Lithium battery separator stretching device

Abstract

The application provides a lithium battery diaphragm stretching device, and relates to lithium battery production equipment. The lithium battery diaphragm stretching device comprises a rack, an unwinding mechanism, a stretching mechanism and a winding mechanism. The unwinding mechanism, the stretching mechanism and the winding mechanism are sequentially arranged on the rack. The stretching mechanism comprises at least two groups of stretching assemblies. At least one of the stretching assemblies can move along the vertical direction relative to the rack. The movable stretching assembly and other stretching assemblies have a height difference in the vertical direction. In this embodiment, the height difference between the stretching assemblies is controlled by controlling the vertical movement of the stretching assemblies, so that the angle can be flexibly adjusted, the molecular chains of the diaphragm material are orderly arranged along the preset direction, and local stress concentration caused by the fixed angle is avoided.

Description

Technical Field

[0001] This application relates to the field of lithium battery separator production equipment, and more specifically, to a lithium battery separator stretching device. Background Technology

[0002] With the rapid development of lithium battery technology, the lithium battery separator, as a key component, directly affects the safety and energy density of the battery. In the production process of lithium battery separators, the stretching process is a crucial step in determining the uniformity of the separator's microstructure and its mechanical properties. Traditional stretching processes typically use a set of stretching rollers at a fixed angle to stretch the separator, making it impossible to dynamically adjust the stretching angle. This leads to difficulties in matching the optimal stretching direction when dealing with separators of different thicknesses or substrates, easily resulting in problems such as disordered molecular chain orientation and uneven micropore distribution.

[0003] To address the aforementioned issues, a lithium battery separator stretching device is proposed. Utility Model Content

[0004] The purpose of this application is to provide a lithium battery separator stretching device that can guide the molecular chains of the separator material to arrange themselves in an orderly manner along a preset direction, thereby avoiding local stress concentration caused by a fixed angle.

[0005] This utility model provides a lithium battery separator stretching device, which includes a frame, an unwinding mechanism, a stretching mechanism, and a winding mechanism. The unwinding mechanism, the stretching mechanism, and the winding mechanism are sequentially mounted on the frame. The stretching mechanism includes at least two sets of stretching components, at least one set of stretching components is movable relative to the frame in a vertical direction, and there is a vertical height difference between the movable stretching component and the other stretching components.

[0006] In an optional embodiment, the device further includes a lifting drive mechanism and two sets of lead screw transmission mechanisms. The tensioning assembly is installed between the two sets of lead screw transmission mechanisms. Each set of lead screw transmission mechanisms is connected to the output end of the lifting drive mechanism. Under the driving action of the lifting drive mechanism, the lead screw transmission mechanism drives the tensioning assembly to move in the vertical direction.

[0007] In an optional embodiment, the lifting drive mechanism includes a lifting drive component, a worm gear, and two worm wheels. The lifting drive component is mounted on the frame. The worm gear is fixedly connected to the lifting drive component and rotatably connected to the frame. The two worm wheels are respectively fixedly connected to the two ends of the worm gear along its axial direction. The input end of each set of screw transmission mechanisms is fixedly connected to the worm wheel on the same side.

[0008] In an optional embodiment, each set of lead screw drive mechanisms includes a lead screw and a mounting base. The lead screw is fixedly connected to the worm gear on the same side, and the lead screw is threadedly connected to the mounting base on the same side. The two ends of the tensioning assembly are respectively fixedly connected to the two mounting bases.

[0009] In an optional embodiment, each of the stretching components includes a stretching drive and two stretching rollers, the two stretching rollers being spaced apart in the vertical direction and defining a diaphragm stretching channel, and at least one of the stretching rollers being connected to the output end of the stretching drive.

[0010] In an optional embodiment, the lithium battery separator stretching device further includes an automatic adjustment mechanism. In each set of stretching components, at least one stretching roller is provided with a pair of automatic adjustment mechanisms at both ends of its axial direction. The automatic adjustment mechanism includes a connector, a guide post, and a first elastic element. The stretching roller connected to the stretching drive is defined as the first stretching roller, and the stretching roller not connected to the stretching drive is defined as the second stretching roller. The frame is provided with a first sliding groove and a second sliding groove communicating with the first sliding groove. The connector is placed in the first sliding groove and fixedly connected to the second stretching roller. The guide post is placed in the second sliding groove and fixedly connected to the connector. The first elastic element is supported vertically on the connector and the upper wall of the first sliding groove.

