Laser die cutting device for battery cell protective film of power battery

Abstract

The present invention relates to the technical field of laser die cutting for protective materials of power batteries, and in particular to a laser die cutting device for a battery cell protective film of a power battery, said device comprising: a machine box and a bearing plate inside of the machine box, a guide rail assembly being mounted inside of the bearing plate; a laser assembly arranged in the machine box, the laser assembly comprising a terminal part, the terminal part comprising an air blowing nozzle, and the terminal part being assembled on an output end of the guide rail assembly; and a calibration assembly, the calibration assembly being assembled on the terminal part, and the calibration assembly being capable of performing a coaxiality check on a light beam outputted by the terminal part and the air blowing nozzle. The present invention achieves high-quality laser die cutting for materials such as protective films and foam, and can also check the coaxiality between the light beam and the air blowing nozzle, thus improving the die cutting quality.

Description

A laser die-cutting device for power battery cell protective film Technical Field

[0001] The present invention relates to the technical field of laser die-cutting of power battery protective materials, and in particular to a laser die-cutting device for a power battery cell protective film. Background Art

[0002] Power battery cells need to have protective sheets attached to their outside, including foam, protective film, mica, PET sheets and double-sided tape. Most of these materials are soft and have heat-insulating properties.

[0003] In the existing technology, sheet materials such as protective film, foam, PET sheet and mica sheet are all formed by gradually cutting the roll material using die-cutting tools. However, the limitations of die-cutting tools, sheets and waste material handling, such as the adhesion of waste materials and the extensibility of soft sheets, will lead to reduced die-cutting efficiency. Technical issues

[0004] The present invention provides a laser die-cutting device for power battery cell protective films, which can realize high-quality laser die-cutting of materials such as protective films and foams, and can also verify the coaxiality of the light beam and the blowing nozzle, thereby improving the die-cutting quality. Technical Solutions

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A power battery cell protective film laser die-cutting device, comprising:

[0007] A chassis and a load-bearing plate therein, wherein a guide rail assembly is installed inside the load-bearing plate;

[0008] A laser assembly built into the chassis, the laser assembly including a terminal portion, the terminal portion including an air blowing nozzle;

[0009] The terminal portion is assembled on the output end of the guide rail assembly;

[0010] A proofreading component is assembled on the terminal part, and the proofreading component can verify the coaxiality of the light beam output by the terminal part and the blowing nozzle.

[0011] Optionally, the laser assembly further comprises a laser, a beam expander and three reflectors mounted on a carrier plate, one of the reflectors being mounted on a terminal portion, the terminal portion further comprising a focusing mirror mounted on the reflector, the air blowing nozzle being located at the output end of the focusing mirror, the beam expander being mounted between the laser and one of the reflectors, the remaining reflector serving as a transfer portion, and the laser light emitted by the laser passes through the beam expander, three reflectors, focusing mirror and air blowing nozzle in sequence.

[0012] Optionally, the guide rail assembly consists of an X-guide rail and two parallel Y-guide rails, the X-guide rail is electrically slidably mounted on top of the two Y-guide rails, an assembly block is fixedly mounted on the output end of the X-guide rail, and the terminal part is assembled on the assembly block.

[0013] Optionally, the proofreading assembly includes a tray that can be moved to just below the air blowing nozzle, a calibration box is rotatably installed on the top of the tray, a detection cavity is provided inside the calibration box, an optical channel is provided on the top of the calibration box, and the optical channel is coaxial with the air blowing nozzle, a laser power meter is installed in the detection cavity, a photosensitive sheet is rotatably installed inside the detection cavity between the laser power meter and the optical channel, a plurality of light-transmitting holes are provided on the photosensitive sheet, and the light-transmitting holes, the air blowing nozzle, the optical channel and the laser power meter are all coaxially designed.

[0014] Optionally, a limiting ring is provided for limiting rotation in the detection cavity, a worm gear groove is provided on the outer wall of the limiting ring, a worm gear meshing with the worm gear groove is installed for rotation in the detection cavity, one end of the worm gear passes through the calibration box, an embedding groove is provided on the annular inner wall of the limiting ring, the photosensitive sheet is placed inside the embedding groove, and shear nails are nailed between the limiting ring and the photosensitive sheet.

