Battery cell extrusion device

Abstract

The invention discloses a battery core extrusion device, and relates to the technical field of extrusion equipment, the battery core extrusion device comprises a machine base, a machine head, an extrusion head, an extrusion die and a conveying device, a group of supports are fixedly arranged on the conveying device, and the extrusion die is rotatably mounted between the two supports; an overturning positioning mechanism is arranged between the machine head and the extrusion die, and after the machine head completes one-time extrusion action, the extrusion die is driven to overturn by 180 degrees. Through the overturning design of the extrusion die, the problem that an end cover and the inner wall of a die cavity are damaged due to friction is solved, so that the consistency of the shape and the size of a product is guaranteed, and the production efficiency is improved. The end cover can be rapidly and smoothly discharged after being extruded, additional operation and adjustment are not needed, the product quality is guaranteed, the extrusion die designed in an overturning mode is adopted, the extrusion process and the end cover discharging are carried out respectively, the continuous production continuity can be improved, the production period is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of extrusion equipment, and in particular to a battery core extrusion device. Background Art

[0002] With the rapid development of the automotive energy and electric vehicle industries, lithium batteries are increasingly being used in new energy vehicles. Usually, a battery pack is formed by stacking several battery cells into groups and then encapsulating the battery cell modules. Usually, after the battery cells are stacked, a battery cell extrusion device is required to compress the battery cells.

[0003] Traditional battery cell extrusion devices generally compress the stacked battery cells by squeezing them downward from one side. During the extrusion process, the battery cells are easily damaged due to uneven force, which reduces the battery pack. Due to the elasticity and tension of the battery cells, the straight part of the end cap will be stuck in the mold cavity, making it difficult to remove it smoothly after the extrusion is completed. Additional operations and adjustments are required. Usually, the end cap is pushed out of the mold cavity using an additional cylinder in the mold groove. However, the friction between the end cap and the mold cavity often causes scratches on the outer wall of the end cap. It may also cause deformation or damage to the end cap due to excessive force on the cylinder push point, affecting product quality and increasing production costs and scrap rates. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that after the end cover is extruded, it is ejected by a cylinder, which often causes scratches on the outer wall of the end cover and causes deformation or damage to the end cover, thereby affecting product quality, and to propose a battery cell extrusion device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A battery cell extrusion device comprises a machine base, a machine head, an extrusion head, an extrusion die and a conveying device, wherein a group of brackets are fixedly arranged on the conveying device, and the extrusion die is rotatably installed between two brackets;

[0007] A flip positioning mechanism is provided between the die head and the extrusion die, and after the die head completes an extrusion action, the extrusion die is driven to flip 180°;

[0008] The extrusion die comprises:

[0009] An extrusion sleeve is rotatably arranged on the bracket, and a mounting opening is provided through the center of the extrusion sleeve, and the mounting opening corresponds to the position of the extrusion head;

[0010] A mold core is slidably disposed in the installation opening, and a buffer positioning structure is disposed between the mold core and the extrusion sleeve;

[0011] Four movable modules, the movable modules are slidably arranged on the mold core, the four movable modules are distributed in a circular array around the axis of the mold core, and when one end of the movable module moves to an extreme position, a mold cavity adapted to the extrusion head is formed;

[0012] Two sets of centering mechanisms are symmetrically distributed on the upper and lower end surfaces of the extrusion sleeve and are used to align the battery core to be extruded with the installation opening.

[0013] Preferably, the movable module comprises an arc-shaped rod and mold pieces fixedly mounted at both ends of the arc-shaped rod, four slideways are penetrated through the mold core, the arc-shaped rod is slidably arranged in the slideways and both ends of the arc-shaped rod are bent outwards.

[0014] Preferably, a limiting groove is provided on the side wall of the arc-shaped rod, and a limiting strip adapted to the limiting groove is provided on the inner wall of the slideway. A plurality of rollers are installed in the limiting strip, and the rollers are tightly pressed against the inner wall of the limiting groove.

