A continuous punching device and punching method for a new energy automobile battery separator

Abstract

The application discloses a continuous punching device and punching method for new energy automobile battery separators, and aims to solve the problems of difficult manual positioning, easy misplacement of the battery separators and deformation of the battery separators due to the material characteristics during the punching process. The punching device comprises a rack and a moving mechanism, the rack is sequentially provided with equidistantly arranged preheating tables, punching tables and shaping tables, the battery separators are preheated through the preheating tables and punched at constant temperature, and finally, the battery separators are cooled and shaped into qualified products. The precise grabbing and moving of the moving mechanism realize the precise positioning and moving of the battery separators from the preheating tables to the punching tables or from the punching tables to the shaping tables. The application solves the size change problem caused by the internal stress shrinkage and hole expansion after punching by using the temperature compensation control method, and the expansion of the punching hole caused by the cooling shrinkage and stress shrinkage of the battery separators is offset, so that the size accuracy of the punched battery separators is ensured.

Description

Technical Field

[0001] This invention relates to the field of punching processing technology for battery separators of new energy vehicles, and particularly to a continuous punching device and punching method for battery separators of new energy vehicles. Background Technology

[0002] To improve the driving range of electric vehicles, the number of battery modules installed is increased to improve the energy storage capacity of the batteries. However, as the number of battery modules increases, the battery separators applied to the battery modules also need to be larger, which means that the size of the battery separators applied to the battery modules needs to be increased.

[0003] Existing battery separators are mainly formed by vacuum forming. After vacuum forming, corresponding punch holes for the battery module are then cut into the plate to better position the battery and achieve the purpose of battery isolation on the battery module. During the punching process, the vacuum-formed battery separator needs to be manually positioned and placed on the punching mold. However, as the size of the battery separator increases, the positioning process becomes inconvenient and time-consuming. This is not only inefficient, but also prone to positioning misalignment during manual placement.

[0004] Furthermore, the battery separator deforms after punching and pressing, especially due to the plastic flow of the material, resulting in uneven punched edges and burrs. Simultaneously, the thinness of the battery separator and the influence of internal stress at the punched edges cause shrinkage deformation at the punched holes, leading to wrinkles on the separator surface. Moreover, the micro-deformation of multiple punched holes due to internal stress is amplified in large-sized battery separators, resulting in a significant change in the overall size of the battery separator. Factors such as inaccurate positioning, internal stress shrinkage after punching, and temperature variations in the punching environment cause the hole shape to shrink towards the hole edge. The punching process results in larger holes, and the punching process under different room temperature conditions causes expansion or contraction. These multiple factors contribute to the inconsistent size of the punched holes in the battery separator, leading to significant differences in quality between batches. For example, a battery separator with dimensions of 2.0m x 1.5m and a thickness of 1mm may have a 3-5mm dimensional error in its overall size due to the cumulative effect of multiple punched holes. This dimensional error makes it difficult to install the battery separator properly on the battery modules of new energy vehicles. Therefore, the existing punching equipment and methods for battery separators make it difficult to guarantee the dimensional quality of the product. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous punching device and punching method for battery separators of new energy vehicles, which aims to solve the problems of difficulty in manual positioning of battery separators during the punching process, easy misalignment of battery separators, and deformation caused by material characteristics during the punching process.

[0006] To achieve the above objectives, the present invention provides a continuous punching device for battery separators of new energy vehicles, comprising a frame and a moving mechanism, wherein a preheating table, a punching table and a shaping table are arranged at equal intervals on the frame.

[0007] The frame has an upper mounting platform and a support plate on the mounting platform. The mounting platform has a pair of sliding grooves for the moving mechanism to move. The support plate is equipped with a hydraulic cylinder.

[0008] The preheating platform includes a preheating upper mold connected to a hydraulic cylinder telescopic rod and a preheating lower mold disposed opposite to and fixed on the mounting surface. The preheating upper mold includes a preheating upper pressure plate, with an upper preheating boss at the bottom of the preheating upper pressure plate. A preheating upper shell is fitted over the upper preheating boss, and an upper preheating plate is installed between the preheating upper shell and the upper preheating boss. The preheating lower mold includes a preheating fixing seat, with a lower preheating boss installed on the preheating fixing seat. A preheating lower shell is fitted over the lower preheating boss, and a lower preheating plate is installed between the preheating lower shell and the lower preheating boss. The preheating upper mold presses the battery separator onto the preheating lower mold for preheating by means of a hydraulic cylinder.

[0009] The punching table includes an upper punching die connected to a hydraulic cylinder telescopic rod and a lower punching die opposite to and fixed on the mounting surface. The upper punching die includes an upper stamping plate, and a punching die is installed at the bottom of the upper stamping plate. The punching die has multiple punching heads, and a die baffle is arranged around the outer side of the multiple punching heads. The lower punching die includes a die holder corresponding to the punching die. The die holder has multiple punching pads corresponding to the punching heads, and a lower die baffle is arranged around the outer side of the multiple punching pads. The punching pads have punching openings corresponding to the punching heads. A heating element and a lower pad are installed on the surface of the punching pads. The upper punching die positions and punches the battery separator at a constant temperature by means of a hydraulic cylinder.

[0010] The shaping platform includes an upper shaping mold connected to a hydraulic cylinder telescopic rod and a lower shaping mold that is oppositely arranged and fixed on the mounting surface. The upper shaping mold includes an upper shaping pressure plate with an upper shaping boss at the bottom and an upper shaping shell fitted over the upper shaping boss. The lower shaping mold includes a shaping fixing seat with a lower shaping boss mounted on it and a lower shaping shell fitted over the lower shaping boss. The upper shaping mold presses the battery separator onto the lower shaping mold for cooling and shaping by means of a hydraulic cylinder.

[0011] The moving mechanism includes a moving bracket, on which a linear moving module is mounted. The linear moving module includes a support and a sliding seat. A pair of slide rails are mounted on the support, and a slider corresponding to each slide rail is located at the bottom of the sliding seat. The sliding seat slides on both sides of the support through the sliding engagement between the slider and the slide rail. A power device for linear movement is mounted on the sliding seat. An aluminum rod is mounted on the upper part of the sliding seat, and lifting cylinders are fixed to both ends of the aluminum rod. A pair of positioning grippers are mounted on the telescopic rod ends of the lifting cylinders. Each positioning gripper includes a support plate and gripping plates connected to both sides of the support plate. The plate extends through the groove and onto the upper part of the mounting platform. The end of the gripper plate has multiple pairs of gripping fingers connected by ribs. The front end of the ribs has a pair of protruding support columns, which correspond to the two sides of the positioned battery separator. By means of a lifting cylinder, the positioning gripper grabs and lifts the battery separator through the support columns. By means of the power device, one of the positioning grippers moves the battery separator on the preheating platform to the punching platform, while the other positioning gripper simultaneously moves the battery separator on the punching platform to the shaping platform.

