CN117525763A - Layered pole lug of soft-package battery core and bending detection method thereof - Google Patents
Layered pole lug of soft-package battery core and bending detection method thereof Download PDFInfo
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- 238000005452 bending Methods 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims description 27
- 238000003466 welding Methods 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims description 35
- 238000000926 separation method Methods 0.000 claims description 29
- 230000007547 defect Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 230000002146 bilateral effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 241000406668 Loxodonta cyclotis Species 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 8
- 230000035515 penetration Effects 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 230000004927 fusion Effects 0.000 abstract description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/10—Image enhancement or restoration using non-spatial domain filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/187—Segmentation; Edge detection involving region growing; involving region merging; involving connected component labelling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10028—Range image; Depth image; 3D point clouds
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20024—Filtering details
- G06T2207/20028—Bilateral filtering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to the technical field of lithium ion battery grouping application, and solves the technical problems of difficult bending and difficult welding caused by excessive thickness of the existing electrode lugs, in particular to a layered electrode lug of a soft-package battery core, which comprises a layered electrode lug structure welded after being attached to a second busbar after being integrally bent once; the layered tab structure is divided into an inner section of the battery cell connected with the soft-package battery cell through a dividing line, and a layered section welded with the second busbar after bending is welded outside the battery cell, and the layered section welded outside the battery cell forms at least two or more tabs A and B with the thickness less than or equal to 0.3mm through setting a layered gap. The invention can avoid the problems of difficult bending and difficult welding of the tab caused by too thick tab, reduce the grouping difficulty of the high-capacity soft-package battery cells, reduce the possible risk of cold joint and fusion penetration, and has important significance for long-term safe operation of the battery pack.
Description
Technical Field
The invention relates to the technical field of lithium ion battery grouping application, in particular to a layered tab of a soft-package battery core and a bending detection method thereof.
Background
With the demand of the power lithium battery consumer market for energy density, the module and system volume grouping rate is more and more paid attention to, and development of high-capacity battery cells is further promoted, such as 136Ah and even higher-capacity soft package battery cells. However, these cells have a common phenomenon, and in order to exert the high power advantage of the cells, the tabs of the cells are generally made thicker, such as 0.5mm copper tab and 0.6mm aluminum tab. Thicker tabs bring higher difficulty of bending and poor welding, larger bending radius and the like, are inconvenient to group, and the larger bending radius brings additional weight to the module, so that the energy density of the system is reduced. In addition, if the busbar adopts the aluminum product, can adjust the welding power to the copper that can weld 0.5mm when the busbar adopts, very big probably can melt the aluminium busbar of lower floor and wear, cause the inefficacy of module, perhaps carelessly laser spreads to the electric core body even, still can cause more serious accident emergence like thermal runaway, and the result is not can be assumed.
In view of this, a novel tab structure which is compatible with manufacturing, installation and cost is needed, an energy output terminal is provided for a high-capacity soft package battery cell, the high power advantage of the battery cell is exerted, assistance is provided for grouping and industrialization application of the high-capacity soft package battery cell, grouping difficulty is reduced, yield is improved, potential risks are reduced, and long-term safety performance of a system is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a layered tab of a soft-package battery core and a bending detection method thereof, and solves the technical problems of difficult bending and difficult welding caused by the excessive thickness of the existing tab.
In order to solve the technical problems, the invention provides the following technical scheme: a layered tab of a soft-package battery core comprises a layered tab structure which is welded after being attached to a second busbar after being integrally bent once;
the layered tab structure is divided into an inner section of the battery cell connected with the soft package battery cell through a dividing line and an outer local welding layered section of the battery cell welded with the second busbar after bending, wherein the outer local welding layered section of the battery cell forms at least two or more tabs A and tabs B with the thickness less than or equal to 0.3mm by arranging a layered gap, and the outer local welding layered section of the battery cell is integrally bent once at the position of a bending area.
Further, the size of the layering gap is 0.01-0.03mm, and the length of the tab A is larger than that of the tab B.
Further, the inner section of the battery cell is of a single-layer copper sheet structure, and the thickness of the inner section of the battery cell is not less than 0.5mm.
Further, the bending angle between the inner section of the battery cell and the outer partial welding layering section of the battery cell in the bending area is ninety degrees.