[0015] Optionally, an arc-shaped plate is fixedly installed on the top of the inspection box, and the arc-shaped plate is a semicircular structure. A sponge part is installed on the inner wall of the arc-shaped plate. An elastic part and a liquid supply part are also installed on the inner wall of the arc-shaped plate. The elastic part can form a pressing contact between the sponge part and the blowing nozzle, and the liquid supply part can provide cleaning alcohol to the sponge part.

[0016] Optionally, the elastic part includes a semi-annular constraint airbag, which has an outer ring constraint part and an inner ring extension part. A liquid storage tank is installed on the inner wall of the arc plate. The outer ring constraint part is fixedly connected to the liquid storage tank, and the inner ring extension part is fixedly connected to the outside of the sponge part. When the internal air pressure of the constraint airbag increases, it will expand and extend toward the sponge part, including an air source that can be injected into the interior of the constraint airbag.

[0017] Optionally, the liquid supply part includes cleaning alcohol filled in the interior of the liquid storage tank, the liquid storage tank is an L-shaped structure, the part of the liquid storage tank in contact with the inner ring extension part is designed with an extrusion part, part of the outer wall of the liquid storage tank is in contact with the sponge part, and a one-way needle is installed on the liquid storage tank, and the one-way needle is designed to flow into the sponge part in one direction. When the extrusion part is deformed, the alcohol inside the liquid storage tank will be injected into the sponge part through the one-way needle.

[0018] Optionally, a rotatable shaft passes through the tray, a driver that makes the shaft rotate at a uniform speed is fixedly installed on the bottom of the tray, an assembly plate is provided on the assembly block, a bracket is rotatably installed on the assembly plate, the bracket is fixedly connected to the tray, and when the bracket is rotated to a preset position, the light channel can be coaxial with the blowing nozzle.

[0019] Optionally, a material carrying plate is installed at the bottom of the carrying plate, a plurality of air holes are designed on the material carrying plate, and a controller for controlling the lifting of the carrying plate is installed inside the chassis. Beneficial effects

[0020] The present invention provides a laser die-cutting device for power battery cell protective film, which has the following beneficial effects:

[0021] 1. Through the cooperation of the guide rail assembly and the laser assembly, laser cutting can be applied to the die-cutting of protective films and foams, etc., improving the die-cutting quality and avoiding the problem of the die-cutting tool directly pressing on the cut surface and causing material deformation.

[0022] Second, through the coaxial design in which the light-transmitting hole, air blowing nozzle, optical channel and laser power meter are all coaxially designed, the point-shot light beam L will pass through the optical channel and the light-transmitting hole in sequence to reach the surface of the laser power meter. The laser power meter can detect the light beam L, thereby determining that the light beam L is coaxial with the center line of the air blowing nozzle; secondly, when the light beam L is not coaxial with the center line of the air blowing nozzle, the position of the light beam L and the light-transmitting hole is offset, which will cause the point-shot light beam L to be blocked by the photosensitive sheet, and the photosensitive sheet will form a light spot at the contact point after receiving the light beam L. At this time, it can be clearly determined that the light beam L is not coaxial with the center line of the air blowing nozzle and needs to be adjusted. At the same time, the position of the light spot can also be used as a guide for adjusting the position of the reflecting part.

