Laser heating processing method

Abstract

The invention discloses a laser heating processing method. The method comprises the steps that the positions of a plurality of programmable dodging machining heads are arranged side by side according to the machining technology requirement of a strip, so that laser machining areas of the programmable dodging machining heads are spliced to cover the position, needing to be machined, of the strip; laser parameters of each programmable dodging processing head are set according to the processing technology requirements of the strip; controlling the strip to move along the length direction, identifying a processing area on the strip, controlling the plurality of programmable dodging processing heads to perform laser processing on the processing area when the processing area moves to the processing positions of the plurality of programmable dodging processing heads, and controlling the plurality of programmable dodging processing heads to perform laser processing on the processing area when the processing area moves out of the processing positions of the plurality of programmable dodging processing heads. And the plurality of programmable dodging processing heads are controlled to stop laser processing. The invention has the advantages of high processing efficiency, high precision, high processing quality and low energy consumption, and can reduce waste and loss in the battery manufacturing process, thereby lowering the manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of laser processing, and in particular to a laser heating processing method. Background Art

[0002] In the traditional lithium-ion battery manufacturing process, the drying and modification of electrode materials are particularly critical. The processing process requires the use of a large amount of chemical solutions and high temperature and high pressure conditions, and the processing results are directly related to the performance and service life of the battery. Traditional electrode processing technologies, such as hot air convection drying, infrared drying and microwave drying, often have problems such as low drying efficiency, unstable product quality, large energy loss and complex processes. These technologies can achieve more precise manufacturing through laser processing, thereby reducing the use of chemical solutions and energy consumption in the manufacturing process, and can also improve the energy density and cycle life of the battery. Summary of the invention

[0003] The purpose of the present invention is to provide a laser heating processing method in view of the deficiencies in the prior art.

[0004] To achieve the above object, the present invention provides a laser heating processing method, comprising: According to the processing requirements of the strip material, the positions of several programmable light homogenization processing heads are arranged in parallel, so that the laser processing areas of the several programmable light homogenization processing heads can be spliced ​​to cover the processing positions required by the strip material; According to the processing requirements of the strip material, the laser parameters of each programmable light homogenization processing head are set so that the temperature zones of several programmable light homogenization processing heads match the processing requirements of the strip material; The material strip is controlled to move along the length direction, a processing area on the material strip is identified during the movement of the material strip, and when the processing area moves to a processing position of a plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to perform laser processing on the processing area, and when the processing area moves out of the processing position of the plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to stop laser processing.

[0005] Furthermore, the processing areas are arranged in a plurality on the material strip at intervals, and are identified by a position sensor arranged on the front side of the programmable light homogenization processing head, and the position sensor is arranged facing the material strip.

[0006] Furthermore, the position sensor is a photoelectric sensor or a color mark sensor.

[0007] Furthermore, the strip is driven to move by a roll-to-roll reeling mechanism, the roll-to-roll reeling mechanism includes a plurality of reeling rollers connected to the strip in a rolling manner, the reeling rollers rotate synchronously when the strip moves, an encoder is installed at one end of the reeling roller, and the position sensor detection and the encoder are arranged on a plane perpendicular to the moving direction of the strip; When the position sensor detects the starting point of the processing area, it records the value of the current encoder. When the value change of the encoder reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the material strip direction, it is determined that the processing area has moved to the processing position of the programmable light homogenization processing head. When the position sensor detects the end point of the processing area, it records the current encoder value. When the encoder value change reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the material belt direction, it is judged that the processing area has moved out of the processing position of several programmable light homogenization processing heads.

[0008] Furthermore, when the encoder detects that the speed of the material belt movement is 0, it controls a plurality of programmable light homogenization processing heads to stop laser processing; when it detects that the speed of the material belt movement is not 0, it resumes laser processing.

[0009] Furthermore, it also includes: During the movement of the material strip, the position offset of the material strip in the vertical direction of the movement is collected, and the processing position of each programmable light homogenization processing head is dynamically adjusted according to the position offset, so that the laser processing position is consistent with the processing area.

[0010] Furthermore, the position deviation of the strip in the vertical direction of movement is collected by a through-beam photoelectric sensor.

[0011] Furthermore, it also includes: When laser processing is performed, the temperature of the processing area currently being processed is collected, and the power of the laser and the light output point of the programmable uniform light processing head are adjusted in real time according to the temperature of the processing area currently being processed.