[0012] Furthermore, the preheating table, the punching table, and the shaping table are provided with guide structures for upper and lower mold closing. The guide structure includes a mold closing guide post and a corresponding guide sleeve. The mold closing guide post includes a sliding post, and a ball bearing guide sleeve is fitted to the end of the sliding post. A first spring is also provided around the outside of the sliding post, and the first spring abuts against the end of the ball bearing guide sleeve. Through the sliding positioning and cooperation of the balls outside the ball bearing guide sleeve inside the guide sleeve, the positioning of the upper and lower mold closing of the preheating table, the punching table, and the shaping table is realized. Moreover, the first spring can effectively achieve a buffering effect during the upper and lower mold closing process, improving the stability of mold closing.

[0013] Furthermore, the preheating table, the punching table, and the shaping table are equipped with telescopic positioning posts for placing and positioning the battery separators. Each telescopic positioning post includes a telescopic post, a retaining sleeve, and a second spring. One end of the telescopic post has a guiding conical tip, on which a second sliding ball is provided that can roll relative to the conical tip. The retaining sleeve is fitted over the telescopic post, and the other end of the telescopic post has a locking end. The retaining sleeve is locked in place by the locking end, and the locking end also has a second spring that abuts against it. The telescopic post is fixed to the preheating table, punching table, and shaping table by the retaining sleeve, and the second spring is housed within the internal grooves of the preheating table, punching table, and shaping table by the retaining sleeve. The locking end of the telescopic post is elastically connected by the second spring. The battery separators are positioned by engaging with the telescopic positioning posts, thus ensuring the proper placement and positioning of the battery separators on the preheating table, punching table, and shaping table.

[0014] Furthermore, the rib plate is provided with a gripping plate positioning post for lifting and positioning the battery separator. The end of the gripping plate positioning post is provided with a guide cone end, and the cone end is provided with a first sliding ball that can roll relative to the cone end.

[0015] Furthermore, the preheating lower shell has lower heat conduction holes on its surface, so that the heat generated by the lower preheating plate can better preheat the lower surface of the battery separator that is pressed against the surface of the lower shell through the lower heat conduction holes.

[0016] Furthermore, the preheating upper shell has upper heat conduction holes on its surface, so that the heat generated by the upper preheating plate can better preheat the upper surface of the battery separator through the upper heat conduction holes.

[0017] Furthermore, the upper stamping plate is provided with a plurality of upper die top posts, and the punching fixing seat is provided with a lower die top post corresponding to the upper die top posts. Through the lower die top posts, the upper die top posts are supported and limited after the upper punching die is punched and closed.

[0018] Furthermore, the punching fixture also has a plurality of paired mold closing positioning posts, and the upper stamping plate is provided with a plurality of mold closing positioning holes corresponding to the mold closing positioning posts. Through the positioning cooperation between the mold closing positioning posts and the mold closing positioning holes, the upper punching die positions and punches the battery separator on the lower punching die.

[0019] Furthermore, a buffer pad is bonded to the end of the mold closing positioning post, and the buffer pad is made of rubber or silicone.

[0020] Furthermore, each of the punching heads has a central air hole that penetrates the punching head and connects to the upper surface of the upper stamping plate. Thus, after the battery separator is punched, the gas is blown out through the air hole, which can quickly remove the waste generated during punching.

[0021] Furthermore, the lower pad is provided with a clearance hole corresponding to the punching head. Through the clearance hole, the waste generated during punching is swept out.

[0022] Furthermore, the power unit includes a synchronous pulley, a synchronous belt, and a servo motor. The synchronous pulleys are rotatably mounted at both ends of the support plate. The synchronous belt is externally fitted between the two synchronous pulleys, enabling the two synchronous pulleys to rotate synchronously. One of the synchronous pulleys is also coaxially connected to the servo motor. A clamping block is provided between the sliding seat and one strand of the synchronous belt for clamping connection. Through the servo motor, the synchronous pulley drives the synchronous belt to move, and the sliding seat moves linearly back and forth on the slide rail along with one strand of the synchronous belt.

[0023] Furthermore, the support plate is equipped with an upward-facing sensor, and the outer side of the sliding seat is equipped with a sensing plate. Utilizing the sensor's sensing of the sensing plate, the sensor controls the servo motor to stop rotating via a controller. Thus, the sliding seat is positioned on a preset slide rail position, thereby enabling the two positioning grippers to switch between the preheating table, the punching table, and the shaping table.

[0024] Furthermore, the upper preheating plate, the lower preheating plate, and the heating plate are stainless steel sheets made of SUS304.

[0025] Furthermore, the surfaces of the upper preheating plate, the lower preheating plate, and the heating plate are coated with a layer of graphene heating paste with a thickness of 0.1 mm to 0.5 mm. The graphene heating paste includes 40 wt% graphene, 56 wt% polyethyl silicone resin, 3.1 wt% graphite powder as a conductive agent, 0.4 wt% leveling agent BYK-333, and 1.5 wt% organosilicon dispersant NXH-308.

[0026] The polyethyl silicone resin is preferably selected with an electrical breakdown strength > 40 kV / mm and a volume resistivity < 10. -14 Ω·cm.

[0027] This invention also provides a punching method for a battery separator in a new energy vehicle, comprising the following steps:

[0028] (1) Blank adjustment: Place the vacuum-formed battery separator blank at a temperature of 21℃~25℃ and a humidity of 45%~55% for 24h~48h to eliminate the internal stress of the battery separator;

[0029] (2) Preheating of billet: Position the battery separator after internal stress relief on the preheating platform, set the set temperature of the upper and lower preheating plates of the preheating platform to T+Δt, start the preheating upper mold, press the battery separator tightly with the preheating upper mold, and preheat for 15s~60s, where T is the room temperature outside the punching device, and Δt is the temperature compensation caused by the internal stress of the battery separator due to shrinkage after punching;

[0030] (3) Blank punching: The preheated battery separator is quickly positioned and moved to the punching table through the moving mechanism. The constant temperature of the heating plate of the punching table is set to T+Δt. The upper punching die is started and punched into shape.

