A spraying device for lithium battery separator

Abstract

The present invention discloses a spraying device for lithium battery diaphragms, which relates to the technical field of battery diaphragm spraying, and comprises a base and two groups of side frames arranged thereon, the base is provided with a swing spray mechanism for driving a spray pipe to swing back and forth in a fan-shaped trajectory above the diaphragm to spray the diaphragm, the swing spray mechanism comprises a transverse axis arranged between the two groups of side frames, a group of axial disks are coaxially fixed at both ends of the transverse axis, and a swing arm that can freely deflect in a vertical direction is provided below the axial disk, the swing arm rotates on a fixed axis on the side frame and is coaxially fixed with a lower axis; the present invention can drive the spray pipe to swing back and forth in a fan-shaped trajectory above the diaphragm by arranging the swing spray mechanism, so as to realize comprehensive spraying of the diaphragm, and the swing spray mechanism has a small movement amplitude and does not need to occupy a large space size, so that the spraying device can be flexibly arranged in a limited production site, saving space and reducing production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of battery diaphragm spraying, and in particular to a spraying device for lithium battery diaphragms. Background Art

[0002] Lithium batteries are widely used in numerous fields. Their performance and safety depend largely on the quality of their internal components, of which the battery separator is a key component. The primary function of a battery separator is to separate the positive and negative electrodes of the battery, preventing contact and short circuits. While allowing lithium ions to pass freely during charging and discharging, thus completing the battery's electrochemical reactions, the separator acts as a barrier.

[0003] Chinese patent (Announcement No.: CN116493180B), this solution specifically includes a main structure, a translation structure and a spraying structure. The translation structure is fixedly mounted on the main structure, and the spraying structure is fixedly mounted on the translation structure and is located above the main structure. The diaphragm can be fixed by a limiting component, and can be flipped 180 degrees for rotation in conjunction with the face-changing component, and then promoted for drying with the help of a drying component; the translation structure can drive the spraying structure to move, and with the help of the linkage of the nozzle in the spraying structure, a larger range can be directly sprayed, the spraying time can be shortened, and it can be adjusted according to the horizontal length of the spraying; the spraying structure can also be used to quickly achieve a large range of single uniform spraying and double uniform spraying, so that the overall spraying efficiency is improved.

[0004] The lithium battery diaphragm spraying device in the above-mentioned patent uses a translation structure to drive the movement of the nozzle to achieve comprehensive spraying of the diaphragm. However, in actual application, when the diaphragm size is large, the translation structure needs to move a long distance, which not only increases the space requirement of the device but also may lead to reduced spraying efficiency. In addition, in order to meet the movement range of the nozzle, the entire spraying device needs to occupy a large space, which brings many inconveniences to practical application when the production site is limited. Therefore, a spraying device for lithium battery diaphragms is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a spraying device for lithium battery diaphragms, which has the advantages of quickly covering a large area of ​​the diaphragm area without occupying a large space size, thereby solving the problem that the spraying device needs to occupy a large space.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a spraying device for lithium battery diaphragms, comprising a base and two sets of side frames mounted thereon, a spray pipe mounted on the side frames, and multiple sets of nozzles mounted on the spray pipe. The base is provided with an oscillating spray mechanism that drives the spray pipe to oscillate back and forth in a fan-shaped trajectory above the diaphragm to spray the diaphragm.

[0007] The swing spray mechanism includes a transverse shaft arranged between two sets of side frames, with both ends of the transverse shaft respectively fixedly rotating on one set of side frames, and a set of shaft disks coaxially fixed on both ends of the transverse shaft, and a swing arm freely deflecting in the vertical direction is provided below the shaft disk, the swing arm fixedly rotating on the side frames and coaxially fixed with a lower shaft, and the lower shaft is fixedly connected to the spray pipe;

[0008] The base is provided with a lifting component for adjusting the horizontal height of the side frame, and the side frame is provided with a speed changing component for adjusting the time taken by the swing rod to complete a single reciprocating swing cycle when its own height changes.