[0015] Preferably, an installation cavity with a cross-shaped cross-section is opened in the mold core, and a movable frame that can slide along the axial direction of the mold core is installed in the installation cavity, racks are arranged on the four outer sides of the movable frame, and the convex surface of the arc rod is arranged with teeth. Four gears are rotatably arranged in the mold core, and the gears correspond to the racks and the arc rod one by one and mesh with each other.

[0016] Preferably, the buffer positioning structure includes a positioning rod fixedly arranged on the outer wall of the mold core, a positioning cavity is opened in the extrusion sleeve, the positioning rod extends into the positioning cavity and is slidably connected to the positioning cavity, and buffer springs are arranged at both ends of the positioning rod.

[0017] Preferably, the flip positioning mechanism includes a control plate fixedly arranged on the machine head, a control gear is sleeved on the extrusion sleeve rotating shaft, a one-way bearing is arranged between the control gear and the extrusion sleeve rotating shaft, a control rack is fixedly arranged on the inner side wall of the control plate, the control gear and the control rack are intermittently meshed, a positioning slot is vertically opened on the control plate, a positioning piece is fixedly arranged on the side wall of the extrusion sleeve rotating shaft, the positioning piece is consistent with the positioning slot width, and a reversing slot is arranged at the bottom of the positioning slot, and the control rack and the reversing slot are positioned coincidently.

[0018] Preferably, a rounded corner is provided at the junction between the positioning notch and the reversing notch.

[0019] Preferably, the centering mechanism includes a plurality of mounting grooves evenly arranged on the end surface of the extrusion sleeve, a slider is slidably arranged in the mounting groove, a compression spring is arranged between the slider and the mounting groove, a push plate extending out of the mounting groove is fixedly arranged on the top of the slider, a mounting frame is provided on the extrusion head, a plurality of insertion rods corresponding to the push plates are fixedly arranged on the side wall of the mounting frame, a socket is arranged on the push plate, and when the compression spring is in the initial state, the insertion rod corresponds to the socket.

[0020] Preferably, a side surface of the insertion hole close to the compression spring is a wedge-shaped surface, and a bottom surface of the insertion rod is an inclined surface corresponding to the wedge-shaped surface.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention adopts the flipping design of the extrusion die. After the extrusion die is flipped, the movable die slides downward, so that the end cap is turned to the bottom of the extrusion die after extrusion is completed, and the corresponding die sheet is unfolded, so that the cavity space becomes larger, and the end cap is no longer directly dropped by the tension of the battery cell, which makes it easy to remove the end cap from the cavity, solves the problem of friction damage between the end cap and the inner wall of the cavity, thereby ensuring the consistency of the shape and size of the product. After extrusion is completed, the end cap can be quickly and smoothly discharged without additional operation and adjustment, thereby ensuring product quality.

[0023] 2. After the extrusion die is turned over, the die piece turned to the upper side moves downward with the die core under the action of gravity to be gathered and enter the installation port to form a new die cavity, which is carried out separately from the discharge of the end cover, which is beneficial to improving the continuity of continuous production, thereby greatly shortening the production cycle and improving production efficiency.

[0024] 3. The present invention provides a centering mechanism. During extrusion, when the pressure head moves down but has not yet contacted the battery cell to be extruded, the slider is driven to gather toward the center of the mold core by the insertion rod, so as to position and align the battery cell to be extruded, thereby further improving the accuracy and quality of the product, ensuring that the battery cell to be extruded maintains the correct position during the extrusion process, and avoiding the problem of product size deviation or irregular shape caused by inaccurate battery cell position. In this way, the scrap rate can be effectively reduced, the consistency and quality stability of the product can be improved, the use of manual labor can be reduced, and the labor intensity and safety risks can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the end cover of the pressure vessel;

[0026] Figure 2 This is a schematic diagram of the overall structure of a battery cell extrusion device proposed by the present invention;

