A pressing device for multi-layer composite of battery pole piece

Abstract

The application relates to a pressing device for multilayer compounding of battery pole pieces, and relates to the technical field of battery manufacturing equipment. The device comprises a rack, a lower pressing roller and an upper pressing roller in the rack, and a flattening mechanism at the rear side of the rack. The flattening mechanism comprises a cover bin, first and second guide roller pieces at the rear side and the front side in the cover bin, a supporting roller at the lower side in the rack and a compaction structure directly above the supporting roller, and the compaction structure penetrates through a side wall through groove of the cover bin and slides in the direction of the pole piece. The compaction structure comprises a power assembly and a flattening roller, the power assembly drives the flattening roller to longitudinally reciprocate and rub, and drives the flattening roller to axially vibrate through a motion unit, so that transverse high-frequency micro-rubbing is formed. The two-dimensional rubbing can discharge interlayer bubbles, promote particle rearrangement and interlocking, and release internal stress. After rubbing, normal compaction and shaping are carried out. The application realizes continuous operation of the two-dimensional rubbing and roller pressing and shaping, improves the interlayer bonding strength and flatness, and has a flexible and adjustable structure.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing equipment, and in particular to a pressing apparatus for multilayer composite of battery electrodes. Background Technology

[0002] In the lithium battery manufacturing process, the rolling process of the electrode sheet is crucial to the battery performance. The electrode sheet is usually made by pressing a current collector and a film layer coated with active material together, and needs to go through the rolling process to obtain the predetermined thickness and compaction density. Roll-to-roll continuous rolling is the current mainstream electrode sheet production process. It applies normal pressing force to the continuously moving multi-layer electrode sheet through one or more pairs of pressure rollers, and completes the pressing and shaping while pulling the electrode sheet forward.

[0003] Currently, Chinese patent application number CN202510912496.8 discloses a double-roller pressing machine for lithium battery manufacturing. This machine includes a base, a lifting frame, a support frame, a conveying assembly, a stabilizing assembly, and a rolling assembly. The lifting frame and support frame are fixed to opposite sides of the top of the base. The conveying assembly is fixedly installed on top of the lifting frame for guiding and transporting the lithium battery electrodes. The stabilizing assembly is fixedly installed at the bottom of the conveying assembly for bottom protection during electrode transport. The rolling assembly is rotatably installed inside the support frame and adapted to the stabilizing assembly. Before electrode pressing, the operator adjusts the height of the guide rollers and the support frame assembly so that the electrodes are placed above the support frame assembly. The guide rollers and rotating rods are positioned on both sides of the electrodes during transport, generating friction against the electrode surface. A second motor drives the guide rollers to rotate and guide the electrodes, pre-treating them with the guide rollers and rotating rods before pressing, resulting in a closer fit during pressing. Meanwhile, the inclined lifting frame cleans dust from the electrode surface during electrode conveying through friction between the guide rollers and rotating rods and the electrode. Furthermore, in the roller pressing assembly of this equipment, an extension frame is installed between the pressing rollers and the inner rollers. This extension frame can rotate within the positioning block according to changes in electrode thickness, thereby adjusting the spacing between the pressing rollers to accommodate pressing electrodes of different thicknesses.

[0004] However, in existing technologies, before the electrode sheets are pressed together, the tiny air bubbles mixed into the layers during coating and bonding of the multi-layer electrode sheets are not easily removed before rolling. This makes it easy for the tiny air bubbles to remain inside the electrode sheets after rolling, forming local weak points in the adhesion. At the same time, the direction of the static pressure applied by the roller is relatively unidirectional, and the effect of homogenizing and releasing the residual stress inside the electrode sheets is not ideal. The finished electrode sheets may still have problems of bending and warping during subsequent slitting or winding. Summary of the Invention

[0005] The purpose of this application is to provide a pressing device for multilayer composite of battery electrodes to solve the problems in the prior art.

