Longitudinal stretching mechanism of lithium battery diaphragm

Abstract

The utility model provides a longitudinal stretching mechanism of a lithium battery diaphragm, which comprises a rack, a pretreatment section, a stretching section and a shaping section which are used for treating the lithium battery diaphragm are sequentially arranged on the rack, and a plurality of compression roller components and a plurality of oil scraping components are respectively arranged at the positions, corresponding to the pretreatment section, the stretching section and the shaping section, of the rack. With the adoption of the structure, when the lithium battery diaphragm is longitudinally stretched, under the matching of the pretreatment section, the stretching section and the shaping section, the lithium battery diaphragm is preheated in a continuous longitudinal S-shaped structure formed in the pretreatment section, is fully heated, and is stretched in a continuous transverse S-shaped structure formed in the stretching section; the lithium battery diaphragm is fully and longitudinally stretched, and then a continuous longitudinal S-shaped structure is formed through the shaping section to be fully cooled and shaped, so that the thickness uniformity of the lithium battery diaphragm is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the stretching equipment technical field of lithium battery diaphragm especially relates to a longitudinal stretching mechanism of lithium battery diaphragm. BACKGROUND

[0002] Lithium battery diaphragm refers to the diaphragm material between the positive and negative poles of the battery, which is a very key part in the battery and has a direct influence on the safety and cost of the battery. It is mainly used to isolate the positive and negative poles and make the electrons in the electrolyte pass freely between the positive and negative poles. In the production process of lithium battery diaphragm, longitudinal stretching is an important process, which usually uses a longitudinal stretching mechanism to perform the longitudinal stretching process on the lithium battery diaphragm.

[0003] At present, the longitudinal stretching mechanism generally includes a plurality of rotating stretching rollers, and the rotating speed of the stretching rollers increases from front to back along the conveying direction of the diaphragm, so that the diaphragm can be stretched along its conveying direction, that is, longitudinally stretched. However, during the stretching process by the traditional longitudinal stretching mechanism, the diaphragm is not pretreated and post-treated, which may cause uneven thickness of the diaphragm during longitudinal stretching. SUMMARY

[0004] The utility model discloses a longitudinal stretching mechanism of lithium battery diaphragm mainly solves the problem that the diaphragm is not pretreated and post-treated, which may cause uneven thickness of the diaphragm during longitudinal stretching.

[0005] To achieve the purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a longitudinal stretching mechanism of lithium battery diaphragm, including the frame, the frame is sequentially provided with the pretreatment section, the stretching section and the shaping section for processing lithium battery diaphragm, the position of the frame corresponding pretreatment section, the stretching section and the shaping section all are provided with a plurality of press roll assembly and a plurality of oil scraping component respectively;

[0007] The pretreatment section includes a feeding roller and a plurality of staggered preheating rollers, so that the lithium battery diaphragm presents a continuous longitudinal S-shaped structure when passing through the preheating rollers;

[0008] The stretching section includes a guide roller, a plurality of upper stretching rollers and a plurality of stretching assemblies, the plurality of stretching assemblies include a stretching frame, one end of the stretching frame towards the upper stretching roller is provided with a lower stretching roller, the other end is driven by a stretching cylinder, the upper stretching roller and the lower stretching roller are staggered, so that the lithium battery diaphragm presents a continuous transverse S-shaped structure when passing through the upper stretching roller and the lower stretching roller;

[0009] The shaping section comprises a plurality of cooling rollers and oil pressing rollers, and a plurality of adjacent cooling rollers and oil pressing rollers are staggered, so that the lithium battery diaphragm presents a continuous longitudinal S-shaped structure when passing through the cooling rollers and the oil pressing rollers.

[0010] In an embodiment, the shaping section further comprises a tension roller arranged between the cooling roller and the oil pressing roller, and the tension roller is driven by a tension cylinder.

