A gap coating machine for lithium battery production

Abstract

The present invention relates to the technical field of coating machines, and in particular to a gap coating machine for lithium battery production, wherein a reeling mechanism, a connecting assembly, an upper tensioning roller, a buffer assembly and a coating die are arranged in sequence along the conveying direction of a foil strip; the buffer assembly comprises a horizontal sliding seat assembly and two buffer material rollers; two connecting rods are hinged on the horizontal sliding seat assembly; the two connecting rods are respectively hinged on the lifting sliding seats of the two buffer material rollers; the sliding seat body is slidably connected to a horizontal guide rail; the two connecting rods are symmetrically arranged on the upper and lower sides of the horizontal guide rail; a counterweight is arranged on a lifting sliding seat on the lower side of the horizontal guide rail. When the present invention is used, the deformation of the foil strip caused by excessive stretching can be reduced, and the present invention can be applied to coating of more types of foil strips and reduce the instantaneous impact force on the foil strip.

Description

Technical Field

[0001] The invention relates to the technical field of coating machines, and in particular to a gap coating machine for lithium battery production. Background Art

[0002] The gap coater is one of the important equipment for the production of lithium battery electrodes. Its working principle is: the foil strip is transported to the coating die through the unwinding mechanism and the tensioning mechanism, and the slurry is intermittently coated on the surface of the foil strip, and finally the foil strip is formed into multiple electrode sheets.

[0003] In order to allow the coating machine to work non-stop, at least two unwinding mechanisms for unwinding the foil strip are usually provided on the coating machine. That is, after the foil strip of the first unwinding mechanism is used up, the end of the foil strip of the first unwinding mechanism is connected to the front end of the foil strip of the second unwinding mechanism through a connecting device, so that the coating machine can be used continuously without stopping.

[0004] When the foil strip is connected, the tension of the foil strip needs to be maintained, so a buffer mechanism for buffering the foil strip needs to be set behind the foil strip connection position. At the same time, in order to facilitate the adjustment of the tension of the foil strip entering and exiting the buffer mechanism, a tension wheel assembly is set at the front and rear positions of the buffer mechanism. The existing buffer mechanism is usually composed of a roller that can move up and down; its principle is to rely on the roller's own gravity to generate pressure on the foil strip.

[0005] Since the end of the foil strip of the first unwinding mechanism is clamped and fixed and cannot move forward, the tension of the foil strip will continue to increase. Therefore, the foil strip must overcome the gravity of the roller and lift the roller upward before the foil strip stored on the cache mechanism can be pulled out. After the connection is completed, the connection mechanism releases the clamping of the foil strip, the tension of the foil strip decreases, and the gravity of the roller on the cache mechanism overcomes the thrust of the foil strip and descends, and the foil strip is cached again. It can be seen that this cache mechanism has the following defects:

[0006] 1. During use, the pressure of the roller on the buffer mechanism on the foil strip is greater than or equal to the weight of the roller itself, that is, the lower limit of the pressure of the roller on the foil strip is at least the weight of the roller itself; therefore, the tension on the foil strip is too large, and some soft or thin foil strips are prone to being pulled and deformed during the connection of the foil strip.

[0007] 2. After the foil strip is connected, the moment the connection mechanism releases the clamping force, the foil strip on the unwinding mechanism will be pulled violently due to the tension difference between the buffer mechanism and the unwinding mechanism. This phenomenon will not only easily break or tear the weakest welding joint, but also accelerate the unwinding of the material roll on the unwinding mechanism, and cause the foil strip between the buffer mechanism and the unwinding mechanism to be partially relaxed, resulting in unstable movement of the foil strip and affecting the coating effect.

[0008] Therefore, it is necessary to make further technical innovations to the cache structure of the existing coating machine. Summary of the invention

[0009] The purpose of the present invention is to provide a gap coating machine for lithium battery production in view of the defects and shortcomings of the prior art.

