Compression molding equipment and method for lithium battery electrode

Abstract

The invention relates to the technical field of lithium battery electrode rolling forming, and discloses a lithium battery electrode pressing forming device and method, the lithium battery electrode pressing forming device comprises a workbench and a base, the top of the workbench and the bottom of the base are fixedly installed, and the two sides of the workbench are each provided with a deviation rectifying tension compensation mechanism. According to the compression molding equipment and method for the lithium battery electrode, the contact detection mechanism can convert a pole piece deviation force into a detection force and transmit different detection forces according to different deviation degrees, and the oil path switching mechanism carries out different opening operations on an oil path according to the magnitude of the detection force; the tension adjusting mechanism converts rotating force into adjusting force for tension compensation adjustment, the tension can be detected and accurately adjusted in real time when the pole piece deviates during high-speed continuous rolling, the problem that the edge of the pole piece and the pressure of a roller are unbalanced due to deviation is effectively solved, and the service life of the pole piece is prolonged. And the conditions that the thickness consistency of the pole piece becomes poor, the compaction density is not uniform, the edge is torn, wrinkles or belt breakage are generated and the like are prevented.

Description

TECHNICAL FIELD

[0001] The application relates to the field of lithium battery electrode roll forming technology, in particular to a pressing forming equipment for lithium battery electrodes. BACKGROUND

[0002] The lithium battery electrode is a core component of the battery, is usually formed by mixing active material, conductive agent, binder and other materials to form a slurry, and is uniformly coated on a metal current collector to form the lithium battery electrode, the positive electrode generally adopts lithium transition metal oxide (such as lithium iron phosphate and ternary material) as the active material, and the negative electrode generally uses graphite or silicon-based material, which jointly participates in the electrochemical reaction to realize the storage and release of energy, wherein, the lithium battery electrode pressing forming is a key process in the manufacturing process, mainly through the continuous rolling of the dried electrode sheet by the rolling machine to make it reach the preset thickness and compaction density, which can enhance the contact between particles, reduce the internal resistance, and at the same time ensure the uniform and dense structure of the electrode, thereby improving the energy density, mechanical stability and cycle performance of the battery.

[0003] In the prior art, the lithium battery electrode roll forming mainly adopts a high-precision double-roller hot rolling machine to continuously press the coated and dried electrode sheet, and by accurately controlling the temperature, pressure, gap and roller speed and other core parameters of the roller, the fluffy electrode material is compacted to the target thickness and density, so as to optimize the conductive contact between the active material particles and reduce the porosity, thereby significantly improving the mechanical strength and unit volume energy density of the electrode under the premise of ensuring the electrolyte infiltration.

[0004] However, the electrode sheet is prone to snake deviation due to factors such as tension fluctuation, guide roller deviation or uneven coating during high-speed continuous rolling, which causes the pressure applied by the edge of the electrode sheet and the roller to be uneven, resulting in local overpressure or underpressure, thereby causing poor thickness consistency of the electrode sheet, uneven compaction thickness, and also causing tearing, wrinkling or belt breakage at the edge of the electrode sheet, which not only affects the production efficiency, but also leads to large batches of electrode sheets being scrapped, significantly increasing the production cost, and ultimately affecting the overall energy density and cycle life consistency of the battery.

[0005] Although the above-mentioned method can solve the deviation of the electrode sheet during pressing, it cannot compensate for the tension during deviation correction, and the sharp deviation correction action will directly break the original tension balance, causing the electrode sheet to appear instantaneous relaxation or over-tightness at the entrance of the roller, which will cause new wrinkles, stretching deformation or even belt breakage of the electrode sheet, and the tension fluctuation will also be transmitted to the compaction area, causing the roller pressure to be unstable, which seriously affects the consistency of the electrode sheet thickness and compaction density, and damages the uniformity of the battery electrode sheet and the product quality. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a pressing forming equipment for lithium battery electrode, which has the advantages of correcting deviation and compensating tension, and solves the problems in the background art.

[0007] The present application provides the following technical solutions: a pressing forming equipment for lithium battery electrode, comprising a workbench and a base, the top of the workbench is fixedly installed with the bottom of the base, and deviation correction tension compensation mechanisms are arranged on both sides of the workbench.

[0008] The power input end of the tension deviation compensation mechanism is provided with a contact detection mechanism for converting deviation force into detection force, and the contact detection mechanism transmits detection force in different degrees according to different degrees of deviation.

[0009] The power output end of the contact detection mechanism is provided with an oil path switch mechanism for converting deviation detection force into switch force, and the oil path switch mechanism performs opening operation on the oil path in different sizes according to different sizes of deviation force.

[0010] The power output end of the oil path switch mechanism is provided with a tension adjustment mechanism for converting rotating force into adjustment force, and the tension adjustment further avoids deviation problems through tension compensation adjustment of the pole piece.