[0027] Figure 3This is a schematic structural diagram of an extrusion die in a battery cell extrusion device proposed by the present invention;

[0028] Figure 4 This is a structural schematic diagram of a control board in a battery cell extrusion device proposed by the present invention;

[0029] Figure 5 A schematic diagram of the explosion structure of an extrusion sleeve in a battery cell extrusion device proposed by the present invention;

[0030] Figure 6 A schematic diagram of the explosion structure of a mold core in a battery core extrusion device proposed by the present invention;

[0031] Figure 7 A schematic diagram of the structure of a movable module in a battery cell extrusion device proposed by the present invention;

[0032] Figure 8 for Figure 6 A magnified view of part A;

[0033] Fig. 9 It is a schematic diagram of the top view of the extrusion die in the present invention;

[0034] Fig.10 for Fig. 9 The cross-section shown in BB;

[0035] Fig.11 for Fig. 9 The cross-section shown in CC;

[0036] Fig.12 This is a structural schematic diagram of the centering mechanism state 1 proposed by the present invention;

[0037] Fig.13 This is a structural schematic diagram of state 2 of the centering mechanism proposed by the present invention.

[0038] In the figure: 1. base; 2. head; 21. control board; 211. control rack; 212. positioning notch; 213. reversing notch; 3. extrusion head; 4. extrusion die; 41. extrusion sleeve; 411. control gear; 412. positioning sheet; 42. core; 421. slideway; 422. roller; 423. movable frame; 4231. rack; 424. gear; 425. positioning rod; 426. buffer spring; 43. movable module; 431. arc rod; 432. die; 433. teeth; 44. centering mechanism; 441. slider; 442. compression spring; 443. push plate; 444. jack; 5. conveying equipment; 6. plug rod. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] Reference Figure 2 A battery cell extrusion device comprises a machine base 1, a machine head 2, an extrusion head 3, an extrusion die 4 and a conveying device 5. The machine head 2 can move up and down on the machine base 1. A hydraulic cylinder is installed on the machine head 2. The extrusion head 3 is fixedly installed at the telescopic end of the machine head 2 and is arranged vertically downward. The extrusion die 4 is located between the extrusion head 3 and the conveying device 5. The positions of the extrusion die 4 and the extrusion head 3 correspond. During the extrusion process, the battery cell to be extruded is placed above the extrusion die 4, and the machine head 2 is driven to move downward to drive the extrusion head 3 close to the battery cell. When the hydraulic cylinder is started, the extrusion head 3 cooperates with the extrusion die 4 to extrude the battery cell.

[0042] Reference Figure 2-13 A group of brackets are fixedly arranged on the conveying device 5, and the extrusion die 4 is rotatably installed between the two brackets. The extrusion die 4 can be flipped under the support of the brackets. A flip positioning mechanism is arranged between the machine head 2 and the extrusion die 4. After the machine head 2 completes an extrusion action, the extrusion die 4 is driven to flip 180°. Therefore, during extrusion, the battery cell is located above the extrusion die 4. After the extrusion is completed, the extrusion die 4 is flipped, and the end cap formed by the extrusion of the battery cell is transferred to the bottom of the extrusion die 4. The existing extrusion method is generally a cyclic process of discharging-extruding-taking out-discharging. Through the extrusion manufacturing device, by flipping the extrusion die 4, the processing process of taking out the parts is omitted, and the additional operations and adjustments are reduced, which is conducive to improving the continuity of continuous production, thereby greatly shortening the production cycle and improving production efficiency.

[0043] In order to realize the above process, both ends of the extrusion die 4 need to be suitable for extrusion operations. The specific design method is as follows: the extrusion die 4 includes an extrusion sleeve 41, a mold core 42, four movable modules 43 and two sets of centering mechanisms 44. The extrusion sleeve 41 is used to support the extrusion die 4 and realize the flipping function of the extrusion die 4. The mold core 42 and the movable module 43 cooperate with each other to cooperate with the flipping of the extrusion die 4 to change the mold cavity so as to achieve the purpose of continuous extrusion.

