CN118528529B - A lithium battery diaphragm extension device - Google Patents

Abstract

The present invention relates to an extension device for a lithium battery diaphragm, and to the technical field of lithium battery diaphragm processing and extension; it comprises a work frame and an extension plate arranged on the upper end of the work frame, a stretcher for stretching the lithium battery diaphragm is slidably penetrated on the extension plate, and a heater for real-time heating of the lithium battery diaphragm is also arranged on the stretcher; the present invention can solve the following problems existing in the prior art: first, the prior art only extends the width of the lithium battery diaphragm, which will cause the pores of the lithium battery diaphragm to be deformed after being stretched, thereby affecting the permeability of lithium ions in the pores, and ultimately affecting the performance of the lithium battery diaphragm; secondly, during the extension process of the lithium battery diaphragm, the lithium battery diaphragm in the middle part is prone to wrinkles due to stress during stretching, resulting in inconsistent thicknesses in different intervals of the lithium battery diaphragm.

Description

A lithium battery diaphragm extension device

Technical Field

The present invention relates to the technical field of processing and extending lithium battery diaphragms, and in particular to an extending device for lithium battery diaphragms.

Background Art

Lithium battery separator is one of the key components in lithium batteries, used to isolate the positive and negative electrodes to prevent short circuits and mixing of electrolytes. Lithium battery separators are usually made of polymer materials, such as polypropylene film or polymer composite film. The performance of the separator determines the interface structure and internal resistance of the battery, and directly affects the battery's capacity, cycle and safety performance. Excellent performance separators play an important role in improving the overall performance of the battery.

Therefore, lithium battery separators are particularly important. In the prior art, when lithium battery separators are used, the length and width of the separators may not match the lithium battery, and the length and width of the separators need to be extended.

For example, the Chinese patent with publication number CN115384040B involves a width extension device for lithium battery diaphragm production. It includes a base, a guide rod, a first connecting frame, a first pressing frame and a first elastic member. The top of the base is connected to a workbench, and the front and rear sides of the workbench are connected to guide rods. The first connecting frame is slidably arranged on the left and right sides between the two guide rods, and the first pressing frame is slidably arranged in the first connecting frame. The first pressing frame is sleeved with a first elastic member. Through the cooperation of the servo motor, the screw rod, the first connecting frame and the second connecting frame, the first pressing frame extends the diaphragm outward, the second pressing frames on the left and right sides extend the two sides of the diaphragm for a second time, and the second pressing frame in the middle extends the middle of the diaphragm outward, so that the diaphragm is fully extended.

However, the above-mentioned lithium battery separator extension device still has some shortcomings in actual use:

1. In the above-mentioned prior art, the lithium battery diaphragm can be extended outward by the first lower pressure frame, and the second lower pressure frames on the left and right sides perform secondary extension on both sides of the diaphragm, and the second lower pressure frame in the middle extends the middle part of the diaphragm outward, so that the diaphragm is fully extended. However, only extending the width of the lithium battery diaphragm will cause the pores of the lithium battery diaphragm to deform after extension, thereby affecting the permeability of lithium ions and electrolytes in the pores, and ultimately affecting the performance of the lithium battery diaphragm.

2. Secondly, in the prior art, during the extension process of the lithium battery separator, the lithium battery separator located in the middle part is wrinkled due to the stress during the external force stretching process, which causes the thickness of each part of the lithium battery separator to be inconsistent during the extension process, ultimately affecting the quality of the extension of the lithium battery separator.

Therefore, based on the above-stated viewpoints, there is still room for improvement in the existing extension devices of lithium battery separators.

Summary of the invention

In order to solve the above problems, the present invention provides an extension device for a lithium battery separator.

A lithium battery diaphragm extension device comprises a working frame and an extension plate arranged on the upper end of the working frame, wherein the extension plates are symmetrically distributed on the upper end of the working frame, and two symmetrical extension plates slide relative to each other.

A stretcher for stretching the lithium battery diaphragm is slidably provided on the extension plate, and a heater for heating the lithium battery diaphragm in real time is also provided on the stretcher.

Preferably, vertical brackets are provided at the four corners of the work frame, and symmetrically distributed extended threaded shafts are provided on the vertical brackets along the length direction of the work frame through bearings, and two groups of movable frames that move along the length direction of the work frame are installed on the extended threaded shafts through threaded connections, and the movable frames slide on the extension plates, and a driving motor is connected to one side of the extended threaded shaft to control the rotation of the extended threaded shaft.

Preferably, the stretcher includes an I-shaped stretching block, a 匚-shaped frame and a clamping cylinder. The I-shaped stretching block is respectively inserted between the movable frame and the extension plate, and the extension plate is provided with an extension groove for the sliding of the I-shaped stretching block. The movable frame is also provided with a horizontal groove for the sliding of the I-shaped stretching block, and the extension groove and the horizontal groove are cross-overlapped. The 匚-shaped frame is installed at the bottom of the I-shaped stretching block for clamping the lithium battery diaphragm. The clamping cylinder is arranged at the upper end of the 匚-shaped frame through a support, and the output end of the clamping cylinder passes downward through the 匚-shaped frame and rests on the horizontal frame.