[0010] To achieve the above object, the technical solution adopted by the present invention is:

[0011] The gap coating machine for lithium battery production of the present invention comprises a frame; the frame is provided with an upper tensioning roller, a docking assembly, a buffer assembly, a coating die head and two unwinding mechanisms; the unwinding mechanism, the docking assembly, the upper tensioning roller, the buffer assembly and the coating die head are arranged in sequence along the conveying direction of the foil strip;

[0012] The buffer assembly includes a horizontal sliding seat assembly and two buffer material rollers; both ends of the buffer material rollers are rotatably connected to a lifting sliding seat;

[0013] The lifting sliding seat is connected to the frame in a lifting and sliding manner; two connecting rods are hinged on the horizontal sliding seat assembly; the two connecting rods are respectively hinged on the lifting sliding seats of the two buffer material rollers; the horizontal sliding seat assembly includes a sliding seat body and a horizontal guide rail fixed to the frame; the sliding seat body is slidably connected to the horizontal guide rail; the two connecting rods are symmetrically arranged on the upper and lower sides of the horizontal guide rail; a counterweight is arranged on a lifting sliding seat on the lower side of the horizontal guide rail.

[0014] Furthermore, a horizontal sliding block slidably connected to the horizontal guide rail is fixed on the sliding seat body;

[0015] The sliding seat body is provided with a guide groove; a screw rod is slidably connected in the guide groove; a roller connecting seat is fixed to the bottom end of the screw rod; a one-way bearing is provided on the roller connecting seat; the outer ring of the one-way bearing is fixed on the roller connecting seat; a friction wheel is fixed to the inner ring of the one-way bearing; the wheel body of the friction wheel is tightly against the frame; a retaining ring is fixed on the screw rod;

[0016] A first nut is threadedly connected between the roller connecting seat and the sliding seat body; a spring is connected between the retaining ring and the first nut;

[0017] The screw rod is threadedly connected with a limiting nut at one end away from the roller connecting seat.

[0018] Furthermore, a pad is fixed on the frame; a wedge-shaped surface is provided at one end of the pad; and the wheel body of the friction wheel is tightly against the pad.

[0019] Furthermore, a fixed shaft is fixed on the roller connecting seat; a support wheel is rotatably connected to the fixed shaft; and a horizontal height of the bottom end of the support wheel is lower than a horizontal height of the bottom end of the friction wheel.

[0020] Furthermore, the counterweight is a water tank; a water inlet is provided at the top of the water tank; and a drain valve is provided at the bottom of the water tank.

[0021] Furthermore, the docking assembly includes two symmetrically arranged film pressing modules; the film pressing module includes a film clamping assembly, a cutting assembly, a fixed plate fixed on a frame, a sliding sleeve fixed on the fixed plate, a cylinder fixed at one end on the fixed plate and a movable plate fixed at the other end of the cylinder; a sliding shaft slidably connected to the sliding sleeve is fixed on the movable plate; a clamping plate is fixed on the sliding shaft; a welding machine assembly is arranged on the clamping plate; the clamping plate, the cutting assembly and the film clamping assembly are arranged along the conveying direction of the foil strip.

[0022] Furthermore, the film clamping assembly is two mutually parallel pinch rollers.

[0023] Furthermore, the outer sleeve of the clamping assembly is provided with a waste box fixed on the frame; the front surface of the waste box is provided with a front opening; the clamping roller is arranged in the front opening of the waste box; and the top of the waste box is provided with a discharge port.

[0024] Furthermore, the cutting assembly includes a linear module; the linear module is fixed on a frame; and a cutter is connected to the linear module.

[0025] The beneficial effects of the present invention are:

[0026] 1. During the splicing of the foil strip, the tension force on the foil strip is not affected by the gravity of the buffer roller, which can reduce the deformation of the foil strip due to excessive stretching and further ensure the splicing quality of the foil strip;

[0027] 2. No need to consider the influence of the gravity of the buffer roller, different counterweights can be matched according to the tensile strength of different foil strips, and it can be applied to more types of foil strip coating;

[0028] 3. Two symmetrically arranged connecting rods are used to realize synchronous movement of the upper and lower buffer rollers, synchronously buffer and release the foil strip, and reduce the stroke of a single buffer roller. In addition to improving the efficiency of material storage, it can reduce the lifting speed of the buffer roller during material storage and reduce the acceleration of the buffer roller during the start of lifting, thereby reducing the instantaneous impact force on the foil strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a first perspective stereogram of the present invention;

[0030] Figure 2 is a second viewing angle stereogram of the present invention;