[0011] In an embodiment, a pressing roller assembly is arranged on the rack corresponding to the position of at least part of the preheating roller, so that the lithium battery diaphragm passes between the preheating roller and the pressing roller assembly; an oil scraping assembly for scraping oil on the preheating roller is arranged on the rack corresponding to the position of at least part of the preheating roller; a pressing roller assembly is arranged on the rack corresponding to the position of at least part of the upper stretching roller, so that the lithium battery diaphragm passes between the upper stretching roller and the pressing roller assembly; an oil scraping assembly for scraping oil on the upper stretching roller is arranged on the rack corresponding to the position of at least part of the upper stretching roller; a pressing roller assembly is arranged on the rack corresponding to the position of at least part of the cooling roller and the oil pressing roller, so that the lithium battery diaphragm passes between the cooling roller and the pressing roller assembly, the oil pressing roller and the pressing roller assembly in sequence respectively; and an oil scraping assembly for scraping oil on the cooling roller is arranged on the rack corresponding to the position of at least part of the cooling roller.

[0012] In an embodiment, the pressing roller assembly comprises one of a first pressing roller, a second pressing roller or a third pressing roller arranged on the rack corresponding to the positions of the preheating roller, the upper stretching roller, the cooling roller and the oil pressing roller respectively.

[0013] In an embodiment, the first pressing roller comprises a straight swing frame rotatably connected to the rack, one end of the straight swing frame is rotatably connected with a first pressing roller, and the other end is rotatably connected with a first cylinder.

[0014] In an embodiment, the second pressing roller comprises a pressing roller frame mounted on the rack, a sliding frame is slidably connected to the pressing roller frame, a second pressing roller is rotatably connected to the sliding frame, and the sliding frame is driven by a second cylinder.

[0015] In an embodiment, the third pressing roller comprises a bent swing frame rotatably connected to the rack, one end of the bent swing frame is provided with a third pressing roller, and the other end is rotatably connected with a third cylinder.

[0016] In an embodiment, the oil scraping assembly comprises an oil scraping support, an oil scraping knife is arranged on the oil scraping support, and a small oil groove is arranged at the bottom of the oil scraping support.

[0017] In one embodiment, the bottom of the rack is provided with a large oil tank, the bottom of the small oil tank is provided with a small oil discharge pipe communicated with the small oil tank, the small oil discharge pipe is communicated with the large oil tank, the bottom of the large oil tank is provided with a large oil discharge pipe communicated with the large oil tank, and the large oil discharge pipe is circumscribed by an oil discharge pipeline.

[0018] The advantages or beneficial effects of the above technical solution at least include: when the lithium battery diaphragm is longitudinally stretched, the feeding roller can pull the lithium battery diaphragm into the plurality of preheating rollers through the arrangement of the feeding roller and the plurality of staggered preheating rollers, and the lithium battery diaphragm is preheated in the continuous longitudinal S-shaped structure formed by the staggered arrangement of the plurality of preheating rollers, so that the lithium battery diaphragm can be fully heated, so as to facilitate subsequent longitudinal stretching of the lithium battery diaphragm by the upper stretching roller and the stretching assembly of the stretching section, and then the lithium battery diaphragm is fully cooled and shaped in the continuous longitudinal S-shaped structure through the staggered cooling roller of the shaping section, so as to ensure the uniform thickness of the lithium battery diaphragm; at the same time, through the cooperation of the pressing roller assembly and the oil scraping assembly, the lithium battery diaphragm passing through the preheating roller, the upper stretching roller, the lower stretching roller, the cooling roller and the oil pressing roller can be prevented from slipping, so as to ensure the quality of stretching, and the oil on the surface of the lithium battery diaphragm is reduced through the cooperation of the oil pressing roller, so as to facilitate subsequent winding of the lithium battery diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application. These drawings are included herewith and constitute a part of this specification.

