CN111416142A - Correction method and device for battery cell, correction control equipment and correction system - Google Patents

Abstract

The embodiments of the present application provide a correction method, device, correction control device and correction system for a battery cell, the method comprising: obtaining multiple detection images obtained by acquiring images of the battery cell in a winding process by multiple image acquisition devices in their respective fixed fields of view; obtaining multiple first distance parameters/multiple second distance parameters between the first edge/second edge of the detection object of the battery cell wound to each layer and the first baseline/second baseline according to the multiple detection images, the detection object comprising an anode sheet, a cathode sheet or a diaphragm; among the multiple first distance parameters/second distance parameters, when the amount of data satisfying the first floating range/second floating range reaches a set ratio, calculating the edge change parameter of the detection object; comparing the edge change parameter with a pre-obtained correction reference to obtain a correction amount of the detection object, and the correction amount of the detection object is used to provide to an actuator to correct the next battery cell.

Description

Correction method, device, correction control device and correction system for battery cells

technical field

The present application relates to the technical field of product processing control, and in particular, to a deviation correction method, device, deviation correction control device and deviation correction system of a battery cell.

Background technique

Cells are an important part of batteries. In the processing and production of the cell, the anode sheet, the separator and the cathode sheet are wound on the winding needle. As the winding process proceeds, cells with increasing thickness are obtained. However, in the actual production process, it is difficult to ensure that the winding materials such as the anode sheet, cathode sheet, and diaphragm of each cell are always aligned. Phenomenon. When the dislocation amount exceeds a certain range, the safety of the battery will be affected.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a deviation rectification method, device, deviation rectification control device and deviation rectification system for a battery cell, which can improve the problem of affecting product quality due to failure to rectify the deviation of the battery cell in time in the prior art.

In a first aspect, an embodiment of the present application provides a method for correcting deviation of a battery cell, the method comprising:

During the winding process of the battery cell, acquiring a plurality of detection images obtained by image acquisition of the battery core by a plurality of image acquisition devices under their respective fixed fields of view;

According to the plurality of detection images, a plurality of first distance parameters between the first edge of each layer and the first reference line where the detection object of the battery cell is wound, and the detection object is wound to each layer are obtained. A plurality of second distance parameters between the second edge of the second reference line and the second reference line, the detection object includes an anode sheet, a cathode sheet or a diaphragm;

Among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches a set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches the set ratio When , the edge change parameters of the detection object are calculated, and the first floating range and the second floating range are respectively determined according to all the first distance parameters and all the second distance parameters of the detection object under all layers;

Comparing the edge change parameters of the detection object with the pre-obtained deviation correction reference, the deviation correction amount of the detection object is obtained, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation of the next cell.

In the above method, by monitoring the winding process of the battery cell, a plurality of first distance parameters and a plurality of second distance parameters are obtained according to a plurality of detection images collected during the winding process. , Analysis of a plurality of second distance parameters, to know the deviation of the detection objects such as the anode sheet, the cathode sheet or the diaphragm with the progress of the winding process. When the two distance parameters satisfy their respective floating ranges, and the amount of data satisfying the floating range reaches the set ratio, it means that the distribution of the two distance parameters is normal, and then the current volume of the cell can be calculated. The edge change parameter of the detection object under the winding process is compared, and the deviation correction amount can be obtained by comparing the edge change parameter with the deviation correction reference of the detection object. After the correction amount is provided to the actuator, the next cell can be corrected based on the correction amount. Through the above method, the misalignment of the anode sheet, the misalignment of the cathode sheet, and the misalignment of the diaphragm can be corrected in time, so as to reduce the misalignment of the anode sheet, the misalignment of the cathode sheet, and the misalignment of the diaphragm, and improve the quality of the cell product. Moreover, compared with the method of checking each process one by one after finding that a large number of cells are unqualified, the above method can reduce the workload of manual verification, the processing efficiency is higher, and it can avoid continuous errors due to accumulation of errors. There are many uncontrollable unqualified products, so as to improve the qualified rate of products.

In an optional implementation manner, before the calculating the edge change parameter of the detected object, the method further includes:

Calculate the first floating range of the detection object according to all first distance parameters of the detection object under all layers, and calculate the detection object according to all second distance parameters of the detection object under all layers the second float range of the object.

The above implementation provides a way to determine the floating range based on the actual distance parameter. Compared with the way of using a fixed interval as the floating range, the above implementation can obtain the floating range updated with the change of the distance parameter of each cell. The range is beneficial to determine the data centrality for the data of each cell in a targeted manner.

In an optional implementation manner, calculating the first floating range of the detection object according to all first distance parameters of the detection object under all layers includes:

determining the first median of all the first distance parameters of the detection object under all layers;

determining the first floating range based on the first median and the set fluctuation range;

The calculating the second floating range of the detection object according to all second distance parameters of the detection object under all layers, including:

determining the second median of all second distance parameters of the detection object under all layers;

The second floating range is determined based on the second median and the set fluctuation range.

Through the above implementation manner, the floating range is determined by combining the median and the set fluctuation range, and based on the floating range determined in this way, it is more beneficial to determine the data concentration of the cell in a targeted manner.

In an optional implementation manner, the calculating the edge change parameter of the detected object includes:

averaging the distance parameters within the first floating range among the plurality of first distance parameters to obtain a first average value;

averaging the distance parameters within the second floating range among the plurality of second distance parameters to obtain a second average value;

Based on the first average value and the second average value, an edge change parameter of the detection object is calculated.

The above implementation process provides a way to calculate the edge change parameter of the detected object.

In an optional embodiment, the method further includes:

Judging whether the deviation correction amount reaches a preset deviation correction threshold;

When the deviation correction amount reaches a preset deviation correction threshold, the actuator is controlled to perform a deviation correction operation according to the deviation correction threshold.