Preferably, a protective clamping assembly is also provided inside the 匚-shaped frame to prevent damage to the contact position between the lithium battery diaphragm and the 匚-shaped frame, and the protective clamping assembly includes a horizontal frame, a clamping roller, a clamping belt and a clamping motor; the horizontal frame is symmetrically arranged on the upper and lower sides of the 匚-shaped frame, the clamping rollers are rotatably distributed on the inner side of the horizontal frame at equal intervals, and the clamping belt is sleeved inside a plurality of clamping rollers on the horizontal frame.

The clamping roller on one side is connected with a clamping motor, and the clamping motor drives the clamping roller to rotate.

Preferably, two symmetrically distributed synchronous gears are rotatably arranged on the side wall of the 匚-shaped frame, and the two synchronous gears are meshed with each other. A connecting rod is connected to both of the synchronous gears, and one end of the connecting rod away from the synchronous gear is respectively connected to the two horizontal frames.

Preferably, the heater includes a heating plate and a heating rod, the heating plate is arranged on a work frame and is used to heat the lithium battery diaphragm, a lifting spring rod is arranged at the bottom of the heating plate, the lifting spring rod is installed at the upper end of the work frame, the heating rod is arranged directly above the work frame, and there is a gap between the heating rod and the table top of the work frame for the lithium battery film to move, the heating rod is attached to the upper surface of the lithium battery film and heats it.

Preferably, the heating rod is also provided with a swinging component for controlling its reciprocating scraping swing, and the swinging component includes a linkage rack, an incomplete gear, a linkage gear and a swinging frame; the upper end of the heating rod is connected to the swinging frame through an auxiliary bracket, and the two ends of the inner side of the swinging frame are rack structures, the incomplete gear is meshed in the swinging frame, the linkage gear is installed on the incomplete gear and protrudes upward, the linkage rack is installed on the working frame, and the linkage rack and the linkage gear are movably meshed.

Preferably, a smoothing component for smoothing the lithium battery diaphragm is also provided at the bottom of the heating rod, and the smoothing component includes a connecting shaft, a first bevel gear, a second bevel gear, a smoothing threaded shaft and a smoothing block. The connecting shaft is arranged below the incomplete gear, and the end of the connecting shaft away from the incomplete gear passes through the heating rod and extends downward, the first bevel gear is arranged at the bottom of the connecting shaft, the second bevel gear is meshed with the first bevel gear, the smoothing threaded shaft is installed at both ends of the first bevel gear and abuts against the side wall of the heating rod, the smoothing block is slidably arranged in the heating rod, and the smoothing block is threadedly connected to the smoothing threaded shaft.

Preferably, an execution gear is provided at the top end of the connecting shaft, an execution rack is meshed on the execution gear, the execution rack is horizontally slidably installed on the working frame, and the execution rack is passed through the swing frame.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The cooperation between the extension plate and the stretcher in the present invention can stretch the length and width of the lithium battery diaphragm at the same time, ensuring that the lithium battery diaphragm is stretched according to a certain ratio, avoiding deformation of the gaps in the lithium battery diaphragm and affecting the performance of the entire lithium battery diaphragm.

2. The present invention heats the lithium battery separator simultaneously through a heating plate and a heating rod, thereby ensuring that the ductility of the lithium battery separator is improved during the extension process and avoiding the lithium battery separator from tearing during the extension process. At the same time, the present invention can reciprocately smooth the surface of the lithium battery separator through the heating rod, thereby ensuring that the lithium battery separator does not wrinkle during extension and also avoiding the lithium battery separator from shrinking after extension.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below in conjunction with the accompanying drawings and embodiments.

FIG1 is a schematic diagram of the main structure of the present invention.

FIG. 2 is a schematic diagram of the structure of the lithium battery separator of the present invention.

FIG. 3 is a schematic diagram of the structure between the working frame and the stretcher of the present invention.

FIG. 4 is a schematic diagram of the structure between the extension plate and the stretcher of the present invention.

FIG. 5 is a schematic diagram of the structure of the protective clamping assembly of the present invention.

FIG. 6 is a schematic structural diagram of the heater of the present invention.

FIG. 7 is an enlarged view of the structure at B in FIG. 6 of the present invention.

FIG. 8 is an exploded view of the structure of the smoothing assembly of the present invention.

FIG. 9 is a schematic structural diagram of the smoothing assembly of the present invention.

