Laser focusing method for pole piece slitting equipment and pole piece slitting equipment

Abstract

The present application belongs to the technical field of lithium battery production, and specifically provides a focusing method for a pole piece slitting device and the pole piece slitting device. The present application aims to solve the problem of existing laser focusing methods which consume manpower, are complicated to operate and take a long time. To this end, the laser focusing method of the present application comprises S4: adjusting the distance c of the laser cutting device to the pole piece, and starting the laser cutting device to cut a preset feature on the pole piece once every interval set movement distance e, wherein c∈[L min , L max ], making the pole piece run at a preset length l during each adjustment of the distance c of the laser cutting device to the pole piece or before the laser cutting device cuts the preset feature; S5: determining the farthest cutting distance c max and the nearest cutting distance c min according to all the preset features cut; S6: determining the optimal cutting distance c max based on c min and c 焦 . The focusing method of the present application can realize automatic focusing and is fast and convenient.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery production technology, specifically providing a focusing method for electrode slitting equipment and an electrode slitting equipment. Background Technology

[0002] The lasers used for laser slitting of electrode sheets are generally Class IV lasers, which are invisible to the human eye. In addition, in order to pursue the quality of lithium battery electrode sheets (e.g., small heat-affected zone, small burrs), the lenses used for laser slitting are generally low depth-of-field fixed-focus field lenses. It is difficult to determine the optimal cutting distance by the size of the auxiliary light spot of such lenses (even if the lens moves away from or towards the object to be cut and exceeds the optimal cutting range, the human eye still cannot effectively distinguish the change in the size of the auxiliary light spot).

[0003] Currently, existing laser slitting and debugging methods still determine the optimal cutting distance based on the cutting effect. First, a distance clearly outside the optimal cutting position is determined, a feature cut is made, then the distance is moved closer to the optimal position, another feature cut is made, and the cutting effect is observed, until a position where a qualified electrode sheet can be removed is found to determine the optimal cutting position. Throughout this process, continuous cooperation between quality control personnel and equipment operators is required, and it relies heavily on experience, consuming significant time and manpower, making focusing operations cumbersome and time-consuming.

[0004] Accordingly, a new technical solution is needed in this field to solve the above-mentioned technical problems. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problems that existing laser focusing methods are labor-intensive, cumbersome and time-consuming.

[0006] In a first aspect, the present invention provides a laser focusing method for an electrode slitting device, the electrode slitting device comprising a laser cutting device, a sensor, an electrode, and a moving device, the laser cutting device being mounted on the moving device, the laser cutting device being positioned toward the electrode and capable of emitting a laser to cut the electrode, the moving device being configured to move the laser cutting device toward and away from the electrode to adjust the distance between the laser cutting device and the electrode, and the sensor being used to detect the distance between the laser cutting device and the electrode; the laser focusing method comprising the following steps: S1: obtaining a laser working distance a, a laser cutting floating distance b, and a sensor detection error d; S2: determining a maximum test distance L for focusing based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d. max and minimum test distance L minS3: The sensor detects the distance c between the laser cutting device and the electrode in real time; S4: The distance c between the laser cutting device and the electrode is adjusted, and the laser cutting device is activated once every set moving distance e, so that the laser cutting device emits laser light and cuts a preset feature on the electrode, where c∈[L min L max During each adjustment of the distance c between the laser cutting device and the electrode, or before the laser cutting device cuts the preset feature, the electrode is moved by a preset length l so that the distance between two adjacent preset features being cut is l; S5: Determine the farthest cutting distance c based on all the preset features being cut. max and the nearest cutting distance c min ;

[0007] S6: Based on c max and c min Determine the optimal cutting distance c 焦 S7: The moving device drives the laser cutting device to move until the distance c between the laser cutting device and the electrode is equal to the optimal cutting distance c. 焦 .

[0008] In the preferred embodiment of the laser focusing method for the electrode cutting equipment described above, step S4 specifically includes the following steps: S41: The moving device drives the laser cutting device to move, and the distance c between the laser cutting device and the electrode is adjusted to c = c1 = L. max ;

[0009] S42: Activate the laser cutting device, causing it to emit a laser and cut a preset feature on the electrode; S43: Move the electrode a preset length l; S44: Move the laser cutting device again using the moving device, moving it a set distance e toward the electrode, so that the distance c between the laser cutting device and the electrode is c = c n =L max -(n-1)×e, where n is the number of times the laser cutting device is adjusted; S45: Restart the laser cutting device to emit a laser and cut a preset feature on the electrode; S46: Repeat steps S43, S44 and S45 until L max -(n-1)×e≤L min Then proceed to step S5.

