CN117913340A

CN117913340A - Tab dislocation detection and correction method, device and system

Info

Publication number: CN117913340A
Application number: CN202311855762.5A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Wuxi Lead Intelligent Equipment Co Ltd
Current assignee: Wuxi Lead Intelligent Equipment Co Ltd
Priority date: 2023-12-29
Filing date: 2023-12-29
Publication date: 2024-04-19

Abstract

The application relates to a method, a device and a system for detecting and correcting tab dislocation, wherein the method comprises the following steps: acquiring a first tab image and a second tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process; the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished; and analyzing based on the first tab image and the second tab image, determining the tab dislocation type and the relative dislocation amount of the battery cell to be measured, and finally adjusting the working parameters of the battery cell winding equipment based on the tab dislocation state. In the whole process, the first tab image and the second tab image are analyzed, the tab dislocation state is accurately identified, and the working parameters of the battery cell winding equipment are correspondingly adjusted according to different tab dislocation states, so that the tab dislocation of battery cell winding can be effectively eliminated.

Description

Tab dislocation detection and correction method, device and system

Technical Field

The present application relates to the field of tab misalignment detection technology, and in particular, to a tab misalignment detection and correction method, apparatus, system, computer device, storage medium, and computer program product.

Background

Tab misalignment is a problem that requires attention during battery manufacturing. The tab is a critical component inside the battery and is responsible for collecting and transferring current. If the tabs are dislocated, the battery performance may be degraded and even safety problems may occur.

The causes of the tab misalignment may include various factors in the manufacturing process, such as pole piece size, winding tension, equipment accuracy, etc. In order to solve this problem, conventionally taken measures mainly include: 1. attaching teflon to the winding needle to increase the diameter of the winding needle; however, the method needs to be debugged with abundant experience, otherwise, multiple trial and error are needed to be performed, and the debugging can be performed; 2. adjusting the pressure of the P roller; but this increases the risk of membrane wrinkling, pole piece wrinkling; 3. adjusting the lug spacing at the die cutting position; however, in order to avoid the dislocation of the tabs, the process of changing the spacing between the tabs may affect the quality of the battery cells.

As can be seen, there is no effective tab misalignment detection correction scheme in the conventional art.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an effective tab misalignment detection and correction method, apparatus, system, computer device, storage medium, and computer program product.

In a first aspect, the application provides a tab misalignment detection and correction method. The method comprises the following steps:

Acquiring a first tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process;

acquiring a second lug image of battery cell winding, wherein the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished;

Determining a tab dislocation state of the battery cell to be tested according to the first tab image and the second tab image, wherein the tab dislocation state comprises a tab dislocation type and a relative dislocation amount;

And adjusting working parameters of the battery core winding equipment based on the dislocation state of the electrode lugs.

In one embodiment, the determining, according to the first tab image and the second tab image, a tab misalignment state of the to-be-measured electrical core includes:

based on the image of each layer of tab and any one of the selected first tab images, calculating to obtain a plurality of groups of relative dislocation amounts corresponding to the ith layer of tab;

or, based on the second-layer tab image and the first-layer tab image, calculating to obtain the total relative dislocation amount of the tabs in the winding process;

And analyzing the relative dislocation quantity corresponding to the ith layer of lugs or the total relative dislocation quantity of the lugs to determine the lug dislocation type of the battery cell to be tested.

In one embodiment, the analyzing the relative misalignment amounts of the multiple groups of tabs corresponding to the ith layer, and determining the tab misalignment type of the to-be-measured battery cell includes:

Performing data fitting on the plurality of groups of relative dislocation amounts corresponding to the ith layer of lugs to obtain a data fitting curve;

And determining the dislocation type of the electrode lugs of the battery cell to be tested based on the data fitting curve.

In one embodiment, the tab misalignment type includes a first misalignment type, a second misalignment type, and a third misalignment type;

the first dislocation type is a dislocation type with equal relative dislocation amount of two adjacent layers of lugs, and the second dislocation type is a dislocation type with the relative dislocation amount of the lugs increasing along with the increase of the winding layer number; the third dislocation type is a dislocation type that the relative dislocation amount of the tab increases with the number of winding layers and decreases after the increase.

In one embodiment, each misalignment type includes at least one of two tab orientation subtypes, respectively, the tab orientation subtype including: the anode-oriented dislocation and the cathode-oriented dislocation are of the dislocation type of the electrode lug facing the anode in the second-layer electrode lug image, and the cathode-oriented dislocation is of the dislocation type of the electrode lug facing the cathode in the second-layer electrode lug image.

