Battery cell pole piece laser cleaning device and laser cleaning method

Abstract

The invention discloses a battery cell pole piece laser cleaning device. The device comprises a conveying mechanism and a laser cleaning mechanism. The conveying mechanism is used for conveying the battery cell pole piece to the cleaning station; the laser cleaning mechanism is arranged corresponding to the cleaning station and is used for emitting first laser and second laser, so that the first laser and the second laser clean the battery cell pole piece according to a pre-cleaning mode; wherein the pre-cleaning mode comprises a splicing cleaning mode and / or a pursuit cleaning mode, and the splicing cleaning mode is that the first laser and the second laser synchronously work and jointly clean the same to-be-cleaned layer of the battery cell pole piece; the pursuit cleaning mode is that when one of the first laser and the second laser cleans the upper to-be-cleaned layer to expose the adjacent lower to-be-cleaned layer, the other laser pursues the cleaning path of the upper to-be-cleaned layer to clean the lower to-be-cleaned layer. In this way, through cooperative work of the first laser and the second laser, the cleaning efficiency of the battery cell pole piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell pole piece preparation, and in particular to a battery cell pole piece laser cleaning device and a cleaning method. Background Art

[0002] In recent years, the new energy industry has developed rapidly, and the driving time of power batteries has gradually increased from 300km to 600km. Among them, the electrode, as an important component of lithium batteries, plays an important role in battery performance.

[0003] The current electrode cleaning methods using chemical reagents and mechanical cleaning are inefficient, polluting, and unstable in process effect. Laser cleaning is currently an ideal environmentally friendly and efficient cleaning method. In the existing laser electrode cleaning devices, most cleaning equipment slot cleaning is basically concentrated on a single laser single station. The wide electrode is divided into single strips by the striping equipment, and a single set of laser system cleans the slot, and the cleaning efficiency is relatively low. Summary of the invention

[0004] The present application provides a battery cell pole piece laser cleaning device and a cleaning method, aiming to solve the problem of low cleaning efficiency of battery cell pole pieces in the prior art.

[0005] To achieve the above-mentioned purpose, the present application proposes a battery cell pole piece laser cleaning device. The battery cell pole piece laser cleaning device comprises:

[0006] A conveying mechanism, used for conveying the battery cell pole pieces, wherein a cleaning station for cleaning the battery cell pole pieces is provided on the conveying path of the battery cell pole pieces;

[0007] A laser cleaning mechanism is arranged at one side of the conveying path corresponding to the cleaning station, and is used to emit a first laser and a second laser, and make the first laser and the second laser perform a cleaning operation on the battery cell electrode sheet in a pre-cleaning mode;

[0008] Among them, slots to be cleaned are set on the battery cell pole piece, and the slots to be cleaned are cleaned layer by layer according to the pre-cleaning mode; the pre-cleaning mode includes a splicing cleaning mode and / or a chasing cleaning mode, and the splicing cleaning mode is that the first laser and the second laser work synchronously to jointly clean the same layer to be cleaned of the battery cell pole piece; the chasing cleaning mode is that when one of the first laser and the second laser cleans the upper layer to be cleaned to expose the lower layer to be cleaned adjacent thereto, the other laser chases the cleaning path of the upper layer to be cleaned to clean the lower layer to be cleaned.

[0009] In some embodiments, the laser cleaning mechanism includes a first laser, a second laser, a galvanometer assembly and a field lens. The first laser and the second laser are independent of each other and are both connected to the galvanometer assembly, and are respectively used to emit a first laser and a second laser into the galvanometer assembly. After the galvanometer assembly adjusts the direction of the light beam, the field lens focuses the first laser and the second laser on the battery cell electrode.

[0010] In some embodiments, the galvanometer assembly includes a mounting seat, a first lens group and a second lens group; a cavity is formed in the mounting seat, and the first lens group and the second lens group are both disposed in the cavity;

[0011] The first lens group is connected to the first laser, and the second lens group is connected to the second laser; the first lens group and the second lens group both include an adjustable X reflector and a Y reflector.

[0012] In some embodiments, a beam expander is further included. A first beam expander is disposed between the first laser and the first lens group, and a second beam expander is disposed between the second laser and the second lens group.

[0013] In some embodiments, it also includes:

[0014] A negative pressure component, arranged at the other side of the conveying path corresponding to the cleaning station, for providing negative pressure to maintain the stability of the battery cell electrode sheet;

[0015] A positioning component is arranged upstream of the laser cleaning mechanism along the conveying direction of the battery cell pole piece, and is used to locate the position of the battery cell pole piece so that the corresponding laser cleaning mechanism can perform a cleaning operation.