[0012] Furthermore, the temperature of the processing area is collected by an infrared temperature measuring instrument and a thermal imager.

[0013] Furthermore, there are multiple programmable light-homogenizing processing heads, which are respectively fixed on multiple movers of the multi-motor linear motor. The positions of the movers of the multi-motor linear motor are adjusted according to the processing requirements of the material and the processing range of each programmable light-homogenizing processing head.

[0014] Beneficial effects: The present invention uses multiple programmable uniform light processing heads to splice a laser processing trajectory in the vertical direction of the moving strip, and sets the laser parameters of each programmable uniform light processing head according to the strip processing process requirements to form different heating temperature zones, and the heating temperature zones match the processing requirements of the strip; when the strip moves at high speed, the processing area, the position fluctuation of the strip perpendicular to the movement direction and the moving speed of the strip are obtained through position sensors, correction sensors and encoders to realize online laser heating processing at the specified position of the strip; during the laser processing, the temperature of the processing area on the strip is monitored in real time through an infrared temperature measuring instrument and a thermal imager, and the power of the laser and the light emitting point of the programmable uniform light processing head are adjusted in real time according to temperature feedback to ensure that the required processing area of ​​the strip is heated evenly in the length direction; the present invention adopts laser processing to achieve more precise heating manufacturing, with high processing efficiency, high precision, high processing quality and low energy consumption, which can reduce waste and loss in the battery manufacturing process, thereby reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of the laser heating processing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0017] like Figure 1 As shown, an embodiment of the present invention provides a laser heating processing method, comprising: According to the processing requirements of the strip material, the positions of several programmable light homogenization processing heads are arranged in parallel, so that the laser processing areas of several programmable light homogenization processing heads can be spliced ​​to cover the processing position required by the strip material. Specifically, the laser processing area of ​​each programmable light homogenization processing head is a line segment, and the laser processing areas of several programmable light homogenization processing heads can be spliced ​​into a longer line segment, the direction of which is set along the width direction of the strip material, thereby covering the processing position required by the strip material. The number of programmable light homogenization processing heads is preferably multiple, and the corresponding number can be set according to the width of the processing area on different strip materials, or it can be set to the number that meets the width of the maximum processing area. When processing a processing area with a smaller width, the corresponding number of programmable light homogenization processing heads can be controlled to work. Multiple programmable light homogenization processing heads are preferably fixed on multiple movers of a multi-motor linear motor respectively, and the mover position of the multi-motor linear motor is adjusted according to the processing requirements of the strip material and the laser processing area of ​​each programmable light homogenization processing head, so as to facilitate the adjustment of the laser processing areas of multiple programmable light homogenization processing heads to cover the processing position required by the strip material after splicing.

[0018] The laser parameters of each programmable light homogenization processing head are set according to the processing requirements of the strip material, including setting the temperature partitions of the programmable light homogenization processing head in the processing area, so that the temperature partitions of several programmable light homogenization processing heads match the processing requirements of the strip material. Specifically, by controlling each independent laser unit module in a single programmable light homogenization processing head to set the laser processing area of ​​the programmable light homogenization processing head, and setting the laser output power of each programmable light homogenization processing head, the same or different temperature partitions required by the processing technology of the strip material can be formed in the entire processing area.

[0019] The material strip is controlled to move along the length direction, a processing area on the material strip is identified during the movement of the material strip, and when the processing area moves to a processing position of a plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to perform laser processing on the processing area, and when the processing area moves out of the processing position of the plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to stop laser processing.

[0020] If the processing area on the strip is continuous, there is no need to mark the processing area on the strip. When the strip passes through the processing position of the programmable light-uniform processing head, the laser processing can be directly turned on. For the strip with multiple processing areas at intervals, that is, two adjacent processing areas are separated by a non-processing area, the above processing areas need to be marked in advance, and the position sensor is used to identify the processing area before entering the processing position of the programmable light-uniform processing head. The above position sensor needs to be set directly opposite the strip. Taking the production of lithium battery electrodes as an example, the processing area and the non-processing area on the strip are set to different materials, and the colors and reflectivity of the two materials are different, so they can be identified by the photoelectric sensor or color mark sensor set on the front side of the programmable light-uniform processing head.