In one embodiment, the adjusting the working parameters of the cell winding device based on the tab misalignment state includes:

The tab dislocation type is a third dislocation type, and the working parameters of the battery core winding equipment are adjusted so that the tab dislocation type is changed from the third dislocation type to any one of the first dislocation type or the second dislocation type;

And adjusting working parameters of the battery cell winding equipment aiming at the first dislocation type or the second dislocation type to eliminate dislocation of the tab.

In one embodiment, the adjusting the working parameter of the electrical core winding device to change the tab dislocation type from the third dislocation type to any one of the first dislocation type or the second dislocation type includes:

And adjusting the circumference of a winding needle in the battery core winding equipment or the pressure value of a pressure roller in the battery core winding equipment so as to change the tab dislocation type from the third dislocation type to any one of the first dislocation type and the second dislocation type.

The electrode lug dislocation type is a third dislocation type, the relative dislocation quantity of each layer of electrode lug is analyzed, and inflection point data of a k layer of electrode lug with the relative dislocation quantity being increased and then reduced is determined;

and respectively calculating an adjusting value for adjusting the circumference of a winding needle of the battery core winding equipment and the pressure roller pressure correction value required for eliminating the third dislocation type based on the inflection point data of the k-th layer tab.

The tab dislocation type is a first dislocation type, and the circumference of a winding needle in the battery cell winding equipment is increased or decreased by a certain value based on the relative dislocation amount corresponding to the first dislocation type.

In one embodiment, the first dislocation type includes a first dislocation type to an anode and a first dislocation type to a cathode, wherein the first dislocation type to the anode is that a tab in the second-layer tab image faces the anode, and the second dislocation type to the cathode is that a tab in the second-layer tab image faces the cathode;

Based on the tab dislocation state, the adjusting working parameters of the battery core winding equipment comprises the following steps:

The electrode lug dislocation type is a first dislocation type of an anode, and the circumference of a winding needle in the battery core winding equipment is increased;

the electrode lug dislocation type is a first dislocation type towards a cathode, and the circumference of a winding needle in the battery cell winding equipment is reduced.

the electrode lug dislocation type is a second dislocation type, and the pressure value of the pressure roller in the battery core winding equipment is increased or decreased by a certain value based on the relative dislocation amount corresponding to the second dislocation type.

In one embodiment, the second dislocation type includes an anode-facing second dislocation type and a cathode-facing second dislocation type, wherein the anode-facing dislocation is that the tab in the second-layer tab image faces the anode, and the cathode-facing dislocation is that the tab in the second-layer tab image faces the cathode;

the electrode lug dislocation type is a second dislocation type of the positive electrode, and the pressure value of a pressure roller in the battery cell winding equipment is increased;

The electrode lug dislocation type is a second dislocation type towards a cathode, and the pressure value of a pressure roller in the battery cell winding equipment is reduced.

In a second aspect, the application further provides a tab misalignment detection and correction device. The device comprises:

The first image acquisition module is used for acquiring a first tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process;

The second image acquisition module is used for acquiring a second lug image of the battery cell winding, wherein the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished;

The detection module is used for determining the electrode lug dislocation state of the battery cell to be detected according to the first electrode lug image and the second electrode lug image, wherein the electrode lug dislocation state comprises an electrode lug dislocation type and a relative dislocation amount;

and the correction module is used for adjusting working parameters of the battery core winding equipment based on the tab dislocation state.

In a third aspect, the application further provides a tab misalignment detection and correction system. The system comprises image acquisition equipment and a controller, wherein the image acquisition equipment acquires images of each layer of tab in the winding process of the battery core, and sends the images of each layer of tab to the controller, and the controller adjusts working parameters of the battery core winding equipment by adopting the tab dislocation detection and correction method.

In a fourth aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:

In a fifth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:

In a sixth aspect, the application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:

The tab misalignment detection and correction method, the device, the system, the computer equipment, the storage medium and the computer program product acquire a first tab image and a second tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process; the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished; and analyzing based on the first tab image and the second tab image, determining the tab dislocation type and the relative dislocation amount of the battery cell to be measured, and finally adjusting the working parameters of the battery cell winding equipment based on the tab dislocation state. In the whole process, the first tab image and the second tab image are analyzed, the tab dislocation state is accurately identified, and the working parameters of the battery cell winding equipment are correspondingly adjusted according to different tab dislocation states, so that the tab dislocation of battery cell winding can be effectively eliminated.