[0006] This application provides a pressing device for multi-layer composite of battery electrode sheets, which adopts the following technical solution: it includes a frame, a lower pressing roller is rotatably connected to the bottom side inside the frame, an upper pressing roller is arranged above the lower pressing roller, the left and right sides of the upper pressing roller are respectively rotatably connected to the inside of a sliding seat, the two sliding seats are respectively longitudinally slidably connected to the left and right sides of the frame, and each of the two sliding seats is connected to a cylinder through a pressing member. A flattening mechanism for kneading and composite of multi-layer electrode sheets is arranged on the rear side of the frame. The leveling mechanism includes a cover chamber fixed to the frame on the left and right sides of the front. A first guide roller and a second guide roller are respectively provided on the rear and front sides of the cover chamber. The first guide roller and the second guide roller are located on the same horizontal plane and are each composed of two guide rollers, one above the other. A support roller is provided on the lower middle side of the frame. The support roller corresponds to the position of the guide rollers located below the first guide roller and the second guide roller. A compaction structure is provided above the support roller. A first through groove and a second through groove are respectively opened on the left and right side walls of the cover chamber. The compaction structure is provided through the inner side of the first through groove and the second through groove.

[0007] Preferably, the pressing component includes a pressing rod rotatably connected to the top center of the shifting seat. The pressing rod is in the form of two pieces, with a connecting rod rotatably connected to the upper inner side of the pressing rod. The top side of the connecting rod is rotatably connected to the bottom output shaft of the cylinder. A synchronizing rod is rotatably connected to the outer side of the connection between the pressing rod and the connecting rod. The rotating shafts on the left and right sides of the synchronizing rod are rotatably connected to the platform. This pressing component enables the left and right shifting seats to rise and fall synchronously under the drive of the cylinder, ensuring that the two ends of the upper pressing roller are evenly pressurized.

[0008] Preferably, the compaction structure includes a power assembly fastened to the right side of the hood, a flattening roller connected to the middle left side of the power assembly, the left pivot of the flattening roller being disposed through the inside of the first support block, and the right pivot of the flattening roller being disposed through the inside of the second support block. The first support block is slidably connected to the inside of the first through groove, and the second support block is slidably connected to the inside of the second through groove. Guided by the first and second through grooves, the flattening roller can reciprocate along the direction of the through groove under the drive of external force.

[0009] Preferably, the outer surfaces of the flattening roller and the support roller are provided with cylindrical sections arranged at equal intervals, and annular grooves are formed between the cylindrical sections, so that the flattening roller and the support roller form intermittent line contact with the electrode sheet, which enhances the kneading and degassing effect, while avoiding large-area adhesion.

[0010] Preferably, the power assembly includes an upper positioning block and a lower positioning block, both fixed to the right side of the housing on their left sides. A support frame is fixedly connected to the right side of the upper and lower positioning blocks. A first motor is locked and fixed to the middle right side of the support frame, and a second motor is locked and fixed to the rear right side of the support frame. The output ends of the first and second motors are both connected to a transmission unit, which is disposed inside the support frame. A motion unit is fixedly attached to the left end of the transmission unit, and the left end of the motion unit is connected to the flattening roller. By cooperating with the first and second motors to drive the transmission unit, the flattening roller can generate a reciprocating motion perpendicular to the direction of electrode travel.

[0011] Preferably, the transmission unit includes a disc, a worm gear ring coaxially fixed to the middle right side of the disc, the rear side of the worm gear ring meshing with a worm, the top of the worm being connected to the bottom output end of the second motor, a slot seat radially mounted on the left side of the disc, a rocker arm rotating through the middle of the disc and the worm gear ring, the right end of the rocker arm being connected to the left output end of the first motor, and the left end of the rocker arm sliding inside the first sliding frame, the first sliding frame sliding through the slot seat along its length, a protruding post provided in the middle left side of the first sliding frame, the protruding post sliding inside the second sliding frame, the second sliding frame sliding through the left side of the support slot frame, and the left side of the second sliding frame being fastened to the motion unit; the transmission unit converts the rotational motion of the first motor into the linear reciprocating motion of the second sliding frame, and adjusts the spatial orientation of the slot seat through the second motor, thereby changing the amplitude component of the reciprocating motion, realizing the composite motion of the flattening roller in the electrode traveling direction and perpendicular to that direction.