[0031] (4) Cooling and shaping: After the battery separator is punched and formed, it is quickly positioned and moved to the shaping table by the moving mechanism. The upper shaping mold is started to press the battery separator onto the lower shaping mold. It is kept in the pressing and shaping state for 30s~60s to allow it to cool naturally. The finished battery separator is then taken out.

[0032] In step (2) or step (3), the temperature compensation Δt is calculated according to the following formula:

[0033]

[0034] In the formula, Δt is the compensation temperature, in °C;

[0035] -- is the linear expansion coefficient of the material, in m / m·℃;

[0036] -- is the linear deformation coefficient for punching stress, in m / m.

[0037] In step (2) or step (3), the temperature is set to satisfy T+Δt≤40℃.

[0038] The continuous punching device for battery separators of the new energy vehicle of the present invention can complete the feeding of battery separators on the preheating table and the unloading of battery separators on the shaping table by external automated robots or other means.

[0039] This invention improves the precise positioning and placement of the battery separator by setting telescopic positioning columns on the preheating table, punching table, and shaping table to position and cooperate with the second positioning part of the battery separator.

[0040] This invention uses a preheating station with a set temperature to preheat the battery separator, allowing it to expand to a certain extent from room temperature. During the punching process, the battery separator is punched under this expanded condition. After punching, the punching hole expands due to the shrinkage caused by the punching stress. During the shaping process, the cooling shrinkage of the battery separator and the stress shrinkage counteract the expansion of the punching hole, thus ensuring the accuracy of the dimensions of the finished battery separator.

[0041] This invention utilizes the positioning gripper of the moving mechanism to precisely and synchronously move the battery separators on the preheating table and the punching table to the next operating table, greatly improving the production continuity of battery separators.

[0042] This invention effectively solves the problems of difficulty in manual positioning during the punching process of battery separators, which can easily lead to misalignment of the battery separators and deformation due to the characteristics of the materials during punching. It greatly improves the production quality of battery separators, especially large-size battery separators. Attached Figure Description

[0043] Figure 1 This is a three-dimensional structural diagram of a continuous punching device.

[0044] Figure 2 This is a schematic diagram of the three-dimensional structure of the preheating platform.

[0045] Figure 3 This is a schematic diagram of the preheating lower mold assembly structure.

[0046] Figure 4 This is a schematic diagram of the preheating upper mold assembly structure.

[0047] Figure 5 This is a schematic diagram of the three-dimensional structure of the punching table.

[0048] Figure 6 This is a schematic diagram of the assembly structure of the lower punch die.

[0049] Figure 7 This is a schematic diagram of the upper punch die assembly structure.

[0050] Figure 8 This is a schematic diagram of the three-dimensional structure of the shaping platform.

[0051] Figure 9 This is a schematic diagram of the three-dimensional structure of the lower mold for shaping.

[0052] Figure 10 A schematic diagram of the three-dimensional structure of the upper mold for shaping.

[0053] Figure 11 This is one of the schematic diagrams of the three-dimensional structure of the moving mechanism.

[0054] Figure 12 This is the second schematic diagram of the three-dimensional structure of the moving mechanism.

[0055] Figure 13 for Figure 11 A magnified view of part A in the diagram.

[0056] Figure 14 This is a schematic diagram of the back structure of the battery separator before punching.

[0057] Figure 15 This is a schematic diagram of the back structure of the battery separator after punching.

[0058] Figure 16 This is a schematic diagram of the three-dimensional structure of the telescopic positioning column.

[0059] Figure 17 for Figure 16 Internal cross-section diagram.

[0060] Wherein: 10-Frame, 11-Mounting platform, 111-Slide groove, 12-Support plate, 13-Support rod, 14-Hydraulic cylinder, 20-Preheating platform, 21-Preheating upper die, 211-Preheating lifting plate, 212-Preheating upper pressure plate, 213-Upper preheating boss, 214-Upper preheating plate, 215-Preheating upper shell, 2151-Upper heat guiding hole, 22-Preheating lower die, 221-Preheating fixing seat, 222-Preheating lower shell, 2221-Lower heat guiding hole, 2222-Anti-deviation hole, 223-Lower preheating plate, 224-Lower preheating boss, 30-Punching platform, 31-Upper punching die, 311 - Punching lifting plate, 312-Upper punching plate, 3121-Mold closing positioning hole, 313-Punching die, 3131-Punching head, 3132-Die plate baffle, 3133-Air hole, 314-Upper die top post, 32-Lower punching die, 321-Punching fixing seat, 322-Die plate holder, 3221-Lower die baffle, 3222-Punching pad, 3223-Punching opening, 323-Mold closing positioning post, 324-Lower die top post, 325-Lower pad, 3251-Leaning hole, 326-Heating plate, 327-Buffer pad, 40-Shaping platform, 41-Shaping upper die, 411-Shaping lifting plate Plate, 412-Shaping upper pressure plate, 413-Upper shaping boss, 414-Shaping upper shell, 42-Shaping lower mold, 421-Shaping fixed seat, 422-Shaping lower shell, 423-Lower shaping boss, 50-Moving mechanism, 51-Moving bracket, 52-Support plate, 521-Slide rail, 522-Limit plate, 523-Sensor, 53-Aluminum rod, 54-Lifting cylinder, 55-Sliding seat, 551-Slider, 552-Limit post, 553-Sensing plate, 56-Servo motor, 57-Synchronous pulley, 58-Synchronous belt, 59-Positioning gripper, 591-Support plate, 592-Grip plate, 5921-Grab finger, 5922-Rib plate, 5923-Support column, 593-Grab plate positioning column, 594-First sliding ball, 60-Battery separator, 61-Punching hole, 62-First positioning part, 621-Grab plate positioning hole, 622-Arched bottom, 63-Second positioning part, 631-Separator positioning hole, 64-Anti-deviation protrusion, 70-Guide structure, 71-Mold closing guide column, 711-Sliding column, 712-First spring, 713-Ball guide sleeve, 72-Guide sleeve, 80-Telescopic positioning column, 81-Telescopic column, 82-Second sliding ball, 83-Clip sleeve, 84-Second spring. Detailed Implementation