[0023] 3. By designing the coordination of the arc plate, the sponge part and the elastic part, the outer wall of the sponge part can be fitted with the port of the blowing nozzle, so that the cleaning alcohol in the sponge part can infiltrate the port of the blowing nozzle. At the same time, the arc plate can be rotated on the top of the tray, so that the sponge part and the port of the blowing nozzle can be rubbed, so that substances such as slag can be processed, thereby achieving cleaning of the port of the blowing nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the external three-dimensional structure of the present invention;

[0025] FIG2 is a schematic structural diagram of the guide rail assembly and the laser assembly of the present invention;

[0026] FIG3 is a schematic diagram of the structure between the assembly block and the terminal portion of the present invention;

[0027] FIG4 is a schematic diagram of the three-dimensional structure of the terminal portion of the present invention;

[0028] FIG5 is a schematic internal cross-sectional view of the terminal portion of the present invention;

[0029] FIG6 is a schematic diagram of the three-dimensional structure of the proofreading component of the present invention;

[0030] FIG7 is a schematic diagram of the internal three-dimensional structure of the proofreading component of the present invention;

[0031] FIG8 is a schematic cross-sectional view of the interior of the proofreading assembly of the present invention;

[0032] FIG9 is a structural diagram of the restraining airbag, sponge portion and liquid storage tank of the present invention.

[0033] In the figure: 1. Chassis; 2. Carrying plate; 3. Y-guide rail; 4. Reflecting part; 5. Beam expander; 6. Laser; 7. Assembly block; 8. Assembly plate; 9. X-guide rail; 10. Focusing mirror; 11. Air blowing nozzle; 12. Curved plate; 13. Calibration box; 14. Bracket; 15. Tray; 16. Photosensitive film; 17. Limiting ring; 18. Light hole; 19. Laser power meter; 20. Worm; 21. Liquid storage tank; 22. Constraint airbag; 23. Sponge part; 24. One-way needle; 25. Carrying plate. Best Mode for Carrying Out the Invention

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Referring to Figures 1 to 9, the present invention provides a laser die-cutting device for a power battery cell protective film, comprising:

[0036] The chassis 1 and the carrier plate 2 inside it, the carrier plate 2 is installed with a guide rail assembly inside; the laser assembly built into the chassis 1, the laser assembly includes a terminal part, and the terminal part includes an air blowing nozzle 11; the terminal part is assembled on the output end of the guide rail assembly; the proofreading assembly, the proofreading assembly is assembled on the terminal part, and the proofreading assembly can verify the coaxiality of the light beam output by the terminal part and the air blowing nozzle 11.

[0037] In the prior art, when CNC tools cut protective films, foams, PET sheets, etc., the tools are often contaminated or interfered with, resulting in the inability to perform die-cutting production continuously, or during the production process, the quality of die-cutting will be affected by the material and the accuracy cannot be improved. In the present invention, laser die-cutting is applied to the cutting of materials such as protective films and foams, which can improve the die-cutting quality. Among them, this solution controls the displacement of the terminal part of the laser component by designing a guide rail assembly, thereby enabling die-cutting of materials such as protective films and foams. Secondly, due to mechanical vibration or long-term use of the guide rail assembly, the accuracy of laser die-cutting will be reduced and needs to be detected. Generally, this is caused by the misalignment between the light beam and the blow nozzle 11. This solution designs a proofreading component, which can verify the coaxiality of the light beam and the blow nozzle 11, thereby ensuring the die-cutting quality.

[0038] Among them, the more preferred embodiment is that the laser assembly also includes a laser 6, a beam expander 5 and three reflectors 4 mounted on the carrier plate 2, one of the reflectors 4 is assembled on the terminal part, the terminal part also includes a focusing mirror 10 mounted on the reflector 4, and the air blowing nozzle 11 is located at the output end of the focusing mirror 10. The beam expander 5 is assembled between the laser 6 and one of the reflectors 4, and the remaining reflector 4 serves as a transfer part. The laser light emitted by the laser 6 passes through the beam expander 5, the three reflectors 4, the focusing mirror 10 and the air blowing nozzle 11 in sequence, please refer to Figures 2 to 4. In this embodiment, the light beam emitted by the laser 6 will be reflected by the first two reflectors 4 in sequence to reach the last reflector 4, and then focused by the focusing mirror 10 to achieve laser cutting. In this process, the light beam will pass through the beam expander 5 after being emitted from the laser 6 to expand the light beam. The reflection outlet of the reflector 4 assembled on the terminal part is vertically downward, so that the final focused light beam can die-cut the protective film or foam below.