In the figure, A, lithium battery separator; 1, lithium battery substrate layer; 2, polymer matrix layer; 3, self-healing agent layer; 4, protective layer; 5, working frame; 6, extension plate; 7, stretcher; 8, heater; 50, vertical bracket; 51, extension threaded shaft; 52, moving frame; 53, driving motor; 70, I-shaped stretching block; 71, 匚-shaped frame; 72, clamping cylinder; 74, extension slot; 75, horizontal slot; 73, protective clamping assembly; 730, horizontal frame; 731, clamping roller; 732, clamping belt; 733, connecting rod; 734, synchronous gear; 735, clamping motor; 60, two-way adjustable threaded rod; 61, synchronous belt; 80, heating plate; 81, heating rod; 83, lifting spring rod; 82, swing component; 820, linkage rack; 821, incomplete gear; 822, linkage gear; 823, swing frame; 9, smoothing assembly; 90, connecting shaft; 91, No. 1 bevel gear; 92, No. 2 bevel gear; 93, smoothing threaded shaft; 94, smoothing block; 95, execution gear, 96, execution rack.

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail below with reference to FIGS. 1 to 9 , but the present invention can be implemented in many different ways as defined and covered by the claims.

1 and 2, the present invention proposes a lithium battery separator A that can effectively isolate the positive and negative electrodes of a lithium battery to ensure the stability of the lithium battery; it includes a lithium battery substrate layer 1, a polymer matrix layer 2, a self-healing agent layer 3 and a protective layer 4, both ends of the lithium battery substrate layer 1 are paved with a polymer matrix layer 2 that completely covers the entire lithium battery substrate layer 1, the polymer matrix is the main body of the lithium battery separator A, the self-healing agent layer 3 is adhered to both sides of the polymer matrix layer 2, the additive can promote the chemical reaction and reconnection of the self-healing polymer, and improve the self-healing speed and effect, the protective layer 4 is arranged on the outside of the self-healing agent layer 3, and is used to protect the entire lithium battery substrate layer 1, the polymer matrix layer 2 and the self-healing agent layer 3, and a protective layer 4 is also arranged between the polymer matrix layer 2 and the self-healing agent layer 3 to play an isolation role.

In the prior art, the traditional lithium battery separator A can be placed between the positive and negative electrodes of the lithium battery to isolate the positive and negative electrode materials of the lithium battery and prevent the lithium battery from short-circuiting and mixing of the electrolyte.

However, in the prior art, when a lithium battery is subjected to destructive accidents such as collision and puncture, the lithium battery separator A that plays an isolating role in the lithium battery will be damaged, which will cause the lithium battery to short-circuit and cause the battery to catch fire and smoke, and even more seriously, the fire will be out of control.

The lithium battery separator A in the present invention adds a polymer matrix layer 2 and a self-healing agent layer 3. When the battery is not damaged, the polymer matrix layer 2 and the self-healing agent layer 3 are isolated by a protective layer 4 to avoid premature mixing between the polymer matrix layer 2 and the self-healing agent layer 3, which would lead to performance degradation.

When the battery is damaged, the positive and negative electrode materials inside the battery will come into contact through the damaged point of the lithium battery, causing fire and smoke, and making it uncontrollable; at the same time, not only the positive and negative electrodes of the lithium battery will come into contact, but the polymer matrix layer 2 and the self-healing agent layer 3 in the lithium battery separator A will also come into contact through the damaged point of the lithium battery. At this time, under the catalysis of the self-healing agent, the activity of the polymer matrix is quickly activated, and it can ensure that the polymers react quickly to block the damaged areas, thereby avoiding continuous contact between the positive and negative electrodes of the lithium battery. After the positive and negative electrode materials of the lithium battery are blocked by the polymer between the polymer matrix layer 2 and the self-healing agent layer 3, the positive and negative electrode materials tend to be stable, avoiding the occurrence of disasters, and more professional treatment can be performed later.

The self-healing polymer in the polymer matrix layer 2 is a key material for realizing the self-healing function. These polymers have special chemical bonds that can reconnect at the damaged site and restore the original structure. Commonly used self-healing polymers include polyurethane, polyamide, polyimide, etc.

Embedding nanoparticles into the polymer matrix in the polymer matrix layer 2 will form a self-healing layer. When the lithium battery separator A is damaged, the self-healing layer can be quickly repaired to prevent electrolyte leakage inside the battery and the degradation of battery performance; nanoparticles are introduced into the polymer matrix in the polymer matrix layer 2 to enhance the mechanical properties and stability of the material. Commonly used nanoparticles include silicon dioxide, zinc oxide, carbon nanotubes, etc. These nanoparticles can interact with the self-healing polymer on the polymer matrix in the polymer matrix layer 2 to form a composite structure.

The self-repairing agent layer 3 is mainly composed of self-repairing agents, and its main function is to add some self-repairing agents to the polymer matrix in the polymer matrix layer 2 in order to enhance the self-repairing effect. These agents can promote the chemical reaction and reconnection of the self-repairing polymer, and improve the self-repairing speed and effect. Commonly used self-repairing agents include cross-linking agents, catalysts, solvents, etc.

