A method of laser cutting lithium battery tabs

Abstract

The application discloses a method for laser cutting lithium battery tab, and steps include: based on the size and shape of the tab to be cut, parameter tab parameter, selecting tab shape, setting tab speed; calculating the step length in XY direction as trajectory accuracy, calculating the single tab data segment number and the offset value that should be superimposed in one step of the trajectory, generating corresponding tab motion trajectory data; according to different tab materials, the whole trajectory is divided into different parts, laser parameters of each part are set separately, and tab laser energy parameter data is generated; cutting square size, by measuring the size of each millimeter interval in XY direction respectively, corresponding compensation data is made, and each coordinate point is subjected to galvanometer distortion compensation at the final coordinate production; after compensation, the data is loaded into the motion control card, the material belt is started, the tab to be cut is moved, and the return value of the encoder is used to control the dynamic change of the laser cutting moving speed with the speed of the conveying belt.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery tab processing, and particularly relates to a laser cutting lithium battery tab method. TECHNICAL BACKGROUND

[0002] With the development of new energy vehicles and other mobile devices, the application market of lithium batteries is developing rapidly, and has become the most important product in the current battery products. With the increasing seriousness of the world problems such as energy crisis and environmental pollution, lithium ion batteries occupy a considerable market share due to their high working voltage, large specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, no pollution and other characteristics.

[0003] The laser cutting area of the traditional laser cutting method is large, and the light path of the laser follows the route after the tab is formed. Due to the material belt jitter caused by high-speed laser cutting, the stability of the material belt is seriously affected, and then the cutting precision and efficiency of the tab are affected. This cutting method is fixed and cannot change the cutting shape online (a kind of lithium battery tab laser sheet making method).

[0004] However, as the basis of the entire lithium ion battery manufacturing, the tab manufacturing equipment and manufacturing method need to have good performance, and have high requirements on precision, stability, flexibility and production efficiency. SUMMARY

[0005] The present application is directed to the above-mentioned deficiencies, and proposes a laser cutting lithium battery tab method, which can realize online conversion of the size and type of the cutting tab by setting different tab size parameters and shape parameters; different laser energy areas are divided according to the material of the tab, which effectively reduces the generation of tab burrs and reduces the loss of laser energy; the distortion caused by the mechanical structure of the galvanometer is compensated by the measured compensation data, which effectively improves the cutting precision of the tab; by setting the tab speed ratio parameter, the effective cutting area of the laser in the X direction is compressed, so that the anti-shake mechanical components can be successfully installed in front of the processing plane, greatly reducing the jitter of the material belt, thereby improving the cutting precision of the tab.

[0006] The present application is realized at least by one of the following technical solutions.

[0007] A laser cutting lithium battery tab method is used to complete the cutting of various tab shapes; the entire tab pattern is segmented, and different speed ratio settings and laser parameter settings can be performed according to the subdivision path segment, including the following steps:

[0008] S1, setting the shape and size parameters of the tab to be cut, setting the tab speed ratio according to the selected shape and size parameters;

[0009] S2, according to the trajectory accuracy and the tab speed ratio, calculate the step length in Y direction and X direction, according to the total length of single tab and the trajectory accuracy, calculate the number of data segments of single tab, then calculate the offset value of one step in the trajectory according to the total length of tab and the number of data segments, generate tab movement trajectory data;

[0010] S3, set the laser energy parameters power and frequency of the tab top part, tab height part, thinning part and substrate part respectively, generate tab laser energy parameter data;

[0011] S4, cut a certain size of square in the state of static material belt, make corresponding compensation data by measuring the size of X and Y direction at each millimeter interval, and make galvanometer distortion compensation for each coordinate point in the final coordinate production;

[0012] S5, load data to motion control card, start the conveyor belt to move the tab to be cut, and control the speed of laser cutting to change dynamically with the speed of conveyor belt according to the return pulse of encoder;

[0013] S6, start the system to control the laser to cut the moving tab periodically on the processing plane.

[0014] Further, the shape of the tab to be cut includes ordinary tab, reverse tab and positioning hole.

[0015] Further, the size parameters include total length L of single tab, bottom width M of tab, tab height H2, right side bottom round angle r_bot of tab, right side top round angle r_top of tab, left side top round angle l_top of tab and left side bottom round angle l_bot of tab.

[0016] The size parameters in front of the reverse tab include reverse tab horizontal distance W f , reverse tab vertical height H f , reverse tab arc diameter D f , reverse tab bottom arc radius R f .

[0017] The size parameters in front of the positioning hole include positioning hole horizontal distance W d , positioning hole vertical distance H d , positioning hole arc diameter D d , positioning hole vertical length F.

[0018] The size parameters in the tab do not need to set horizontal distance W f or W d .

[0019] Further, according to the trajectory accuracy P and the tab speed ratio R, calculate the step length in Y direction:

[0020] Sy = P * R

[0021] Step length in X direction:

[0022] S x = P

[0023] Divide the full length of the single tab T into X direction length T x and Y direction length T y , calculate the number of data segments S of the single tab:

[0024] S = T x / S x + T y / S y

[0025] Then calculate the offset value O that should be added in each step in the track from the total length L of the tab and the number of data segments S:

[0026] O = S / L

[0027] Add the offset value O at each given x coordinate point, and the tab movement track data can be generated.

[0028] Further, take the right bottom arc of the tab as the starting point, and calculate the right bottom arc segment coordinates:

[0029] x_rb = x_arc_rb - r_bot * sin(m * angle_arc_rb)

[0030] y_rb = y_arc_rb + (r_bot - r_bot * cos(m * angle_arc_rb))

[0031] Wherein, r_bot represents the radius of the right bottom corner of the tab, x and y are the current point coordinates, x_arc_rb and y_arc_rb are the starting point of the right bottom arc, defined as (0, 0), i.e.:

[0032] x_arc_rb = 0, y_arc_rb = 0

[0033] m is the current segment number of the right bottom arc, angle_arc_rb is the radian of the single step of the starting point of the right bottom arc, which is calculated from the single step length S x and the radius r_bot of the right bottom arc:

[0034] angle_arc_rb = S x / r_bot

[0035] Calculate the right segment coordinates of the tab height:

[0036] y_rh = y + S y

[0037] wherein S x , S y denotes the step size in the X direction, the step size in the Y direction;

[0038] Calculate the right top arc segment coordinates:

[0039] x_rt = x_arc_rt - (r_top - r_top * cos(m * angle_arc_rt * R))

[0040] y_rt = y_arc_rt + r_top * sin(m * angle_arc_rt * R)