[0010] In the preferred technical solution of the laser focusing method for the electrode slitting equipment described above, step S5 specifically includes the following steps: S51: Identify all the preset features to be cut;

[0011] S52: Determine the preset feature that first cuts through the electrode sheet, and based on the preset feature that first cuts through the electrode sheet, determine the farthest cutting distance c. max S53: Determine the preset feature of the last electrode that cuts through the electrode, and determine the nearest cutting distance c based on the preset feature of the last electrode that cuts through the electrode. min .

[0012] In the preferred embodiment of the laser focusing method for the electrode cutting equipment described above, step S4 specifically includes the following steps: S41: The moving device drives the laser cutting device to move, and the distance c between the laser cutting device and the electrode is adjusted to c = c1 = L. min ;

[0013] S42: Activate the laser cutting device, causing it to emit a laser and cut a preset feature on the electrode; S43: Move the electrode along a preset length l; S44: Move the laser cutting device again using the moving device, moving it a set distance e away from the electrode, so that the distance c between the laser cutting device and the electrode is c = c n =L min +(n-1)×e, where n is the number of times the laser cutting device is adjusted; S45: Restart the laser cutting device to make it emit laser light and cut a preset feature on the electrode; S46: Repeat steps S43, S44 and S45 until L min +(n-1)×e≥L max Then proceed to step S5.

[0014] In the preferred technical solution of the laser focusing method for the electrode slitting equipment described above, step S5 specifically includes the following steps: S51: Identify all the preset features to be cut;

[0015] S52: Determine the preset feature that first cuts through the electrode sheet, and based on the preset feature that first cuts through the electrode sheet, determine the nearest cutting distance c. min S53: Determine the preset feature of the last electrode that cuts through the electrode, and based on the preset feature of the last electrode that cuts through the electrode, determine the farthest cutting distance c. max .

[0016] In the preferred embodiment of the laser focusing method for the electrode slitting equipment described above, in step S2, L max = a + b + d, L min =abd; and / or, in step S6, c 焦 =(c max +cmin )÷2.

[0017] In the preferred embodiment of the laser focusing method for the electrode slitting equipment described above, the number of laser cutting devices is multiple, each laser cutting device is mounted on a moving device, and the multiple laser cutting devices are distributed at equal intervals along a first direction. The sensor includes a first sensor and a second sensor. The first sensor is disposed on one of the laser cutting devices located at one end, and the second sensor is disposed on the other laser cutting device. The first sensor and the second sensor respectively detect the distance from their corresponding laser cutting device to the electrode. The laser focusing method includes the following steps: S1: The first sensor detects the first initial distance c from its corresponding first laser cutting device to the electrode. 1初始 S2: The second sensor detects the nth initial distance c between the nth laser cutting device and the electrode. n初始 S3: Based on the first initial distance c 1初始 and the initial distance c of the nth digit n初始 S4: Determine the arithmetic progression rate k of the distance; S5: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d; S6: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L of the focusing test. max and minimum test distance L min S6: The first sensor detects in real time the distance c1 from its corresponding first laser cutting device to the electrode; S7: The distance c1 from the first laser cutting device to the electrode is adjusted, and the first laser cutting device is activated once every set moving distance e, so that the first laser cutting device emits laser and cuts a preset feature on the electrode, wherein c1∈[L min L max During each adjustment of the distance c1 between the first laser cutting device and the electrode, or before the first laser cutting device cuts the preset feature, the electrode travels a preset length l so that the distance between two adjacent preset features cut is l; S8: Determine the farthest cutting distance c based on all the preset features cut. max1 and the nearest cutting distance c min1 S9: Based on C max1 and c min1 Determine the optimal cutting distance c corresponding to the laser cutting device. 焦1 S10: Based on c 1初始 and c 焦1S11: Determine the moving distance Z1 of the moving device corresponding to the first laser cutting device; S12: Based on Z1 and the arithmetic rate of change of distance k, determine the moving distance Z of the moving device corresponding to the m-th laser cutting device. m S12: Move each of the moving devices according to its corresponding moving distance to adjust the distance c from each laser cutting device to the electrode to its corresponding optimal cutting distance.

[0018] In the preferred embodiment of the laser focusing method for the electrode slitting equipment described above, in step S3,

[0019] In the preferred embodiment of the laser focusing method for the electrode slitting equipment described above, in step S10, Z1 = c 1初始 -c 焦1 In step S11, Z m = Z1 + (m-1) × k, where m is the m-th laser cutting device counting from the first laser cutting device; when Z m When Z is negative, the moving direction of the moving device is away from the electrode. m When the value is positive, the moving direction of the moving device is toward the electrode.