[0012] Preferably, the first sliding frame and the second sliding frame have the same structure, both consisting of a slotted block and a trapezoidal slide. The slotted block and the trapezoidal slide are arranged in a cross shape. The trapezoidal slide of the first sliding frame is parallel to the slotted block of the second sliding frame.

[0013] Preferably, a transverse groove is provided in the middle of the left side of the support frame, and the trapezoidal slide of the second sliding frame slides through the transverse groove. A longitudinal groove is provided in the middle of the left side of the slot seat, and the trapezoidal slide of the first sliding frame slides through the longitudinal groove. Through the constraint of the transverse groove and the longitudinal groove, decoupled sliding in two directions is achieved.

[0014] Preferably, the motion unit includes a housing fastened to the left end of the transmission unit. A third motor is fastened to the front side inside the housing. A protective frame is fixedly connected to the left side of the housing. An inclined rod is connected to the left output end of the third motor, and the inclined rod is rotatably connected to the front side inside the protective frame. A first contact head and a second contact head are respectively slidably contacted on the left and right sides of the rear inclined surface of the inclined rod. The rear parts of the first contact head and the second contact head are both wrapped around the outer surface of the shaft. The left and right sides of the shaft slide through the left and right sides of the protective frame, and the right end of the shaft slides into the inner side of the housing. A connecting rod is fixedly connected to the left end of the shaft, and the left side of the connecting rod is connected to the flattening roller. The motion unit, through the cooperation of the inclined rod and the contact head, converts the rotational motion of the third motor into a high-frequency micro-amplitude reciprocating motion of the shaft and the flattening roller along their own axial direction, superimposing a kneading motion perpendicular to the electrode travel direction on the flattening roller.

[0015] Preferably, a protruding ring is fixedly wrapped around the left side of the outer surface of the connecting rod. The protruding ring is inserted into and rotates on the inner side of the right side of the flattening roller. This allows the connecting rod to drive the flattening roller to move axially back and forth without restricting the free rotation of the flattening roller itself, thus ensuring that it rolls on the surface of the electrode sheet.

[0016] In summary, this application includes the following beneficial technical effects: 1. This application utilizes a compaction structure where a flattening roller, supported by a support roller, simultaneously applies longitudinal rolling and kneading along the travel direction and transverse high-frequency micro-amplitude vibration perpendicular to the travel direction to multiple layers of electrode sheets, forming a two-dimensional planar kneading action. This action can expel and remove micro-bubbles trapped between layers from the electrode sheets in multiple longitudinal and lateral directions, effectively eliminating bubble defects. At the same time, multi-dimensional shear deformation promotes micro-region rearrangement and mechanical interlocking of active material particles at the current collector interface, significantly enhancing interlayer peeling strength and achieving higher interfacial bonding reliability under the same compaction degree.

[0017] 2. The flattening mechanism of this application performs two-dimensional kneading pretreatment on the electrode sheet before it enters the main pressing roller. This can fully relax the multi-directional residual internal stress accumulated in the electrode sheet during the previous processes such as coating and unwinding, and prevent the internal stress from being solidified and locked into the electrode sheet during subsequent pressing and shaping. After the stress is homogenized by kneading, the electrode sheet enters the upper and lower pressing rollers for final normal compaction, which can significantly reduce the tendency of the electrode sheet to warp, bend and other deformations after slitting or winding, and obtain finished electrode sheets with better flatness.

