CN116038153A - Method for cutting lithium battery tab by laser - Google Patents

Method for cutting lithium battery tab by laser Download PDF

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Publication number
CN116038153A
CN116038153A CN202310084548.8A CN202310084548A CN116038153A CN 116038153 A CN116038153 A CN 116038153A CN 202310084548 A CN202310084548 A CN 202310084548A CN 116038153 A CN116038153 A CN 116038153A
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China
Prior art keywords
arc
tab
bot
laser
lug
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Inventor
罗伟森
黎振升
黄道平
谢志文
刘少君
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN202310084548.8A priority Critical patent/CN116038153A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/083—Devices involving movement of the workpiece in at least one axial direction
    • B23K26/0853—Devices involving movement of the workpiece in at least in two axial directions, e.g. in a plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a method for cutting lithium battery lugs by laser, which comprises the following steps: based on the size and shape of the tab to be cut, parameters of the tab, the shape of the tab is selected, and the speed of the tab is set; calculating the step length in the XY direction as track precision, calculating the number of single-chip tab data segments and an offset value to be overlapped with one step length in the track, and generating corresponding tab movement track data; dividing the whole track into different parts according to different lug materials, and independently setting laser parameters in each part to generate laser energy parameter data of the lug; cutting square with the size, respectively measuring the size of each millimeter of the XY direction of the interval, manufacturing corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at the final coordinate production position; and loading the compensated data into a motion control card, starting a material belt, enabling the pole piece to be cut to move, and controlling the moving speed of laser cutting to dynamically change along with the speed of the conveying belt according to the return value of the encoder.

Description

Method for cutting lithium battery tab by laser
Technical Field
The invention relates to the technical field of lithium battery tab processing, in particular to a method for cutting lithium battery tabs by laser.
Technical Field
With the development of new energy automobiles and other mobile equipment, the application market of lithium batteries is rapidly developed, and the lithium batteries become the most important product in the current battery products. Along with the increasingly serious world problems of energy crisis, environmental pollution and the like, the lithium ion battery occupies a considerable market share by virtue of the characteristics of high working voltage, large specific energy, small volume, light weight, long cycle life, low self-discharge rate, no memory effect, no pollution and the like.
The laser cutting area of the traditional laser cutting mode is larger, and the light path of laser is along the route after the tab is formed. The stability of the material belt is seriously affected due to the shake of the material belt generated by high-speed laser cutting, and then the cutting precision and efficiency of the tab are affected. The cutting mode is fixed, and the cutting shape cannot be changed online (a laser flaking method for the lithium battery pole piece).
However, the pole piece is taken as the basis of the whole lithium ion battery manufacture, harsh conditions are provided for the pole piece manufacturing equipment and manufacturing method, good performance is required, and high requirements on precision, stability, flexibility, production efficiency and the like are provided.
Disclosure of Invention
Aiming at the defects, the invention provides a method for cutting the electrode lugs of the lithium battery by laser, and the size and the type of the electrode lugs can be changed online by setting different electrode lug size parameters and different electrode lug shape parameters; different laser energy areas are divided according to the material of the pole piece, so that the generation of burrs of the pole piece is effectively reduced, and the loss of laser energy is reduced; the measured compensation data is used for compensating the distortion caused by the mechanical structure of the vibrating mirror, so that the cutting precision of the lug is effectively improved; through setting up utmost point ear speed multiplying power parameter, compressed the effective cutting area of laser in X direction for anti-shake mechanical part can successfully install in the processing plane front end, has greatly reduced the shake of material area, thereby improves the cutting accuracy of utmost point ear.
The invention is realized at least by one of the following technical schemes.
A method for cutting lithium battery lugs by laser is used for finishing cutting of various lug shapes; the whole tab graph is segmented, different speed proportion setting and laser parameter setting can be carried out according to the subdivision path segment, and the method comprises the following steps:
s1, setting shape and size parameters of a pole piece to be cut, and setting a pole lug speed proportion according to the selected shape and size parameters;
s2, calculating the step length in the Y direction and the step length in the X direction according to the track precision and the tab speed proportion, calculating the number of single-sheet tab data segments according to the total length of the single-sheet tab and the track precision, and calculating the offset value to be overlapped of one step length in the track according to the total length of the pole pieces and the number of the data segments to generate tab movement track data;
s3, respectively setting laser energy parameter power and frequency of a lug top part, a lug height part, a thinned part and a base material part, and generating lug laser energy parameter data;
s4, cutting a square with a certain size in a static state of the material belt, respectively measuring the sizes of the material belt in the X and Y directions at intervals of each millimeter to manufacture corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at a final coordinate production position;
s5, loading data to a motion control card, starting a conveyor belt to enable a pole piece to be cut to move, and controlling the laser cutting speed to dynamically change along with the speed of the conveyor belt according to the return pulse of an encoder;
s6, starting the system to control the laser to periodically cut the movable pole piece on the processing plane.
Further, the pole piece to be cut comprises a common pole lug, an opposite pole lug and a positioning hole.
Further, the dimension parameter comprises the total length L of the single pole piece, the bottom width M of the pole lug and the height H of the pole lug 2 The bottom fillet r_bot on the right side of the tab, the top fillet r_top on the right side of the tab, the top fillet l_top on the left side of the tab and the bottom fillet l_bot on the left side of the tab;
the dimension parameter in front of the counter-tab includes the counter-tab horizontal distance W f Reverse and reverse directionHeight H of polar earlobe f Arc diameter D of counter electrode lug f Radius R of bottom arc of counter electrode f ；
The dimension parameters in front of the lug of the positioning hole comprise the horizontal distance W of the positioning hole d Vertical distance H of positioning holes d Circular arc diameter D of positioning hole d The vertical length F of the positioning hole;
the dimension parameter in the tab does not need to be set with a horizontal distance W f Or W d 。
Further, according to the track precision P and the tab speed proportion R, calculating the step length in the Y direction:
S y ＝P*R
step size in X direction:
S x ＝P
dividing the total length T of the single lug into X-direction lengths T x And Y-direction length T y Calculating the number S of single-chip tab data segments:
S＝T x /S x +T y /S y
and calculating an offset value O to be overlapped of one step length in the track according to the total length L of the pole pieces and the number S of the data segments:
O＝S/L
and superposing offset values O on each given x-coordinate point position to generate tab movement track data.