[0009] Preferably, a two-way connecting clamp is provided between the lower shaft and the spray pipe, and two sets of incomplete cavities integrally formed in the two-way connecting clamp are used to clamp and fix the lower shaft and the spray pipe respectively.

[0010] Preferably, the swing arm is in a vertical position in the initial state, and the nozzle fixed through the spray pipe is vertically downward.

[0011] Preferably, a positioning pin is fixedly connected to one end of the axial positioning disc facing the rocker arm, and a positioning groove for the positioning pin to be slidably connected is provided on the rocker arm.

[0012] Preferably, the speed change assembly includes a U-shaped bracket fixedly connected to the side frame, a spline shaft driven by a motor to rotate freely is fixedly rotated on the U-shaped bracket, a friction wheel is slidingly sleeved on the spline shaft, and the friction wheel moves freely along the laying direction of the spline shaft;

[0013] The fixed sleeve on the transverse shaft is provided with a tapered cylinder, which includes an integrally formed annular conical surface, and the annular conical surface is in friction contact with the friction wheel.

[0014] Preferably, the spline shaft and the annular cone surface are arranged in parallel on a vertical section.

[0015] Preferably, the U-shaped frame is provided with a freely rotatable threaded rod, and the threaded rod is fixedly rotated on the U-shaped frame, a seat is threadedly connected to the threaded rod, and a seat slot is provided on the U-shaped frame for sliding connection with the seat;

[0016] The same seat is provided with a clamping groove for accommodating the friction wheel, and the outer side surface of the friction wheel is in sliding contact with the inner wall of the clamping groove.

[0017] Preferably, the lifting assembly includes a driving shaft driven by a motor and freely rotating in the vertical direction, the driving shaft is fixedly rotated on the side frame, and the side frame is provided with a universal joint for transmission connection between the driving shaft and the threaded rod;

[0018] A worm is coaxially fixed on the driving shaft, the worm is meshed with a worm wheel, and the worm wheel is fixedly rotated on the side frame, the worm wheel is meshed with a bevel rack, and the bevel rack is fixedly connected to the base;

[0019] The base is provided with a turning slide groove for the side frame to slide vertically.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a swing spray mechanism, which can drive the spray pipe to swing back and forth in a fan-shaped trajectory above the diaphragm, thereby achieving comprehensive spraying of the diaphragm. This spraying method can quickly cover a large area of ​​the diaphragm area, significantly improving the spraying efficiency. The swing spray mechanism has a small movement amplitude and does not need to occupy a large space size. Therefore, the spraying device can be flexibly arranged in a limited production site, thereby achieving the purpose of saving space.

[0022] The present invention can adjust the swing speed of the spray pipe by setting a speed change component, thereby ensuring that the paint can be evenly covered on the diaphragm surface during the spraying process; especially when the spraying area increases, by appropriately reducing the spraying speed, the unevenness of the coating thickness is reduced, thereby improving the coating quality. The speed change component can dynamically adjust the swing speed of the spray pipe according to changes in the spraying range. This dynamic adjustment function enables the device to adapt to different spraying requirements, ensure the consistency of the spraying thickness, and further improve the uniformity of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the components of the U-shaped turning frame of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the components where the swing rod of the present invention is located;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 This is a schematic diagram of the components where the helical rack of the present invention is located;

[0029] Figure 7 This is a schematic diagram of the components where the bidirectional connection clamp ring of the present invention is located;

[0030] Figure 8 Schematic diagram of the relationship between the rotation angle of the positioning pin and the deflection of the rocker arm of the present invention;

[0031] Figure 9 This is a schematic diagram of the relationship between the deflection angle of the spray pipe and the spray length of the present invention.

