CN221817636U - Laser scribing mechanism and pole piece production line - Google Patents

Abstract

The utility model provides a laser scribing mechanism and a pole piece production line, wherein the laser scribing mechanism comprises at least one group of laser spectrometers; each group of laser spectrometers comprises two laser spectrometers, and the two laser spectrometers are arranged relatively along the first direction of the workpiece to be processed; the laser spectrometer comprises a laser, a spectrometer component, and a scribing component, wherein the laser emits a first laser, and the spectrometer component is used to evenly divide the first laser into multiple second laser beams; the scribing component is used to move the second laser on the transmission axis of the second laser, and focus the second laser on the workpiece to be processed. The utility model solves the problem of low processing efficiency of the existing laser scribing mechanism.

Description

Laser scribing mechanism and pole piece production line

Technical Field

The utility model relates to the technical field of battery production equipment, in particular to a laser scribing mechanism and a pole piece production line.

Background Art

Lithium-ion batteries have the advantages of long cycle life, fast charging, high voltage, high specific energy and good safety performance, making them widely used in the fields of automobiles, energy storage, smart 3C products, etc. Under the current lithium-ion battery process, by scribing the surface coating of the pole piece, the absorption speed and storage capacity of the pole piece for the electrolyte can be improved, and the electrolyte can be distributed more evenly inside the lithium-ion battery, thereby improving the capacity of the lithium-ion battery and improving the capacity consistency and cycle performance of the lithium-ion battery.

Laser scribing is usually used in the existing technology, but wide-width pole pieces have high requirements for processing efficiency. In the process of intensive scribing, even expensive high-speed galvanometers are difficult to meet production needs. At this time, in order to meet the processing efficiency, the number of galvanometers needs to be increased. However, when the number of galvanometers is increased, the number of synchronous optical path systems will also increase, resulting in a significant increase in the overall size and cost of the laser system.

Utility Model Content

The utility model aims to solve the problem of low processing efficiency of the existing laser scribing mechanism.

In order to solve the above problems, the first aspect of the utility model provides a laser scribing mechanism, which is used to scribing a workpiece to be processed, and the laser scribing mechanism includes at least one group of laser spectrometers;

Each group of the laser spectrometers includes two laser spectrometers, and the two laser spectrometers are arranged opposite to each other along the first direction of the workpiece to be processed;

The laser spectrometer comprises a laser, a spectrometer component and a marking component. The laser emits a first laser, and the spectrometer component is used to evenly divide the first laser into multiple beams of second lasers. The marking component is used to move the second laser on the transmission axis of the second laser and focus the second laser onto the workpiece to be processed.

Furthermore, the laser scribing mechanism includes N groups of laser spectrometers, which are distributed along the second direction of the workpiece to be processed, and the spacing between any two adjacent groups of laser spectrometers along the second direction is equal, wherein N is an integer greater than or equal to 2, and the second direction and the first direction are arranged perpendicular to each other.

Furthermore, along the second direction of the workpiece to be processed, the second laser output by the Nth group of laser spectrometers and the second laser output by the N-1th group of laser spectrometers are staggered along the third direction of the workpiece to be processed, and the second laser output by the Nth group of laser spectrometers and the second laser output by the N-2th group of laser spectrometers are located at the same position of the third direction of the workpiece to be processed, and the third direction and the second direction are arranged perpendicular to each other.

Furthermore, the staggered spacing of the second laser output by the Nth group of laser spectrometers and the second laser output by the N-1th group of laser spectrometers along the third direction of the workpiece to be processed is 0.5a, wherein a is the spacing between any two adjacent lines in the third direction of the workpiece to be processed.

Furthermore, two of the laser spectrometers in each group of the laser spectrometers are staggered along the third direction of the workpiece to be processed.

Furthermore, the light splitting component includes a light splitting DOE, the light splitting DOE and the laser are coaxially arranged, and the light splitting DOE is used to evenly split the first laser into multiple beams of second laser.

Furthermore, the light splitting component also includes an adjustment bracket, the light splitting DOE is mounted on the adjustment bracket, and the adjustment bracket is used to adjust the position of the light splitting DOE.

Furthermore, the scribing assembly includes a scanning galvanometer assembly and a focusing field lens, the scanning galvanometer assembly is used to move the second laser on the transmission axis of the second laser, and the focusing field lens is used to focus the second laser onto the workpiece to be processed to perform scribing on the workpiece to be processed.