The technical scheme also provides a bending detection method applied to the layered electrode lug of the soft-package battery cell, which comprises the following steps:
s1, carrying out pretreatment operation on layered tabs to be detected;
s2, three-dimensional surface point cloud data of layered lugs in a layered section are obtained by adopting a three-dimensional scanner;
s3, fitting a boundary line of the three-dimensional surface point cloud data by using a least square method to determine a detection area;
s4, fitting the contour lines of two or more layers of tabs by adopting a least square method to obtain a plurality of separation lines;
s5, constructing at least two equipotential lines R formed by a plurality of discrete points in the detection area i I represents the ith equipotential line;
s6, judging whether the separation line and the equipotential line have fluctuation phenomenon or not;
if yes, the layering tab to be detected has a bending defect, namely a separation defect and a larger gap defect shown in fig. 4;
if not, ending.
Further, in step S2, the specific process includes the following steps:
s21, randomly selecting three points P in three-dimensional surface point cloud data i 、P i-1 、P i+1 And calculate the point P i Respectively to point P i-1 Sum point P i+1 Is a wiring distance d i ；
Distance d of connecting line i The calculation formula of (2) is as follows:
s22, calculating the connecting line distance d i Distance d from the next line i-1 Then removing points greater than the set threshold D and reordering points in the three-dimensional surface point cloud data;
s23, repeating the steps S21-S22 until all points in the three-dimensional surface point cloud data are processed;
s24, filtering the denoised three-dimensional surface point cloud data by adopting a bilateral filtering method, and calculating a bilateral filtering weight alpha to perform filtering, wherein the formula is as follows:
wherein N (p) i ) For point p i Neighborhood of P i，j For point p i Any point in the neighborhood of the object,representing the passing point p i Normal vector, w c 、w s The filtered points can be calculated by weighting factors related to the distance between the two points and the normal vector angle between the two points
Further, in step S5, the specific process includes the steps of:
s51, selecting a bottom point of the leftmost boundary line of the detection area as a starting point A, constructing a standard line which is mutually perpendicular to the inner section of the battery cell downwards from the starting point A, and setting the standard line to be equal to the leftmost boundary line of the detection area;
s52, using the midpoint of the standard line as a starting point B1, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B1 i ；
S53, using the peak of the standard line as a starting point B2, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B2 i+1 。
Further, in step S6, it is determined whether the separation line and the equipotential line have a fluctuation phenomenon, and the specific process includes the following steps:
s61, selecting equipotential lines R i And equipotential line R i+1 Intersection point coordinates of separation lines corresponding to any tab respectivelyAnd intersection coordinate->
S62, according to the intersection point coordinatesAnd intersection coordinate->Judging whether the separation line changes or not;
if it isAnd->The separation line does not have a fluctuation phenomenon;
if it isThe separation line is subject to a surge phenomenon.
By means of the technical scheme, the invention provides the layered pole ear of the soft-package battery core and the bending detection method thereof, and the layered pole ear has the following beneficial effects:
1. the invention can avoid the problems of difficult bending and difficult welding of the tab caused by too thick tab, reduce the grouping difficulty of the high-capacity soft-package battery cells, reduce the possible risk of cold joint and fusion penetration, and has important significance for long-term safe operation of the battery pack.
2. According to the layered tab design of the soft-packaged battery cell, the soft-packaged battery cell with high capacity and high multiplying power is customized, the outer welding part of the thicker copper-aluminum tab battery cell is subjected to layered structure design, and then bending and welding are sequentially carried out respectively, so that the bending difficulty is reduced, the welding reject ratio is reduced, the potential safety hazard is reduced, the long-term safety reliability of the battery cell is improved, the tab part inside the battery cell is still designed according to the traditional tab structure, the manufacturing is simple, the operation is easy, the manufacturing difficulty of the extra battery cell is not increased, the application scene of the soft-packaged battery cell is expanded, and the layered tab design has great significance for the industrial application of the soft-packaged battery cell with high capacity and high multiplying power.
3. The detection method provided by the invention can accurately detect and identify the phenomenon of separation or larger interval among the multi-layer lugs, not only can rapidly select the layered lugs with bending defects, but also can ensure that the shape of each layer of lugs after bending is close to ninety degrees, thereby avoiding the phenomena of exposure, missing welding and false welding of individual lugs in the arrangement and connection process with the busbar, ensuring that the multi-layer lugs can be kept in the same-direction regular arrangement state after being bent once, and further reducing the welding difficulty and welding reject ratio.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic view of a conventional soft package battery tab structure according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a layered tab structure of a soft-package battery cell according to an embodiment of the invention;
FIG. 3 is a schematic view of a layered tab structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a bending defect in a second embodiment of the present invention;
FIG. 5 is a flowchart of a bending detection method according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a bending detection method according to a second embodiment of the invention.