[0031] Figure 3 It is a front view of the present invention;

[0032] Figure 4 is a three-dimensional diagram of the lamination module;

[0033] Figure 5 is a first-perspective stereogram of the connection of the buffer roller, connecting rod and horizontal sliding seat assembly;

[0034] Figure 6 is a second perspective view of the connection between the buffer roller, the connecting rod and the horizontal sliding seat assembly;

[0035] Figure 7 This is a structural diagram of the horizontal sliding seat assembly and the pad in the state where the material storage is completed;

[0036] Figure 8 is a first perspective stereogram of the horizontal sliding seat assembly;

[0037] Fig. 9 is a second perspective stereogram of the horizontal sliding seat assembly;

[0038] Description of reference numerals:

[0039] 10. Unwinding mechanism;

[0040] 20, laminating module; 201, waste box; 20101, discharge port; 202, pinch roller;

[0041] 203, welding machine assembly; 204, linear module; 205, cutter; 206, clamping plate; 20601, through hole;

[0042] 207, fixed plate; 208, cylinder; 209, sliding sleeve; 2010, sliding shaft; 2011, movable plate;

[0043] 30. Connecting rod; 40. Upper tensioning roller; 50. Frame;

[0044] 60. Buffer material roller; 601. Lifting sliding seat; 602. Lifting slider; 603. Lifting guide rail;

[0045] 70, coating die head; 80, pad; 801, wedge-shaped surface;

[0046] 90. Horizontal sliding seat assembly; 901. Screw rod; 902. Limit nut; 90201. Retaining ring;

[0047] 903, sliding seat body; 90301, guide groove; 904, first nut; 905, spring;

[0048] 906, friction wheel; 907, one-way bearing; 908, roller connecting seat; 909, horizontal guide rail;

[0049] 9010, horizontal slider; 9011, support wheel; 9012, fixed shaft;

[0050] 100. Counterweight; 1001. Water inlet; 1002. Drain valve. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] like Figures 1 to 9 As shown, a gap coating machine for lithium battery production described in the present invention includes a frame 50; an upper tensioning roller 40, a docking assembly, a cache assembly, a coating die 70 and two unwinding mechanisms 10 are arranged on the frame 50; the unwinding mechanism 10, the docking assembly, the upper tensioning roller 40, the cache assembly and the coating die 70 are arranged in sequence along the conveying direction of the foil strip.

[0053] The buffer assembly includes a horizontal sliding seat assembly 90 and two buffer material rollers 60; both ends of the buffer material rollers 60 are rotatably connected to a lifting sliding seat 601.

[0054] The lifting sliding seat 601 is connected to the frame 50 in a lifting and sliding manner; two connecting rods 30 are hinged on the horizontal sliding seat assembly 90; the two connecting rods 30 are respectively hinged on the lifting sliding seats 601 of the two buffer rollers 60; the horizontal sliding seat assembly 90 includes a sliding seat body 903 and a horizontal guide rail 909 fixed on the frame 50; the sliding seat body 903 is slidably connected to the horizontal guide rail 909; the two connecting rods 30 are symmetrically arranged on the upper and lower sides of the horizontal guide rail 909; a counterweight 100 is arranged on a lifting sliding seat 601 on the lower side of the horizontal guide rail 909.

[0055] The counterweight 100 is connected between the lifting sliding seat 601 and the connecting rod 30, the counterweight 100 is fixed on the lifting sliding seat 601, and the connecting rod 30 is hinged on the counterweight 100; through the transition connection between the counterweight 100, the hinge point between the connecting rod 30 and the upper lifting sliding seat 601 and the connection point between the connecting rod 30 and the counterweight 100 are on the same vertical line; ensuring that the two connecting rods 30 move symmetrically; and blocks are provided at the front and rear ends of the horizontal guide rail 909 to prevent the sliding seat body 903 from sliding out of the guide rail.

[0056] A lifting slider 602 is fixed on the lifting sliding seat 601; a lifting guide rail 603 slidably connected to the lifting slider 602 is fixed on the frame 50; the coating die head 70 and the unwinding mechanism 10 are essentially the same as those in the prior art, so they are not described in detail; the two connecting rods 30 are hinged on the sliding seat body 903.