The embodiment of the present application discloses a stretching device for a lithium battery diaphragm, which explains that the stretching device for the lithium battery diaphragm is mainly used in the production and processing of the lithium battery diaphragm A. In terms of technical effect, it can avoid the problem that the lithium battery diaphragm A will automatically shrink within a period of time after stretching due to its own material, thereby causing the stretching effect of the diaphragm that has been stretched to deteriorate.

Secondly, in the prior art, during the extension process of the lithium battery separator A, the lithium battery separator A located in the middle part is wrinkled due to the stress during the external force stretching process, which causes the thickness of each part of the lithium battery separator A to be inconsistent during the extension process, affecting the extension quality of the lithium battery separator A.

Embodiment 1

Referring to Figure 1, it is a structural schematic diagram of stretching the lithium battery diaphragm A in this embodiment; the above-mentioned lithium battery diaphragm A also needs to use a special lithium battery diaphragm A stretching device during the production process, and the stretching device of the lithium battery diaphragm A includes a working frame 5 and an extension plate 6 arranged at the upper end of the working frame 5, the extension plates 6 are symmetrically distributed at the upper end of the working frame 5, and the two symmetrical extension plates 6 slide relative to each other; a stretcher 7 for stretching the lithium battery diaphragm A is slidably penetrated on the extension plate 6, and the stretcher 7 is also provided with a heater 8 for real-time heating of the lithium battery diaphragm A.

Stretching the lithium battery separator A can make the lithium battery separator A form more micropores or pores, thereby increasing the porosity of the lithium battery separator A; at the same time, it can also improve the thermal stability of the lithium battery separator A: stretching can make the lithium battery separator A form a more uniform fiber structure, thereby improving the thermal stability of the lithium battery separator A.

Therefore, the extension of the lithium battery separator A is particularly important; the lithium battery separator A extension device mainly extends the width of the lithium battery separator A through the cooperation of the stretcher 7 and the extension plate 6; the main function of the heater 8 is to heat the lithium battery separator A, improve the smoothness of the extension of the lithium battery separator A, and avoid tearing of the lithium battery separator A.

Refer to Figures 3 and 4, which are schematic diagrams of the structure for stretching the lithium battery diaphragm A in this embodiment; specifically, vertical brackets 50 are provided at the four corners of the working frame 5, and symmetrically distributed extended threaded shafts 51 are provided on the vertical brackets 50 through bearings along the length direction of the working frame 5, and two groups of movable frames 52 are installed on the extended threaded shafts 51 through threaded connections, and the movable frames 52 are slidably distributed on the extension plate 6, and a driving motor 53 is connected to one side of the extended threaded shaft 51 to control the rotation of the extended threaded shaft 51.

It should be noted that the extended threaded shaft 51 is a bidirectional threaded structure, which is used to control the movement of the moving frame 52 .

First, lay the lithium battery diaphragm A to be processed on the work table at the upper end of the work frame 5. During this process, it is necessary to ensure that the corners of the lithium battery diaphragm A can be inserted into the 匚-shaped frame 71 for fixation, and then start the drive motor 53. The drive motor 53 drives the extension thread shaft 51 to rotate, and the two groups of extension plates 6 symmetrically arranged along the length direction of the extension thread shaft 51 will move relative to each other, so that the lithium battery diaphragm A will be stretched along the length direction of the work frame 5. During this process, the stretcher 7 on the extension plate 6 will stretch the lithium battery diaphragm A in the width direction.

In the present invention, the lithium battery separator A is stretched in both length and width directions, which can effectively prevent the micropores or pores in the lithium battery separator A from being deformed, thereby affecting the performance of the lithium battery.

By simultaneously stretching the lithium battery separator A in two directions, the stability of the extension of the lithium battery separator A can be greatly guaranteed. When the lithium battery separator A is stretched, its original performance will not be affected. On the contrary, its performance can be effectively improved. When isolating the positive and negative electrodes of the lithium battery, the passage rate of lithium ions and electrolyte is increased.

If the lithium battery separator A does not extend in proportion, the pores in the lithium battery separator A will be deformed, affecting the permeability of lithium ions and electrolyte per unit time, and ultimately causing the effect of the lithium battery separator A to deteriorate, affecting the safety of the lithium battery.

Referring to FIG. 4 , it is a schematic diagram of the structure for stretching the width of the lithium battery diaphragm A in the stretcher 7; the stretcher 7 comprises an I-shaped stretching block 70, a 匚-shaped frame 71 and a clamping cylinder 72, the I-shaped stretching block 70 is respectively passed through the movable frame 52 and the extension plate 6, and the extension plate 6 is provided with an extension groove 74 for the sliding movement of the I-shaped stretching block 70, the movable frame 52 is also provided with a horizontal groove 75 for the sliding movement of the I-shaped stretching block 70, and the extension groove 74 and the horizontal groove 75 are cross-overlapped, the 匚-shaped frame 71 is fixed to the bottom of the I-shaped stretching block 70, and is used to clamp the lithium battery diaphragm A, the clamping cylinder 72 is arranged at the upper end of the 匚-shaped frame 71 through a support, and the output end of the clamping cylinder 72 passes downward through the 匚-shaped frame 71 and abuts against the horizontal frame 730.