Through the above implementation manner, under the condition of satisfying the deviation rectification accuracy of the actuator, the deviation rectification control of subsequent cell products can be carried out in a step-by-step rectification manner.

In an optional embodiment, the method further includes:

When the amount of data within the first floating range among the plurality of first distance parameters does not reach the set ratio, or, within the second floating range among the plurality of second distance parameters When the amount of data does not reach the set ratio, a recheck prompt message will be sent.

Through the above implementation manner, when the distance parameter does not have data centrality, manual rechecking can be performed, and invalid deviation correction can be avoided to a certain extent in the case of abnormal data.

In a second aspect, an embodiment of the present application provides a device for correcting deviation of a battery cell, and the device includes:

an acquisition module, used for acquiring a plurality of detection images obtained by image acquisition of the battery cell by a plurality of image acquisition devices under their respective fixed fields of view during the winding process of the battery cell;

An identification module, configured to obtain, according to the plurality of detection images, a plurality of first distance parameters between the detection object of the battery cell wound to the first edge of each layer and the first reference line, and the detection object Winding to a plurality of second distance parameters between the second edge of each layer and the second reference line, the detection object includes an anode sheet, a cathode sheet or a separator;

The calculation module is used for, among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches a set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches When setting the scale, the edge change parameters of the detection object are calculated, and the first floating range and the second floating range are respectively based on all the first distance parameters and all the second distance parameters of the detection object under all layers. The distance parameter is determined;

The calculation module is also used to compare the edge change parameters of the detection object with the pre-obtained deviation correction reference to obtain the deviation correction amount of the detection object, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation. Correct the deviation of the next cell.

The above-mentioned method of the first aspect can be performed by the above-mentioned device, the winding process of the battery cell can be monitored, and the deviation of the anode sheet, cathode sheet or diaphragm of the battery cell can be corrected in time, so as to improve the product qualification rate.

In a third aspect, an embodiment of the present application provides a deviation correction control device, and the deviation correction control device includes:

memory;

processor;

A computer program executable by the processor is stored on the memory, and when the computer program is executed by the processor, the method described in the first aspect is performed.

In a fourth aspect, an embodiment of the present application provides a deviation correction system, the system includes: an image acquisition device, an actuator, and the deviation correction control device described in the third aspect;

Both the image acquisition device and the actuator are connected to the deviation correction control device;

The image acquisition device is used for image acquisition of the cell during the winding process under a fixed field of view, and sends the collected multiple detection images to the deviation correction control device;

The deviation correction control device is configured to calculate a deviation correction amount according to the plurality of detection images, and control the actuator to correct deviation of the next cell according to the deviation correction amount.

In a fifth aspect, an embodiment of the present application provides a storage medium, where a computer program executable by a processor is stored on the storage medium, and when the computer program is executed by the processor, the method described in the foregoing first aspect is executed.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, therefore It should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of a deviation correction system provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of a deviation correction control device provided by an embodiment of the present application.

FIG. 3 is a flowchart of a method for correcting deviation of a battery cell according to an embodiment of the present application.

FIG. 4 is a side view of a battery cell in a winding state in an example provided by the embodiments of the present application.

FIG. 5 is a schematic diagram of image acquisition of a battery cell by using four cameras in an example provided by an embodiment of the present application.

FIG. 6 is a schematic diagram of positions among edge line positions, reference line positions, and deviation correction reference positions of a detection object in an example provided by the embodiment of the present application.

FIG. 7 is a functional block diagram of a device for correcting deviation of a battery cell according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

Please refer to FIG. 1 , which is a schematic diagram of a deviation correction system provided by an embodiment of the present application.

As shown in FIG. 1 , the deviation correction system includes: an image acquisition device 100 , an actuator 300 and a deviation correction control device 200 . Both the image acquisition device 100 and the actuator 300 are connected to the deviation correction control device 200 .

The image acquisition device 100 is used to acquire images of the cells during the winding process under a fixed field of view, and send the acquired multiple detection images to the deviation correction control device 200 . The image acquisition device 100 may include an industrial camera and a lens on the industrial camera, and the industrial camera collects an image of the battery cell through the lens.

The deviation correction control device 200 is configured to calculate the deviation correction amount according to the plurality of detection images, and control the actuator to correct the deviation of the next cell according to the deviation correction amount. The deviation correction control device 200 may be an industrial computer, or a computer with computing processing capability and capable of communicating with the image acquisition device 100 and the execution mechanism 300 .

Wherein, the detection object of the battery cell may include an anode sheet, a cathode sheet or a diaphragm.

In one application scenario, the deviation correction system includes multiple image acquisition devices 100 , each of the multiple image acquisition devices 100 has its own fixed field of view, and the multiple image acquisition devices 100 are located in their respective fixed fields of view. Image acquisition was performed under the field of view. The images captured by each image capturing device 100 may be sent to the deviation correction control device 200 for processing. The deviation correction control device 200 recognizes and detects each received image, thereby obtaining the distance parameters of the detection object reflected in each image, and by analyzing and processing these distance parameters, it is determined whether based on the current winding condition of the battery cell. The next cell needs to be rectified, and when it is determined that the next cell needs to be rectified, a specific rectification amount is provided to the actuator 300 for performing the rectification operation for the actuator 300 to perform the rectification operation. After the deviation correction operation is completed, the winding can continue to produce the next cell product.

FIG. 2 shows a schematic diagram of a deviation correction control device 200 provided by an embodiment of the present application.

As shown in FIG. 2 , the deviation correction control device 200 includes: a memory 201 , a processor 202 , and a communication component 203 , and the memory 201 , the processor 202 , and the communication component 203 are directly or indirectly connected to realize data interaction.