[0061] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] To better understand the specific embodiments of the present invention, the specific structure of the battery separator 60 is described in reference to... Figure 14 , 15 As shown, where, Figure 14 This is a schematic diagram of the back structure of the battery separator 60 before punching. The battery separator 60 has multiple pairs of first positioning portions 62 on both sides along its length. The back surface of each first positioning portion 62 has an arc-shaped bottom 622. A gripping plate positioning hole 621 is opened at the center of the arc-shaped bottom 622 of the first positioning portion 62. The gripping plate positioning hole 621 is used to grip and engage with the gripping plate positioning post 593 on the gripping plate 592 to ensure that the battery separator 60 does not shake during the movement of the moving mechanism 50, thus preventing positional shift. The battery separator 60 also has a pair of... The second positioning part 63 has a partition positioning hole 631 at its center. The partition positioning hole 631 is used to cooperate with the telescopic positioning post 80 on the preheating table 20, the punching table 30 or the shaping table 40, so that the battery separator 60 can be better positioned on the preheating table 20, the punching table 30 or the shaping table 40. The surface of the battery separator 60 is provided with multiple anti-deviation protrusions 64. The anti-deviation protrusions 64 further cooperate with the preheating table 20, the punching table 30 or the shaping table 40 to form a multi-point positioning cooperation. The surface of the punched battery separator 60 includes a punched product with multiple punching holes 61.

[0063] In this invention, after the battery separator 60 is punched, a cutting assembly for cutting off the first positioning part 62 and the second positioning part 63 of the battery separator 60 can be provided on the shaping table 40 to ensure the normal use of the battery separator 60. Example 1

[0064] A continuous punching device for battery separators in new energy vehicles, referring to Figure 1 It includes a frame 10 and a moving mechanism 50. A preheating table 20, a punching table 30 and a shaping table 40 are arranged at equal intervals on the frame 10.

[0065] The frame 10 has an upper mounting platform 11 and a support plate 12 on the mounting platform 11. The support plate 12 is supported by a support rod 13. The space formed between the support plate 12 and the mounting platform 11 is used to install the preheating table 20, the punching table 30 and the shaping table 40. A pair of sliding grooves 111 are provided on the mounting platform 11 for the moving mechanism 50 to move between the preheating table 20, the punching table 30 and the shaping table 40. A hydraulic cylinder 14 is provided on the support plate 12 for hydraulic drive.

[0066] Reference Figure 2 , Figure 3 , Figure 4The preheating platform 20 includes a preheating upper mold 21 connected to the telescopic rod of the hydraulic cylinder 14 and a preheating lower mold 22 oppositely arranged and fixed on the mounting surface 11. The preheating upper mold 21 includes a preheating lifting plate 211 connected to the end of the telescopic rod of the hydraulic cylinder 14. A preheating upper pressure plate 212 is provided at the bottom of the preheating lifting plate 211. An upper preheating boss 213 is provided at the bottom of the preheating upper pressure plate 212. A preheating upper shell 215 is fitted outside the upper preheating boss 213. The preheating upper shell 215... An upper preheating plate 214 is installed between the upper preheating boss 213 and the preheating lower mold 22, including a preheating fixing seat 221, a lower preheating boss 224 is installed on the preheating fixing seat 221, a preheating lower shell 222 is fitted on the lower preheating boss 224, and a lower preheating plate 223 is installed between the preheating lower shell 222 and the lower preheating boss 224. Through the hydraulic cylinder 14, the preheating upper mold 21 presses the battery separator 60 onto the preheating lower mold 22 to achieve preheating of the battery separator 60 in the pressed state.

[0067] To better achieve the preheating effect of the battery separator 60 on the preheating platform 20, the surfaces of the preheating upper shell 215 and the preheating lower shell 222 are provided with surfaces that match the concave and convex surfaces of the battery separator 60's vacuum forming surface, so that the battery separator 60 can be better fitted and positioned on the preheating platform 20. The surface of the preheating lower shell 222 is provided with a lower heat conduction hole 2221 and an anti-deviation hole 2222. The anti-deviation hole 2222 and the anti-deviation protrusion 64 on the battery separator 60 cooperate with each other, so that there is no gap between the battery separator 60 and the preheating lower shell 222. The surface of the preheating upper shell 215 is provided with an upper heat conduction hole 2151, so that heat can be better preheated on both the upper and lower surfaces of the battery separator 60 at the same time.

[0068] Reference Figure 5 , Figure 6 , Figure 7The punching table 30 includes an upper punching die 31 connected to the telescopic rod of the hydraulic cylinder 14 and a lower punching die 32 oppositely arranged and fixed on the mounting surface 11. The upper punching die 31 includes a punching lifting plate 311 connected to the telescopic rod end of the hydraulic cylinder 14. An upper stamping plate 312 is provided at the bottom of the punching lifting plate 311, and a punching die 313 is installed at the bottom of the upper stamping plate 312. The punching die 313 is provided with multiple punching heads 3131, and die baffles 3132 are provided around the outer sides of the multiple punching heads 3131. The die baffles 3132 form a structure that matches the shape of the battery separator 60. The lower punching die 32 includes a die holder 322 corresponding to the punching die 313. The die holder 322 is provided with multiple punching pads 3222 corresponding to the punching heads 3131. The outer side is surrounded by a lower mold baffle 3221, which matches the die-cutting baffle 3132. The upper stamping plate 312 is provided with multiple upper mold top posts 314, and the punching fixing seat 321 is provided with lower mold top posts 324 corresponding to the upper mold top posts 314. Through the lower mold top posts 324, the upper mold top posts 314 are supported and limited after the upper punching die 31 punches and closes. The punching fixing seat 321 is also provided with multiple pairs of mold closing positioning posts 323. The upper stamping plate 312 is provided with multiple mold closing positioning holes 3121 corresponding to the mold closing positioning posts 323. Through the positioning cooperation between the mold closing positioning posts 323 and the mold closing positioning holes 3121, the upper punching die 31 positions and punches the battery separator 60 on the lower punching die 32. In order to achieve a better buffering effect, a buffer pad 327 is bonded to the end of the mold closing positioning post 323. The buffer pad 327 is made of rubber or silicone.