[0020] In a second aspect, the present invention provides an electrode slitting apparatus, the electrode slitting apparatus including a processor configured to perform the laser focusing method described above.

[0021] When the above technical solution is adopted, the laser focusing method of the present invention controls the operation of the moving device through the processor to adjust the distance between the laser cutting device and the electrode, thereby realizing automatic distance adjustment, cutting and recording. It also identifies the preset features after cutting and determines the preset features with good cutting effect. Based on the position of the corresponding preset features and the corresponding distance between the laser cutting device and the electrode, the optimal cutting distance is determined. When the image recognition module is used for recognition, automatic focusing can be achieved without manual intervention. When manual recognition is used, multiple people are not required to intervene, and one person can complete the recognition operation. The focusing efficiency is high and the accuracy is higher.

[0022] Specifically, the laser focusing method of the present invention continuously changes the distance between the laser cutting device and the electrode between the maximum and minimum test distances, and cuts a preset feature at each position. The farthest cutting distance and the closest cutting distance are determined by multiple preset features, and the optimal cutting distance is determined based on the farthest cutting distance and the closest cutting distance, thereby determining the position (i.e., focal length) of the laser cutting device relative to the electrode. Before actual cutting, the laser cutting device is moved to the position where the distance between it and the electrode is the optimal cutting distance. In addition, the distance c between the laser cutting device and the electrode is detected in real time by a sensor. The real-time detection of distance by the sensor can ensure that the position of the laser cutting device can be accurately adjusted each time. Attached Figure Description

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0024] Figure 1 This is a flowchart of the main laser focusing method of the present invention;

[0025] Figure 2 This is a flowchart of a first embodiment of the laser focusing method of the present invention;

[0026] Figure 3 This is a flowchart of a second embodiment of the laser focusing method of the present invention;

[0027] Figure 4 This is a flowchart of Embodiment 4 of the laser focusing method of the present invention. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] It should be noted that in the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through other components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Specifically, the electrode slitting apparatus of the present invention includes a laser cutting device, a sensor, an electrode, a moving device, and a processor. The laser cutting device, the sensor, and the moving device are all communicatively connected to the processor, which is configured to execute the laser focusing method of the present invention.

[0032] The laser cutting device is mounted on a moving device and is positioned facing the electrode. The laser cutting device can emit a laser to cut the electrode. The moving device is configured to move the laser cutting device toward and away from the electrode to adjust the distance between the laser cutting device and the electrode. A sensor is used to detect the distance between the laser cutting device and the electrode.

[0033] It should be noted that the present invention does not impose any restrictions on the specific structure of the laser cutting device. As long as the laser cutting device can emit laser and cut the electrode sheet, it is acceptable. In practical applications, those skilled in the art can set the structure of the laser cutting device according to actual needs.

[0034] It should also be noted that this invention does not impose any limitation on the number of laser cutting devices. In practical applications, those skilled in the art can set the number of laser cutting devices according to actual needs (e.g., the slitting requirements of electrode sheets). For example, with one laser cutting device, a wide electrode sheet can be slit into two narrow electrode sheets. For example, with five laser cutting devices arranged sequentially along the width direction of the electrode sheet, a wide electrode sheet can be simultaneously slit into six narrow electrode sheets. Any adjustments or changes to the number of laser cutting devices that do not depart from the basic principles of this invention should be considered within the scope of protection of this invention.

[0035] It should also be noted that this invention does not impose any limitations on the specific structure of the moving device. As long as the moving device can drive the laser cutting device to move towards or away from the electrode, thereby adjusting the distance between the laser cutting device and the electrode, it is acceptable. In practical applications, those skilled in the art can customize the specific structure of the moving device according to actual needs. For example, the moving device is a linear motor. For example, the moving device is a sliding module. Such adjustments and changes to the specific structure of the moving device do not depart from the basic principles of this invention and should be limited to the scope of protection of this invention.

[0036] It should also be noted that this invention does not impose any restrictions on the specific type of sensor, as long as the sensor can accurately detect the distance from the laser cutting device to the electrode. In practical applications, those skilled in the art can set the sensor type according to actual needs. For example, the sensor can be an ultrasonic sensor, or a laser sensor, or an infrared sensor, or a millimeter-wave radar sensor, etc. Such adjustments and changes to the sensor type do not deviate from the basic principles of this invention and should all be limited to the scope of protection of this invention.

[0037] Specifically, please refer to Figure 1 The laser focusing method for electrode slitting equipment of the present invention specifically includes the following steps:

[0038] S1: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d.

[0039] The laser working distance 'a' and the laser cutting floating distance 'b' are known data when the laser cutting device leaves the factory. In actual applications, this data is stored in the processor and can be read directly. Its value corresponds to the model of the laser cutting device and remains fixed.