[0041] wherein r_top denotes the radius of the right top corner of the tab, and R denotes the tab speed ratio:

[0042] x_arc_rt = -r_bot, y_arc_rt = H2 - r_top

[0043] The radian of a single step of the right top arc starting point:

[0044] angle_arc_rt = S x / r_top

[0045] Calculate the tab top straight line coordinates:

[0046] x_t = x - S x

[0047] Calculate the left top arc segment coordinates:

[0048] x_lt = x_arc_lt - l_top * sin(m * angle_arc_lt * R)

[0049] y_lt = y_arc_lt - (l_top - l_top * cos(m * angle_arc_lt * R)) wherein l_top denotes the radius of the left top corner of the tab, and the left top arc starting point:

[0050] x_arc_lt = -M + l_top + l_bot, y_arc_lt = H2

[0051] The radian of a single step of the left top arc starting point:

[0052] angle_arc_lt = S x / l_top

[0053] Calculate the tab height left segment coordinates:

[0054] y_lh = y_lt - S y

[0055] Calculate the left bottom arc segment coordinate:

[0056] x_lb = x_arc_lb - (l_bot - l_bot * cos(m * angle_arc_lb))

[0057] y_lb = y_arc_lb - l_bot * sin(m * angle_arc_lb))

[0058] Wherein, l_bot represents the radius of the left bottom corner of the lug, the left bottom arc starting point:

[0059] x_arc_lb = -M + l_bot, y_arc_lb = l_bot single step radian of the left bottom arc starting point:

[0060] angle_arc_lb = S x / l_bot

[0061] Calculate the bottom straight line coordinate of the lug:

[0062] x_b = x_lb - S x

[0063] Based on the above theoretical coordinate points, add an offset value O to each x original coordinate:

[0064] x 偏 = x 原 + O * n

[0065] Wherein, n is the current lug segment number of the single lug.

[0066] Further, set the laser power W A , frequency P A of the top part A of the lug; B , frequency P B , laser power W CL , frequency P CL of the left thinning part C and the right thinning part C; CR , frequency P CR ; laser power W D , frequency P D of the base material part D, to generate the lug laser energy parameter data.

[0067] Further, set the laser power W A , frequency P A of the top part A of the lug:

[0068] W = W A , P = P A H2≤ y

[0069] In the formula, W and P represent the power and frequency of the current coordinate point, respectively; H2 is the tab height; y is the coordinate value of the current position;

[0070] Set the laser power W of the tab height part B B , frequency P B :

[0071] W = W B , P = P B H C + H D ≤ y ≤ H2

[0072] In the formula, H C represents the thinning height, which refers to the length of the area where the tab material transitions from the coating material to the aluminum foil material part; H D represents the substrate height, which refers to the length of the coating material above the baseline of the tab bottom;

[0073] Set the laser power W of the tab left thinning part C CL , frequency P CL :

[0074] W = W CL , P = P CL H D ≤ y ≤ H C + H D , x = -M + l_bot

[0075] In the formula, M represents the tab bottom width, and l_bot represents the radius of the tab left bottom round corner;

[0076] Set the laser power W of the tab right thinning part C CR , frequency P CR :

[0077] W = W CR , P = P CR H D ≤ y ≤ H C + H D , x = -r_bot

[0078] Set the laser power W of the tab substrate part D D , frequency P D :

[0079] W = W D , P = P D y ≤ H D .

[0080] Further, in the state of the material belt being static, a square of a corresponding size is cut, and by measuring the size of each millimeter interval in the X and Y directions respectively, corresponding compensation data is made, and each coordinate point is subjected to galvanometer distortion compensation in the final coordinate production.

[0081] Further, the speed of laser cutting is dynamically changed with the speed of the conveying belt according to the return pulse of the encoder.

[0082] Further, the cut pole piece is moving, and the laser is controlled to periodically cut the moving pole piece in the machining plane

[0083] Compared with the prior art, the present application has the following beneficial effects:

[0084] The method is simple and practical, and by setting different pole lug size parameters and shape parameters, online transformation of the pole lug size and shape can be realized, four right-angle pole lugs, four round-angle pole lugs, top straight bottom circle, top circle bottom straight, reverse pole lug and positioning hole and various shape pole lugs can be cut, and different production requirements can be met. The method effectively solves the problems of distortion error caused by the simultaneous fast movement of the cut pole piece and the galvanometer itself structure, the dynamic change of the laser marking speed with the material belt movement speed, the guarantee of the anti-shake firmware installation by compressing the cutting range and the like. The method is highly original, does not need to rely on other auxiliary equipment or auxiliary software, and the algorithm is simple to realize. In the process of pole lug cutting, no other interpolation algorithm is needed.

[0085] The present application realizes laser cutting by using segmented given pole lug coordinates, effectively realizes an online transformation method of various parameters and various shapes, and users only need to set different pole lug size parameters, pole lug speed ratio and select the pole lug shape to be cut on the software to cut the desired pole lug.

[0086] The present application provides a cutting scheme for a lithium battery pole lug laser cutting machine, prevents material belt shaking and guarantees the accuracy of the pole lug. The method of the present application relates to segmented given laser energy parameters of the pole lug, greatly reduces the pole lug burr in the pole lug cutting process, and also reduces the waste of laser energy in the pole lug cutting process. BRIEF DESCRIPTION OF DRAWINGS

[0087] Figure 1 It is a pole lug size parameter illustration diagram for the conventional shape in embodiment 1;

[0088] Figure 2 It is a pole lug size parameter illustration diagram for the reverse pole lug shape in embodiment 2;

[0089] Figure 3 It is a pole lug size parameter illustration diagram for the positioning hole shape in embodiment 3;

[0090] Figure 4A diagram illustrating the division of different laser energy regions based on the material of the electrode;

[0091] Figure 5 Explanation of the dimensions of the double-sided tabs cut for single-sheet coating;

[0092] Figure 6 This is a flowchart of the laser cutting method for lithium battery tabs in an embodiment of the present invention. Detailed Implementation

[0093] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. The described embodiments are merely some examples of the present invention, and not all examples. Other embodiments obtained by those skilled in the art based on the examples in this invention without creative effort are all within the scope of protection of this invention.