[0016] In some embodiments, a dust extraction component is further included, which is arranged corresponding to the cleaning station, and the dust extraction component is used to suck out dust particles generated during the cleaning operation of the battery cell pole piece.

[0017] In some embodiments, the laser cleaning mechanism is provided in two groups, including a first laser cleaning mechanism and a second laser cleaning mechanism. The first laser cleaning mechanism and the second laser cleaning mechanism are arranged upstream and downstream on both sides of the conveying path of the battery cell pole piece to clean the slots to be cleaned on both sides of the battery cell pole piece.

[0018] The present application also discloses a method for laser cleaning of a battery cell pole piece, which is used in the laser cleaning device as described above, and comprises:

[0019] The conveying mechanism conveys the battery cell electrodes to the cleaning station;

[0020] The laser cleaning mechanism emits a first laser and a second laser to clean the slots to be cleaned on the battery cell pole piece layer by layer in a pre-cleaning mode.

[0021] In some embodiments, the battery cell pole piece laser cleaning method further includes:

[0022] The conveying mechanism stops after conveying the cell electrode piece to the cleaning station, and the negative pressure component negatively absorbs the cell electrode piece to keep the cell electrode piece fixed; the laser cleaning mechanism emits the first laser and the second laser to clean the slots to be cleaned on the fixed cell electrode piece layer by layer in a pre-cleaning mode; or,

[0023] The conveying mechanism conveys the battery cell pole pieces to the cleaning station, the negative pressure component negatively adsorbs the battery cell pole pieces to ensure that the battery cell pole pieces are conveyed smoothly, and the laser cleaning mechanism emits a first laser and a second laser to clean the slots to be cleaned on the continuously conveyed battery cell pole pieces layer by layer in a pre-cleaning mode.

[0024] In some embodiments, the battery cell pole piece laser cleaning method further includes:

[0025] The conveying mechanism conveys the cell pole piece to the first cleaning station, and the first laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on one side of the cell pole piece layer by layer in a pre-cleaning mode; and

[0026] The conveying mechanism continues to convey the battery cell pole piece to the second cleaning station, and the second laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on the other side of the battery cell pole piece layer by layer in a pre-cleaning mode.

[0027] The technical solution of the present application proposes a laser cleaning device for a cell pole piece. The cell pole piece laser cleaning device comprises a conveying mechanism and a laser cleaning mechanism; the conveying mechanism is used to convey the cell pole piece, and a cleaning station for cleaning the cell pole piece is arranged on the conveying path of the cell pole piece; the laser cleaning mechanism is arranged on one side of the conveying path corresponding to the cleaning station, and the laser cleaning mechanism is used to emit a first laser and a second laser, and the first laser and the second laser perform a cleaning operation on the cell pole piece in a pre-cleaning mode; wherein, a slot to be cleaned is arranged on the cell pole piece, and the slot to be cleaned is cleaned layer by layer in the pre-cleaning mode; the pre-cleaning mode comprises a splicing cleaning mode and / or a chasing cleaning mode, and the splicing cleaning mode is that the first laser and the second laser work synchronously to jointly clean the same layer to be cleaned of the cell pole piece; the chasing cleaning mode is that when one of the first laser and the second laser cleans the upper layer to be cleaned to expose the lower layer to be cleaned adjacent thereto, the other laser chases the cleaning path of the upper layer to be cleaned to clean the lower layer to be cleaned. In this way, the splicing cleaning mode divides the layer to be cleaned into two parts and processes them in parallel, shortening the cleaning time. In the chasing cleaning mode, one laser cleans the upper layer while another laser follows to clean the lower layer, achieving continuous operation and avoiding waiting time, both of which can improve cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0029] Figure 1 This is a schematic structural diagram of a battery cell pole piece laser cleaning device according to an embodiment of the present application;

[0030] Figure 2 for Figure 1 Schematic diagram of the structure of the galvanometer assembly;

[0031] Figure 3 This is a schematic diagram of the pre-cleaning mode of this application;

[0032] Figure 4 Schematic diagram of the process of laser cleaning method for battery cell pole pieces according to one embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that, unless otherwise specified or limited, all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] It should also be noted that, unless otherwise specified or limited, when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] In addition, unless otherwise specified or limited, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0037] See also Figure 1 As shown, the present application provides a laser cleaning device for battery cell pole pieces. The battery cell pole pieces are transported in the form of a material strip connected end to end, and the laser cleaning device realizes the cleaning operation of the slots to be cleaned on the battery cell pole pieces.