[0011] In an optional embodiment, the lithium battery separator stretching device further includes a quick-release mechanism, which is mounted on the unwinding mechanism and the frame, and / or the quick-release mechanism is mounted on the winding mechanism and the frame.

[0012] In an optional embodiment, one of the quick-release mechanisms is disposed at one end of the unwinding mechanism, and the other end of the unwinding mechanism is rotatably connected to the frame; and / or, one of the quick-release mechanisms is disposed at the end of the winding mechanism, and the other end of the winding mechanism is rotatably connected to the frame.

[0013] In an optional embodiment, two pairs of quick-release mechanisms are respectively disposed at both ends of the unwinding mechanism, and / or two pairs of quick-release mechanisms are respectively disposed at both ends of the winding mechanism. Each quick-release mechanism includes two sets of oppositely disposed quick-release components. The two sets of quick-release mechanisms are symmetrically arranged in the vertical direction, and each set of quick-release components includes a moving member and a second elastic member. The frame is provided with a slide groove, and the moving member is slidably disposed in the slide groove in the vertical direction. The second elastic member is supported by the moving member and the groove wall. The unwinding mechanism and / or the winding mechanism are provided with a snap-fit ​​groove that matches the moving member. The number of snap-fit ​​grooves is the same as the number of moving members and corresponds one-to-one. Under the action of the second elastic member, the moving member engages with the snap-fit ​​groove.

[0014] In an optional embodiment, each of the moving parts is further provided with a pulling part, which protrudes from the frame.

[0015] Compared to existing technologies, the beneficial effects of this application are: This embodiment controls the height difference between the stretching components by controlling the vertical movement of the stretching components, thereby achieving flexible angle adjustment and guiding the molecular chains of the membrane material to arrange themselves in an orderly manner along a preset direction, avoiding local stress concentration caused by a fixed angle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural schematic diagram of the lithium battery separator stretching device is shown in some embodiments; Figure 2 Schematic diagrams of the connection between the frame and the tensioning mechanism are shown in some embodiments; Figure 3 It shows Figure 2 Enlarged view of section A in the middle; Figure 4 It shows Figure 2 Enlarged view of section B in the middle; Figure 5 The diagram shows the connection between the frame and the unwinding roller and quick-release mechanism in some embodiments; Figure 6 It shows Figure 5 Enlarged view of section C.

[0018] Explanation of key component symbols: 100 - Frame; 110 - First sliding groove; 120 - Second sliding groove; 130 - Rotating block; 131 - Sliding groove; 200 - Unwinding mechanism; 210 - Unwinding roller; 211 - Snap-fit ​​groove; 300 - Stretching mechanism; 300a - Stretching drive component; 300b - Stretching roller; 3001 - First stretching roller; 3002 - Second stretching roller; 310 - First set of stretching components; 311 - First drive component; 320 - Second set of stretching components; 321 - Second drive component; 400 - Rewinding mechanism; 410-Rewinding drive; 420-Rewinding roller; 500-Lifting drive mechanism; 510-Lifting drive component; 520-Worm gear; 530-Worm wheel; 600-Screw drive mechanism; 610-Screw; 620-Mounting base; 700-Automatic adjustment mechanism; 710-Connector; 720-Guide post; 730-First elastic element; 800-Quick release mechanism; 810-Quick release assembly; 811-Moving part; 8111-Abutting part; 8112-Pulling part; 812-Second elastic element. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Example 1 This embodiment is applicable to the stretching of lithium battery separators. Before and after stretching, the lithium battery separator has a rolled structure.

[0025] Please see Figure 1 This embodiment provides a lithium battery separator stretching device, which includes a frame 100, an unwinding mechanism 200, a stretching mechanism 300, and a winding mechanism 400, which are sequentially mounted on the frame 100.

[0026] The unwinding mechanism 200 includes an unwinding roller 210, which is mounted on the frame 100.