After the lithium battery diaphragm A is placed into the 匚-shaped frame 71, the clamping cylinder 72 moves downward. At this time, the output end of the clamping cylinder 72 is downward, and the output end of the clamping cylinder 72 and the 匚-shaped frame 71 clamp the lithium battery diaphragm A to ensure that the entire lithium battery diaphragm A can be fixed by the 匚-shaped frame 71. At this time, when the movable frame 52 moves outward, the length direction of the lithium battery diaphragm A can be stretched. At the same time, when the movable frame 52 moves outward, with the cooperation of the I-shaped stretching block 70, the width direction of the lithium battery diaphragm A is also stretched synchronously.

It should be noted that one end of the extension groove 74 on the extension plate 6 is a horizontal structure and the other end is an inclined outward structure. Its function is to enable the I-shaped stretching block 70 to cooperate with the U-shaped frame 71 to stretch the lithium battery diaphragm A during the movement of the I-shaped stretching block 70 in the extension groove 74.

In the above-mentioned process, the output end of the clamping cylinder 72 directly contacts and clamps the lithium battery diaphragm A, which will cause irreversible damage to the position where the lithium battery diaphragm A contacts the clamping cylinder 72, and the position where the lithium battery diaphragm A contacts the clamping cylinder 72 cannot be extended. In order to solve the above-mentioned problem, this embodiment proposes a protective clamping assembly 73.

As shown in Figure 5, specifically, the interior of the 匚-shaped frame 71 is also provided with a protective clamping assembly 73 that can prevent the lithium battery diaphragm A from being easily damaged at the contact position with the 匚-shaped frame 71. The protective clamping assembly 73 includes a horizontal frame 730, a clamping roller 731, a clamping belt 732, a connecting rod 733 and a synchronous gear 734; the horizontal frame 730 is symmetrically arranged on the upper and lower sides of the 匚-shaped frame 71, the clamping rollers 731 are rotatably distributed on the inner side of the horizontal frame 730 at equal intervals, and the clamping belt 732 is sleeved on a plurality of clamping rollers 731 on the horizontal frame 730.

The synchronous gears 734 are symmetrically mounted on the side walls of the 匚-shaped frame 71, and the two synchronous gears 734 are meshed with each other. The connecting rods 733 are respectively arranged on the two synchronous gears 734, and the ends of the connecting rods 733 away from the synchronous gears 734 are respectively hinged to the two horizontal frames 730.

After the lithium battery diaphragm A is placed into the 匚-shaped frame 71, in order to avoid irreversible damage to the lithium battery diaphragm A due to squeezing, after the lithium battery diaphragm A is placed into the 匚-shaped frame 71, the clamping cylinder 72 is started again. At this time, the output end of the clamping cylinder 72 will not directly contact the lithium battery diaphragm A. At this time, the output end of the clamping cylinder 72 will squeeze the horizontal frame 730, and the clamping belt 732 on the horizontal frame 730 will synchronously approach the lithium battery diaphragm A with the cooperation of the synchronous gear 734 and the connecting rod 733 until the lithium battery diaphragm A is fixed by the two clamping belts 732. At this time, not only can the lithium battery diaphragm A be clamped and fixed, but also the clamped area of the lithium battery diaphragm A can be stretched for a second time to avoid inconsistent thickness between the edge and the middle of the lithium battery diaphragm A.

Refer to Figure 6, which is a structural schematic diagram of heating the lithium battery diaphragm A during the stretching process of the lithium battery diaphragm A in this embodiment; specifically, the heater 8 includes a heating plate 80 and a heating rod 81, the heating plate 80 is arranged on the working frame 5, and the lithium battery diaphragm A is heated, and a lifting spring rod 83 is arranged at the bottom of the heating plate 80, and the lifting spring rod 83 is installed at the upper end of the working frame 5, the heating rod 81 is arranged directly above the working frame 5, and there is a gap between the heating rod 81 and the table top of the working frame 5 for the lithium battery diaphragm A to move, and the heating rod 81 can be attached to the upper surface of the lithium battery diaphragm A and heat it.

During the specific implementation process, first, the lithium battery diaphragm A is placed on the working frame 5, and the heating plate 80 starts to heat. The heating plate 80 heats the lithium battery diaphragm A from the bottom to ensure that the lithium battery diaphragm A is at a suitable temperature. It should be noted that during the heating process of the lithium battery diaphragm A, the temperature of the lithium battery diaphragm A needs to be controlled. If the temperature is too low, the effect of stretching the lithium battery diaphragm A will be poor; when the temperature is too high, the performance of the lithium battery diaphragm A will be damaged.