[0011] The deviation correction tension compensation mechanism is composed of the contact detection mechanism, the oil path switch mechanism and the tension adjustment mechanism.

[0012] Preferably, the oil path switch mechanism comprises a rotating rod, a gear one, a double-sided rack, an L-shaped plate, a hydraulic valve, a control valve shaft, a gear two, a transmission pipeline one, a cylinder, a connecting plate and a pushing plate, the outer surface of the rotating rod is rotatably installed with the inner wall of the workbench, the inside of the gear one is fixedly installed with the outer surface of the gear one, the outer surface of the double-sided rack is slidably connected with the inner wall of the workbench, the upper surface of the double-sided rack is engaged with the outer surface of the gear one, the back surface of the L-shaped plate is fixedly installed with the front surface of the workbench, the bottom of the hydraulic valve is fixedly installed with the upper surface of the back end of the L-shaped plate, the outer surface of one end of the control valve shaft is control-connected with the inside of the hydraulic valve, the inside of the gear two is fixedly installed with the outer surface of the control valve shaft, the outer surface of the gear two is engaged with the back surface of the double-sided rack, the inside of one end of the transmission pipeline one is fixedly installed with the output end of the hydraulic valve, the back surface of the cylinder is fixedly installed with the front surface of the L-shaped plate, the front surface of the connecting plate is fixedly installed with one end of the output shaft of the cylinder, the front surface of the pushing plate is fixedly installed with both sides of the back surface of the connecting plate, and the input end of the hydraulic valve is fixedly installed with the transmission pipeline two.

[0013] Preferably, the tension adjusting mechanism comprises gear three, rack two, limit block, U-shaped frame, guide rod, guide block, tension roller and pull frame, the bottom of the U-shaped frame is fixedly installed with the right side of the top of the workbench, the two ends of the guide rod are fixedly installed with the inside of the top of the U-shaped frame, the inner wall of the guide block is slidingly installed with the outer surface of the guide rod, and the outer surface of the guide block is slidingly installed with the inner wall of the U-shaped frame, one end of the tension roller is connected with the back of the guide block, the back of the limit block is fixedly installed with the right side of the front of the workbench, the outer surface of the rack two is slidingly installed with the inner wall of the limit block, the outer surface of the gear three is engaged with the back of the rack two, the left side of the pull frame is fixedly installed with the right side of the rack two, and the inside of the gear three is fixedly installed with the outer surface of the rotating rod.

[0014] Preferably, the contact detection mechanism comprises a fixed track, a deviation rectifying frame, a connecting frame, a sliding frame, a receiving block, a detection guide roller, a connecting spring and a telescopic rod, the bottom of the fixed track is fixedly installed with the inside of the base, the inner wall of the bottom end of the deviation rectifying frame is slidingly connected with the outer surface of the fixed track, the bottom of the connecting frame is fixedly installed with the top of the deviation rectifying frame, the outer surface of the bottom end of the sliding frame is slidingly connected with the inner wall of the connecting frame, the upper surface of the receiving block is fixedly installed with the lower surface of the sliding frame, the outer surface of the detection guide roller is connected with the lower surface of the receiving block, one end of the connecting spring is fixedly installed with the inside of the connecting frame, one end of the telescopic rod is fixedly installed with the inside of the connecting frame, and the other end of the connecting spring and the telescopic rod is fixedly installed with the front of the sliding frame.

[0015] Preferably, the position of the pull frame abuts against the top of the guide block after descending, and can drive the position change of the tension roller, for adjusting the tension change operation of the pole piece.

[0016] Preferably, the inside of the deviation rectifying frame is provided with a plurality of guide rollers which are evenly arranged along the axis of the deviation rectifying frame.

[0017] Preferably, the front of the connecting frame is fixedly installed with a transmission frame, the bottom of the transmission frame is fixedly installed with a rack one, the outer surface of the rack one is slidingly installed with the inner wall of the workbench, and the lower surface of the rack one is engaged with the upper surface of the gear one.

[0018] Preferably, the left side of the upper surface of the workbench is fixedly installed with a frame, the back of the frame is fixedly installed with a placing block, the back of the placing block is provided with a servo motor, one end of the output shaft of the servo motor is fixedly installed with a transmission shaft, one end of the transmission shaft is fixedly installed with a roller, and the outer surface of the other end of the transmission shaft is provided with a bearing seat.

[0019] Preferably, the top of the frame is provided with a hydraulic cylinder, and the hydraulic cylinder can control the height position change of the change roller.

