Cutting and Coiling Speed Control Method and Device

Abstract

The present invention discloses a method and device for controlling the cutting and winding speed. The total winding time for each pole piece wound by a winding machine is calculated. Based on the total winding time, the running speed of the first main drive and the second main drive speed are determined. Finally, according to the first main drive speed and the cutting linear speed, the running speed of the first main drive is controlled, and according to the second main drive speed, the running speed of the second main drive is controlled, realizing the planning of the pasting speed and the laser cutting speed according to the winding working rhythm, avoiding the defect of jamming caused by the inconsistent running rhythm of the cutting and winding integrated machine, and solving the technical problem that the prior art lacks a method for planning the pasting speed and the laser speed of the cutting and winding integrated machine, resulting in low cutting and winding efficiency of the cutting and winding integrated machine.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell processing technology, and in particular to a method and device for controlling the cutting and winding speed. Background Art

[0002] In a battery cell pole piece cutting and winding integrated machine, the pole piece is first film-cut at the laser cutting station, pasted with glue through a path, and the pole core is wound and formed at the winding station. During the operation of the cutting and winding integrated machine, the winding part needs to start and stop when switching stations, and the glue pasting part also needs to start and stop for glue pasting. However, in order to ensure the cutting quality, the laser die-cutting part needs to run at a constant speed. Therefore, it is necessary to plan the glue pasting speed and the laser speed according to the working rhythm of winding, so that the cutting and winding integrated machine can efficiently complete the pole core cutting and winding work. At present, there is no effective method for planning the glue pasting speed and the laser speed of the cutting and winding integrated machine to make the laser die-cutting part of the cutting and winding integrated machine run at a constant speed. Summary of the Invention

[0003] The present invention provides a method and device for controlling the cutting and winding speed, which are used to solve the technical problem that the prior art lacks a method for planning the glue pasting speed and the laser speed of the cutting and winding integrated machine, resulting in low cutting and winding efficiency of the cutting and winding integrated machine.

[0004] In view of this, a first aspect of the present invention provides a method for controlling the cutting and winding speed, including:

[0005] Calculating the total winding time of a single battery cell according to the winding time and the winding auxiliary time of a single battery cell;

[0006] Determining the first main driving speed of laser cutting and the second main driving speed of glue pasting according to the total winding time of a single battery cell;

[0007] Controlling the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0008] Optionally, the winding time of a single battery cell includes the winding acceleration time and the winding deceleration time, or includes the winding acceleration time, the winding constant speed time and the winding deceleration time.

[0009] Optionally, the winding time of a single battery cell includes the pre-winding acceleration time, the pre-winding constant speed time, the normal winding acceleration time, the normal winding constant speed time, the normal winding deceleration time, the chasing cutting constant speed time and the chasing cutting deceleration time.

[0010] Optionally, the winding auxiliary time includes the tailing time, the film combining time, the needle threading time and the diaphragm cutting time.

[0011] Optionally, determining the first main driving speed of laser cutting and the second main driving speed of glue pasting according to the total winding time of a single battery cell includes:

[0012] Calculate the first main drive speed of laser cutting according to the total winding time of a single battery cell;

[0013] Calculate the running time of tape sticking according to the total winding time of a single battery cell;

[0014] Calculate the second main drive speed according to the running time of tape sticking;

[0015] Control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0016] Optionally, calculating the first main drive speed of laser cutting according to the total winding time of a single battery cell includes:

[0017] Calculate the theoretical speed of laser cutting according to the total winding time of a single battery cell;

[0018] Calculate the first main drive speed of laser cutting according to the theoretical speed of laser cutting.

[0019] Optionally, the calculation formula for the theoretical speed of laser cutting is:

[0020]

[0021] Wherein, V1 is the theoretical speed of laser cutting, L is the length of a single pole piece, and T is the total winding time of a single pole piece;

[0022] The calculation formula for the first main drive speed of laser cutting is:

[0023] V2 = V1 × K1

[0024] K1 = 1 - (PrePos1 - Modpos1) × 0.03

[0025] Wherein, V2 is the first main drive speed of laser cutting, K1 is the first speed adaptation coefficient, PrePos1 is the current position of the unwinding buffer floating roller, Mpdpos1 is the middle position of the unwinding buffer floating roller, and 0.03 is the proportional constant.