Furthermore, the first laser is arranged along the third direction of the workpiece to be processed, and the scanning galvanometer assembly is used to change the transmission direction of the second laser so that the second laser passes through the focusing field lens and is vertically transmitted to the surface of the workpiece to be processed along the first direction.

The second aspect of the utility model provides a pole piece production line, comprising the laser scribing mechanism as described in the first aspect, and also comprising a conveying device, wherein the conveying device is used to convey the pole piece, and at least one of the laser spectrometers is provided on both side surfaces of the pole piece opposite to each other along the first direction.

The laser scribing mechanism and pole piece production line described in the utility model, the laser scribing mechanism includes at least one group of laser spectrometers, the two laser spectrometers in each group of laser spectrometers are arranged relatively along the thickness direction of the pole piece, and can realize the scribing process on both side surfaces of the pole piece at the same time, thereby improving the efficiency of the pole piece scribing process; and the spectrometer component in the laser spectrometer can divide the first laser into multiple beams of second lasers by energy spectrometry, the scribing component can focus the multiple beams of second lasers, and control the multiple beams of second lasers in parallel, so that the multiple beams of second lasers can be used to scribing the pole piece at the same time, and multi-line etching can be completed by one laser scribing process, thereby improving the efficiency of the pole piece scribing process; in addition, the laser scribing mechanism provided by the utility model can reduce the number of optical path systems. Compared with the prior art of using multiple sets of laser systems for scribing, it has a simple structure and a small size, thereby reducing the production cost of the scribing process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a laser scribing mechanism provided in an embodiment of the present utility model;

FIG. 2 is another schematic diagram of the structure of the laser scribing mechanism provided in an embodiment of the present utility model.

DETAILED DESCRIPTION

The technical solution of the utility model is described clearly and in detail below in conjunction with the accompanying drawings. In the description of the utility model, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

In the description of this specification, the term "as an optional implementation" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one optional embodiment or optional example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

As shown in FIG. 1 , a first aspect of the present embodiment provides a laser scribing mechanism, which is used to scribing a pole piece 10 (i.e., a workpiece to be processed), and the laser scribing mechanism includes at least one set of laser spectrometers;

Each group of laser spectrometers includes two laser spectrometers, and the two laser spectrometers are arranged opposite to each other along the thickness direction of the pole piece 10 (ie, the first direction, the Z-axis direction in FIG. 1 );

Each laser spectrometer includes a laser 20, a spectrometer component 30, and a marking component 40, wherein: the laser 20 emits a first laser, the first laser is a single-beam laser, and after the first laser passes through the spectrometer component 30, the spectrometer component 30 is used to divide the first laser into multiple beams of second lasers; the marking component 40 is used to move the second laser on the transmission axis of the second laser, and focus the second laser onto the pole piece 10 to form multiple focused lasers, so as to form multiple light spots on the surface of the pole piece 10, and perform a marking process on the pole piece 10.

In the present embodiment, the laser scribing mechanism comprises at least one group of laser spectrometers, and the two laser spectrometers in each group of laser spectrometers are arranged relative to each other along the thickness direction of the pole piece, so as to realize the scribing process on both side surfaces of the pole piece at the same time, thereby improving the efficiency of the pole piece scribing process; and the spectrometer component in the laser spectrometer can divide the first laser into multiple beams of second lasers by energy spectrometry, and the scribing component can focus the multiple beams of second lasers and control the multiple beams of second lasers in parallel, so as to realize the scribing process on the pole piece by multiple beams of second lasers at the same time, and multi-line etching can be completed by one laser scribing process, thereby improving the efficiency of the pole piece scribing process; in addition, the laser scribing mechanism provided in the present embodiment can reduce the number of optical path systems. Compared with the prior art of using multiple sets of laser systems for scribing process, it has a simple structure and a small size, thereby reducing the production cost of the scribing process.

As an optional embodiment, the laser scribing mechanism includes N (N is an integer greater than or equal to 2) groups of laser spectrometers, the N groups of laser spectrometers are distributed along the width direction of the pole piece (i.e., the second direction, the Y-axis direction in FIG. 2 ), and the distance between any two adjacent groups of laser spectrometers is equal. In this embodiment, the distance between any two adjacent groups of laser spectrometers is not further limited, and those skilled in the art can set it according to actual conditions.