[0020] Figure 1 A schematic view of a longitudinal stretching mechanism according to an exemplary embodiment of the present application is shown;

[0021] Figure 2 A schematic view of a pre-treatment section according to an exemplary embodiment of the present application is shown;

[0022] Figure 3 A schematic view of a stretching section according to an exemplary embodiment of the present application is shown;

[0023] Figure 4 A schematic view of a shaping section according to an exemplary embodiment of the present application is shown;

[0024] Figure 5 A schematic view of a stretching assembly according to an exemplary embodiment of the present application is shown;

[0025] Figure 6 A schematic view of a first pressing roller assembly according to an exemplary embodiment of the present application is shown;

[0026] Figure 7 A schematic view of a second compression roller assembly according to an exemplary embodiment of the present application is shown;

[0027] Figure 8 A schematic view of a third compression roller assembly according to an exemplary embodiment of the present application is shown;

[0028] Figure 9 A schematic view of an oil scraping assembly according to an exemplary embodiment of the present application is shown.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1. frame;

[0031] 2. pretreatment section;

[0032] 21. feeding roller; 22. preheating roller;

[0033] 3. stretching section;

[0034] 31. guide roller; 32. upper stretching roller; 33. stretching assembly; 331. stretching frame; 332. lower stretching roller; 333. stretching cylinder;

[0035] 4. setting section;

[0036] 41. cooling roller; 42. oil compression roller; 43. tensioning roller; 431. tensioning cylinder;

[0037] 5. compression roller assembly;

[0038] 51. first compression roller part; 511. straight swing frame; 512. first compression roller; 513. first cylinder; 52. second compression roller part; 521. compression roller frame; 522. sliding frame; 523. second compression roller; 524. second cylinder; 53. third compression roller part; 531. bent swing frame; 532. third compression roller; 533. third cylinder;

[0039] 6. oil scraping assembly;

[0040] 61. oil scraping support; 62. oil scraping knife; 63. small oil groove; 631. small oil discharge pipe;

[0041] 7. large oil groove;

[0042] 71. large oil discharge pipe. DETAILED DESCRIPTION

[0043] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so as to more completely and thoroughly understand the present application. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0044] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0045] The term "comprising" and variations thereof as used herein are open-ended, that is "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Related definitions of other terms will be given in the following description. It should be noted that the "first", "second", etc. concepts mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0046] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative rather than limiting, and those skilled in the art should understand that unless otherwise explicitly stated in the context, it should be understood as "one or more".

[0047] The names of the messages or information exchanged between the plurality of devices in the embodiments of the present application are only for illustrative purposes, and are not used to limit the scope of these messages or information.

[0048] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the embodiments of the present application provide a longitudinal stretching mechanism for lithium battery separator, which comprises a rack 1, a pretreatment section 2 for processing lithium battery separator, a stretching section 3 and a shaping section 4 are sequentially arranged on the rack 1, a plurality of compression roller assemblies 5 and a plurality of oil scraping assemblies 6 are arranged on the rack 1 corresponding to the positions of the pretreatment section 2, the stretching section 3 and the shaping section 4 respectively;

[0049] The pre-treatment section 2 comprises a feeding roller 21 and a plurality of staggered pre-heating rollers 22, so that the lithium battery separator forms a continuous longitudinal S-shaped structure when passing through the pre-heating rollers 22; wherein the pre-heating rollers 22 can pass through a medium with heat, so as to heat the pre-heating rollers 22, and the medium can be oil; see Figure 2 Specifically, the pre-heating rollers 22 are provided with six.

[0050] The stretching section 3 comprises a guide roller 31, a plurality of upper stretching rollers 32 and a plurality of stretching assemblies 33, the stretching assemblies 33 comprise a stretching frame 331, one end of the stretching frame 331 is provided with a lower stretching roller 332 facing the upper stretching roller 32, and the other end is driven by a stretching cylinder 333, the upper stretching roller 32 and the lower stretching roller 332 are staggered, so that the lithium battery separator forms a continuous transverse S-shaped structure when passing through the upper stretching roller 32 and the lower stretching roller 332; wherein, see Figure 3 Specifically, the upper stretching rollers 32 are provided with two, and the stretching assemblies 33 are provided with two.