[0044] The extrusion sleeve 41 is rotatably arranged on the bracket, and a mounting opening is provided through the center of the extrusion sleeve 41 , and the mounting opening corresponds to the position of the extrusion head 3 .

[0045] Reference Figure 2-13 The flip positioning mechanism includes a control board 21 fixedly arranged on the machine head 2, the control board 21 is arranged vertically downward, a control gear 411 is sleeved on the rotating shaft of the extrusion sleeve 41, and a one-way bearing is arranged between the control gear 411 and the rotating shaft of the extrusion sleeve 41. Under the action of the one-way bearing, a one-way locking is achieved between the control gear 411 and the rotating shaft of the extrusion sleeve 41. The control gear 411 only allows the one-way driving of the extrusion sleeve 41 to rotate. When the control gear 411 drives the extrusion sleeve 41 in the reverse direction, the inner ring and the outer ring of the one-way bearing cannot be effectively transmitted. The cross section of the control board 21 is U-shaped, and the inner wall of the control board 21 is solid. A control rack 211 is fixedly provided, and the control gear 411 is intermittently meshed with the control rack 211. A positioning notch 212 is vertically opened on the control plate 21. A positioning piece 412 is fixedly provided on the side wall of the rotation shaft of the extrusion sleeve 41. The positioning piece 412 has the same width as the positioning notch 212. When the positioning piece 412 coincides with the positioning notch 212, the positioning piece 412 can enter the positioning notch 212 and slide in the positioning notch 212. When the positioning piece 412 is located inside the positioning notch 212, the rotation shaft of the extrusion sleeve 41 is limited by the action of the positioning piece 412 and the positioning notch 212, so as to prevent the extrusion sleeve 41 from being squeezed. Deflection occurs, and a reversing notch 213 is provided at the bottom of the positioning notch 212, the control rack 211 coincides with the reversing notch 213, the length of the control rack 211 is less than the length of the reversing notch 213, due to the existence of the positioning piece 412 and the positioning notch 212, only when the positioning piece 412 enters the reversing notch 213, the extrusion sleeve 41 shaft can be rotated, driving the extrusion sleeve 41 to reverse, the effective number of teeth of the control rack 211 is equal to half of the control gear 411, and after the control gear 411 cooperates with the control rack 211 for an effective stroke, the control gear 41 The rotation angle is 180°. Since the control rack 211 is located in the reversing notch 213, the meshing relationship between the control gear 411 and the control rack 211 is exactly connected with the matching relationship between the positioning piece 412 and the positioning notch 212. When the control gear 411 is meshed with the control rack 211, the positioning piece 412 is disengaged from the positioning notch 212. When the control gear 411 is disengaged from the control rack 211, the positioning piece 412 enters the positioning notch 212. The connection between the positioning notch 212 and the reversing notch 213 is provided with a rounded corner, so that the positioning piece 412 is more accurately connected and enters the positioning notch 212.

[0046] The reversing notch 213 is located below the control board 21, and the positioning notch 212 runs through the reversing notch 213. The specific process of realizing the precise 180° flipping of the extrusion sleeve 41 is as follows: the machine head 2 is first located at the top of the machine base 1, and the positioning piece 412 is initially located in the positioning notch 212 below the reversing notch 213. At this time, the control gear 411 and the control rack 211 are in a disengaged state, and the control board 21 moves downward with the machine head 2 until the control gear 411 is meshed with the control rack 211. However, under the action of the one-way bearing, the control gear 411 idles, and the extrusion sleeve 41 maintains its original state until the positioning piece 412 is stuck in the positioning notch 212 above the reversing notch 213 to keep the position of the extrusion sleeve 41 stable. After the extrusion head 3 completes extrusion, the machine head 2 drives the extrusion head 3 and the control board 21 to move up and reset. After the machine head 2 and the extrusion head 3 are pulled away from the extrusion die 4 by a certain space, the positioning piece 412 disengages from the positioning slot 212 and enters the reversing slot 213. At the same time, the control gear 411 engages with the control rack 211, and at this time, the one-way bearing is effectively transmitted. After the control gear 411 drives the extrusion sleeve 41 to flip 180°, the control gear 411 disengages from the control rack 211 again, and the positioning piece 412 enters the positioning slot 212 below the reversing slot 213. The extrusion sleeve 41 remains in the state of being precisely flipped 180° and reset. The machine head 2 and the extrusion head 3 return to the initial state. After flipping, the mounting port on the extrusion sleeve 41 still remains coaxial with the extrusion head 3.