[0057] After the spare material roll passes through the connecting assembly, the end of the foil strip is clamped and fixed; after the other material roll is unwound from the unwinding mechanism 10, it passes through the connecting assembly, the upper tensioning roller 40, the buffer assembly and is coated by the coating die 70. When the material roll is about to run out, the sensor generates a signal, and the connecting assembly clamps the two foil strips together and welds them together; when the foil strips are clamped, the cutting assembly cuts off the end of the new material; after welding, the connecting assembly releases the clamping of the foil strip.

[0058] Since the horizontal sliding seat assembly 90 can only slide in the horizontal direction, and the two connecting rods 30 are symmetrically arranged in the upper and lower directions; the upper buffer material roller 60 generates a thrust on the connecting rod 30 due to its own gravity, and the lower buffer material roller 60 generates a pulling force on the connecting rod 30 due to its own gravity, and the two forces are equal in magnitude and act on the sliding seat body 903 at the same time; the horizontal component of the thrust generated by the upper buffer material roller 60 on the connecting rod 30 is the same in magnitude and opposite in direction as the horizontal component of the pulling force generated by the upper buffer material roller 60 on the connecting rod 30, and a balanced state is reached; therefore, the gravity of the buffer material roller 60 itself will not tension the foil strip; and the tension required by the foil strip itself is only affected by the gravity of the counterweight 100 itself, so the weight of different counterweights 100 can be selected according to the required tension of the foil strip, which is more flexible to use.

[0059] As a preferred embodiment of the present invention, a horizontal sliding block 9010 slidably connected to the horizontal guide rail 909 is fixed on the sliding seat body 903 .

[0060] A guide groove 90301 is provided in the sliding seat body 903; a screw rod 901 is slidably connected in the guide groove 90301; a roller connecting seat 908 is fixed to the bottom end of the screw rod 901; a one-way bearing 907 is provided on the roller connecting seat 908; the outer ring of the one-way bearing 907 is fixed on the roller connecting seat 908; a friction wheel 906 is fixed to the inner ring of the one-way bearing 907; the wheel body of the friction wheel 906 is tightly against the frame 50; a retaining ring 90201 is fixed on the screw rod 901.

[0061] A first nut 904 is threadedly connected between the roller connecting seat 908 and the sliding seat body 903 ; a spring 905 is connected between the retaining ring 90201 and the first nut 904 .

[0062] The screw rod 901 is threadedly connected to a limiting nut 902 at one end away from the roller connecting seat 908 .

[0063] The screw 901 cannot rotate on the sliding seat body 903; the limit nut 902 serves as the top limit of the screw 901; when the buffer material roller 60 releases the foil strip, the one-way bearing 907 is equivalent to an ordinary bearing, and the friction wheel 906 can rotate relative to the roller connecting seat 908, so that rolling friction (this friction force can be ignored) is formed between the friction wheel 906 and the frame 50, which will not affect the release speed of the buffer material roller 60 to the foil strip. When storing materials, the one-way bearing 907 locks the friction wheel 906, so that the friction wheel 906 cannot rotate relative to the roller connecting seat 908; the wheel body of the friction wheel 906 is tightly pressed against the frame 50, forming a friction force, and the pulling force of the counterweight 100 on a part of the connecting rod 30 is used to overcome the friction force; reducing the tension of the buffer material roller 60 on the foil strip can gradually reduce the tension of the foil strip from the maximum value and then gradually increase it to the value of the normal working state, so that the foil strip is between the unwinding mechanism 10 and the coating die 70. The tension difference between the two positions is gradually reduced, so as to prevent the new foil strip from being violently pulled when the connection assembly releases the clamping of the foil strip, so as to make the whole process of foil strip splicing smoother; by adjusting the first nut 904 to control the pressure of the friction wheel 906 pressed against the frame 50, the friction force of the surface of the friction wheel 906 on the frame 50 is adjusted, and the tension of the buffer material roller 60 when storing material is further controlled, so as to fine-tune the tension of the foil strip in the caching process, so as to make the tension control more precise.