Further, calculating the coordinates of a right bottom arc segment by taking the right bottom arc of the tab as a starting point:
x_rb＝x_arc_rb-r_bot*sin(m*angle_arc_rb)
y_rb＝y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))
wherein r_bot represents the radius of the bottom fillet on the right side of the tab, x and y are the coordinates of the current point location, x_arc_rb and y_arc_rb are the starting points of the bottom right arc, and are defined as (0, 0), namely:
x_arc_rb＝0，y_arc_rb＝0
m is the current segment number of the right bottom arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom arc, and the value of the radian is represented by the single step length S x And the right bottom arc radius r_bot:
angle_arc_rb＝S x /r_bot
calculating the coordinates of the right section of the height of the tab:
y_rh＝y+S y
wherein S is x 、S y A step length in the X direction and a step length in the Y direction are expressed;
calculating the coordinates of the right top arc segment:
x_rt＝x_arc_rt-(r_top-r_top*cos(m*angle_arc_rt*R))
y_rt＝y_arc_rt+r_top*sin(m*angle_arc_rt*R)
wherein, r_top represents the radius of the top fillet on the right side of the tab, and R represents the tab speed ratio as follows:
x_arc_rt＝-r_bot，y_arc_rt＝H 2 -r_top
single step arc of right top arc starting point:
angle_arc_rt＝S x /r_top
calculating the top linear coordinates of the tab:
x_t＝x-S x
calculating the coordinates of the left top arc segment:
x_lt＝x_arc_lt-l_top*sin(m*angle_arc_lt*R)
y_lt=y_arc_lt- (l_top-l_top_cos (m angle_arc_lt R)) where l_top represents the radius of the top fillet on the left side of the tab, the start of the left top arc:
x_arc_lt＝-M+l_top+l_bot，y_arc_lt＝H 2
single step arc of the left top arc starting point:
angle_arc_lt＝S x /l_top
calculating the left segment coordinates of the height of the tab:
y_lh＝y_lt-S y
calculating the left bottom arc segment coordinates:
x_lb＝x_arc_lb-(l_bot-l_bot*cos(m*angle_arc_lb))
y_lb＝y_arc_lb-l_bot*sin(m*angle_arc_lb))
wherein, l_bot represents the radius of the bottom fillet at the left side of the tab, and the starting point of the left bottom arc:
x_arc_lb= -m+l_bot, y_arc_lb = l_bot single step radians of the start of the left bottom arc:
angle_arc_lb＝S x /l_bot
calculating the bottom linear coordinates of the polar lug:
x_b＝x_lb-S x
based on the theoretical coordinate point positions, an offset value O is superimposed on each x original coordinate:
x offset of deflection ＝x Original source +O*n
Wherein n is the current tab segment number of the single tab.
Further, the laser power W of the tab top portion A is set A Frequency P A The method comprises the steps of carrying out a first treatment on the surface of the Laser power W of tab height portion B B Frequency P B Laser power W of left thinned portion C CL Frequency P CL And right skived portion C laser power W CR Frequency P CR The method comprises the steps of carrying out a first treatment on the surface of the Substrate portion D laser power W D Frequency P D And generating tab laser energy parameter data.
Further, the laser power W of the tab top A is set A Frequency P A ：
W＝W A ,P＝P A H 2 ≤y
Wherein W, P represents the power and frequency of the current coordinate point; h 2 The height of the electrode lug; y is the coordinate value of the current position;
laser power W for setting tab height portion B B Frequency P B ：
W＝W B ,P＝P B H C +H D ≤y≤H 2
Wherein H is C The thinning height is represented by the length of the area of the tab material from the coating material to the aluminum foil material; h D Indicating the substrate height, meaning the length of the coating material above the base line of the bottom of the pole ear;
laser power W for setting left-thinned part C of tab CL Frequency P CL ：
W＝W CL ,P＝P CL H D ≤y≤H C +H D ,x＝-M+l_bot
Wherein M represents the bottom width of the lug, and l_bot represents the radius of the bottom fillet at the left side of the lug;
laser power W for setting tab right thinned portion C CR Frequency P CR ：
W＝W CR ,P＝P CR H D ≤y≤H C +H D ,x＝-r_bot
Setting the laser power W of the lug base material part D D Frequency P D ：
W＝W D ,P＝P D y≤H D 。
Further, in a state that the material belt is stationary, cutting square shapes with corresponding sizes, respectively measuring the size of X, Y directions of intervals of every millimeter, manufacturing corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at a final coordinate production position.
Further, the speed of the laser cut is controlled to dynamically vary with the speed of the conveyor belt based on the return pulse of the encoder.
Further, the cut pole piece is movable, and the laser is controlled to periodically cut the movable pole piece on the processing plane
Compared with the prior art, the invention has the beneficial effects that:
the method is simple and practical, the size and the shape of the lug can be changed online by setting different lug size parameters and shape parameters, the cutting of four right-angle lugs, four-round-angle lugs, top straight-bottom round, top round-bottom straight, reverse lugs, positioning holes and other lug shapes can be realized, and different production requirements can be met. The method effectively solves the problems that the cut pole piece is also moved rapidly simultaneously when laser marking is performed rapidly, distortion errors caused by the structure of the vibrating mirror, the laser marking speed is changed dynamically along with the moving speed of the material belt, the anti-shake firmware is ensured to be installed through compressing the cutting range, and the like. The method is high in originality, no other auxiliary equipment or auxiliary software is needed, and the algorithm is easy to realize. In the method, other interpolation algorithms are not needed in the process of cutting the tab.
The invention realizes laser cutting by sectionally giving tab coordinates, effectively realizes on-line conversion methods of various parameters and various shapes, and a user can cut out a desired tab by only setting different tab size parameters and tab speed ratios on software and selecting the tab shape to be cut.
The invention provides a cutting scheme for the lithium battery tab laser cutting machine, prevents the material belt from shaking, and ensures the precision of the tab. The method disclosed by the invention relates to segmentation of the laser energy parameters of the given tab, so that the situation of the processed tab burr in the tab cutting process is greatly reduced, and the waste of laser energy in the tab cutting process is also reduced.
Drawings
FIG. 1 is a diagram illustrating parameters of the size of a tab of the conventional shape in example 1;
fig. 2 is a diagram illustrating tab size parameters of the inverted tab shape in example 2;
FIG. 3 is a diagram illustrating the parameters of the tab size of the positioning hole in embodiment 3;
FIG. 4 is an illustration of the different laser energy regions divided according to the material of the pole piece;
FIG. 5 is an illustration of the dimensions of a double-sided tab cut from a single piece coating;
FIG. 6 is a flowchart of a method for laser cutting lithium battery tabs in an embodiment of the invention
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Based on the examples herein, other embodiments are within the scope of the present invention as would be appreciated by one of ordinary skill in the art without undue burden.
The invention discloses a method for cutting lithium battery lugs by laser, which comprises the following steps: setting corresponding parameters on a tab parameter setting interface based on the size and shape of a tab to be cut, selecting any tab shape of a conventional tab, an opposite tab and a positioning hole, and setting a proper tab speed ratio according to the selected shape; calculating the step length in the Y direction according to the track precision and the tab speed ratio, wherein the step length in the X direction is the track precision, calculating the number of data segments of a single tab according to the total length of the single tab and the track precision, and calculating the offset value to be overlapped of one step length in the track according to the total length of the pole piece and the number of data segments, thereby generating corresponding tab movement track data; dividing the whole track into a lug top part, a lug height part, a thinned part and a base material part according to different lug materials, and independently setting laser parameters in each part to generate laser energy parameter data of the lug; cutting a square with a certain size in a static state of the material belt, respectively measuring the size of each millimeter of interval in the X and Y directions to manufacture corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at a final coordinate production position; loading the compensated data into a motion control card, starting a material belt, enabling a pole piece to be cut to move, and controlling the moving speed of laser cutting to dynamically change along with the speed of a conveyor belt according to the return value of an encoder; and clicking to start, so that the laser can be controlled to periodically cut the moving pole piece on the processing plane.