[0038] Specifically, the battery cell pole piece laser cleaning device mainly includes two parts: a conveying mechanism 10 and a laser cleaning mechanism 20. The function of the conveying mechanism 10 is to be responsible for the movement of the battery cell pole piece, ensuring that the battery cell pole piece can be smoothly transported on the designated conveying path. For example, the conveying mechanism 10 can be a roller structure that conveys the pole piece material strip; and a cleaning station is provided on the conveying path of the battery cell pole piece, so as to perform the cleaning operation of the battery cell pole piece at this station. The laser cleaning mechanism 20 is arranged on one side of the conveying path corresponding to the cleaning station, and is used to emit two laser beams, a first laser 211 and a second laser 222, and control the two laser beams to cooperate in performing accurate and efficient cleaning operations on the battery cell pole piece according to a pre-set cleaning mode.

[0039] Among them, the battery cell pole piece is provided with a slot to be cleaned, and the laser cleaning mechanism 20 cleans the slot to be cleaned layer by layer according to the pre-cleaning mode. The pre-cleaning mode includes a splicing cleaning mode and / or a chasing cleaning mode. The splicing cleaning mode is that the first laser 211 and the second laser 222 work synchronously to jointly clean the same layer to be cleaned of the battery cell pole piece; illustratively, the splicing cleaning mode can be that the first laser 211 and the second laser 222 clean the left and right halves or the upper and lower halves of the battery cell pole piece respectively, so as to form a splicing to jointly clean the same layer to be cleaned. The pursuit cleaning mode is that when one of the first laser 211 and the second laser 222 cleans the upper layer to be cleaned to expose the lower layer to be cleaned adjacent thereto, the other laser pursues the cleaning path of the upper layer to be cleaned to clean the lower layer to be cleaned; illustratively, the pursuit cleaning mode can be that the first laser 211 is started first to clean the first layer to be cleaned of the battery cell electrode piece first, so that in the process of the first laser 211 gradually cleaning the first layer to be cleaned, the second layer to be cleaned adjacent to the first layer to be cleaned will gradually be exposed, and the second laser 222 can be delayed in starting, and after the second layer to be cleaned begins to be exposed or partially exposed, the second laser 222 starts the cleaning operation along the cleaning path of the first laser 211.

[0040] It can be understood that the splicing cleaning mode can quickly cover the entire layer to be cleaned through the joint action of the first laser 211 and the second laser 222, thereby improving the cleaning efficiency; while the pursuit cleaning mode can ensure the continuity of cleaning of each layer through the alternating cooperation of the first laser 211 and the second laser 222, avoiding long waiting times when cleaning multiple layers, thereby improving the overall cleaning efficiency. Through the flexible switching and cooperation of these two modes, the cleaning efficiency can be improved, effectively solving the problem of low efficiency in traditional cleaning methods.

[0041] The switching or coordination between the splicing cleaning mode and the pursuit cleaning mode can be flexibly adjusted according to the actual cleaning requirements and cleaning effects of the battery cell pole piece. In the process of cleaning the battery cell pole piece with multiple layers (such as three layers) to be cleaned, there can be a combination of multiple different cleaning methods; Figure 3 The schematic diagram of the scheme shown includes:

[0042] 1. The three layers to be cleaned are cleaned alternately by the first laser 211 and the second laser 222 .

[0043] 2. The first laser 211 cleans the first layer, the second laser 222 follows the cleaning path of the first laser 211 to clean the second layer, and the third layer is cleaned by splicing the left and right first lasers 211 and the second lasers 222 together.

[0044] 3. In the three layers to be cleaned, the first laser 211 is used to clean the left half of the cell pole piece, and the second laser 222 is used to clean the right half of the cell pole piece.

[0045] 4. The first and second layers are cleaned by using the upper and lower first laser 211 and second laser 222 splicing cleaning mode, and the third layer is cleaned by using the second laser 222.

[0046] 5. In the three layers to be cleaned, the first laser 211 is used to clean the upper half of the cell pole piece, and the second laser 222 is used to clean the lower half of the cell pole piece.

[0047] 6. The first layer is cleaned by using the upper and lower first laser 211 and second laser 222 splicing cleaning mode, the first laser 211 cleans the second layer, and the second laser 222 follows the cleaning path of the first laser 211 to clean the third layer.