[0032] In the figure: 1. Base; 2. Transverse shaft; 3. Tapered cylinder; 4. U-shaped turning frame; 5. Spline shaft; 6. Friction wheel; 7. Threaded rod; 8. Coordination seat; 9. Positioning groove; 10. Coordination slide; 11. Side frame; 12. Shaft positioning plate; 13. Locating pin; 14. Rocker arm; 15. Locating groove; 16. Lower shaft; 17. Two-way connecting snap ring; 18. Spray pipe; 19. Driving shaft; 20. Worm; 21. Worm wheel; 22. Bevel rack; 23. Turning slide. DETAILED DESCRIPTION

[0033] The following will provide a clear and complete description of 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figures 1 to 9 The present invention provides a technical solution: a spraying device for lithium battery diaphragms, comprising a base 1 and two sets of side frames 11 disposed thereon, a spray pipe 18 disposed on the side frames 11, and a plurality of nozzles disposed on the spray pipe 18. The base 1 is provided with a swing spray mechanism that drives the spray pipe 18 to swing back and forth in a fan-shaped trajectory above the diaphragm to perform a spraying operation on the diaphragm;

[0035] The swing spray mechanism includes a transverse shaft 2 arranged between two sets of side frames 11, with both ends of the transverse shaft 2 respectively rotating on a set of side frames 11, and a set of axis disks 12 coaxially fixed on both ends of the transverse shaft 2, and a swing rod 14 that can deflect freely in the vertical direction is provided below the axis disk 12, the swing rod 14 rotates on the side frames 11 and is coaxially fixed with a lower shaft 16, and the lower shaft 16 is fixedly connected to the spray pipe 18;

[0036] The base 1 is provided with a lifting assembly for adjusting the horizontal height of the side frame 11, and the side frame 11 is provided with a speed changing assembly for adjusting the time taken by the rocker 14 to complete a single reciprocating swing cycle when its own height changes.

[0037] like Figure 1 and Figure 4As shown, when the battery diaphragm is sprayed, the battery diaphragm to be sprayed is driven to the bottom of the spray pipe 18, and the center position of the spraying area is made to correspond to the spray pipe 18, wherein the rocker arm 14 is in a vertical state in the initial state, and the nozzles fixed through the spray pipe 18 are vertically downward. Therefore, by making the multiple groups of nozzles on the spray pipe 18 correspond to the center line position of the required spraying area in the initial state, it is ensured that there will be no problems of missed spraying and repeated spraying.

[0038] At the same time, when the axial position disk 12 rotates freely in the vertical direction, it can drive the two groups of axial position disks 12 set at its upper end to rotate synchronously, wherein the rotation process of the axial position disk 12 can drive the rocker arm 14 to deflect back and forth, and the lower shaft 16 is coaxially fixed on the rocker arm 14, thereby driving the lower shaft 16 to rotate back and forth in the vertical direction.

[0039] At the same time, a two-way connecting clamp 17 is provided between the lower shaft 16 and the spray pipe 18, and the two sets of incomplete cavities integrally formed in the two-way connecting clamp 17 are respectively used to clamp and fix the lower shaft 16 and the spray pipe 18. Therefore, when the lower shaft 16 rotates back and forth in the vertical direction, the two-way connecting clamp 17 can drive the spray pipe 18 to swing, that is, drive the nozzle provided on the spray pipe 18 to swing in a fan-shaped trajectory during the discharging process, so as to achieve the purpose of spraying the diaphragm.

[0040] At the same time, the horizontal height of the base 1 is changed by the lifting component, thereby changing the distance between the spray pipe 18 and the battery diaphragm in the initial state, so that when the spray pipe 18 swings back and forth, the range that the spray pipe 18 can cover on the battery diaphragm can be expanded, thereby increasing the spraying area of ​​the spray pipe 18.

[0041] Among them, in order to ensure the uniformity of spraying, the time required for the rocker arm 14 and the spray pipe 18 to complete a single reciprocating motion is changed by the speed change component, and then when the spraying area of ​​the battery diaphragm is increased, the spraying speed can be appropriately reduced to drive the paint to evenly cover the surface of the diaphragm, reduce the unevenness of the coating thickness, and achieve the purpose of improving the coating quality.

[0042] Furthermore, a positioning pin 13 is fixedly connected to one end of the axial positioning disc 12 facing the rocker arm 14 , and a positioning groove 15 for the positioning pin 13 to be slidably connected is formed on the rocker arm 14 .