[0020] A pressing forming method for lithium battery electrode, comprising the following specific steps:

[0021] S1, the pole piece passes through the guide roller on the deviation rectifying frame and transmits forward; when the snake-shaped deviation occurs, the pole piece edge extrudes the detection guide roller, so that it drives the transmission frame and the rack one to move downward, the transverse deviation amount is converted into the vertical displacement amount of the rack one,

[0022] S2, the downward moving rack one drives the gear one to rotate, in turn drives the coaxial gear three to rotate, and pushes the double-sided rack to move horizontally; the double-sided rack drives the gear two and the control valve shaft to rotate, so that the opening of the hydraulic valve is accurately adjusted, the deviation signal is converted into the hydraulic signal output,

[0023] S3, the pressure oil output by the hydraulic valve drives the piston rod of the air cylinder to extend through the transmission pipeline one; the piston rod pushes the whole deviation rectifying frame to slide along the fixed track horizontally through the connecting plate and the pushing plate, changes the pole piece path geometry, so as to push it back to the center position, completes the deviation rectification,

[0024] S4, while the gear one rotates, the synchronously rotating gear three drives the rack two and the pulling frame to move downward; the downward moving pulling frame presses the guide block to slide along the guide rod, drives the tension roller to move downward, actively changes the pole piece wrap angle and path length, and compensates the tension fluctuation caused by the deviation rectification action in real time and synchronously, finally ensures that the pole piece enters the roller for pressing forming with constant tension.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1. The lithium battery electrode pressing forming device can convert the pole piece deviation force into detection force through the contact detection mechanism, and transmit different detection forces through different deviation degrees, the oil circuit switch mechanism can perform different opening operations on the oil circuit according to the detection force, and the tension adjusting mechanism can convert the rotating force into adjusting force for tension compensation adjustment, so that the tension can be detected and adjusted accurately in real time when the pole piece deviates during high-speed continuous rolling, the problems of uneven pressure of the pole piece edge and the roller caused by deviation are effectively avoided, the thickness consistency of the pole piece is prevented from being poor, the compaction density is prevented from being uneven, the edge is prevented from being torn, and the situations of wrinkle or broken belt are prevented from occurring, the number of shutdown adjustment is reduced, the production efficiency is improved, the production cost is reduced, and the overall energy density and cycle life consistency of the battery are ensured.

[0027] 2. The lithium battery electrode pressing device, through the tension adjusting mechanism, realizes tension adjustment, the position of the pulling frame is lowered to drive the position change of the tension roller to adjust the electrode piece tension, avoids the sharp correction action to break the original tension balance, prevents the electrode piece from appearing instantaneous relaxation or over-tight phenomenon at the entrance of the roller, reduces the risk of new wrinkles, stretching deformation or even broken strip of the electrode piece, at the same time avoids the transmission of tension fluctuation to the compaction area to make the roller pressure unstable, ensures the consistency of the electrode piece thickness and compaction density, improves the uniformity of the battery electrode piece and product quality. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is whole structure schematic diagram of the device of the application;

[0029] Figure 2 It is top view structure schematic diagram of the application Figure 1 ;

[0030] Figure 3 It is back view structure schematic diagram of the application Figure 1 ;

[0031] Figure 4 It is local structure schematic diagram of the application Figure 1 ;

[0032] Figure 5 It is structure enlarged schematic diagram of A of the application Figure 4 ;

[0033] Figure 6 It is one side structure schematic diagram of the application Figure 4 ;

[0034] Figure 7 It is structure enlarged schematic diagram of B of the application Figure 6 ;

[0035] Figure 8 It is local structure schematic diagram of the application Figure 4 ;

[0036] Figure 9 It is structure enlarged schematic diagram of C of the application Figure 8 ;

[0037] In the figure: 1, workbench; 2, frame; 3, placing block; 4, servo motor; 5, transmission shaft; 6, roller; 7, hydraulic cylinder; 8, bearing seat; 9, base; 10, fixed rail; 11, deviation rectifying frame; 12, guide roller; 13, connecting frame; 14, sliding frame; 15, bearing block; 16, detection guide roller; 17, connecting spring; 18, telescopic rod; 19, rotating rod; 20, gear one; 21, double-sided rack; 22, L-shaped plate; 23, hydraulic valve; 24, control valve shaft; 25, gear two; 26, transmission pipeline one; 27, transmission pipeline two; 28, air cylinder; 29, connecting plate; 30, push plate; 31, gear three; 32, rack two; 33, limiting block; 34, U-shaped frame; 35, guide rod; 36, guide block; 37, tension roller; 38, pulling frame; 39, transmission frame; 40, rack one. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] Please refer to Figure 4 , Figure 6 and Figure 7 , a pressing forming device for lithium battery electrode, comprising a workbench 1 and a base 9, the top of the workbench 1 and the bottom of the base 9 are fixedly installed, and deviation rectifying and tension compensation mechanisms are arranged on both sides of the workbench 1.