[0040] The sensor detection error d is data known when the sensor leaves the factory. In practical applications, this data is stored in the processor and can be read directly. Its value corresponds to the sensor model and remains fixed.

[0041] S2: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L for the focusing test. max and minimum test distance L min Among them, L max = a + b + d, L min =abd.

[0042] Although the maximum test distance L is made max Equal to a+b+d and minimizes the trial distance L min =abd, but this should not limit the scope of the invention. In practical applications, other factors can be added to calculate L according to the actual situation. max and L min For example, to make the maximum test distance L max = a + b + d + x, L min =abdx. This specific method of calculating the maximum and minimum test distances should not limit the scope of protection of this invention.

[0043] S3: The sensor detects the distance c between the laser cutting device and the electrode in real time.

[0044] The sensor detects the distance c between the laser cutting device and the electrode in real time, so that the processor controls the moving device to move the laser cutting device and adjusts the position of the laser cutting device at any time, so that the distance between the laser cutting device and the electrode is equal to the required preset distance. This facilitates the automatic adjustment of the position of the laser cutting device and ensures the accuracy of the adjustment.

[0045] Preferably, the sensor is a distance sensor.

[0046] S4: Adjust the distance c between the laser cutting device and the electrode, and activate the laser cutting device once every set interval of a moving distance e, so that the laser cutting device emits laser light and cuts a preset feature on the electrode, where c∈[L min L max During each adjustment of the distance c between the laser cutting device and the electrode, or before the laser cutting device cuts the preset feature, the electrode is made to travel a preset length l so that the distance between two adjacent preset features being cut is l.

[0047] Multiple cutting tests are conducted between the maximum and minimum test distances, with each cutting test differing by a distance of e, thereby cutting out multiple preset features so that the optimal cutting distance can be determined based on these multiple preset features.

[0048] It should be noted that the value of the moving distance 'e' should be set according to the actual situation. Generally, the number of cuts is set to 8-10 to avoid errors caused by inaccurate cut counts. Therefore, e = (L max -L min )÷N, where N is the preset number of cuts.

[0049] It should also be noted that the present invention does not impose any restrictions on the specific execution steps of step S4, as long as the preset feature is cut once every set moving distance e. In practical applications, those skilled in the art can set the specific execution steps of step S4 according to actual needs. For example, in step S4, the cutting is performed sequentially from the farthest test distance to the nearest test distance. For example, in step S4, the cutting is performed sequentially from the nearest test distance to the farthest test distance. Such adjustments and changes to the specific execution steps of step S4 do not deviate from the basic principles of the present invention and should be limited to the protection scope of the present invention.

[0050] Preferably, the preset feature is a round hole. Setting the preset feature to a round hole makes it easier to identify and judge compared to setting the preset feature to a straight line; it also makes it easier to control the cutting compared to setting the preset feature to a square hole or other shapes.

[0051] It should also be noted that the present invention does not make any specific provisions regarding the length l of the preset length of the electrode strip. In practical applications, when the preset feature is a circular hole, l is only required to be no less than twice the diameter of the circular hole, so that two adjacent preset features can be separated for easy identification and observation.

[0052] S5: Determine the farthest cutting distance c based on all preset features of the cutting process. max and the nearest cutting distance c min .

[0053] For example, step S5 is performed by an image recognition module, which identifies preset features and determines the farthest cutting distance c based on the recognition result. max and the nearest cutting distance c min .

[0054] For example, step S5 is performed manually. The manual identifies preset features to determine the preset features corresponding to the farthest cutting distance and the nearest cutting distance, and inputs these preset features into the processor. The processor then determines the farthest cutting distance c. max and the nearest cutting distance c min .

[0055] It should be noted that the present invention does not impose any limitations on the specific execution steps of step S5. In practical applications, those skilled in the art can set the specific execution steps of step S5 according to actual needs. The above exemplary embodiments should not constitute a limitation on the scope of protection of the present invention.

[0056] S6: Based on c max and c min Determine the optimal cutting distance c 焦 Among them, c 焦 =(c max +c min )÷2.

[0057] It should be noted that the optimal cutting distance is the optimal distance between the laser cutting device and the electrode. At this distance, the laser cutting device can completely cut through the electrode, thus ensuring the slitting effect.

[0058] S7: Move the moving device to drive the laser cutting device until the distance c between the laser cutting device and the electrode is equal to the optimal cutting distance c. 焦 .

[0059] After determining the optimal cutting distance, the laser cutting device is moved so that the distance c between the laser cutting device and the electrode is equal to the optimal cutting distance c. 焦 This is to ensure the cutting effect in the later stages.