The memory 201 is a storage medium, which can be, but is not limited to, a random access memory (Random Access Memory, RAM), a read only memory (Read Only Memory, ROM), a programmable read only memory (Programmable Read-Only Memory, PROM), or Erasable Programmable Read-Only Memory (EPROM), Electrical Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 201 stores a computer program executable by the processor 202, and when the computer program is executed by the processor 202, the method for correcting the deviation of the battery cell provided by the embodiment of the present application is executed.

The processor 202 has computing processing capability, and may be a central processing unit (Central Processing Unit, CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices (PLC), a processor built from discrete hardware components. The processor 202 may execute the computer program stored in the memory 201, thereby implementing the methods provided by the embodiments of the present application.

The communication component 203 can include a communication bus, through which the direct or indirect connection between the various internal components of the deviation correction control device 200 can be realized, and the deviation correction control device 200 can also be connected with the image acquisition device 100 and the actuator 300 through the communication bus. wired communication connection. The communication component 203 may also include a wireless communication module, and the deviation correction control device 200 can realize the wireless communication connection with the image acquisition device 100 and the actuator 300 through the wireless communication module, so as to perform wireless data transmission.

It can be understood that the structure shown in FIG. 2 is only for illustration, and during the specific implementation, the deviation correction control device 200 may also have more components, or have different configurations from the structure shown in FIG. 2 , for example, the deviation correction control device 200 may further include a display, which may be used to display images collected by the image collection device 100, and may also display data such as distance parameters, deviation correction amounts, and the like obtained by the cell deviation correction method provided in the embodiment of the present application.

Please refer to FIG. 3 , which is a flowchart of a method for correcting deviation of a battery cell provided by an embodiment of the present application. The method can be applied to deviation correction control equipment. The method provided by the embodiment of the present application will be described in detail below with reference to the flow shown in FIG. 3 .

As shown in FIG. 3, the method may include steps S31-S37.

S31 : During the winding process of the battery cell, acquire a plurality of detection images obtained by image acquisition of the battery core by a plurality of image acquisition devices under their respective fixed fields of view.

Wherein, the cell is a wound cell. The image acquisition device may be a charge coupled device (charge coupled device, CCD for short).

S33: According to the plurality of detection images, obtain a plurality of first distance parameters between the detection object of the battery cell wound to the first edge of each layer and the first reference line, and the detection object to be wound to the second edge of each layer A plurality of second distance parameters to the second reference line.

Wherein, the detection object includes an anode sheet, a cathode sheet or a diaphragm. That is, the anode sheet, the cathode sheet, and the diaphragm can all be used as detection objects in the embodiments of the present application, and the deviation correction processes of the anode sheet, the cathode sheet, and the diaphragm are independent of each other.

The first reference line and the second reference line may be used as reference positions, and the first reference line and the second reference line may be virtual reference lines determined by correlating and calibrating each image acquisition device. The anode sheet, cathode sheet, and separator all have two opposing edge lines. The two opposite edge lines are denoted as the first edge and the second edge, which can respectively represent the left edge and the right edge of the same detection object. The first distance may be the distance between the left edge of the detection object and the first reference line, and the second distance may be the distance between the right edge of the detection object and the second reference line. Each time the anode sheet, cathode sheet, and diaphragm of the cell rotate around the reel (that is, one layer is added for each winding of the cell), at least one pair of distance values can be detected, and each pair of distance values includes a first distance parameter and a The second distance parameter.

As the winding process of the battery cell proceeds, the number of layers of the battery core increases, the collected detection images increase, and the number of obtained first distance parameters and second distance parameters increases.

S35: Among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches the set ratio, and among the plurality of second distance parameters, when the amount of data satisfying the second floating range reaches the set ratio, calculate and detect The edge change parameter of the object.

Wherein, the first floating range and the second floating range are respectively determined according to all first distance parameters and all second distance parameters of the detection object under all layers. Among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches the set ratio, and among the plurality of second distance parameters, when the amount of data satisfying the second floating range reaches the set ratio, it is considered that the data obtained in S33 is obtained The multiple first distance parameters of , and the multiple first distance parameters have data centrality. The set ratio may be 60%, 65%, 70%, 75%, etc. of the first/second distance parameter.

S37: Compare the edge change parameters of the detection object with the pre-obtained deviation correction reference to obtain the deviation correction amount of the detection object, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation of the next cell.

Taking the detection object as an anode sheet as an example, when the above S31-37 are performed, multiple detection images of the anode sheet of the battery cell during the winding process of the battery cell can be obtained through S31. Then, S33 may be executed to obtain a plurality of first distance parameters between the first edge of the anode sheet wound to the first edge of each layer and the first reference line according to the plurality of detection images of the anode sheet, and the anode sheet wound to each layer A plurality of second distance parameters between the second edge of the second reference line. Then, a centralized data analysis can be performed on the plurality of first distance parameters of the anode sheet and the plurality of second distance parameters of the anode sheet, respectively, where the plurality of first distance parameters and the plurality of second distance parameters of the anode sheet have When the data is centralized, calculate the edge variation parameters of the anode sheet (corresponding to S35). After the edge change parameters of the anode sheet are compared with the deviation correction reference of the anode sheet, the deviation correction amount of the anode sheet is obtained (corresponding to S37), and the deviation correction amount is used to correct the deviation of the anode sheet of the next cell.