[0064] As a preferred embodiment of the present invention, a pad 80 is fixed on the frame 50; a wedge-shaped surface 801 is provided at one end of the pad 80; the wheel body of the friction wheel 906 is tightly against the pad 80; in the final stage of releasing the foil strip, the friction wheel 906 gradually rolls toward the top of the wedge-shaped surface 801, and the spring 905 is further squeezed; in this way, in the initial state of storing the foil strip, the friction force of the friction wheel 906 on the pad 80 gradually decreases after reaching the maximum value, so that the pressure of the cache material roller 60 on the foil strip slowly increases, so that the foil strip of the unwinding mechanism 10 will not accelerate rapidly at the moment when the docking assembly releases the clamping of the foil strip, thereby reducing the material storage speed of the cache assembly and improving the material discharge stability of the unwinding mechanism 10.

[0065] As a preferred embodiment of the present invention, a fixed shaft 9012 is fixed on the roller connecting seat 908; a support wheel 9011 is rotatably connected to the fixed shaft 9012; the horizontal height of the bottom end of the support wheel 9011 is lower than the horizontal height of the bottom end of the friction wheel 906; because in the process of storing materials, only the friction wheel 906 needs to slide on the wedge surface 801; when the friction wheel 906 leaves the wedge surface 801, the wheel body of the support wheel 9011 is tightly pressed against the surface of the frame 50 to form a rolling connection, so that the friction wheel 906 is suspended in the air, which can ensure the stability of the tension of the cache material roller 60 in the subsequent material storage process.

[0066] As a preferred embodiment of the present invention, the counterweight 100 is a water tank; a water inlet 1001 is provided on the top of the water tank; a drain valve 1002 is provided on the bottom of the water tank; a bracket is fixed on the water tank to ensure that the connecting rod 30 is fixed on the bracket, and the bracket has sufficient strength to ensure that it will not be deformed by pulling.

[0067] The water tank is used as a counterweight. The amount of water in the tank can be controlled by draining water through the drain valve 1002 and adding water through the water inlet 1001, and the weight of the counterweight can be roughly adjusted. This makes the use more flexible and low-cost.

[0068] As a preferred embodiment of the present invention, the docking assembly includes two symmetrically arranged film pressing modules 20; the film pressing module 20 includes a film clamping assembly, a material cutting assembly, a fixed plate 207 fixed on the frame 50, a sliding sleeve 209 fixed on the fixed plate 207, a cylinder 208 fixed at one end on the fixed plate 207, and a movable plate 2011 fixed at the other end of the cylinder 208; a sliding shaft 2010 slidably connected to the sliding sleeve 209 is fixed on the movable plate 2011; a clamping plate 2010 is fixed on the sliding shaft 2010 6; The clamping plate 206 is provided with a welding machine assembly 203; The clamping plate 206, the cutting assembly and the clamping film assembly are arranged along the conveying direction of the foil strip; The welding machine assembly 203 is essentially the same as the prior art, so it is not described in detail; The clamping plate 206 is provided with a through hole 20601 for passing a welding gun, and the welding welding gun can also be provided with a cylinder for adjusting the distance from the welding gun to the welding foil strip; The welding machine assembly 203 extends out of the through hole 20601 to weld the foil strip; The welding method can be selected to be multi-point welding or welding along the cross section of the foil strip;

[0069] After the new foil strip is put into the unwinding mechanism 10, one end of the new coil is first passed through the two clamping plates 206 and clamped and fixed by the film clamping assembly; when the sensor detects that the old coil is about to be used up, the cylinders 208 on both sides respectively drive the movable plate 2011 to move, so that the two clamping plates 206 clamp and fix the foil strip of the new roll and the foil strip of the old film, and then the welding machine assembly 203 welds and fixes the clamped parts of the two foil strips, and at the same time the cutting assembly cuts the new coil, so that the foil strip on one side of the film clamping assembly is separated from the foil strip clamped by the clamping plate 206, and the two clamping plates 206 move away from each other, completing the entire foil strip connection action.

[0070] As a preferred embodiment of the present invention, the film clamping assembly is two mutually parallel pinch rollers 202; the pinch rollers 202 are connected to a reduction box, and the reduction box is connected to a motor, which drives the reduction box to move, so that the two pinch rollers 202 move in different rotation directions; rubber pads are provided on the surfaces of the pinch rollers 202; after the end of the new coil is extended between the two pinch rollers 202, the motor drives the pinch rollers 202 to move through the reduction box, pulls the foil strip and clamps it.