Example 1
The embodiment of the present embodiment can be used in a conventional-shaped tab laser cutting method for a lithium battery tab laser cutting machine, as shown in fig. 1, which is a dimensional parameter specification diagram of a conventional-shaped common tab, as shown in fig. 4, which is a specification diagram of different laser energy regions according to the material division of a pole piece, wherein a represents a tab top portion, B represents a tab height portion, C represents a tab thinned portion and D represents a tab base material portion, and fig. 5 is a double-sided tab dimensional specification diagram cut by single-piece coating, wherein W1 represents a tab pitch, W2 represents a tab width, H1 represents a slurry protrusion height, H2 represents a tab height, L1 represents a coating width, and fig. 6 is a specific step method flowchart of the embodiment, which contains the following specific embodiments.
Specifically, as shown in fig. 1, the four corners of the top and bottom of the tab can be set as right angles or rounded angles according to the needs, no positioning holes or counter tabs are provided, and tab parameter sub-window inputs in the tab parameter setting window correspond toThe tab parameters of (2) include total length L of the pole piece, bottom width M of the pole piece and height H of the pole piece 2 Left bottom corner radius l_bot, left top corner radius l_top, right bottom corner radius r_bot, right top corner radius r_top. And setting a proper tab speed ratio so that tab coordinates are limited in the processing range of the anti-shake firmware.
Specifically, in order to reduce the shake of the material belt in the high-speed transmission process, an anti-shake firmware is arranged between the vibrating mirror and the processing plane, so that the shake of the material belt can be effectively reduced. However, due to the mechanical structure of the anti-shake firmware itself, the originally wide laser cutting range is compressed to be long, and the compressed coordinate direction is the X range, so that a tab speed ratio R needs to be set, and when the coordinate in the Y direction is walked, the step length is R times of the X direction, that is, the laser speed in the Y direction is R times of the X direction. The speed ratio R can be dynamically adjusted on the UI interface, so that the time required for walking the same Y-direction path is shortened, the offset value in the X direction is reduced, the processing range in the X direction is successfully compressed, and the step length in the X direction is kept to be single-step precision P. Calculating the step length in the Y direction according to the track precision P and the tab speed proportion R:
S y ＝P*R
step size in X direction:
S x ＝P
dividing the total length T of the single lug into X-direction lengths T x And Y-direction length T y Calculating the number S of single-chip tab data segments:
S＝T x /S x +T y /S y
the total length T of the tab is the circumference of the whole tab. The pole piece is moved, and the laser is controlled to periodically cut the moving pole piece on the processing plane.
Calculating the offset value O of the track, which is to be overlapped by one step length, according to the total length L of the pole pieces and the number S of the data segments
O＝S/L
Calculating the coordinates of a right bottom arc segment by taking the right bottom arc of the lug as a starting point:
x_rb＝x_arc_rb-r_bot*sin(m*angle_arc_rb)
y_rb＝y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))
wherein r_bot represents the radius of the bottom fillet on the right side of the tab, x and y are the coordinates of the current point location, x_arc_rb and y_arc_rb are the starting points of the bottom right arc, and are defined as (0, 0), namely:
x_arc_rb＝0，y_arc_rb＝0
m is the current segment number of the right bottom arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom arc, and the value of the radian is represented by the single step length S x And the right bottom arc radius r_bot:
angle_arc_rb＝S x /r_bot
calculating the coordinates of the right section of the height of the tab:
y_rh＝y+S y
wherein S is x 、S y A step length in the X direction and a step length in the Y direction are expressed;
calculating the coordinates of the right top arc segment:
x_rt＝x_arc_rt-(r_top-r_top*cos(m*angle_arc_rt*R))
y_rt＝y_arc_rt+r_top*sin(m*angle_arc_rt*R)
wherein r_top represents the radius of the top fillet at the right side of the tab, and R represents the tab speed ratio;
the starting point of the right top circular arc is as follows:
x_arc_rt＝-r_bot，y_arc_rt＝H 2 -r_top
single step arc of right top arc starting point:
angle_arc_rt＝S x /r_top
calculating the top linear coordinates of the tab:
x_t＝x-S x
calculating the coordinates of the left top arc segment:
x_lt＝x_arc_lt-l_top*sin(m*angle_arc_lt*R)
y_lt＝y_arc_lt-(l_top-l_top*cos(m*angle_arc_lt*R))
wherein, l_top represents the radius of the left top fillet of the tab, and the left top arc starting point:
x_arc_lt＝-M+l_top+l_bot，y_arc_lt＝H 2
single step arc of the left top arc starting point:
angle_arc_lt＝S x /l_top
calculating the left segment coordinates of the height of the tab:
y_lh＝y_lt-S y
calculating the left bottom arc segment coordinates:
x_lb＝x_arc_lb-(l_bot-l_bot*cos(m*angle_arc_lb))
y_lb＝y_arc_lb-l_bot*sin(m*angle_arc_lb))
wherein, l_bot represents the radius of the bottom fillet at the left side of the tab, and the starting point of the left bottom arc:
x_arc_lb＝-M+l_bot，y_arc_lb＝l_bot
single step arc of left bottom arc starting point:
angle_arc_lb＝S x /l_bot
calculating the bottom linear coordinates of the polar lug:
x_b＝x_lb-S x
based on the theoretical coordinate point positions, an offset value O is superimposed on each x original coordinate:
x offset of deflection ＝x Original source +O*n
Wherein n is the current tab segment number of the single tab.
And after the offset value O is superimposed on each given x-coordinate point position, generating tab movement track data.
Specifically, the substrate portion at the bottom of the tab is coated, the portion above the substrate is aluminum foil, and a transition buffer is provided between the coating and the aluminum foil. If the integral frequency and power are set for the single tab, when the power and frequency are smaller, the aluminum foil can be cut off, but the aluminum foil is continuously coated, or the aluminum foil can be cut off and has the conditions of burrs or sticking edges; when the power and frequency are large, both the aluminum foil and the coating material can be cut off, but there is a significant waste of laser energy at the aluminum foil. Therefore, in order to adapt to different material parts of the tab, the laser power W of the top part A of the tab is respectively set A Frequency P A The method comprises the steps of carrying out a first treatment on the surface of the Laser power W of tab height portion B B Frequency P B The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of left-thinned part of tab CL Frequency P CL The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of right-cut part of tab CR Frequency P CR The method comprises the steps of carrying out a first treatment on the surface of the Lug substrate portion D laser power W D Frequency P D The method comprises the steps of carrying out a first treatment on the surface of the Height H of thinning C Substrate height H D . Through the optimization mode, the situation of the cut tab burrs and the cut adhesive edges is successfully reduced, and the energy efficiency of the laser is effectively improved.