Drawings

FIG. 1 is an application environment diagram of a tab misalignment detection correction method in one embodiment;

FIG. 2 is a schematic flow chart of a method for detecting and correcting tab misalignment in an embodiment;

FIG. 3 is a schematic diagram of different lug dislocation types in one embodiment;

FIG. 4 is a schematic diagram of relative misalignment of tabs in one embodiment;

FIG. 5 is a schematic diagram of different lug dislocation types in another embodiment;

FIG. 6 is a flowchart of a tab misalignment detection and correction method according to another embodiment;

FIG. 7 is a flowchart of a method for detecting and correcting tab misalignment according to another embodiment;

FIG. 8 is a schematic diagram of a tab misalignment detection and correction system in an embodiment;

FIG. 9 is a schematic structural diagram of a tab misalignment detection and correction apparatus according to an embodiment;

fig. 10 is an internal structural view of a computer device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The tab misalignment detection and correction method provided by the embodiment of the application can be applied to an application environment as shown in fig. 1. Wherein the controller 102 is connected to the cell winding device 104, and the controller 102 adjusts the operating parameters of the cell winding device 104. The battery cell winding device 104 winds the pole piece to generate a battery cell, in the process, the image acquisition device 106 acquires an image of a pole lug in the process of winding the battery cell and sends the image of the pole lug in the process of winding the battery cell to the controller 102, and the controller 102 acquires a first pole lug image and a second pole lug image of the battery cell winding based on the image sent by the image acquisition device 106, wherein the first pole lug image comprises at least one of a first layer pole lug image formed after winding starts, a preset measurement reference image or an image of an ith layer pole lug in the process of winding; the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished; determining a tab dislocation state of the battery cell to be tested according to the first tab image and the second tab image, wherein the tab dislocation state comprises a tab dislocation type and a relative dislocation amount; based on the tab misalignment state, the operating parameters of the cell winding device 104 are adjusted.

In one embodiment, as shown in fig. 2, a tab misalignment detection and correction method is provided, and the method is applied to the controller 102 in fig. 1 for illustration, and includes the following steps:

S200: the method comprises the steps of acquiring a first tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process.

In the process of winding the battery cell, the positive and negative electrode plates and the diaphragm are wound together to form winding cores, and positive and negative current collectors can leak out from two sides of each winding core, namely the so-called tabs, and the number and the positions of the tabs are determined according to the design of the battery. The image in the process of winding the battery cell can be acquired by a CCD (charge coupled DEVICE CAMERA) camera. The controller firstly acquires a first tab image of the battery core winding, wherein the first tab image comprises at least one of a first layer tab image formed after the winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process. The first layer tab image refers to a first layer tab image formed after the winding of the battery cell starts, that is, the first layer tab image formed after the winding of the whole battery cell starts; the preset measurement reference image is a preset reference image and is used for comparing with each layer of tab image actually acquired in the process of winding the battery cell so as to realize tab dislocation correction; the image of the ith layer of tab in the winding process refers to any layer of tab image in the battery core winding process, for example, the image of the 10 th layer of tab, the image of the 15 th layer of tab and the like.

S400: and acquiring a second lug image of the battery core winding, wherein the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished.

The controller also acquires a second tab image of the winding of the battery cell, wherein the second tab image comprises at least one of an image of each layer of tab in the winding process or a second layer of tab image formed before the winding is finished, and the second layer of tab image formed before the winding is finished refers to a corresponding last layer of tab image when the winding of the whole battery cell is finished.

S600: and determining the electrode lug dislocation state of the battery core to be tested according to the first electrode lug image and the second electrode lug image, wherein the electrode lug dislocation state comprises the electrode lug dislocation type and the relative dislocation amount.

During the winding process of the battery cell, the dislocation of the tab is a common problem. Tab misalignment is typically caused by the pole pieces not being aligned or wrinkling during winding. The tab misalignment state includes two dimensions of tab misalignment type and tab misalignment amount. Here, the tab dislocation state of the battery cell to be measured can be determined by analyzing the first tab image and the second tab image. Taking a first tab image as a first layer tab image and a second tab image as a second layer tab image as examples, determining the tab dislocation type and the relative dislocation amount of the battery core to be measured by analyzing the first layer tab image and the last layer tab image of the battery core winding. Further, the tab dislocation types may include a first dislocation type, a second dislocation type and a third dislocation type, specifically, as shown in fig. 3, the first dislocation type is a dislocation type with equal relative dislocation amount of two adjacent layers of tabs, and the second dislocation type is a dislocation type with the relative dislocation amount of the tabs increasing with the increase of the winding layer number; the third dislocation type is a dislocation type that the relative dislocation amount of the tab increases with the number of winding layers and decreases after increasing. In practical application, the first dislocation type may be simply referred to as equivalent dislocation; the second dislocation type is simply referred to as progressive dislocation; the third dislocation type may be simply referred to as a U-dislocation.

S800: based on the dislocation state of the electrode lugs, the working parameters of the battery core winding equipment are adjusted.