[0048] In some embodiments, the laser cleaning mechanism 20 includes a first laser 21, a second laser 22, a galvanometer assembly 23 and a field lens 24. The first laser 21 and the second laser 22 are independent of each other and are both connected to the galvanometer assembly 23, and are used to emit a first laser 211 and a second laser 222 into the galvanometer assembly 23, respectively. After the galvanometer assembly 23 adjusts the direction of the beam, the field lens 24 focuses the first laser 211 and the second laser 222 on the battery cell pole piece. Based on the structural design of the laser cleaning mechanism 20, a workflow for cleaning is as follows:

[0049] The first laser 21 and the second laser 22 emit the first laser 211 and the second laser 222 respectively. The two laser beams are incident on the galvanometer assembly 23. The galvanometer assembly 23 quickly and accurately adjusts the direction of the laser beam according to the preset cleaning mode, and then focuses on the slot to be cleaned of the battery cell pole piece through the field lens 24. The high-energy laser beam generates a thermal effect on the surface of the battery cell pole piece, thereby effectively achieving a cleaning effect.

[0050] It is worth noting that during multi-layer cleaning, the laser power, cleaning speed and laser filling spacing of each layer are different. For example, in the first layer, in order to quickly remove most of the graphite layer on the surface of the battery cell pole piece, a high-power laser is used, and the laser cleaning speed is appropriately increased and a larger filling spacing is selected to produce a stronger thermal effect and speed up the cleaning speed. After the first layer of cleaning, the contaminants to be cleaned on the surface of the battery cell pole piece have been greatly reduced, so a smaller laser power can be used to remove the remaining residues, reduce the thermal impact on the battery cell pole piece, and adjust the cleaning speed and laser filling spacing according to the tolerance of the battery cell pole piece to avoid unnecessary damage.

[0051] Therefore, through the above-mentioned refined arrangement of laser cleaning strategy, not only the cleanliness of the battery cell pole pieces can be effectively improved, but also their service life can be significantly extended, ensuring that the battery cell pole pieces maintain optimal performance in subsequent processes.

[0052] In some embodiments, the galvanometer assembly 23 includes a mounting seat, a first lens group, and a second lens group. The mounting seat is the basic structure of the galvanometer assembly 23, providing a stable support platform, and the interior of the mounting seat is designed as a cavity, which provides sufficient installation space for the first and second lens groups, and also ensures that the lens groups will not be disturbed by the external environment during operation, thereby improving the stability and accuracy of the assembly.

[0053] The first and second lasers 22 and the field lens 24 are both arranged on the mounting seat, the first lens group is connected to the first laser 21, and the second lens group is connected to the second laser 22, so as to form two laser cleaning optical paths. Each lens group is responsible for receiving and reflecting the laser beam from a specific laser, which increases the flexibility and versatility of the system. Both the first lens group and the second lens group have an adjustable X-reflector 231 and a Y-reflector 232, such as Figure 2 As shown, the angles of the X and Y reflectors 232 in each lens group are adjusted by a motor, so that the first laser 211 and the second laser 222 can be accurately controlled to operate according to the laser path to achieve splicing cleaning and / or chasing cleaning effects.

[0054] See also Figure 1 As shown, in some embodiments, the laser cleaning mechanism 20 further includes a beam expander, a first beam expander 25 is disposed between the first laser 21 and the first lens group, and a second beam expander 26 is disposed between the second laser 22 and the second lens group.

[0055] In this embodiment, by providing the first beam expander 25 and the second beam expander 26, the laser beams emitted by the first laser 21 and the second laser 22 can be independently expanded and adjusted to meet the specific requirements of laser beam parameters for different cleaning needs of the battery cell pole piece. The flexibility and adaptability of laser cleaning can be further enhanced, so that the laser cleaning device can more accurately control the distribution and energy density of the laser beam on the battery cell pole piece, thereby improving the cleaning effect and cleaning efficiency.

[0056] In summary, the laser cleaning mechanism 20 proposed in this application is actually a double-headed galvanometer mechanism, where two lasers are integrated into one galvanometer assembly 23, which helps save the installation space of the equipment and improves the space utilization. Furthermore, by further adjusting the light beam through the double-headed galvanometer, the two lasers can work together to improve the cleaning efficiency of the battery cell pole piece.

