Lithium battery diaphragm production equipment and diaphragm scratching structure thereof

Abstract

The utility model provides lithium battery diaphragm production equipment and a diaphragm scratching structure thereof, and relates to the technical field of lithium battery diaphragm production, the diaphragm scratching structure comprises a supporting piece, a guiding piece and a diaphragm scratching piece, the supporting piece is arranged on one side of a stretching device, the stretching device is used for driving a composite diaphragm to move, the guiding piece is arranged on the supporting piece, and the diaphragm scratching piece is arranged on the guiding piece. The film scratching part is arranged on the guide part, the film scratching part is used for moving along the guide part so as to scratch the composite film, the composite film is provided with a plurality of groups of openings which are formed at intervals, and the length of each opening is in negative correlation with the distance of the opening deviating from the central axis of the composite film; compared with an operation mode of manual film scratching, the film scratching device has the advantages that the supporting piece, the guiding piece and the film scratching piece are matched for film scratching, the safety performance of film scratching operation is improved, and the exhaust efficiency of the composite film is improved.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery separator production, and particularly relates to a lithium battery separator production device and its film scribing structure. Background Art

[0002] The separator is one of the key inner components of a lithium battery. The separator is a porous insulating film that separates the positive and negative electrodes of the battery to prevent short circuits. The pores of the separator enable the electrolyte to transport lithium ions, and electrons are transported from the external circuit, thereby forming an electrochemical charge and discharge circuit. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, and directly affects the characteristics such as the capacity, cycle, and safety performance of the battery.

[0003] During the production process of lithium battery separators, multiple layers of films need to be laminated, pressed, and stretched. During the lamination process of multiple layers of films, a large amount of air will enter between different film layers to form air chambers. In related technologies, the method of manually scribing the film is used to remove the air between the multiple layers of films to achieve the purpose of exhausting air, but the operation method of manually scribing the film has potential safety hazards. Summary of the Utility Model

[0004] To overcome the deficiencies in the prior art, this application provides a lithium battery separator production device and its film scribing structure.

[0005] In a first aspect, this application provides a film scribing structure. The film scribing structure is used to scribe a composite film. The film scribing structure includes: a support member, a guiding member, and a film scribing member. The support member is disposed on one side of a stretching device, and the stretching device is used to drive the composite film to move. The guiding member is disposed on the support member, and the film scribing member is disposed on the guiding member. The film scribing member is used to move along the guiding member to scribe the composite film, so that the composite film has multiple groups of openings arranged at intervals, and the length of the opening is negatively correlated with the distance of the opening deviating from the central axis of the composite film.

[0006] In combination with the first aspect, in a possible implementation manner, the support member is disposed along a first preset direction, the guiding member is disposed along a second preset direction, and the second preset direction is perpendicular to the first preset direction. The stretching device is used to drive the composite film to move along a third preset direction, the third preset direction is perpendicular to the second preset direction, and the third preset direction forms a preset angle with the first preset direction.

[0007] In combination with the first aspect, in a possible implementation manner, the length of the guiding member along the second preset direction is greater than the length of the composite film along the second preset direction, and the film scribing member moves along the guiding member to a preset film scribing position of the composite film at a preset speed to scribe the film.

[0008] In combination with the first aspect, in a possible implementation, the composite film has an edge region, and the edge region includes: a first side and a second side. The first side is arranged along the third preset direction, the second side is arranged opposite to the first side, and the length of the guiding member along the second preset direction is greater than the distance between the second side and the first side.

[0009] In combination with the first aspect, in a possible implementation, there is a first preset distance between the preset film scribing position and the first side, and there is a second preset distance between adjacent two groups of the openings along the second preset direction. The first preset distance is greater than the first preset distance.

[0010] In combination with the first aspect, in a possible implementation, the opening has a preset length along the first preset direction, and the preset length is greater than or equal to the length of the film scribing member along the first preset direction.

[0011] In combination with the first aspect, in a possible implementation, there is a preset length difference between adjacent two groups of the openings along the first preset direction, and the opening includes a first end and a second end. The end face of the second end of the opening is flush with the end face of the first end of the adjacent opening.

[0012] In combination with the first aspect, in a possible implementation, the film scribing structure further includes: a rotating member. The film scribing member is connected to the rotating member, and the rotating member is configured to rotate around the center line of the film scribing member so that the film scribing member performs rotational film scribing on the composite film.