[0027] Please see Figure 1 and Figure 2 The tensioning mechanism 300 includes at least two sets of tensioning components, at least one set of tensioning components is capable of moving vertically relative to the frame 100, and when moved into position, there is a vertical height difference between the movable tensioning component and the other tensioning components.

[0028] In this embodiment, the number of stretching components can be set to two sets. One set of stretching components can move vertically relative to the frame 100, while the other set of stretching components remains stationary. Specifically, the movable set of stretching components is positioned close to the winding mechanism 400 relative to the other set of stretching components.

[0029] For ease of description and understanding, in this embodiment, a set of stretching components near the unwinding mechanism 200 is defined as the first set of stretching components 310, and a set of stretching components (stretching components that can be raised and lowered) near the winding mechanism 400 is defined as the second set of stretching components 320. After the diaphragm roll is unwound on the unwinding mechanism 200, the diaphragm passes through the first set of stretching components 310 and the second set of stretching components 320 in sequence, and is then wound up at the winding mechanism 400.

[0030] Each stretching assembly includes a stretching drive 300a and two stretching rollers 300b. The two stretching rollers 300b are arranged vertically at intervals and define a diaphragm stretching channel. At least one stretching roller 300b is drivenly connected to the output end of the stretching drive 300a. In this embodiment, the stretching drive 300a of the first stretching assembly 310 can be set as the first drive 311, and the stretching drive 300a of the second stretching assembly 320 can be set as the second drive 321. The rotational speed of the first drive 311 is set to be slower than that of the second drive 321. The speed difference between the two drives generates a continuous and controllable stretching force on the diaphragm, ensuring that the diaphragm is uniformly stretched during transmission and avoiding problems such as insufficient stretching or local overstretching caused by insufficient or sudden tension.

[0031] The first drive member 311 is driven to the lower stretching roller 300b in the first stretching assembly 310, and the second drive member 321 is driven to the lower stretching roller 300b in the second stretching assembly 320.

[0032] The winding mechanism 400 includes a winding drive 410 and a winding roller 420. The winding drive 410 is mounted on the frame 100, and the winding roller 420 is connected to the drive end of the winding drive 410.

[0033] In this embodiment, the rotational speed of the winding drive 410 can be set to be the same as that of the second drive 321, so that the stretching speed of the second stretching assembly 320 matches the winding speed of the winding mechanism 400, preventing the diaphragm from becoming loose or undergoing secondary stretching in the transition section from stretching to winding.

[0034] In this embodiment, the unwinding roller 210, the stretching roller 300b in the first stretching assembly 310, the stretching roller 300b in the second stretching assembly 320, and the take-up roller 420 are arranged at intervals along the diaphragm movement direction, and the axial directions of the unwinding roller 210, the take-up roller 420, and the multiple stretching rollers 300b are arranged parallel to each other.

[0035] Please see Figures 1 to 3The lithium battery separator stretching device also includes a lifting drive mechanism 500 and two sets of lead screw transmission mechanisms 600. The stretching component is installed between the two sets of lead screw transmission mechanisms 600. Each set of lead screw transmission mechanisms 600 is connected to the output end of the lifting drive mechanism 500. Under the driving action of the lifting drive mechanism 500, the lead screw transmission mechanism 600 drives the stretching component to move in the vertical direction.

[0036] Please see Figures 1 to 3 The lifting drive mechanism 500 includes a lifting drive component 510, a worm gear 520, and two worm wheels 530. The lifting drive component 510 is mounted on the frame 100. The worm gear 520 is fixedly connected to the lifting drive component 510 and rotatably connected to the frame 100. The two worm wheels 530 are fixedly connected to the two ends of the worm gear 520 in the axial direction, respectively. The input end of each set of screw transmission mechanism 600 is fixedly connected to the worm wheel 530 on the same side.

[0037] In this embodiment, the lifting drive 510 is a handle. Rotating the handle drives the worm gear 520, which simplifies the adjustment process of the stretching angle. Of course, in some other embodiments, the lifting drive 510 can also be configured as an electric drive, which is not limited here.