[0021] The above-mentioned strip is preferably driven to move by a roll-to-roll rewinding and unwinding mechanism. The roll-to-roll rewinding and unwinding mechanism is a prior art, which includes a rewinding roller and a discharging roller that are spaced apart and rotate synchronously on both sides, and also includes a plurality of rewinding roller shafts that are connected to the strip in a rolling manner, and the rewinding roller shafts rotate synchronously when the strip moves. An encoder is installed at one end of the rewinding roller shaft. The above-mentioned encoder is preferably an incremental encoder, which converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and uses the number of pulses to represent the size of the displacement. It directly uses the principle of photoelectric conversion to output three groups of square wave pulses A, B and Z phases. The phase difference between the two groups of pulses A and B is 90 degrees, so that the rotation direction can be easily determined. The Z phase has one pulse per rotation, which is used to mark the starting position of each circle of the encoder.

[0022] The encoder is used in conjunction with the position sensor to determine whether the processing area on the strip enters and exits the processing position of several programmable light homogenization processing heads, providing a basis for turning the laser on and off. Specifically, when the position sensor detects the starting point of the processing area, it records the current encoder value. When the encoder value change reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the strip direction, it is determined that the processing area has moved to the processing position of several programmable light homogenization processing heads. After installation, the distance between the encoder and the programmable light homogenization processing head along the strip direction is fixed, and the strip moves from the encoder to the processing position of the programmable light homogenization processing head. The angle of rotation of the winding roller shaft on which the encoder is installed during the movement is also fixed, and the encoder value change during the period is also fixed. After setting the target change in the debugging stage, after the position sensor detects the starting point of the processing area, when the encoder value change reaches the set target change, the starting point of the processing area is just located at the processing position of the programmable light homogenization processing head. At this time, the laser is controlled to be emitted, and laser processing can be performed from the starting point of the processing area. Similarly, when the position sensor detects the end point of the processing area, it records the current encoder value. When the encoder value change reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the strip direction, it is judged that the processing area moves out of the processing position of several programmable light homogenization processing heads. In addition, when the length of the processing area on the strip is less than the distance between the encoder and the programmable light homogenization processing head along the strip direction, it is necessary to trigger the latching of the encoder values ​​corresponding to the start / end points of more than two processing areas according to the position sensor, and turn on / off the laser processing in sequence according to the encoder value change.

[0023] In addition, the encoder can also detect the speed of the material moving. When the speed of the material moving is detected to be 0, that is, the material is in a stationary state, several programmable uniform light processing heads are controlled to stop laser processing, thereby avoiding safety accidents caused by excessive local temperature due to laser processing when the material is stationary. When the speed of the material moving is detected to be not 0, the laser processing is resumed.

[0024] Since the strip may be released from a rolled state, and due to the material of the strip, it is difficult to ensure that the processing position is flat when passing through the programmable light-homogenizing processing head. In order to ensure the processing accuracy, during the movement of the strip, the position offset of the strip in the vertical direction of movement is collected, and the processing position of each programmable light-homogenizing processing head is dynamically adjusted according to the position offset, thereby changing the position of the laser in the vertical direction of the strip movement, so that the position of the laser processing fits the processing area, thereby ensuring the position accuracy of the laser processing. The position offset of the above-mentioned strip in the vertical direction of movement can be collected by a correction sensor, such as a through-beam photoelectric sensor. The through-beam photoelectric sensor is a sensor composed of a transmitter and a receiver. The transmitter emits a light beam and the receiver receives a light signal. The strip blocks part of the light beam emitted by the transmitter, and the change in light intensity received by the receiver can represent the area blocked by the strip, thereby obtaining the position offset of the strip in the vertical direction of movement. The working principle of the correction sensor is a common technology and will not be described here.

[0025] In order to realize the temperature monitoring of laser processing, during the laser processing, the temperature of the processing area currently being processed is collected, and the power of the laser and the light output point of the programmable uniform light processing head are adjusted in real time according to the temperature of the processing area currently being processed, so as to ensure that the required processing area of ​​the strip is heated evenly. The temperature of the above processing area can be collected by an infrared temperature measuring instrument and a thermal imager. The infrared temperature measuring instrument is a non-contact temperature measurement device, which is composed of an optical system, a photoelectric detector, a signal amplifier, and signal processing, display output and other parts, and can convert temperature changes into electrical signal output. Infrared temperature measuring instruments are common equipment and are not described here. Thermal imagers are a type of equipment that uses infrared thermal imaging technology to detect the infrared radiation of the target object, and perform signal processing, photoelectric conversion and other means to convert the image of the temperature distribution of the target object into a visible image and output it. Thermal imagers are common equipment and are not described here. The above infrared temperature measuring instrument collects the temperature of a certain point in the processing area after it is heated, and can feed back the temperature of the measuring point to the control device in real time; while the thermal imager can obtain the temperature image of the entire processing area after heating, and obtain the temperature change of the entire processing area by analyzing the temperature image information.