[0018] 3. In the transmission unit of this application, the second motor adjusts the orientation of the slot seat through a worm gear, which can flexibly change the stroke range of longitudinal kneading. Combined with the independent control of the transverse vibration frequency and amplitude by the third motor in the motion unit, the kneading trajectory and intensity can be adjusted and matched according to different material properties and process requirements, making it highly adaptable. The cylindrical sections set on the surface of the flattening roller and the support roller form an intermittent annular line contact, which not only avoids the large-area adhesion of electrode material on the roller surface, but also generates local shearing and extrusion gradients inside the electrode, further enhancing the degassing and densification effect. At the same time, the pressing component ensures uniform pressure at both ends of the upper pressing roller through the synchronous rod frame. The flattening mechanism and the pressing mechanism are arranged in a front-to-back connection, realizing a continuous integrated operation of first kneading and degassing for densification, and then rolling and shaping, resulting in high production efficiency and stable quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of the leveling mechanism in this application; Figure 3 This is a schematic diagram of the power assembly structure of this application; Figure 4 This application Figure 3 A schematic diagram of the structure after removing the upper and lower positioning blocks; Figure 5 This is a schematic diagram of the transmission unit of this application; Figure 6 This application Figure 5 A schematic diagram of the structure after the support frame has been removed; Figure 7 This application Figure 6 A top-view structural diagram; Figure 8 This is a schematic diagram of the motion unit of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Platform; 2. Lower pressing roller; 3. Upper pressing roller; 4. Shifting seat; 5. Pressure rod; 6. Connecting rod; 7. Cylinder; 8. Synchronizing rod frame; 9. Leveling mechanism; 91. Cover chamber; 92. First guide roller assembly; 93. Second guide roller assembly; 94. Support roller; 95. Compaction structure; 96. First through groove; 97. Second through groove; 951. Power assembly; 952. Flattening roller; 953. First support block; 954. Second support block; 9511. Upper positioning block; 9512. Lower positioning block; 9513. Support groove frame; 9514. First Motor; 9515, Second Motor; 9516, Transmission Unit; 9517, Motion Unit; 95161, Disc; 95162, Worm Gear Ring; 95163, Worm; 95164, Slot Seat; 95165, Rocker Arm; 95166, First Sliding Frame; 95167, Second Sliding Frame; 95171, Compartment Seat; 95172, Third Motor; 95173, Protective Frame Seat; 95174, Inclined Rod; 95175, First Contact Head; 95176, Second Contact Head; 95177, Shaft; 95178, Connecting Rod. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail below.

[0022] like Figure 1 As shown, this application provides a pressing device for multilayer composite of battery electrodes, including a frame 1. A lower pressing roller 2 is rotatably connected to the bottom side of the frame 1 via bearings. An upper pressing roller 3 is arranged directly above the lower pressing roller 2. The left and right shaft ends of the upper pressing roller 3 are respectively rotatably connected to the interior of a shift seat 4 via bearings. The two shift seats 4 are respectively embedded in vertical sliding grooves opened in the left and right side walls of the frame 1, and can slide along the longitudinal (vertical) direction. The upper part of the shift seat 4 is connected to a cylinder 7 via a pressing component. The pressing component includes a pressing rod 5, a connecting rod 6, and a synchronizing rod 8. Specifically, a pressing rod 5 is rotatably connected to the top center of the shift seat 4. The pressing rod 5 has a two-piece structure, and its inner upper part is rotatably connected to a pin. There is a connecting rod 6, the top of which is rotatably connected to the piston rod end of the cylinder 7. On the outside of the connecting pin of the pressure rod 5 and the connecting rod 6, there is also a rotatably connected synchronous rod frame 8. The synchronous rod frame 8 is a rigid frame that extends to the left and right. The rotating shafts at its left and right ends are respectively inserted into the corresponding holes of the frame 1 for rotatable connection. When the piston rod of the cylinder 7 extends downward, it pushes the pressure rod 5 through the connecting rod 6. The pressure rod 5 swings around its connection point with the shift seat 4 and presses down on the shift seat 4. At the same time, the synchronous rod frame 8 makes the pressure rods 5 on the left and right sides move synchronously, ensuring that the two shift seats 4 move downward at the same speed and with the same displacement, so that the two ends of the upper pressing roller 3 press evenly onto the multi-layer electrode sheet. With the cooperation of the lower pressing roller 2, a basic pressing force is applied to the electrode sheet and the electrode sheet is pulled forward.