In the figure:
1-001, electrode lugs; 1-002, a first busbar;
2-001, layered tab structure; 011. an inner section of the cell; 012. the outside of the battery cell is locally welded with a layering section; 013. a dividing line; 014. layering gaps; 015. a pole ear A; 016. a tab B; 017. a bending region;
2-002, a second busbar.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. Therefore, the implementation process of how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Example 1
As shown in FIG. 1, the thickness of the tab 1-001 is 0.5mm, and the tab 1-001 is welded after being attached to the first busbar 1-002 after being integrally bent once, and as the thickness of the tab 1-001 is thicker, especially for the copper tab of the cathode, the hardness of the tab is higher, and the greater thickness must bring greater difficulty to bending, firstly, the bending radius is larger, the occupation ratio of the non-effective part of the unnecessary tab 1-001 is increased, the unnecessary cell weight is increased, and additional load is brought to the system. And secondly, the bending difficulty is high, and the risk of root involvement is increased when the tab 1-001 is bent, so that the risk of failure of the battery cell is increased. The thickness of the electrode lugs 1-001 is thicker, so that the electrode lugs are unfavorable for welding and are easy to cause cold joint. In addition, if the busbar adopts the aluminum product, can adjust the welding power to the copper that can weld 0.5mm when the busbar adopts, very big probably can melt the aluminium busbar of lower floor and wear, cause the inefficacy of module, perhaps carelessly laser spreads to the electric core body even, still can cause more serious accident emergence like thermal runaway, and the result is not can be assumed.
Based on the technical defects of the conventional soft-covered battery cell tab structure, please refer to fig. 2-3, a specific implementation manner of the embodiment is shown, which is used for solving the technical problem that the conventional soft-covered battery cell tab structure is unfavorable for bending and welding, the embodiment adopts layered tab design, is customized for the high-capacity and high-multiplying power soft-covered battery cell, performs layered structural design on the external welding part of the thicker copper-aluminum tab battery cell, and then sequentially bends and welds the external welding part, thereby reducing bending difficulty, reducing welding failure rate, reducing potential safety hazards, improving long-term safety and reliability of the battery cell, ensuring that the tab part inside the battery cell is still designed according to the conventional tab structure, and has the advantages of simple manufacture, easy operation, no additional battery cell manufacturing difficulty, expanding the application scene of the soft-covered battery cell, and great significance for industrial application of the high-capacity and high-multiplying power soft-covered battery cell.
Referring to fig. 2, the present embodiment provides a layered tab of a soft-package battery cell, which is characterized by comprising a layered tab structure 2-001 welded after being integrally bent once and attached to a second busbar 2-002, and the present embodiment can avoid the problems of difficult bending and difficult welding of the tab caused by too thick tab by adopting the layered tab structure 2-001, thereby reducing the grouping difficulty of the soft-package battery cell with high capacity, reducing the risk of false welding and penetration, and having important significance for long-term safe operation of the battery pack.
Referring to fig. 3, the layered tab structure 2-001 is divided into a battery core inner section 011 connected with the soft package battery core through a dividing line 013, and a battery core outer part local welding layered section 012 used for welding with the second bus bar 2-002 after bending, the traditional tab 1-001 is divided into the battery core inner section 011 and the battery core outer part local welding layered section 012, the battery core inner section 011 is not different from the traditional soft package battery core inner section, so that extra processing and manufacturing difficulty is not brought to the battery core, the battery core tab is replaced by a layered structure tab when the battery core tab is fed, the realization is simple and easy, the battery core outer part local welding layered section 012 forms at least two or more than two tabs A015 and B016 with the thickness less than or equal to 0.3mm after bending, the layered layer is determined by the total thickness of the tab 1-001, the thickness of each tab is more favorable for bending and welding, the total thickness of the tab is not more than 0.5mm, the tab is divided into two layers, the tab thickness of the tab is not more than the thickness of the tab 1-001 after bending, the tab 1-001 is bent, the necessary bending system is avoided, and the bending system is greatly increased, and the bending system is not necessary, and the bending system is increased; after the electrode lugs 1-001 are layered, welding is sequentially carried out according to the number of layered layers, so that high welding reject ratio caused by thicker electrode lugs 1-001 can be effectively reduced, and the welding reject ratio comprises false welding, penetration and the like.