[0039] Based on the laser assembly embodiment, the guide rail assembly consists of an X-guide rail 9 and two parallel Y-guide rails 3. The X-guide rail 9 is electrically slidably mounted on the top of the two Y-guide rails 3. The output end of the X-guide rail 9 is fixedly mounted with an assembly block 7, and the terminal portion is assembled on the assembly block 7. Please refer to Figure 2. In this embodiment, the two Y-guide rails 3 can control the displacement of the X-guide rail 9 in the Y direction, and the X-guide rail 9 can control the displacement of the assembly block 7 and the terminal portion in the X direction, so that two-dimensional die-cutting of materials such as protective films or foams can be performed.

[0040] Among them, the more preferred embodiment is that the proofreading component includes a tray 15 that can be moved to the bottom of the air blowing nozzle 11, and a calibration box 13 is rotatably installed on the top of the tray 15. A detection cavity is provided inside the calibration box 13, and an optical channel is provided on the top of the calibration box 13. At this time, the optical channel is coaxial with the air blowing nozzle 11, and a laser power meter 19 is installed in the detection cavity. A photosensitive sheet 16 is rotatably installed inside the detection cavity between the laser power meter 19 and the optical channel, and a plurality of light-transmitting holes 18 are provided on the photosensitive sheet 16. The light-transmitting holes 18, the air blowing nozzle 11, the optical channel and the laser power meter 19 are all coaxially designed.

[0041] Please refer to Figures 2 to 8. In this embodiment, under normal conditions, the light beam focused from the focusing lens 10 is maintained on the central axis of the blowing nozzle 11. In order to improve the blowing effect of the blowing nozzle 11, the blowing nozzle 11 is designed to be conical. The main function of the blowing nozzle 11 is to gather auxiliary gas and form high pressure, which is released to the surface of the cutting material and the kerf, blowing away the melted and vaporized base material generated during the cutting process, leaving a clean kerf. Secondly, the high-speed gas can also prevent slag or polluted smoke from rebounding, which can protect the focusing lens 10. Therefore, the light beam needs to be coaxial with the center line of the air blowing nozzle 11 to ensure the quality of the cut seam. If the light beam is not coaxial with the center line of the air blowing nozzle 11, the position of the cut seam will be offset, resulting in reduced blowing quality, and then the quality of the cut seam section will be reduced. The slag, parent material or polluted smoke generated during cutting will also gradually adhere to the port of the air blowing nozzle 11, causing the light beam to pass through. More seriously, it affects the cutting quality and also causes damage to the air blowing nozzle 11. Therefore, in this embodiment, by designing the proofreading component, the cutting quality can be improved in unit time or unit time. Within the batch, it is necessary to verify the coaxiality of the blowing nozzle 11 and the light beam. Please refer to Figure 5. L is the vertical trajectory of the normal light beam. When verifying the light beam L, it is necessary to set the laser 6 to the point-shooting state and reduce the power of the laser beam. When the light beam L is coaxial with the center line of the blowing nozzle 11, since the light hole 18, the blowing nozzle 11, the optical channel and the laser power meter 19 are all coaxially designed, the point-shooting light beam L will pass through the optical channel and the light hole 18 in turn to reach the surface of the laser power meter 19. The laser power meter 19 can detect the light beam L, thereby Make sure that the light beam L is coaxial with the center line of the blowing nozzle 11; however, when the light beam L is not coaxial with the center line of the blowing nozzle 11, the position of the light beam L and the light-transmitting hole 18 is offset, which will cause the point-shot light beam L to be blocked by the photosensitive sheet 16, and the photosensitive sheet 16 will form a light spot at the contact point after receiving the light beam L. At this time, it can be clearly seen that the light beam L is not coaxial with the center line of the blowing nozzle 11 and needs to be adjusted. At the same time, the formation position of the light spot can also be used as a guide for adjusting the position of the reflecting part 4, which is more useful for staff to calibrate the reflecting part 4.

[0042] Secondly, due to the design of multiple light-transmitting holes 18, verification can be performed again by simply rotating the photosensitive sheet 16, thereby ensuring the quality of verification.