The reason for causing the dislocation of the tab can be further analyzed through the tab dislocation state, and further the working parameters of the battery cell winding equipment are adjusted so as to gradually eliminate the tab dislocation of the battery cell winding. Specifically, the circumference of the winding needle and/or the pressure of the pressure roller of the cell winding device can be adjusted to eliminate the dislocation of the tab wound by the cell. Furthermore, the adjustment modes corresponding to the dislocation states of the different tabs can be obtained through historical data analysis, and the working parameters of the battery cell winding equipment can be adjusted in a targeted manner based on the recognized dislocation states of the tabs in the actual production operation process, so that the dislocation of the tabs of the battery cell winding is eliminated accurately.

According to the tab dislocation detection and correction method, the first tab image and the second tab image of the battery core winding are obtained, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process; the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished; and analyzing based on the first tab image and the second tab image, determining the tab dislocation type and the relative dislocation amount of the battery cell to be measured, and finally adjusting the working parameters of the battery cell winding equipment based on the tab dislocation state. In the whole process, the first tab image and the second tab image are analyzed, the tab dislocation state is accurately identified, and the working parameters of the battery cell winding equipment are correspondingly adjusted according to different tab dislocation states, so that the tab dislocation of battery cell winding can be effectively eliminated.

In one embodiment, determining the tab misalignment state of the to-be-measured cell according to the first tab image and the second tab image includes:

based on the image of each layer of tab and any one selected first tab image, calculating to obtain a plurality of groups of relative dislocation amounts corresponding to the ith layer of tab;

And analyzing a plurality of groups of relative dislocation amounts corresponding to the ith layer of lugs or total relative dislocation amounts of the lugs, and determining the lug dislocation type of the battery cell to be tested.

And calculating each layer of tab image and the reference (the first tab image) by taking the first tab image as the reference to obtain a plurality of groups of relative dislocation amounts corresponding to the ith layer of tab. In practical application, the image of the ith layer of tab in the process of winding the battery cell can be used as a reference, or the image of each layer of tab is used as a reference, each layer of tab image is compared with a selected reference, the relative dislocation amount among a plurality of groups of tab images of different layers is obtained through calculation, and further, the dislocation amount of each layer of tab image can be obtained through calculation aiming at each layer. In addition, in this embodiment, the total relative misalignment amount of the tabs in the winding process may also be calculated based on the second-layer tab image and the first-layer tab image in the winding process of the battery cell. As described above, the second-layer tab image refers to a tab image formed before the winding of the battery cell is completed, which can be understood as the last-layer tab image; the first layer tab image refers to a tab image formed when the battery core is wound, namely, the final layer tab image of the battery core wound and the tab image formed at the beginning are subjected to comparison analysis to obtain the total relative dislocation quantity of the tabs. And after obtaining the dislocation amount of each layer of tab image or the total relative dislocation amount of the tabs, carrying out data analysis to determine the tab dislocation type of the battery cell to be tested.

In one embodiment, analyzing the relative dislocation amounts of the multiple groups of tabs corresponding to the ith layer, and determining the tab dislocation type of the to-be-measured battery cell includes:

performing data fitting on a plurality of groups of relative dislocation amounts corresponding to the ith layer of tab to obtain a data fitting curve; and determining the dislocation type of the electrode lugs of the battery cell to be tested based on the data fitting curve.

In particular, the data fitting may be performed in a variety of ways, such as linear fitting, polynomial fitting, and the like. And fitting the relative dislocation amounts corresponding to the ith layer of tab together by adopting the fitting mode to obtain a data fitting curve, wherein the obtained fitting curve can be specifically shown in figure 4. The data fitting curves corresponding to different tab dislocation types are different, so that the tab dislocation type of the battery cell to be measured can be determined based on the data fitting curves. Continuing with fig. 4 as an example, in fig. 4, the relative dislocation amounts of two adjacent layers of tabs are almost equal, that is, based on the data fitting curve shown in fig. 4, it can be analyzed that the tab dislocation type is the first dislocation type (equal dislocation).

In one embodiment, each dislocation type includes at least one of two tab orientation subtypes, respectively, the tab orientation subtype including: the anode and cathode are dislocated, the electrode lug is dislocated towards the anode in the second layer electrode lug image, and the cathode is dislocated towards the cathode in the second layer electrode lug image.

Each dislocation type comprises at least one of two tab orientation sub-types, wherein the tab orientation sub-types specifically comprise anode orientation dislocation and cathode orientation dislocation, the anode orientation and the cathode orientation specifically refer to the orientation of the tab in a second-layer tab image formed before the winding of the battery cell is finished, and if the tab is oriented to the anode, the tab is oriented to the anode; if the tab is directed toward the cathode, it is displaced toward the cathode. Corresponding to the above, as shown in fig. 5, the first misalignment type includes a first misalignment type toward the anode and a first misalignment type toward the cathode; the second dislocation type includes a second dislocation type to the anode and a second dislocation type to the cathode; the third dislocation type includes a third dislocation type to the anode and a third dislocation type to the cathode.