[0043] like Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 and Figure 9As shown, when the transverse shaft 2 is freely rotating, it can drive the axial position disk 12 set at its end to rotate synchronously, and the positioning pin 13 fixed on the axial position disk 12 is slidably connected to the rocker arm 14 through the positioning groove 15. Then, when the axial position disk 12 drives the positioning pin 13 to rotate continuously, it can drive the rocker arm 14 to swing back and forth in the vertical direction, and then drive the spray pipe 18 to swing back and forth through the lower shaft 16 to complete the spraying operation on the battery diaphragm.

[0044] It should be noted that, as the positioning pin 13 continues to rotate and the speed remains unchanged, the change in the swing amplitude of the rocker arm 14 per unit time is determined by the displacement H of the positioning pin 13 in the horizontal direction, that is, when the positioning pin 13 rotates by a unit angle W, the displacement H of the positioning pin 13 in the horizontal direction is different, thereby driving the rocker arm 14 and the spray pipe 18 to swing back and forth, and their instantaneous swing speeds are different.

[0045] Among them, when the spray pipe 18 performs a single swinging motion and its swinging speed is consistent, that is, when the swinging angle of the spray pipe 18 per unit time is M, the spraying length N on the battery diaphragm is different, that is, when the angle between the spray pipe 18 and the perpendicular bisector gradually increases, the spraying length N on the battery diaphragm gradually increases during the swinging unit angle M.

[0046] Therefore, in order to ensure the uniformity of the battery separator coating, when the positioning pin 13 rotates with the axial disk 12, the horizontal displacement H of the positioning pin 13 gradually decreases when the unit angle W is rotated, thereby driving the rocker 14 to gradually increase the angle between the rocker 14 and the perpendicular bisector, and the instantaneous swing speed of the rocker 14 gradually decreases. Figure 9 In terms of the angle between the spray pipe 18 and the median perpendicular line, the swinging speed thereof gradually slows down, thereby driving the swinging angle of the spray pipe 18 per unit time to become smaller. At the same time, as the spray pipe 18 gradually moves away from the median perpendicular line, the spraying length N per unit angle M gradually increases. By gradually reducing the swinging speed of the spray pipe 18, the spray pipe 18 can be driven to coat the battery diaphragm relatively evenly during the reciprocating swing spraying process, thereby ensuring the uniformity of the coating. When the spray pipe 18 swings, the lower axis 16 is the center point of its swing, thereby causing the movement amplitude to be small and requiring no larger space size.

[0047] In one of the more preferred embodiments, the speed change assembly includes a U-shaped frame 4 fixedly connected to the side frame 11, a spline shaft 5 driven by a motor to rotate freely is fixedly rotated on the U-shaped frame 4, a friction wheel 6 is slidingly sleeved on the spline shaft 5, and the friction wheel 6 moves freely along the laying direction of the spline shaft 5;

[0048] A tapered cylinder 3 is fixedly sleeved on the transverse shaft 2. The tapered cylinder 3 includes an integrally formed annular conical surface. The annular conical surface is in frictional contact with the friction wheel 6. The spline shaft 5 and the annular conical surface are arranged in parallel on a vertical section.

[0049] The U-shaped frame 4 is provided with a freely rotatable threaded rod 7, and the threaded rod 7 is fixedly rotated on the U-shaped frame 4, the threaded rod 7 is threadedly connected to a position seat 8, and the U-shaped frame 4 is provided with a position slot 10 for sliding connection of the position seat 8;

[0050] The same seat 8 is provided with a retaining groove 9 for accommodating the friction wheel 6 , and the outer side surface of the friction wheel 6 is in sliding contact with the inner wall of the retaining groove 9 .

[0051] like Figure 1-Figure 3 As shown, motor No. 1 is fixed on the U-shaped frame 4, and the spline shaft 5 is driven by motor No. 1 to rotate freely, thereby driving the friction wheel 6 mounted thereon to rotate synchronously. The friction wheel 6 is in friction contact with the annular conical surface integrally formed in the conical cylinder 3, and when the friction wheel 6 rotates, it can drive the transverse shaft 2 to rotate freely in the vertical direction through the conical cylinder 3.