[0026] Optionally, calculating the running time of tape sticking according to the total winding time of a single battery cell includes:

[0027] Judge the target number of tapes to be stuck on a single battery cell. If the target number of tapes to be stuck on a single battery cell is one tape, the calculation formula for the running time of tape sticking is:

[0028] T3 = T - T4

[0029] Wherein, T3 is the running time of tape sticking of a single battery cell, T is the total winding time of a single battery cell, and T4 is the tape sticking time;

[0030] If the target number of tapes to be stuck on a single battery cell is two tapes, the calculation formula for the running time of tape sticking is:

[0031] T3 = T - T5 - T6 - T7

[0032] Wherein, T5 is the time for applying the first layer of adhesive, T6 is the time from the position of the first layer of adhesive to the position of the second layer of adhesive, and T7 is the time for applying the second layer of adhesive.

[0033] Optionally, calculating the second main drive speed according to the adhesive application running time includes:

[0034] Calculating the theoretical speed of the second main drive according to the adhesive application running time;

[0035] Calculating the second main drive speed according to the theoretical speed of the second main drive.

[0036] Optionally, the calculation formula for the second main drive speed is:

[0037] V6 = V5 × K2

[0038] K2 = 1 - (PrePos2 - Modpos2) × 0.0003

[0039] Wherein, V6 is the second main drive speed, V5 is the theoretical speed of the second main drive, K2 is the second speed adaptation coefficient, PrePos2 is the current position of the floating roller in the second buffer zone, Modpos2 is the middle position of the floating roller in the second buffer zone, and 0.0003 is the proportional constant.

[0040] Optionally, it further includes:

[0041] Obtaining the cutting linear speed, wherein the cutting linear speed is the running speed of the first main drive when the splicing tape in the cell pole piece strip passes through the laser cutting position;

[0042] When the splicing tape of the cell pole piece strip passes through the laser cutting position, controlling the first main drive to run at the cutting linear speed.

[0043] Optionally, controlling the second main drive to run at the second main drive speed includes:

[0044] Judging whether the distance between the adhesive application positioning point and the adhesive application position is within 50 mm. If so, judging whether the second main drive stops driving;

[0045] If the second main drive stops driving, controlling the second main drive to run at a speed of 50 mm / s after restart until it reaches the adhesive application position;

[0046] If the second main drive does not stop driving, controlling the second main drive to run at the second main drive speed.

[0047] The second aspect of the present invention provides a cutting and winding speed control device, including:

[0048] The winding time calculation module is used to calculate the total winding time of a single battery cell based on the winding time and winding auxiliary time of the single battery cell;

[0049] The main drive speed calculation module is used to determine the first main drive speed for laser cutting and the second main drive speed for tape sticking according to the total winding time of a single battery cell;

[0050] The control module is used to control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0051] As can be seen from the above technical solutions, the cutting and winding speed control method and device provided by the present invention have the following advantages:

[0052] The cutting and winding speed control method provided by the present invention calculates the total winding time for each pole piece wound by the winding machine, determines the running speed of the first main drive and the second main drive speed based on the total winding time, and finally controls the running speed of the first main drive according to the first main drive speed and the cutting straight line speed, and controls the running speed of the second main drive according to the second main drive speed, realizing the planning of the tape sticking speed and laser cutting speed according to the winding work rhythm, avoiding the defect of jamming caused by the incoordination of the running rhythm of the cutting and winding integrated machine, and solving the technical problem that the existing technology lacks a method for planning the tape sticking speed and laser speed of the cutting and winding integrated machine, resulting in low cutting and winding efficiency of the cutting and winding integrated machine.