[0040] A contact detection mechanism for converting deviation force into detection force is arranged at the power input end of the tension deviation rectifying and compensation mechanism, and the contact detection mechanism transmits detection force in different degrees according to different degrees of deviation;

[0041] An oil circuit switch mechanism for converting deviation detection force into switch force is arranged at the power output end of the contact detection mechanism, and the oil circuit switch mechanism opens the oil circuit in different sizes according to different sizes of deviation force;

[0042] A tension adjusting mechanism for converting rotating force into adjusting force is arranged at the power output end of the oil circuit switch mechanism, and the tension adjusting mechanism further avoids deviation problems through tension compensation adjustment of the pole piece;

[0043] The deviation correction tension compensation mechanism is composed of a contact detection mechanism, an oil path switch mechanism and a tension adjusting mechanism. The oil path switch mechanism comprises a rotating rod 19, a gear one 20, a double-sided rack 21, an L-shaped plate 22, a hydraulic valve 23, a control valve shaft 24, a gear two 25, a transmission pipeline one 26, a cylinder 28, a connecting plate 29 and a pushing plate 30. The outer surface of the rotating rod 19 is rotatably installed with the inner wall of the workbench 1. The inner part of the gear one 20 is fixedly installed with the outer surface of the gear one 20. The outer surface of the double-sided rack 21 is slidably connected with the inner wall of the workbench 1, and the upper surface of the double-sided rack 21 is engaged with the outer surface of the gear one 20. The back surface of the L-shaped plate 22 is fixedly installed with the front surface of the workbench 1. The bottom of the hydraulic valve 23 is fixedly installed with the upper surface of the back end of the L-shaped plate 22. The outer surface of one end of the control valve shaft 24 is control-connected with the inner part of the hydraulic valve 23. The inner part of the gear two 25 is fixedly installed with the outer surface of the control valve shaft 24. The outer surface of the gear two 25 is engaged with the back surface of the double-sided rack 21. The inner part of one end of the transmission pipeline one 26 is fixedly installed with the output end of the hydraulic valve 23. The back surface of the cylinder 28 is fixedly installed with the front surface of the L-shaped plate 22. The front surface of the connecting plate 29 is fixedly installed with one end of the output shaft of the cylinder 28. The front surface of the pushing plate 30 is fixedly installed with both sides of the back surface of the connecting plate 29. The input end of the hydraulic valve 23 is fixedly installed with the transmission pipeline two 27.

[0044] Specifically, the rotating rod 19 is rotatably installed with the inner wall of the workbench 1. When receiving external power input, the rotating rod 19 can stably rotate. The gear one 20 is fixedly installed on the rotating rod 19 and engaged with the upper surface of the double-sided rack 21. The double-sided rack 21 can slide in the inner wall of the workbench 1. This transmission design can accurately convert the rotation of the rotating rod 19 into the linear sliding of the double-sided rack 21. The transmission process is stable and has high accuracy. Meanwhile, the gear two 25 is engaged with the back surface of the double-sided rack 21, and the gear two 25 is control-connected with the inner part of the hydraulic valve 23 through the control valve shaft 24. The sliding of the double-sided rack 21 drives the gear two 25 to rotate, and then accurately controls the opening degree of the hydraulic valve 23 through the control valve shaft 24. This multi-stage transmission structure can accurately adjust the opening size of the oil path according to the different power generated by the pole piece deviation, ensure that the oil path flow matches the actual demand, avoid the problem of energy waste caused by the oil path opening too large or the problem of not meeting the deviation power demand caused by the oil path opening too small. The cylinder 28 can output power according to the actual demand, drive the pushing plate 30 to act through the connecting plate 29, and the pushing plate 30 can assist in pushing or adjusting other components related to the oil path, further optimizing the pressure and flow distribution of the oil path. For example, when the pole piece deviation is relatively complex, the auxiliary adjustment of the cylinder 28 can cooperate with the opening control of the hydraulic valve 23 to more accurately control the oil path power and enhance the adjustment ability of the pole piece tension, thereby more effectively avoiding the pole piece deviation and improving the quality and stability of the lithium battery electrode pressing forming.

[0045] Please refer toFigure 8 And Figure 9 The tension adjusting mechanism comprises a gear three 31, a rack two 32, a limiting block 33, a U-shaped frame 34, a guide rod 35, a guide block 36, a tension roller 37 and a pulling frame 38. The bottom of the U-shaped frame 34 is fixedly installed on the right side of the top of the workbench 1. The two ends of the guide rod 35 are fixedly installed on the inside of the top of the U-shaped frame 34. The inner wall of the guide block 36 is slidingly installed on the outer surface of the guide rod 35, and the outer surface of the guide block 36 is slidingly installed on the inner wall of the U-shaped frame 34. One end of the tension roller 37 is connected to the back of the guide block 36. The back of the limiting block 33 is fixedly installed on the right side of the front of the workbench 1. The outer surface of the rack two 32 is slidingly installed on the inner wall of the limiting block 33. The outer surface of the gear three 31 is engaged with the back of the rack two 32. The left side of the pulling frame 38 is fixedly installed on the right side of the rack two 32. The inside of the gear three 31 is fixedly installed on the outer surface of the rotating rod 19. The position of the pulling frame 38 is lowered to abut against the top of the guide block 36, and can drive the position of the tension roller 37 to change, for adjusting the tension change operation of the pole piece.

