Roll core pole piece deviation rectification method and system, computer readable storage medium and electronic equipment

Abstract

The invention discloses a roll core pole piece deviation rectifying method and system, a computer readable storage medium and electronic equipment, and belongs to the technical field of lithium battery manufacturing, and the roll core pole piece deviation rectifying method comprises the following steps: arranging a detection device at a winding station; detecting the phase difference a between the tab side edge of the positive plate and the tab side edge of the negative plate; detecting the phase difference b between the non-tab side edge of the positive plate and the non-tab side edge of the negative plate; the phase difference value of the phase difference a and the phase difference b is calculated and recorded as c, and the absolute value of the phase difference value c is fed back to the deviation correcting mechanism; and performing deviation correction, and controlling the phase difference value c within a preset required range. According to the method, the phase difference of the tab side and the phase difference of the non-tab side are considered, so that the probability that the positive plate is wrapped by the negative plate is greatly improved, and balanced deviation correction is realized, so that the process yield is improved, and the effect of reducing the cost is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and specifically, to a method and system for correcting the deviation of the core pole piece, a computer-readable storage medium, and an electronic device. Background Art

[0002] With the increasingly fierce competition in the lithium battery industry, the requirements for cost control are getting higher and higher, and the corresponding requirements for production yield are also continuously increasing. Inside the same lithium battery, there are positive and negative electrodes, and the positive and negative electrodes exist in the form of sheets inside the battery. According to the basic requirements of the current power battery design, it is necessary that the negative electrode can wrap the positive electrode with a certain phase difference. In the existing winding equipment, a basic material line is usually set, and the positive and negative electrode sheets will be corrected to the basic material line by the deviation correction actuator according to the actual position detected by the deviation correction sensor.

[0003] For example, the Chinese patent document with the publication number CN116031502A discloses a method and system for predicting the wrinkling of a core winding pole piece, including: detecting the deviation fluctuation between the edge position of the pole piece at the winding needle and the set reference position by a CCD camera at the winding needle; detecting the deviation correction amplitude of each deviation correction mechanism from the unwinding to the winding of the pole piece; calculating the maximum deviation correction amplitude T within a fixed length of each deviation correction mechanism during winding max and the absolute value △T of the difference between adjacent two deviation correction amplitude data, and at the same time calculating the absolute value △H of the difference between adjacent two values of the deviation between the edge position of the pole piece at the winding needle and the set reference position, T max and △T, △H values are respectively compared with the set values to predict whether the pole piece is wrinkled. However, the CCD camera and the deviation correction mechanism in this document can only detect the non-tab side edge position of the pole piece, and can only ensure that one side of the positive and negative electrode sheets is on the basic material line, while the other side is affected by factors such as the size fluctuation of the positive and negative electrode sheets themselves, and there is a possibility that the negative electrode sheet cannot wrap the positive electrode sheet with the required phase difference. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for correcting the deviation of the core pole piece, a computer-readable storage medium, and an electronic device, so as to solve the problem in the prior art that the core winding equipment can only ensure that one side of the positive and negative electrode sheets is on the basic material line, while the other side is affected by factors such as the size fluctuation of the positive and negative electrode sheets themselves, and there is a possibility that the negative electrode sheet cannot wrap the positive electrode sheet with the required phase difference.

[0005] To achieve the above purpose, the present invention provides a method for correcting the deviation of the core pole piece, including the following steps:

[0006] S1. Arrange a detection device at the winding station;

[0007] S2. Detect the phase difference a between the tab side edge of the positive electrode sheet and the tab side edge of the negative electrode sheet;

[0008] S3. Detect the phase difference b between the non-tab side edge of the positive electrode sheet and the non-tab side edge of the negative electrode sheet;

[0009] S4. Calculate the phase difference difference between phase difference a and phase difference b, denoted as c, and feedback the absolute value of the phase difference difference c to the rectifying mechanism;

[0010] S5. Perform rectification to control the phase difference difference c within the preset requirement range.