[0051] The setting section 4 comprises a plurality of cooling rollers 41 and oil pressing rollers 42, and the adjacent cooling rollers 41 and oil pressing rollers 42 are staggered, so that the lithium battery separator forms a continuous longitudinal S-shaped structure when passing through the cooling rollers 41 and the oil pressing rollers 42. Wherein, the cooling rollers 41 can pass through a medium with low temperature, so as to cool the cooling rollers 41, and the medium can be water; see Figure 4 Specifically, the cooling rollers 41 are provided with two.

[0052] With the above structure, when the lithium battery separator is longitudinally stretched, the feeding roller 21 can pull the lithium battery separator into the plurality of pre-heating rollers 22 through the feeding roller 21 and the plurality of staggered pre-heating rollers 22, and the lithium battery separator forms a continuous longitudinal S-shaped structure through the plurality of pre-heating rollers 22, so as to preheat the lithium battery separator, so as to fully heat the lithium battery separator for subsequent longitudinal stretching by the upper stretching rollers 32 and the stretching assemblies 33 of the stretching section 3, and then the lithium battery separator is fully cooled and set in a continuous longitudinal S-shaped structure through the staggered cooling rollers 41 of the setting section 4, so as to ensure the uniform thickness of the lithium battery separator; at the same time, through the cooperation of the pressing roller assembly 5 and the oil scraping assembly 6, the lithium battery separator passing through the pre-heating rollers 22, the upper stretching rollers 32, the lower stretching rollers 332, the cooling rollers 41 and the oil pressing rollers 42 can be prevented from slipping, so as to ensure the quality of stretching, and under the cooperation of the oil pressing rollers 42, the oil on the surface of the lithium battery separator is reduced, so as to facilitate subsequent winding of the lithium battery separator.

[0053] In one embodiment, see Figure 4The shaping section 4 further comprises a tension roller 43 arranged between the cooling roller 41 and the oil pressing roller 42, and the tension roller 43 is driven by a tension cylinder 431. In actual application, through the arrangement of the tension roller 43 and the driving of the tension cylinder 431, the tension degree of the lithium battery diaphragm during the stretching process can be adjusted, so as to adjust the proportion of the longitudinal stretching and ensure the uniformity of the thickness of the stretched lithium battery diaphragm.

[0054] In one embodiment, referring to Figure 1 , the frame 1 is provided with a pressure roller assembly 5 corresponding to the position of at least part of the preheating roller 22, so that the lithium battery diaphragm passes between the preheating roller 22 and the pressure roller assembly 5; the frame 1 is provided with an oil scraping assembly 6 corresponding to the position of at least part of the preheating roller 22, for scraping the oil on the preheating roller 22; the frame 1 is provided with a pressure roller assembly 5 corresponding to the position of at least part of the upper stretching roller 32, so that the lithium battery diaphragm passes between the upper stretching roller 32 and the pressure roller assembly 5; the frame 1 is provided with an oil scraping assembly 6 corresponding to the position of at least part of the upper stretching roller 32, for scraping the oil on the upper stretching roller 32; the frame 1 is provided with a pressure roller assembly 5 corresponding to the position of at least part of the cooling roller 41 and the oil pressing roller 42, so that the lithium battery diaphragm passes between the cooling roller 41 and the pressure roller assembly 5, and the oil pressing roller 42 and the pressure roller assembly 5 in turn, respectively; the frame 1 is provided with an oil scraping assembly 6 corresponding to the position of at least part of the cooling roller 41, for scraping the oil on the cooling roller 41. In actual application, through the position setting of the pressure roller assembly 5 and the oil scraping assembly 6, the slipping phenomenon of the lithium battery diaphragm passing through the preheating roller 22, the upper stretching roller 32, the cooling roller 41 and the oil pressing roller 42 can be prevented, so as to ensure the smooth progress of the longitudinal stretching process of the lithium battery diaphragm.