[0069] The punching pad 3222 has a punching notch 3223 corresponding to the punching head 3131. The edge of the punching notch 3223 and the edge of the punching head 3131 form a punching fit. To better achieve the punching fit of the punching notch 3223 of the punching head 3131, the gap between the edges of the punching notch 3223 and the edges of the punching head 3131 is less than 8μm. A heating element 326 and a lower pad 325 are mounted on the surface of the punching pad 3222. The plate 325 has a clearance hole 3251 corresponding to the punching opening 3223, and the heating plate 326 also has a hole corresponding to the punching opening 3223. The surface of the lower pad 325 is provided with a surface that matches the concave and convex surface of the battery separator 60, so that the battery separator 60 can be better fitted and positioned on the lower pad 325. Through the hydraulic cylinder 14, the upper punching die 31 punches and positions the battery separator 60 positioned on the die holder 322 under constant temperature.

[0070] After the battery separator 60 is punched, waste material is generated. Correspondingly, in this invention, an air hole 3133 is provided in the center of each punching head 3131. The air hole 3133 penetrates the punching head 3131 and is connected to the upper surface of the upper stamping plate 312. Furthermore, the air hole 3133 is connected to an external air blowing pipe. After the battery separator 60 is punched, the waste material generated by punching can be quickly blown away by blowing gas through the air hole 3133. Furthermore, the lower pad 325 is provided with a clearance hole 3251 corresponding to the punching head 3131. Using the clearance hole 3251, the waste material blown away from the air hole 3133 is swept out through the clearance hole 3251 and the punching opening 3223 of the punching pad 3222 for collection, so as not to generate the problem of punching waste accumulation.

[0071] Reference Figure 8 , Figure 9 , Figure 10 The shaping platform 40 includes a shaping upper mold 41 connected to the telescopic rod of the hydraulic cylinder 14 and a shaping lower mold 42 oppositely arranged and fixed on the mounting surface 11. The shaping upper mold 41 includes a shaping lifting plate 411 connected to the telescopic rod end of the hydraulic cylinder 14. A shaping upper pressure plate 412 is provided at the bottom of the shaping lifting plate 411. An upper shaping boss 413 is provided at the bottom of the upper shaping boss 412. A shaping upper shell 414 is fitted outside the upper shaping boss 413. The shaping lower mold 42 includes a shaping fixing seat. 421, A lower shaping boss 423 is installed on the shaping fixing base 421, and a lower shaping shell 422 is fitted on the lower shaping boss 423. Through the hydraulic cylinder 14, the upper shaping mold 41 presses the battery separator 60 onto the lower shaping mold 42 for cooling and shaping. The surfaces of the upper shaping shell 414 and the lower shaping shell 422 are provided with surfaces that match the concave and convex surfaces of the vacuum forming surface of the battery separator 60, so that the battery separator 60 can be better fitted and positioned on the shaping table 40, thereby better achieving the shaping of the battery separator 60 after cooling.

[0072] To ensure precise positioning of the battery separator 60 on the preheating table 20, the punching table 30, and the shaping table 40, telescopic positioning columns 80 are provided on the preheating table 20, the punching table 30, and the shaping table 40, as shown in the reference. Figure 16 , Figure 17The telescopic positioning post 80 includes a telescopic post 81, a retaining sleeve 83, and a second spring 84. One end of the telescopic post 81 is provided with a guide cone-shaped tip, and a second sliding ball 82 that can roll relative to the cone-shaped tip is provided on the cone-shaped tip. The retaining sleeve 83 is sleeved on the outside of the telescopic post 81, and the other end of the telescopic post 81 is provided with a locking end. The retaining sleeve 83 is locked in place through the locking end, and the second spring 84 is also provided inside the locking end for abutment. In specific installation, the telescopic post 81 is fixed in place by the retaining sleeve 83. The second spring 84 is embedded in the internal grooves of the preheating table 20, the punching table 30, and the shaping table 40 through the sleeve 83. The locking end 812 of the telescopic column 81 is supported by the second spring 84 to form an elastic connection. The second positioning part 63 of the battery separator 60 is locked in place by the telescopic positioning column 80 to ensure the precise positioning of the battery separator 60 on the preheating table 20, the punching table 30, and the shaping table 40.

[0073] To further improve the positioning of the upper and lower molds of the preheating table 20, the punching table 30, and the shaping table 40, a guide structure 70 for upper and lower mold closing is provided on the preheating table 20, the punching table 30, and the shaping table 40. The guide structure 70 includes a mold closing guide post 71 and a corresponding guide sleeve 72. The mold closing guide post 71 includes a sliding post 711, and a ball bearing guide sleeve 713 is fitted at the end of the sliding post 711. A first spring 712 is also provided around the outside of the sliding post 711, and the first spring 712 abuts against the end of the ball bearing guide sleeve 713. Through the sliding positioning and cooperation of the balls outside the ball bearing guide sleeve 713 inside the guide sleeve 72, the positioning of the upper and lower molds of the preheating table 20, the punching table 30, and the shaping table 40 is realized. Through the first spring 712, the buffering effect during the upper and lower mold closing process can be well realized, and the stability of the mold closing performance can be improved.

[0074] Reference Figure 11 , Figure 12 The moving mechanism 50 includes a moving bracket 51, on which a linear moving module is mounted. The linear moving module includes a bracket 52 and a sliding seat 55. The bracket 52 has a pair of slide rails 521, and the bottom of the sliding seat 55 has a corresponding slider 551. The slider 551 and the slide rails 521 are slidably engaged. The sliding seat 55 slides on both sides of the bracket 52. The sliding seat 55 is equipped with a power device for its linear movement. (Refer to...) Figure 13The power unit includes a synchronous pulley 57, a synchronous belt 58, and a servo motor 56. The synchronous pulley 57 is rotatably mounted on both ends of the support plate 52. The synchronous belt 58 is externally fitted between the two synchronous pulleys 57, so that the two synchronous pulleys 57 form a synchronous rotation connection. One of the synchronous pulleys 57 is also coaxially connected to the servo motor 56. A clamping block is provided between the sliding seat 55 and one of the strands of the synchronous belt 58 for clamping connection. Through the servo motor 56, the synchronous pulley 57 drives the synchronous belt 58 to move. The sliding seat 55 moves linearly back and forth on the slide rail 521 along with one of the strands of the synchronous belt 58. An aluminum rod 53 is provided on the upper part of the sliding seat 55. The aluminum rod 53 extends to both sides in the direction of movement on the sliding seat 55. Lifting cylinders 54 are fixed at both ends of the aluminum rod 53. A pair of positioning grippers 59 are provided at the telescopic rod end of the lifting cylinder 54.