[0011] If the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, rectify and move the positive electrode sheet towards the tab side to make the phase difference difference c return to the preset requirement range. The positive electrode sheet is located outside the negative electrode sheet, and the offset amplitude is easy to detect. Moreover, when rectifying, only the positive electrode sheet is controlled to move, and the control logic is simple, which can reduce the movement error.

[0012] If the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, rectify and move the negative electrode sheet towards the non-tab side to make the phase difference difference c return to the preset requirement range. Only the negative electrode sheet is controlled to move, and the control logic is simple. Moreover, the negative electrode sheet needs to wrap the positive electrode sheet, and the negative electrode sheet has a relatively larger size, and the edge of the negative electrode sheet will exceed the edge of the positive electrode sheet, which is easy to detect.

[0013] If the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, rectify and move the positive electrode sheet towards the tab side, and at the same time rectify and move the negative electrode sheet towards the non-tab side to make the phase difference difference c return to the preset requirement range. Moving the positive and negative electrode sheets simultaneously can average the rectification amount, avoid excessive rectification amount of the negative electrode sheet or the positive electrode sheet, and prevent the phenomena of pole piece wrinkling and tape breakage.

[0014] Rectify and move the positive electrode sheet towards the tab side by c / 4, and rectify and move the negative electrode sheet towards the non-tab side by c / 4 to obtain the rectified phase difference difference c' = 0. When the c' value is close to or equal to 0, the phase difference between the tab side and the non-tab side can make full use of the fluctuations of the incoming material, clearly identify the situation of the incoming material edge, and timely detect phenomena such as wrinkling and tape breakage.

[0015] Before winding, set a material line L1 at the non-tab side edge of the positive electrode sheet and a material line L3 at the tab side edge; set a material line L2 at the non-tab side edge of the negative electrode sheet and a material line L4 at the tab side edge; detect the distance between the material line L1 and the material line L2 to judge the phase difference at the tab side, and detect the distance between the material line L3 and the material line L4 to judge the phase difference at the non-tab side.

[0016] Detect the distance between the material line L1 and the material line L2 at multiple points on the tab side edge and calculate the average value to obtain the phase difference a, and detect the distance between the material line L3 and the material line L4 at multiple points on the non-tab side edge and calculate the average value to obtain the phase difference b. The method of detecting at multiple points and calculating the average value can improve the reliability of the data and avoid detection errors caused by single-point detection.

[0017] The present invention also provides a core pole piece deviation correction system, including

[0018] a detection device, which is arranged corresponding to the winding station and is used to detect the phase difference between the ear side edges of the positive and negative pole pieces and the phase difference between the non-ear side edges;

[0019] a calculation module, which is electrically connected to the detection device and is used to calculate the difference between the phase difference of the ear side edges and the phase difference of the non-ear side edges;

[0020] a deviation correction mechanism, which receives the difference signal of the phase difference fed back by the calculation module and executes the pole piece deviation correction action.

[0021] The present invention also provides a computer-readable storage medium for storing a program, and when the program is executed, the steps of the above-mentioned core pole piece deviation correction method are realized.

[0022] The present invention also provides an electronic device, including: a processor; a memory, which stores executable instructions of the processor; wherein, the processor is configured to execute the steps of the above-mentioned core pole piece deviation correction method by executing the executable instructions.

[0023] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, the following beneficial effects are achieved:

[0024] A core pole piece deviation correction method of the present invention, by detecting the phase differences between the ear side edges and the non-ear side edges of the positive and negative pole pieces and calculating the difference between the two phase differences, feeds back the difference to the deviation correction mechanism to execute the deviation correction action so that the difference of the phase difference is controlled within a preset requirement range. Considering both the phase difference on the ear side and the phase difference on the non-ear side, the probability that the negative pole piece wraps the positive pole piece is greatly improved, and the deviation correction is balanced, thereby improving the process yield and achieving the effect of cost reduction.