[0026] In addition, the above-mentioned position sensor, deviation correction sensor, infrared temperature measuring instrument and thermal imager all need corresponding supporting mechanisms to be fixed at corresponding positions, which will not be described in detail here.

[0027] The above is only a preferred embodiment of the present invention. It should be noted that for ordinary technicians in this technical field, other parts not specifically described belong to the prior art or common knowledge. Several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A laser heating processing method, characterized in that: include: According to the processing requirements of the strip material, the positions of several programmable light homogenization processing heads are arranged in parallel, so that the laser processing areas of the several programmable light homogenization processing heads can be spliced ​​to cover the processing positions required by the strip material; According to the processing requirements of the strip material, the laser parameters of each programmable light homogenization processing head are set so that the temperature zones of several programmable light homogenization processing heads match the processing requirements of the strip material; The material strip is controlled to move along the length direction, a processing area on the material strip is identified during the movement of the material strip, and when the processing area moves to a processing position of a plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to perform laser processing on the processing area, and when the processing area moves out of the processing position of the plurality of programmable light homogenizing processing heads, the plurality of programmable light homogenizing processing heads are controlled to stop laser processing.

2. A laser heating processing method according to claim 1, characterized in that: The processing areas are arranged in a plurality on the strip at intervals, and are identified by a position sensor arranged at the front side of a programmable light homogenization processing head, wherein the position sensor is arranged facing the strip.

3. A laser heating processing method according to claim 2, characterized in that: The position sensor is a photoelectric sensor or a color mark sensor.

4. The laser heating processing method according to claim 2, characterized in that: The strip is driven to move by a roll-to-roll reeling mechanism, which includes a plurality of reeling rollers connected to the strip in a rolling manner. The reeling rollers rotate synchronously when the strip moves, and an encoder is installed at one end of the reeling roller. The position sensor detection and the encoder are arranged on a plane perpendicular to the moving direction of the strip. When the position sensor detects the starting point of the processing area, it records the value of the current encoder. When the value change of the encoder reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the material strip direction, it is determined that the processing area has moved to the processing position of the programmable light homogenization processing head. When the position sensor detects the end point of the processing area, it records the current encoder value. When the encoder value change reaches the target change set according to the distance between the encoder and the programmable light homogenization processing head along the material belt direction, it is judged that the processing area has moved out of the processing position of several programmable light homogenization processing heads.

5. A laser heating processing method according to claim 4, characterized in that: When the encoder detects that the speed of the material belt movement is 0, it controls a plurality of programmable light homogenization processing heads to stop laser processing; when it detects that the speed of the material belt movement is not 0, it resumes laser processing.

6. The laser heating processing method according to claim 1, characterized in that: Also includes: During the movement of the material strip, the position offset of the material strip in the vertical direction of the movement is collected, and the processing position of each programmable light homogenization processing head is dynamically adjusted according to the position offset, so that the laser processing position is consistent with the processing area.

7. The laser heating processing method according to claim 6, characterized in that: The position deviation of the strip in the vertical direction of movement is collected by a through-beam photoelectric sensor.

8. The laser heating processing method according to claim 1, characterized in that: Also includes: When laser processing is performed, the temperature of the processing area currently being processed is collected, and the power of the laser and the light output point of the programmable uniform light processing head are adjusted in real time according to the temperature of the processing area currently being processed.

9. The laser heating processing method according to claim 8, characterized in that: The temperature of the processing area is collected by an infrared temperature measuring instrument and a thermal imager.

10. The laser heating processing method according to claim 1, characterized in that: There are multiple programmable light homogenization processing heads, which are respectively fixed on multiple movers of the multi-motor linear motor. The positions of the movers of the multi-motor linear motor are adjusted according to the processing requirements of the material and the processing range of each programmable light homogenization processing head.

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