[0023] To improve the composite quality of multilayer electrodes, such as Figure 1 and Figure 2 As shown, a leveling mechanism 9 is provided on the rear side of the test stand 1 (i.e., upstream of the electrode travel direction). The leveling mechanism 9 includes a cover 91. The left and right side walls of the front part of the cover 91 are fixed to the rear side of the test stand 1. A first guide roller 92 is provided on the rear side of the interior of the cover 91, and a second guide roller 93 is provided on the front side of the interior. The first guide roller 92 and the second guide roller 93 are both composed of two parallel and close guide rollers, forming a gap between the upper and lower guide rollers for the passage of multiple layers of electrode sheets. The two guide rollers are on the same horizontal plane, thereby tensioning and guiding the electrode sheets to pass horizontally. On the lower side of the interior of the test stand 1... A support roller 94 is provided, with its rotation axis fixed. The highest point of its roller surface is approximately flush with the highest point of the lower guide roller in the first guide roller 92 and the second guide roller 93, so as to horizontally support the electrode sheet. A compaction structure 95 is provided directly above the support roller 94. A first through groove 96 and a second through groove 97 extending horizontally are respectively opened on the left and right side walls of the cover 91. The two ends of the compaction structure 95 pass through and can slide in the first through groove 96 and the second through groove 97, so that the compaction structure 95 can move back and forth along the electrode sheet traveling direction to reciprocate rolling and kneading the electrode sheet surface.

[0024] The compaction structure 95 includes a power assembly 951, a flattening roller 952, a first support block 953, and a second support block 954. The power assembly 951 is fixed to the right side of the housing 91, and its left-side center output end is connected to the right end of the flattening roller 952. The left-side rotating shaft of the flattening roller 952 is inserted through the first support block 953, and the right-side rotating shaft is inserted through the second support block 954. The first support block 953 is slidably fitted in the first through groove 96, and the second support block 954 is slidably fitted in the second through groove 97. When the power assembly 951 is driven, the flattening roller 952 can reciprocate along the direction of the through groove, and at the same time, the flattening roller 952 itself can rotate freely around its own axis to roll and contact the electrode surface. For example, Figure 2 As shown, the outer surfaces of the flattening roller 952 and the support roller 94 are provided with several equally spaced cylindrical sections, and annular grooves are formed between the cylindrical sections, so that the pressing contact area becomes multiple intermittent annular line contacts. On the one hand, this reduces the actual contact area with the electrode sheet and avoids adhesion; on the other hand, it generates local shearing and extrusion gradients inside the electrode sheet, which is more conducive to degassing and particle rearrangement.

[0025] like Figure 3 and Figure 4As shown, the power assembly 951 includes an upper positioning block 9511, a lower positioning block 9512, a support frame 9513, a first motor 9514, a second motor 9515, a transmission unit 9516, and a motion unit 9517. The left sides of the upper positioning block 9511 and the lower positioning block 9512 are fixed to the right side wall of the cover 91 by screws, while the right side is fixedly connected to the support frame 9513. The first motor 9514 is fixed in the middle of the right side of the support frame 9513, and the second motor 9515 is fixed in the upper rear part of the right side. The output ends of the first motor 9514 and the second motor 9515 are respectively connected to the transmission unit 9516 located inside the support frame 9513. The left end of the transmission unit 9516 extends from the left side of the support frame 9513 and is fastened to the motion unit 9517. The left end of the motion unit 9517 is finally connected to the flattening roller 952.