Laser power W for setting tab top A A Frequency P A ：
W＝W A ,P＝P A H 2 ≤y
Wherein W, P represents the power and frequency of the current coordinate point location, respectively; h 2 The height of the electrode lug; y is the coordinate value of the current position;
laser power W for setting tab height portion B B Frequency P B ：
W＝W B ,P＝P B H C +H D ≤y≤H 2
Wherein H is C The thinning height is represented by the length of the area of the tab material from the coating material to the aluminum foil material; h D Indicating the substrate height, meaning the length of the coating material above the base line of the bottom of the pole ear;
laser power W for setting left-thinned part C of tab CL Frequency P CL ：
W＝W CL ,P＝P CL H D ≤y≤H C +H D ,x＝-M+l_bot
Wherein M represents the bottom width of the pole ear, and l_bot represents the radius of the bottom fillet at the left side of the pole ear;
laser power W for setting tab right thinned portion C CR Frequency P CR ：
W＝W CR ,P＝P CR H D ≤y≤H C +H D ,x＝-r_bot
Setting the laser power W of the lug base material part D D Frequency P D ：
W＝W D ,P＝P D y≤H D
Specifically, due to the mechanical principle of the galvanometer itself, the error of the scanning angle of the galvanometer in the X and Y directions is smaller within the range of +/-7 degrees, and after exceeding the angle range, the error of the position is larger at the farther from the center point. Therefore, in a state where the tape is stationary, a square of 40mm by 40mm size is cut, and corresponding compensation data is prepared by measuring the dimensions in the X, Y directions at intervals of 1mm, respectively:
x_offset＝x management device /x Measuring
y_offset＝y Management device /y Measuring
Wherein x_offset is the x coordinate compensation ratio, y_offset is the y coordinate compensation ratio, x Management device Theoretical coordinate value of x, x Measuring For the measured coordinate value of x, y Management device Theoretical coordinate value of y, y Measuring Is the measured coordinate value of y. And according to the measured compensation text, performing galvanometer distortion compensation on the track data:
x＝x*x_offset
y＝y*y_offset
specifically, data is loaded to a motion control card, and the speed of laser cutting is controlled to dynamically change along with the speed of a conveyor belt according to the return pulse of an encoder, and the method comprises the steps of firstly calculating the pulse change value in a single period:
add_pulse＝now_pulse-old_pulse
wherein, now_pulse is the encoder pulse value of the current period, old_pulse is the last period pulse value, add_pulse is the encoder pulse change value in one period, and then pulse accumulation in each period is calculated:
base_pulse＝base_pulse+add_pulse
the base_pulse is the current pulse value of the singlechip, and the current data position to be walked is found according to the total pulse number:
data_run_num＝base_pulse*data_total_num/total_pulse
wherein, data_run_num is the number of data segments currently running, data_total_num is the total number of segments of single-chip tab data, total_pulse is the total number of pulses of single-chip tab primitive length, and the value is determined by the number of pulses per millimeter mm_pulse of the encoder and the total length L of the single-chip pole piece:
total_pulse＝mm_pulse*L
the value of mm_pulse is determined by the encoder single-turn pulse_round and the encoder single-turn run len_round:
mm_pulse＝pulse_round/len_round
specifically, as shown in the illustration of the size of the double-sided tab cut by the monolithic coating in fig. 5, the system supports two-channel simultaneous processing, and the processed channel numbers can be set on the main interface to respectively control two sets of galvanometer equipment and IPG laser equipment. On the processing plane, the conveying direction of the material belt is the X direction, and the two sets of vibrating mirrors are placed by taking the X axis as a symmetry axis, so that the first channel is used as a reference, and the second channel only needs to enable the coordinate of the Y direction to be the negative value of the first channel.
Specifically, after the system is started, the laser can be controlled to periodically cut the movable pole piece on the processing plane.
Example 2
The embodiment of the method for cutting the tab with the shape of the opposite tab can be used for a laser cutting machine for the tab of a lithium battery, and as shown in fig. 2, the embodiment includes the following specific embodiments.
Specifically, corresponding tab parameters including total length L of the pole piece, bottom width M of the tab and tab height H are input into tab parameter sub-windows in the tab parameter setting window 2 A left bottom corner radius l_bot, a left top corner radius l_top, a right bottom corner radius r_bot, a right top corner radius r_top; in other shape parameter sub-windows, the shape is selected to be the opposite tab, and the position is the front of the tab. For the additional dimension parameters in front of the counter-tab, including the counter-tab horizontal distance W f Vertical height H of counter tab f Arc diameter D of counter electrode lug f Radius R of bottom arc of counter electrode f . And setting a proper tab speed ratio so that tab coordinates are limited in the processing range of the anti-shake firmware.
Specifically, according to the track precision P and the tab speed proportion R, calculating the step length in the Y direction:
S y ＝P*R
step size in X direction:
S x ＝P
dividing the total length T of the single lug into X-direction lengths T x And Y-direction length T y Calculating the number S of single-chip tab data segments:
S＝T x /S x +T y /S y
the total length T of the tab is the circumference of the whole tab. The pole piece is moved, and the laser is controlled to periodically cut the moving pole piece on the processing plane.