[0046] Specifically, the gear three 31 is engaged with the rack two 32, and the gear three 31 is fixed on the rotating rod 19. When the rotating rod 19 rotates, it can accurately drive the gear three 31 to rotate, thereby making the rack two 32 stably slide in the limiting block 33. The moving distance of the rack two 32 can be controlled according to different power generated by the pole piece deviation, so as to provide an accurate displacement for the position adjustment of the tension roller 37, and ensure the accuracy of the pole piece tension adjustment. The left side of the pulling frame 38 is fixedly connected with the right side of the rack two 32. When the rack two 32 moves under the driving of the gear three 31, the pulling frame 38 can move quickly, and the position of the pulling frame 38 can abut against the top of the guide block 36 after being lowered, and drive the position of the tension roller 37 to change. The whole process from the rotation of the rotating rod 19 to the position adjustment of the tension roller 37 responds quickly, so that when the pole piece just appears a deviation trend, the pole piece tension can be changed in time by adjusting the position of the tension roller 37, the pole piece deviation can be quickly corrected, the pole piece deviation is prevented from being further deteriorated, and the deviation correction efficiency of the equipment is improved.

[0047] The two ends of the guide rod 35 are fixedly installed on the inside of the top of the U-shaped frame 34. The guide block 36 can slide on the outer surface of the guide rod 35 and on the inner wall of the U-shaped frame 34. The double guide structure effectively limits the movement track of the guide block 36, so that it can only make reciprocating motion along a straight line, avoiding the deviation or shaking of the guide block 36 in the movement process, thereby ensuring that the tension roller 37 connected to the back of the guide block 36 can stably change the position, and further ensuring the accuracy and stability of the pole piece tension adjustment.

[0048] Please refer to Figure 4 And Figure 5The contact detection mechanism comprises a fixed track 10, a deviation rectifying frame 11, a connecting frame 13, a sliding frame 14, a receiving block 15, a detection guide roller 16, a connecting spring 17 and an extension rod 18. The bottom of the fixed track 10 is fixedly installed in the inner part of the base 9. The inner wall of the bottom end of the deviation rectifying frame 11 is slidably connected with the outer surface of the fixed track 10. The bottom of the connecting frame 13 is fixedly installed with the top of the deviation rectifying frame 11. The outer surface of the bottom end of the sliding frame 14 is slidably connected with the inner wall of the connecting frame 13. The upper surface of the receiving block 15 is fixedly installed with the lower surface of the sliding frame 14. The outer surface of the detection guide roller 16 is connected with the lower surface of the receiving block 15. One end of the connecting spring 17 is fixedly installed in the inner part of the connecting frame 13. One end of the extension rod 18 is fixedly installed in the inner part of the connecting frame 13. The other end of the connecting spring 17 and the other end of the extension rod 18 are fixedly installed with the front surface of the sliding frame 14. The front surface of the connecting frame 13 is fixedly installed with a transmission frame 39. The bottom of the transmission frame 39 is fixedly installed with a rack one 40. The outer surface of the rack one 40 is slidably installed with the inner wall of the workbench 1. The lower surface of the rack one 40 is engaged with the upper surface of the gear one 20.

[0049] Specifically, the detection guide roller 16 is connected with the sliding frame 14 through the receiving block 15. The sliding frame 14 can slide in the inner wall of the connecting frame 13. When the position of the pole piece deviates during the operation, the detection guide roller 16 will be impacted by the transverse force due to the contact with the pole piece, thereby driving the sliding frame 14 to slide in the connecting frame 13, so that the detection guide roller 16 can flexibly respond to the position change of the pole piece and timely sense the deviation of the pole piece, thereby providing accurate signal input for the subsequent deviation rectifying action. One end of the connecting spring 17 and one end of the extension rod 18 are fixedly installed in the inner part of the connecting frame 13 and the other end is fixedly installed in the front surface of the sliding frame 14. When the detection guide roller 16 is impacted or vibrated by the pole piece, the connecting spring 17 can absorb and buffer part of the impact force through the elastic deformation of itself, thereby reducing the influence of vibration on the sliding frame 14. The extension rod 18 limits the sliding range of the sliding frame 14 and provides stable support, thereby preventing the sliding frame 14 from excessively sliding or shaking due to excessive impact force, improving the stability of the contact between the detection guide roller 16 and the pole piece, ensuring the accuracy and reliability of the detection signal, and automatically rebounding after rectifying the deviation and closing the oil way. When the deviation rectifying frame 11 drives the connecting frame 13 to move, the rack one 40 will slide in the inner wall of the workbench 1 and transmit the displacement signal of the deviation of the pole piece to the subsequent oil way switch mechanism and other deviation rectifying components through the engagement transmission with the gear one 20, thereby ensuring the effective linkage between the detection mechanism and the deviation rectifying execution mechanism and realizing the accurate adjustment and deviation rectifying control of the pole piece tension.