[0047] The mold core 42 is slidably arranged in the installation opening, and both ends of the mold core 42 are provided with spherical depressions that are adapted to the shape of the movable module 43, and a buffer positioning structure is arranged between the mold core 42 and the extrusion sleeve 41. Under the action of the buffer positioning structure, the mold core 42 is only allowed to perform axial movement within a lower range and cannot rotate, and the buffer positioning structure provides buffering during the axial movement.

[0048] Reference Figure 2-13 The buffer positioning structure includes a positioning rod 425 fixedly arranged on the outer wall of the mold core 42, and a plurality of positioning rods 425 are arranged. A positioning cavity is opened in the extrusion sleeve 41. The positioning rod 425 extends into the positioning cavity and is slidably connected with the positioning cavity. Buffer springs 426 are arranged at both ends of the positioning rod 425. The two buffer springs 426 control the mold core 42 to be in the center position of the extrusion sleeve 41, but move downward under the gravity of the mold core 42, so that the upper part of the installation port is exposed. At the same time, the mold core 42 will compress the buffer spring 426 located below until the positioning rod 425 is pressed against the side wall of the positioning cavity.

[0049] The movable module 43 is slidably arranged on the mold core 42. Four movable modules 43 are distributed in a circular array around the axis of the mold core 42. When one end of the movable module 43 moves to the extreme position, a mold cavity adapted to the extrusion head 3 is formed, and the other end is in an open state.

[0050] The movable module 43 includes an arc rod 431 and mold pieces 432 fixedly installed at both ends of the arc rod 431. The four mold pieces 432 form a mold cavity consistent with the shape of the end cover when combined. Four slideways 421 are opened through the mold core 42. The arc rod 431 is slidably set in the slideway 421 and the two ends of the arc rod 431 are bent outward. Since the two ends of the arc rod 431 are bent outward, when the arc rod 431 slides in the slideway 421, the positions of the mold pieces 432 at both ends of the arc rod 431 are constantly changing. When the mold piece 432 at one end is gathered, the mold piece 432 at the other end must be opened outward. When the mold pieces 432 are gathered to the limit state, that is, when the mold pieces 432 are aggregated to form a mold cavity, the side surfaces of the aggregated four mold pieces 432 form a cylindrical shape and are coaxial with the installation port. Therefore, the gathered mold pieces 432 can slide downward along the mold core 42 into the installation port, so that the installation port applies an external protective force to the mold pieces 432 , ensuring that the gathered state of the mold piece 432 remains stable during the extrusion process. When the extrusion is completed and the extrusion sleeve 41 is flipped 180°, the mold core 42 comes to the upper half of the extrusion sleeve 41 as it flips, and at this time the mold core 42 slides downward, causing the mold piece 432 originally located in the installation opening to slide downward and out of the installation opening. The originally opened mold piece 432 gradually closes as the mold core 42 moves downward and presses against the outer edge of the installation opening. At the same time, the subsequent battery cells to be extruded are placed, and the gravity of the battery cells will also act on the mold piece 432, causing the arc rod 431 to slide downward, prompting the mold piece 432 to close until it enters the installation opening. At this time, the extruded mold piece 432 is flipped to the bottom and is located above the conveying device 5. As the arc rod 431 moves downward, the mold piece 432 extending out of the installation opening expands outward, and the processed end cap falls directly on the conveying device 5 for transportation, which solves the problem of friction damage between the end cap and the inner wall of the mold cavity and ensures the consistency of the shape and size of the product.