[0060] The laser focusing method of the present invention continuously changes the distance between the laser cutting device and the electrode between the maximum and minimum test distances, and cuts a preset feature at each position. The farthest cutting distance and the closest cutting distance are determined by multiple preset features, and the optimal cutting distance is determined based on the farthest cutting distance and the closest cutting distance, thereby determining the position (i.e., focal length) of the laser cutting device relative to the electrode. Before actual cutting, the laser cutting device is moved to the position where the distance between it and the electrode is the optimal cutting distance. In addition, the distance c between the laser cutting device and the electrode is detected in real time by a sensor. The real-time detection of the distance by the sensor can ensure that the position of the laser cutting device can be accurately adjusted each time.

[0061] The laser focusing method of the present invention uses a processor to control the operation of a moving device to adjust the distance between the laser cutting device and the electrode, thereby achieving automatic distance adjustment, cutting, and recording. It also identifies preset features after cutting and determines preset features with good cutting effect. Based on the position of the corresponding preset features and the corresponding distance between the laser cutting device and the electrode, the optimal cutting distance is determined. When the image recognition module is used for recognition, automatic focusing can be achieved without manual intervention. When manual recognition is used, multiple people are not required to complete the recognition operation; one person can complete the recognition operation. The focusing efficiency is high, and the accuracy is even higher.

[0062] The laser focusing method of the present invention will be described in detail below through several specific embodiments.

[0063] Example 1

[0064] Please see Figure 2 The laser focusing method in this embodiment specifically includes the following steps:

[0065] S1: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d.

[0066] S2: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L for the focusing test. max and minimum test distance L min , where L max = a + b + d, L min =abd.

[0067] S3: The sensor detects the distance c between the laser cutting device and the electrode in real time.

[0068] S41: Move the laser cutting device using the moving device, and adjust the distance c between the laser cutting device and the electrode to c = c1 = L. max .

[0069] S42: Start the laser cutting device, causing it to emit a laser and cut a preset feature on the electrode.

[0070] S43: Set the electrode travel length l to the preset length.

[0071] S44: Move the moving device again to move the laser cutting device, moving it a set distance e toward the electrode, so that the distance c between the laser cutting device and the electrode is equal to c. n =L max -(n-1)×e, where n is the number of times the laser cutting device is adjusted.

[0072] S45: Restart the laser cutting device to make it emit a laser and cut a preset feature on the electrode.

[0073] S46: Repeat steps S43, S44, and S45 until L max -(n-1)×e≤L min Then proceed to step S5.

[0074] Determine the current c n Is it less than or equal to L? min That is, L max Is -(n-1)×e less than or equal to L? min If the judgment result is "yes", then proceed to step S51; if the judgment result is "no", then return to step S43 and repeat steps S43 to S45.

[0075] S5: Determine the farthest cutting distance c based on all preset features of the cutting process. max and the nearest cutting distance c min .

[0076] Specifically, step S5 includes the following steps:

[0077] S51: Identify all preset features of the cut.

[0078] The identification process can be performed by an image recognition module. After identification, the image recognition module feeds the image back to the processor, which processes and analyzes the image to determine the preset characteristics of the cut electrode sheet.

[0079] S52: Determine the preset features of the first through-cut electrode sheet, and based on the preset features of the first through-cut electrode sheet, determine the farthest cutting distance c. max .

[0080] After determining the preset feature for the first cut through the electrode sheet, the position of this preset feature is located. Based on the data recorded during the cutting process, the distance from the laser cutting device to the electrode sheet corresponding to this preset feature is determined, which is the farthest cutting distance c.max .

[0081] S53: Determine the preset features of the last cut electrode sheet, and based on the preset features of the last cut electrode sheet, determine the nearest cutting distance c. min .

[0082] After determining the preset feature that will be cut through the last electrode sheet, the position of this preset feature is located. Based on the data recorded during the cutting process, the distance from the laser cutting device to the electrode sheet corresponding to this preset feature is determined, which is the closest cutting distance c. min .

[0083] S6: Based on c max and c min Determine the optimal cutting distance c 焦 Among them, c 焦 =(c max +c min )÷2.

[0084] S7: Move the moving device to drive the laser cutting device until the distance c between the laser cutting device and the electrode is equal to the optimal cutting distance c. 焦 .

[0085] Example 2

[0086] Please see Figure 3 The laser focusing method in this embodiment specifically includes the following steps:

[0087] S1: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d.

[0088] S2: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L for the focusing test. max and minimum test distance L min , where L max = a + b + d, L min =abd.

[0089] S3: The sensor detects the distance c between the laser cutting device and the electrode in real time.