[0050] Please refer to Figure 1 , Figure 2 and Figure 3The left side of the upper surface of the workbench 1 is fixedly provided with a frame 2, the back surface of the frame 2 is fixedly provided with a placing block 3, the back surface of the placing block 3 is provided with a servo motor 4, one end of the output shaft of the servo motor 4 is fixedly provided with a transmission shaft 5, one end of the transmission shaft 5 is fixedly provided with a roller 6, the outer surface of the other end of the transmission shaft 5 is provided with a bearing seat 8, the top of the frame 2 is provided with a hydraulic cylinder 7, and the hydraulic cylinder 7 can control the height position change of the roller 6.

[0051] Specifically, the servo motor 4 is installed on the placing block 3, the output shaft of the servo motor 4 is fixedly connected with the transmission shaft 5, the servo motor 4 has high-precision speed and torque control capability, can accurately output power according to the preset program, and makes the transmission shaft 5 stably rotate at a predetermined speed and direction, in the pole piece rolling process, the accurate driving control can ensure that the roller 6 rolls the pole piece at a constant speed, avoids problems such as uneven thickness and poor surface quality of the pole piece caused by unstable power, improves the rolling quality of the product, and the hydraulic cylinder 7 arranged on the top of the frame 2 can control the height position change of the roller 6, in actual production, different specifications of the pole piece may have different requirements for rolling thickness and pressure, by adjusting the hydraulic cylinder 7, the height of the roller 6 can be easily changed, so that the gap between the rollers 6 is adjusted, the accurate control of the rolling thickness of the pole piece is realized, the equipment can adapt to the production requirements of pole pieces of various specifications, and the versatility and production efficiency of the equipment are improved.

[0052] A kind of pressing forming method for lithium battery electrode, comprising the following specific steps:

[0053] S1, pole piece passes through the guide roller 12 on deviation rectifying frame 11 and is transmitted forward;When snake shape deviation occurs, the pole piece edge extrusion detection guide roller 16, so that it drives transmission frame 39 and rack one 40 to move downward by sliding frame 14, convert the lateral deviation amount into the vertical displacement amount of rack one 40,

[0054] S2, rack one 40 drives gear one 20 to rotate, in turn drives coaxial gear three 31 to rotate, and pushes double-sided rack 21 to move horizontally;Double-sided rack 21 drives gear two 25 and control valve shaft 24 to rotate, thereby accurately adjusting the opening of hydraulic valve 23, converts the deviation signal into hydraulic signal output,

[0055] S3, the pressure oil output by hydraulic valve 23 drives the piston rod of cylinder 28 to extend through transmission pipeline one 26;The piston rod pushes the whole deviation rectifying frame 11 to slide along fixed track 10 horizontally through connecting plate 29 and push plate 30, changes the pole piece path geometry, thereby pushing it back to the center position, completes deviation rectification,

[0056] S4, while the gear one 20 rotates, the synchronous rotating gear three 31 drives the rack two 32 and the pull frame 38 to move downward; the downward moving pull frame 38 presses the guide block 36 to slide along the guide rod 35, and drives the tension roller 37 to move downward, actively changes the pole piece wrap angle and path length, and compensates the tension fluctuation caused by the deviation correction action in real time and synchronously, finally ensures the pole piece to enter the roller 6 for pressing forming with constant tension.

[0057] Working principle, in use, the pole piece first passes through the external winding roller and the tension roller 37, passes through the multiple sets of guide rollers 12 on the deviation correction frame 11, when the pole piece deviates, the edge thereof will extrude the detection guide roller 16, the detection guide roller 16 will transmit the transverse deviation force received to the sliding frame 14, compresses the connecting spring 17 and makes the telescopic rod 18 contract, the downward movement of the sliding frame 14 drives the transmission frame 39 and the rack one 40 on the front face thereof to move downward synchronously, at this time, the transverse deviation displacement of the pole piece is accurately converted into the vertical linear displacement of the rack one 40, the more serious the deviation is, the greater the force extruding the detection guide roller 16 is, and the greater the displacement amount of the downward moving rack one 40 is, the downward moving rack one 40 drives the gear one 20 engaged therewith to rotate, the rotation of the gear one 20 drives the double-sided rack 21 engaged therewith to move horizontally, the horizontal movement of the double-sided rack 21 drives the gear two 25 on the back face thereof to rotate, the rotation of the gear two 25 drives the control valve shaft 24 to rotate, thereby changing the opening of the valve core in the hydraulic valve 23, at this time, the deviation amount of the pole piece is converted into the control signal of the oil flow and direction output by the hydraulic valve 23, after the hydraulic valve 23 is opened, the external pressure oil first enters the inside of the hydraulic valve 23 through the transmission pipeline two 27, and then enters the cylinder 28 through the transmission pipeline one 26, the output shaft of the cylinder 28 extends, pushes the connecting plate 29 and the push plate 30 to move forward, the output shaft of the cylinder 28 extends, pushes the connecting plate 29 and the push plate 30 to move forward, the translation of the deviation correction frame 11 changes the path of the pole piece on the guide roller 12 inside the deviation correction frame 11, generates a transverse component force, pushes the deviated pole piece back to the center position, completes the deviation correction, and through the connecting spring 17 and the telescopic rod 18, the deviation correction can be automatically rebounded after the oil circuit is provided and the deviation correction is completed, the oil circuit is closed, and when the rotating rod 19 rotates, the gear three 31 fixed thereon rotates synchronously, the gear three 31 rotates, drives the rack two 32 engaged therewith to move in the vertical direction, the downward movement of the rack two 32 drives the pull frame 38 to move downward, the lower surface of the pull frame 38 abuts against the top of the guide block 36 and presses the guide block 36 to slide downward along the guide rod 35, the downward movement of the guide block 36 drives the tension roller 37 on the back face thereof to move downward, the downward movement of the tension roller 37 instantaneously increases the wrap angle and path length of the pole piece in the system, realizes the accurate linkage of the deviation correction and the tension compensation, and keeps the tension at the entrance of the roller 6 constant.