[0051] A limiting groove is provided on the side wall of the arc rod 431, and a limiting strip adapted to the limiting groove is provided on the inner wall of the slide 421. A plurality of rollers 422 are installed in the limiting strip, and the rollers 422 are tightly pressed against the inner wall of the limiting groove. The limiting groove cooperates with the limiting strip to prevent the arc rod 431 from unnecessary shaking or deviation during movement, and under the action of the rollers 422, friction can be reduced and the service life can be extended.

[0052] Reference Figure 2-13, a mounting cavity with a cross-shaped cross section is provided in the mold core 42, and a movable frame 423 which can slide axially along the mold core 42 is installed in the mounting cavity, and the cross-sectional profile of the movable frame 423 is consistent with the cross-sectional profile of the mounting cavity, so as to ensure that the movable frame 423 can move stably in the mounting cavity, and racks 4231 are provided on the four outer sides of the movable frame 423, and teeth 433 are provided on the convex surface of the arc rod 431. Four gears 424 are rotatably arranged in the mold core 42, and the gears 424 correspond to and mesh with the racks 4231 and the arc rod 431 one by one. When the arc rod 431 slides, the driving gear 424 rotates, and the rack 4231 is driven by the gear 424 to move the movable frame 423, and the rotation angles of the gears 424 are kept consistent through the movement of the movable frame 423, so as to ensure that the displacement distances of the arc rods 431 are consistent, so as to ensure that the arc rods 431 can move synchronously, and the opening and closing angles of the mold pieces 432 at both ends of the arc top rod are kept synchronous.

[0053] The two sets of centering mechanisms 44 are symmetrically distributed on the upper and lower end surfaces of the extrusion sleeve 41, and are used to align the battery cell to be extruded with the installation port. When the extrusion head 3 is extruding, it is ensured that the battery cell to be extruded maintains the correct position during the extrusion process, avoiding the problem of product size deviation or irregular shape caused by inaccurate battery cell position, which can effectively reduce the scrap rate and improve the consistency and quality stability of the product.

[0054] The centering mechanism 44 includes a plurality of mounting grooves uniformly opened on the end surface of the extrusion sleeve 41, a slider 441 is slidably arranged in the mounting groove, a compression spring 442 is arranged between the slider 441 and the mounting groove, the slider 441 is located at the outermost side of the mounting groove under the action of the compression spring 442, a push plate 443 extending out of the mounting groove is fixedly arranged on the top of the slider 441, the battery cell to be extruded is placed above the extrusion sleeve 41, and the battery cell is pushed to move toward the center of the extrusion sleeve 41 through the synchronous displacement of the push plate 443 until the battery cell and the mold core 42 maintain a concentric state, a mounting frame is sleeved on the extrusion head 3, a plurality of plug rods 6 corresponding to the push plate 443 are fixedly arranged on the side wall of the mounting frame, and a plug hole 44 is opened on the push plate 443 4. When the compression spring 442 is in the initial state, the insertion rod 6 corresponds to the insertion hole 444. During extrusion, the extrusion head 3 moves downward. When the extrusion head 3 has not yet contacted the battery cell, the insertion rod 6 is inserted into the insertion hole 444. The side of the insertion hole 444 close to the compression spring 442 is a wedge-shaped surface, and the bottom surface of the insertion rod 6 is an inclined surface corresponding to the wedge-shaped surface. The inclined surface of the insertion rod 6 presses the wedge-shaped surface of the insertion hole 444 to move the slider 441 toward the center of the mold core 42, pushing the battery cell for alignment until the insertion rod 6 completes passing through the insertion hole 444 and the alignment is completed. At the same time, the extrusion head 3 presses the battery cell for extrusion. No manual labor is required for operation, which reduces the use of manual labor and reduces labor intensity and safety risks.