Calculating the offset value O of the track, which is to be overlapped by one step length, according to the total length L of the pole pieces and the number S of the data segments
O＝S/L
Calculating the coordinates of a right bottom arc segment by taking the right bottom arc of the lug as a starting point:
x_rb＝x_arc_rb-r_bot*sin(m*angle_arc_rb)
y_rb＝y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))
wherein r_bot represents the radius of the bottom fillet on the right side of the tab, x and y are the coordinates of the current point location, x_arc_rb and y_arc_rb are the starting points of the bottom right arc, and are defined as (0, 0), namely:
x_arc_rb＝0，y_arc_rb＝0
m is the current segment number of the right bottom arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom arc, and the value of the radian is represented by the single step length S x And the right bottom arc radius r_bot:
angle_arc_rb＝S x /r_bot
calculating the coordinates of the right section of the height of the tab:
y_rh＝y+S y
wherein S is x 、S y A step length in the X direction and a step length in the Y direction are expressed;
calculating the coordinates of the right top arc segment:
x_rt＝x_arc_rt-(r_top-r_top*cos(m*angle_arc_rt*R))
y_rt＝y_arc_rt+r_top*sin(m*angle_arc_rt*R)
wherein r_top represents the radius of the top fillet at the right side of the tab, and R represents the tab speed ratio;
the starting point of the right top circular arc is as follows:
x_arc_rt＝-r_bot，y_arc_rt＝H 2 -r_top
single step arc of right top arc starting point:
angle_arc_rt＝S x /r_top
calculating the top linear coordinates of the tab:
x_t＝x-S x
calculating the coordinates of the left top arc segment:
x_lt＝x_arc_lt-l_top*sin(m*angle_arc_lt*R)
y_lt＝y_arc_lt-(l_top-l_top*cos(m*angle_arc_lt*R))
wherein, l_top represents the radius of the left top fillet of the tab, and the left top arc starting point:
x_arc_lt＝-M+l_top+l_bot，y_arc_lt＝H 2
single step arc of the left top arc starting point:
angle_arc_lt＝S x /l_top
calculating the left segment coordinates of the height of the tab:
y_lh＝y_lt-S y
calculating the left bottom arc segment coordinates:
x_lb＝x_arc_lb-(l_bot-l_bot*cos(m*angle_arc_lb))
y_lb＝y_arc_lb-l_bot*sin(m*angle_arc_lb))
wherein, l_bot represents the radius of the bottom fillet at the left side of the tab, and the starting point of the left bottom arc:
x_arc_lb= -m+l_bot, y_arc_lb = l_bot single step radians of the start of the left bottom arc:
angle_arc_lb＝S x /l_bot
calculating coordinates of a straight line segment on the right side of the counter electrode lug:
x_fr＝x_lb-S x
calculating the coordinates of the right top arc section of the counter electrode lug:
x_frt＝x_arc_frt-R f *sin(m*angle_arc_frt)
y_frt＝y_arc_frt-(R f -R f *cos(m*angle_arc_frt))
wherein, right top circular arc starting point:
x_arc_frt＝-L+W f +D f /2+R f ，y_arc_frt＝0
single step radian:
angle_arc_frt＝S x /R f
calculating the coordinates of the right segment of the height of the counter electrode lug:
y_frh＝y_frt-S y
calculating the coordinates of the arc section at the bottom of the counter electrode lug:
x_fb＝x_arc_fb-(D f /2-D f /2*cos(m*angle_arc_fb))
y_fb＝y_arc_fb+D f /2*sin(m*angle_arc_fb)
wherein, the arc starting point of the bottom of the counter electrode lug:
x_arc_fb＝-L+W f +D f /2，y_arc_fb＝-H f +D f /2
single step radian:
angle_arc_fb＝S x /D f /2
calculating the left segment coordinates of the height of the counter electrode lug:
y_flh＝y_fb+S y
calculating the left top arc segment coordinates of the counter electrode lug:
x_flt＝x_arc_flt-(R f -R f *cos(m*angle_arc_flt))
y_flt＝y_arc_flt+R f *sin(m*angle_arc_flt)
wherein, the left top arc starting point of the counter electrode lug:
x_arc_flt＝-L+W f -D f /2，y_arc_flt＝-R f
single step radian:
angle_arc_flt＝S x /R f
calculating the left straight line segment coordinates of the counter electrode lug:
x_fl＝x_flt-S x
based on the theoretical coordinate point positions, an offset value O is superimposed on each x original coordinate:
x offset of deflection ＝x Original source +O*n
Wherein n is the current tab segment number of the single tab.
And after the offset value O is superimposed on each given x-coordinate point position, generating tab movement track data.
Specifically, in order to adapt to different material parts of the tab, the laser power W of the top part A of the tab is respectively set A Frequency P A The method comprises the steps of carrying out a first treatment on the surface of the Laser power W of tab height portion B B Frequency P B The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of left-thinned part of tab CL Frequency P CL The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of right-cut part of tab CR Frequency P CR The method comprises the steps of carrying out a first treatment on the surface of the Lug substrate portion D laser power W D Frequency P D The method comprises the steps of carrying out a first treatment on the surface of the Height H of thinning C Substrate height H D The method comprises the steps of carrying out a first treatment on the surface of the The power and frequency of the counter tab portion are consistent with those of the base material portion. Through the optimization mode, the situation of the cut tab burrs and the cut adhesive edges is successfully reduced, and the energy efficiency of the laser is effectively improved.
Laser power W for setting tab top A A Frequency P A ：
W＝W A ,P＝P A H 2 ≤y
Laser power W for setting tab height portion B B Frequency P B ：
W＝W B ,P＝P B H C +H D ≤y≤H 2
Laser power W for setting left-thinned part C of tab CL Frequency P CL ：
W＝W CL ,P＝P CL H D ≤y≤H C +H D ,x＝-M+l_bot
(
Laser power W for setting tab right thinned portion C CR Frequency P CR ：
W＝W CR ,P＝P CR H D ≤y≤H C +H D ,x＝-r_bot
Setting the laser power W of the lug base material part D D Frequency P D ：
W＝W D ,P＝P D y≤H D
Specifically, due to the mechanical principle of the galvanometer itself, the error of the scanning angle of the galvanometer in the X and Y directions is smaller within the range of +/-7 degrees, and after exceeding the angle range, the error of the position is larger at the farther from the center point. Therefore, in a state where the tape is stationary, a square of 40mm by 40mm size is cut, and corresponding compensation data is prepared by measuring the dimensions in the X, Y directions at intervals of 1mm, respectively:
x_offset＝x management device /x Measuring
y_offset＝y Management device /y Measuring
Wherein x_offset is the x coordinate compensation ratio, y_offset is the y coordinate compensation ratio, x Management device Theoretical coordinate value of x, x Measuring For the measured coordinate value of x, y Management device Theoretical coordinate value of y, y Measuring Is the measured coordinate value of y. And according to the measured compensation text, performing galvanometer distortion compensation on the track data:
x＝x*x_offset
y＝y*y_offset
specifically, data is loaded to a motion control card, and the speed of laser cutting is controlled to dynamically change along with the speed of a conveyor belt according to the return pulse of an encoder, and the method comprises the steps of firstly calculating the pulse change value in a single period:
add_pulse＝now_pulse-old_pulse
wherein, now_pulse is the encoder pulse value of the current period, old_pulse is the last period pulse value, add_pulse is the encoder pulse change value in one period, and then pulse accumulation in each period is calculated:
base_pulse＝base_pulse+add_pulse
the base_pulse is the current pulse value of the singlechip, and the current data position to be walked is found according to the total pulse number:
data_run_num＝base_pulse*data_total_num/total_pulse
wherein, data_run_num is the number of data segments currently running, data_total_num is the total number of segments of single-chip tab data, total_pulse is the total number of pulses of single-chip tab primitive length, and the value is determined by the number of pulses per millimeter mm_pulse of the encoder and the total length L of the single-chip pole piece:
total_pulse＝mm_pulse*L
the value of mm_pulse is determined by the encoder single-turn pulse_round and the encoder single-turn run len_round:
mm_pulse＝pulse_round/len_round
specifically, as shown in the illustration of the size of the double-sided tab cut by the monolithic coating in fig. 5, the system supports two-channel simultaneous processing, and the processed channel numbers can be set on the main interface to respectively control two sets of galvanometer equipment and IPG laser equipment. On the processing plane, the conveying direction of the material belt is the X direction, and the two sets of vibrating mirrors are placed by taking the X axis as a symmetry axis, so that the first channel is used as a reference, and the second channel only needs to enable the coordinate of the Y direction to be the negative value of the first channel.