[0026] like Figures 5 to 7 As shown, the transmission unit 9516 includes a disk 95161. A worm gear ring 95162 is coaxially fixed to the middle right side of the disk 95161. The rear side of the worm gear ring 95162 meshes with a vertically arranged worm 95163. The top shaft end of the worm 95163 is connected to the output end of the second motor 9515. A slot seat 95164 is fixedly mounted radially (i.e., along the diameter) on the left side of the disk 95161. A longitudinal groove is formed inside the slot seat 95164. The disk 95161 and the worm gear ring 95162... A rocker arm 95165 rotates through the central through hole. The right end of the rocker arm 95165 is connected to the left output end of the first motor 9514 via a coupling. The left end of the rocker arm 95165 is an eccentric shaft segment, which is inserted into the slot of the first sliding frame 95166 and can slide along the slot. The first sliding frame 95166 is composed of a slotted block and a trapezoidal slide cross-shaped block. The trapezoidal slide slides in the longitudinal groove of the slot seat 95164. Therefore, the first sliding frame 95166 can only slide along the slot seat. The longitudinal groove of 95164 slides back and forth; a protruding post is provided on the middle left side of the first sliding frame 95166, which is inserted into the slot of the second sliding frame 95167; the second sliding frame 95167 is also composed of a slot block and a trapezoidal slide, and its trapezoidal slide is slidably fitted into the transverse groove opened on the left side wall of the support frame 9513, the direction of which is consistent with the pole piece traveling direction (front and back direction); when the first motor 9514 drives the rocker arm 95165 to rotate, the eccentric shaft section of the rocker arm pushes and pulls the first sliding frame 95164. 66 reciprocates along the longitudinal groove of the slot seat 95164. The first sliding frame 95166 drives the second sliding frame 95167 to reciprocate along the transverse groove through the protruding column, ultimately causing the motion unit 9517 and the flattening roller 952 to move back and forth along the electrode travel direction. At the same time, the second motor 9515 can drive the disk 95161 to rotate through the worm 95163 and the worm wheel ring 95162, thereby changing the radial orientation of the slot seat 95164 and changing the range of the reciprocating distance of the flattening roller 952 in the electrode travel direction.

[0027] like Figure 8 As shown, the motion unit 9517 includes a housing 95171. The right side of the housing 95171 is fastened to the left side of the second sliding frame 95167 by bolts. A third motor 95172 is fixed inside the front side of the housing 95171, and a protective frame 95173 is fixed to the left side of the housing 95171. The left output end of the third motor 95172 is connected to a ramp 95174, which is rotatably supported inside the front side of the protective frame 95173. The ramp 95174 is wrapped with a ramp with an axial tilt angle. The left and right sides of the rear of the ramp are respectively in contact with a first contact head 95175 and a second contact head 95176. Both contact heads are arc surfaces and are respectively fixed to the left and right sides of the outer surface of a shaft 95177. The left and right ends of the shaft 95177 can slide through the left and right side walls of the protective frame 95173, and its right end extends into the housing. The shaft 95177 is internally and slidingly fitted; the left end of the shaft 95177 is fixedly connected to the connecting rod 95178, and the left end of the connecting rod 95178 is connected to the right end of the flattening roller 952; specifically, the left side of the outer surface of the connecting rod 95178 is provided with a convex ring, which is inserted into the annular groove at the right end of the flattening roller 952 to achieve a rotatable connection, so that the connecting rod 95178 can drive the flattening roller 952 to move along its axial direction, without affecting the rotation of the flattening roller 952; when the third motor 95172 drives the inclined rod 95174 to rotate, the high point and low point of the inclined plane alternately push the first contact head 95175 and the second contact head 95176, forcing the shaft 95177 together with the connecting rod 95178 and the flattening roller 952 to perform axial reciprocating motion, the direction of motion being perpendicular to the direction of electrode travel (i.e., transverse), the frequency of this motion is determined by the speed of the third motor 95172, and the amplitude is determined by the lift of the inclined plane, which can realize high-frequency micro-amplitude transverse kneading.

[0028] The working principle of this device is as follows: First, the multi-layer electrode enters from the first guide roller 92 behind the shroud 91, and after being held flat by the upper and lower guide rollers, it passes horizontally above the support roller 94 and is discharged by the second guide roller 93 on the front side, and is conveyed towards the platform 1. The roller surface of the support roller 94 is flush with the lower roller surface of the guide roller, providing stable bottom support and tension for the electrode under the compaction structure 95.