[0053] The cutting and winding speed control device provided by the present invention is used to execute the cutting and winding speed control method provided by the present invention. Its principle and the achieved technical effects are the same as those of the cutting and winding speed control method provided by the present invention, and will not be elaborated here. Description of the Drawings

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0055] Figure 1 It is a schematic flow chart of a cutting and winding speed control method provided by the present invention;

[0056] Figure 2 It is a schematic structural diagram of a battery cell pole piece cutting and winding integrated machine provided by the present invention;

[0057] Figure 3 It is a schematic diagram of the cycle for the winding machine to process a single battery cell provided by the present invention;

[0058] Figure 4Schematic structural diagram of a cutting and winding speed control device provided in the present invention. Detailed implementation manners

[0059] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0060] For ease of understanding, please refer to Figure 1 , an embodiment of a cutting and winding speed control method provided in the present invention includes:

[0061] Step 101: Calculate the total winding time of a single battery cell according to the winding time and winding auxiliary time of the single battery cell.

[0062] It should be noted that the structure of the battery cell pole piece cutting and winding integrated machine is as Figure 2 shown. The unwinding motor unwinds, and after passing through the unwinding buffer, the first main drive controls laser cutting, the first buffer area, pole piece gluing, the second buffer area, the third buffer area, the third main drive, the tension pendulum, the length measuring encoder, sheet feeding, and then reaches the winding needle for winding. The unwinding battery cell pole piece tape is unwound at a constant linear speed during the laser cutting process under the action of the unwinding motor, and reaches the laser cutting position through the unwinding buffer for pole piece cutting and forming. The laser cutting speed is controlled by the first main drive. To ensure the laser cutting effect, the linear speed of the first main drive for laser cutting must be stable. After laser cutting, it passes through the first buffer area for storing sheets. The purpose of the first buffer area is to still enable laser cutting when the pole piece gluing pauses in the front. The second main drive is the main drive for controlling the gluing speed. The second main drive positions according to the planned speed. The sum of the gluing positioning time and the gluing time is the beat time of a single battery cell. To solve the problem of not affecting the winding of the winding needle during gluing, the second buffer area is designed. During the winding process, to ensure buffer stability and keep the beat as consistent as possible, it is required that the winding needle (i.e., the winding head) synchronizes gluing when completing the station change, and the third buffer area is also designed to adjust the sheet length. The third main drive and the tension pendulum in the winding part can better control the winding linear speed and winding tension. The length measuring encoder is used to detect the length and speed of the winding material. The sheet feeding mechanism is responsible for sending the material to the winding needle for winding. Process deviation corrections 1, 2, and 3 are used to ensure that the material can maintain a certain position without deviation during movement.

[0063] The time for the winding machine to process a single battery cell includes the winding time and the winding auxiliary time. The winding auxiliary time includes the finishing time, the film combining time, the needle threading time, the diaphragm cutting time, etc. If the winding head of the winding machine has more than one working station, the winding auxiliary time should also include the time for changing the working station. The winding time is determined according to the specific application scenario and usually includes the winding acceleration time and the winding deceleration time, and may also include the winding constant speed time. Preferably, as Figure 3 shown, the winding time of a single battery cell includes the pre-winding acceleration time, the pre-winding constant speed time, the normal winding acceleration time, the normal winding constant speed time, the normal winding deceleration time, the chasing cutting constant speed time, and the chasing cutting deceleration time. Therefore, the calculation formula for the winding time of a single battery cell is:

[0064] T1 = t 11 + t 12 + t 13 + t 14 + t 15 + t 16 + t 17

[0065] wherein, T1 is the winding time of a single battery cell, t 11 is the pre-winding acceleration time, t 12 is the pre-winding constant speed time, t 13 is the normal winding acceleration time, t 14 is the normal winding constant speed time, t 15 is the normal winding deceleration time, t 16 is the chasing cutting constant speed time, t 17 is the chasing cutting deceleration time.

[0066] The winding auxiliary time can be represented by T2.

[0067] Therefore, the total winding time T of a single battery cell is: T = T1 + T2.

[0068] Step 102: Determine the first main drive speed for laser cutting and the second main drive speed for pasting according to the total winding time of a single battery cell.