[0094] This invention discloses a method for laser-cutting lithium battery tabs, comprising: setting corresponding parameters in a tab parameter setting interface based on the size and shape of the tab to be cut; selecting any tab shape from conventional tabs, reverse tabs, and positioning holes; and setting an appropriate tab speed ratio according to the selected shape; calculating the step size in the Y direction based on the trajectory accuracy and the tab speed ratio, with the step size in the X direction representing the trajectory accuracy; calculating the number of data segments for a single tab based on the total length of the tab and the trajectory accuracy; and then calculating the offset value that should be superimposed for one step size in the trajectory based on the total length of the tab and the number of data segments, thereby generating corresponding tab motion trajectory data; and dividing the entire trajectory into tab sections according to the different tab materials. The top section, the tab height section, the thinning section, and the substrate section each have their own laser parameters set, generating laser energy parameter data for the tabs. With the conveyor belt stationary, a square of a certain size is cut. Compensation data is generated by measuring the dimensions in the X and Y directions at millimeter intervals. Galvanometer distortion compensation is then applied to each coordinate point at the final coordinate production location. The compensated data is loaded into the motion control card, the conveyor belt is turned on, and the electrode to be cut moves. The laser cutting speed is dynamically adjusted based on the encoder's return value, changing with the conveyor belt speed. Clicking "start" controls the laser to periodically cut the moving electrode on the processing plane.

[0095] Example 1

[0096] This embodiment describes a laser cutting method for a conventionally shaped electrode tab. This embodiment can be used in a lithium battery electrode tab laser cutting machine, such as... Figure 1 The diagram shown illustrates the dimensional parameters of a standard electrode tab of a conventional shape. Figure 4 The diagram illustrates the division of different laser energy regions based on the electrode material. A represents the top portion of the electrode tab, B represents the height portion of the electrode tab, C represents the thinned portion of the electrode tab, and D represents the electrode tab substrate portion. Figure 5Figure showing the size of the cut double-sided tab for single piece coating, where W1 represents tab spacing, W2 represents tab width, H1 represents slurry protrusion height, H2 represents tab height, L1 represents coating width, Figure 6 The specific step method flowchart for this embodiment includes the following specific implementation.

[0097] Specifically, as shown in the tab shape of the general tab, Figure 1 the four corners of the top and bottom of the tab can be set as right angles or rounded corners as needed, without positioning holes or counter tabs. The corresponding tab parameters are input in the tab parameter sub-window in the tab parameter setting window, including the total length of the tab L, the bottom width of the tab M, the tab height H2, the left bottom corner radius l_bot, the left top corner radius l_top, the right bottom corner radius r_bot, and the right top corner radius r_top. The appropriate tab speed ratio is set so that the tab coordinates are limited within the processing range of the anti-shake firmware.

[0098] Specifically, in order to reduce the shaking of the material belt during high-speed transmission, an anti-shake fixture is installed between the galvanometer and the processing plane, which can effectively reduce the shaking of the material belt. However, due to the mechanical structure of the anti-shake fixture itself, the originally wide laser cutting range is compressed into a long strip, and the compressed coordinate direction is the X range, so a tab speed ratio R needs to be set. When walking in the Y direction, the step length is R times that of the X direction, that is, the laser speed in the Y direction is R times that in the X direction. The speed ratio R can be dynamically adjusted on the UI interface, so that the time required to walk the same Y direction path becomes shorter, and the offset value in the X direction also decreases, successfully compressing the X direction processing range, while keeping the X direction step length as a single step precision P. According to the track precision P and the tab speed ratio R, the Y direction step length is calculated:

[0099] S y = P * R

[0100] X direction step length:

[0101] S x = P

[0102] Divide the full length T of the single tab into X direction length T x and Y direction length T y , calculate the single tab data segment number S:

[0103] S = T x / S x + T y / S y

[0104] wherein the full length T of the tab is the circumference of the whole tab. The tab piece is moving, and the laser is controlled to periodically cut the moving tab on the processing plane.

[0105] The offset value O that should be superimposed in one step in the track is calculated from the total length L of the pole piece and the number of data segments S

[0106] O=S / L

[0107] Taking the right bottom circular arc of the pole lug as the starting point, the coordinates of the right bottom circular arc segment are calculated:

[0108] x_rb=x_arc_rb-r_bot*sin(m*angle_arc_rb)

[0109] y_rb=y_arc_rb+(r_bot-r_bot*cos(m*angle_arc_rb))

[0110] wherein r_bot represents the radius of the right bottom circular corner of the pole lug, x and y are the coordinates of the current point, x_arc_rb and y_arc_rb are the starting point of the right bottom circular arc, defined as (0, 0), i.e.:

[0111] x_arc_rb=0, y_arc_rb=0

[0112] m is the current segment number of the right bottom circular arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom circular arc, which is calculated from the single step length S x and the radius r_bot of the right bottom circular arc:

[0113] angle_arc_rb=S x / r_bot

[0114] The coordinates of the right segment of the pole lug height are calculated:

[0115] y_rh=y+S y

[0116] wherein S x , S y represent the step length in the X direction and the step length in the Y direction;

[0117] The coordinates of the right top circular arc segment are calculated:

[0118] x_rt=x_arc_rt-(r_top-r_top*cos(m*angle_arc_rt*R))

[0119] y_rt=y_arc_rt+r_top*sin(m*angle_arc_rt*R)

[0120] wherein r_top represents the radius of the right top circular corner of the pole lug, and R represents the speed ratio of the pole lug;

[0121] The starting point of the right top circular arc is:

[0122] x_arc_rt = -r_bot, y_arc_rt = H2 - r_top

[0123] Single step of the arc of the right top arc start point:

[0124] angle_arc_rt = S x / r_top

[0125] Calculate the straight line coordinates of the top of the tab:

[0126] x_t = x - S x

[0127] Calculate the coordinates of the left top arc segment:

[0128] x_lt = x_arc_lt - l_top * sin(m * angle_arc_lt * R)

[0129] y_lt = y_arc_lt - (l_top - l_top * cos(m * angle_arc_lt * R))

[0130] where l_top represents the radius of the left top of the tab, and the left top arc start point:

[0131] x_arc_lt = -M + l_top + l_bot, y_arc_lt = H2

[0132] Single step of the arc of the left top arc start point:

[0133] angle_arc_lt = S x / l_top

[0134] Calculate the coordinates of the left segment of the tab height:

[0135] y_lh = y_lt - S y

[0136] Calculate the coordinates of the left bottom arc segment:

[0137] x_lb = x_arc_lb - (l_bot - l_bot * cos(m * angle_arc_lb))

[0138] y_lb = y_arc_lb - l_bot * sin(m * angle_arc_lb)

[0139] where l_bot represents the radius of the left bottom of the tab, and the left bottom arc start point:

[0140] x_arc_lb = -M + l_bot, y_arc_lb = l_bot

[0141] Single step radian of left bottom arc start point:

[0142] angle_arc_lb = S x / l_bot

[0143] Calculate the straight line coordinate of the bottom of the tab:

[0144] x_b = x_lb - S x

[0145] Based on the above theoretical coordinate points, add an offset value O to each x original coordinate:

[0146] x 偏 = x 原 + O*n

[0147] Where n is the current tab segment number of the single tab.