As shown in fig. 6, in one embodiment, S800 includes:

S810: the tab dislocation type is a third dislocation type, and the working parameters of the battery core winding equipment are adjusted so that the tab dislocation type is changed from the third dislocation type to any one of the first dislocation type or the second dislocation type;

S820: aiming at the first dislocation type or the second dislocation type, the working parameters of the battery core winding equipment are adjusted, and the dislocation of the electrode lugs is eliminated.

The third dislocation type is a dislocation type that the relative dislocation amount of the tab increases with the number of winding layers and then decreases, and aiming at the situation that the dislocation type of the tab is the third dislocation type, the working parameters of the battery core winding device are adjusted firstly so that the dislocation type of the tab is changed from the third dislocation type to the first dislocation type or the second dislocation type, and then the working parameters of the battery core winding device are adjusted again in a mode of eliminating the first dislocation type or the second dislocation type, so that the dislocation of the tab is eliminated finally. In particular, the adjustment of the operating parameters of the cell winding device mainly comprises adjustment of the circumference of the winding needle and/or the pressure value of the pressure roller in the cell winding device, and the circumference of the winding needle can be specifically the diameter of the winding needle and/or the length of the winding needle. The pressure value of the pressure roller in the cell winding device refers to the pressure exerted by the pressure roller on the cell during the winding process. This pressure value has a significant impact on the winding quality and performance of the cells. The main function of the pressure roller is to keep the battery cell compact and stable in the winding process and prevent the battery cell from loosening or shifting. The proper pressure value can ensure that the battery cell is well compacted and shaped in the winding process, so that the energy density and the cycle life of the battery cell are improved. However, if the pressure value of the pressure roller is improperly set, damage to the battery cell may be caused. Too large a pressure value may cause deformation, uneven thickness or damaged internal structure of the battery cell, while too small a pressure value may not be capable of effectively compacting the battery cell, resulting in loose battery cell or occurrence of dislocation of tabs and the like.

In practical application, for the case of the third dislocation type, the third dislocation type (U-dislocation) is replaced with the single-side dislocation of the first dislocation type (equivalent dislocation) or the second dislocation type (progressive dislocation), and then the tab dislocation is eliminated in a manner of eliminating the single-side dislocation. Further, specifically, the circumference of the winding needle in the cell winding device or the pressure value of the pressure roller in the cell winding device can be adjusted, so that the tab dislocation type is changed from the third dislocation type to any one of the first dislocation type and the second dislocation type.

As shown in fig. 7, in one embodiment, S800 includes:

S830: the electrode lug dislocation type is a third dislocation type, the relative dislocation quantity of each layer of electrode lug is analyzed, and inflection point data of a k layer of electrode lug with the relative dislocation quantity increased and then reduced is determined;

S840: and respectively calculating an adjusting value for adjusting the circumference of a winding needle of the battery core winding equipment and a pressure roller pressure correction value required for eliminating the third dislocation type based on inflection point data of the k-th layer tab.

In this embodiment, for the case that the tab misalignment type is the third misalignment type, inflection point data of a kth layer tab with a relative misalignment amount that increases and decreases first is further analyzed, a corresponding kth layer tab with a relative misalignment amount that increases and decreases first in tab misalignment is analyzed, and then data of the relative misalignment amount corresponding to the kth layer tab is analyzed as inflection point data. After the inflection point data is obtained, working parameters of the battery cell winding equipment which are required to be adjusted for eliminating the dislocation corresponding to the inflection point data are further analyzed and calculated, namely an adjusting value and a pressure roller pressure correction value for adjusting the circumference of a winding needle of the battery cell winding equipment which are required to be adjusted for eliminating a third dislocation type are respectively calculated, and after the correction value is input into the battery cell winding equipment, the dislocation of the tab of the third dislocation type can be corrected.

In one embodiment, adjusting the operating parameters of the cell winding device based on the tab misalignment state includes:

The electrode lug dislocation type is a first dislocation type, and the circumference of a winding needle in the battery cell winding equipment is increased or decreased by a certain value based on the relative dislocation amount corresponding to the first dislocation type.

For the case that the tab dislocation type is the first dislocation type (equivalent dislocation). According to historical data analysis, the first dislocation type is mainly caused by unreasonable circumference of the winding needle (including the length and/or the diameter of the winding needle) in the battery cell winding equipment, so that the circumference of the winding needle in the battery cell winding equipment can be directly adjusted to eliminate dislocation of the tab wound by the battery cell. Further, the specific adjustment amount may be determined based on the total amount of misalignment corresponding to the first type of misalignment. Specifically, the corresponding relation between the total dislocation amount and the circumference of the winding needle under the first dislocation type can be obtained based on test data analysis, and then the circumference of the winding needle in the battery cell winding equipment is adjusted in a targeted manner so as to eliminate the dislocation of the tab wound by the battery cell.