It can be understood that the above execution process can also be used to correct the deviation of the cathode sheet and the diaphragm. For example, multiple sets of detection images of the anode sheet, cathode sheet and diaphragm of a cell can be obtained through S31, and multiple first distance parameters of the anode sheet, multiple first distance parameters of the cathode sheet, and multiple first distance parameters of the membrane can be determined through S33. A first distance parameter, a plurality of second distance parameters of the anode sheet, a plurality of second distance parameters of the cathode sheet, and a plurality of second distance parameters of the diaphragm, and the edge change parameters of the anode sheet and the edge change of the cathode sheet are calculated through S35 parameter and the edge change parameter of the diaphragm. Through S37, after comparing the edge variation parameters of the anode sheet, the edge variation parameters of the cathode sheet, and the edge variation parameters of the diaphragm with the correction reference parameters of the anode sheet, the correction reference parameters of the cathode sheet, and the correction reference parameters of the diaphragm, respectively, the anode is obtained. The deviation correction amount of the plate, the deviation correction amount of the cathode plate, and the deviation correction amount of the diaphragm can be used for the correction amount of the anode plate, the deviation correction amount of the cathode plate and the deviation correction amount of the diaphragm calculated this time. Sheets, cathode sheets and diaphragms are corrected.

In the above methods S31-S37, by monitoring the winding process of the battery cell, a plurality of first distance parameters and a plurality of second distance parameters are obtained according to a plurality of detection images collected during the winding process. The analysis of the first distance parameter and the plurality of second distance parameters shows the deviation of the detection objects such as the anode sheet, the cathode sheet or the diaphragm with the progress of the winding process. When the two distance parameters satisfy their respective floating ranges, and the amount of data satisfying the floating range reaches the set ratio, it means that the distribution of the two distance parameters is normal, and then the current volume of the cell can be calculated. The edge change parameter of the detection object under the winding process is compared, and the deviation correction amount can be obtained by comparing the edge change parameter with the deviation correction reference of the detection object. After the correction amount is provided to the actuator, the next cell can be corrected based on the correction amount. Through the above method, the misalignment of the anode sheet, the misalignment of the cathode sheet, and the misalignment of the diaphragm can be corrected in time, so as to reduce the misalignment of the anode sheet, the misalignment of the cathode sheet, and the misalignment of the diaphragm, and improve the quality of the cell product. Moreover, compared with the method of checking each process one by one after finding that a large number of cells are unqualified, the above method can reduce the workload of manual verification, the processing efficiency is higher, and it can avoid continuous errors due to accumulation of errors. There are many uncontrollable unqualified products, so as to improve the qualified rate of products.

The above-mentioned methods of S31-S37 will be described in detail below with reference to an example.

Figure 4 shows a side view of the cell in a wound state in one example. As shown in FIG. 4 , the material wound around the cell winding needle M includes an anode sheet T1 , a cathode sheet T2 , and a separator T3 . The separator T3 is used for isolation between the anode sheet T1 and the cathode sheet T2. Before the cell winding needle M starts to rotate, the anode sheet T1, the cathode sheet T2, and the separator T3 can be sandwiched in the gap of the cell winding needle M (the rectangular area in FIG. 4) according to the layout of FIG. The anode sheet T1, cathode sheet T2, and separator T3 are fixed, and then the anode sheet T1, cathode sheet T2, and separator T3 are wound around the cell winding needle with the rotation of the cell winding needle M. M, thereby forming the surface of each layer of the cell. In this FIG. 4, "B1", "B2", and "B3" are the positions where the cell is wound to different layers.

In the implementation process of S31, as the winding process of the battery cell proceeds, the image acquisition device can capture the image of the battery cell from a specified direction (eg, the direction indicated by "P" in FIG. Detection images of each layer.

As an implementation manner, the processor in the deviation correction control device may be a programmable logic controller (PLC). The deviation correction control device (or PLC) determines whether to trigger the camera to take pictures by judging whether the motor that drives the cell winding needle to rotate rotates the set angle. For example, the programmable logic controller can output a level signal to trigger four cameras to take pictures when it is detected that the winding needle of the battery rotates every 180 degrees.

FIG. 5 shows a schematic diagram of image acquisition of a battery cell by four cameras in an example. For convenience of description, the four cameras are respectively denoted as a first camera CCD1, a second camera CCD2, a third camera CCD3, and a fourth camera CCD4.

As shown in FIG. 5 , the distance d1 between the first edge of the diaphragm T3 and the first reference line K1 and the distance d1 between the first edge of the anode sheet T1 and the first reference line K1 can be obtained through the detection image of the first camera CCD1 Distance d2; through the detection image of the third camera CCD3, the distance d5 between the second edge of the diaphragm T3 and the second reference line K2, and the distance between the second edge of the anode sheet T1 and the second reference line K2 can be obtained d6. Through the detection image of the second camera CCD2, the distance d3 between the first edge of the diaphragm T3 and the first reference line K1, and the distance d4 between the first edge of the cathode sheet T2 and the first reference line K1 can be obtained; The detection image of the camera CCD4 can obtain the distance d7 between the second edge of the diaphragm T3 and the second reference line K2, and the distance d8 between the second edge of the cathode sheet T2 and the second reference line K2.

Assuming that the cell needs to be wound with n layers, and one image acquisition is performed every 180 degrees of winding, each image acquisition device can obtain 2n detection images. After detecting and identifying the 4*2n detection images of the four cameras, 2n d1 to d8 can be obtained.

In other instances, for the consideration of equipment cost, other numbers of image acquisition devices can be used for image acquisition. For example, one or two cameras with a larger field of view can be used to acquire images of cells, so that the same detection image can reflect the Distance parameter for multiple locations. In order to ensure the detection accuracy, this example continues to take 2n d1 to d8 obtained based on four cameras as an example for description.

Among them, since the deviation correction of the anode sheet, the cathode sheet and the diaphragm do not interfere with each other, when the anode sheet is used as the detection object for deviation correction, 2n d2 can be used as a plurality of first distance parameters in the aforementioned step S33, and 2n d6 is used as a plurality of second distance parameters in step S33, so that the above-mentioned methods of S33-S37 are performed based on 2n d2 and 2n d6, so as to correct the deviation of the anode sheet of the next cell.