The novel tab structure with the layered tab structure provided by the embodiment has the advantages of manufacturing, mounting and cost, provides an energy output terminal for the high-capacity soft-package battery core, exerts the high-power advantage of the battery core, provides assistance for grouping and industrialization application of the high-capacity soft-package battery core, reduces grouping difficulty, improves yield, reduces potential risks and improves long-term safety performance of the system.
The layered tab is thinned, which is more beneficial to bending and welding; the bending radius of the thicker lug is effectively reduced, unnecessary system weight increase is avoided, and the energy density of the system is improved; the high welding reject ratio caused by thicker lugs can be effectively reduced, including cold joint, penetration and the like; the high power advantage of the high capacity and high multiplying power battery core can be exerted.
The size of the layering gap 014 is 0.01-0.03mm, the length of the tab A015 is larger than that of the tab B016, the layering gap 014 is used for dividing the external partial welding layering section 012 of the battery core of the single-layer copper sheet into two or more tabs A015 and B016 or C and D, and the like, the thickness of the divided tabs is less than or equal to 0.3mm, and meanwhile, the layering gap 014 also plays a role in bonding the two or more tabs to each other, namely, the tab A015 and the tab B016 are always kept in an equipotential state through a tiny gap and are tightly attached to each other, the bending radius is reduced, the stress of a bending region 017 is reduced, cracks in the bending region 017 are avoided, and the bending and welding difficulty is reduced. The inner section 011 of the battery cell is of a single-layer copper sheet structure, and the thickness of the inner section 011 of the battery cell is not less than 0.5mm. The bending angle between the cell inner section 011 and the cell outer partial weld laminate section 012 at the bending region 017 is ninety degrees.
Based on the layered tab structure of the soft-package battery core, the industrialized application of the soft-package battery core with high capacity and high multiplying power can be assisted, meanwhile, the traditional manufacturing process route of the soft-package battery core is not changed, the application scene of the soft-package battery core is improved, and the potential safety hazard left in the group welding process of the soft-package battery core with high capacity and high multiplying power is reduced.
By the implementation method, the high-capacity battery cell lugs can be easily welded and grouped, the practical grouping application difficulty is reduced, and meanwhile, the cost, the manufacturing and the mounting process are considered. The high-power soft package battery cell is customized for the high-capacity and high-multiplying power soft package battery cell, the advantage of high power of the soft package battery cell is exerted, the outer welding part of the thicker copper-aluminum electrode lug battery cell is designed in a layered structure, and then the thicker copper-aluminum electrode lug battery cell is respectively bent and welded, so that the bending difficulty is reduced, the welding reject ratio is reduced, the long-term safety reliability of the battery cell is improved, the electrode lug part inside the battery cell is still designed according to the traditional electrode lug structure, the manufacturing difficulty of the additional battery cell is not increased, and the method has important significance for the industrial application of the high-capacity and high-multiplying power soft package battery cell.
Example two
In this embodiment, since the number of layers of the layered tab structure is more than two, when the tabs of the layered tab structure are folded together, a phenomenon that the tabs of the multiple layers are separated or separated greatly occurs under the action of a folding force, as shown in fig. 4, and a serious defect is caused in the subsequent connection with the busbar due to the large spacing between the tabs of the multiple layers or direct separation, so that the phenomena of partial tab exposure, missing welding and cold welding are easily caused, and the difficulty of a welding procedure and the welding failure rate are improved.
Referring to fig. 5 and 6, the present embodiment provides a method for detecting bending of a layered tab of a soft-package battery core, for detecting whether a bending defect exists in the layered tab structure, the method includes the following steps:
s1, carrying out pretreatment operation on layered tabs to be detected, wherein in the step, the pretreatment operation needs to adjust the positions of the layered tabs to be detected through a vibration disc, so that one end of a local welding layered section outside a battery cell faces upwards, simultaneously, carrying out continuous conveying on a plurality of layered tabs at a certain interval by matching with a belt conveyor, detecting each layered tab in the conveying process, and acquiring point cloud data of the local welding layered section outside the battery cell by a three-dimensional scanner, wherein the positions are convenient for a three-dimensional scanner, as shown in FIG. 4.