[0025] Obviously, the elements or features described in the above single embodiment can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the drawings, the dimensions and ratios do not represent the dimensions and ratios of the actual products. The drawings are merely illustrative and, for the sake of clarity, some non-essential elements or features are omitted.

[0027] Figure 1 is a schematic structural diagram of a core winding on a winding needle in the prior art;

[0028] Figure 2 is a schematic flow diagram of the core pole piece deviation correction method in an embodiment of the present invention;

[0029] Figure 3It is a schematic diagram of the positions of the positive and negative electrode plates in the embodiments of the present invention.

[0030] Description of the reference numerals

[0031] 110, separator; 120, positive electrode plate; 130, negative electrode plate; 200, winding pin; 300, detection device. Specific embodiments

[0032] Next, the present invention will be described in detail with reference to the accompanying drawings. What is described here is only the preferred embodiment of the present invention. Those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiment, and these other ways also fall within the scope of the present invention.

[0033] In the prior art, as Figure 1 shown, the separator 110, the positive electrode plate 120, the separator 110, and the negative electrode plate 130 are sequentially wound around the winding pin 200 to form a core. Viewed from a perspective perpendicular to the outermost separator 110, it can be seen that the negative electrode plate 130 is required to wrap the positive electrode plate 120 with a certain phase difference to meet the process requirements of the power battery. In order to improve the qualification rate of the core, the existing solutions can only ensure that one side of the same side of the positive electrode plate 120 and the negative electrode plate 130 is on the base material line, and there is a possibility that the negative electrode plate cannot wrap the positive electrode plate with the required phase difference.

[0034] For this reason, referring to Figure 2 , this embodiment provides a method for correcting the deviation of the pole pieces of the core, including the following steps:

[0035] S1. Arrange a detection device 300 at the winding station. The detection device 300 is mainly a CCD camera. The CCD camera records the edges of the positive electrode plate 120 and the negative electrode plate 130 through shooting. It should be noted that the CCD camera can be set at a position close to the winding station and the distance between the winding station and the camera is set so that the entire winding station can be presented within the field of view of the camera. The CCD camera can be controlled by the control system to capture the image to be measured.

[0036] S2. Detect the phase difference a between the tab side edge of the positive electrode plate 120 and the tab side edge of the negative electrode plate 130;

[0037] S3. Detect the phase difference b between the non-tab side edge of the positive electrode plate 120 and the non-tab side edge of the negative electrode plate 130; The tab side refers to the side where the tab is provided, and the non-tab side refers to the side that does not include the tab. The non-tab side and the tab side are located on opposite sides of the pole piece.

[0038] S4. Calculate the phase difference difference between the phase difference a and the phase difference b and record it as c, and feedback the absolute value of the phase difference difference c to the deviation correction mechanism;

[0039] S5. Perform rectification to control the phase difference difference c within the preset requirement range.

[0040] By detecting the phase differences of the ear side edge and the non-ear side edge of the positive electrode sheet 120 and the negative electrode sheet 130 and calculating the difference c between the two phase differences, and feeding back the difference c to the rectification mechanism to perform rectification actions to control the phase difference difference c within the preset requirement range. Considering both the phase difference a on the ear side and the phase difference b on the non-ear side, the probability that the negative electrode sheet 130 wraps the positive electrode sheet 120 is greatly increased, and the rectification is balanced, thereby improving the process yield and achieving the effect of cost reduction.

[0041] There are multiple ways to choose for the rectification method in step S5. One way is that if the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, move the positive electrode sheet 120 towards the ear side to make the phase difference difference c return to the preset requirement range. Relative to the position of the winding needle 200, the positive electrode sheet 120 is located outside the negative electrode sheet 130, and the offset amplitude is easy to detect. Moreover, by only controlling the movement of the positive electrode sheet 120, the control logic is simple, and the movement error can be reduced.