[0013] In combination with the first aspect, in a possible implementation, the film scribing structure further includes: a protective member. The protective member covers the film scribing member so that the film scribing member performs film scribing within the protective member.

[0014] In the second aspect, a lithium battery separator production device provided by the present application includes a stretching device and the above-mentioned film scribing structure.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] The scribing structure provided by this application, the scribing member moves along the guiding member to scribe the composite film, so that the composite film has multiple sets of openings arranged at intervals, and the air in the composite film can be discharged through the openings. During the composite process of each film layer, the amount of air in the middle region film layer is more than that in the edge region film layer, and the length of the opening in this application is negatively correlated with the distance of the opening deviating from the central axis of the composite film, that is, the opening size in the middle region of the composite film is larger than the opening size in the edge region of the composite film, so that openings of different sizes can be matched according to the amount of air in the composite film, accelerating the air exhaust speed of the composite film and improving the production efficiency of the composite film. Compared with the manual scribing operation method, scribing is carried out through the cooperation of the supporting member, the guiding member and the scribing member, improving the safety performance of the scribing operation and the air exhaust efficiency of the composite film. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required to be 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 therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0018] Figure 1 Shows a schematic structural diagram of a lithium battery separator production device;

[0019] Figure 2 Shows a schematic structural diagram of the scribing structure;

[0020] Figure 3 Shows a schematic structural diagram of the rotating member of the scribing structure;

[0021] Figure 4 Shows a schematic diagram of the opening on the composite film.

[0022] Main Element Symbol Description:

[0023] 100 - scribing structure; 110 - supporting member; 111 - supporting end; 112 - connecting end; 120 - guiding member; 130 - scribing member; 140 - spacer block; 150 - rotating member; 151 - motor; 152 - motor shaft; 160 - protective member; 170 - electrical cabinet; 200 - stretching device; 210 - first pressing roller; 220 - first traction roller; 230 - second traction roller; 240 - third traction roller; 250 - second pressing roller; 260 - winding roller; 300 - composite film; 310 - opening; 311 - first side; 312 - second side; 320 - first film layer; 330 - second film layer; 340 - third film layer. Detailed Embodiments

[0024] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] Embodiment 1

[0030] Please refer to Figure 1 and Figure 2 For this embodiment of the present application, a film scribing structure 100 is provided. The film scribing structure 100 is used to scribe a composite film 300. The film scribing structure 100 includes: a support member 110, a guiding member 120, and a film scribing member 130. The support member 110 is disposed on one side of a stretching device 200. The stretching device 200 is used to drive the composite film 300 to move. The guiding member 120 is disposed on the support member 110. Please refer to Figure 2 and Figure 4 For this embodiment of the present application, the film scribing member 130 is disposed on the guiding member 120. The film scribing member 130 is used to move along the guiding member 120 to scribe the composite film 300, so that the composite film 300 has a plurality of sets of openings 310 arranged at intervals. The length of the opening 310 is negatively correlated with the distance of the opening 310 deviating from the central axis of the composite film 300. During the composite process of each film layer, the air volume of the film layer in the middle region is more than that of the film layer in the edge region. In the present application, the length of the opening 310 is negatively correlated with the distance of the opening 310 deviating from the central axis of the composite film 300, that is, the size of the opening 310 in the middle region of the composite film 300 is larger than the size of the opening 310 in the edge region of the composite film 300. Therefore, different sizes of the opening 310 can be matched according to the amount of air in the composite film 300, and the air in the composite film 300 can be discharged through the opening 310, which speeds up the air exhaust speed of the composite film 300 and improves the production efficiency of the composite film 300. Compared with the manual film scribing operation method, the film scribing is performed through the cooperation of the support member 110, the guiding member 120, and the film scribing member 130, which improves the safety performance of the film scribing operation and the air exhaust efficiency of the composite film 300.

[0031] In some embodiments, the support member 110 is arranged along a first preset direction. The first preset direction is the vertical direction. There are two relatively arranged support members 110, and the support member 110 is a support rod.

[0032] Please refer to Figure 1 and Figure 2 For this embodiment of the present application, in some embodiments, the support member 110 includes: a support end 111 and a connection end 112. The support end 111 is disposed on a support surface, and a cushion block 140 is disposed on the support end 111. The cushion block 140 abuts against the support surface, and the cushion block 140 increases the support surface of the support member 110 and improves the stability of the support structure of the support member 110.