S2, three-dimensional surface point cloud data of layered electrode lugs in a layered section are obtained by adopting a three-dimensional scanner, denoising and filtering are carried out on the three-dimensional surface point cloud data, the three-dimensional surface point cloud data refer to a view angle as shown in fig. 4, and one side of the layered electrode lug is scanned and collected to obtain point cloud data in a displacement two-dimensional plane, and the obtained point cloud data is projected into the plane under the two-dimensional coordinate system, so that the collection amount of the point cloud data can be greatly reduced by only collecting the point cloud data on one side of the layered electrode lug, the processing efficiency of the point cloud data is improved, and the calculation amount is reduced. In step S2, the specific process includes the following steps:
s21, randomly selecting three points P in three-dimensional surface point cloud data i 、P i-1 、P i+1 And calculate the point P i Respectively to point P i-1 Sum point P i+1 Is a wiring distance d i ；
Distance d of connecting line i The calculation formula of (2) is as follows:
s22, calculating the connecting line distance d i Distance d from the next line i-1 Then removing points greater than a set threshold D, which in this embodiment takes a value of 0.1-0.3, and reordering points in the three-dimensional surface point cloud data;
s23, repeating the steps S21-S22 until all points in the three-dimensional surface point cloud data are processed;
s24, filtering the denoised three-dimensional surface point cloud data by adopting a bilateral filtering method, wherein in the embodiment, the filtering is performed by calculating a bilateral filtering weight alpha, and the formula is as follows:
wherein N (p) i ) For point p i Neighborhood of P i，j For point p i Any point in the neighborhood of the object,representing the passing point p i Normal vector, w c 、w s The filtered points can be calculated by weighting factors related to the distance between the two points and the normal vector angle between the two points
In this embodiment, noise points existing in the acquired point cloud data can be eliminated by denoising and filtering the three-dimensional surface point cloud data, so that the definition of the local welding layered segment contour line outside the whole cell is improved, and the subsequent fitting of a detection area and a separation line is facilitated.
S3, adopting a least square method to fit boundary lines of the three-dimensional surface point cloud data to determine a detection area, adopting a prior art means to fit the boundary lines in the three-dimensional surface point cloud data, wherein the boundary lines are side lines of a local welding layering section outside the battery cell as shown in FIG. 6, and the area formed by all the side lines is the detection area.
S4, fitting the contour lines of two or more layers of tabs by adopting a least square method to obtain a plurality of separation lines, wherein in the step, the contour lines of the multi-layer tabs in the detection area are fitted by adopting a prior art means to obtain the number of layers of layered tabs and the contour line of each layer of tab, as shown in FIG. 6, the contour line of each layer of tab is clearly visible, and the process is the prior art means and is not repeated in detail.
S5, constructing at least two equipotential lines R formed by a plurality of discrete points in the detection area i I represents the ith equipotential line; in step S5, the specific process includes the following steps:
s51, selecting a bottom point of the leftmost boundary line of the detection area as a starting point A, constructing a standard line which is mutually perpendicular to the inner section of the battery cell downwards from the starting point A, and setting the standard line to be equal to the leftmost boundary line of the detection area;
s52, using the midpoint of the standard line as a starting point B1, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B1 i ；
S53, using the peak of the standard line as a starting point B2, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B2 i+1 。
In this step, as shown in FIG. 6, at least two equipotential lines of discrete points are established along the main direction at the selected point on the standard line, wherein the discrete points are a line of discrete points, and the coordinates of the discrete points covered on the equipotential lines are known, for example, on the equipotential line R i The coordinates of discrete points on the graph can be expressed as R i，j (x j ，y j ) J represents the j-th discrete point, so in this method, the equipotential lines are established so that at least and only one discrete point intersects the separation line, thereby obtaining the coordinates of the intersection point.
S6, judging whether the separation line and the equipotential line have fluctuation phenomenon or not;
if yes, the layering tab to be detected has a bending defect, namely a separation defect and a larger gap defect shown in fig. 4;
if not, ending.
In step S6, it is determined whether the separation line and the equipotential line have a fluctuation phenomenon, and the specific process includes the following steps:
s61, selecting equipotential lines R i And equipotential line R i+1 Intersection point coordinates of separation lines corresponding to any tab respectivelyAnd intersection coordinate->
S62, according to the intersection point coordinatesAnd intersection coordinate->Judging whether the separation line changes or not;
if it isAnd->The separation line does not have a fluctuation phenomenon;
if it isThe separation line is subject to a surge phenomenon.