[0055] It should be noted that the movable frame 423, rack 4231, gear 424, etc. are all located inside the mold core 42, and the mold core 42 is also installed inside the extrusion sleeve 41. In order to facilitate production and processing as well as installation and debugging of the device, the extrusion sleeve 41 and the mold core 42 are both manufactured by three-section splicing and fixed by screws.

[0056] The specific working principle of the present invention is as follows:

[0057] When the present invention is used, the four mold pieces 432 located above the extrusion sleeve 41 are combined to form a mold cavity consistent with the shape of the end cover. The gathered mold pieces 432 slide downward with the mold core 42 into the installation port, and the battery cell to be extruded is placed on the extrusion sleeve 41 and in the area between the four push plates 443. First, the machine head 2 is controlled to move downward until the positioning piece 412 is stuck in the bottom of the positioning notch 212, and the hydraulic cylinder installed on the machine head 2 is started to move the extrusion head 3 downward. Before the extrusion head 3 contacts the battery cell, the insertion rod 6 is inserted into the insertion hole 444, and the inclined surface of the insertion rod 6 presses the wedge surface of the insertion hole 444 to move the slider 441 toward the center of the mold core 42, pushing the battery cell for alignment, until the insertion rod 6 completes passing through the insertion hole 444, and the alignment is completed, and at the same time, the extrusion head 3 presses the battery cell for extrusion;

[0058] After the punching is completed, the hydraulic cylinder is controlled to retract, and the extrusion head 3 is separated from the battery cell. The battery cell is stuck in the mold cavity due to the tension of the outward expansion after deformation. The machine head 2 is controlled to move upward and reset. After the machine head 2 and the extrusion head 3 are pulled apart from the extrusion die 4 by a certain space, the positioning piece 412 is separated from the positioning notch 212 and enters the reversing notch 213. At the same time, the control gear 411 is meshed with the control rack 211, and the one-way bearing is effectively transmitted at this time. After the control gear 411 drives the extrusion sleeve 41 to flip 180°, the control gear 411 is separated from the control rack 211 again, and the positioning piece 412 enters the positioning notch 212 below the reversing notch 213, and the extrusion sleeve 41 After accurately flipping 180°, the state is reset, and the machine head 2 and the extrusion head 3 return to the initial state. At this time, the mold core 42 slides downward, so that the mold piece 432 originally located in the installation opening slides downward out of the installation opening. The mold piece 432 in the original open state gradually closes with the downward movement of the mold core 42 and the outer edge of the installation opening. At the same time, the subsequent battery cell to be extruded is placed, and the gravity of the battery cell will also act on the mold piece 432, so that the arc rod 431 slides downward, prompting the mold piece 432 to close until it enters the installation opening. As the arc rod 431 moves downward, the mold piece 432 extending out of the installation opening expands outward, and the processed end cap directly falls on the conveying device 5 for transportation;

[0059] After turning over, the mounting opening on the extrusion sleeve 41 still maintains a coaxial state with the extrusion head 3, and the above process is repeated for continuous extrusion.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery cell extrusion device, comprising a base (1), a head (2), an extrusion head (3), an extrusion die (4) and a conveying device (5), characterized in that: A group of brackets are fixedly arranged on the conveying device (5), and the extrusion die (4) is rotatably installed between two brackets; A flip positioning mechanism is provided between the die head (2) and the extrusion die (4), and after the die head (2) completes an extrusion action, the extrusion die (4) is driven to flip 180 degrees; The extrusion die (4) comprises: An extrusion sleeve (41) is rotatably mounted on the bracket, and a mounting opening is provided through the center of the extrusion sleeve (41), and the mounting opening corresponds to the position of the extrusion head (3); A mold core (42) is slidably disposed in the installation opening, and a buffer positioning structure is disposed between the mold core (42) and the extrusion sleeve (41); Four movable modules (43), the movable modules (43) being slidably disposed on the mold core (42), the four movable modules (43) being distributed in a circular array around the axis of the mold core (42), and forming a mold cavity adapted to the extrusion head (3) when one end of the movable module (43) moves to an extreme position; Two sets of centering mechanisms (44) are symmetrically distributed on the upper and lower end surfaces of the extrusion sleeve (41) and are used to align the battery core to be extruded with the installation opening.