[0057] See also Figure 1 As shown, in some embodiments, the laser cleaning device further includes a negative pressure component 30 and a positioning component 40. The negative pressure component 30 is arranged on the other side of the conveying path corresponding to the cleaning station, and is used to provide negative pressure to maintain the stability of the battery cell pole piece; the positioning component 40 is arranged relatively upstream of the laser cleaning mechanism 20 along the conveying direction of the battery cell pole piece, and is used to locate the position of the battery cell pole piece so that the corresponding laser cleaning mechanism 20 performs the cleaning operation.

[0058] It can be understood that the negative pressure degree of the negative pressure component 30 on the transported battery cell pole piece is adjustable, and the battery cell pole piece can be lightly adsorbed and heavily adsorbed. Among them, in the case of heavy adsorption, the start and stop operation of the conveying mechanism 10 is usually adapted, including that after the conveying mechanism 10 conveys the battery cell pole piece to the cleaning station, the conveying mechanism 10 stops conveying, and then the negative pressure component 30 is started to adsorb and fix the battery cell pole piece. At this time, the battery cell pole piece is fixed, so that the cleaning operation of the battery cell pole piece can be achieved in the static mode. In the case of light adsorption, it is intended to generate a light adsorption force when the battery cell pole piece passes through the cleaning station. The light adsorption force is intended to maintain the smooth transportation of the battery cell pole piece, so that in the flight mode, the laser cleaning mechanism 20 can cooperate to achieve the cleaning operation when the battery cell pole piece passes through the cleaning station. Among them, the positioning component 40 is a vacuum adsorption component, including an adsorption table set corresponding to the cleaning station, and a plurality of adsorption holes are set on the adsorption table for generating adsorption force.

[0059] Furthermore, a positioning assembly 40 is provided upstream of the laser cleaning mechanism 20 and arranged relatively along the conveying direction of the battery cell pole piece. The main function of the positioning assembly 40 is to locate the position of the slot to be cleaned on the battery cell pole piece, so that after being conveyed to the cleaning station, the laser cleaning mechanism 20 can accurately perform the cleaning operation. The problem of incomplete cleaning or excessive cleaning caused by position deviation is avoided. Among them, the positioning assembly 40 adopts a photoelectric sensor.

[0060] It is worth noting that the positioning component 40 is arranged upstream of the laser cleaning mechanism 20 so as to adapt to the cleaning operation in the flight mode, locate the position of the slot to be cleaned on the battery cell pole piece in advance, reserve the reaction time of the laser cleaning mechanism 20, and ensure that when the battery cell pole piece moves through, the laser beam can also be accurately aimed at the target for cleaning, thereby effectively improving the cleaning accuracy and efficiency.

[0061] In addition, the laser cleaning device also includes a dust extraction component 50 corresponding to the cleaning station, which is used to suck out dust particles generated during the cleaning process of the battery cell pole piece. The design of the dust extraction component 50 can not only reduce the pollution to the working environment, but also prevent these dust particles from reattaching to the battery cell pole piece and affecting the cleaning effect.

[0062] Therefore, by optimizing the synergy of each component, the laser cleaning device achieves efficient management of the battery cell electrode cleaning process, ensuring the dual improvement of cleaning quality and production efficiency.

[0063] In some embodiments, the laser cleaning mechanism 20 is provided with two groups, including a first laser cleaning mechanism and a second laser cleaning mechanism. The first laser cleaning mechanism and the second laser cleaning mechanism are arranged upstream and downstream on both sides of the conveying path of the battery cell pole piece to clean the slots to be cleaned on both sides of the battery cell pole piece.

[0064] In this embodiment, the design of the dual laser cleaning mechanism 20 can achieve double-sided cleaning of the battery cell pole piece, improve adaptability and greatly improve cleaning efficiency, and shorten the cleaning cycle. The first laser cleaning mechanism and the second laser cleaning mechanism clean both sides of the battery cell pole piece respectively, ensuring the uniformity and consistency of cleaning. At the same time, the upstream and downstream separate layout makes it unnecessary to perform additional flipping or adjustment of the battery cell pole piece during transportation, which simplifies the cleaning process and reduces the difficulty of operation.

[0065] The present application also discloses a method for laser cleaning of a battery cell pole piece, which is used in the above laser cleaning device, such as Figure 4 As shown, the laser cleaning method comprises the following steps:

[0066] Step S10: The conveying mechanism conveys the battery cell electrode to a cleaning station.

[0067] In this step, the conveying mechanism is started to smoothly and accurately convey the battery cell pole pieces to the cleaning station, ensuring the positioning accuracy and stability of the battery cell pole pieces during the cleaning process.