[0043] On the basis of the proofreading component embodiment, a limit ring 17 is provided for limiting the rotation in the detection cavity. A worm gear groove is provided on the outer wall of the limit ring 17. A worm 20 meshing with the worm gear groove is installed for rotation in the detection cavity. One end of the worm 20 passes through the calibration box 13. An embedding groove is provided on the annular inner wall of the limit ring 17. The photosensitive sheet 16 is placed inside the embedding groove, and shear nails are nailed between the limit ring 17 and the photosensitive sheet 16. Please refer to Figures 6 to 9. By designing the cooperation between the worm gear groove and the worm gear 20, the rotation of the limit ring 17 can be adjusted externally, thereby controlling the rotation of the photosensitive sheet 16, improving the utilization rate of the photosensitive sheet 16, and reducing the number of times the photosensitive sheet 16 is replaced. At the same time, the worm gear groove and the worm gear 20 have a self-locking feature, which can improve accuracy. For more convenient use, a scale can be designed on the outer wall of the calibration box 13, which is more helpful to adjust the position of the light-transmitting hole 18 so that it can be coaxial and collinear with the center line of the blowing nozzle 11.

[0044] On the basis of the embodiment of the proofreading assembly, an arc-shaped plate 12 is fixedly installed on the top of the proofreading box 13. The arc-shaped plate 12 is a semicircular structure. A sponge portion 23 is installed on the inner wall of the arc-shaped plate 12. An elastic portion and a liquid supply portion are also installed on the inner wall of the arc-shaped plate 12. The elastic portion can make the sponge portion 23 form a pressing contact with the blowing nozzle 11, and the liquid supply portion can provide cleaning alcohol to the sponge portion 23. Please refer to Figures 5 to 9. In this embodiment, when the light beam is not coaxial with the center line of the blowing nozzle 11, smoke or slag may gradually accumulate at the port of the blowing nozzle 11, causing the port of the blowing nozzle 11 to affect the light. The port of the air blowing nozzle 11 may also be deformed or stuck with slag due to the normal path of the beam. Therefore, by designing the coordination of the arc plate 12, the sponge portion 23 and the elastic portion, the outer wall of the sponge portion 23 can be fitted with the port of the air blowing nozzle 11, so that the cleaning alcohol in the sponge portion 23 can infiltrate the port of the air blowing nozzle 11. At the same time, the arc plate 12 can be rotated on the top of the tray 15, so that the sponge portion 23 can rub against the port of the air blowing nozzle 11, so that the slag and other substances can be processed, thereby achieving the cleaning treatment of the port of the air blowing nozzle 11.

[0045] Furthermore, the elastic portion includes a semi-annular constraint airbag 22, which has an outer ring constraint portion and an inner ring extension portion. A liquid storage tank 21 is installed on the inner wall of the arc plate 12. The outer ring constraint portion is fixedly connected to the liquid storage tank 21, and the inner ring extension portion is fixedly connected to the outside of the sponge portion 23. When the internal air pressure of the constraint airbag 22 increases, it will expand and extend toward the sponge portion 23, including an air source that can be injected into the interior of the constraint airbag 22. Please refer to Figures 7 to 9. In this embodiment, when cleaning is required, the air source is started to inject gas into the interior of the constraint airbag 22. Since the outer ring constraint portion has an impact on the constraint airbag, the air source is activated to inject gas into the interior of the constraint airbag. Due to the restriction of 22, the inner ring extension part of the restraint airbag 22 can only expand and extend inward. During its expansion process, the restraint airbag 22 will apply pressure in the direction of the sponge part 23, so that the outer wall of the sponge part 23 can be pressure-fitted with the port of the blowing nozzle 11. At the same time, the characteristics of the sponge part 23 will cause the alcohol inside the sponge part 23 to be squeezed out, so as to better infiltrate the slag and other substances on the outer wall of the blowing nozzle 11, so as to better clean it. Secondly, when the sponge part 23 is squeezed in one direction, it will be able to extend to the port opening, and the cleaning will be more comprehensive.