[0038] This embodiment utilizes a lifting drive component 510 and a worm gear 520 to achieve synchronous transmission of two sets of lead screw transmission mechanisms 600, thereby improving the degree of synchronization.

[0039] Each set of lead screw drive mechanisms 600 includes a lead screw 610 and a mounting base 620. The lead screw 610 is fixedly connected to the worm gear 530 and threadedly connected to the mounting base 620 on the same side. The nut is located inside the mounting base 620. The two ends of the tensioning assembly along the axial direction of the tensioning roller 300b are fixedly connected to the two mounting bases 620 respectively.

[0040] This embodiment uses two sets of lead screw transmission mechanisms 600 to ensure that the two ends of the tensioning component are evenly stressed and rise or fall synchronously, avoiding tilting or jamming caused by unilateral stress and ensuring that the tensioning component maintains stable movement during angle adjustment.

[0041] Please see Figure 1 , Figure 2 and Figure 4 The lithium battery separator stretching device also includes an automatic adjustment mechanism 700. In each stretching assembly, at least one stretching roller 300b is provided with a pair of automatic adjustment mechanisms 700 at both ends of its axial direction. In this embodiment, in the two stretching assemblies, each stretching roller 300b of each stretching assembly is provided with a pair of automatic adjustment mechanisms 700.

[0042] In some other embodiments, each of the two stretching rollers 300b of each stretching assembly is provided with a pair of automatic adjustment mechanisms 700.

[0043] The automatic adjustment mechanism 700 includes a connector 710, a guide post 720, and a first elastic member 730. The stretching roller 300b connected to the stretching drive member 300a is defined as the first stretching roller 3001, and the stretching roller 300b not connected to the stretching drive member 300a is defined as the second stretching roller 3002. The frame 100 is provided with a first sliding groove 110 and a second sliding groove 120 communicating with the first sliding groove 110. The connector 710 is placed in the first sliding groove 110 and fixedly connected to the second stretching roller 3002. The guide post 720 is placed in the second sliding groove 120 and fixedly connected to the connector 710. The first elastic member 730 is supported vertically on the connector 710 and the groove wall of the first sliding groove 110.

[0044] The guide post 720 can prevent the first elastic element 730 from shifting laterally or twisting during the extension and retraction process, and ensure that the elastic force of the first elastic element 730 always acts stably on the connector 710 along the axial direction.

[0045] Under the action of the automatic adjustment mechanism 700, the clamping distance between the stretching rollers 300b in the same group is adaptively adjusted, thereby adapting to diaphragms of different thicknesses and having a wide range of applications.

[0046] The winding mechanism 400 includes a winding roller, which is mounted on the frame 100.

[0047] Please see Figure 5 and Figure 6 The lithium battery separator stretching device also includes a quick-release mechanism 800, which is mounted on the unwinding roller 210 and the frame 100, and / or the quick-release mechanism 800 is mounted on the take-up roller and the frame 100.

[0048] In some embodiments, the quick-release mechanism 800 is installed only on the unwinding roller 210 and the frame 100.

[0049] In some embodiments, the quick-release mechanism 800 is only installed on the take-up roller and the frame 100.

[0050] In some embodiments, quick-release mechanism 800 is installed on unwinding roller 210 and frame 100, and quick-release mechanism 800 is also installed on winding roller and frame 100.

[0051] In one embodiment, a quick-release mechanism 800 is disposed at one end of the unwinding mechanism 200, the other end of which is rotatably connected to the frame 100, and / or, a quick-release mechanism 800 is disposed at the end of the winding mechanism 400, the other end of which is rotatably connected to the frame 100.

[0052] The aforementioned rotatable connection can be achieved using a rotating block (not shown in the figure). For example, the rotating block can be installed on the frame 100, with one end of the unwinding roller 210 rotatably connected to the rotating block, and the other end fitted with a quick-release mechanism 800. After opening the quick-release mechanism 800, pulling the unwinding roller 210 to rotate releases one end of the unwinding roller 210, allowing for replacement of the diaphragm roll from the released end. Similarly, the winding mechanism 400 can also adopt the above connection method.