[0033] Please refer to Figure 1 and Figure 2, in some embodiments, the cushion block 140 is connected to the supporting end 111, and the cushion block 140 has a first contact surface and a second contact surface which are oppositely arranged. The supporting end 111 is connected to the first contact surface. The second contact surface abuts against the supporting surface, and an anti-slip layer is provided on the second contact surface. The anti-slip layer increases the film layer between the cushion block 140 and the supporting surface, further improving the stability of the support of the support member 110, and can provide stable structural support for the film scribing process of the film scribing member 130.

[0034] In some embodiments, the guiding member 120 is arranged between the two supporting members 110 along a second preset direction, and the guiding member 120 is connected to the connecting ends 112 of the two supporting members 110. The second preset direction is perpendicular to the first preset direction, and the second preset direction is a horizontal direction.

[0035] Please refer to Figure 1 , in some embodiments, the composite film 300 includes: a first film layer 320, a second film layer 330, and a third film layer 340. The stretching device 200 is used to laminate, press, stretch the first film layer 320, the second film layer 330, and the third film layer 340 and then wind them up.

[0036] Please refer to Figure 1 , in some embodiments, the stretching device 200 includes: a first pressing roller 210, a first traction roller 220, a second traction roller 230, a third traction roller 240, a second pressing roller 250, and a winding roller 260. The first pressing roller 210 is arranged on a side of the winding roller 260 away from the supporting member 110, and the first pressing roller 210 is used to laminate and press the separated first film layer 320, the second film layer 330, and the third film layer 340 to form the composite film 300. The first traction roller 220 is arranged between the first pressing roller 210 and the winding roller 260, and the first traction roller 220 is used to traction the composite film 300. The second traction roller 230 is arranged between the first traction roller 220 and the winding roller 260, and the second traction roller 230 is used to traction the composite film 300. The third traction roller 240 is arranged on a side of the second traction roller 230 away from the first traction roller 220. The film scribing member 130 is used to scribe the composite film 300 between the second traction roller 230 and the third traction roller 240. The second pressing roller is arranged between the third traction roller 240 and the winding roller 260, and the second pressing roller is used to extrude the scribed composite film 300 so that the air in the composite film 300 is extruded from the opening 310. The winding roller 260 is used to wind up the composite film 300.

[0037] In some embodiments, the distance between the first pressing roller 210 and the first traction roller 220 along the first preset direction is greater than the distance between the first traction roller 220 and the second traction roller 230 along the first preset direction, and the angle between the composite film 300 on the first pressing roller 210 and the first traction roller 220 and the first preset direction is less than the angle between the composite film 300 on the first traction roller 220 and the second traction roller 230 and the first preset direction.

[0038] In some embodiments, the composite film 300 between the second traction roller 230 and the third traction roller 240 is arranged along a third preset direction. The third preset direction is perpendicular to the second preset direction, and the third preset direction forms a preset angle with the first preset direction. The second traction roller 230 and the third traction roller 240 are used to drive the composite film 300 to move along the third preset direction.

[0039] In some embodiments, the guiding member 120 is a linear module. The guiding member 120 is movably connected to the film scratching member 130, and the guiding member 120 is used to drive the film scratching member 130 to slide on the guiding member 120, so that the film scratching member 130 scratches the composite film 300 on the second traction roller 230 and the third traction roller 240 along the second preset direction, and makes the composite film 300 have a plurality of sets of openings 310 arranged at intervals. The length of the guiding member 120 along the second preset direction is greater than the length of the composite film 300 on the second traction roller 230 and the third traction roller 240 along the second preset direction.

[0040] Please refer to Figure 2 and Figure 4 , in some embodiments, the composite film 300 on the second traction roller 230 and the third traction roller 240 has an edge area. The edge area includes: a first side 311 and a second side 312. The first side 311 is arranged along the third preset direction. The second side 312 is arranged opposite to the first side 311. The length of the guiding member 120 along the second preset direction is greater than the distance between the second side 312 and the first side 311 along the second preset direction.

[0041] In some embodiments, the film scratching member 130 is used to move to a preset film scratching position of the composite film 300 on the second traction roller 230 and the third traction roller 240 along the guiding member 120 at a preset speed to perform film scratching.