When the cathode sheet is used as the detection object for deviation correction, 2n d4 and 2n d8 can be respectively used as the multiple first distance parameters and multiple second distance parameters in the aforementioned step S33, so that the 2n d4 and 2n Each d8 performs the above-mentioned methods of S33-S37 to correct the deviation of the cathode sheet of the next cell.

In the same way, when the diaphragm is used as the detection object for deviation correction, 2n d3 and 2n d7 can be used as the first distance parameters and the second distance parameters in the aforementioned step S33, respectively, so as to measure the accuracy of the next cell. When the diaphragm is rectified, 2n d1 and 2n d5 can also be used as multiple first distance parameters and multiple second distance parameters in the foregoing step S33, respectively, to rectify the deviation of another diaphragm of the next cell.

As an implementation manner, for the detection object of the same type (anode sheet or cathode sheet or diaphragm), after multiple first distance parameters and multiple second distance parameters are determined, the multiple first distance parameters can be detected. and the data centrality of the plurality of second distance parameters. When the values of these distance parameters are relatively concentrated, it can be considered that the obtained distance parameters are valid, and at this time, S35 can be executed to calculate the edge change parameters of the detection object.

Therefore, before performing S35, based on the plurality of first distance parameters and the plurality of second distance parameters obtained in S33, S34 may be performed to determine whether the selected distance parameters have data centrality.

S34: Determine whether the amount of data within the first floating range among the plurality of first distance parameters reaches the set ratio, and judge whether the amount of data within the second floating range among the plurality of second distance parameters reaches the setting Proportion.

The first floating range is calculated according to all first distance parameters of the detection object under all layers, and the second floating range is calculated according to all second distance parameters of the detection object under all layers.

When it is determined through S34 that among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches the set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches the set ratio. When scaling, S35 is performed to calculate the edge change parameter of the detection object.

When it is determined through S34 that the amount of data within the first floating range among the plurality of first distance parameters does not reach the set ratio, or, the amount of data within the second floating range among the plurality of second distance parameters does not reach When the ratio is set, it is considered that the multiple first distance parameters or multiple second distance parameters for the same detection object do not have data centrality, and the data is abnormal. At this time, a retest prompt message can be issued. That is, when there is no data centrality, the deviation correction is not performed, but a re-inspection prompt message is issued, and the re-inspection can be manually participated in after the current cell winding is completed, so as to avoid abnormal data to a certain extent. Invalid deviation correction is performed below.

In an example, for 2n first distance parameters and 2n second distance parameters, the calculated first floating range is denoted as f1±e mm, and the calculated second floating range is denoted as f2±e mm, and set The ratio is 60% (can also be 65%, 70%, 75%, etc.). If among the 2n first distance parameters, the amount of data in the floating range of f1±e reaches 2n*60%, it can be considered that the 2n first distance parameters have data centrality. If the 2n second distance parameters , if the amount of data in the floating range of f2±e reaches 2n*60%, it can be considered that the 2n second distance parameters have data centrality. When both the 2n first distance parameters and the 2n second distance parameters have data centrality, the edge change parameter of the detected object may be calculated based on the 2n first distance parameters and the 2n second distance parameters. Based on this principle, the data concentration of any one of the 2n distance parameters from d1 to d8 can be judged separately, so that the edge change parameters of the anode sheet, the edge change parameters of the cathode sheet, and the edge change parameters of the diaphragm can be calculated respectively.

As an implementation manner, according to all the first distance parameters of the detection object under all layers, the process of calculating the first floating range of the detection object may include sub-steps S341-S342, according to all the second distances of the detection object under all layers parameter, the process of calculating the second floating range of the detection object may include sub-steps S343-S344.

S341: Determine the first median of all the first distance parameters of the detection object under all layers.

S342: Determine the first floating range based on the first median and the set fluctuation range.

S343: Determine the second median of all second distance parameters of the detection object under all layers.

S344: Determine a second floating range based on the second median and the set fluctuation range.

Wherein, the set fluctuation range may be ±0.1 mm, the first floating range may be expressed as (first median ±0.1 mm), and the second floating range may be expressed as (second median ±0.1 mm). It can be understood that, in other embodiments, the fluctuation range may also be other ranges, for example, the fluctuation range may be ±0.15 mm, ±0.2 mm, ±0.3 mm, and the like.

在该2n个d2或2n个d6不具有数据集中性时，可以发出复检提示信息以通知用户进行人工复检。Taking each distance parameter in Figure 5 as an example, when the anode sheet is used as the detection object, the 2n d2 can be sorted, and the median d2' of the 2n d2 can be determined as the first median, and Sort the 2n d6s and determine the median d6' among the 2n d6s as the second median. In the 2n d2s, the amount of data in the first floating range (d2'±0.1 mm) reaches 2n*60%, and in the 2n d6s, the data in the second floating range (d6'±0.1 mm) When the amount reaches 2n*60%, the edge change parameters of the anode sheet can be calculated

When the 2n d2 or 2n d6 do not have data centrality, a rechecking prompt message may be issued to notify the user to perform manual rechecking.

Based on the same principle, when the diaphragm is used as the detection object, the first median d3' and the second median d7' suitable for diaphragm deviation correction can be obtained based on 2n d3 and 2n d7, and the corresponding first floating The range and the second floating range are respectively d3'±0.1 mm and d7'±0.1 mm. When the cathode sheet is used as the detection object, based on 2n d4 and 2n d8, the first median d4' and the second median d8' suitable for the deviation correction of the cathode sheet, the corresponding first floating range, The two floating ranges are respectively d4'±0.1 mm and d8'±0.1 mm.