In addition, the first dislocation type includes a directional anode first dislocation type and a directional cathode first dislocation type. If the first dislocation type to the anode is adopted, the circumference of a winding needle in the battery core winding equipment is increased so as to eliminate the dislocation of a tab wound by the battery core, and the length and/or the diameter of the winding needle can be increased; if the first dislocation type to the cathode is adopted, the circumference of the winding needle in the cell winding equipment is reduced so as to eliminate the dislocation of the tab wound by the cell, and the length and/or the diameter of the winding needle can be reduced.

In one embodiment, adjusting the operating parameters of the cell winding device based on the tab misalignment state includes: the electrode lug dislocation type is a second dislocation type, and the pressure value of the pressure roller in the battery cell winding equipment is increased or decreased by a certain value based on the relative dislocation amount corresponding to the second dislocation type.

The tab misalignment type may also be a second misalignment type (progressive misalignment). According to historical data analysis, the second dislocation type is mainly caused by unreasonable pressure value of the pressure roller in the battery cell winding equipment, so that the pressure value of the pressure roller in the battery cell winding equipment can be directly adjusted to eliminate dislocation of the tab wound by the battery cell. Further, the specific adjustment amount may be determined based on the total amount of misalignment corresponding to the progressive misalignment. Specifically, the corresponding relation between the total dislocation amount and the pressure value of the pressure roller under the second dislocation type can be obtained based on test data analysis, and then the pressure value of the pressure roller in the cell winding equipment is adjusted in a targeted mode so as to eliminate the dislocation of the electrode lugs of the cell winding.

Further, the second dislocation type includes a second dislocation type to the anode and a second dislocation type to the cathode. If the positive electrode is of the second dislocation type, increasing the pressure value of a pressure roller in the battery core winding equipment so as to eliminate dislocation of the electrode lugs wound by the battery core; and if the second dislocation type is the cathode, reducing the pressure value of a pressure roller in the cell winding equipment so as to eliminate the dislocation of the tab wound by the cell.

As shown in fig. 8, in a specific application example, the entire tab misalignment detection correction system includes a CCD camera, a controller, a cell winding device, and the like. The battery core winding equipment starts to work, the CCD camera is aligned to the position of the lug to collect an image, the image is sent to the controller, and the controller analyzes the image to obtain the position distribution data of the lug; and identifying and classifying the dislocation types, calculating the dislocation quantity of the tabs and the total dislocation quantity of the tabs according to data distribution and AI analysis, and adjusting working parameters of the battery cell winding equipment by the controller according to the dislocation types of the tabs, the dislocation quantity of the tabs and the total dislocation quantity of the tabs. The specific adjustment is as follows:

(1) First dislocation type (equivalent dislocation) -positive electrode: the equivalent misalignment is generally caused by the diameter deviation of the winding needle of the battery core, and the positive electrode equivalent misalignment can increase the circumference of the winding needle (increase the length and/or the diameter of the winding needle) to correct the misalignment.

(2) First dislocation type (equivalent dislocation) -cathodic: the equivalent misalignment is generally caused by the diameter deviation of the winding needle of the battery core, and the equivalent misalignment towards the cathode can reduce the circumference of the winding needle (reduce the length and/or the diameter of the winding needle) to correct the misalignment.

(3) Second dislocation type (progressive dislocation) -positive electrode: progressive misalignment is typically caused by cell material thickness deviations, and progressive misalignment toward the anode can increase the pressure value of the pressure roller to correct the misalignment.

(4) Second dislocation type (progressive dislocation) -cathodic: progressive misalignment is typically caused by cell material thickness deviations, and progressive misalignment toward the cathode can reduce the pressure value of the pressure roller to correct the misalignment.

(5) Third dislocation type (U-dislocation) -positive electrode: the U-shaped dislocation is caused by the combination of the equal dislocation and the progressive dislocation, the pressure value of the pressure roller can be increased to single-side dislocation (the first dislocation type or the second dislocation type) at first, and then the U-shaped dislocation is adjusted according to single-side dislocation classification.

(6) Third dislocation type (U-dislocation) -cathodic: the U-shaped dislocation is caused by the combination of the equal dislocation and the progressive dislocation, the pressure value of the pressure roller can be reduced to single-side dislocation to the cathode U-shaped dislocation, and then the single-side dislocation is classified and adjusted.

It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a tab misalignment detection and correction device for realizing the tab misalignment detection and correction method. The implementation scheme of the device for solving the problem is similar to that described in the above method, so the specific limitation of the embodiment of the device for detecting and correcting the tab misalignment provided in the following may be referred to the limitation of the method for detecting and correcting the tab misalignment hereinabove, and will not be repeated here.

