shown, the electronic device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple electronic devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig. 9 A processor 10 is taken as an example.

[0140] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0141] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0142] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0143] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0144] The electronic device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Fig. 9 The example of connecting through bus is taken in the following.

[0145] The input device 30 can receive input digital or character information and generate signal input related to the user settings and function control of the electronic device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0146] An embodiment of the present invention further provides a winding machine, including an electronic device and a winding machine body, wherein the electronic device is used to execute the battery core winding method of any of the above embodiments.

[0147] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0148] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0149] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery core winding method, characterized in that: The method comprises: Obtaining a target positive electrode sheet coating area width corresponding to a positive electrode sheet of a battery core to be wound, wherein the positive electrode sheet comprises a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along a width direction; Obtaining a target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound, wherein the negative electrode sheet includes a negative electrode coating area; Calculating a target material line position corresponding to the battery core to be wound using the target positive electrode sheet coating area width and the target negative electrode sheet coating area width; According to the target material line position, the winding machine body is controlled to wind the battery core to be wound.

2. The method according to claim 1, characterized in that: The number of the battery cores to be wound is multiple, and the positive electrode sheets of the multiple battery cores to be wound are obtained by slitting the same positive electrode sheet roll, and the step of obtaining the target positive electrode sheet coating area width corresponding to the positive electrode sheet of the battery core to be wound includes: Obtaining a plurality of initial positive electrode sheet front coating area widths and a plurality of initial positive electrode sheet back coating area widths corresponding to each of the battery cores to be wound; For each of the battery cores to be wound, determining each maximum positive electrode sheet front coating area width from each of the initial positive electrode sheet front coating area widths; Determine each maximum positive electrode sheet back coating area width from each of the initial positive electrode sheet back coating area widths; Arrange the maximum positive electrode sheet front coating area widths and the maximum positive electrode sheet back coating area widths in descending order to generate a first queue; Statistical calculation is performed on a preset number of data in the first queue to obtain the target positive electrode sheet coating area width corresponding to each of the battery cores to be wound.

3. The method according to claim 2, characterized in that The obtaining of a plurality of initial positive electrode sheet front coating area widths and a plurality of initial positive electrode sheet back coating area widths corresponding to each of the battery cores to be wound comprises: For each of the battery cores to be wound, the width of the positive electrode sheet front protective layer and the width of the positive electrode sheet back protective layer corresponding to multiple detection positions of the battery core to be wound are detected by the first detection camera; Acquire the total width of the positive electrode sheet corresponding to each detection position corresponding to the battery core to be wound based on the second detection camera; For each of the detection positions, the width of the positive electrode sheet front protection layer is subtracted from the total width of the positive electrode sheet to obtain the width of the initial positive electrode sheet front coating area corresponding to the detection position; The width of the coating area on the back side of the initial positive electrode sheet corresponding to the detection position is obtained by subtracting the width of the protective layer on the back side of the positive electrode sheet from the total width of the positive electrode sheet.

4. The method according to claim 1, characterized in that: The number of the battery cores to be wound is multiple, and obtaining the target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound includes: Obtaining a plurality of initial negative electrode sheet coating area widths corresponding to the negative electrode sheets of the battery core to be wound; For each of the battery cores to be wound, determining each minimum negative electrode sheet coating area width from each of the initial negative electrode sheet coating area widths; Arranging the minimum negative electrode sheet coating area widths in ascending order to generate a second queue; Statistical calculation is performed on a preset number of data in the second queue to obtain the target negative electrode sheet coating area width corresponding to each of the battery cores to be wound.

5. The method according to claim 4, characterized in that The obtaining of a plurality of initial negative electrode sheet coating area widths corresponding to each of the negative electrode sheets of the battery core to be wound comprises: For each of the battery roll cores to be wound, detecting the total width of the negative electrode sheets corresponding to multiple detection positions of the battery roll to be wound based on a third detection camera; For each of the detection positions, the total width of the negative electrode sheet is determined as the initial negative electrode sheet coating area width.

6. The method according to claim 1, characterized in that The method of calculating the target material line position corresponding to the battery core to be wound by using the target positive electrode sheet coating area width and the target negative electrode sheet coating area width comprises: Obtaining a lower limit value of the bottom negative electrode coating area covering the positive electrode coating area along the width direction of the battery core to be wound and a lower limit value of the top negative electrode coating area covering the positive electrode coating area along the width direction; Calculating a width difference between the target positive electrode sheet coating area width and the target negative electrode sheet coating area width; Comparing the width difference with a preset width difference threshold; If the width difference is greater than or equal to the preset width difference threshold, the target material line position corresponding to the battery core to be wound is calculated based on the relationship between the target positive electrode sheet coating area width, the target negative electrode sheet coating area width, the lower limit of the positive and negative electrode sheet coating at the bottom of the core, and the lower limit of the positive and negative electrode sheet coating at the top of the core.

7. The method according to claim 6, characterized in that The method further comprises: If the width difference is less than the preset width difference threshold, an alarm message is output, and the winding machine is controlled to stop, so as to prompt the staff to replace the material for production.

8. A battery core winding device, characterized in that: The device comprises: A first acquisition module is used to acquire a target positive electrode sheet coating area width corresponding to a positive electrode sheet of a battery core to be wound, wherein the positive electrode sheet includes a positive electrode coating area and a protective layer located on at least one side of the positive electrode coating area along a width direction; A second acquisition module is used to acquire a target negative electrode sheet coating area width corresponding to the negative electrode sheet of the battery core to be wound, wherein the negative electrode sheet includes a negative electrode coating area; A calculation module, used to calculate the target material line position corresponding to the battery core to be wound by using the target positive electrode sheet coating area width and the target negative electrode sheet coating area width; The control module is used to control the winding machine body to wind the battery core to be wound according to the target material line position.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the battery core winding method according to any one of claims 1 to 7 by executing the computer instructions.

10. A winding machine, characterized in that: It includes electronic equipment and a winding machine body. The electronic device is used to execute the battery core winding method according to any one of claims 1 to 7.

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