[0068] Among them, the battery cell pole pieces can be conveyed in the form of a material belt, and the conveying mechanism can be a roller structure. The conveying mechanism is further equipped with a positioning component, such as a photoelectric sensor, to monitor the position and state of the battery cell pole pieces to ensure the accuracy of the cleaning process.

[0069] Step S20 , the laser cleaning mechanism emits the first laser and the second laser to clean the slots to be cleaned on the battery cell electrode layer by layer in a pre-cleaning mode.

[0070] In this step, the cleaning operation can be a cleaning mode selected and implemented according to the actual cleaning requirements and cleaning effects. As mentioned above, the pre-cleaning mode includes splicing cleaning and / or chasing cleaning. The splicing cleaning mode is that the first laser and the second laser work synchronously to jointly clean the same layer to be cleaned of the cell pole piece; exemplarily, the splicing cleaning mode can be that the first laser and the second laser respectively clean the left and right halves or the upper and lower halves of the cell pole piece to form a joint cleaning of the same layer to be cleaned. The chasing cleaning mode is that when one of the first laser and the second laser cleans the upper layer to be cleaned to expose the lower layer to be cleaned adjacent to it, the other laser chases the cleaning path of the upper layer to be cleaned to clean the lower layer to be cleaned; exemplarily, the chasing cleaning mode can be that the first laser is started first, and the first layer to be cleaned of the cell pole piece is started first, so that in the process of the first laser gradually cleaning the first layer to be cleaned, the second layer to be cleaned adjacent to the first layer to be cleaned will gradually appear, and the second laser can be delayed start, after the second layer to be cleaned begins to appear or partially appears, the second laser starts the cleaning operation along the cleaning path of the first laser.

[0071] The laser cleaning mechanism includes the first laser, the second laser, the galvanometer assembly, the field lens and the beam expander structure mentioned above, which will not be described in detail here. Through the flexible switching and coordination of these two modes, the cleaning efficiency can be improved, effectively solving the problem of low efficiency in traditional cleaning methods.

[0072] In some embodiments, the battery cell pole piece laser cleaning method also includes two application states, including:

[0073] In the first application state, the position of the slot to be cleaned on the battery cell electrode is located by the positioning component, and then after being transported to the cleaning station, the conveying mechanism stops conveying, and then the negative pressure component is started to adsorb and fix the battery cell electrode, and the laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on the fixed battery cell electrode layer by layer in the pre-cleaning mode.

[0074] This state is the cleaning of the battery cell pole piece in static mode, with precise positioning. After the battery cell pole piece is fixed, the laser cleaning mechanism is turned on to perform high-precision cleaning. Because of its stability and effective use of materials, the static mode is also particularly suitable for verifying the laser cleaning efficiency of different pre-cleaning modes.

[0075] Among them, it is assumed that the size of the slot to be cleaned is L in length and M in width. After preliminary testing, the cleaning of the slot to be cleaned needs to be divided into three layers of laser cleaning to clean it. The first layer needs to use high power to clean most of the graphite surface, and then use low-power laser to clean the second and third layers. The power, cleaning speed and filling spacing of each layer are different. The second and third layers are to clean the remaining residues on the basis of the first layer and finally clean it. Finally, the following verification plan is available.

[0076] Solution 1

[0077] The first laser cleans the first layer from bottom to top, with a cleaning size of L*M. The first laser cleans with the first laser first, with a delay of 10-30ms. The second laser starts to clean with the second laser, following the same path as the first laser, from bottom to top, and starts to clean the second layer closely following the first laser. When the first laser finishes cleaning the first layer, it immediately starts to clean the third layer. At this time, the third layer starts to clean the part of the second layer that has been cleaned.

[0078] Advantages: Save waiting time for the second and third layer laser operations.

[0079] Solution 2

[0080] The first laser cleans the first layer from bottom to top, with a cleaning size of L*M. The first laser emits light for cleaning first, with a delay of 10-30ms. The second laser starts to emit the second laser, following the same path as the first laser, from bottom to top, and starts to clean the second layer closely following the first laser. After the first and second layers are cleaned, the first laser and the second laser simultaneously clean half of the third layer, with a cleaning size of 1 / 2L*M.

[0081] Advantages: Efficiency: It saves half the time of the third layer compared to Solution 1.

[0082] Option 3

[0083] For the first, second and third layers, the first laser cleans the left 1 / 2L*M, and the second laser cleans the right 1 / 2L*M. The right half of the second and third layers is slightly larger than the left half by about 0.5mm to prevent splicing marks at the middle joint.