[0071] As a preferred embodiment of the present invention, the outer sleeve of the clamping assembly is provided with a waste box 201 fixed on the frame 50; the front surface of the waste box 201 is provided with a front opening; the clamping roller 202 is arranged in the front opening of the waste box 201; the top of the waste box 201 is provided with a discharge port 20101; after the foil strip is cut by the cutting assembly, the cut foil strip remains between the two clamping rollers 202, and the clamping rollers 202 continue to move to send the cut foil strip into the interior of the waste box 201 for collection; after the foil strip accumulates to a certain amount in the waste box 201, it is manually taken out from the discharge port 20101; in addition to being used to clamp and fix the foil strip so that the foil strip can be stretched and straightened when clamped by the clamping plate 206, which is convenient for cutting and welding, the clamping roller 202 can also directly transfer the cut waste foil strip directly to the waste box 201, and the simple roller structure can play the role of clamping and foil strip transfer.

[0072] As a preferred embodiment of the present invention, the cutting assembly includes a linear module 204; the linear module 204 is fixed on the frame 50; the linear module 204 is connected with a cutter 205; the linear module 204 drives the cutter 205 to move along the lateral direction of the foil strip to achieve cutting of the foil strip; the position of the cutter 205 needs to be close to the clamping plate 206.

[0073] The beneficial effects of the present invention are:

[0074] 1. Two symmetrically arranged connecting rod structures are used to make the buffer rollers generate equal and opposite forces on the sliding seat body in the horizontal direction to balance the influence of the gravity of the buffer rollers on the traction force of the foil strip; during the connection of the foil strip, the tension force on the foil strip is not affected by the gravity of the buffer rollers, which can reduce the deformation of the foil strip caused by excessive stretching;

[0075] 2. No need to consider the influence of the gravity of the buffer roller, different counterweights can be matched according to the tensile strength of different foil strips, and it can be applied to more types of foil strip coating;

[0076] 3. Two symmetrically arranged connecting rods are used to realize synchronous movement of the upper and lower buffer rollers, synchronously buffer and release the foil strip, and reduce the stroke of a single buffer roller. In addition to improving the efficiency of material storage, it can reduce the lifting speed of the buffer roller during material storage and reduce the acceleration of the buffer roller during the start of lifting, thereby reducing the instantaneous impact force on the foil strip.

[0077] 4. In addition to clamping and fixing the foil strip so that the foil strip can be stretched and straightened when clamped by the clamping plate, which is convenient for cutting and welding, the pinch roller can also directly transfer the cut waste foil strip into the waste box. The simple roller structure can play the role of clamping and transferring the foil strip.

[0078] 5. The friction wheel is used to reduce the tension of the buffer material roller on the foil strip in the initial state of material storage, so that the tension of the foil strip can be gradually reduced from the maximum value and then gradually increased to the value of the normal working state, so that the tension difference between the unwinding mechanism 10 and the coating die position of the foil strip is gradually reduced, and it is prevented that the newly spliced ​​foil strip is violently pulled at the moment when the connecting component releases the clamping of the foil strip, so that the whole process of foil strip splicing is smoother; and by adjusting the first nut to control the pressure of the friction wheel pressed on the frame, the friction force of the friction wheel surface on the frame is adjusted, and the tension of the buffer material roller during material storage is further controlled, and the tension of the foil strip in the caching process can be fine-tuned, so that the tension control is more precise.

[0079] 6. In the initial state of storing the foil strip, the friction force of the friction wheel on the pad gradually decreases after reaching the maximum value, so that the pressure of the buffer storage roller on the foil strip slowly increases, so that the foil strip of the unwinding mechanism will not accelerate rapidly at the moment when the connecting component releases the clamping of the foil strip, thereby reducing the storage speed of the buffer component and improving the stability of the unwinding mechanism in unloading.

