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CN-121994147-A - Method and device for detecting turnover qualification of tab

CN121994147ACN 121994147 ACN121994147 ACN 121994147ACN-121994147-A

Abstract

The invention discloses a tab turnover qualification detection method and device. The tab turnover qualification detection method comprises the steps of collecting thickness data information of tab characteristic positions of a tab to be detected after the tab is folded and fixed, obtaining sample characteristic thickness data, comparing the sample characteristic thickness data with a standard specification interval obtained in advance, and judging the qualification of the tab turnover of the sample according to a comparison result. According to the invention, based on the physical characteristics that the thickness of the turnover tab changes after the winding of the pole group is completed, the tab thickness data of the fixed area after the tab is folded is collected in real time, and the characteristic thickness data is compared with the standard specification interval, so that the tab turnover qualification judgment is realized, and the battery with the turnover condition can be effectively prevented from entering the welding process, and the product quality is affected.

Inventors

  • CAO PING
  • LI BAODE
  • ZHANG RUI

Assignees

  • 中汽新能电池科技有限公司

Dates

Publication Date
20260508
Application Date
20260129

Claims (10)

  1. 1. The tab turnover qualification detection method is characterized by comprising the following steps: After the electrode lugs are folded and the measured electrode group sample is fixed, acquiring thickness data information of characteristic positions of the electrode lugs to obtain characteristic thickness data of the sample; And comparing the sample characteristic thickness data with a standard specification interval obtained in advance, and judging the qualification of the turnover of the sample tab according to a comparison result.
  2. 2. The tab fold-over eligibility detection method according to claim 1, further comprising, after obtaining the comparison result: and outputting a result feedback graph after the sample characteristic thickness data is in one-to-one correspondence with the tab characteristic positions and the turning states, wherein the result feedback graph is used for representing the tab turning states of the tab characteristic positions through color distinction.
  3. 3. The method for detecting turnover eligibility of tabs according to claim 1, wherein the standard specification interval is obtained by performing thickness data acquisition and post-analysis processing on tab characteristic positions of a plurality of tab defect-free tab group samples.
  4. 4. The tab fold-over eligibility detection method of claim 1 wherein the tab feature locations are a plurality of feature regions selected according to a width of a folded tab upper base.
  5. 5. The tab fold-over eligibility detection method of claim 4, wherein the range of the characteristic region is determined according to a product of a single test scan number of the test device and a single measurement minimum area.
  6. 6. The tab fold-over eligibility detection method of claim 1, wherein the standard specification interval is determined by the following calculation: ; Wherein, the Representing a calculation function based on the gauge interval of the thickness, Is the first The standard thickness of each single-layer tab is equal to that of the other single-layer tab, As a coefficient of deviation (f) the value of the deviation, Is the first The material feeding tolerance of each single-layer lug, Is a compensation value.
  7. 7. The tab turnover eligibility detection method according to claim 2, wherein the sample characteristic thickness data corresponds to tab characteristic positions one by one, and is processed by the following conversion formula: ; Wherein, the Representing a transfer function based on the sample point thickness data, In order to compensate for the value of the compensation, 、 Is the first The periodic eigenvalue coefficients of the individual sampling points, The number of data to be used is, Is the first The thickness data of each sampling point is recorded, The circumference of the running track of the thickness measuring equipment is measured.
  8. 8. The tab turnover eligibility detection method of claim 1, wherein the thickness data information is collected from tab characteristic positions by using a laser thickness measurement device.
  9. 9. The method for detecting turnover eligibility of tabs according to claim 1, wherein tab heights of the measured electrode group samples are arranged in incremental arithmetic progression from the outer ring inwards.
  10. 10. The tab fold-over eligibility detection device for implementing the tab fold-over eligibility detection method according to any one of claims 1 to 9, characterized by comprising: The data collection unit is used for collecting thickness data information of the characteristic positions of the electrode lugs of the electrode group to be measured after the electrode lugs are folded and the electrode group to be measured are fixed, so as to obtain characteristic thickness data of the sample; The data processing judging unit is used for comparing the sample characteristic thickness data with a standard specification interval obtained in advance and judging the qualification of the turnover of the sample tab according to a comparison result; Preferably, the method further comprises: the result conversion feedback unit is used for outputting a result feedback graph after the sample characteristic thickness data and the tab characteristic positions are in one-to-one correspondence, and the result feedback graph is used for distinguishing the tab turnover qualification of the characteristic positions of the represented tab through different colors.