Through the implementation of the above S341-S344, the first floating range and the second floating range under the current winding condition can be obtained according to the actual winding condition of the current cell, which is convenient to determine whether the distance parameter in the current winding state has Data centrality. When there is data centrality, the deviation correction amount of the detection object can be further calculated. When there is no data centrality, after the winding process of the current cell is completed, the secondary device can be used for re-inspection manually.

As an implementation manner of the above S35, the process of calculating the edge change parameter of the detection object in the above S35 may include sub-steps S351-S353.

S351: Average the distance parameters within the first floating range among the plurality of first distance parameters to obtain a first average value.

S352: Average the distance parameters within the second floating range among the plurality of second distance parameters to obtain a second average value.

S353: Calculate the edge change parameter of the detection object based on the first average value and the second average value.

In an example, the amount of data within the first floating range of the 20 first distance parameters exceeds 12 (ie 20*60%), and the amount of data within the first floating range reaches 16 (ie 20*80%), the 16 first distance parameters within the first floating range can be averaged to obtain the average value of the 16 parameters as the first average value. The calculation method of the second average value may refer to the calculation method of the first average value.

The edge change parameter of the detection object can be expressed as: the average value of the difference between the first average value and the second average value, that is, the edge change parameter=(the first average value−the second average value)/2.

For 2n d1 to d8, the above implementations of S351-S353 can be used, and the average value is calculated based on the distance parameters within the corresponding floating range.

根据处于(d6’±0.1毫米)这一第二浮动范围内的多个第二距离参数可计算出第二平均值

阳极片的边缘变化参数

When the anode sheet is used as the detection object, the first average value can be calculated according to a plurality of first distance parameters within the first floating range of (d2'±0.1 mm).

The second average value can be calculated according to a plurality of second distance parameters within the second floating range of (d6'±0.1 mm).

Edge Variation Parameters of Anode Sheets

根据处于(d8’±0.1毫米)这一第二浮动范围内的多个第二距离参数可计算出第二平均值

阴极片的边缘变化参数

When the cathode sheet is used as the detection object, the first average value can be calculated according to a plurality of first distance parameters within the first floating range of (d4'±0.1 mm).

The second average value can be calculated according to a plurality of second distance parameters within the second floating range of (d8'±0.1 mm).

Edge Variation Parameters of Cathode

根据处于(d7’±0.1毫米)这一第二浮动范围内的多个第二距离参数可计算出第二平均值

隔膜的边缘变化参数

When the diaphragm is used as the detection object, the first average value can be calculated according to a plurality of first distance parameters within the first floating range of (d3'±0.1 mm).

The second average value can be calculated according to a plurality of second distance parameters within the second floating range of (d7'±0.1 mm).

Diaphragm edge variation parameters

与阳极片的纠偏基准参数Ac进行对比，可得到阳极片的纠偏量A’。通过将阴极片的边缘变化参数

与阴极片的纠偏基准参数Cc进行对比，可得到阴极片的纠偏量C’。通过将隔膜的边缘变化参数

与隔膜的纠偏基准参数Sc进行对比，可得到阴极片的纠偏量S’。Regarding the above S37, by changing the parameters of the edge of the anode sheet

Comparing with the correction reference parameter Ac of the anode sheet, the correction amount A' of the anode sheet can be obtained. By changing the parameters of the edge of the cathode

Comparing with the correction reference parameter Cc of the cathode sheet, the correction amount C' of the cathode sheet can be obtained. By changing the parameters of the edge of the diaphragm

Comparing with the correction reference parameter Sc of the diaphragm, the correction amount S' of the cathode sheet can be obtained.

Regarding the deviation correction benchmark parameters Ac, Cc, and Sc, they may be benchmark parameters determined after the results of multiple winding tests are counted and averaged before the official production.

The deviation correction reference parameter of the detection object may be used to represent the distance between the deviation correction reference position of the detection object and the first reference line K1. Taking the position diagram shown in FIG. 6 as an example, since the first reference line K1 and the second reference line K2 are reference positions, the distance L between the first reference line K1 and the second reference line K2 can be regarded as a priori value.

Let the deviation correction benchmark of the detection object be (X1-X2)/2, X1 (not shown in the figure) is the distance from the first edge of the detection object to the first reference line K1 when no deviation correction is required, and X2 (not shown in the figure) is The distance between the second edge of the detection object and the second reference line K2 when no deviation correction is required, the distance between the deviation correction reference position of the detection object relative to the first reference line K1 can be expressed as: (L-X2-X1)/2 +X1=L/2-X2/2-X1/2+X1=L/2-X2/2+X1/2=(X1-X2)/2+L/2=Offset correction reference of detection object+L/2 . Based on this principle, the distance of the correction reference position Ac0 of the anode sheet relative to the first reference line K1 can be expressed as: Ac0=correction reference parameter Ac+L/2 of the anode sheet, and the correction reference position Cc0 of the cathode sheet is relative to the first reference The distance of the line K1 can be expressed as: Cc0=correction reference parameter Cc+L/2 of the cathode sheet, and the distance of the correction reference position Sc0 of the diaphragm relative to the first reference line K1 can be expressed as: Sc0=The correction reference parameter of the diaphragm Sc+ L/2.