[0042] In some embodiments, there is a first preset distance between the preset film scribing position and the first side 311. There is a second preset distance between two adjacent groups of the openings 310 along the second preset direction. The first preset distance is greater than the second preset distance.

[0043] In some embodiments, the preset speed is 5 m / s. The first preset distance is 5 cm. The second preset distance is 2 cm.

[0044] Please refer to Figure 3 , in some embodiments, the film scribing structure 100 further includes: a rotating member 150. The film scribing member 130 is connected to the rotating member 150, and the rotating member 150 is configured to rotate around the center line of the film scribing member 130, so that the film scribing member 130 performs rotational film scribing on the composite film 300 on the second traction roller 230 and the third traction roller 240.

[0045] Please refer to Figure 3 , in some embodiments, the rotating member 150 includes: a motor 151 and a motor shaft 152. The motor 151 is disposed on the guiding member 120. The guiding member 120 is configured to drive the motor 151 to move along the guiding member 120. The motor shaft 152 is disposed on the central axis of the motor 151, and the motor shaft 152 is connected to the motor 151. The film scribing member 130 is disposed on the motor shaft 152. The motor 151 is configured to drive the motor shaft 152 to rotate, so that the film scribing member 130 rotates around the motor shaft 152.

[0046] In some embodiments, the film scribing member 130 is a film scribing blade. The number of the film scribing members 130 is three, and the three film scribing members 130 are disposed on the motor shaft 152 along the second preset direction. The middle end of the film scribing member 130 is connected to the motor shaft 152, and there is a third preset distance between two adjacent film scribing members 130.

[0047] In other embodiments, the number of the film scribing members 130 may also be four, five, six, seven, etc., which will not be enumerated one by one here.

[0048] In some embodiments, the film scribing member 130 is connected to the motor shaft 152 through a bolt connection member, so that the film scribing member 130 is detachably connected to the motor shaft 152, thereby facilitating the disassembly and assembly of the film scribing member 130 and improving the maintenance and replacement efficiency of the film scribing member 130.

[0049] In some embodiments, the opening 310 has a preset length along the first preset direction, and the preset length is greater than or equal to the length of the film scribing member 130 along the first preset direction.

[0050] In some embodiments, the length of the film-scratching member 130 along the first preset direction is 2 cm. The third preset spacing is 2 cm. The preset length is 2 cm to 10 cm.

[0051] In some embodiments, two adjacent groups of openings 310 have a fixed preset length difference along the first preset direction, and the preset length of the openings 310 at the preset film scratching position is 2 cm, and the preset length of the openings 310 on the central axis of the composite film 300 is 10 cm, that is, the length of the openings 310 in the middle area of ​​the composite film 300 along the first preset direction is greater than the length of the openings 310 in the edge area of ​​the composite film 300 along the first preset direction, and the length of the openings 310 along the first preset direction increases uniformly from the edge area of ​​the composite film 300 to the middle area of ​​the composite film 300, so that the openings 310 of different sizes can be matched according to the amount of air in the composite film 300, thereby accelerating the exhaust efficiency of the composite film 300 and improving the production efficiency of the composite film 300.

[0052] In some embodiments, the opening 310 includes a first end and a second end. The first end is located at an end of the opening 310 close to the second pulling roller 230. The second end is located at an end of the opening 310 away from the first end. The end surface of the second end of a group of the openings 310 is flush with the end surface of the first end of an adjacent group of the openings 310.

[0053] See also Figure 1 and Figure 3 In some embodiments, the film-scratching structure 100 further includes: a protective member 160. The protective member 160 is disposed on the guide member 120, and the guide member 120 is used to drive the protective member 160 to move along the guide member 120. The protective member 160 is a protective cover, and the protective member 160 has a receiving space. The protective member 160 is covered on the film-scratching member 130, so that the film-scratching member 130 can perform film-scratching in the protective member 160, and the film-scratching member 130, the motor 151 and the motor shaft 152 are all located in the receiving space. The protective member 160 can enclose and protect the film-scratching member 130, and can avoid safety accidents caused by the film-scratching member 130 falling off, thereby improving the safety of the film-scratching member 130 during the film-scratching process.