Specifically, after the system is started, the laser can be controlled to periodically cut the movable pole piece on the processing plane.
Example 3
The embodiment of the method for cutting the tab with the positioning hole shape by using the laser can be used for a lithium battery tab laser cutting machine, and as shown in fig. 3, the embodiment comprises the following specific implementation matters.
Specifically, corresponding tab parameters including total length L of the pole piece, bottom width M of the tab and tab height H are input into tab parameter sub-windows in the tab parameter setting window 2 A left bottom corner radius l_bot, a left top corner radius l_top, a right bottom corner radius r_bot, a right top corner radius r_top; in other shape parameter sub-windows, the shape is selected as a positioning hole, and the position of the positioning hole is in front of the tab. For the additional dimension parameters in front of the lug of the positioning hole, the additional dimension parameters comprise the horizontal distance W of the positioning hole d Vertical distance H of positioning hole d Circular diameter D of positioning hole d The locating hole is vertical to the length F. And setting a proper tab speed ratio so that tab coordinates are limited in the processing range of the anti-shake firmware.
Specifically, according to the track precision P and the tab speed proportion R, calculating the step length in the Y direction:
S y ＝P*R
step size in X direction:
S x ＝P
dividing the total length T of the single lug into X-direction lengths T x And Y-direction length T y Calculating the number S of single-chip tab data segments:
S＝T x /S x +T y /S y
the total length T of the tab is the circumference of the whole tab. The pole piece is moved, and the laser is controlled to periodically cut the moving pole piece on the processing plane.
Calculating the offset value O of the track, which is to be overlapped by one step length, according to the total length L of the pole pieces and the number S of the data segments
O＝S/L
Calculating the coordinates of a right bottom arc segment by taking the right bottom arc of the lug as a starting point:
x_rb＝x_arc_rb-r_bot*sin(m*angle_arc_rb)
y_rb＝y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))
wherein r_bot represents the radius of the bottom fillet on the right side of the tab, x and y are the coordinates of the current point location, x_arc_rb and y_arc_rb are the starting points of the bottom right arc, and are defined as (0, 0), namely:
x_arc_rb＝0，y_arc_rb＝0
m is the current segment number of the right bottom arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom arc, and the value of the radian is represented by the single step length S x And the right bottom arc radius r_bot:
angle_arc_rb＝S x /r_bot
calculating the coordinates of the right section of the height of the tab:
y_rh＝y+S y
wherein S is x 、S y A step length in the X direction and a step length in the Y direction are expressed;
calculating the coordinates of the right top arc segment:
x_rt＝x_arc_rt-(r_top-r_top*cos(m*angle_arc_rt*R))
y_rt＝y_arc_rt+r_top*sin(m*angle_arc_rt*R)
wherein r_top represents the radius of the top fillet at the right side of the tab, and R represents the tab speed ratio;
the starting point of the right top circular arc is as follows:
x_arc_rt＝-r_bot，y_arc_rt＝H 2 -r_top
single step arc of right top arc starting point:
angle_arc_rt＝S x /r_top
calculating the top linear coordinates of the tab:
x_t＝x-S x
calculating the coordinates of the left top arc segment:
x_lt＝x_arc_lt-l_top*sin(m*angle_arc_lt*R)
y_lt=y_arc_lt- (l_top-l_top_cos (m angle_arc_lt R)) where l_top represents the radius of the top fillet on the left side of the tab, the start of the left top arc:
x_arc_lt＝-M+l_top+l_bot，y_arc_lt＝H 2
single step arc of the left top arc starting point:
angle_arc_lt＝S x /l_top
calculating the left segment coordinates of the height of the tab:
y_lh＝y_lt-S y
calculating the left bottom arc segment coordinates:
x_lb＝x_arc_lb-(l_bot-l_bot*cos(m*angle_arc_lb))
y_lb＝y_arc_lb-l_bot*sin(m*angle_arc_lb))
wherein, l_bot represents the radius of the bottom fillet at the left side of the tab, and the starting point of the left bottom arc:
x_arc_lb＝-M+l_bot，y_arc_lb＝l_bot
single step arc of left bottom arc starting point:
angle_arc_lb＝S x /l_bot
calculating coordinates of a right straight line segment of the positioning hole:
x_dr＝x_lb-S x
calculating coordinates of a descending section of the positioning hole:
y_dd＝y_lb-S y
calculating the coordinates of the right top arc section of the positioning hole:
x_drt＝y_arc_drt+D d *sin(m*angle_arc_drt*R)
y_drt＝x_arc_drt-(D d -D d *cos(m*angle_arc_drt*R))
wherein, locating hole right top circular arc starting point:
x_arc_drt＝-L+W d ，y_arc_drt＝-H d +F/2
single step radian:
angle_arc_drt＝S x /D d /2
calculating the right section coordinates of the height of the positioning hole:
y_drh＝y_drt-S y
calculating the bottom arc segment coordinates of the positioning hole:
x_db＝x_arc_db-(D d /2-D d /2*cos(m*angle_arc_db*R))
y_db＝y_arc_db+D d /2*sin(m*angle_arc_db*R)
wherein, locating hole bottom circular arc starting point:
x_arc_db＝-L+W d +D d /2，y_arc_db＝-H d -F/2+D d /2
single step radian:
angle_arc_db＝S x /D d /2
calculating the left section coordinates of the height of the positioning hole:
y_dlh＝y_db+S y
calculating the left top arc segment coordinates of the positioning hole:
x_dlt＝x_arc_dlt-(D d -D d *cos(m*angle_arc_dlt*R))
y_dlt＝y_arc_dlt-D d *sin(m*angle_arc_dlt*R))
wherein, the left bottom circular arc starting point:
x_arc_dlt＝-L+W d -D d /2，y_arc_dlt＝-H d +F/2-D d /2
single step radian:
angle_arc_dlt＝S x /D d /2
calculating the ascending section coordinates of the positioning holes:
y_du＝y_dlt+S y
calculating the left straight line segment coordinates of the positioning hole:
x_dl＝x_dlt-S x
based on the theoretical coordinate point, the offset value O is superimposed on each x coordinate
x Offset of deflection ＝x Original source +O*n
Wherein n is the current tab segment number of the single tab.
And after the offset value O is superimposed on each given x-coordinate point position, generating tab movement track data.
Specifically, in order to adapt to different material parts of the tab, the laser power W of the top part A of the tab is respectively set A Frequency P A The method comprises the steps of carrying out a first treatment on the surface of the Laser power W of tab height portion B B Frequency P B The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of left-thinned part of tab CL Frequency P CL The method comprises the steps of carrying out a first treatment on the surface of the C laser power W of right-cut part of tab CR Frequency P CR The method comprises the steps of carrying out a first treatment on the surface of the Lug substrate portion D laser power W D Frequency P D The method comprises the steps of carrying out a first treatment on the surface of the Height H of thinning C Substrate height H D . Through the optimization mode, the situation of the cut tab burrs and the cut adhesive edges is successfully reduced, and the energy efficiency of the laser is effectively improved.