[0052] At the same time, when the transverse shaft 2 rotates, the shaft position disk 12 and the positioning pin 13 set at its end drive the rocker 14 to swing back and forth in the vertical direction, thereby driving the spray pipe 18 to swing back and forth in the vertical direction to complete the spraying operation of the battery diaphragm.

[0053] Among them, when the horizontal height of the side frame 11 changes, due to the fixed connection between the U-shaped frame 4 and the side frame 11, the horizontal height of the U-shaped frame 4 is driven to change synchronously. When the heights of the side frame 11 and the U-shaped frame 4 change, the threaded rod 7 can rotate freely on the U-shaped frame 4, thereby driving the same seat 8 that is threadedly matched with the U-shaped frame 4 to move along the laying direction of the U-shaped frame 4.

[0054] At the same time, the threaded rod 7, the spline shaft 5 and the annular conical surface are arranged in parallel on the vertical section, so that when the co-position seat 8 moves with the rotation of the threaded rod 7, the locking groove 9 opened thereon can push the friction wheel 6 to slide on the spline shaft 5, thereby changing the relative position between the friction wheel 6 and the annular conical surface.

[0055] It should be noted that, due to the different sizes of the annular cone surface at different sections, when the friction wheel 6 moves along the laying direction of the spline shaft 5, the circumference ratio of the friction wheel 6 and the corresponding conical cylinder 3 is different. When the U-shaped bracket 4 and the side bracket 11 move upward to raise the initial height of the spray pipe 18, the reciprocating swing amplitude of the spray pipe 18 in the vertical direction remains unchanged, and the increase in the distance between the spray pipe 18 and the battery diaphragm will drive the spraying range of the spray pipe 18 to increase. By dynamically adjusting the position of the friction wheel 6, the speed of the transverse shaft 2 can be adaptively adjusted when the speed of the spline shaft 5 remains unchanged, so as to ensure that the spray pipe 18 takes a longer time to complete a single swing cycle, thereby effectively ensuring the consistency of the spraying thickness while increasing the spraying range of the battery diaphragm, thereby further improving the spraying effect.

[0056] Based on the embodiment of the speed change assembly, the lifting assembly includes a drive shaft 19 driven by a motor and freely rotating in the vertical direction. The drive shaft 19 rotates on a fixed axis on the side frame 11, and the side frame 11 is provided with a universal joint for transmission connection between the drive shaft 19 and the threaded rod 7;

[0057] A worm 20 is coaxially fixed on the driving shaft 19, the worm 20 is meshed with a worm wheel 21, and the worm wheel 21 rotates on the side frame 11, the worm wheel 21 is meshed with a bevel rack 22, and the bevel rack 22 is fixedly connected to the base 1;

[0058] The base 1 is provided with a turning slide groove 23 for the side frame 11 to slide vertically.

[0059] like Figure 1 and Figure 6 As shown, the driving shaft 19 is driven to rotate in the vertical direction by the No. 2 motor fixed on the side frame 11. A worm 20 is fixed on the driving shaft 19, and the worm 20 is meshed with a worm gear 21, thereby driving the worm gear 21 to rotate freely on the side frame 11. At the same time, the worm gear 21 is meshed with a bevel rack 22, and the bevel rack 22 is fixed on the base 1. Therefore, when the driving shaft 19 rotates, the worm gear 21 can be driven to rotate synchronously, and the horizontal height of the worm gear 21 and the side frame 11 can be changed through the meshing relationship between the worm gear 21 and the bevel rack 22.

[0060] At the same time, the driving shaft 19 and the threaded rod 7 are connected through a universal joint, so that when the driving shaft 19 rotates to raise the horizontal height of the side frame 11, the circumference ratio between the friction wheel 6 and the corresponding position of the conical cylinder 3 can be increased through the rotation of the threaded rod 7, thereby reducing the rotation speed of the transverse shaft 2 when the rotation speed of the spline shaft 5 remains unchanged, and when it is necessary to spray the battery diaphragm in a larger range at a time, the time used by the spray pipe 18 in a single reciprocating cycle can be increased, thereby ensuring the consistency of the spray thickness and improving the spray quality.