[0069] It should be noted that the theoretical speed of laser cutting can be calculated based on the total winding time T of a single battery cell calculated in step 101. Specifically, assuming the length of a single battery cell is L, the theoretical speed V1 of laser cutting can be calculated as:

[0070]

[0071] To eliminate the cumulative deviation during the operation of the first buffer zone, a speed adaptive coefficient is often superimposed, denoted as the first speed adaptive coefficient K1. The calculation formula for the first speed adaptive coefficient K1 is:

[0072] K1 = 1 - (PrePos1 - Modpos1) × 0.03

[0073] The first main drive speed is denoted as V2, and the calculation formula for the first main drive speed V2 is:

[0074] V2 = V1 × K1.

[0075] Control the first main drive to run at the first main drive speed V2.

[0076] Since there will be a splicing part in the electrode tab strip of the battery cell in the actual application scenario, when the splicing part passes through the laser cutting position, the laser needs to increase the power and run at a reduced speed to cut the splicing edge. Therefore, when detecting the splicing, it is often necessary to switch the cutting linear speed, and the cutting linear speed is set to V3 = 300 mm / s, that is, when the splicing part of the electrode tab strip of the battery cell passes through the laser cutting position, control the first main drive to run at the cutting linear speed V3 = 300 mm / s.

[0077] The second main drive speed can also be obtained according to the total winding time of a single battery cell. Specifically, first calculate the gluing running time according to the total winding time of a single battery cell, and then calculate the second main drive speed according to the gluing running time.

[0078] It should be noted that there may be two cases for gluing: one is that only one layer of glue needs to be applied, and the other is that two layers of glue need to be applied. Therefore, for the two gluing cases, calculate the gluing running time based on the total winding time of a single battery cell respectively.

[0079] Specifically, if the target number of glue applications for a single battery cell is one layer of glue, the calculation formula for the gluing running time is:

[0080] T3 = T - T4

[0081] Wherein, T3 is the gluing running time of a single battery cell, T is the total winding time of a single battery cell, and T4 is the gluing time.

[0082] If the target number of glue applications for a single battery cell is two layers of glue, the calculation formula for the gluing running time is:

[0083] T3 = T - T5 - T6 - T7

[0084] Wherein, T5 is the time for applying the first layer of glue, T6 is the time from the position of the first layer of glue to the position of the second layer of glue, and T7 is the time for applying the second layer of glue.

[0085] For the second main drive speed, it can be calculated based on the tape pasting operation time. Specifically, first calculate the theoretical speed V5 of the second main drive according to the tape pasting operation time, and then calculate the second main drive speed V6 based on the theoretical speed V5 of the second main drive. The theoretical speed V5 of the second main drive can be calculated using the Omron HC_HighSpeedcontro function module based on the sheet length L of a single battery cell and the tape pasting operation time T3 of a single battery cell. To eliminate the cumulative deviation during the operation of the second buffer, a speed adaptive coefficient will also be superimposed, denoted as the second speed adaptive coefficient K2. The calculation formula for the second speed adaptive coefficient K2 is:

[0086] K2 = 1 - (PrePos2 - Modpos2) × 0.0003

[0087] Where, PrePos2 is the current position of the floating roller in the second buffer, Modpos2 is the middle position of the floating roller in the second buffer, and 0.0003 is a proportional constant.

[0088] Therefore, the calculation formula for the second main drive speed V6 is:

[0089] V6 = V5 × K2.

[0090] Step 103: Control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0091] It should be noted that after obtaining the first main drive speed calculated based on the total winding time T of a single battery cell and the second main drive speed for tape pasting, for the first main drive, control the first main drive to run at the first main drive speed. The operation of the first main drive speed can be determined for two cases: the non-tape splicing position and the tape splicing position. Run at the first main drive speed V2 at the non-tape splicing position of the battery cell pole piece strip, and run at the cut straight line speed V3 = 300 mm / s at the tape splicing position. For the second main drive, run at the second main drive speed V6.