[0090] S41: Move the laser cutting device using the moving device, and adjust the distance c between the laser cutting device and the electrode to c = c1 = L. min .

[0091] S42: Start the laser cutting device, causing it to emit a laser and cut a preset feature on the electrode.

[0092] S43: Set the electrode travel length l to the preset length.

[0093] S44: The moving device again drives the laser cutting device to move a set distance e away from the electrode, so that the distance c between the laser cutting device and the electrode is equal to c. n =L min +(n-1)×e, where n is the number of times the laser cutting device is adjusted.

[0094] S45: Restart the laser cutting device to make it emit a laser and cut a preset feature on the electrode.

[0095] S46: Repeat steps S43, S44, and S45 until L min +(n-1)×e≥L max Then proceed to step S5.

[0096] Determine the current c n Is it greater than or equal to L? max That is, L min Is +(n-1)×e greater than or equal to L? max If the judgment result is "yes", then proceed to step S51; if the judgment result is "no", then return to step S43 and repeat steps S43 to S45.

[0097] S5: Determine the farthest cutting distance c based on all preset features of the cutting process. max and the nearest cutting distance c min .

[0098] Specifically, step S5 includes the following steps:

[0099] S51: Identify all preset features of the cut.

[0100] The identification process can be performed by an image recognition module. After identification, the image recognition module feeds the image back to the processor, which processes and analyzes the image to determine the preset characteristics of the cut electrode sheet.

[0101] S52: Determine the preset features of the first through-cut electrode sheet, and based on the preset features of the first through-cut electrode sheet, determine the nearest cutting distance c. min .

[0102] After determining the preset feature for the first cut through the electrode sheet, the position of this preset feature is located. Based on the data recorded during the cutting process, the distance from the laser cutting device to the electrode sheet corresponding to this preset feature is determined, which is the closest cutting distance c. min .

[0103] S53: Determine the preset features of the last cut electrode sheet, and based on the preset features of the last cut electrode sheet, determine the farthest cutting distance c. max.

[0104] After determining the preset feature that will be cut through the last electrode sheet, the position of this preset feature is located. Based on the data recorded during the cutting process, the distance from the laser cutting device to the electrode sheet corresponding to this preset feature is determined, which is the farthest cutting distance c. max .

[0105] S6: Based on c max and c min Determine the optimal cutting distance c 焦 Among them, c 焦 =(c max +c min )÷2.

[0106] S7: Move the moving device to drive the laser cutting device until the distance c between the laser cutting device and the electrode is equal to the optimal cutting distance c. 焦 .

[0107] Example 3

[0108] There are multiple laser cutting devices, each mounted on a mobile device. The multiple laser cutting devices are distributed at equal intervals along a first direction. Each laser cutting device is equipped with a corresponding sensor, which is configured to detect the distance from its corresponding laser cutting device to the electrode.

[0109] When there are multiple laser cutting devices, each laser cutting device is equipped with a corresponding sensor. Before use, each laser cutting device is laser focused. Each laser cutting device can perform the focusing operation in accordance with the specific method of Embodiment 1 or Embodiment 2.

[0110] Example 4

[0111] There are multiple laser cutting devices, each mounted on a mobile device. The multiple laser cutting devices are distributed at equal intervals along a first direction, and the projections of the multiple laser cutting devices in the first direction overlap. The sensor includes a first sensor and a second sensor. The first sensor is disposed on one of the laser cutting devices located at one end, and the second sensor is disposed on another laser cutting device. The first sensor and the second sensor respectively detect the distance from their corresponding laser cutting device to the electrode.

[0112] Please see Figure 4 The laser focusing method in this embodiment includes the following steps:

[0113] S1: The first sensor detects the initial distance c between its corresponding first laser cutting device and the electrode. 1初始 .

[0114] S2: The second sensor detects the nth initial distance c from the corresponding nth laser cutting device to the electrode. n初始 .

[0115] S3: Based on the first initial distance c 1初始 and the initial distance c of the nth digit n初始 Determine the arithmetic progression rate k of the distance. Wherein,

[0116] S4: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d.

[0117] S5: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L for the focusing test. max and minimum test distance L min .

[0118] S6: The first sensor detects the distance c1 from the first laser cutting device to the electrode in real time.

[0119] S7: Adjust the distance c1 between the first laser cutting device and the electrode, and start the first laser cutting device once every set moving distance e, so that the first laser cutting device emits laser and cuts a preset feature on the electrode, where c1∈[L min L max During each adjustment of the distance c1 between the first laser cutting device and the electrode, or before the first laser cutting device cuts the preset feature, the electrode is made to travel a preset length l so that the distance between two adjacent preset features being cut is l.