[0080] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A gap coating machine for lithium battery production, comprising a frame (50); an upper tensioning roller (40), a docking assembly, a buffer assembly, a coating die head (70) and two unwinding mechanisms (10) are arranged on the frame (50); the unwinding mechanism (10), the docking assembly, the upper tensioning roller (40), the buffer assembly and the coating die head (70) are arranged in sequence along the conveying direction of the foil strip; Features: The cache assembly comprises a horizontal sliding seat assembly (90) and two cache material rollers (60); both ends of the cache material rollers (60) are rotatably connected to a lifting sliding seat (601); The lifting sliding seat (601) is connected to the frame (50) in a lifting and sliding manner; two connecting rods (30) are hinged on the horizontal sliding seat assembly (90); the two connecting rods (30) are respectively hinged on the lifting sliding seats (601) of the two buffer material rollers (60); the horizontal sliding seat assembly (90) includes a sliding seat body (903) and a horizontal guide rail (909) fixed on the frame (50); the sliding seat body (903) is slidably connected to the horizontal guide rail (909); the two connecting rods (30) are symmetrically arranged on the upper and lower sides of the horizontal guide rail (909); a counterweight (100) is arranged on a lifting sliding seat (601) at the lower side of the horizontal guide rail (909); the sliding seat body A horizontal sliding block (9010) slidably connected to a horizontal guide rail (909) is fixed on the sliding seat body (903); a guide groove (90301) is provided in the sliding seat body (903); a screw rod (901) is slidably connected in the guide groove (90301); a roller connecting seat (908) is fixed at the bottom end of the screw rod (901); a one-way bearing (907) is provided on the roller connecting seat (908); an outer ring of the one-way bearing (907) is fixed on the roller connecting seat (908); a friction wheel (906) is fixed on the inner ring of the one-way bearing (907); the wheel body of the friction wheel (906) is tightly against the frame (50); a retaining ring (90201) is fixed on the screw rod (901); A first nut (904) is threadedly connected between the roller connecting seat (908) and the sliding seat body (903); a spring (905) is connected between the retaining ring (90201) and the first nut (904); The screw rod (901) is threadedly connected to a limit nut (902) at one end away from the roller connecting seat (908); The docking assembly comprises two symmetrically arranged film pressing modules (20); the film pressing module (20) comprises a film clamping assembly, a material cutting assembly, a fixed plate (207) fixed on a frame (50), a sliding sleeve (209) fixed on the fixed plate (207), a cylinder (208) with one end fixed on the fixed plate (207), and a movable plate (2011) fixed on the other end of the cylinder (208); a sliding shaft (2010) slidably connected to the sliding sleeve (209) is fixed on the movable plate (2011); a clamping plate (206) is fixed on the sliding shaft (2010); a welding machine assembly (203) is arranged on the clamping plate (206); the clamping plate (206), the material cutting assembly and the film clamping assembly are arranged along the conveying direction of the foil strip.

2. A gap coating machine for lithium battery production according to claim 1, characterized in that: A backing plate (80) is fixed on the frame (50); a wedge-shaped surface (801) is provided at one end of the backing plate (80); and the wheel body of the friction wheel (906) is tightly against the backing plate (80).

3. A gap coating machine for lithium battery production according to claim 2, characterized in that: A fixed shaft (9012) is fixed on the roller connecting seat (908); a support wheel (9011) is rotatably connected to the fixed shaft (9012); and the horizontal height of the bottom end of the support wheel (9011) is lower than the horizontal height of the bottom end of the friction wheel (906).

4. A gap coating machine for lithium battery production according to claim 1, characterized in that: The counterweight (100) is a water tank; a water inlet (1001) is provided at the top of the water tank; and a drain valve (1002) is provided at the bottom of the water tank.

5. The gap coating machine for lithium battery production according to claim 1, characterized in that: The film clamping assembly is two mutually parallel clamping rollers (202).

6. A gap coating machine for lithium battery production according to claim 5, characterized in that: The outer sleeve of the film clamping assembly is provided with a waste box (201) fixed on the frame (50); the front surface of the waste box (201) is provided with a front opening; the clamping roller (202) is arranged in the front opening of the waste box (201); and the top of the waste box (201) is provided with a discharge port (20101).

7. A gap coating machine for lithium battery production according to claim 1, characterized in that: The cutting assembly comprises a linear module (204); the linear module (204) is fixed on the frame (50); and a cutter (205) is connected to the linear module (204).

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