[0092] The cut-winding speed control method provided by the present invention calculates the total winding time for each pole piece wound by the winding machine, determines the operating speed of the first main drive and the second main drive based on the total winding time, and finally controls the operating speed of the first main drive according to the first main drive speed and the cut straight line speed, and controls the operating speed of the second main drive according to the second main drive speed, realizing the planning of the tape pasting speed and the laser cutting speed according to the winding work rhythm, avoiding the defect of jamming caused by the incoordination of the operating rhythm of the cut-winding integrated machine, and solving the technical problem that the prior art lacks a method for planning the tape pasting speed and the laser speed of the cut-winding integrated machine, resulting in low cut-winding efficiency of the cut-winding integrated machine.

[0093] In one embodiment, when the tape - sticking positioning point is within 50 mm from the tape - sticking position, if the second main drive stops running due to an alarm or other reasons, when the second main drive starts up next time, its running speed will be limited to 50 mm / s until the tape reaches the tape - sticking position. Therefore, for the running speed control of the second main drive, it is possible to first determine whether the tape - sticking positioning point is within 50 mm from the tape - sticking position. If so, then determine whether the second main drive has stopped driving. If the second main drive has stopped driving, then control the second main drive to run at a speed of 50 mm / s after restarting until it reaches the tape - sticking position. If the second main drive has not stopped driving, then control the second main drive to run at the speed of the second main drive.

[0094] For ease of understanding, please refer to Figure 4 , a cutting and winding speed control device is provided in the present invention, including:

[0095] A winding time calculation module, configured to calculate the total winding time of a single battery cell according to the winding time and winding auxiliary time of the single battery cell;

[0096] A main drive speed calculation module, configured to determine the first main drive speed for laser cutting and the second main drive speed for tape - sticking according to the total winding time of a single battery cell;

[0097] A control module, configured to control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0098] It further includes a pre - processing module;

[0099] The pre - processing module is used for:

[0100] Calculating the winding time and winding auxiliary time of a single battery cell.

[0101] The winding time of a single battery cell includes the winding acceleration time and the winding deceleration time.

[0102] The winding time of a single battery cell further includes the winding constant - speed time.

[0103] The winding time of a single battery cell includes the pre - winding acceleration time, the pre - winding constant - speed time, the normal winding acceleration time, the normal winding constant - speed time, the normal winding deceleration time, the chasing - cutting constant - speed time, and the chasing - cutting deceleration time.

[0104] The winding auxiliary time includes the finishing time, the film - combining time, the needle - threading time, and the diaphragm - cutting time.

[0105] The main drive speed calculation module is specifically used for:

[0106] Calculating the first main drive speed for laser cutting according to the total winding time of a single battery cell;

[0107] Calculating the running time for tape - sticking according to the total winding time of a single battery cell;

[0108] Calculate the second main drive speed based on the taping running time;

[0109] Control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed.

[0110] Calculate the first main drive speed for laser cutting based on the total winding time of a single battery cell, including:

[0111] Calculate the theoretical speed of laser cutting based on the total winding time of a single battery cell;

[0112] Calculate the first main drive speed for laser cutting based on the theoretical speed of laser cutting.

[0113] The calculation formula for the theoretical speed of laser cutting is:

[0114]

[0115] Wherein, V1 is the theoretical speed of laser cutting, L is the length of a single pole piece, and T is the total winding time of a single pole piece;

[0116] The calculation formula for the first main drive speed of laser cutting is:

[0117] V2 = V1 × K1

[0118] K1 = 1 - (PrePos1 - Modpos1) × 0.03

[0119] Wherein, V2 is the first main drive speed of laser cutting, K1 is the first speed adaptive coefficient, PrePos1 is the current position of the unwind buffer floating roller, Mpdpos1 is the middle position of the unwind buffer floating roller, and 0.03 is the proportional constant.