[0042] It can be understood that another rectification method is that if the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, move the negative electrode sheet 130 towards the non-ear side to make the phase difference difference c return to the preset requirement range. Similarly, by only controlling the movement of the negative electrode sheet 130, the control logic is simple, and the movement error can be reduced. Moreover, according to the manufacturing requirements of the power battery, the negative electrode sheet 130 needs to wrap the positive electrode sheet 120. Therefore, in the case of no pole piece offset, the edge of the negative electrode sheet 130 exceeds the edge of the positive electrode sheet 120 and can be clearly detected.

[0043] The most preferred rectification method is that if the absolute value of the phase difference difference c exceeds the preset requirement range and c is positive, move the positive electrode sheet 120 towards the ear side and move the negative electrode sheet 130 towards the non-ear side at the same time to make the phase difference difference c return to the preset requirement range. Moving the positive electrode sheet 120 and the negative electrode sheet 130 at the same time is to average the rectification amount and avoid excessive rectification amounts of the negative electrode sheet 130 or the positive electrode sheet 120, resulting in phenomena such as pole piece wrinkling and tape breakage.

[0044] Furthermore, move the positive electrode sheet towards the ear side by c / 4 and move the negative electrode sheet towards the non-ear side by c / 4 to obtain the rectified phase difference difference c' = 0. When the c' value is close to or equal to 0, the phase differences on the ear side and the non-ear side can make full use of the fluctuations of the incoming material, clearly identify the situation of the incoming material edge, and timely identify phenomena such as wrinkling and tape breakage.

[0045] It should be noted that the deviation rectification mechanism is usually equipped with high-precision sensors, such as CCD image sensors or edge detection sensors, for real-time monitoring of the position and deviation of the electrode sheet. These sensors can quickly capture the edge position of the electrode sheet and transmit the data to the controller. The controller is the core component of the deviation rectification mechanism. It receives the signals from the sensors, analyzes and processes them, and then issues instructions to adjust the position of the electrode sheet. The actuator makes physical adjustments according to the instructions of the controller. Common actuators include deviation rectification rollers driven by motors, cylinders or hydraulic cylinders. These actuators can achieve the lateral movement or angular adjustment of the electrode sheet to ensure that the electrode sheet always maintains the correct position during the winding process.

[0046] In some embodiments, as Figure 3 shown, before winding, a material line L1 is set at the edge of the non-tab side of the positive electrode sheet, and a material line L3 is set at the edge of the tab side; a material line L2 is set at the edge of the non-tab side of the negative electrode sheet, and a material line L4 is set at the edge of the tab side; the distance between the material line L1 and the material line L2 is detected, and the distance between the material line L3 and the material line L4 is detected. The phase difference on the tab side is judged by the distance between the material line L1 and the material line L2, and the phase difference on the non-tab side is judged by the distance between the material line L3 and the material line L4.

[0047] Furthermore, the distance between the material line L1 and the material line L2 is detected at multiple points on the edge of the tab side and averaged to obtain the phase difference a, and the distance between the material line L3 and the material line L4 is detected at multiple points on the edge of the non-tab side and averaged to obtain the phase difference b. The method of detecting at multiple points and averaging can improve the reliability of the data and avoid detection errors caused by single-point detection. Multiple-point detection can arrange multiple CCD cameras at the corresponding positions of the material line, splice the detected pictures, so as to timely detect the wrinkling and bending phenomena of the electrode sheet.

[0048] Another aspect of the present application provides a winding core electrode sheet deviation rectification system, including

[0049] a detection device 300, arranged corresponding to the winding station, for detecting the phase difference on the tab side edge and the non-tab side edge of the positive electrode sheet and the negative electrode sheet. The detection device uses a CCD camera to detect the position of the electrode sheet edge in real time through images.

[0050] a calculation module, electrically connected to the detection device, for calculating the difference between the phase difference on the tab side edge and the phase difference on the non-tab side edge. The calculation module sends the difference of the phase difference to the deviation rectification mechanism, and the deviation rectification mechanism performs the deviation rectification action.