In this embodiment, the specific number of N is not further limited, and those skilled in the art can set it according to the width of the electrode piece, the scribing spacing, the conveying speed of the electrode piece 10, etc. Exemplarily, the width of the pole piece is 600mm, the spacing between any two adjacent markings is 1mm, the conveying speed of the pole piece is 30m/min (i.e., 500mm/s), if the processing format of the focusing field lens in the marking assembly 40 is 200x200mm, and the maximum speed of the scanning galvanometer assembly is 68000mm/s, then in order to ensure the uniformity of the markings, 4 laser spectrometers are configured in the width direction of the pole piece. In the length direction of the pole piece, according to the total time required for processing each marking, it can be calculated that the number of markings that the scanning galvanometer assembly can process per second is 279, and the spectrometer assembly 30 can divide the first laser into two beams of the second laser. Therefore, the number of markings that the scanning galvanometer assembly of this embodiment can process per second is 558. According to the conveying speed of the pole piece and the spacing between any two adjacent markings, it can be calculated that the number of markings per second is 500. Therefore, according to the number of markings per second and the number of markings that the scanning galvanometer assembly can process per second, it is calculated that 1 laser spectrometer is configured in the length direction of the pole piece. Therefore, four groups of laser spectrometers can be arranged in the width direction of the pole piece, and each group of laser spectrometers can process the pole piece within 150 mm.

As an optional embodiment, along the width direction of the pole piece 10, the second lasers output by any two adjacent groups of laser spectrometers are staggered along the length direction of the pole piece 10 (i.e., the third direction, the X-axis direction in Figures 1 and 2). Specifically, along the width direction of the pole piece 10, the second laser output by the Nth group of laser spectrometers and the second laser output by the N-1th group of laser spectrometers are staggered along the length direction of the pole piece 10, and the second laser output by the Nth group of laser spectrometers and the second laser output by the N-2th group of laser spectrometers are located at the same position in the length direction of the pole piece 10. In this way, it is possible to avoid the second lasers output by two adjacent groups of laser spectrometers having a deeper scribing depth at the intersection than at the non-intersection, resulting in inconsistent scribing depths and uneven scribing on the surface of the pole piece 10, which affects the performance of the pole piece 10.

Exemplarily, four groups of laser spectrometers are arranged along the width direction of the pole piece 10, and the second laser output by the first group of laser spectrometers and the second laser output by the second group of laser spectrometers in the four groups of laser spectrometers are staggered along the length direction of the pole piece 10, the second laser output by the third group of laser spectrometers and the second laser output by the fourth group of laser spectrometers are staggered along the length direction of the pole piece 10, and the second laser output by the first group of laser spectrometers and the second laser output by the third group of laser spectrometers are located at the same position in the length direction of the pole piece 10, and the second laser output by the second group of laser spectrometers and the second laser output by the fourth group of laser spectrometers are located at the same position in the length direction of the pole piece 10.

As an optional embodiment, the second laser output by the Nth group of laser spectrometers and the second laser output by the N-1th group of laser spectrometers are offset by a spacing of 0.5a along the length direction of the pole piece 10, where a is the spacing between any two adjacent scribing lines in the length direction of the pole piece. Thus, by adjusting the spacing between the second lasers output by two adjacent laser spectrometers, it is helpful to ensure the uniformity of the scribing on the surface of the pole piece 10.

In this embodiment, the pole piece 10 includes a first side surface (i.e., an upper surface) and a second side surface (i.e., a lower surface) that are relatively arranged along the thickness direction of the pole piece 10. In this embodiment, the two laser spectrometers in each group of laser spectrometers are relatively arranged along the thickness direction of the pole piece 10, which means that one laser spectrometer is located on the first side surface, and the other laser spectrometer is located on the second side surface. The two laser spectrometers can be symmetrically arranged, or they can be asymmetrically arranged. As an optional embodiment, the two laser spectrometers in each group of laser spectrometers are asymmetrically arranged, and the two laser spectrometers are staggered along the length direction of the pole piece. Specifically, along the length direction of the pole piece, the laser spectrometer located on the first side surface and the laser spectrometer located on the second side surface in each group of laser spectrometers are staggered. As a result, the two laser spectrometers in each group of laser spectrometers are arranged in a staggered manner, which can avoid the focused lasers on the two side surfaces of the pole piece 10 from focusing and marking the same position of the pole piece 10, so that the pole piece 10 has a safety risk of excessive etching.