When the heating plate 80 heats the lithium battery separator A from the bottom, the heating rod 81 contacts the upper end of the lithium battery separator A, and the heating rod 81 can swing to massage the upper end surface of the lithium battery separator A to avoid wrinkles in the middle of the lithium battery separator A and to avoid tearing of the width of the lithium battery separator A during extension.

7 and 8, which are schematic diagrams of the structure for smoothing the lithium battery diaphragm A while heating it in this embodiment; specifically, the heating rod 81 is also provided with a swinging component 82 for controlling its reciprocating scraping and swinging, and the swinging component 82 includes a linkage rack 820, an incomplete gear 821, a linkage gear 822 and a swinging frame 823; the upper end of the heating rod 81 is connected to the swinging frame 823 through an auxiliary bracket, and the two ends of the inner side of the swinging frame 823 are rack structures, the incomplete gear 821 is meshed in the swinging frame 823, the linkage gear 822 is installed on the incomplete gear 821 and protrudes upward, the linkage rack 820 is installed on the working frame 5, and the linkage rack 820 and the linkage gear 822 are movably meshed.

During the specific implementation process, when the moving frame 52 moves outward, the linkage gear 822 will mesh with the linkage rack 820 on the working frame 5. At this time, the linkage gear 822 will rotate rapidly, and the linkage gear 822 will drive the incomplete gear 821 to rotate when it rotates. During the rotation process, the incomplete gear 821 will drive the swing frame 823 on its outside to move back and forth along the width direction of the working frame 5, and the heating rod 81 is connected to the swing frame 823, so the heating rod 81 scrapes back and forth along the surface of the lithium battery diaphragm A to smooth the lithium battery diaphragm A and avoid wrinkles on the upper end of the lithium battery diaphragm A.

7, 8 and 9, in order to further ensure the heating stability of the lithium battery diaphragm A by the heating rod 81 and improve the efficiency of the lithium battery diaphragm A in the process of reciprocating smoothing, the present invention also proposes a smoothing component 9; the bottom of the heating rod 81 is also provided with a smoothing component 9 for smoothing the lithium battery diaphragm A in the length direction, and the smoothing component 9 includes a connecting shaft 90, a first bevel gear 91, a second bevel gear 92, a smoothing threaded shaft 93 and a smoothing block 94, and the connecting shaft 90 is connected to the heating rod 81. The shaft 90 is fixedly mounted on the incomplete gear 821, and the end of the connecting shaft 90 away from the incomplete gear 821 passes through the heating rod 81 and extends downward. The No. 1 bevel gear 91 is arranged at the bottom of the connecting shaft 90, and the No. 2 bevel gear 92 is meshed with the No. 1 bevel gear 91. The smoothing threaded shaft 93 is installed at both ends of the No. 1 bevel gear 91 and abuts against the side wall of the heating rod 81. The smoothing block 94 is slidably arranged in the heating rod 81, and the smoothing block 94 is threadedly connected to the smoothing threaded shaft 93.

An execution gear 95 is provided at the top of the connecting shaft 90, and an execution rack 96 is meshed on the execution gear 95. The execution rack 96 is horizontally slidably installed on the working frame 5, and the execution rack 96 is penetrated by the swing frame 823; the cooperation between the execution gear 95 and the execution rack 96 is to ensure that the connecting shaft 90 can rotate and avoid interference between the connecting shaft 90 and the swing frame 823. When the entire swing frame 823 moves back and forth, the swing frame 823 drives the execution rack 96 to reciprocate synchronously. At the same time, the execution gear 95, which is always meshed with the execution rack 96, also rotates and meshes along the execution rack 96 while it swings. At this time, the execution gear 95 drives the connecting shaft 90 to rotate, and the connecting shaft 90 drives the No. 1 bevel gear 91 to rotate.

It should be noted that the heating rod 81 is a hollow structure. The heating rod 81 and the heating plate 80 can heat the lithium battery diaphragm A after being powered on, but the temperature is monitored in real time to prevent the temperature from being too high or too low, which would damage the performance of the lithium battery diaphragm A.

When the incomplete gear 821 rotates, the incomplete gear 821 drives the first bevel gear 91 to rotate through the cooperation of the connecting shaft 90, the execution gear 95 and the execution rack 96, and the first bevel gear 91 drives the second bevel gear 92 to rotate, but the second bevel gear 92 is fixedly connected with a smoothing threaded shaft 93; therefore, the smoothing threaded shaft 93 can rotate, and at the same time, the smoothing block 94 on the smoothing threaded shaft 93 moves back and forth left and right along the length direction of the heating rod 81, so that the smoothing block 94 smoothes and stretches the lithium battery diaphragm A in the length direction, and at the same time, the heating rod 81 smoothes and stretches the lithium battery diaphragm A in the width direction, which can effectively avoid the lithium battery diaphragm A from wrinkling during the extension process.