[0046] Furthermore, the liquid supply portion includes cleaning alcohol filled in the liquid storage tank 21. The liquid storage tank 21 is an L-shaped structure. The portion of the liquid storage tank 21 that contacts the inner ring extension portion is designed with an extrusion portion. Part of the outer wall of the liquid storage tank 21 contacts the sponge portion 23. A one-way needle 24 is installed on the liquid storage tank 21. The one-way needle 24 is designed to flow into the sponge portion 23 in one direction. When the extrusion portion is deformed, the alcohol inside the liquid storage tank 21 will be injected into the sponge portion 23 through the one-way needle 24. Please refer to Figure 8 and its detailed enlarged view. In this embodiment, when the extrusion portion is deformed, the liquid inside the liquid storage tank 21 will be squeezed, so that the liquid inside the liquid storage tank 21 is injected into the interior of the sponge portion 23 under the guidance and restriction of the one-way needle 24, thereby replenishing the sponge portion 23 with cleaning alcohol.

[0047] Furthermore, a rotatable shaft passes through the tray 15, and a driver that makes the shaft rotate at a uniform speed is fixedly installed on the bottom of the tray 15. An assembly plate 8 is provided on the assembly block 7, and a bracket 14 is rotatably installed on the assembly plate 8. The bracket 14 is fixedly connected to the tray 15. When the bracket 14 is rotated to a preset position, the light channel can be coaxial with the blowing nozzle 11. In this embodiment, the preset position means that the photosensitive film 16 can be perpendicular to the light beam, and the light-transmitting hole 18 and the light channel can be coaxial with the center line of the blowing nozzle 11.

[0048] Furthermore, a material carrier plate 25 is installed at the bottom of the carrier plate 2 , and a plurality of air holes are designed on the material carrier plate 25 . A controller for controlling the lifting of the carrier plate 2 is installed inside the chassis 1 .

[0049] By utilizing the above structure, the laser die-cutting of materials such as protective films and foams can be realized, and the coaxiality between the light beam and the blowing nozzle 11 can be verified, thereby improving the die-cutting quality. Modes for Carrying Out the Invention

[0050] Type here a paragraph describing embodiments of the invention. Industrial Applicability

[0051] Type your industrial applicability description paragraph here. Sequence Listing Free Content

[0052] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be processed without any doubt based on existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description will be given here.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A laser die-cutting device for a power battery cell protective film, characterized in that: It includes: A chassis (1) and a carrier plate (2) inside it, and a guide rail assembly is installed inside the carrier plate (2); A laser assembly built in the chassis (1), the laser assembly includes a terminal part, and the terminal part includes a blowing nozzle (11); The terminal part is assembled on the output end of the guide rail assembly; A calibration assembly, the calibration assembly is assembled on the terminal part, and the calibration assembly can perform coaxial verification on the light beam output by the terminal part and the blowing nozzle (11).

2. The laser die-cutting device for a power battery cell protective film according to claim 1, characterized in that: The laser assembly further includes a laser (6), a beam expander part (5) and three reflection parts (4) installed on the carrier plate (2). One of the reflection parts (4) is assembled on the terminal part. The terminal part further includes a focusing lens (10) installed on the reflection part (4). The blowing nozzle (11) is located at the output end of the focusing lens (10). The beam expander part (5) is assembled between the laser (6) and one of the reflection parts (4). The remaining one of the reflection parts (4) serves as a transfer part. The laser emitted by the laser (6) sequentially passes through the beam expander part (5), the three reflection parts (4), the focusing lens (10) and the blowing nozzle (11).

3. The laser die-cutting device for a power battery cell protective film according to claim 2, characterized in that: The guide rail assembly is composed of an X-direction guide rail (9) and two parallel Y-direction guide rails (3). The X-direction guide rail (9) is electrically controlled and slidably installed on the tops of the two Y-direction guide rails (3). An assembly block (7) is fixedly installed at the output end of the X-direction guide rail (9). The terminal part is assembled on the assembly block (7).