[0120] Calculate the taping running time based on the total winding time of a single battery cell, including:

[0121] Judge the target taping quantity of a single battery cell. If the target taping quantity of a single battery cell is one layer of tape, the calculation formula for the taping running time is:

[0122] T3 = T - T4

[0123] Wherein, T3 is the taping running time of a single battery cell, T is the total winding time of a single battery cell, and T4 is the taping time;

[0124] If the target taping quantity of a single battery cell is two layers of tape, the calculation formula for the taping running time is:

[0125] T3 = T - T5 - T6 - T7

[0126] Among them, T5 is the time for applying the first layer of glue, T6 is the time from the position of the first layer of glue to the position of the second layer of glue, and T7 is the time for applying the second layer of glue.

[0127] Calculating the second main drive speed according to the glue application running time includes:

[0128] Calculating the theoretical speed of the second main drive according to the glue application running time;

[0129] Calculating the second main drive speed according to the theoretical speed of the second main drive.

[0130] The calculation formula for the second main drive speed is:

[0131] V6 = V5 × K2

[0132] K2 = 1 - (PrePos2 - Modpos2) × 0.0003

[0133] Among them, V6 is the second main drive speed, V5 is the theoretical speed of the second main drive, K2 is the second speed adaptation coefficient, PrePos2 is the current position of the floating roller in the second buffer area, Modpos2 is the middle position of the floating roller in the second buffer area, and 0.0003 is the proportional constant.

[0134] The control module is further configured to:

[0135] Obtain the cutting linear speed, where the cutting linear speed is the running speed of the first main drive when the joint in the core pole piece strip passes through the laser cutting position;

[0136] When the joint of the core pole piece strip passes through the laser cutting position, control the first main drive to run at the cutting linear speed.

[0137] Controlling the second main drive to run at the second main drive speed includes:

[0138] Judge whether the distance between the glue application positioning point and the glue application position is within 50 mm. If so, judge whether the second main drive stops driving;

[0139] If the second main drive stops driving, control the second main drive to run at a speed of 50 mm / s after restart until it reaches the glue application position;

[0140] If the second main drive does not stop driving, control the second main drive to run at the second main drive speed.

[0141] The cutting and winding speed control device provided by the present invention is used to execute the cutting and winding speed control method provided by the present invention. Its principle and the obtained technical effects are the same as those of the cutting and winding speed control method provided by the present invention, and will not be elaborated here.

[0142] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the cutting and winding speed, characterized in that, including: calculating the total winding time of a single cell based on the winding time and winding assist time of the single cell; determining the first main drive speed for laser cutting and the second main drive speed for pasting based on the total winding time of the single cell; controlling the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed; determining the first main drive speed for laser cutting and the second main drive speed for pasting based on the total winding time of the single cell, including: calculating the theoretical speed of laser cutting based on the total winding time of the single cell; calculating the first main drive speed for laser cutting based on the theoretical speed of laser cutting; calculating the pasting running time based on the total winding time of the single cell; calculating the theoretical speed of the second main drive based on the pasting running time; calculating the second main drive speed based on the theoretical speed of the second main drive; the calculation formula for the theoretical speed of laser cutting is: where, V1 is the theoretical speed of laser cutting, L is the length of a single pole piece, and T is the total winding time of a single pole piece; the calculation formula for the first main drive speed of laser cutting is: V2 = V1 × K1 where, V2 is the first main drive speed of laser cutting, and K1 is the first speed adaptive coefficient; the calculation formula for the second main drive speed is: V6 = V5 × K2 where, V6 is the second main drive speed, V5 is the theoretical speed of the second main drive, and K2 is the second speed adaptive coefficient; the calculation formula for the first speed adaptive coefficient is: K1 = 1 - (PrePos1 - Modpos1) × 0.03 where, PrePos1 is the current position of the unwind buffer floating roller, Mpdpos1 is the middle position of the unwind buffer floating roller, and 0.03 is the proportional constant; the calculation formula for the second speed adaptive coefficient is: K2 = 1 - (PrePos2 - Modpos2) × 0.0003 where, PrePos2 is the current position of the second buffer floating roller, Modpos2 is the middle position of the second buffer floating roller, and 0.0003 is the proportional constant.