The present invention heats the lithium battery diaphragm A simultaneously through the heating plate 80 and the heating rod 81, thereby ensuring that the ductility of the lithium battery diaphragm A is improved during the extension process and avoiding the lithium battery diaphragm A from tearing during the extension process. At the same time, the present invention can reciprocally smooth the surface of the lithium battery diaphragm A through the heating rod 81, thereby ensuring that the lithium battery diaphragm A does not wrinkle when it is extended, and also avoiding the lithium battery diaphragm A from shrinking after extension.

Embodiment 2:

On the basis of the first embodiment, in order to further improve the adaptability of the present invention to the extension of the lithium battery separator A, the present invention proposes a bidirectional adjustment threaded rod 60 capable of adjusting the spacing between the extension plates 6 .

Referring back to FIG. 3 and FIG. 4 , a bidirectionally adjustable threaded rod 60 capable of adjusting the distance between the two extension plates 6 is provided between the two extension plates 6. The bidirectionally adjustable threaded rod 60 is arranged on the upper end of the working frame 5 by rotating through a vertical frame. The two extension plates 6 are arranged on the bidirectionally adjustable threaded rod 60 by threaded connection. A synchronous belt 61 is sleeved between the two bidirectionally adjustable threaded rods 60.

During the specific implementation process, the two-way adjustment threaded rod 60 on one side is rotated, and the two-way adjustment threaded rod 60 on the other side is driven by the synchronous belt 61, so that the two two-way adjustment threaded rods 60 can rotate synchronously. During this process, the two sets of extension plates 6 threadedly connected on the two two-way adjustment threaded rods 60 are adjusted in distance.

The lithium battery separator A stretching device of the present invention can not only stretch lithium battery separators A of one size, but also stretch lithium battery separators A of different sizes, which greatly improves the adaptability of the present invention.

During operation: In the first step, the lithium battery separator A is placed in the lithium battery; when the lithium battery is damaged, the positive and negative electrode materials inside the lithium battery will catch fire and smoke due to contact. At this time, not only the positive and negative electrodes of the lithium battery are in contact, but also the polymer matrix layer 2 and the self-healing agent layer 3 in the lithium battery separator A are in contact. At this time, under the catalysis of the self-healing agent, not only the activity of the polymer matrix can be activated, but also the damaged areas between the polymers can be quickly blocked, thereby avoiding continuous contact and reaction between the positive and negative electrodes of the lithium battery, which leads to continuous occurrence of disasters.

Step 2: When the lithium battery diaphragm A is being produced, the lithium battery diaphragm A to be processed is first laid on the work table at the upper end of the work frame 5, and then the corners of the lithium battery diaphragm A are inserted into the 匚-shaped frame 71 for fixation, and then the drive motor is started, and the two groups of extension plates 6 will move relative to each other, so that the lithium battery diaphragm A is stretched along the length direction of the work frame 5. During this process, the stretcher 7 on the extension plate 6 will stretch the lithium battery diaphragm A in the width direction to achieve proportional extension of the lithium battery diaphragm A.

Step 3: After the lithium battery diaphragm A to be processed is laid on the work surface at the upper end of the work frame 5, the heating plate 80 starts to heat. The heating plate 80 heats the lithium battery diaphragm A from the bottom to ensure that the lithium battery diaphragm A is at a suitable temperature. It should be noted that during the heating process of the lithium battery diaphragm A, the temperature of the lithium battery diaphragm A needs to be controlled. If the temperature is too low, the effect of stretching the lithium battery will be poor; when the temperature is too high, the performance of the lithium battery diaphragm A will be damaged.

Step 4: After the heating plate 80 heats the lithium battery separator A from the bottom, the heating rod 81 contacts the upper end of the lithium battery separator A, and the heating rod 81 can swing to massage the upper end surface of the lithium battery separator A to avoid wrinkles in the middle of the lithium battery separator A and to avoid tearing of the width of the lithium battery separator A during the extension process.

Step 5: Rotate the two-way adjustment threaded rod 60 on one side, and the two-way adjustment threaded rod 60 on the other side is driven by the synchronous belt 61, so that the two two-way adjustment threaded rods 60 can rotate synchronously. In this process, the two sets of extension plates 6 threadedly connected on the two two-way adjustment threaded rods 60 are adjusted in distance; because the lithium battery diaphragm A extension device in the present invention can not only extend lithium battery diaphragms A of one size, but also extend lithium battery diaphragms A of different sizes, which greatly improves the adaptability of the present invention.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims (6)

1. An extension device of lithium cell diaphragm, its characterized in that: the device comprises a working frame (5) and extension plates (6) arranged at the upper ends of the working frame (5), wherein the extension plates (6) are symmetrically distributed at the upper ends of the working frame (5), and the two symmetrical extension plates (6) slide relatively;

A stretcher (7) for stretching the lithium battery diaphragm is arranged on the extension plate (6) in a sliding way, and a heater (8) for heating the lithium battery diaphragm in real time is also arranged on the stretcher (7);