2. A battery cell extrusion device according to claim 1, characterized in that: The movable module (43) comprises an arc-shaped rod (431) and mold pieces (432) fixedly mounted at both ends of the arc-shaped rod (431); four slideways (421) are provided through the mold core (42); the arc-shaped rod (431) is slidably arranged in the slideways (421) and both ends of the arc-shaped rod (431) are bent outward.

3. A battery cell extrusion device according to claim 2, characterized in that: The side wall of the arc-shaped rod (431) is provided with a limiting groove, the inner wall of the slideway (421) is provided with a limiting strip adapted to the limiting groove, a plurality of rollers (422) are installed in the limiting strip, and the rollers (422) are tightly pressed against the inner wall of the limiting groove.

4. A battery cell extrusion device according to claim 2, characterized in that: The mold core (42) is provided with an installation cavity with a cross-shaped cross section, and a movable frame (423) is installed in the installation cavity and can slide along the axial direction of the mold core (42). Racks (4231) are arranged on four outer side surfaces of the movable frame (423), and teeth (433) are arranged on the convex surface of the arc rod (431). Four gears (424) are rotatably arranged in the mold core (42), and the gears (424) correspond to the racks (4231) and the arc rod (431) one by one and mesh with each other.

5. The battery cell extrusion device according to claim 1, characterized in that: The buffer positioning structure comprises a positioning rod (425) fixedly arranged on the outer wall of the mold core (42); a positioning cavity is provided in the extrusion sleeve (41); the positioning rod (425) extends into the positioning cavity and is slidably connected to the positioning cavity; buffer springs (426) are provided at both ends of the positioning rod (425).

6. A battery cell extrusion device according to claim 1, characterized in that: The flip positioning mechanism comprises a control plate (21) fixedly arranged on the machine head (2); a control gear (411) is sleeved on the rotating shaft of the extrusion sleeve (41); a one-way bearing is arranged between the control gear (411) and the rotating shaft of the extrusion sleeve (41); a control rack (211) is fixedly arranged on the inner side wall of the control plate (21); the control gear (411) and the control rack (211) are intermittently meshed; a positioning notch (212) is vertically opened on the control plate (21); a positioning piece (412) is fixedly arranged on the side wall of the rotating shaft of the extrusion sleeve (41); the positioning piece (412) and the positioning notch (212) have the same width; a reversing notch (213) is arranged at the bottom of the positioning notch (212); the control rack (211) and the reversing notch (213) are overlapped in position.

7. A battery cell extrusion device according to claim 6, characterized in that: A rounded corner is provided at the junction between the positioning notch (212) and the reversing notch (213).

8. The battery cell extrusion device according to claim 1, characterized in that: The centering mechanism (44) comprises a plurality of mounting grooves evenly arranged on the end surface of the extrusion sleeve (41), a slider (441) being slidably arranged in the mounting groove, a compression spring (442) being arranged between the slider (441) and the mounting groove, a push plate (443) extending out of the mounting groove being fixedly arranged on the top of the slider (441), a mounting frame being sleeved on the extrusion head (3), a plurality of insertion rods (6) corresponding to the push plates (443) being fixedly arranged on the side wall of the mounting frame, a plug hole (444) being arranged on the push plate (443), and when the compression spring (442) is in the initial state, the insertion rod (6) corresponds to the plug hole (444).

9. A battery cell extrusion device according to claim 8, characterized in that: A side surface of the insertion hole (444) close to the compression spring (442) is a wedge-shaped surface, and a bottom surface of the insertion rod (6) is an inclined surface corresponding to the wedge-shaped surface.

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