[0120] Specifically, step S7 in this embodiment can refer to steps S41 to S46 in embodiments 1 and 2.

[0121] S8: Determine the farthest cutting distance c based on all preset features of the cutting process. max1 and the nearest cutting distance c min1 .

[0122] Specifically, step S8 in this embodiment can refer to steps S51 to S53 in embodiments 1 and 2.

[0123] S9: Based on c max1 and c min1 Determine the optimal cutting distance c corresponding to the laser cutting device. 焦1 .

[0124] S10: Based on c 1初始 and c 焦1Determine the moving distance Z1 of the moving device corresponding to the first laser cutting device. Where Z1 = c 1初始 -c 焦1 .

[0125] S11: Based on Z1 and the arithmetic rate of change of distance k, determine the moving distance Zm of the moving device corresponding to the m-th laser cutting device. m = Z1 + (m-1) × k, where m is the m-th laser cutting device counting from the first laser cutting device; when Z m When Z is negative, the moving direction of the moving device is away from the electrode. m When the value is positive, the moving direction of the moving device is towards the electrode.

[0126] S12: Move each moving device according to its corresponding moving distance to adjust the distance c from each laser cutting device to the electrode to its corresponding optimal cutting distance.

[0127] Since the projections of multiple laser cutting devices in the first direction are consistent, if the width direction of the electrode coincides with the first direction (i.e., there is no angle), the distance from each laser cutting device to the electrode is consistent, and the calculated k is 0, meaning there is no arithmetic progression rate of distance. However, if the width direction of the electrode does not coincide with the first direction (i.e., there is an angle), the distance from each laser cutting device to the electrode is inconsistent. Since the tilt angle of the electrode is the same, in the initial state, the distances from any two laser cutting devices to the electrode satisfy a linear relationship. Therefore, the slope k of this linear relationship can be calculated through the steps S1 to S3 above. Because the laser cutting devices are of the same model, it is only necessary to determine the optimal cutting distance of one laser cutting device (generally, the laser cutting device located at the end is selected), calculate the amount of movement required for that laser cutting device, and then determine the amount of movement required for the other laser cutting devices based on the linear relationship. The overall operation is simple; only one laser cutting device needs to be laser focused to determine the optimal cutting position of all laser cutting devices, and the laser focusing speed is faster.

[0128] Therefore, the laser focusing method in this embodiment avoids individual focusing for each laser cutting device. Only the moving distance of one laser cutting device needs to be determined to calculate the moving distances of the others, enabling rapid focusing of multiple laser cutting devices. This method is faster and more convenient to use. Furthermore, it saves space for sensor installation, avoiding the need for multiple sensors and reducing the overall size of the electrode slitting equipment.

[0129] In addition, in practical applications, it is also possible to select to perform focusing operations on the laser cutting devices corresponding to the first and second sensors according to steps S4 to S10 respectively to obtain two Z values. Based on these two Z values, the distance arithmetic change rate k is recalculated. Then, it is determined whether the values ​​of the two distance arithmetic change rates k are equal to verify that the laser cutting device and sensor used are of the same model. If the values ​​of the two distance arithmetic change rates are not equal, it is necessary to check the multiple laser cutting devices or sensors used, or to perform laser focusing operations on each laser cutting device separately to improve the accuracy of the final focusing operation.

[0130] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A laser focusing method for an electrode slitting device, characterized in that, The electrode slitting equipment includes a laser cutting device, a sensor, an electrode, and a moving device. The laser cutting device is mounted on the moving device. The laser cutting device is positioned facing the electrode and is capable of emitting a laser to cut the electrode. The moving device is configured to move the laser cutting device toward and away from the electrode to adjust the distance between the laser cutting device and the electrode. The sensor is used to detect the distance between the laser cutting device and the electrode. The number of laser cutting devices is multiple, each laser cutting device is mounted on a mobile device, and the multiple laser cutting devices are distributed at equal intervals along a first direction. The sensor includes a first sensor and a second sensor. The first sensor is disposed on one of the laser cutting devices located at one end, and the second sensor is disposed on another laser cutting device. The first sensor and the second sensor respectively detect the distance from their corresponding laser cutting device to the electrode sheet. The laser focusing method includes the following steps: S1: The first sensor detects the first initial distance c between its corresponding first laser cutting device and the electrode. 1初始 ; S2: The second sensor detects the nth initial distance c between the nth laser cutting device and the electrode. n初始 ; S3: Based on the first initial distance c 1初始 and the initial distance c of the nth digit n初始 Determine the arithmetic progression rate k of the distance, where, ; S4: Obtain the laser working distance a, the laser cutting floating distance b, and the sensor detection error d; S5: Based on the laser working distance a, the laser cutting floating distance b, and the sensor detection error d, determine the maximum test distance L for the focusing test. max and minimum test distance L min ; S6: The first sensor detects in real time the distance c1 from its corresponding first laser cutting device to the electrode sheet; S7: Adjust the distance c1 between the first laser cutting device and the electrode, and activate the first laser cutting device once every set moving distance e, so that the first laser cutting device emits laser light and cuts a preset feature on the electrode, wherein c1∈[L min L max During each adjustment of the distance c1 between the first laser cutting device and the electrode, or before the first laser cutting device cuts the preset feature, the electrode is made to travel a preset length l so that the distance between two adjacent preset features cut is l. S8: Determine the farthest cutting distance c based on all the preset features of the cut. max1 and the nearest cutting distance c min1 ; S9: Based on c max1 and c min1 Determine the optimal cutting distance c corresponding to the laser cutting device. 焦1 ; S10: Based on c 1初始 and c 焦1 Determine the moving distance Z1 of the moving device corresponding to the first laser cutting device; S11: Based on Z1 and the arithmetic rate of change of distance k, determine the moving distance Z of the moving device corresponding to the m-th laser cutting device. m ; S12: Move each of the moving devices according to its corresponding moving distance to adjust the distance c from each laser cutting device to the electrode to its corresponding optimal cutting distance.