[0148] After adding the offset value O to each given x coordinate point, the tab motion trajectory data can be generated.

[0149] Specifically, the base material part of the bottom of the tab is coated, the part above the base material is aluminum foil, and there is a transition buffer zone between the coating and the aluminum foil. If a single tab is set with an overall frequency and power, when the power and frequency are small, the aluminum foil can be cut off, but the coating cannot be cut off, or it can be cut off but there will be a situation of burr or sticking edge; when the power and frequency are large, both the aluminum foil and the coating material can be cut off, but there will be obvious waste of laser energy at the aluminum foil. Therefore, in order to adapt to different material parts of the tab, the laser power W A , frequency P A of the top part A of the tab are set respectively; the laser power W B , frequency P B of the height part B of the tab; the laser power W CL , frequency P CL of the left thinning part C of the tab; the laser power W CR , frequency P CR of the right thinning part C of the tab; the laser power W D , frequency P D of the base material part D of the tab; the thinning height H C , the base material height H D . Through this optimization method, the situation of burr and sticking edge of the cut tab is successfully reduced, and the energy efficiency of the laser is effectively improved.

[0150] The laser power W A , frequency P A of the top part A of the tab are set:

[0151] W = W A , P = P A H2

[0152] wherein W, P represent the power and frequency of the current coordinate point respectively; H2 represents the tab height; y represents the coordinate value of the current position;

[0153] Setting the laser power W B , frequency P B of the tab height part B

[0154] W = W B , P = P B H C + H D ≤ y ≤ H2

[0155] wherein H C represents the thinning height, which refers to the length of the area where the tab material transitions from the coating material to the aluminum foil material part; H D represents the substrate height, which refers to the length of the coating material above the baseline of the bottom of the tab;

[0156] Setting the laser power W CL , frequency P CL of the tab left thinning part C

[0157] W = W CL , P = P CL H D ≤ y ≤ H C + H D , x = -M + l_bot

[0158] wherein M represents the tab bottom width, and l_bot represents the radius of the left bottom round corner of the tab;

[0159] Setting the laser power W CR , frequency P CR of the tab right thinning part C

[0160] W = W CR , P = P CR H D ≤ y ≤ H C + H D , x = -r_bot

[0161] Setting the laser power W D , frequency P D of the tab substrate part D

[0162] W = W D , P = P D y ≤ H D

[0163] Specifically, due to the mechanical principle of the galvanometer itself, the scanning angle of the galvanometer in X and Y directions has less error within the range of ±7°, and the error is larger when the position deviates from the center point beyond this angle range. Therefore, in the state of the material belt being static, a square of 40mm*40mm size is cut, and by measuring the size of X and Y directions of each 1mm interval respectively, the corresponding compensation data is made:

[0164] x_offset=x 理 / x 测

[0165] y_offset=y 理 / y 测

[0166] Wherein, x_offset is the x coordinate compensation ratio, y_offset is the y coordinate compensation ratio, x 理 is the theoretical coordinate value of x, x 测 is the measured coordinate value of x, y 理 is the theoretical coordinate value of y, y 测 is the measured coordinate value of y. According to the measured compensation text, the trajectory data is compensated for galvanometer distortion:

[0167] x=x*x_offset

[0168] y=y*y_offset

[0169] Specifically, the data is loaded to the motion control card, and the speed of laser cutting is controlled according to the return pulse of the encoder to change dynamically with the speed of the conveying belt. The specific method is to calculate the pulse change value in a single period first:

[0170] add_pulse=now_pulse-old_pulse

[0171] Wherein, now_pulse is the encoder pulse value of the current period, old_pulse is the pulse value of the last period, and add_pulse is the encoder pulse change value in a period. Then calculate the pulse accumulation in each period:

[0172] base_pulse=base_pulse+add_pulse

[0173] Wherein, base_pulse is the current pulse value of the single-chip microcomputer, and then the current data position is found according to the total pulse number:

[0174] data_run_num=base_pulse*data_total_num / total_pulse

[0175] Wherein, data_run_num is the current running data segment number, data_total_num is the total segment number of single tab data, total_pulse is the total pulse number of single tab pixel length, the value of which is determined by the pulse number per millimeter of the encoder mm_pulse and the total length of single tab L:

[0176] total_pulse = mm_pulse * L

[0177] The value of mm_pulse is determined by the pulse number of the encoder per round pulse_round and the stroke of the encoder per round len_round:

[0178] mm_pulse = pulse_round / len_round

[0179] Specifically, by Figure 5 According to the size diagram of the double-sided tab cut out by single tab coating, the system supports simultaneous processing of two channels, and the channel number for processing can be set on the main interface to control two sets of galvanometer devices and IPG laser devices respectively. Since the conveying direction of the material belt on the processing plane is the X direction, the two sets of galvanometer are placed with the X axis as the symmetry axis, therefore, taking channel one as the reference, channel two only needs to make the Y direction coordinate the negative value of channel one.

[0180] Specifically, after starting the system, the laser can be controlled to move the tab for periodic cutting on the processing plane.

[0181] Embodiment 2

[0182] The tab laser cutting method of the anti-tab shape of this embodiment can be used for lithium battery tab laser cutting machine, such as Figure 2 The size parameter diagram of the anti-tab shape of the tab is shown, and this embodiment includes the following specific implementation contents.

[0183] Specifically, the corresponding tab parameters are input in the tab parameter sub-window in the tab parameter setting window, including the total length of the tab L, the bottom width of the tab M, the height of the tab H2, the left bottom corner radius l_bot, the left top corner radius l_top, the right bottom corner radius r_bot, and the right top corner radius r_top; in the other shape parameter sub-window, the shape is selected as anti-tab, and the position is selected as the front of the tab. For the additional size parameters of the anti-tab in front of the tab, including the anti-tab horizontal distance W f , the anti-tab vertical height H f , the anti-tab arc diameter D f , and the anti-tab bottom arc radius R f . Set the appropriate tab speed ratio so that the tab coordinates are limited within the processing range of the anti-shake firmware.

[0184] Specifically, according to the track accuracy P and the tab speed ratio R, the step length in the Y direction is calculated:

[0185] S y = P * R

[0186] The step length in the X direction is:

[0187] S x = P

[0188] The full length T of a single tab is divided into the X direction length T x and the Y direction length T y , and the number of data segments S of a single tab is calculated:

[0189] S = T x / S x + T y / S y

[0190] Wherein, the tab full length T is the circumference of the whole tab. The tab is moving, and the laser is periodically cut on the moving tab in the processing plane.