[0061] It should be noted that the universal joint used to transmit the driving shaft 19 and the threaded rod 7 in this article is an existing device. The purpose of the universal joint is to drive the threaded rod 7 to rotate synchronously with the driving shaft 19, and to change the direction synchronously with the change of the direction of the driving shaft 19. At the same time, the universal joint is a technical means well known to those skilled in the art, so it is not shown in the figure.

[0062] 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 spraying device for lithium battery separators, comprising a base and two sets of side frames mounted thereon, a spray pipe mounted on the side frames, and multiple sets of nozzles mounted on the spray pipe, characterized in that: The base is provided with a swing spray mechanism which drives the spray pipe to swing back and forth in a fan-shaped trajectory above the diaphragm to spray the diaphragm; The swing spray mechanism includes a transverse shaft arranged between two sets of side frames, with both ends of the transverse shaft respectively fixedly rotating on one set of side frames, and a set of shaft disks coaxially fixed on both ends of the transverse shaft, and a swing arm freely deflecting in the vertical direction is provided below the shaft disk, the swing arm fixedly rotating on the side frames and coaxially fixed with a lower shaft, and the lower shaft is fixedly connected to the spray pipe; The base is provided with a lifting assembly for adjusting the horizontal height of the side frame, and the side frame is provided with a speed changing assembly for adjusting the time taken by the swing arm to complete a single reciprocating swing cycle when its own height changes; The speed change assembly includes a U-shaped bracket fixedly connected to the side frame, a spline shaft driven by a motor to rotate freely on the fixed axis of the U-shaped bracket, a friction wheel is provided on the sliding sleeve of the spline shaft, and the friction wheel moves freely along the laying direction of the spline shaft; The fixed sleeve on the transverse shaft is provided with a tapered cylinder, which includes an integrally formed annular conical surface, and the annular conical surface is in friction contact with the friction wheel; The U-shaped frame is provided with a freely rotatable threaded rod, and the threaded rod is fixedly rotated on the U-shaped frame, a seat is threadedly connected to the threaded rod, and a seat slot is provided on the U-shaped frame for sliding connection of the seat; The lifting assembly includes a driving shaft driven by a motor and freely rotating in the vertical direction. The driving shaft rotates on a fixed axis on a side frame, and a universal joint is provided on the side frame for transmission connection between the driving shaft and the threaded rod; A worm is coaxially fixed on the driving shaft, the worm is meshed with a worm wheel, and the worm wheel is fixedly rotated on the side frame, the worm wheel is meshed with a bevel rack, and the bevel rack is fixedly connected to the base.

2. A spraying device for lithium battery separator according to claim 1, characterized in that: A two-way connecting clamp is provided between the lower shaft and the spray pipe, and two groups of incomplete cavities integrally formed in the two-way connecting clamp are respectively used for clamping and fixing the lower shaft and the spray pipe.

3. The spraying device for lithium battery separator according to claim 1, characterized in that: The swing arm is in a vertical state in an initial state, and the nozzle fixed through the spray pipe is vertically downward.

4. A spraying device for lithium battery separator according to claim 3, characterized in that: A positioning pin is fixedly connected to one end of the axial position disc facing the rocker arm, and a positioning groove for the positioning pin to be slidably connected is provided on the rocker arm.

5. The spraying device for lithium battery separator according to claim 1, characterized in that: The spline shaft and the annular cone surface are both arranged in parallel on a vertical section.

6. The spraying device for lithium battery separator according to claim 5, characterized in that: The base is provided with a turning slide groove for the side frame to slide vertically.

7. The spraying device for lithium battery separator according to claim 6, characterized in that: The same seat is provided with a clamping groove for accommodating the friction wheel, and the outer side surface of the friction wheel is in sliding contact with the inner wall of the clamping groove.

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