Laser power W for setting tab top A A Frequency P A ：
W＝W A ,P＝P A H 2 ≤y
Laser power W for setting tab height portion B B Frequency P B ：
W＝W B ,P＝P B H C +H D ≤y≤H 2
H C The thinning height is represented by the length of the area of the tab material from the coating material to the aluminum foil material; h D Indicating the substrate height, meaning the length of the coating material above the base line of the bottom of the pole ear;
laser power W for setting left-thinned part C of tab CL Frequency P CL ：
W＝W CL ,P＝P CL H D ≤y≤H C +H D ,x＝-M+l_bot
Laser power W for setting tab right thinned portion C CR Frequency P CR ：
W＝W CR ,P＝P CR H D ≤y≤H C +H D ,x＝-r_bot
Setting the laser power W of the lug base material part D D Frequency P D ：
W＝W D ,P＝P D 0≤y≤H D
The descending straight line section of the positioning hole is longer, so the positioning hole part adopts S y The step length is used, so that the power and the frequency of the positioning hole part are consistent with the height part of the lug, and the power and the frequency are set to be 0 at the ascending and descending parts of the positioning hole, so that the laser is prevented from emitting light. Setting laser power of a positioning hole part:
W＝0,P＝0-H d +F/2<y<0
W＝W B ,P＝P B -H d -F/2≤y≤-H d +F/2
specifically, due to the mechanical principle of the galvanometer itself, the error of the scanning angle of the galvanometer in the X and Y directions is smaller within the range of +/-7 degrees, and after exceeding the angle range, the error of the position is larger at the farther from the center point. Therefore, in a state where the tape is stationary, a square of 40mm by 40mm size is cut, and corresponding compensation data is prepared by measuring the dimensions in the X, Y directions at intervals of 1mm, respectively:
x_offset＝x management device /x Measuring
y_offset＝y Management device /y Measuring
Wherein x_offset is the x coordinate compensation ratio, y_offset is the y coordinate compensation ratio, x Management device Theoretical coordinate value of x, x Measuring For the measured coordinate value of x, y Management device Theoretical coordinate value of y, y Measuring Is the measured coordinate value of y. And according to the measured compensation text, performing galvanometer distortion compensation on the track data:
x＝x*x_offset
y＝y*y_offset
specifically, data is loaded to a motion control card, and the speed of laser cutting is controlled to dynamically change along with the speed of a conveyor belt according to the return pulse of an encoder, and the method comprises the steps of firstly calculating the pulse change value in a single period:
add_pulse＝now_pulse-old_pulse
wherein, now_pulse is the encoder pulse value of the current period, old_pulse is the last period pulse value, add_pulse is the encoder pulse change value in one period, and then pulse accumulation in each period is calculated:
base_pulse＝base_pulse+add_pulse
the base_pulse is the current pulse value of the singlechip, and the current data position to be walked is found according to the total pulse number:
data_run_num＝base_pulse*data_total_num/total_pulse
wherein, data_run_num is the number of data segments currently running, data_total_num is the total number of segments of single-chip tab data, total_pulse is the total number of pulses of single-chip tab primitive length, and the value is determined by the number of pulses per millimeter mm_pulse of the encoder and the total length L of the single-chip pole piece:
total_pulse＝mm_pulse*L
the value of mm_pulse is determined by the encoder single-turn pulse_round and the encoder single-turn run len_round:
mm_pulse＝pulse_round/len_round
specifically, as shown in the illustration of the size of the double-sided tab cut by the monolithic coating in fig. 5, the system supports two-channel simultaneous processing, and the processed channel numbers can be set on the main interface to respectively control two sets of galvanometer equipment and IPG laser equipment. On the processing plane, the conveying direction of the material belt is the X direction, and the two sets of vibrating mirrors are placed by taking the X axis as a symmetry axis, so that the first channel is used as a reference, and the second channel only needs to enable the coordinate of the Y direction to be the negative value of the first channel.
Specifically, after the system is started, the laser can be controlled to periodically cut the movable pole piece on the processing plane.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims (10)

1. A method for cutting lithium battery lugs by laser is used for finishing cutting of various lug shapes; the method is characterized in that: the whole tab graph is segmented, different speed proportion setting and laser parameter setting can be carried out according to the subdivision path segment, and the method comprises the following steps:
s1, setting shape and size parameters of a pole piece to be cut, and setting a pole lug speed proportion according to the selected shape and size parameters;
s2, calculating the step length in the Y direction and the step length in the X direction according to the track precision and the tab speed proportion, calculating the number of single-sheet tab data segments according to the total length of the single-sheet tab and the track precision, and calculating the offset value to be overlapped of one step length in the track according to the total length of the pole pieces and the number of the data segments to generate tab movement track data;
s3, respectively setting laser energy parameter power and frequency of a lug top part, a lug height part, a thinned part and a base material part, and generating lug laser energy parameter data;
s4, cutting a square with a certain size in a static state of the material belt, respectively measuring the sizes of the material belt in the X and Y directions at intervals of each millimeter to manufacture corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at a final coordinate production position;
s5, loading data to a motion control card, starting a conveyor belt to enable a pole piece to be cut to move, and controlling the laser cutting speed to dynamically change along with the speed of the conveyor belt according to the return pulse of an encoder;
s6, starting the system to control the laser to periodically cut the movable pole piece on the processing plane.
2. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: the pole piece to be cut comprises a common pole lug, an opposite pole lug and a positioning hole.
3. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: the dimension parameter comprises the total length L of the single pole piece, the bottom width M of the pole lug and the height H of the pole lug 2 The bottom fillet r_bot on the right side of the tab, the top fillet r_top on the right side of the tab, the top fillet l_top on the left side of the tab and the bottom fillet l_bot on the left side of the tab;
the dimension parameter in front of the counter-tab includes the counter-tab horizontal distance W f Vertical height H of counter electrode lug f Arc diameter D of counter electrode lug f Radius R of bottom arc of counter electrode f ；
The dimension parameters in front of the lug of the positioning hole comprise the horizontal distance W of the positioning hole d Vertical distance H of positioning holes d Circular arc diameter D of positioning hole d The vertical length F of the positioning hole;
the dimension parameter in the tab does not need to be set with a horizontal distance W f Or W d 。
4. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: calculating the step length in the Y direction according to the track precision P and the tab speed proportion R:
S y ＝P*R
step size in X direction:
S x ＝P
dividing the total length T of the single lug into X-direction lengths T x And Y-direction length T y Calculating the number S of single-chip tab data segments:
S＝T x /S x +T y /S y
and calculating an offset value O to be overlapped of one step length in the track according to the total length L of the pole pieces and the number S of the data segments:
O＝S/L
and superposing offset values O on each given x-coordinate point position to generate tab movement track data.
5. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: calculating the coordinates of a right bottom arc segment by taking the right bottom arc of the lug as a starting point:
x_rb＝x_arc_rb-r_bot*sin(m*angle_arc_rb)
y_rb＝y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))
wherein r_bot represents the radius of the bottom fillet on the right side of the tab, x and y are the coordinates of the current point location, x_arc_rb and y_arc_rb are the starting points of the bottom right arc, and are defined as (0, 0), namely:
x_arc_rb＝0，y_arc_rb＝0
m is the current segment number of the right bottom arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom arc, and the value of the radian is represented by the single step length S x And the right bottom arc radius r_bot:
angle_arc_rb＝S x /r_bot
calculating the coordinates of the right section of the height of the tab:
y_rh＝y+S y
wherein S is x 、S y A step length in the X direction and a step length in the Y direction are expressed;
calculating the coordinates of the right top arc segment:
x_rt=x_arc_rt- (r_top-r_top_cos (m_angle_arc_rt R)) y_rt=y_arc_rt+r_top sin (m_angle_arc_rt R), where r_top represents the radius of the top corner on the tab right side and R represents the tab speed ratio:
x_arc_rt＝-r_bot，y_arc_rt＝H 2 -r_top
single step arc of right top arc starting point:
angle_arc_rt＝S x /r_top
calculating the top linear coordinates of the tab:
x_t＝x-S x
calculating the coordinates of the left top arc segment:
x_lt＝x_arc_lt-l_top*sin(m*angle_arc_lt*R)
y_lt=y_arc_lt- (l_top-l_top_cos (m angle_arc_lt R)) where l_top represents the radius of the top fillet on the left side of the tab, the start of the left top arc:
x_arc_lt＝-M+l_top+l_bot，y_arc_lt＝H 2
single step arc of the left top arc starting point:
angle_arc_lt＝S x /l_top
calculating the left segment coordinates of the height of the tab:
y_lh＝y_lt-S y
calculating the left bottom arc segment coordinates:
x_lb＝x_arc_lb-(l_bot-l_bot*cos(m*angle_arc_lb))
y_lb = y_arc_lb-l_bot sin (m x angle_arc_lb)) where l_bot represents the radius of the bottom fillet on the left side of the tab, the bottom left arc starting point:
x_arc_lb＝-M+l_bot，y_arc_lb＝l_bot
single step arc of left bottom arc starting point:
angle_arc_lb＝S x /l_bot
calculating the bottom linear coordinates of the polar lug:
x_b＝x_lb-S x
based on the theoretical coordinate point positions, an offset value O is superimposed on each x original coordinate:
x offset of deflection ＝x Original source +O*n
Wherein n is the current tab segment number of the single tab.
6. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: laser power W for setting tab top portion A A Frequency P A The method comprises the steps of carrying out a first treatment on the surface of the Laser power W of tab height portion B B Frequency P B Laser power W of left thinned portion C CL Frequency P CL And right skived portion C laser power W CR Frequency P CR The method comprises the steps of carrying out a first treatment on the surface of the Substrate portion D laser power W D Frequency P D And generating tab laser energy parameter data.
7. The method for cutting the tab of the lithium battery by using the laser according to claim 6, wherein: laser power W for setting tab top A A Frequency P A ：
W＝W A ,P＝P A H 2 ≤y
Wherein W, P represents the power and frequency of the current coordinate point; h 2 The height of the electrode lug; y is the coordinate value of the current position;
laser power W for setting tab height portion B B Frequency P B ：
W＝W B ,P＝P B H C +H D ≤y≤H 2
Wherein H is C The thinning height is represented by the length of the area of the tab material from the coating material to the aluminum foil material; h D Indicating the substrate height, meaning the length of the coating material above the base line of the bottom of the pole ear;
laser power W for setting left-thinned part C of tab CL Frequency P CL ：
W＝W CL ,P＝P CL H D ≤y≤H C +H D ,x＝-M+l_bot
Wherein M represents the bottom width of the lug, and l_bot represents the radius of the bottom fillet at the left side of the lug;
laser power W for setting tab right thinned portion C CR Frequency P CR ：
W＝W CR ,P＝P CR H D ≤y≤H C +H D ,x＝-r_bot
Setting the laser power W of the lug base material part D D Frequency P D ：
W＝W D ,P＝P D y≤H D 。
8. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: and cutting squares with corresponding sizes under the static state of the material belt, respectively measuring the size of X, Y directions of intervals of every millimeter, manufacturing corresponding compensation data, and carrying out galvanometer distortion compensation on each coordinate point at the final coordinate production position.
9. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: the speed of the laser cut is controlled to dynamically vary with the speed of the conveyor belt based on the return pulses of the encoder.
10. The method for cutting the tab of the lithium battery by using the laser according to claim 1, wherein the method comprises the following steps: the cut pole piece is movable, and the laser is controlled to periodically cut the movable pole piece on the processing plane.
CN202310084548.8A 2023-01-13 2023-01-13 Method for cutting lithium battery tab by laser Pending CN116038153A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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CN116275553A (en) * 2023-05-11 2023-06-23 北京金橙子科技股份有限公司 Laser processing method, control device, control equipment and storage medium
CN116532788A (en) * 2023-07-06 2023-08-04 北京金橙子科技股份有限公司 Cylindrical battery laser processing equipment and method
CN116921854A (en) * 2023-07-07 2023-10-24 上海君屹工业自动化股份有限公司 Method for setting defocusing amount of BUSBAR welding
CN117102690A (en) * 2023-07-31 2023-11-24 广东利元亨智能装备股份有限公司 Tab forming method, die cutting machine, cutting and stacking integrated machine and electronic equipment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116275553A (en) * 2023-05-11 2023-06-23 北京金橙子科技股份有限公司 Laser processing method, control device, control equipment and storage medium
CN116275553B (en) * 2023-05-11 2023-08-08 北京金橙子科技股份有限公司 Laser processing method, control device, control equipment and storage medium
CN116532788A (en) * 2023-07-06 2023-08-04 北京金橙子科技股份有限公司 Cylindrical battery laser processing equipment and method
CN116532788B (en) * 2023-07-06 2023-09-01 北京金橙子科技股份有限公司 Cylindrical battery laser processing equipment and method
CN116921854A (en) * 2023-07-07 2023-10-24 上海君屹工业自动化股份有限公司 Method for setting defocusing amount of BUSBAR welding
CN116921854B (en) * 2023-07-07 2024-03-29 上海君屹工业自动化股份有限公司 Method for setting defocusing amount of BUSBAR welding
CN117102690A (en) * 2023-07-31 2023-11-24 广东利元亨智能装备股份有限公司 Tab forming method, die cutting machine, cutting and stacking integrated machine and electronic equipment
CN117102690B (en) * 2023-07-31 2024-06-21 广东利元亨智能装备股份有限公司 Tab forming method, die cutting machine, cutting and stacking integrated machine and electronic equipment

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