[0055] In one embodiment, referring to Figure 1 , Figure 6 , Figure 7 and Figure 8 , the pressure roller assembly 5 comprises one of a first pressure roller 51, a second pressure roller 52 or a third pressure roller 53 arranged on the frame 1 corresponding to the positions of the preheating roller 22, the upper stretching roller 32, the cooling roller 41 and the oil pressing roller 42, respectively.

[0056] The first pressure roller 51 comprises a straight swing frame 511 rotatably connected to the frame 1, one end of the straight swing frame 511 is rotatably connected with a first pressure roller 512, and the other end is rotatably connected with a first cylinder 513.

[0057] The second pressure roller 52 comprises a pressure roller frame 521 mounted on the frame 1, a sliding frame 522 is slidably connected to the pressure roller frame 521, a second pressure roller 523 is rotatably connected to the sliding frame 522, and the sliding frame 522 is driven by a second cylinder 524.

[0058] The third pressure roller piece 53 comprises a bent swing frame 531 rotatably connected to the frame 1, one end of the bent swing frame 531 is provided with a third pressure roller 532, and the other end is rotatably connected with a third air cylinder 533.

[0059] In actual application, the first pressure roller piece 51, the second pressure roller piece 52 and the third pressure roller piece 53 are arranged at the positions of the preheating roller 22, the upper stretching roller 32, the cooling roller 41 and the oil pressing roller 42, so that the occupied space of the longitudinal stretching mechanism is reduced, and the structure is more compact.

[0060] In an embodiment, referring to Figure 1 and Figure 9 The oil scraping assembly 6 comprises an oil scraping support 61, the oil scraping support 61 is provided with an oil scraping knife 62, and the bottom of the oil scraping support 61 is provided with a small oil groove 63. In actual application, the oil scraping knife 62 can scrape the oil on the preheating roller 22, the upper stretching roller 32 and the cooling roller 41, and the scraped oil can flow along the oil scraping knife 62 to the small oil groove 63 for collection.

[0061] The bottom of the frame 1 is provided with a large oil groove 7, the bottom of the small oil groove 63 is provided with a small oil discharge pipe 631 in communication with the small oil groove 63, the small oil discharge pipe 631 is in communication with the large oil groove 7, the bottom of the large oil groove 7 is provided with a large oil discharge pipe 71 in communication with the large oil groove 7, and the large oil discharge pipe 71 is externally connected with an oil discharge pipeline. In actual application, the oil in the small oil groove 63 discharged by the small oil discharge pipe 631 can be collected, and the oil in the large oil groove 7 can be discharged and treated by the externally connected oil discharge pipeline.

[0062] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a specific orientation, structure and operation, therefore it cannot be understood as a limitation on the present application.

[0063] Those skilled in the art should understand that the above embodiments are only for clearly illustrating the present application, and are not a limitation on the scope of the present application. Based on the above application, other changes or modifications can be made by those skilled in the art, and these changes or modifications are still within the scope of the present application.

Claims

1. A longitudinal stretching mechanism of a lithium battery separator, characterized by, The machine frame is provided with a pretreatment section, a stretching section and a setting section for processing lithium battery diaphragm in sequence, and a plurality of pressing roller assemblies and a plurality of oil scraping assemblies are arranged on the machine frame corresponding to the positions of the pretreatment section, the stretching section and the setting section. The pretreatment section comprises a feeding roller and a plurality of staggered preheating rollers, so that the lithium battery diaphragm forms a continuous longitudinal S-shaped structure when passing through the preheating rollers. The stretching section comprises a plurality of upper stretching rollers and a plurality of stretching assemblies, and the stretching assembly comprises a stretching frame, one end of the stretching frame is provided with a lower stretching roller, and the other end is driven by a stretching cylinder, the upper stretching roller and the lower stretching roller are staggered, so that the lithium battery diaphragm forms a continuous transverse S-shaped structure when passing through the upper stretching roller and the lower stretching roller. The setting section comprises a plurality of cooling rollers and pressing oil rollers, and a plurality of adjacent cooling rollers and pressing oil rollers are staggered, so that the lithium battery diaphragm forms a continuous longitudinal S-shaped structure when passing through the cooling rollers and the pressing oil rollers.