[0058] It should be noted that the above-mentioned electrical elements and electrical equipment all use external power supply, the circuits and electronic components and modules involved in the present application are all prior art, and those skilled in the art can fully realize them without further description, and the content protected by the present application does not involve the improvement of internal structure and method; in addition, in this article, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0059] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A pressing and molding equipment for lithium battery electrodes, characterized in that: It includes a workbench (1) and a base (9), with the top of the workbench (1) and the bottom of the base (9) fixedly installed, and a correction tension compensation mechanism is provided on both sides of the workbench (1). The power input end of the tension correction compensation mechanism is equipped with a contact detection mechanism that converts the deviation force into a detection force. The contact detection mechanism transmits different levels of detection force depending on the degree of deviation. The power output end of the contact detection mechanism is equipped with an oil circuit switch mechanism that rotates the deviation detection force into a switching force. The oil circuit switch mechanism performs different opening operations on the oil circuit based on the magnitude of the deviation force. The power output end of the oil circuit switch mechanism is equipped with a tension adjustment mechanism that converts rotational power into adjustment force. The tension adjustment further avoids deviation problems through tension compensation adjustment of the electrode plates. The corrective tension compensation mechanism consists of a contact detection mechanism, an oil circuit switch mechanism, and a tension adjustment mechanism.

2. The pressing and molding equipment for lithium battery electrodes according to claim 1, characterized in that: The oil circuit switching mechanism includes a rotating rod (19), a first gear (20), a double-sided rack (21), an L-shaped plate (22), a hydraulic valve (23), a control valve shaft (24), a second gear (25), a first transmission pipeline (26), a cylinder (28), a connecting plate (29), and a push plate (30). The outer surface of the rotating rod (19) is rotatably mounted to the inner wall of the workbench (1). The interior of the first gear (20) is fixedly mounted to the outer surface of the first gear (20). The outer surface of the double-sided rack (21) is slidably connected to the inner wall of the workbench (1), and the upper surface of the double-sided rack (21) meshes with the outer surface of the first gear (20). The back of the L-shaped plate (22) is fixedly mounted to the front of the workbench (1). The bottom of the hydraulic valve (23) is connected to the L-shaped plate (22). The upper surface of the back end of the profile plate (22) is fixedly installed. The outer surface of one end of the control valve shaft (24) is connected to the internal control of the hydraulic valve (23). The interior of the gear two (25) is fixedly installed with the outer surface of the control valve shaft (24). The outer surface of the gear two (25) meshes with the back of the double-sided rack (21). The interior of one end of the transmission pipeline one (26) is fixedly installed with the output end of the hydraulic valve (23). The back of the cylinder (28) is fixedly installed with the front of the L-shaped plate (22). The front of the connecting plate (29) is fixedly installed with one end of the output shaft of the cylinder (28). The front of the push plate (30) is fixedly installed with both sides of the back of the connecting plate (29). The input end of the hydraulic valve (23) is fixedly installed with the transmission pipeline two (27).

3. The pressing and molding equipment for lithium battery electrodes according to claim 1, characterized in that: The tension adjustment mechanism includes a gear three (31), a rack two (32), a limiting block (33), a U-shaped frame (34), a guide rod (35), a guide block (36), a tension roller (37), and a pulling frame (38). The bottom of the U-shaped frame (34) is fixedly installed to the right side of the top of the workbench (1). Both ends of the guide rod (35) are fixedly installed to the inside of the top of the U-shaped frame (34). The inner wall of the guide block (36) is slidably installed with the outer surface of the guide rod (35), and the outer surface of the guide block (36) is flush with the U-shaped frame (38). The inner wall of the tension roller (37) is slidably installed, one end of the tension roller (37) is connected to the back of the guide block (36), the back of the limiting block (33) is fixedly installed to the right side of the front of the worktable (1), the outer surface of the rack (32) is slidably installed to the inner wall of the limiting block (33), the outer surface of the gear (31) meshes with the back of the rack (32), the left side of the pulling frame (38) is fixedly installed to the right side of the rack (32), and the inside of the gear (31) is fixedly installed to the outer surface of the rotating rod (19).