As shown in FIG. 9, the application further provides a tab misalignment detection and correction device. The device comprises:

The first image acquisition module 200 is configured to acquire a first tab image of the battery core winding, where the first tab image includes at least one of a first layer tab image formed after the winding starts, a preset measurement reference image, or an image of an ith layer tab in the winding process;

A second image obtaining module 400, configured to obtain a second tab image of the battery core winding, where the second tab image includes at least one of an image of each layer of tab during the winding process or a second layer of tab image formed before the winding is completed;

the detection module 600 is configured to determine, according to the first tab image and the second tab image, a tab misalignment state of the to-be-detected battery cell, where the tab misalignment state includes a tab misalignment type and a relative misalignment amount;

The correction module 800 is configured to adjust an operating parameter of the cell winding device based on the tab misalignment state.

The tab dislocation detection and correction device acquires a first tab image and a second tab image of battery cell winding, wherein the first tab image comprises at least one of a first layer tab image formed after winding starts, a preset measurement reference image or an image of an ith layer tab in the winding process; the second lug image comprises at least one of an image of each layer of lug in the winding process or a second layer of lug image formed before the winding is finished; and analyzing based on the first tab image and the second tab image, determining the tab dislocation type and the relative dislocation amount of the battery cell to be measured, and finally adjusting the working parameters of the battery cell winding equipment based on the tab dislocation state. In the whole process, the first tab image and the second tab image are analyzed, the tab dislocation state is accurately identified, and the working parameters of the battery cell winding equipment are correspondingly adjusted according to different tab dislocation states, so that the tab dislocation of battery cell winding can be effectively eliminated.

In one embodiment, the detection module 600 is further configured to calculate, based on the image of each layer of tab and any one of the selected first tab images, a plurality of groups of relative misalignment amounts corresponding to the ith layer of tab; or, based on the second-layer tab image and the first-layer tab image, calculating to obtain the total relative dislocation amount of the tabs in the winding process; and analyzing a plurality of groups of relative dislocation amounts corresponding to the ith layer of lugs or total relative dislocation amounts of the lugs, and determining the lug dislocation type of the battery cell to be tested.

In one embodiment, the detection module 600 is further configured to perform data fitting on a plurality of groups of relative misalignment amounts corresponding to the ith layer of tab, so as to obtain a data fitting curve; and determining the dislocation type of the electrode lugs of the battery cell to be tested based on the data fitting curve.

In one embodiment, the tab misalignment types include a first misalignment type, a second misalignment type, and a third misalignment type; the first dislocation type is a dislocation type with equal relative dislocation amount of two adjacent layers of lugs, and the second dislocation type is a dislocation type with the relative dislocation amount of the lugs increasing along with the increase of the winding layer number; the third dislocation type is a dislocation type that the relative dislocation amount of the tab increases with the number of winding layers and decreases after increasing.

In one embodiment, the correction module 800 is further configured to adjust an operating parameter of the electrical core winding device when the tab misalignment type is the third misalignment type, so that the tab misalignment type is changed from the third misalignment type to either the first misalignment type or the second misalignment type; aiming at the first dislocation type or the second dislocation type, the working parameters of the battery core winding equipment are adjusted, and the dislocation of the electrode lugs is eliminated.

In one embodiment, the correction module 800 is further configured to adjust the circumference of the winding needle in the cell winding device or the pressure value of the pressure roller in the cell winding device, so that the tab misalignment type is changed from the third misalignment type to either the first misalignment type or the second misalignment type.

In one embodiment, the correction module 800 is further configured to analyze the relative misalignment amount of each layer of tab when the tab misalignment type is the third misalignment type, and determine inflection point data of the k layer of tab that the relative misalignment amount increases and decreases; and respectively calculating an adjusting value for adjusting the circumference of a winding needle of the battery core winding equipment and a pressure roller pressure correction value required for eliminating the third dislocation type based on inflection point data of the k-th layer tab.

In one embodiment, the correction module 800 is further configured to increase or decrease the circumference of the winding needle in the cell winding device by a certain value based on the relative misalignment amount corresponding to the first misalignment type when the tab misalignment type is the first misalignment type.

In one embodiment, the first dislocation type includes a first dislocation type towards the anode and a first dislocation type towards the cathode, wherein the first dislocation type towards the anode is a dislocation type of the tab facing the anode in the second-layer tab image, and the second dislocation type towards the cathode is a dislocation type of the tab facing the cathode in the second-layer tab image;

the correction module 800 is further configured to increase the circumference of the winding needle in the cell winding device when the tab misalignment type is the first misalignment type towards the anode; when the dislocation type of the tab is the first dislocation type towards the cathode, the circumference of a winding needle in the cell winding equipment is reduced.