Description

Method and device for detecting turnover qualification of tab Technical Field The invention relates to the technical field of power battery production, in particular to a tab turnover qualification detection method and device. Background In the power battery system, pole pieces and diaphragms form a monopole group through a lamination process or a winding process, and the pole group is connected with a cover plate through a pole lug to complete current conduction. The design end is influenced by pursuit trend of the fast battery cell charging performance in the market, the requirement of increasing the number of the lugs on the battery cell by the design end is continuously increased, the generation probability of the lug turnover phenomenon is gradually increased, and the lug turnover detection accuracy becomes an important quality assurance index for guaranteeing the design effectiveness and the product safety. The current tab turnover detection scheme is mainly visual detection, and when the scheme is adopted for logic determination, all required quantization information is presented based on images. Considering that the lug materials are mostly soft materials such as copper, aluminum and the like, and have multilayer superposition characteristics, the image acquisition accuracy is severely interfered by the lug materials, and the accuracy is limited. A tab detection system and method is provided in CN202510269227 patent document. The tab detection system comprises a transmission assembly, an image acquisition mechanism, a control terminal, a rotation mechanism and a control terminal, wherein the transmission assembly is used for transferring a battery cell to a detection station, the image acquisition mechanism and the rotation mechanism are both arranged at the detection station, the control terminal is in communication connection with the transmission assembly, the image acquisition mechanism and the rotation mechanism, the rotation mechanism is used for rotating the battery cell on the detection station under the control of the control terminal so that the battery cell can be switched between a flat position and a suspension position, the image acquisition mechanism is used for acquiring side images of a tab of the battery cell located at the flat position under the control of the control terminal, and acquiring a large-area image of the tab of the battery cell located at the suspension position, and the control terminal is used for determining a tab detection result according to the side images and the large-area image of the tab. The large-area image is interfered by stacking of the tabs, the states of the uppermost and lowermost tabs can be shot only, the turnover phenomenon of the whole tab can not be detected, the side curve image can not avoid the identification interference caused by tab dislocation, tab deformation and tab gradient design, and the batch detection failure risk exists. The patent document CN202510294272 provides a tab detection device and a tab detection method, the tab detection device comprises a support, a bearing structure and a visual detection module, the support is provided with a fixing structure, the fixing structure is used for fixing a battery core body of a bare battery core in the gravity direction, the fixing structure is used for enabling the thickness direction of the battery core body to be parallel to the gravity direction, at least part of the bearing structure is relatively fixed with the support, the bearing structure is used for bearing the bottom surface of the tab, projection is carried out along the gravity direction, at least part of the edge of the tab is arranged outside the edge of the bearing structure, the visual detection module is relatively fixed with the support, the visual detection module is used for detecting the tab, and two tabs of the battery core are respectively supported, so that when the tab detection device is used, the bearing structure can be used for supporting the tab to a more horizontal direction to facilitate detection, the problems of inaccurate size detection and image virtual focus caused by the inclination of the tab are avoided, and detection deviation is reduced. The detection equipment and the detection method are added with the lug supporting device, and the lug is added with external force to assist in shaping, so that the problems of inaccurate size detection, image deficiency and the like caused by tilting of the lug are solved, the judgment indexes of the detection equipment and the detection method are lug color and lug area, interference caused by dislocation of the lug and lug gradient design cannot be avoided, and the improvement effect is limited. CN202510478092 patent document provides a visual detection device of electric core tab, including total frame, total frame has set gradually first manipulator, visual detection mechanism, second manipulator and third manipulator along tool circulation transfer chain