[0075] The positioning gripper 59 includes a support plate 591, which is U-shaped. Grippers 592 are mounted at both ends of the U-shape of the support plate 591. The two ends of the U-shape of the support plate 591 correspond to the sliding groove 111, and the grippers 592 extend through the sliding groove 111 and onto the upper part of the mounting platform 11. At the end of the gripper 592, there are multiple pairs of gripping fingers 5921. In this invention, two pairs of gripping fingers 5921 are provided on the gripper 592, and the pairs of gripping fingers 5921 are connected by ribs 5922. A pair of supporting posts 5923 protruding from the front end of the ribs 5922 are provided, and the supporting posts 5923 correspond to the two sides of the positioned battery separator 60. The positioning gripper 59 is moved by a lifting cylinder 54. The support column 5923 grasps and lifts the battery separator 60. Two positioning grippers 59 are provided, corresponding to the battery separator 60 on the preheating table 20 and the battery separator 60 on the punching table 30, respectively. Through the power device, the sliding seat 55 moves, thereby switching the positioning gripper 59 corresponding to the preheating table 20 to the punching table 30, thus realizing the positioning of the battery separator 60 on the preheating table 20 to the punching table 30. The positioning gripper 59 corresponding to the punching table 30 switches to the shaping table 40, thus realizing the positioning of the battery separator 60 on the punching table 30 to the shaping table 40. After the switching is completed, the moving mechanism 50 can move in the opposite direction to switch the corresponding positions of the two positioning grippers 59.

[0076] During the lifting and moving process of the moving mechanism 50, in order to prevent the battery separator 60 from shifting position due to shaking during the rapid movement of the moving mechanism 50, this invention further provides a gripping plate positioning post 593 on the rib plate 5922 for lifting and positioning the battery separator 60. The end of the gripping plate positioning post 593 is provided with a guide conical end, and a first sliding ball 594 that can roll relative to the conical end is provided on the conical end. During the process of the positioning gripper 59's support post 5923 gripping and lifting the battery separator 60, the gripping plate positioning post 593 rolls correspondingly through the first sliding ball 594. At the same time, since the bottom of the first positioning part 62 of the battery separator 60 is provided with an arc-shaped bottom 622, and the arc-shaped bottom 622 is provided with a guide plate positioning post 593 for lifting and positioning the battery separator 60. A gripper positioning hole 621 is provided at the center of the bottom 622. The slight shaking during the lifting process will cause the first sliding bead 594 to roll along the arc-shaped bottom 622 into the gripper positioning hole 621 at the center of the arc-shaped bottom 622. Then, the first sliding bead 594 rolls to achieve the sliding adjustment of the gripper positioning post 593 and fits into the gripper positioning hole 621. The multiple gripper positioning posts 593 completely cover the overall positioning of the battery separator 60, thus achieving accurate positioning after the positioning gripper 59 grasps it. After positioning, it not only ensures that the battery separator 60 will not shake during the movement, but also ensures the positioning of the battery separator 60 after the moving mechanism 50 moves.

[0077] In this invention, to improve the movement accuracy of the moving mechanism 50, two sensors 523 with an upward sensing direction are provided on the support plate 52 of the moving mechanism 50. A sensing plate 553 is provided on the outer side of the sliding seat 55. The two sensors 523 respectively sense and control the two position states of the sliding seat 55. Using the sensing of the sensing plate 553 by the sensors 523, the sensors 523 control the servo motor 56 to stop rotating via the controller. Thus, the sliding seat 55 is positioned on the preset slide rail 521, thereby realizing the switching of positioning movement of the two positioning grippers 59 between the preheating table 20, the punching table 30, and the shaping table 40. Simultaneously, to prevent the sliding seat 55 from shifting during sliding, limit plates 522 are provided at both ends of the slide rail 521, and limit posts 552 corresponding to the limit plates 522 are provided on the sliding seat 55. During the sliding process of the sliding seat 55 on the slide rail 521, the limit plates 522 limit the sliding seat 55 on both sides of the slide rail 521.

[0078] In this invention, to better improve the uniformity and accuracy of temperature control of the preheating table 20 and the punching table 30, the upper preheating plate 214, the lower preheating plate 223 and the heating plate 326 are stainless steel sheets made of SUS304. The surfaces of the upper preheating plate 214, the lower preheating plate 223 and the heating plate 326 are coated with a layer of graphene heating paste with a thickness of 0.1mm to 0.5mm. The graphene heating paste includes graphene: 40wt%, polyethyl silicone resin: 56wt%, conductive agent (graphite powder): 3.1wt%, leveling agent (BYK-333): 0.4wt%, and organosilicon dispersant (NXH-308): 1.5wt%.

[0079] The polyethyl silicone resin is preferably selected with an electrical breakdown strength > 40 kV / mm and a volume resistivity < 10. -14 Ω·cm.

[0080] Graphene heating paste is coated onto the surface of a metal sheet to form a graphene heating element. The graphene heating paste can be coated according to the surface shape of the metal sheet, which greatly improves the uniform heating performance of the graphene heating element and ensures the uniformity and accuracy of temperature control of the preheating table 20 and the punching table 30. Example 2

[0081] A punching method for a battery separator in a new energy vehicle, comprising the following steps:

[0082] (1) Blank adjustment: Place the vacuum-formed battery separator 60 blank at a temperature of 21℃~25℃ and a humidity of 45%~55% for 24h~48h to eliminate the internal stress of the battery separator 60;

[0083] (2) Preheating of billet: The battery separator 60 after internal stress relief is positioned on the preheating table 20. The set temperature of the upper preheating plate 214 and the lower preheating plate 223 of the preheating table 20 is set to T+Δt. The preheating upper mold 21 is started. The preheating upper mold 21 presses the battery separator 60 tightly and preheats for 15s~60s. Where T is the room temperature outside the punching device and Δt is the temperature compensation caused by the shrinkage of the internal stress of the battery separator 60 after punching.