In one embodiment, the correction module 800 is further configured to increase or decrease the pressure value of the pressure roller in the cell winding device by a certain value based on the relative misalignment amount corresponding to the second misalignment type when the tab misalignment type is the second misalignment type.

In one embodiment, the second dislocation type includes a second dislocation type towards the anode and a second dislocation type towards the cathode, wherein the second dislocation type towards the anode is a dislocation type towards the anode of the tab in the second-layer tab image, and the second dislocation type towards the cathode is a dislocation type towards the cathode of the tab in the second-layer tab image;

The correction module 800 is further configured to increase a pressure value of the pressure roller in the cell winding device when the tab misalignment type is the second misalignment type for the positive electrode; and when the dislocation type of the tab is the second dislocation type towards the cathode, reducing the pressure value of the pressure roller in the cell winding equipment.

All or part of each module in the tab dislocation detection and correction device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

The application also provides a tab dislocation detection and correction system. The system comprises image acquisition equipment and a controller, wherein the image acquisition equipment acquires images of each layer of tab in the winding process of the battery core and sends the images of each layer of tab to the controller, and the controller adjusts working parameters of the battery core winding equipment by adopting the tab dislocation detection and correction method so as to eliminate tab dislocation of battery core winding.

In one embodiment, a computer device is provided, which may be a terminal, and an internal structure diagram thereof may be as shown in fig. 10. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor is used for realizing a tab misalignment detection correction method.

In one embodiment, a computer device is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the tab misalignment detection correction method described above when executing the computer program.

In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the above-described tab misalignment detection correction method.

In one embodiment, a computer program product is provided, including a computer program that when executed by a processor implements the tab misalignment detection correction method described above.

The user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party.

Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high density embedded nonvolatile memory, resistive random access memory (ReRAM), magneto-resistive random access memory (Magnetoresistive RandomAccess Memory, MRAM), ferroelectric memory (Ferroelectric RandomAccess Memory, FRAM), phase change memory (PHASE CHANGE memory, PCM), graphene memory, and the like. Volatile memory can include random access memory (RandomAccess Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static RandomAccess Memory, SRAM) or dynamic random access memory (Dynamic RandomAccess Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. The utility model provides a tab dislocation detection correction method which is characterized in that the method includes:

2. The method of claim 1, wherein determining the tab misalignment state of the cell under test from the first tab image and the second tab image comprises:

3. The method of claim 2, wherein analyzing the plurality of groups of relative misalignment amounts corresponding to the ith layer of tabs, and determining the tab misalignment type of the to-be-measured cell comprises:

4. A method according to claim 2 or 3, wherein the tab misalignment types include a first misalignment type, a second misalignment type, and a third misalignment type;

5. The method of claim 4, wherein each misalignment type comprises at least one of two tab orientation subtypes, respectively, the tab orientation subtype comprising: the anode-oriented dislocation and the cathode-oriented dislocation are of the dislocation type of the electrode lug facing the anode in the second-layer electrode lug image, and the cathode-oriented dislocation is of the dislocation type of the electrode lug facing the cathode in the second-layer electrode lug image.

6. The method of claim 4, wherein adjusting the operating parameters of the cell winding device based on the tab misalignment state comprises:

7. The method of claim 6, wherein adjusting the operating parameters of the cell winding device to change the tab misalignment type from the third misalignment type to either the first misalignment type or the second misalignment type comprises:

8. The method of claim 4, wherein adjusting the operating parameters of the cell winding device based on the tab misalignment state comprises:

9. The method of claim 4, wherein adjusting the operating parameters of the cell winding device based on the tab misalignment state comprises:

10. The method of claim 9, wherein the first misalignment type comprises a first misalignment type to the anode and a first misalignment type to the cathode, the first misalignment to the anode being the tab in the second layer tab image facing the anode and the second misalignment to the cathode being the tab in the second layer tab image facing the cathode;

11. The method of claim 4, wherein adjusting the operating parameters of the cell winding device based on the tab misalignment state comprises:

12. The method of claim 11, wherein the second misalignment type comprises a second misalignment type to the anode and a second misalignment type to the cathode, the positive misalignment being the tab in the second layer tab image facing the anode and the negative misalignment being the tab in the second layer tab image facing the cathode;

13. A tab misalignment detection and correction apparatus, the apparatus comprising:

14. A tab misalignment detection and correction system, comprising an image acquisition device and a controller, wherein the image acquisition device acquires an image of each layer of tab during winding of a core, and sends the image of each layer of tab to the controller, and the controller adjusts the working parameters of the core winding device by adopting the steps of the method as set forth in any one of claims 1-12.

15. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 12 when the computer program is executed.

16. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 12.