[0029] Secondly, in the power assembly 951 of the compaction structure 95, the first motor 9514 drives the rocker arm 95165 to rotate. The eccentric shaft section of the rocker arm 95165 slides back and forth along the longitudinal groove of the slot seat 95164 via the first sliding frame 95166, and drives the second sliding frame 95167 to make linear reciprocating motion along the transverse groove of the support frame 9513 via the protruding column. This drives the motion unit 9517 and the flattening roller 952 to move back and forth along the direction of electrode travel. Under the support of the support roller 94, the electrode surface is longitudinally rolled and kneaded. At the same time, the second motor 9515 can drive the disc 95161 to rotate through the worm gear 95163 and the worm wheel ring 95162, changing the radial orientation of the slot seat 95164, thereby adjusting the stroke range of the longitudinal reciprocating motion to match different kneading requirements.

[0030] Third, the third motor 95172 of the motion unit 9517 drives the inclined rod 95174 to rotate. Its outer inclined surface alternately pushes the first contact head 95175 and the second contact head 95176 on the shaft 95177, forcing the shaft 95177 and the connecting rod 95178 to drive the flattening roller 952 to generate high-frequency micro-amplitude reciprocating vibration along its own axial direction (i.e., perpendicular to the direction of electrode travel), forming a transverse kneading. This transverse vibration and longitudinal kneading are superimposed at the same time to produce a two-dimensional planar kneading effect, effectively expelling interlayer bubbles and promoting the rearrangement of active material particles.

[0031] Fourth, after the multi-layered electrode sheet, which has been kneaded by the leveling mechanism 9, is led out by the second guide roller 93, it enters the lower pressing roller 2 and the upper pressing roller 3 in the frame 1. The cylinder 7 drives the two shift seats 4 on the left and right sides to move down synchronously through the pressing component composed of the pressing rod 5, the connecting rod 6 and the synchronous rod frame 8, so that the upper pressing roller 3 presses the electrode sheet evenly, and works with the lower pressing roller 2 to apply the basic normal pressing force, complete the final pressing and shaping and pull the electrode sheet forward continuously.

[0032] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressing device for multilayer composite of battery electrode sheets, comprising a frame (1), wherein a lower pressing roller (2) is rotatably connected to the bottom side inside the frame (1), an upper pressing roller (3) is provided above the lower pressing roller (2), the left and right sides of the upper pressing roller (3) are respectively rotatably connected to the inside of a shift seat (4), the two shift seats (4) are respectively longitudinally slidably connected to the left and right sides of the frame (1), and the top of each of the two shift seats (4) is connected to a cylinder (7) through a pressing member; Its features are: The platform (1) is provided with a flattening mechanism (9) for kneading and bonding multilayer electrodes on the rear side. The flattening mechanism (9) includes a cover (91) fixed to the platform (1) on the left and right sides of the front part. The cover (91) is provided with a first guide roller (92) and a second guide roller (93) on the rear and front sides respectively. The first guide roller (92) and the second guide roller (93) are located on the same horizontal plane and are composed of upper and lower guide rollers respectively. The platform (1) is provided with a support roller (94) on the lower middle side. The support roller (94) corresponds to the guide roller position of the first guide roller (92) and the second guide roller (93) located below. A compaction structure (95) is provided above the support roller (94). The left and right side walls of the cover (91) are provided with a first through groove (96) and a second through groove (97) respectively. The compaction structure (95) is provided through the inside of the first through groove (96) and the second through groove (97). The compaction structure (95) includes a power assembly (951) fastened to the right side of the hood (91). A flattening roller (952) is connected to the middle left side of the power assembly (951). The left pivot of the flattening roller (952) is inserted through the inside of the first support block (953), and the right pivot of the flattening roller (952) is inserted through the inside of the second support block (954). The first support block (953) is slidably connected to the inside of the first through groove (96), and the second support block (954) is slidably connected to the inside of the second through groove (97). The power assembly (951) includes an upper positioning block (9511) and a lower positioning block (9512) both fixed to the right side of the hood (91) on the left side. The upper positioning block (9511) and the lower positioning block (9512) are fixedly connected to the right side of the support frame (9513). The middle right side of the support frame (9513) is locked with a first motor (9514), and the rear right side of the support frame (9513) is locked with a second motor (9515). The output ends of the first motor (9514) and the second motor (9515) are both connected to the transmission unit (9516), and the transmission unit (9516) is installed inside the support frame (9513). The left end of the transmission unit (9516) is fixed with a motion unit (9517), and the left end of the motion unit (9517) is connected to the flattening roller (952). The transmission unit (9516) includes a disc (95161), on the right side of which a worm gear ring (95162) is coaxially fixed. The rear side of the worm gear ring (95162) meshes with a worm (95163). The top of the worm (95163) is connected to the bottom output end of the second motor (9515). A slot seat (95164) is mounted radially on the left side. A rocker arm (95165) is rotatably inserted through the middle of the disc (95161) and the worm gear ring (95162). The right end of the rocker arm (95165) is connected to the left output end of the first motor (9514). The left end of the rocker arm (95165) is inserted and slidably inserted into the first sliding frame (95166). The first sliding frame (95166) slides through the slot seat (95164) along its length. A protruding post is provided in the middle of the left side of the first sliding frame (95166). The protruding post is inserted and slidably inserted into the inner side of the second sliding frame (95167). The second sliding frame (95167) slides through the left side of the support slot frame (9513), and the left side of the second sliding frame (95167) is fastened to the motion unit (9517).