[0084] (3) Blank punching: The preheated battery separator 60 is quickly positioned and moved to the punching table 30 by the moving mechanism 50. The constant temperature of the heating plate 326 of the punching table 30 is set to T+Δt. The upper punching die 31 is started to punch and form.

[0085] (4) Cooling and shaping: The battery separator 60 after punching is quickly positioned and moved to the shaping table 40 by the moving mechanism 50. The upper shaping mold 41 is started and the upper shaping mold 41 presses the battery separator 60 onto the lower shaping mold 42. It is kept in the pressing and shaping state for 30s~60s to allow it to cool naturally. The finished battery separator 60 is then taken out.

[0086] In step (2) or step (3), the temperature compensation Δt is calculated according to the following formula:

[0087]

[0088] In the formula, Δt is the compensation temperature, in °C;

[0089] -- is the linear expansion coefficient of the material, in m / m·℃;

[0090] -- is the linear deformation coefficient for punching stress, in m / m.

[0091] In step (2) or step (3), the temperature is set to satisfy T+Δt≤40℃.

[0092] Among them, the linear expansion coefficient of the material The following method was used to determine the dimensions of PET, ABS, and PS plastics. 1mm thick sheets were injection molded and cut into 100mm x 50mm samples. The edges of the samples were smoothed by grinding with sandpaper of a finer grit (greater than 1000 grit). The samples were placed on a constant-temperature heating table (with a temperature accuracy of 0.1℃), and a transparent glass plate was used to press the sample surface to prevent deformation and facilitate dimensional measurement. The samples were placed on the measuring platform of an IM-8000 image dimension measuring instrument at constant temperatures of 25℃, 26℃, 27℃, 28℃, 29℃, and 30℃, and the length dimensions of the samples at these temperatures were measured. The results are shown in Table 1.

[0093] Table 1:

[0094]

[0095] Plotting the measured length y as the ordinate and the temperature x as the abscissa, we fit the measurement results to a straight line and obtain:

[0096] PET is y = 0.0694x + 99.656 R 2 =0.9989;

[0097] ABS is y = 0.0681x + 99.35 R 2 =0.9979;

[0098] PS is y = 0.0782x + 99.43 R 2 =0.9902;

[0099] Dividing both ends of the fitted straight line by the intercepts yields the expansion straight line per unit length with 0℃ as the reference:

[0100] PET is y / 99.656 = 0.00696x + 1, that is: =0.000696;

[0101] ABS is y / 99.35 = 0.000685x + 1, that is: =0.000685;

[0102] PS is y / 99.43 = 0.000786x + 1, which means: =0.000786;

[0103] Among them, the linear deformation coefficient of the punching stress of the material The following method was used to determine the following: PET, ABS, and PS plastics were selected and injection molded into 1mm thick sheets. Samples measuring 150mm × 150mm were cut from these sheets and placed under constant temperature and humidity conditions (25℃, 50%) for 24 hours. Under the same temperature and humidity conditions, a punching machine was used to punch a hole at the center of the sample. The punching diameter was 50mm, and the gap between the edge of the punch cut and the edge of the punching head was less than 8μm. The initial punching diameter D0 was measured within 5 minutes after punching, and the punching diameter D1 was measured again after 24 hours of adjustment. The measurements were then performed using an IM-8000 image dimension measuring instrument under the same temperature and humidity conditions. The results are shown in Table 2. The linear deformation coefficient of the punching stress of the material is also discussed. pass =Calculated as (D1-D0) / D0.

[0104] Table 2:

[0105]

[0106] Based on Tables 1 and 2, the compensation temperature used in the punching method for commonly used materials of the battery separator of this invention is obtained, and the results are shown in Table 3.

[0107] Table 3:

[0108]

[0109] In steps (2) and (3), the temperature compensation adjustment of different materials adopts the preheating and constant temperature punching conditions according to Table 3. After punching, the product is shaped in the shaping table 40. Due to the cooling shrinkage and the expansion of the hole diameter caused by the internal stress of the punching hole, a balance is formed, thereby ensuring the accuracy control of the punching dimensions of the battery separator under different conditions and achieving the purpose of application.

[0110] Although only PET, ABS, PS and other materials are listed in the examples, other materials can also be tested and calculated using the same method as described above to obtain the actual value of the corresponding temperature compensation. Other materials can also be applied to the above-mentioned punching method to achieve accurate control of punching dimensions.

[0111] Of course, considering the characteristics of plastic materials such as PET, ABS, and PS, when the set temperature is T+Δt>40℃, the cutting effect will be worse because the plastic material softens. Therefore, setting the temperature to T+Δt≤40℃ is the better choice in this embodiment.