[0053] In another embodiment, two pairs of quick-release mechanisms 800 are respectively disposed at both ends of the unwinding mechanism 200, and / or, two pairs of quick-release mechanisms 800 are respectively disposed at both ends of the winding mechanism 400. Each quick-release mechanism 800 includes two sets of oppositely disposed quick-release components 810. Each set of quick-release components 810 includes a movable member 811 and a second elastic member 812. The frame 100 is provided with a slide groove 131. The movable member 811 is slidably disposed in the slide groove 131. The second elastic member 812 is supported on the groove wall of the movable member 811 and the slide groove 131. The unwinding roller 210 and / or the winding roller are provided with a snap-fit ​​groove 211 that matches the movable member 811. The number of snap-fit ​​grooves is the same as the number of movable members and corresponds one-to-one. Under the action of the second elastic member 812, the movable member 811 snaps into the snap-fit ​​groove 211.

[0054] The chute 131 is configured to provide precise guidance and limit the movement trajectory of the moving part 811.

[0055] In some embodiments, the snap-fit ​​groove 211 is an annular groove, and the upper and lower movable parts 811 are inserted into the same snap-fit ​​groove 211.

[0056] In some embodiments, the snap-fit ​​slot 211 consists of two recesses, with each movable member 811 inserted into a corresponding snap-fit ​​slot 211.

[0057] Each moving part 811 is provided with an abutment portion 8111 inclined toward the unwinding roller 210, and the outer diameter of the two abutment portions 8111 gradually decreases along the insertion direction of the unwinding roller 210. Each moving part 811 is also provided with a pulling portion 8112, which protrudes from the frame 100.

[0058] In this embodiment, the inclined surface of the abutment portion 8111 is provided to facilitate the insertion of the unwinding roller 210.

[0059] The operator pulls the two pulling parts 8112, causing the upper abutment part 8111 to move upward and the lower abutment part 8111 to move downward. The two second elastic elements 812 are compressed and deformed, releasing the unwinding roller 210. One end of the unwinding roller 210 can then be pulled out. After pulling out the unwinding roller 210, the unstretched diaphragm is placed on the unwinding roller 210. Then, the unwinding roller 210 is inserted between the abutment parts 8111. During the insertion process, the two abutment parts 8111 are subjected to force and move in opposite directions. The moving part 811 engages with the locking groove 211, and the two second elastic elements 812 recover their deformation and provide a stable clamping force to the unwinding roller 210, thereby achieving fixation.

[0060] The aforementioned pull part 8112 provides operators with a more convenient point of force application, reduces the difficulty of operation, and improves the efficiency of disassembly and assembly.

[0061] Specifically, the frame 100 includes a rotating block 130, which is provided with the aforementioned sliding groove 131, and the pulling part 8112 protrudes from the rotating block 130.

[0062] Please see Figures 1 to 3 Based on the above, this embodiment further explains the working principle of the lithium battery separator stretching device as follows: S100. After the diaphragm roll is unwound from the unwinding mechanism 200, it is stretched through two diaphragm stretching channels and then wound onto the winding mechanism 400. In the initial state, the diaphragm is stretched along the horizontal direction.

[0063] S200. Based on the different materials of the diaphragm, start the lifting drive mechanism 500, drive the screw transmission mechanism 600 to move, and drive the second set of tensioning components 320 to rise and fall, so that the second set of tensioning mechanism 300 and the first set of tensioning components 310 form a preset height difference.

[0064] S300. Start the stretching drive 300a and the winding drive 410. The diaphragm is in an inclined state between the first stretching assembly 310 and the second stretching assembly 320. The diaphragm is also in an inclined state between the second stretching assembly 320 and the winding mechanism 400.

[0065] This embodiment controls the height difference between the stretching components by controlling the vertical movement of the stretching components, thereby achieving flexible angle adjustment and guiding the molecular chains of the membrane material to arrange themselves in an orderly manner along a preset direction, avoiding local stress concentration caused by a fixed angle.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A lithium battery separator stretching device, characterized in that, The device includes a frame, an unwinding mechanism, a stretching mechanism, and a winding mechanism. The unwinding mechanism, the stretching mechanism, and the winding mechanism are sequentially mounted on the frame. The stretching mechanism includes at least two sets of stretching components. At least one set of stretching components is movable relative to the frame in a vertical direction. The movable stretching component has a vertical height difference with the other stretching components.