In the method, two or more equipotential lines are established, two intersection points intersecting with the same separation line are selected on the premise of knowing the coordinates of discrete points, namely the coordinates of the two discrete points, and whether the horizontal coordinates of the two intersection points on the X axis are identical or within an allowable value interval [0.01,0.06] is compared, so that the tab corresponding to the separation line is not provided with bending defects, and otherwise, the tab is provided with bending defects.
According to the embodiment, whether bending defects occur after bending the laminated tab structure or not can be detected and identified accurately, the laminated tabs with bending defects can be selected out rapidly, the mode of each layer of tab after bending is guaranteed to be close to ninety degrees, the phenomena of exposure, missing welding and virtual welding are avoided in the arrangement and connection process of the individual tabs and the bus bar, the situation that the laminated tabs can be kept in the same-direction regular arrangement state after being bent once is guaranteed, and then welding difficulty and welding reject ratio are reduced.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in a method of implementing an embodiment described above may be implemented by a program to instruct related hardware, and thus the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing embodiments have been presented in a detail description of the invention, and are presented herein with a particular application to the understanding of the principles and embodiments of the invention, the foregoing embodiments being merely intended to facilitate an understanding of the method of the invention and its core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (8)
1. The soft-package battery core layered electrode lug is characterized by comprising a layered electrode lug structure (2-001) which is welded after being attached to a second busbar (2-002) after being integrally bent once;
the battery cell is characterized in that the layered tab structure (2-001) is divided into a battery cell inner section (011) connected with the soft package battery cell through a dividing line (013), and a battery cell outer part local welding layered section (012) welded with the second bus bar (2-002) after bending, the battery cell outer part local welding layered section (012) forms at least two or more tabs A (015) and B (016) with thickness less than or equal to 0.3mm through a layered gap (014), and the battery cell outer part local welding layered section (012) is integrally bent at the position of the bending region (017) once.
2. The soft pack cell layered tab of claim 1, wherein the size of the layered gap (014) is 0.01-0.03mm, and the length of tab a (015) is greater than the length of tab B (016).
3. The soft-pack cell layered tab of claim 1, wherein the cell inner section (011) is of a single-layered copper sheet structure, and the thickness of the cell inner section (011) is not less than 0.5mm.
4. The soft pack cell layered tab of claim 1 wherein the bend angle between the cell inner section (011) and the cell outer partially welded layered section (012) at the bend region (017) is ninety degrees.
5. The bending detection method applied to the layered tab of the soft-package battery cell of any one of claims 1-4 is characterized by comprising the following steps:
s1, carrying out pretreatment operation on layered tabs to be detected;
s2, three-dimensional surface point cloud data of layered lugs in a layered section are obtained by adopting a three-dimensional scanner;
s3, fitting a boundary line of the three-dimensional surface point cloud data by using a least square method to determine a detection area;
s4, fitting the contour lines of two or more layers of tabs by adopting a least square method to obtain a plurality of separation lines;
s5, constructing at least two equipotential lines R formed by a plurality of discrete points in the detection area i I represents the ith equipotential line;
s6, judging whether the separation line and the equipotential line have fluctuation phenomenon or not;
if yes, bending defects exist in the layered tab to be detected;
if not, ending.
6. The bending detection method according to claim 5, wherein in step S2, the specific process includes the steps of:
s21, randomly selecting three points P in three-dimensional surface point cloud data i 、P i-1 、P i+1 And calculate the point P i Respectively to point P i-1 Sum point P i+1 Is a wiring distance d i ；
Distance d of connecting line i The calculation formula of (2) is as follows:
s22, calculating the connecting line distance d i Distance d from the next line i-1 Then removing points greater than the set threshold D and reordering points in the three-dimensional surface point cloud data;
s23, repeating the steps S21-S22 until all points in the three-dimensional surface point cloud data are processed;
s24, filtering the denoised three-dimensional surface point cloud data by adopting a bilateral filtering method.