[0112] The continuous punching device and punching method for a new energy vehicle battery separator provided by the present invention have been described in detail above. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A continuous punching device for new energy automobile battery separators, characterized in that, include: A frame and a moving mechanism, wherein a preheating table, a punching table and a shaping table are arranged at equal intervals on the frame; The frame has an upper mounting platform and a support plate on the mounting platform. The mounting platform has a pair of sliding grooves for the moving mechanism to move. The support plate is equipped with a hydraulic cylinder. The preheating platform includes a preheating upper mold connected to a hydraulic cylinder telescopic rod and a preheating lower mold disposed opposite to and fixed on the mounting surface. The preheating upper mold includes a preheating upper pressure plate, with an upper preheating boss at the bottom of the preheating upper pressure plate. A preheating upper shell is fitted over the upper preheating boss, and an upper preheating plate is installed between the preheating upper shell and the upper preheating boss. The preheating lower mold includes a preheating fixing seat, with a lower preheating boss installed on the preheating fixing seat. A preheating lower shell is fitted over the lower preheating boss, and a lower preheating plate is installed between the preheating lower shell and the lower preheating boss. The preheating upper mold presses the battery separator onto the preheating lower mold for preheating by means of a hydraulic cylinder. The punching table includes an upper punching die connected to a hydraulic cylinder telescopic rod and a lower punching die opposite to and fixed on the mounting surface. The upper punching die includes an upper stamping plate, and a punching die is installed at the bottom of the upper stamping plate. The punching die has multiple punching heads, and a die baffle is arranged around the outer side of the multiple punching heads. The lower punching die includes a die holder corresponding to the punching die. The die holder has multiple punching pads corresponding to the punching heads, and a lower die baffle is arranged around the outer side of the multiple punching pads. The punching pads have punching openings corresponding to the punching heads. A heating element and a lower pad are installed on the surface of the punching pads. The upper punching die positions and punches the battery separator at a constant temperature by means of a hydraulic cylinder. The shaping platform includes an upper shaping mold connected to a hydraulic cylinder telescopic rod and a lower shaping mold that is oppositely arranged and fixed on the mounting surface. The upper shaping mold includes an upper shaping pressure plate with an upper shaping boss at the bottom and an upper shaping shell fitted over the upper shaping boss. The lower shaping mold includes a shaping fixing seat with a lower shaping boss mounted on it and a lower shaping shell fitted over the lower shaping boss. The upper shaping mold presses the battery separator onto the lower shaping mold for cooling and shaping by means of a hydraulic cylinder. The moving mechanism includes a moving bracket, on which a linear moving module is mounted. The linear moving module includes a support and a sliding seat. A pair of slide rails are mounted on the support, and a slider corresponding to each slide rail is located at the bottom of the sliding seat. The sliding seat slides on both sides of the support through the sliding engagement between the slider and the slide rail. A power device for linear movement is mounted on the sliding seat. An aluminum rod is mounted on the upper part of the sliding seat, and lifting cylinders are fixed to both ends of the aluminum rod. A pair of positioning grippers are mounted on the telescopic rod ends of the lifting cylinders. Each positioning gripper includes a support plate and gripping plates connected to both sides of the support plate. The plate extends through the groove and onto the upper part of the mounting platform. The end of the gripper plate has multiple pairs of gripping fingers connected by ribs. The front end of the ribs has a pair of protruding support columns, which correspond to the two sides of the positioned battery separator. By means of a lifting cylinder, the positioning gripper grabs and lifts the battery separator through the support columns. By means of the power device, one of the positioning grippers moves the battery separator on the preheating platform to the punching platform, while the other positioning gripper simultaneously moves the battery separator on the punching platform to the shaping platform.

2. The continuous punching device for new energy automobile battery separators according to claim 1, characterized in that: The preheating table, the punching table, and the shaping table are provided with guide structures for upper and lower mold closing. The guide structure includes a mold closing guide post and a corresponding guide sleeve. The mold closing guide post includes a sliding post. A ball bearing guide sleeve is fitted at the end of the sliding post. A first spring is also provided around the outside of the sliding post, and the first spring abuts against the end of the ball bearing guide sleeve.

3. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: The preheating table, the punching table, and the shaping table are equipped with telescopic positioning posts for placing and positioning battery separators. Each telescopic positioning post includes a telescopic post, a retaining sleeve, and a second spring. One end of the telescopic post is provided with a guide cone-shaped tip, and a second sliding ball that can roll relative to the cone-shaped tip is provided on the cone-shaped tip. The retaining sleeve is fitted over the outside of the telescopic post, and the other end of the telescopic post is provided with a locking end. The retaining sleeve is locked through the locking end, and a second spring that abuts against it is also provided inside the locking end.

4. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: The rib plate is provided with a gripping plate positioning post for lifting and positioning the battery separator. The end of the gripping plate positioning post is provided with a guide cone end, and a first sliding ball that can roll relative to the cone end is provided on the cone end.

5. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: The punching fixture also has multiple pairs of mold closing positioning posts. The upper stamping plate is provided with multiple mold closing positioning holes corresponding to the mold closing positioning posts. Through the positioning cooperation between the mold closing positioning posts and the mold closing positioning holes, the upper punching die positions and punches the battery separator on the lower punching die. The ends of the mold closing positioning posts are bonded with buffer pads, which are made of rubber or silicone.

6. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: Each of the punching heads has a central air hole that penetrates the punching head and connects to the upper surface of the upper stamping plate.

7. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: The power unit includes a synchronous pulley, a synchronous belt, and a servo motor. The synchronous pulleys are rotatably mounted at both ends of the support plate. The synchronous belt is externally fitted between the two synchronous pulleys, enabling the two synchronous pulleys to rotate synchronously. One of the synchronous pulleys is also coaxially connected to the servo motor. A clamping block is provided between the sliding seat and one strand of the synchronous belt for clamping connection. Through the servo motor, the synchronous pulley drives the synchronous belt to move, and the sliding seat moves linearly back and forth on the slide rail along with one strand of the synchronous belt.

8. The continuous punching device for the battery separator of a new energy vehicle according to claim 7, characterized in that: The support plate is equipped with an upward-facing sensor, and the outer side of the sliding seat is equipped with a sensing plate.

9. The continuous punching device for the battery separator of a new energy vehicle according to claim 1, characterized in that: The upper preheating plate, the lower preheating plate, and the heating plate are stainless steel sheets made of SUS304. The surfaces of the upper preheating plate, the lower preheating plate, and the heating plate are coated with a layer of graphene heating paste with a thickness of 0.1mm to 0.5mm.

10. A punching method for a battery separator for new energy vehicles according to any one of claims 1 to 9, characterized in that, Includes the following steps: (1) Blank adjustment: Place the vacuum-formed battery separator blank at a temperature of 21℃~25℃ and a humidity of 45%~55% for 24h~48h to eliminate the internal stress of the battery separator; (2) Preheating of billet: Position the battery separator after internal stress relief on the preheating platform, set the preheating temperature of the upper and lower preheating plates of the preheating platform to T+Δt, start the preheating upper mold, the preheating upper mold presses the battery separator tightly, and preheat for 15s~60s, where T is the room temperature outside the punching device, and Δt is the temperature compensation caused by the internal stress of the battery separator due to shrinkage after punching; (3) Blank punching: The preheated battery separator is quickly positioned and moved to the punching table through the moving mechanism. The constant temperature of the heating plate of the punching table is set to T+Δt. The upper punching die is started and punched into shape. (4) Cooling and shaping: After the battery separator is punched and formed, it is quickly positioned and moved to the shaping table by the moving mechanism. The upper shaping mold is started to press the battery separator onto the lower shaping mold. The battery separator is kept in the pressing and shaping state for 30s~60s to allow it to cool naturally. The finished battery separator is then taken out. In step (2) or step (3), the temperature compensation Δt is calculated according to the following formula: In the formula, Δt is the compensation temperature, in °C; -- The linear expansion coefficient of the material is given in m / m·℃. -- The linear deformation coefficient for punching stress is given in m / m. In step (2) or step (3), the temperature is set to satisfy T+Δt≤40℃.

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