4. The pressing and molding equipment for lithium battery electrodes according to claim 1, characterized in that: The contact detection mechanism includes a fixed track (10), a correction frame (11), a connecting frame (13), a sliding frame (14), a receiving block (15), a detection guide roller (16), a connecting spring (17), and a telescopic rod (18). The bottom of the fixed track (10) is fixedly installed inside the base (9). The inner wall of the bottom end of the correction frame (11) is slidably connected to the outer surface of the fixed track (10). The bottom of the connecting frame (13) is fixedly installed to the top of the correction frame (11). The bottom end of the sliding frame (14) is... The outer surface of the sliding frame (14) is slidably connected to the inner wall of the connecting frame (13). The upper surface of the receiving block (15) is fixedly installed to the lower surface of the sliding frame (14). The outer surface of the detection guide roller (16) is connected to the lower surface of the receiving block (15). One end of the connecting spring (17) is fixedly installed to the inside of the connecting frame (13). One end of the telescopic rod (18) is fixedly installed to the inside of the connecting frame (13). The other ends of the connecting spring (17) and the telescopic rod (18) are both fixedly installed to the front of the sliding frame (14).

5. The pressing and molding equipment for lithium battery electrodes according to claim 3, characterized in that: After the position of the pull frame (38) is lowered, it abuts against the top of the guide block (36) and can drive the position of the tension roller (37) to change, which is used to adjust the tension of the electrode.

6. The pressing and molding equipment for lithium battery electrodes according to claim 4, characterized in that: The correction frame (11) is equipped with multiple sets of guide rollers (12), and the guide rollers (12) are evenly distributed along the axis of the correction frame (11).

7. The pressing and molding equipment for lithium battery electrodes according to claim 4, characterized in that: A transmission frame (39) is fixedly installed on the front of the connecting frame (13), and a rack (40) is fixedly installed on the bottom of the transmission frame (39). The outer surface of the rack (40) is slidably installed with the inner wall of the workbench (1), and the lower surface of the rack (40) meshes with the upper surface of the gear (20).

8. The pressing and molding equipment for lithium battery electrodes according to claim 1, characterized in that: A frame (2) is fixedly installed on the left side of the upper surface of the workbench (1). A placement block (3) is fixedly installed on the back of the frame (2). A servo motor (4) is installed on the back of the placement block (3). A transmission shaft (5) is fixedly installed at one end of the output shaft of the servo motor (4). A roller (6) is fixedly installed at one end of the transmission shaft (5). A bearing seat (8) is provided on the outer surface of the other end of the transmission shaft (5).

9. A pressing and molding apparatus for lithium battery electrodes according to claim 8, characterized in that: A hydraulic cylinder (7) is provided on the top of the frame (2), and the hydraulic cylinder (7) can control the change in the height position of the variable roll (6).

10. A pressing molding method for lithium battery electrodes, characterized in that, The specific steps include the following: S1. The electrode sheet is transmitted forward through the guide roller (12) on the correction frame (11); when a serpentine deviation occurs, the edge of the electrode sheet presses against the detection guide roller (16), causing it to drive the transmission frame (39) and rack 1 (40) downward through the sliding frame (14), converting the lateral deviation into the vertical displacement of rack 1 (40). S2. The downward-moving rack one (40) drives gear one (20) to rotate, which in turn drives the coaxial gear three (31) to rotate, and pushes the double-sided rack (21) to move horizontally; the double-sided rack (21) drives gear two (25) and the control valve shaft (24) to rotate, thereby precisely adjusting the opening of the hydraulic valve (23) and converting the deviation signal into a hydraulic signal output. S3, the pressure oil output by the hydraulic valve (23) drives the piston rod of the cylinder (28) to extend through the transmission pipeline (26); the piston rod pushes the entire correction frame (11) to slide laterally along the fixed track (10) through the connecting plate (29) and the push plate (30), changing the geometry of the electrode path, thereby pushing it back to the center position and completing the correction. S4. While gear one (20) rotates, gear three (31) rotates synchronously, driving rack two (32) and pull frame (38) to move downward. The downward-moving pull frame (38) presses the guide block (36) to slide along the guide rod (35), driving the tension roller (37) to move downward, actively changing the electrode wrap angle and path length, and compensating for the tension fluctuation caused by the correction action in real time and synchronously, so as to ensure that the electrode enters the roll (6) with constant tension for pressing and forming.

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