7. The bending detection method according to claim 5, wherein in step S5, the specific process includes the steps of:
s51, selecting a bottom point of the leftmost boundary line of the detection area as a starting point A, constructing a standard line which is mutually perpendicular to the inner section of the battery cell downwards from the starting point A, and setting the standard line to be equal to the leftmost boundary line of the detection area;
s52, using the midpoint of the standard line as a starting point B1, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B1 i ；
S53, using the peak of the standard line as a starting point B2, and defining an equipotential line R consisting of a plurality of discrete points along the main direction of the inner section of the cell by using the starting point B2 i+1 。
8. The method according to claim 5, wherein in step S6, it is determined whether the separation line and the equipotential line have a wave phenomenon, and the specific process includes the steps of:
s61, selecting equipotential lines R i And equipotential line R i+1 Intersection point coordinates of separation lines corresponding to any tab respectivelyAnd intersection coordinate->
S62, according to the intersection point coordinatesAnd intersection coordinate->Judging whether the separation line changes or not;
if it isAnd->No fluctuation of the separation line occursAn elephant;
if it isThe separation line is subject to a surge phenomenon.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012005140A1 (en) * | 2010-07-05 | 2012-01-12 | 株式会社トプコン | Point cloud data processing device, point cloud data processing system, point cloud data processing method, and point cloud data processing program |
| CN106099020A (en) * | 2016-08-24 | 2016-11-09 | 宁德时代新能源科技股份有限公司 | Soft package battery pack |
| CN208955084U (en) * | 2018-09-28 | 2019-06-07 | 桑顿新能源科技有限公司 | A kind of power battery tab, busbar connector welding structure and power battery module |
| CN111540872A (en) * | 2020-05-12 | 2020-08-14 | 远景动力技术(江苏)有限公司 | Non-bus battery module, non-bus battery module assembling method and battery pack |
| CN111754462A (en) * | 2020-05-28 | 2020-10-09 | 新拓三维技术(深圳)有限公司 | Visual detection method and system for three-dimensional bent pipe |
| CN111879235A (en) * | 2020-06-22 | 2020-11-03 | 杭州思看科技有限公司 | Three-dimensional scanning detection method and system for bent pipe and computer equipment |
| CN215578966U (en) * | 2021-05-18 | 2022-01-18 | 恒大新能源技术(深圳)有限公司 | Power battery three-layer tab welding structure |
| CN217719890U (en) * | 2022-07-22 | 2022-11-01 | 江苏正力新能电池技术有限公司 | Electrode member and battery cell |
| CN218448175U (en) * | 2022-08-16 | 2023-02-03 | 欣旺达电子股份有限公司 | Tab, battery core and battery |
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
| CN116934736A (en) * | 2023-08-10 | 2023-10-24 | 仙芈智造科技(蚌埠)有限公司 | Defect detection method, system and storage medium for chip packaging |
-
2023
- 2023-11-08 CN CN202311479599.7A patent/CN117525763B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012005140A1 (en) * | 2010-07-05 | 2012-01-12 | 株式会社トプコン | Point cloud data processing device, point cloud data processing system, point cloud data processing method, and point cloud data processing program |
| CN106099020A (en) * | 2016-08-24 | 2016-11-09 | 宁德时代新能源科技股份有限公司 | Soft package battery pack |
| CN208955084U (en) * | 2018-09-28 | 2019-06-07 | 桑顿新能源科技有限公司 | A kind of power battery tab, busbar connector welding structure and power battery module |
| CN111540872A (en) * | 2020-05-12 | 2020-08-14 | 远景动力技术(江苏)有限公司 | Non-bus battery module, non-bus battery module assembling method and battery pack |
| CN111754462A (en) * | 2020-05-28 | 2020-10-09 | 新拓三维技术(深圳)有限公司 | Visual detection method and system for three-dimensional bent pipe |
| CN111879235A (en) * | 2020-06-22 | 2020-11-03 | 杭州思看科技有限公司 | Three-dimensional scanning detection method and system for bent pipe and computer equipment |
| CN215578966U (en) * | 2021-05-18 | 2022-01-18 | 恒大新能源技术(深圳)有限公司 | Power battery three-layer tab welding structure |
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
| CN217719890U (en) * | 2022-07-22 | 2022-11-01 | 江苏正力新能电池技术有限公司 | Electrode member and battery cell |
| CN218448175U (en) * | 2022-08-16 | 2023-02-03 | 欣旺达电子股份有限公司 | Tab, battery core and battery |
| CN116934736A (en) * | 2023-08-10 | 2023-10-24 | 仙芈智造科技(蚌埠)有限公司 | Defect detection method, system and storage medium for chip packaging |
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|---|---|
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