2. The lithium battery separator stretching device as described in claim 1, characterized in that, It also includes a lifting drive mechanism and two sets of lead screw transmission mechanisms. The tensioning assembly is installed between the two sets of lead screw transmission mechanisms. Each set of lead screw transmission mechanisms is connected to the output end of the lifting drive mechanism. Under the driving action of the lifting drive mechanism, the lead screw transmission mechanism drives the tensioning assembly to move in the vertical direction.

3. The lithium battery separator stretching device as described in claim 2, characterized in that, The lifting drive mechanism includes a lifting drive component, a worm gear, and two worm wheels. The lifting drive component is mounted on the frame. The worm gear is fixedly connected to the lifting drive component and rotatably connected to the frame. The two worm wheels are respectively connected to the two ends of the worm gear along its axial direction. The input end of each set of screw transmission mechanisms is respectively connected to the worm wheel on the same side.

4. The lithium battery separator stretching device as described in claim 3, characterized in that, Each set of lead screw transmission mechanisms includes a lead screw and a mounting base. The lead screw is fixedly connected to the worm gear on the same side, and the lead screw is threadedly connected to the mounting base on the same side. The two ends of the tensioning assembly are fixedly connected to the two mounting bases respectively.

5. The lithium battery separator stretching device according to any one of claims 1 to 4, characterized in that, Each stretching assembly includes a stretching drive and two stretching rollers. The two stretching rollers are spaced apart in the vertical direction and define a diaphragm stretching channel. At least one stretching roller is connected to the output end of the stretching drive.

6. The lithium battery separator stretching device as described in claim 5, characterized in that, It also includes an automatic adjustment mechanism. In each set of stretching components, at least one stretching roller is provided with a pair of automatic adjustment mechanisms at both ends of its axial direction. The automatic adjustment mechanism includes a connector, a guide post, and a first elastic element. The stretching roller connected to the stretching drive is defined as the first stretching roller, and the stretching roller not connected to the stretching drive is defined as the second stretching roller. The frame is provided with a first sliding groove and a second sliding groove communicating with the first sliding groove. The connector is placed in the first sliding groove and fixedly connected to the second stretching roller. The guide post is placed in the second sliding groove and fixedly connected to the connector. The first elastic element is supported vertically on the connector and the upper wall of the first sliding groove.

7. The lithium battery separator stretching device according to any one of claims 1 to 4, characterized in that, It also includes a quick-release mechanism, which is installed on the unwinding mechanism and the frame, and / or, the quick-release mechanism is installed on the winding mechanism and the frame.

8. The lithium battery separator stretching device as described in claim 7, characterized in that, One of the quick-release mechanisms is disposed at one end of the unwinding mechanism, and the other end of the unwinding mechanism is rotatably connected to the frame; and / or, one of the quick-release mechanisms is disposed at the end of the winding mechanism, and the other end of the winding mechanism is rotatably connected to the frame.

9. The lithium battery separator stretching device as described in claim 7, characterized in that, Two pairs of quick-release mechanisms are respectively disposed at both ends of the unwinding mechanism, and / or two pairs of quick-release mechanisms are respectively disposed at both ends of the winding mechanism. Each quick-release mechanism includes two sets of quick-release components arranged opposite to each other. The two sets of quick-release mechanisms are symmetrically arranged in the vertical direction, and each set of quick-release components includes a moving part and a second elastic part. The frame is provided with a slide groove. The moving part is slidably disposed in the slide groove in the vertical direction. The second elastic part is supported by the moving part and the groove wall of the slide groove. The unwinding mechanism and / or the winding mechanism are provided with a snap-fit ​​groove that matches the moving part. The number of snap-fit ​​grooves is the same as the number of moving parts and corresponds one-to-one. Under the action of the second elastic part, the moving part snaps into the snap-fit ​​groove.

10. The lithium battery separator stretching device as described in claim 9, characterized in that, Each of the moving parts is also provided with a pulling part, which protrudes from the frame.

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