在计算阳极片的纠偏量A’时，将阳极片的中心线位置A1与阳极片的纠偏基准位置Ac0相对于第一基准线K1的距离进行对比，由于A1、Ac0这两个参数都带有“+L/2”这一项，因此将A1与Ac0作差得到的结果是：阳极片的纠偏量A’＝A1-Ac0＝(阳极片的边缘变化参数

)-(阳极片的纠偏基准Ac+L/2)＝阳极片的边缘变化参数

-阳极片的纠偏基准Ac。因此在实际执行S37以计算纠偏量时，无需获取或测量实际的L也可以计算出纠偏量，仅需将检测对象的边缘变化参数和预先得到的纠偏基准进行对比即可。Taking the correction calculation of the anode sheet as an example, in the production process of the cell, the centerline position A1 of the anode sheet can be expressed as: A1=edge variation parameter

When calculating the correction amount A' of the anode sheet, compare the distance between the center line position A1 of the anode sheet and the correction reference position Ac0 of the anode sheet relative to the first reference line K1, since the two parameters A1 and Ac0 have The item "+L/2", so the result obtained by making the difference between A1 and Ac0 is: the correction amount of the anode sheet A'=A1-Ac0=(the edge change parameter of the anode sheet

)-(correction reference Ac+L/2 of anode sheet) = edge change parameter of anode sheet

- Correction reference Ac of the anode sheet. Therefore, when S37 is actually executed to calculate the deviation correction amount, the deviation correction amount can be calculated without acquiring or measuring the actual L, and it is only necessary to compare the edge change parameters of the detection object with the pre-obtained deviation correction reference.

Based on this principle, it is not necessary to obtain or measure the distance L between the two reference lines (K1 and K2) when calculating the deviation correction amount C' of the cathode sheet and the deviation correction amount S' of the diaphragm, and only the edge of the cathode sheet needs to be changed. The rectification amount C' of the cathode sheet can be obtained by comparing the parameters with the rectification reference of the cathode sheet, and the rectification amount S' of the diaphragm can be obtained only by comparing the edge change parameters of the diaphragm with the rectification reference of the diaphragm.

Through the above implementation manner, a highly reliable deviation correction amount can be obtained, and deviation correction can be carried out in time when a dislocation phenomenon occurs, thereby improving the quality of subsequent cell products.

Optionally, based on the deviation correction amount calculated through S37, the above method may further include steps S38-S39.

S38: Determine whether the deviation correction amount reaches a preset deviation correction threshold.

S39 : when the deviation correction amount reaches the preset deviation correction threshold, the actuator is controlled to perform the deviation correction operation according to the deviation correction threshold.

The deviation correction threshold is related to the deviation correction accuracy allowed by the deviation correction mechanism, and the deviation correction threshold is smaller than the absolute value of the aforementioned fluctuation range. Still taking the fluctuation range of ±0.1 mm as an example, the deviation correction threshold may be less than 0.1 mm, for example, the deviation correction threshold may be 0.02, 0.04, 0.05, 0.07 mm and the like.

In one example, the fluctuation range used in determining the first floating range and the second floating range is ±0.1 mm, and the set deviation correction threshold is 0.05 mm, and the deviation correction amount obtained in S37 is compared with 0.05 mm, if S37 calculates If the output correction amount is less than 0.05 mm, it can be considered that the correction amount is too small and will not participate in the correction this time. If the deviation correction amount calculated by S37 is greater than or equal to 0.05 mm, since the data has been judged by ±0.1 mm when calculating the edge detection range of the detection object, considering that there may be other unknown influencing factors that may cause the detection object to be biased Therefore, when the deviation correction amount calculated by S37 is greater than 0.05 mm, the detection object of the next cell can be corrected by 0.05 mm. That is, when the deviation correction amount is greater than 0.05 mm, only 0.05 mm of deviation can be corrected. In this way, under the condition of satisfying the deviation rectification accuracy of the actuator, the closed-loop deviation rectification of the subsequent cells can be carried out in a gradual deviation rectification manner.

To sum up, the above method can combine real-time visual inspection with programmable control to realize the correction control of the cell, improve the misalignment of the cathode and anode of the cell, and avoid the misalignment of the cathode and anode as much as possible. It can improve the quality of cells and batteries, and improve the safety of the use of cells and battery products.

Based on the same inventive concept, please refer to FIG. 7 , an embodiment of the present application further provides a deviation correction device 400 for a battery cell. FIG. 7 is a functional block diagram of the deviation correction device 400 of the cell.

As shown in FIG. 7 , the apparatus includes: an acquisition module 401 , an identification module 402 , and a calculation module 403 .

The acquisition module 401 is configured to acquire a plurality of detection images obtained by image acquisition of the battery cell by a plurality of image acquisition devices under respective fixed fields of view during the winding process of the battery cell.

The identification module 402 is used to obtain a plurality of first distance parameters between the first edge of each layer and the first reference line where the detection object of the battery cell is wound to each layer, and the detection object is wound to each layer according to the plurality of detection images. A plurality of second distance parameters between the second edge of the second reference line and the second reference line, and the detection object includes an anode sheet, a cathode sheet or a diaphragm.

The calculation module 403 is used for, among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches the set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches the set ratio When , the edge change parameters of the detection object are calculated, and the first floating range and the second floating range are respectively determined according to all the first distance parameters and all the second distance parameters of the detection object under all layers.

The calculation module 403 is also used to compare the edge change parameters of the detection object with the pre-obtained deviation correction reference to obtain the deviation correction amount of the detection object, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation of the next cell. .

The above-mentioned method for correcting the deviation of the battery cell can be performed by the above-mentioned device, and by monitoring the winding process of the battery cell, the deviation of the anode sheet, the cathode sheet or the diaphragm of the cell can be corrected in time to improve the product qualification rate.

Optionally, the calculation module 403 can be further configured to: calculate the first floating range of the detection object according to all the first distance parameters of the detection object under all layers, and calculate the first floating range of the detection object according to the detection object in all layers. All the second distance parameters below, the second floating range of the detection object is calculated.

Optionally, the calculation module 403 can also be used to: determine the first median of all the first distance parameters of the detection object under all layers; determine based on the first median and the set fluctuation range the first floating range; determining the second median of all the second distance parameters of the detection object under all layers; determining the second median based on the second median and the set fluctuation range 2. Floating range.