[0054] See also Figure 2, in some embodiments, an electrical cabinet 170 is provided on the support member 110. The electrical cabinet 170 is electrically connected to the motor 151, and the electrical cabinet 170 is configured to control the operation of the motor 151. The electrical cabinet 170 is connected to the guide member 120, and the electrical cabinet 170 is further configured to control the operation of the guide member 120, so as to control the movement of the film scratching member 130.

[0055] The second traction roller 230 and the third traction roller 240 drive the composite film 300 to move along the third preset direction. The electrical cabinet 170 controls the operation of the guide member 120, so that the guide member 120 drives the motor 151 to move to the film scratching position on the guide member 120. Then the electrical cabinet 170 controls the operation of the motor 151, so that the motor 151 drives the motor shaft 152 to operate, so that the film sliding member scratches the composite film 300 at the film scratching position and generates the opening 310. After the film scratching at the film scratching position is completed, the motor 151 moves to the next position along the guide member 120 for film scratching, and the residence time of the motor 151 at two adjacent positions is different, so that the length of the opening 310 along the first preset direction increases uniformly from the edge area of the composite film 300 to the middle area of the composite film 300, that is, the opening 310 of different sizes can be matched according to the amount of air in the composite film 300, which speeds up the exhaust efficiency of the composite film 300, thereby improving the production efficiency of the composite film 300. Compared with the manual film scratching operation mode, the film scratching structure 100 in the present application improves the safety of the film scratching operation through the cooperation of the support member 110, the guide member 120, the film scratching member 130 and the protection member 160.

[0056] Embodiment Two

[0057] Please refer to Figures 1 to 4 , the embodiment of the present application provides a lithium battery separator production device, including a stretching device 200 and the film scratching structure 100 in any one of the above embodiments, so it has all the beneficial effects of the film scratching structure 100 in any one of the above embodiments, which will not be elaborated here one by one.

[0058] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A film-cutting structure, which is used to cut a composite film, characterized in that: include: A support member, wherein the support member is arranged on one side of the stretching device, and the stretching device is used to drive the composite film to move; A guide member, wherein the guide member is arranged on the support member; A film-scratching member is arranged on the guide member, and is used to move along the guide member to cut the composite film, and make the composite film have a plurality of groups of openings arranged at intervals, and the length of the opening is negatively correlated with the distance that the opening deviates from the central axis of the composite film.

2. The film-cutting structure according to claim 1, characterized in that: The support member is arranged along a first preset direction, the guide member is arranged along a second preset direction, and the second preset direction is perpendicular to the first preset direction, and the stretching device is used to drive the composite film to move along a third preset direction, the third preset direction is perpendicular to the second preset direction, and the third preset direction is at a preset angle to the first preset direction.

3. The film-cutting structure according to claim 2, characterized in that: The length of the guide member along the second preset direction is greater than the length of the composite film along the second preset direction, and the film-scratching member moves along the guide member at a preset speed to a preset film-scratching position of the composite film for film-scratching.

4. The film-cutting structure according to claim 3, characterized in that: The composite film has an edge region, and the edge region includes: a first edge, the first edge being arranged along the third preset direction; The second side is arranged opposite to the first side, and the length of the guide member along the second preset direction is greater than the distance between the second side and the first side.

5. The film-cutting structure according to claim 4, characterized in that: There is a first preset distance between the preset film-scratching position and the first side, and there is a second preset distance between two adjacent groups of openings along the second preset direction, and the first preset distance is greater than the first preset distance.

6. The film-cutting structure according to any one of claims 2 to 5, characterized in that: The opening has a preset length along the first preset direction, and the preset length is greater than or equal to a length of the film-scraping member along the first preset direction.

7. The film-cutting structure according to any one of claims 2 to 5, characterized in that: Two adjacent groups of openings have a preset length difference along the first preset direction, and the openings include a first end and a second end, and an end surface of the second end of the opening is flush with an end surface of the first end of the adjacent opening.

8. The film-cutting structure according to any one of claims 1 to 5, characterized in that: The film-cutting structure also includes: The film-scraping member is connected to the rotating member, and the rotating member is used to rotate around the center line of the film-scraping member so that the film-scraping member can rotate and scrub the composite film.

9. The film-cutting structure according to any one of claims 1 to 5, characterized in that: The film-cutting structure also includes: A protective member is provided on the film-scratching member so that the film-scratching member can perform film-scratching in the protective member.

10. A lithium battery separator production device, characterized in that: It comprises a stretching device and the film-cutting structure described in any one of claims 1-9.

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