4. The laser die-cutting device for a power battery cell protective film according to claim 3, characterized in that: The calibration assembly includes a tray (15) that can move to directly below the blowing nozzle (11). A calibration box (13) is rotatably installed on the top of the tray (15). A detection cavity is opened inside the calibration box (13). An optical channel is opened on the top of the calibration box (13). At this time, the optical channel is coaxial with the blowing nozzle (11). A laser power meter (19) is installed inside the detection cavity. A photosensitive sheet (16) is rotatably installed inside the detection cavity between the laser power meter (19) and the optical channel. A plurality of light transmission holes (18) are opened on the photosensitive sheet (16). The light transmission holes (18), the blowing nozzle (11), the optical channel and the laser power meter (19) are all designed coaxially.

5. The laser die-cutting device for a power battery cell protective film according to claim 4, characterized in that: A limiting ring (17) is rotationally limited inside the detection cavity. A worm gear groove is opened on the outer wall of the limiting ring (17). A worm (20) that meshes with the worm gear groove is rotatably installed inside the detection cavity. One end of the worm (20) penetrates out of the calibration box (13). An embedding groove is opened on the annular inner wall of the limiting ring (17). The photosensitive sheet (16) is placed inside the embedding groove, and a shear pin is nailed between the limiting ring (17) and the photosensitive sheet (16).

6. The laser die-cutting equipment for the power battery cell protection film according to claim 4, characterized in that: An arc-shaped plate (12) is fixedly installed on the top of the calibration box (13). The arc-shaped plate (12) is of a semi-circular structure. A sponge part (23) is installed on the inner wall of the arc-shaped plate (12). An elastic part and a liquid supply part are also installed on the inner wall of the arc-shaped plate (12). The elastic part can make the sponge part (23) form a pressing contact with the air blowing nozzle (11). The liquid supply part can provide cleaning alcohol to the sponge part (23).

7. The laser die-cutting equipment for the power battery cell protection film according to claim 6, characterized in that: The elastic part includes a semi-circular restraint airbag (22). The restraint airbag (22) has an outer ring restraint part and an inner ring extension part. A liquid storage tank (21) is installed on the inner wall of the arc-shaped plate (12). The outer ring restraint part is fixedly connected to the liquid storage tank (21). The inner ring extension part is fixedly connected to the outside of the sponge part (23). When the air pressure inside the restraint airbag (22) increases, it will expand and extend towards the sponge part (23), including a gas source that can be injected into the restraint airbag (22).

8. The laser die-cutting equipment for the power battery cell protection film according to claim 7, characterized in that: The liquid supply part includes cleaning alcohol filled inside the liquid storage tank (21). The liquid storage tank (21) is of an L-shaped structure. A squeezing part is designed at the part of the liquid storage tank (21) that contacts the inner ring extension part. A part of the outer wall of the liquid storage tank (21) is in contact with the sponge part (23). A one-way needle (24) is installed on the liquid storage tank (21). The one-way needle (24) is designed to flow into the sponge part (23) unidirectionally. When the squeezing part deforms, it will cause the alcohol inside the liquid storage tank (21) to be injected into the sponge part (23) through the one-way needle (24).

9. The laser die-cutting equipment for the power battery cell protection film according to claim 4, characterized in that: A rotatable rotating shaft penetrates through the tray (15). A driver for making the rotating shaft rotate at a constant speed is fixedly installed at the bottom of the tray (15). An assembly plate (8) is arranged on the assembly block (7). A bracket (14) is rotatably installed on the assembly plate (8). The bracket (14) is fixedly connected to the tray (15). When the bracket (14) rotates to a preset position, it can make the light channel coaxial with the air blowing nozzle (11).

10. The laser die-cutting equipment for the power battery cell protection film according to any one of claims 1-9, characterized in that: A loading plate (25) is installed at the bottom of the bearing plate (2). A plurality of air holes are designed on the loading plate (25). A controller for controlling the lifting of the bearing plate (2) is installed inside the chassis (1).

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