2. The cutting and winding speed control method according to claim 1, wherein The winding time of a single cell includes the winding acceleration time and the winding deceleration time, or includes the winding acceleration time, the winding constant speed time, and the winding deceleration time.

3. The cutting and winding speed control method according to claim 2, wherein The winding time of a single cell includes the pre-winding acceleration time, the pre-winding constant speed time, the normal winding acceleration time, the normal winding constant speed time, the normal winding deceleration time, the chase cutting constant speed time, and the chase cutting deceleration time.

4. The cutting and winding speed control method according to claim 1, wherein The winding assist time includes the finishing time, the film combining time, the needle threading time, and the diaphragm cutting time.

5. The cutting and winding speed control method according to claim 1, characterized in that calculating the pasting running time based on the total winding time of the single cell, including: judging the target pasting quantity of the single cell. If the target pasting quantity of the single cell is one layer of paste, the calculation formula for the pasting running time is: T3 = T - T4 where, T3 is the pasting running time of the single cell, T is the total winding time of the single cell, and T4 is the pasting time; If the target pasting quantity of the single cell is two layers of paste, the calculation formula for the pasting running time is: T3 = T - T5 - T6 - T7 where, T5 is the time for pasting the first layer of paste, T6 is the time from the position of the first layer of paste to the position of the second layer of paste, and T7 is the time for pasting the second layer of paste.

6. The cutting and winding speed control method according to claim 1, wherein also including: Obtain the cutting linear speed, where the cutting linear speed is the first main drive running speed when the splicing tape in the cell pole piece strip passes through the laser cutting position; When the splicing tape of the cell pole piece strip passes through the laser cutting position, control the first main drive to run at the cutting linear speed.

7. The cutting and winding speed control method according to claim 1, wherein Controlling the second main drive to run at the second main drive speed includes: Judge whether the distance between the glue application positioning point and the glue application position is within 50 mm. If so, judge whether the second main drive stops driving; If the second main drive stops driving, control the second main drive to run at a speed of 50 mm / s after restart until it reaches the glue application position; If the second main drive does not stop driving, control the second main drive to run at the second main drive speed.

8. A cutting and winding speed control device, characterized in that, Include: The winding time calculation module is used to calculate the total winding time of a single cell according to the winding time and winding auxiliary time of a single cell; The main drive speed calculation module is used to determine the first main drive speed for laser cutting and the second main drive speed for glue application according to the total winding time of a single cell; The control module is used to control the first main drive to run at the first main drive speed and the second main drive to run at the second main drive speed; The main drive speed calculation module is specifically used for: Calculate the theoretical speed of laser cutting according to the total winding time of a single cell; Calculate the first main drive speed of laser cutting according to the theoretical speed of laser cutting; Calculate the glue application running time according to the total winding time of a single cell; Calculate the second main drive theoretical speed according to the glue application running time; Calculate the second main drive speed according to the second main drive theoretical speed; The calculation formula for the theoretical speed of laser cutting is: Where, V1 is the theoretical speed of laser cutting, L is the length of a single pole piece, and T is the total winding time of a single pole piece; The calculation formula for the first main drive speed of laser cutting is: V2 = V1 × K1 Where, V2 is the first main drive speed of laser cutting, and K1 is the first speed adaptation coefficient; The calculation formula for the second main drive speed is: V6 = V5 × K2 Where, V6 is the second main drive speed, V5 is the second main drive theoretical speed, and K2 is the second speed adaptation coefficient; The calculation formula for the first speed adaptation coefficient is: K1 = 1 - (PrePos1 - Modpos1) × 0.03 Where, PrePos1 is the current position of the unwind buffer floating roller, Mpdpos1 is the middle position of the unwind buffer floating roller, and 0.03 is the proportional constant; The calculation formula for the second speed adaptation coefficient is: K2 = 1 - (PrePos2 - Modpos2) × 0.0003 Where, PrePos2 is the current position of the second buffer floating roller, Modpos2 is the middle position of the second buffer floating roller, and 0.0003 is the proportional constant.

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