[0191] Then, the offset value O that should be superimposed in one step in the track is calculated from the total length L of the tab and the number of data segments S

[0192] O = S / L

[0193] Taking the right bottom arc of the tab as the starting point, the right bottom arc segment coordinates are calculated:

[0194] x_rb = x_arc_rb - r_bot * sin(m * angle_arc_rb)

[0195] y_rb = y_arc_rb + (r_bot - r_bot * cos(m * angle_arc_rb))

[0196] Wherein, r_bot represents the radius of the right bottom corner of the tab, x and y are the current point coordinates, x_arc_rb and y_arc_rb are the starting point of the right bottom arc, defined as (0, 0), i.e.:

[0197] x_arc_rb = 0, y_arc_rb = 0

[0198] m is the current segment number of the right bottom arc, angle_arc_rb is the radian of the single step of the right bottom arc starting point, which is calculated from the single step length S x and the right bottom arc radius r_bot:

[0199] angle_arc_rb = S x / r_bot

[0200] Calculate the right tab height segment coordinate:

[0201] y_rh = y + S y

[0202] where S x , S y represents the step size in the X direction, the step size in the Y direction;

[0203] Calculate the right top arc segment coordinate:

[0204] x_rt = x_arc_rt - (r_top - r_top * cos(m * angle_arc_rt * R))

[0205] y_rt = y_arc_rt + r_top * sin(m * angle_arc_rt * R)

[0206] where r_top represents the radius of the right top corner of the tab, and R represents the tab speed ratio;

[0207] The right top arc starting point is:

[0208] x_arc_rt = -r_bot, y_arc_rt = H2 - r_top

[0209] The single step radian of the right top arc starting point:

[0210] angle_arc_rt = S x / r_top

[0211] Calculate the tab top straight line coordinate:

[0212] x_t = x - S x

[0213] Calculate the left top arc segment coordinate:

[0214] x_lt = x_arc_lt - l_top * sin(m * angle_arc_lt * R)

[0215] y_lt = y_arc_lt - (l_top - l_top * cos(m * angle_arc_lt * R))

[0216] where l_top represents the radius of the left top corner of the tab, and the left top arc starting point:

[0217] x_arc_lt = -M + l_top + l_bot, y_arc_lt = H2

[0218] The single step radian of the left top arc starting point:

[0219] angle_arc_lt = S x / l_top

[0220] Calculate the left segment of the tab height coordinate:

[0221] y_lh = y_lt - S y

[0222] Calculate the left bottom arc segment coordinate:

[0223] x_lb = x_arc_lb - (l_bot - l_bot * cos(m * angle_arc_lb))

[0224] y_lb = y_arc_lb - l_bot * sin(m * angle_arc_lb))

[0225] wherein l_bot represents the radius of the left bottom round of the tab, and the left bottom arc starting point:

[0226] x_arc_lb = -M + l_bot, y_arc_lb = l_bot single step radian of the left bottom arc starting point:

[0227] angle_arc_lb = S x / l_bot

[0228] Calculate the right straight line segment coordinate of the counter tab:

[0229] x_fr = x_lb - S x

[0230] Calculate the right top arc segment coordinate of the counter tab:

[0231] x_frt = x_arc_frt - R f * sin(m * angle_arc_frt)

[0232] y_frt = y_arc_frt - (R f - R f * cos(m * angle_arc_frt))

[0233] wherein the right top arc starting point:

[0234] x_arc_frt = -L + W f + D f / 2 + R f , y_arc_frt = 0

[0235] Single step radian:

[0236] angle_arc_frt = Sx / R f

[0237] Calculate the coordinates of the right segment of the negative tab height:

[0238] y_frh = y_frt - S y

[0239] Calculate the coordinates of the bottom arc segment of the negative tab:

[0240] x_fb = x_arc_fb - (D f / 2 - D f / 2*cos(m*angle_arc_fb))

[0241] y_fb = y_arc_fb + (D f / 2*sin(m*angle_arc_fb)

[0242] Where the starting point of the bottom arc of the negative tab is:

[0243] x_arc_fb = -L + W f + D f / 2, y_arc_fb = -H f + D f / 2

[0244] Single step radian:

[0245] angle_arc_fb = S x / D f / 2

[0246] Calculate the coordinates of the left segment of the negative tab height:

[0247] y_flh = y_fb + S y

[0248] Calculate the coordinates of the left top arc segment of the negative tab:

[0249] x_flt = x_arc_flt - (R f - R f *cos(m*angle_arc_flt))

[0250] y_flt = y_arc_flt + (R f *sin(m*angle_arc_flt)

[0251] Where the starting point of the left top arc of the negative tab is:

[0252] x_arc_flt = -L + W f - D f / 2, y_arc_flt = -Rf

[0253] Single step radian:

[0254] angle_arc_flt = S x / R f

[0255] Calculate the left side of the tab coordinates of the linear segment:

[0256] x_fl = x_flt - S x

[0257] Based on the above theoretical coordinate points, add offset value O to each x original coordinate:

[0258] x 偏 = x 原 + O*n

[0259] Where n is the current tab segment number of the single tab.

[0260] After adding the offset value O to each given x coordinate point, the tab motion trajectory data can be generated.

[0261] Specifically, in order to adapt to different material parts of the tab, the laser power W A and frequency P A of the tab top part A are set respectively; the laser power W B and frequency P B of the tab height part B; the laser power W CL and frequency P CL of the tab left thinning part C; the laser power W CR and frequency P CR of the tab right thinning part C; the laser power W D and frequency P D of the tab base material part D; the thinning height H C and the base material height H D ; the power and frequency of the negative tab part are consistent with those of the base material part. Through this optimization method, the cutting of the tab burr and the sticking edge is successfully reduced, and the energy efficiency of the laser is effectively improved.