2. The laser focusing method for an electrode slitting device according to claim 1, characterized in that, Step S7 specifically includes the following steps: S71: The moving device drives the laser cutting device to move, adjusting the distance c between the laser cutting device and the electrode to c=c1=L. max ; S72: Activate the laser cutting device to emit a laser and cut a preset feature on the electrode sheet; S73: Set the electrode strip to a preset length l; S74: The moving device drives the laser cutting device to move again, moving the laser cutting device toward the electrode by a set distance e, so that the distance c from the laser cutting device to the electrode is equal to c. n =L max -(n-1)×e, where n is the number of adjustments made to the laser cutting device; S75: Restart the laser cutting device to make it emit a laser and cut a preset feature on the electrode sheet; S76: Repeat steps S73, S74, and S75 until L max -(n-1)×e≤L min Then proceed to step S5.

3. The laser focusing method for an electrode slitting device according to claim 2, characterized in that, Step S8 specifically includes the following steps: S81: Identify all the preset features of the cut; S82: Determine the preset feature that first cuts through the electrode sheet, and based on the preset feature that first cuts through the electrode sheet, determine the farthest cutting distance c. max ; S83: Determine the preset feature of the last electrode sheet that has been cut through, and determine the nearest cutting distance c based on the preset feature of the last electrode sheet that has been cut through. min .

4. The laser focusing method for an electrode slitting device according to claim 1, characterized in that, Step S7 specifically includes the following steps: S71: The moving device drives the laser cutting device to move, adjusting the distance c between the laser cutting device and the electrode to c=c1=L. min ; S72: Activate the laser cutting device to emit a laser and cut a preset feature on the electrode sheet; S73: Set the electrode strip to a preset length l; S74: The moving device drives the laser cutting device to move again, moving the laser cutting device away from the electrode by a set distance e, so that the distance c between the laser cutting device and the electrode is c=c n =L min + (n-1)×e, where n is the number of adjustments made by the laser cutting device; S75: Restart the laser cutting device to make it emit a laser and cut a preset feature on the electrode sheet; S76: Repeat steps S73, S74, and S75 until L min +(n-1)×e≥L max Then proceed to step S8.

5. The laser focusing method for an electrode slitting device according to claim 4, characterized in that, Step S8 specifically includes the following steps: S81: Identify all the preset features of the cut; S82: Determine the preset feature that first cuts through the electrode sheet, and based on the preset feature that first cuts through the electrode sheet, determine the nearest cutting distance c. min ; S83: Determine the preset feature of the last electrode sheet that is cut through, and determine the farthest cutting distance c based on the preset feature of the last electrode sheet that is cut through. max .

6. The laser focusing method for an electrode slitting device according to claim 1, characterized in that, In step S5, L max =a+b+d,L min =abd; And / or, in step S9, c 焦1 =(c max +c min )÷2.

7. The laser focusing method for an electrode slitting device according to claim 1, characterized in that, In step S10, Z1=c 1初始 -c 焦1 ; In step S11, Where m is the m-th laser cutting device counting from the first laser cutting device; when Z m When Z is negative, the moving direction of the moving device is away from the electrode. m When the value is positive, the moving direction of the moving device is toward the electrode.

8. An electrode slitting device, comprising a processor, characterized in that, The processor is configured to perform the laser focusing method according to any one of claims 1 to 7.

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