[0084] Option 4

[0085] For the first and second layers, the first laser cleans the upper half, and the second laser cleans the lower half, i.e., L*1 / 2M. After the first and second layers are cleaned, the second laser cleans the third layer.

[0086] Advantages: The efficiency of the first and second layers is doubled.

[0087] Option 5

[0088] For the first, second and third layers, the first laser cleans the upper part and the second laser cleans the lower part, i.e. L*1 / 2M. The lower part of the second and third layers is slightly larger by about 0.5mm than the upper part, in order to prevent splicing marks at the middle joint.

[0089] Advantages: Three-layer cleaning, the efficiency of each layer is doubled, and finally this solution is the most efficient set of solutions, with an efficiency increase of 100%.

[0090] Option 6

[0091] The first laser of the first layer cleans the upper half, and the second laser cleans the lower half, i.e., L*1 / 2M. Then the second laser cleans the second layer, with a delay of 10-30ms. The first laser chases the second laser to clean the third layer.

[0092] Advantages: Save 1.5 times the second laser cleaning time.

[0093] Thermal impact of six solutions: TD≤100μm, MD≤150μm, dimensional accuracy±0.2mm

[0094] Therefore, based on the test results of start-stop laser cleaning, the feasibility, efficiency and quality data of six different process solutions were obtained, and the best solution (Scheme 5) was selected. According to the best solution, cleaning in flight mode, that is, the second application state, was carried out.

[0095] The second application state is the flight mode. The positioning component locates the position of the slot to be cleaned on the battery cell pole piece in advance, and reserves the reaction time of the laser cleaning mechanism. When the conveying mechanism conveys the battery cell pole piece through the cleaning station, the negative pressure component generates a slight adsorption force, which is intended to maintain the smooth conveying of the battery cell pole piece. In the process of the battery cell pole piece passing through the cleaning station, it cooperates with the laser cleaning mechanism to realize the cleaning operation, that is, the laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on the continuously conveyed battery cell pole piece layer by layer in the pre-cleaning mode. In this way, even when the battery cell pole piece moves through, the laser beam can accurately complete the cleaning operation, effectively improving the cleaning accuracy and efficiency.

[0096] The second application state is to complete the cleaning while the cell pole piece is moving through, which has a higher cleaning efficiency. It is worth noting that in the second application state, that is, flight mode, the moving cell pole piece needs to have a higher degree of coordination with the laser cleaning mechanism, which can be solved through precise control and algorithm optimization to ensure that the laser beam can still perform accurate cleaning operations on the cell pole piece in a dynamic environment.

[0097] In some embodiments, to achieve double-sided cleaning of battery cell pole pieces, the battery cell pole piece laser cleaning method also includes: a conveying mechanism conveys the battery cell pole piece to a first cleaning station, and a first laser cleaning mechanism emits a first laser and a second laser to clean the to-be-cleaned slots on one side of the battery cell pole piece layer by layer in a pre-cleaning mode; and, the conveying mechanism continues to convey the battery cell pole piece to a second cleaning station, and a second laser cleaning mechanism emits a first laser and a second laser to clean the to-be-cleaned slots on the other side of the battery cell pole piece layer by layer in a pre-cleaning mode.

[0098] Among them, in order to achieve double-sided cleaning of the battery cell pole piece, a corresponding structural design is included. As mentioned above, there are two cleaning stations set on the conveying path, including a first cleaning station and a second cleaning station, and each cleaning station is correspondingly provided with a negative pressure component, a positioning component and a dust extraction component. In addition, two groups of corresponding laser cleaning mechanisms are provided, such as a first laser cleaning mechanism and a second laser cleaning mechanism, and the first laser cleaning mechanism and the second laser cleaning mechanism are arranged upstream and downstream on both sides of the conveying path of the battery cell pole piece. Therefore, the present application can ensure the accuracy and efficiency of double-sided cleaning of the battery cell pole piece during transportation through the coordinated work of various components.

[0099] The above are only partial or preferred embodiments of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A laser cleaning device for a battery cell pole piece, characterized in that: include: A conveying mechanism, used for conveying the battery cell pole pieces, wherein a cleaning station for cleaning the battery cell pole pieces is provided on the conveying path of the battery cell pole pieces; A laser cleaning mechanism is arranged at one side of the conveying path corresponding to the cleaning station, and is used to emit a first laser and a second laser, and make the first laser and the second laser perform a cleaning operation on the battery cell electrode piece in a pre-cleaning mode; Among them, slots to be cleaned are set on the battery cell pole piece, and the slots to be cleaned are cleaned layer by layer according to the pre-cleaning mode; the pre-cleaning mode includes a splicing cleaning mode and / or a chasing cleaning mode, and the splicing cleaning mode is that the first laser and the second laser work synchronously to jointly clean the same layer to be cleaned of the battery cell pole piece; the chasing cleaning mode is that when one of the first laser and the second laser cleans the upper layer to be cleaned to expose the lower layer to be cleaned adjacent thereto, the other laser chases the cleaning path of the upper layer to be cleaned to clean the lower layer to be cleaned.