[0051] a deviation rectification mechanism, receiving the difference signal of the phase difference fed back by the calculation module and performing the electrode sheet deviation rectification action. The deviation rectification mechanism includes a controller and an actuator. The controller receives the signals from the detection device and the calculation module and controls the actuator to perform physical deviation rectification actions.

[0052] The present application also provides a computer-readable storage medium for storing a program, which when executed implements the steps of the above-mentioned method for correcting the core pole piece.

[0053] On the other hand, the present application provides an electronic device, including: a processor; and a memory storing executable instructions of the processor. Wherein, the processor is configured to execute the steps of the above-mentioned method for correcting the core pole piece by executing the executable instructions.

[0054] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0056] The protection scope of the present invention is only defined by the claims. Benefiting from the teachings of the present invention, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A method for correcting the deviation of a winding core pole piece, characterized in that: The following steps are involved: S1. Arrange a detection device at the winding station; S2, detecting a phase difference a between the edge of the tab side of the positive electrode sheet and the edge of the tab side of the negative electrode sheet; S3, detecting a phase difference b between the non-ear side edge of the positive electrode sheet and the non-ear side edge of the negative electrode sheet; S4, calculating the phase difference between the phase difference a and the phase difference b, recording it as c, and feeding back the absolute value of the phase difference c to the deviation correction mechanism; S5. Execute deviation correction to control the phase difference c within a preset required range.

2. A winding core pole piece correction method according to claim 1, characterized in that: If the absolute value of the phase difference c exceeds the preset required range and c is a positive value, the positive electrode sheet is corrected and moved toward the pole ear side to make the phase difference c return to the preset required range.

3. A winding core pole piece correction method according to claim 1, characterized in that: If the absolute value of the phase difference c exceeds the preset required range and c is a positive value, the negative electrode sheet is corrected and moved toward the non-ear side to make the phase difference c return to the preset required range.

4. A winding core pole piece correction method according to claim 1, characterized in that: If the absolute value of the phase difference c exceeds the preset requirement range and c is a positive value, the positive electrode sheet is corrected and moved toward the pole ear side, and the negative electrode sheet is corrected and moved toward the non-pole ear side, so that the phase difference c returns to the preset requirement range.

5. A winding core pole piece correction method according to claim 4, characterized in that: The positive electrode sheet is corrected and moved toward the tab side by c / 4, and the negative electrode sheet is corrected and moved toward the non-tab side by c / 4, and the phase difference after correction is obtained as c'=0.

6. A winding core pole piece correction method according to claim 1, characterized in that: Before winding, set material line L1 at the edge of the non-ear side of the positive electrode sheet, and set material line L3 at the edge of the ear side; set material line L2 at the edge of the non-ear side of the negative electrode sheet, and set material line L4 at the edge of the ear side; detect the spacing between material line L1 and material line L2, and detect the spacing between material line L3 and material line L4.

7. A winding core pole piece correction method according to claim 6, characterized in that: The distance between material line L1 and material line L2 is detected at multiple points on the edge of the pole ear side and the average is calculated to obtain the phase difference a. The distance between material line L3 and material line L4 is detected at multiple points on the edge of the non-pole ear side and the average is calculated to obtain the phase difference b.

8. A winding core pole piece correction system, characterized in that: include A detection device is provided corresponding to the winding station, and is used to detect the phase difference between the edge of the positive electrode sheet and the negative electrode sheet on the side of the pole ear, and the phase difference between the edge of the non-pole ear; A calculation module, electrically connected to the detection device, for calculating the difference between the phase difference of the edge of the pole ear side and the phase difference of the edge of the non-pole ear side; The correction mechanism receives the phase difference difference signal fed back by the calculation module and performs the pole piece correction action.

9. A computer-readable storage medium for storing a program, characterized in that: When the program is executed, the steps of the winding core pole piece correction method described in any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: include: processor; A memory storing executable instructions of the processor; Wherein, the processor is configured to execute the steps of the winding core pole piece correction method described in any one of claims 1-7 by executing the executable instructions.

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