The heater (8) comprises a heating plate (80) and a heating rod (81), the heating plate (80) is arranged on the working frame (5) and is used for heating a lithium battery diaphragm, a lifting spring rod (83) is arranged at the bottom of the heating plate (80), the lifting spring rod (83) is arranged at the upper end of the working frame (5), the heating rod (81) is arranged right above the working frame (5), a gap for the lithium battery diaphragm to move is reserved between the heating rod (81) and the table top of the working frame (5), and the heating rod (81) is attached to the upper surface of the lithium battery diaphragm and is used for heating the lithium battery diaphragm;

The heating rod (81) is further provided with a swinging part (82) for controlling the reciprocating scraping swinging of the heating rod, and the swinging part (82) comprises a linkage rack (820), an incomplete gear (821), a linkage gear (822) and a swinging frame (823); the upper end of the heating rod (81) is connected with a swinging frame (823) through an auxiliary bracket, two ends of the inner side of the swinging frame (823) are of rack structures, the incomplete gear (821) is meshed in the swinging frame (823), the linkage gear (822) is arranged on the incomplete gear (821) and protrudes upwards, the linkage rack (820) is arranged on the working frame (5), and the linkage rack (820) is movably meshed with the linkage gear (822);

The bottom of heating rod (81) still is provided with and smoothes subassembly (9) to lithium cell diaphragm, smoothes subassembly (9) including connecting axle (90), no. one bevel gear (91), two bevel gears (92), smoothes screw thread axle (93) and smoothes piece (94), the below of incomplete gear (821) is located to connecting axle (90) to the one end that incomplete gear (821) was kept away from to connecting axle (90) runs through heating rod (81) downwardly extending, no. one bevel gear (91) locates the bottom of connecting axle (90), two bevel gears (92) mesh on No. one bevel gear (91), smoothes screw thread axle (93) and installs on the both ends of No. one bevel gear (91) and support on the lateral wall of heating rod (81), smoothes piece (94) and locates in heating rod (81) to smoothes piece (94) and smoothes screw thread axle (93).

2. The extension device of a lithium battery separator according to claim 1, wherein: four corners of work frame (5) are provided with perpendicular support (50), be provided with extension screw thread axle (51) of symmetric distribution along the length direction of work frame (5) on perpendicular support (50) through the bearing, install two sets of movable frame (52) that remove along the length direction of work frame (5) jointly through threaded connection's mode on extension screw thread axle (51), movable frame (52) slide on extension board (6) to one side of extension screw thread axle (51) is connected with driving motor (53), is used for controlling the rotation of extension screw thread axle (51).

3. The extension device of a lithium battery separator according to claim 2, wherein: the stretcher (7) comprises an I-shaped stretching block (70), a 匚 -shaped frame (71) and a clamping cylinder (72), wherein the I-shaped stretching block (70) is respectively arranged between the movable frame (52) and the stretching plate (6) in a penetrating mode, the stretching plate (6) is provided with a stretching groove (74) for the sliding of the I-shaped stretching block (70), the movable frame (52) is also provided with a horizontal groove (75) for the sliding of the I-shaped stretching block (70), the stretching groove (74) and the horizontal groove (75) are overlapped in a crossing mode, the 匚 -shaped frame (71) is arranged at the bottom of the I-shaped stretching block (70) and used for clamping a lithium battery diaphragm, the clamping cylinder (72) is arranged at the upper end of the 匚 -shaped frame (71) through a supporting seat, and the output end of the clamping cylinder (72) downwards penetrates through the 匚 -shaped frame (71) to be abutted against the horizontal frame (730).

4. A lithium battery separator extension device according to claim 3, wherein: the inside of 匚 shape frame (71) is also provided with a protective clamping component (73) for preventing the contact position of the lithium battery diaphragm and 匚 shape frame (71) from being damaged, and the protective clamping component (73) comprises a horizontal frame (730), a clamping roller (731), a clamping belt (732) and a clamping motor (735); the horizontal frame (730) is symmetrically arranged on the upper side and the lower side of the 匚 -shaped frame (71), the clamping rollers (731) are uniformly and rotatably distributed on the inner side of the horizontal frame (730), and the clamping belts (732) are sleeved in the clamping rollers (731) on the horizontal frame (730);

one side of the clamping roller (731) is connected with a clamping motor (735), and the clamping motor (735) drives the clamping roller (731) to rotate.

5. The extension device for a lithium battery separator according to claim 4, wherein: and the side walls of the 匚 -shaped frames (71) are rotationally provided with two symmetrically distributed synchronous gears (734), the two synchronous gears (734) are meshed with each other, the two synchronous gears (734) are connected with connecting rods (733), and one ends of the connecting rods (733) far away from the synchronous gears (734) are respectively connected with the two horizontal frames (730).

6. The extension device of a lithium battery separator according to claim 1, wherein: an execution gear (95) is arranged at the top end of the connecting shaft (90), an execution rack (96) is meshed with the execution gear (95), the execution rack (96) is horizontally and slidably arranged on the working frame (5), and the execution rack (96) is arranged on the swinging frame (823) in a penetrating mode.