2. The battery cell pole piece laser cleaning device according to claim 1, characterized in that: The laser cleaning mechanism includes a first laser, a second laser, a galvanometer assembly and a field lens. The first laser and the second laser are independent of each other and are both connected to the galvanometer assembly, and are respectively used to emit a first laser and a second laser to be incident on the galvanometer assembly. After the galvanometer assembly adjusts the direction of the light beam, the field lens focuses the first laser and the second laser on the battery cell electrode.

3. The battery cell pole piece laser cleaning device according to claim 2, characterized in that: The galvanometer assembly comprises a mounting seat, a first lens group and a second lens group; a cavity is formed in the mounting seat, and the first lens group and the second lens group are both arranged in the cavity; The first lens group is connected to the first laser, and the second lens group is connected to the second laser; the first lens group and the second lens group both include an adjustable X reflector and a Y reflector.

4. The battery cell pole piece laser cleaning device according to claim 3, characterized in that: It also includes a beam expander, wherein a first beam expander is arranged between the first laser and the first lens group, and a second beam expander is arranged between the second laser and the second lens group.

5. The battery cell pole piece laser cleaning device according to claim 1, characterized in that: Also includes: A negative pressure component, arranged at the other side of the conveying path corresponding to the cleaning station, for providing negative pressure to maintain the stability of the battery cell electrode sheet; A positioning component is arranged upstream of the laser cleaning mechanism along the conveying direction of the battery cell pole piece, and is used to locate the position of the battery cell pole piece so that the corresponding laser cleaning mechanism can perform a cleaning operation.

6. The battery cell pole piece laser cleaning device according to claim 5, characterized in that: It also includes a dust extraction component arranged corresponding to the cleaning station, and the dust extraction component is used to suck out dust particles generated during the cleaning operation of the battery cell pole piece.

7. The battery cell pole piece laser cleaning device according to claim 1, characterized in that: The laser cleaning mechanism is provided with two groups, including a first laser cleaning mechanism and a second laser cleaning mechanism. The first laser cleaning mechanism and the second laser cleaning mechanism are arranged upstream and downstream on both sides of the conveying path of the battery cell pole piece to clean the slots to be cleaned on both sides of the battery cell pole piece.

8. A method for laser cleaning of a battery cell pole piece, the cleaning method being used for the laser cleaning device according to any one of claims 1 to 7, characterized in that: include: The conveying mechanism conveys the battery cell pole pieces to the cleaning station; The laser cleaning mechanism emits a first laser and a second laser to clean the slots to be cleaned on the battery cell pole piece layer by layer in a pre-cleaning mode.

9. The method for laser cleaning of battery cell pole pieces according to claim 8, characterized in that: The battery cell pole piece laser cleaning method also includes: The conveying mechanism stops after conveying the cell electrode piece to the cleaning station, and the negative pressure component negatively absorbs the cell electrode piece to keep the cell electrode piece fixed; the laser cleaning mechanism emits the first laser and the second laser to clean the slots to be cleaned on the fixed cell electrode piece layer by layer in a pre-cleaning mode; or, The conveying mechanism conveys the battery cell pole pieces to the cleaning station, the negative pressure component negatively adsorbs the battery cell pole pieces to ensure that the battery cell pole pieces are conveyed smoothly, and the laser cleaning mechanism emits a first laser and a second laser to clean the slots to be cleaned on the continuously conveyed battery cell pole pieces layer by layer in a pre-cleaning mode.

10. The battery cell pole piece laser cleaning method according to claim 9, characterized in that: The battery cell pole piece laser cleaning method also includes: The conveying mechanism conveys the cell pole piece to the first cleaning station, and the first laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on one side of the cell pole piece layer by layer in a pre-cleaning mode; and The conveying mechanism continues to convey the battery cell pole piece to the second cleaning station, and the second laser cleaning mechanism emits the first laser and the second laser to clean the slot to be cleaned on the other side of the battery cell pole piece layer by layer in a pre-cleaning mode.

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