2. The longitudinal stretching mechanism of the lithium battery separator according to claim 1, wherein, The setting section further comprises a tensioning roller arranged between the cooling roller and the pressing oil roller, and the tensioning roller is driven by a tensioning cylinder.

3. The longitudinal stretching mechanism of the lithium battery separator according to claim 1, wherein, The machine frame is provided with a pressing roller assembly corresponding to at least part of the positions of the preheating rollers, so that the lithium battery diaphragm passes between the preheating rollers and the pressing roller assembly, and the machine frame is provided with an oil scraping assembly corresponding to at least part of the positions of the preheating rollers for scraping oil on the preheating rollers. The machine frame is provided with a pressing roller assembly corresponding to at least part of the positions of the upper stretching rollers, so that the lithium battery diaphragm passes between the upper stretching roller and the pressing roller assembly, and the machine frame is provided with an oil scraping assembly corresponding to at least part of the positions of the upper stretching rollers for scraping oil on the upper stretching roller.

4. The longitudinal stretching mechanism of the lithium battery separator according to claim 1 or 3, wherein, The machine frame is provided with a pressing roller assembly corresponding to at least part of the positions of the cooling rollers and the pressing oil rollers, so that the lithium battery diaphragm passes between the cooling roller and the pressing roller assembly and between the pressing oil roller and the pressing roller assembly in sequence, and the machine frame is provided with an oil scraping assembly corresponding to at least part of the positions of the cooling rollers for scraping oil on the cooling roller.

5. The longitudinal stretching mechanism of the lithium battery separator according to claim 4, wherein, The pressing roller assembly comprises a first pressing roller, a second pressing roller or a third pressing roller arranged on the machine frame corresponding to the positions of the preheating roller, the upper stretching roller, the cooling roller and the pressing oil roller.

6. The longitudinal stretching mechanism of the lithium battery separator according to claim 4, wherein, The first pressing roller comprises a straight swing frame rotatably connected to the machine frame, one end of the straight swing frame is rotatably connected with a first pressing roller, and the other end is rotatably connected with a first cylinder.

7. The longitudinal stretching mechanism of the lithium battery separator according to claim 4, wherein, The second pressing roller comprises a pressing roller frame mounted on the machine frame, a sliding frame is slidably connected to the pressing roller frame, a second pressing roller is rotatably connected to the sliding frame, and the sliding frame is driven by a second cylinder.

8. The longitudinal stretching mechanism of the lithium battery separator according to claim 1 or 3, wherein, The third pressing roller comprises a bent swing frame rotatably connected to the machine frame, one end of the bent swing frame is provided with a third pressing roller, and the other end is rotatably connected with a third cylinder.

9. The longitudinal stretching mechanism of the lithium battery separator according to claim 8, wherein, The oil scraping assembly comprises an oil scraping support, an oil scraping knife is arranged on the oil scraping support, and a small oil groove is arranged at the bottom of the oil scraping support. A large oil groove is arranged at the bottom of the machine frame, a small oil discharge pipe is arranged at the bottom of the small oil groove and communicates with the small oil groove, the small oil discharge pipe communicates with the large oil groove, a large oil discharge pipe is arranged at the bottom of the large oil groove and communicates with the large oil groove, and the large oil discharge pipe is connected with an oil discharge pipeline.

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