In this embodiment, the specific spacing of the two laser splitting devices along the length direction of the pole piece is not further limited, and those skilled in the art can set it according to actual conditions.

As an optional embodiment, the spectroscopic component 30 includes a spectroscopic DOE and an adjustment bracket. The spectroscopic DOE is mounted on the adjustment bracket, and the spectroscopic DOE and the laser 20 are coaxially arranged to achieve that the first laser emitted from the laser 20 can be transmitted to the spectroscopic DOE along its transmission axis, so that the spectroscopic DOE can evenly divide the first laser into multiple beams of second lasers. The adjustment bracket is used to adjust the position of the spectroscopic DOE to improve the accuracy of the position of the spectroscopic DOE. In this embodiment, when the adjustment bracket adjusts the spectroscopic DOE, the spectroscopic DOE can be tilted, pitched and rotated. In this embodiment, the specific structure of the adjustment bracket is not further limited, and technicians in this field can set it according to actual conditions.

In this embodiment, the number of second laser beams divided by the splitter DOE is not further limited, and those skilled in the art can set it according to actual conditions. For example, a splitter DOE that splits the first laser into two second laser beams can be selected, a splitter DOE that splits the first laser into three second laser beams can be selected, or a splitter DOE that splits the first laser into four second laser beams can be selected.

A spectroscopic DOE (Diffractive Optical Elements) can split a laser beam into multiple identical laser beams. As an optional implementation, the beam uniformity of the spectroscopic DOE selected in this embodiment is higher than 95%, so that when the pole piece is scribing, multiple second laser beams can be controlled in parallel while also meeting the high uniformity of the spectroscopic beam, thereby achieving a better effect of the pole piece scribing process. In this embodiment, the specific model of the spectroscopic DOE is not further limited, and a technician in this field can determine the specific model of the spectroscopic DOE based on the number of spectroscopic beams.

As an optional implementation, a locking member may be further provided on the adjustment bracket, and the locking member is used to lock the light splitting DOE to prevent the position of the light splitting DOE from moving and affecting the uniformity of the light splitting of the light splitting DOE. This embodiment does not further limit the specific structure of the locking member, and those skilled in the art may set it according to actual conditions. For example, the locking member may be a snap-on locking member.

In this embodiment, the scribing assembly 40 includes a scanning galvanometer assembly and a focusing field lens, wherein: the scanning galvanometer assembly is used to move the second laser on the transmission axis of the second laser to form a preset laser scribing track on the pole piece 10; the focusing field lens is used to focus the second laser on the pole piece 10 to form a plurality of light spots on the surface of the pole piece 10, and to scribing the pole piece 10. Specifically, the scanning galvanometer assembly can make the output second laser move dynamically within the plane area to form a preset laser scribing track. As an optional embodiment, the scanning galvanometer assembly includes an X galvanometer, a Y galvanometer, a first driving member and a second driving member, the X galvanometer and the Y galvanometer are arranged in sequence, the first driving member is connected to the rotating shaft of the X galvanometer, the first driving member is used to drive the X galvanometer to rotate, so that the X galvanometer moves the second laser in the length direction of the pole piece; the second driving member is connected to the rotating shaft of the Y galvanometer, and the second driving member is used to drive the Y galvanometer to rotate, so that the Y galvanometer moves the second laser in the width direction of the pole piece. Thus, through the X galvanometer and the Y galvanometer, the second laser can form a preset scribing track on the pole piece.

In this embodiment, the first laser is set along the third direction. After the splitter component 30 divides the first laser into multiple beams of second lasers set along the third direction, the scanning galvanometer component can change the transmission direction of the second laser so that the second laser is set along the first direction, so that the second laser is focused by the focusing field lens and then projected onto the surface of the pole piece 10 along the first direction.

As an optional embodiment, each laser spectrometer further includes a controller, which can be electrically connected to the first driver and the second driver respectively, and the controller can control the first driver and the second driver to work independently, and the controller can input a preset scribing trajectory to the first driver and the second driver, so that the first driver drives the X galvanometer to rotate rapidly, and the second driver can also drive the Y galvanometer to rotate rapidly, so that the second laser forms a preset scribing trajectory on the pole piece. In addition, the controller can also be electrically connected to the laser 20 to control the laser 20 to emit the first laser. In this embodiment, the specific type of the controller is not further limited, and those skilled in the art can select it according to actual conditions. For example, the controller can be a motion control card, and after the motion control card receives the operation instruction of the laser 20, it controls the laser 20 to emit the first laser, and after the motion control card receives the graphic instruction, it controls the first driver and the second driver to work, so that the second laser forms a preset scribing trajectory on the pole piece.