2. The pressing device for multilayer composite of battery electrodes according to claim 1, characterized in that: The pressing component includes a pressing rod (5) rotatably connected to the top center of the shift seat (4). The pressing rod (5) is in the shape of two pieces, with a connecting rod (6) rotatably connected to the upper inner side. The top side of the connecting rod (6) is rotatably connected to the bottom output shaft of the cylinder (7). A synchronizing rod frame (8) is rotatably connected to the outer side of the connection between the pressing rod (5) and the connecting rod (6). The rotating shafts on the left and right sides of the synchronizing rod frame (8) are rotatably connected to the platform (1).

3. The pressing device for multilayer composite of battery electrodes according to claim 1, characterized in that: The outer surfaces of the flattening roller (952) and the support roller (94) are provided with cylindrical sections arranged at equal intervals.

4. The pressing device for multilayer composite of battery electrodes according to claim 1, characterized in that: The first sliding frame (95166) and the second sliding frame (95167) have the same structure, both consisting of a slotted block and a trapezoidal slide. The slotted block and the trapezoidal slide are arranged in a cross shape. The trapezoidal slide of the first sliding frame (95166) is parallel to the slotted block of the second sliding frame (95167). The slotted block of the first sliding frame (95166) is parallel to the trapezoidal slide of the second sliding frame (95167).

5. The pressing device for multilayer composite of battery electrodes according to claim 4, characterized in that: The support frame (9513) has a horizontal groove in the middle of its left side, and the trapezoidal slide of the second sliding frame (95167) slides through the horizontal groove. The slot seat (95164) has a vertical groove in the middle of its left side, and the trapezoidal slide of the first sliding frame (95166) slides through the vertical groove.

6. The pressing device for multilayer composite of battery electrodes according to claim 1, characterized in that: The motion unit (9517) includes a housing (95171) fastened to the left end of the transmission unit (9516). A third motor (95172) is fastened to the front side inside the housing (95171). A protective frame (95173) is fixedly connected to the left side of the housing (95171). A ramp (95174) is connected to the left output end of the third motor (95172), and the ramp (95174) is rotatably connected to the front side inside the protective frame (95173). The left and right sides of the ramp at the rear of the ramp (95174) respectively contact and slide with the third motor. A first contact head (95175) and a second contact head (95176) are provided. The rear parts of the first contact head (95175) and the second contact head (95176) are both wrapped around the outer surface of the shaft (95177). The left and right sides of the shaft (95177) slide through the left and right sides of the guard frame seat (95173) respectively. The right end of the shaft (95177) is inserted and slidably inserted into the inner side of the bin seat (95171). The left end of the shaft (95177) is fixedly connected to a connecting rod (95178). The left side of the connecting rod (95178) is connected to the flattening roller (952).

7. The pressing device for multilayer composite of battery electrodes according to claim 6, characterized in that: A protruding ring is fixedly wrapped around the left side of the outer surface of the connecting rod (95178), and the protruding ring is inserted into the inner side of the right side of the flattening roller (952).

Images