[0262] The laser power W A and frequency P A of the tab top part A are set as follows:

[0263] W = W A , P = P A H2≤ y

[0264] The laser power W B and frequency P B of the tab height part B are set as follows:

[0265] W = W B , P = P B H C + H D ≤ y ≤ H2

[0266] Set the laser power W of the left thinning portion C of the tab CL , frequency P CL :

[0267] W = W CL , P = P CL H D ≤ y ≤ H C + H D , x = -M + l_bot

[0269] Set the laser power W of the right thinning portion C of the tab CR , frequency P CR :

[0270] W = W CR , P = P CR H D ≤ y ≤ H C + H D , x = -r_bot

[0271] Set the laser power W of the base material portion D of the tab D , frequency P D :

[0272] W = W D , P = P D y ≤ H D

[0273] Specifically, due to the mechanical principle of the galvanometer itself, the scanning angle of the galvanometer in the X and Y directions has less error within the range of ±7°, and the error is greater when the position deviates from the center point beyond this angle range. Therefore, in the state that the material belt is stationary, a square of 40mm*40mm size is cut, and by measuring the X and Y direction sizes of each 1mm interval respectively, corresponding compensation data is made:

[0274] x_offset = x 理 / x 测

[0275] y_offset = y 理 / y 测

[0276] Wherein, x_offset is the x coordinate compensation ratio, y_offset is the y coordinate compensation ratio, x 理 is the theoretical coordinate value of x, x 测 ​x is the measured coordinate value of x, y 理 y is the theoretical coordinate value of y, y 测 y is the measured coordinate value of y. According to the compensation text of measurement, the galvanometer distortion compensation is carried out on the track data:

[0277] x = x * x_offset

[0278] y = y * y_offset

[0279] Specifically, the data is loaded to the motion control card, and the speed of laser cutting is controlled according to the return pulse of the encoder to dynamically change with the speed of the conveying belt. The specific method is to first calculate the pulse change value in a single period:

[0280] add_pulse = now_pulse - old_pulse

[0281] Wherein, now_pulse is the encoder pulse value of the current period, old_pulse is the pulse value of the last period, and add_pulse is the encoder pulse change value in a period. Then calculate the pulse accumulation in each period:

[0282] base_pulse = base_pulse + add_pulse

[0283] Wherein, base_pulse is the current pulse value of the single-chip microcomputer, and then the current data position to be run is found according to the total pulse number:

[0284] data_run_num = base_pulse * data_total_num / total_pulse

[0285] Wherein, data_run_num is the current running data segment number, data_total_num is the total segment number of single-chip tab data, and total_pulse is the total pulse number of single-chip tab element length, which is determined by the pulse number per millimeter of the encoder mm_pulse and the total length L of the single-chip tab:

[0286] total_pulse = mm_pulse * L

[0287] The value of mm_pulse is determined by the single-turn pulse pulse_round of the encoder and the single-turn stroke len_round of the encoder:

[0288] mm_pulse = pulse_round / len_round

[0289] Specifically, from Figure 5The size of the cut double-sided tab can be known from the single-coating size specification diagram. The system supports double-channel simultaneous processing, and the channel number for processing can be set on the main interface to control two sets of galvanometer devices and IPG laser devices respectively. Since the conveying direction of the material belt on the processing plane is the X direction, and the two sets of galvanometer are placed with the X axis as the symmetry axis, therefore, taking channel one as the reference, channel two only needs to make the Y direction coordinate negative value of channel one.

[0290] Specifically, after starting the system, the laser can be controlled to periodically cut the moving pole piece on the processing plane.

[0291] Embodiment 3

[0292] The pole ear laser cutting method of the positioning hole shape of the embodiment can be used for lithium battery pole ear laser cutting machine, such as Figure 3 The size parameter specification diagram of the positioning hole-shaped tab is shown. The embodiment includes the following specific implementation contents.

[0293] Specifically, the corresponding tab parameters are input in the tab parameter sub-window in the tab parameter setting window, including the total length L of the pole piece, the bottom width M of the tab, the height H2 of the tab, the left bottom corner radius l_bot, the left top corner radius l_top, the right bottom corner radius r_bot, and the right top corner radius r_top; in the other shape parameter sub-window, the shape is selected as the positioning hole, and the position is selected as the front of the tab. For the additional size parameters of the positioning hole in front of the tab, including the horizontal distance W of the positioning hole d , the vertical distance H d of the positioning hole, the diameter D of the positioning hole arc d , and the vertical length F of the positioning hole. Set the appropriate tab speed ratio to limit the tab coordinates within the processing range of the anti-shake firmware.

[0294] Specifically, according to the trajectory accuracy P and the tab speed ratio R, the step length in the Y direction is calculated:

[0295] S y =P*R

[0296] The step length in the X direction is:

[0297] S x =P

[0298] Divide the full length T of the single tab into the X direction length T x and the Y direction length T y , and calculate the single tab data segment number S:

[0299] S=T x / S x +T y / S y

[0300] Wherein, the total length of the tab T is the circumference of the whole tab. The tab is moving, and the laser is controlled to cut the moving tab periodically on the processing plane.

[0301] Then, the offset value O that should be added to one step in the track is calculated according to the total length L of the tab and the number of data segments S

[0302] O = S / L

[0303] Taking the right bottom circular arc of the tab as the starting point, the coordinates of the right bottom circular arc segment are calculated:

[0304] x_rb = x_arc_rb - r_bot * sin(m * angle_arc_rb)

[0305] y_rb = y_arc_rb + (r_bot - r_bot * cos(m * angle_arc_rb))

[0306] Wherein, r_bot represents the radius of the right bottom circular arc of the tab, x and y are the coordinates of the current point, x_arc_rb and y_arc_rb are the starting point of the right bottom circular arc, defined as (0, 0), i.e.:

[0307] x_arc_rb = 0, y_arc_rb = 0

[0308] m is the current segment number of the right bottom circular arc, angle_arc_rb is the radian of a single step of the starting point of the right bottom circular arc, which is calculated according to the single step length S x and the radius r_bot of the right bottom circular arc:

[0309] angle_arc_rb = S x / r_bot

[0310] The coordinates of the right segment of the tab height are calculated:

[0311] y_rh = y + S y

[0312] Wherein, S x , S y represent the step length in the X direction and the step length in the Y direction;

[0313] The coordinates of the right top circular arc segment are calculated:

[0314] x_rt = x_arc_rt - (r_top - r_top * cos(m * angle_arc_rt * R))

[0315] y_rt = y_arc_rt + r_top * sin(m * angle_arc_rt * R)

[0316] wherein r_top represents the radius of the top right corner of the tab, and R represents the tab speed ratio;

[0317] The right top arc starting point is:

[0318] x_arc_rt = -r_bot, y_arc_rt = H2 - r_top

[0319] The single-step radian of the right top arc starting point is:

[0320] angle_arc_rt = S x / r_top

[0321] Calculate the tab top straight line coordinate:

[0322] x_t = x - S x

[0323] Calculate the left top arc segment coordinate:

[0324] x_lt = x_arc_lt - l_top * sin(m * angle_arc_lt * R)

[0325] 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 corner of the tab, and the left top arc starting point:

[0326] x_arc_lt = -M + l_top + l_bot, y_arc_lt = H2

[0327] The single-step radian of the left top arc starting point is:

[0328] angle_arc_lt = S x / l_top

[0329] Calculate the tab height left segment coordinate:

[0330] y_lh = y_lt - S y

[0331] Calculate the left bottom arc segment coordinate:

[0332] x_lb = x_arc_lb - (l_bot - l_bot * cos(m * angle_arc_lb))

[0333] y_lb = y_arc_lb - l_bot * sin(m * angle_arc_lb))

[0334] wherein l_bot represents the radius of the left bottom corner of the tab, and the left bottom arc starting point:

[0335] x_arc_lb = -M + l_bot, y_arc_lb = l_bot

[0336] Single step radian of left bottom arc start point:

[0337] angle_arc_lb = S x / l_bot

[0338] Calculate the coordinates of the right straight line segment of the positioning hole:

[0339] x_dr = x_lb - S x

[0340] Calculate the coordinates of the descending segment of the positioning hole:

[0341] y_dd = y_lb - S y

[0342] Calculate the coordinates of the right top arc segment of the positioning hole:

[0343] x_drt = y_arc_drt + D d * sin(m * angle_arc_drt * R)

[0344] y_drt = x_arc_drt - (D d - D d * cos(m * angle_arc_drt * R))

[0345] Wherein, the right top arc start point of the positioning hole:

[0346] x_arc_drt = -L + W d , y_arc_drt = -H d + F / 2

[0347] Single step radian:

[0348] angle_arc_drt = S x / D d / 2

[0349] Calculate the coordinates of the right segment of the positioning hole height:

[0350] y_drh = y_drt - S y

[0351] Calculate the coordinates of the bottom arc segment of the positioning hole:

[0352] x_db = x_arc_db - (D d / 2 - D d / 2 * cos(m * angle_arc_db * R))

[0353] y_db = y_arc_db + D d / 2 * sin(m * angle_arc_db * R)

[0354] Where the left bottom arc start point is:

[0355] x_arc_db = -L + W d + D d / 2, y_arc_db = -H d - F / 2 + D d / 2

[0356] Single step radian:

[0357] angle_arc_db = S x / D d / 2

[0358] Calculate the left segment coordinate of the positioning hole height:

[0359] y_dlh = y_db + S y

[0360] Calculate the left top arc segment coordinate of the positioning hole:

[0361] x_dlt = x_arc_dlt - (D d - D d * cos(m * angle_arc_dlt * R))

[0362] y_dlt = y_arc_dlt - (D d * sin(m * angle_arc_dlt * R))

[0363] Where the left bottom arc start point is:

[0364] x_arc_dlt = -L + W d - D d / 2, y_arc_dlt = -H d + F / 2 - D d / 2

[0365] Single step radian:

[0366] angle_arc_dlt = S x / D d / 2

[0367] Calculate the left segment coordinate of the positioning hole height:

[0368] y_du = y_dlt + S y

[0369] Calculate the coordinates of the straight line segment on the left side of the positioning hole:

[0370] x_dl=x_dlt-S x

[0371] Based on the above theoretical coordinate points, an offset value O is superimposed on each x-coordinate.

[0372] x 偏 =x 原 +O*n

[0373] Where n is the current pole segment number of a single pole piece.

[0374] By superimposing an offset value O at each given x-coordinate point, the electrode movement trajectory data can be generated.

[0375] Specifically, in order to accommodate different material parts of the electrode, the laser power W of the top part A of the electrode is set separately. A Frequency P A The laser power W at the height of the electrode portion B B Frequency P B ; Laser power W for the left thinning section of the electrode tab CL Frequency P CL ; Laser power W for the right-side thinned portion of the electrode CR Frequency P CR ; Laser power W of the electrode substrate part D D Frequency P D Thinning height H C substrate height H D This optimization method successfully reduced burrs and adhesion on the cut electrodes and effectively improved the laser's energy efficiency.

[0376] Set the laser power W at the top A of the electrode. A Frequency P A :

[0377] W = W A P = P A H2≤y

[0378] The laser power W is set at the height of the electrode portion B. B Frequency P B :

[0379] W = W B P = P B H C +H D ≤y≤H2

[0380] H C The thinning height refers to the length of the area where the tab material transitions from the coating material to the aluminum foil material; HD H represents the height of the substrate, which means the length of the coating material above the baseline of the bottom of the tab;

[0381] Laser power W of the left thinning part C of the tab is set CL , frequency P CL :

[0382] W = W CL , P = P CL H D ≤ y ≤ H C + H D , x = -M + l_bot

[0383] Laser power W of the right thinning part C of the tab is set CR , frequency P CR :

[0384] W = W CR , P = P CR H D ≤ y ≤ H C + H D , x = -r_bot

[0385] Laser power W of the substrate part D of the tab is set D , frequency P D :

[0386] W = W D , P = P D 0 ≤ y ≤ H D

[0387] Since the descending straight segment of the positioning hole is long, the positioning hole part uses S y step to walk, so the power and frequency of the positioning hole part are consistent with the height part of the tab, and in the rising and descending parts of the positioning hole, the power and frequency should be set to 0 to avoid laser light. Set the laser power of the positioning hole part:

[0388] W = 0, P = 0 - H d + F / 2 < y < 0

[0389] W = W B , P = P B - H d - F / 2 ≤ y ≤ -H d + F / 2

[0390] Specifically, due to the mechanical principle of the galvanometer itself, the scanning angle of the galvanometer in X and Y directions has less error within the range of ±7°, and the error is larger when the scanning angle is beyond the range. Therefore, when cutting a square of 40mm*40mm in size under the condition that the material belt is static, the corresponding compensation data is made by measuring the size of X and Y directions in each 1mm interval respectively:

[0391] x_offset=x 理 / x 测

[0392] y_offset=y 理 / y 测

[0393] wherein x_offset is the compensation ratio of x coordinate, y_offset is the compensation ratio of y coordinate, x 理 is the theoretical coordinate value of x, x 测 is the measured coordinate value of x, y 理 is the theoretical coordinate value of y, and y 测 is the measured coordinate value of y. According to the measured compensation text, the galvanometer distortion compensation is performed on the track data:

[0394] x=x*x_offset

[0395] y=y*y_offset

[0396] Specifically, the data is loaded to the motion control card, and the speed of the laser cutting is dynamically changed according to the return pulse of the encoder. Specifically, the pulse change value in a single period is calculated first:

[0397] add_pulse=now_pulse-old_pulse

[0398] wherein now_pulse is the encoder pulse value of the current period, old_pulse is the pulse value of the last period, and add_pulse is the encoder pulse change value in a period. Then, the pulse accumulation in each period is calculated:

[0399] base_pulse=base_pulse+add_pulse

[0400] wherein base_pulse is the current pulse value of the single-chip microcomputer. Then, the data position to be run currently is found according to the total pulse number:

[0401] data_run_num=base_pulse*data_total_num / total_pulse

[0402] Wherein, the data_run_num is the current running data segment number, the data_total_num is the single tab data total segment number, the total_pulse is the total pulse number of the single tab pixel length, the value is determined by the encoder pulse number per millimeter mm_pulse and the single tab total length L:

[0403] total_pulse = mm_pulse * L

[0404] The value of mm_pulse is determined by the encoder single round pulse pulse_round and the encoder single round stroke len_round:

[0405] mm_pulse = pulse_round / len_round

[0406] Specifically, by Figure 5 The size of the double-sided tab cut by single tab coating is shown in the figure, and the system supports double-channel simultaneous processing. The channel number of the processing can be set on the main interface, and two sets of galvanometer devices and IPG laser devices are controlled respectively. Since the conveying direction of the material belt on the processing plane is the X direction, and the two sets of galvanometer are placed with the X axis as the symmetry axis, therefore, taking channel one as the reference, channel two only needs to make the Y direction coordinate as the negative value of channel one.

[0407] Specifically, after starting the system, the laser can be controlled to move on the processing plane to periodically cut the pole piece.

[0408] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details, and the application is not limited to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited by the claims and their entire scope and equivalents.

Claims

1. A method of laser cutting lithium battery tabs for accomplishing cutting of a variety of tab shapes; characterized by: The whole tab pattern is segmented, and different speed ratio settings and laser parameter settings are set according to the subdivision path segments, including the following steps: S1, setting the shape and size parameters of the to-be-cut tab, and setting the tab speed ratio according to the selected shape and size parameters; the setting of the tab speed ratio is as follows: the coordinate step length in the Y direction is R times of that in the X direction, that is, the laser speed in the Y direction is R times of that in the X direction; S2, calculating the step length in the Y direction and the step length in the X direction according to the trajectory accuracy and the tab speed ratio, calculating the number of data segments of a single tab according to the total length of a single tab and the trajectory accuracy, and then calculating the offset value that should be superimposed in a step in the trajectory according to the total length of the tab and the number of data segments, to generate tab motion trajectory data; S3, setting the laser energy parameters power and frequency of the tab top part, the tab height part, the thinning part and the base material part respectively, and generating tab laser energy parameter data; S4, cutting a certain size of square in the state that the material belt is stationary, measuring the X and Y direction size of each millimeter interval respectively, making corresponding compensation data, and performing galvanometer distortion compensation in the finally obtained coordinates; S5, loading the data to the motion control card, starting the conveying belt to move the to-be-cut tab, and controlling the speed of the laser cutting to dynamically change with the speed of the conveying belt according to the return pulse of the encoder; S6, starting the system to control the laser to periodically cut the moving tab on the processing plane.

2. A method of laser cutting lithium battery tabs as claimed in claim 1, wherein: The shape of the to-be-cut tab includes a normal tab, a reverse tab and a positioning hole.

3. A method of laser cutting lithium battery tabs as claimed in claim 1, wherein: The size parameters include the total length of the monolithic tab L, the tab bottom width M, the tab height the tab right side bottom round r_bot, the tab right side top round r_top, the tab left side top round l_top, and the tab left side bottom round l_bot.

4. A method of laser cutting lithium battery tabs as defined in claim 1, wherein: According to the trajectory accuracy P And the tab speed ratio R Calculate the step in the Y direction: The step length in the X direction: The single tab full-length T is divided into an X-direction length and a Y-direction length , and the number of data segments S of the single tab is calculated. Then, the offset value O that should be superimposed in a step in the trajectory is calculated according to the total length L of the tab and the number of data segments S: The offset value O is superimposed at each given x coordinate point, and the tab motion trajectory data is generated.

5. A method of laser cutting lithium battery tabs as defined in claim 1, wherein: Taking the right bottom circular arc of the tab as the starting point, the right bottom circular arc segment coordinates are calculated: wherein, represents the radius of the right bottom corner of the tab, x and y is the current point coordinate, x_arc_rb and y_ar c_ rb is the starting point of the right bottom arc, defined as (0, 0), i.e.: ， m is the current number of segments for the right bottom arc, angle_arc_rb is the radian of the single step of the right bottom arc start point, whose value is determined by the single step length S x and the right bottom arc radius R r_bot is calculated as The tab height right segment coordinates are calculated: wherein , denotes the step size in the X direction, the step size in the Y direction; The right top circular arc segment coordinates are calculated: wherein, r_top R represents the radius of the top right corner of the tab, and R represents the tab speed ratio. ， The radian of a single step of the starting point of the right top circular arc: The tab top straight line coordinates are calculated: The left top circular arc segment coordinates are calculated: wherein l_top Rl represents the radius of the top left corner of the tab, left top arc starting point: ， The radian of a single step of the starting point of the left top circular arc: The tab height left segment coordinates are calculated: The left bottom circular arc segment coordinates are calculated: wherein l_bot Rl represents the radius of the bottom left corner of the tab, and the starting point of the left bottom arc: ， The radian of a single step of the starting point of the left bottom circular arc: The tab bottom straight line coordinates are calculated: Based on the above theoretical coordinate points, the offset value O is superimposed at each x original coordinate: Wherein, n is the current tab segment number of a single tab.

6. A method of laser cutting lithium battery tabs as defined in claim 1, characterized by: Laser power to set tab top portion A , frequency Laser power to tab height portion B , frequency Laser power to left thinning portion C , frequency Laser power to right thinning portion C , frequency ; Substrate portion D laser power Frequency Laser energy parameter data for tab generation.

7. A method of laser cutting lithium battery tabs as claimed in claim 6, characterized by: Setting the laser power for the tab top A , frequency : ， In the formula, W and P respectively represent the power and frequency of the current coordinate point; is the height of the tab; y is the coordinate value of the current position; Setting the laser power for the tab height portion B , frequency : In the formula, represents a thinning height, which refers to the length of the region where the tab material transitions from the coating material to the aluminum foil material portion; represents a substrate height, which refers to the length of the coating material above the baseline of the bottom of the tab. Laser power for setting the tab left thinning portion C , frequency : In the formula, M represents the tab bottom width, and l_bot represents the radius of the left bottom circular corner of the tab. Laser power for setting the right thinning portion C of the tab , frequency : Setting tab base material portion d laser power , frequency : 。

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