The second aspect of this embodiment provides a pole piece production line, which includes the laser scribing mechanism described in the first aspect. Therefore, by arranging the laser scribing mechanism on the pole piece production line, the pole piece 10 in motion can be laser scribed by the laser scribing mechanism during the conveying process, which is beneficial to improving the production efficiency of the pole piece 10.

In this embodiment, the electrode production line further includes a conveying device, which is used to convey the electrode 10 so that the electrode 10 is transported along the length direction of the electrode, and at least two laser spectrometers are arranged opposite to each other along the thickness direction of the electrode 10, and the laser spectrometers can project the focused second laser vertically onto the first side surface and the second side surface of the electrode 10. In this embodiment, the specific structure of the conveying device is not further limited, and those skilled in the art can select it according to actual conditions. For example, the conveying device can be a conveyor belt.

Although the disclosure is as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims (10)

1. The laser scribing mechanism is characterized by being used for scribing a workpiece to be processed and comprises at least one group of laser beam splitting devices;

Each group of laser beam splitting devices comprises two laser beam splitting devices, and the two laser beam splitting devices are oppositely arranged along the first direction of the workpiece to be processed;

The laser beam splitting device comprises a laser, a beam splitting component and a scribing component, wherein the laser emits first laser, and the beam splitting component is used for splitting the first laser into a plurality of second laser beams; the scribing assembly is used for moving the second laser on the transmission axis of the second laser and focusing the second laser on the workpiece to be processed.

2. The laser scribing mechanism according to claim 1, wherein the laser scribing mechanism comprises N groups of the laser beam splitting devices, the N groups of the laser beam splitting devices are distributed along a second direction of the workpiece to be processed, and a distance between any two adjacent groups of the laser beam splitting devices along the second direction is equal, wherein N is an integer greater than or equal to 2, and the second direction and the first direction are mutually perpendicular.

3. The laser scribing mechanism according to claim 2, wherein, along a second direction of the workpiece to be processed, the second laser output by the nth group of laser beam splitting devices and the second laser output by the nth-1 group of laser beam splitting devices are arranged in a staggered manner along a third direction of the workpiece to be processed, and the second laser output by the nth group of laser beam splitting devices and the second laser output by the nth-2 group of laser beam splitting devices are positioned at the same position of the workpiece to be processed in the third direction, and the third direction and the second direction are mutually perpendicular.

4. The laser scribing mechanism as in claim 3, wherein a pitch between the second laser output by the nth group of the laser beam splitting devices and the second laser output by the N-1 th group of the laser beam splitting devices is 0.5a, wherein a is a pitch between any two adjacent scribing lines in the third direction of the workpiece to be processed.

5. A laser scribing mechanism as in claim 3, wherein two of the laser splitting devices in each set are arranged offset along a third direction of the workpiece to be processed.

6. The laser scribing mechanism as in claim 1, wherein the beam splitting assembly comprises a beam splitting DOE coaxially disposed with the laser, the beam splitting DOE for splitting the first laser beam equally into a plurality of second laser beams.

7. The laser scribing mechanism as in claim 6, wherein the beam splitting assembly further comprises an adjustment bracket, the beam splitting DOE being mounted on the adjustment bracket, the adjustment bracket being for adjusting a position of the beam splitting DOE.

8. A laser scribing mechanism as in claim 3, wherein the scribing assembly comprises a scanning galvanometer assembly for moving the second laser on a transmission axis of the second laser and a focusing field lens for focusing the second laser onto the workpiece to be scribed.

9. The laser scribing mechanism as in claim 8, wherein the first laser beam is disposed along a third direction of the workpiece to be processed, and the scanning galvanometer assembly is configured to change a transmission direction of the second laser beam, so that the second laser beam is vertically transmitted to the surface of the workpiece to be processed along the first direction after passing through the focusing field lens.

10. A pole piece production line, characterized by comprising the laser scribing mechanism according to any one of claims 1 to 9, and further comprising a conveying device for conveying pole pieces, wherein at least one laser beam splitting device is arranged on two opposite side surfaces of the pole pieces along a first direction.