Optionally, the calculation module 403 can be further configured to: average the distance parameters within the first floating range among the plurality of first distance parameters to obtain a first average value; Among the distance parameters, the distance parameters within the second floating range are averaged to obtain a second average value; based on the first average value and the second average value, the edge change parameter of the detection object is calculated.

Optionally, the device may further include: an execution module, which can be used to: determine whether the deviation correction amount reaches a preset deviation correction threshold; when the deviation correction amount reaches the preset deviation correction threshold, control the execution mechanism The deviation correction operation is performed according to the deviation correction threshold.

For other details of the device 400 for correcting the deviation of the battery cell provided by the embodiment of the present application, please refer to the relevant description of the deviation correcting method for the battery cell, which will not be repeated here.

In addition to the foregoing embodiments, the embodiments of the present application further provide a storage medium, where a computer program executable by a processor is stored on the storage medium, and the aforementioned method is executed when the computer program is executed by the processor.

In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are only illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated. to another system. On the other hand, the discussed connection between each other may be through some communication interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

In addition, units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

Furthermore, each functional module in each embodiment of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

It should be noted that, if the functions are implemented in the form of software function modules and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device to perform all or part of the steps of the methods of various embodiments of the present application.

In this document, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such existence between these entities or operations. The actual relationship or sequence.

The above are only examples of the present application, and are not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. A deviation correction method for a battery cell, characterized in that the method comprises: During the winding process of the battery cell, acquiring a plurality of detection images obtained by image acquisition of the battery core by a plurality of image acquisition devices under their respective fixed fields of view; According to the plurality of detection images, a plurality of first distance parameters between the first edge of each layer and the first reference line where the detection object of the battery cell is wound, and the detection object is wound to each layer are obtained. A plurality of second distance parameters between the second edge of the second reference line and the second reference line, the detection object includes an anode sheet, a cathode sheet or a diaphragm; Among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches a set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches the set ratio When , the edge change parameters of the detection object are calculated, and the first floating range and the second floating range are respectively determined according to all the first distance parameters and all the second distance parameters of the detection object under all layers; Comparing the edge change parameters of the detection object with the pre-obtained deviation correction reference, the deviation correction amount of the detection object is obtained, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation of the next cell. 2 . The method according to claim 1 , wherein, before the calculating the edge change parameter of the detected object, the method further comprises: 2 . Calculate the first floating range of the detection object according to all first distance parameters of the detection object under all layers, and calculate the detection object according to all second distance parameters of the detection object under all layers the second float range of the object. 3 . The method according to claim 2 , wherein calculating the first floating range of the detection object according to all first distance parameters of the detection object under all layers comprises: 3 . determining the first median of all the first distance parameters of the detection object under all layers; determining the first floating range based on the first median and the set fluctuation range; The calculating the second floating range of the detection object according to all second distance parameters of the detection object under all layers, including: determining the second median of all second distance parameters of the detection object under all layers; The second floating range is determined based on the second median and the set fluctuation range. 4. The method according to claim 1, wherein the calculating the edge change parameter of the detection object comprises: averaging the distance parameters within the first floating range among the plurality of first distance parameters to obtain a first average value; averaging the distance parameters within the second floating range among the plurality of second distance parameters to obtain a second average value; Based on the first average value and the second average value, an edge change parameter of the detection object is calculated. 5. The method according to claim 1, wherein the method further comprises: Judging whether the deviation correction amount reaches a preset deviation correction threshold; When the deviation correction amount reaches a preset deviation correction threshold, the actuator is controlled to perform a deviation correction operation according to the deviation correction threshold. 6. The method of claim 1, wherein the method further comprises: When the amount of data within the first floating range among the plurality of first distance parameters does not reach the set ratio, or, within the second floating range among the plurality of second distance parameters When the amount of data does not reach the set ratio, a recheck prompt message will be sent. 7. A device for correcting deviation of a cell, wherein the device comprises: an acquisition module, used for acquiring a plurality of detection images obtained by image acquisition of the battery cell by a plurality of image acquisition devices under their respective fixed fields of view during the winding process of the battery cell; An identification module, configured to obtain, according to the plurality of detection images, a plurality of first distance parameters between the detection object of the battery cell wound to the first edge of each layer and the first reference line, and the detection object Winding to a plurality of second distance parameters between the second edge of each layer and the second reference line, the detection object includes an anode sheet, a cathode sheet or a separator; The calculation module is used for, among the plurality of first distance parameters, the amount of data satisfying the first floating range reaches a set ratio, and among the plurality of second distance parameters, the amount of data satisfying the second floating range reaches When setting the scale, the edge change parameters of the detection object are calculated, and the first floating range and the second floating range are respectively based on all the first distance parameters and all the second distance parameters of the detection object under all layers. The distance parameter is determined; The calculation module is also used to compare the edge change parameters of the detection object with the pre-obtained deviation correction reference to obtain the deviation correction amount of the detection object, and the deviation correction amount of the detection object is used to provide the actuator to correct the deviation. Correct the deviation of the next cell. 8. A deviation correction control device, characterized in that, the deviation correction control device comprises: memory; processor; A computer program executable by the processor is stored on the memory, and when the computer program is executed by the processor, the method of any one of claims 1-6 is executed. 9. A deviation correction system, characterized in that, the system comprises: an image acquisition device, an executive mechanism, and the deviation correction control device according to claim 8; Both the image acquisition device and the actuator are connected to the deviation correction control device; The image acquisition device is used for image acquisition of the cell during the winding process under a fixed field of view, and sends the collected multiple detection images to the deviation correction control device; The deviation correction control device is configured to calculate a deviation correction amount according to the plurality of detection images, and control the actuator to correct deviation of the next cell according to the deviation correction amount. 10. A storage medium, wherein a computer program executable by a processor is stored on the storage medium, and when the computer program is executed by the processor, the method according to any one of claims 1-6 is executed .

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