Diaphragm auxiliary cutting device

Abstract

The utility model relates to the technical field of lithium battery production, and particularly discloses an auxiliary diaphragm cutting device which comprises a first driving assembly, a suction plate and a cutting assembly used for cutting a diaphragm, the cutting assembly comprises a cutter, and the suction plate is arranged on one side of the cutter; a plurality of vacuum cavities are formed in the suction plate, the vacuum cavities are arranged at intervals, a plurality of air suction holes used for adsorbing pole pieces are formed in the face, right facing the cutter, of the suction plate, and the air suction holes are communicated with the vacuum cavities so that negative pressure can be formed in the face, right facing the cutter, of the suction plate; the first driving assembly is in driving connection with the cutting assembly to drive the cutter to move so as to cut the diaphragm; according to the utility model, tension can be provided for the negative pole piece, and the pleating phenomenon of the pole piece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and more specifically, to a diaphragm auxiliary cutting device. Background Art

[0002] In the lithium battery cell winding process, an automatic winding machine is required. During use, the positive and negative electrode sheets and the diaphragm need to be placed into the winding mechanism of the winding machine through the positive and negative electrode sheet feeding devices and the diaphragm feeding device respectively for winding. After the positive and negative electrode strips and the diaphragm are wound a certain length at the winding needle station of the winding mechanism, the electrode cutting device first cuts the positive and negative electrode sheets, and then the diaphragm auxiliary cutting device cuts the diaphragm.

[0003] In the existing cell winding process, because the tail length of the negative electrode sheet is too long and there is no force, it is easy to wrinkle, resulting in unstable problems during the tail sticking process. Summary of the Utility Model

[0004] The utility model provides a diaphragm auxiliary cutting device to solve the problems existing in the above background art.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a diaphragm auxiliary cutting device for cutting a diaphragm, including a first driving component, a suction plate, and a cutting component for cutting the diaphragm. The cutting component includes a cutting knife. The suction plate is arranged on one side of the cutting knife and is arranged at an acute angle with the cutting knife. A plurality of vacuum cavities are arranged in the suction plate, and the plurality of vacuum cavities are arranged at intervals. A plurality of suction holes for adsorbing the electrode sheet are arranged on the surface of the suction plate facing the cutting knife, and the suction holes are communicated with the vacuum cavities to form a negative pressure at the surface of the suction plate facing the cutting knife. The first driving component is drivingly connected to the cutting component to drive the cutting knife to move, thereby cutting the diaphragm.

[0006] In some embodiments of the present application, the plurality of vacuum cavities include a first cavity, and the first cavity is in a "one" shape; the suction holes are evenly arranged at intervals along the first cavity.

[0007] In some embodiments of the present application, the plurality of vacuum cavities include a second cavity, and the second cavity is in a "rich" shape; the suction holes are evenly arranged at intervals along the second cavity.

[0008] In some embodiments of the present application, the plurality of cavities include at least one first cavity and at least two second cavities; the first cavity is in a "one" shape, and the suction holes are evenly arranged at intervals along the first cavity; the second cavity is in a "rich" shape, and the suction holes are evenly arranged at intervals along the second cavity; the first cavity is arranged between the two second cavities.

[0009] In some embodiments of the present application, a distance between two adjacent air suction holes communicated with the first cavity is smaller than a distance between two adjacent air suction holes communicated with the second cavity.

[0010] In some embodiments of the present application, the angle between a surface of the suction plate facing the cutter and the horizontal direction is 10 to 60 degrees.

[0011] In some embodiments of the present application, a plurality of the suction holes are provided at one end of the suction plate close to the cutter.

[0012] In some embodiments of the present application, the first driving assembly includes a first driving member and a guide member, the cutting assembly is movably connected to the guide member, and the first driving member drives the cutting assembly to move along the direction of the guide member to cut the diaphragm.

[0013] In some embodiments of the present application, the cutting assembly also includes a first pressure roller for fixing the diaphragm and a second pressure roller for preventing the diaphragm from folding, the first pressure roller is arranged on the side of the cutter facing away from the suction plate, and the second pressure roller is arranged on the side of the cutter facing the suction plate.

[0014] In some embodiments of the present application, the cutting assembly further includes a second driving member and a third driving member, the second driving member is drivingly connected to the first pressure roller, and the third driving member is drivingly connected to the second pressure roller.

[0015] Compared with the prior art, the utility model can increase the adsorption effect on the negative electrode of the electrode sheet by changing the support plate of the diaphragm auxiliary cutting device in the prior art into a suction plate, so that it can be placed on the suction plate more easily. Among them, a vacuum chamber and suction holes corresponding to the vacuum chamber are provided to enhance the adsorption effect, make the adsorption process more stable, provide tension for the negative electrode sheet, and reduce the phenomenon of wrinkling of the electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the diaphragm auxiliary cutting device in an embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of the structure of the diaphragm auxiliary cutting device in an embodiment of the present application.

[0018] Figure 3 A top view of the suction plate in an embodiment of the present application.

[0019] Figure 4 This is the initial working diagram of the diaphragm auxiliary cutting device and the winding device in the embodiment of the present application.

[0020] Figure 5It is a schematic diagram of the structure in which the negative electrode sheet of the winding device falls into the suction plate in an embodiment of the present application.

[0021] Figure 6 It is a structural schematic diagram of the diaphragm cutting device in the embodiment of the present application.

[0022] Description of reference numerals:

[0023] 1-first driving component; 101-guide member; 102-first driving member;

[0024] 2-suction plate; 210-vacuum chamber; 211-first cavity; 212-second cavity; 220-suction hole;

[0025] 3-cutting assembly; 301-cutter; 302-first pressing roller; 303-second pressing roller; 304-second driving member; 305-third driving member;

[0026] 4-diaphragm; 5-negative electrode plate. DETAILED DESCRIPTION

[0027] Example 1

[0028] This embodiment provides a diaphragm auxiliary cutting device, such as Figure 1-3 As shown, a diaphragm auxiliary cutting device includes a first driving component 1, a suction plate 2 and a cutting component 3 for cutting the diaphragm, the cutting component 3 includes a cutter 301, the suction plate 2 is arranged on one side of the cutter 301, and is arranged at an acute angle with the cutter; a plurality of vacuum chambers 210 are arranged in the suction plate 2, and the plurality of vacuum chambers 210 are arranged at intervals, and a plurality of suction holes 220 for adsorbing the electrode sheet are opened on the side of the suction plate 2 facing the cutter 301, and the suction holes 220 are connected with the vacuum chamber 210 to form a negative pressure on the side of the suction plate 2 facing the cutter 301; the first driving component 1 is connected to the cutting component 3 to drive the cutter 301 to move, and then cut the diaphragm. Among them, the first driving component 1 is used to drive the cutting component 3 to cut the diaphragm, and the suction plate 2 is used to adsorb the negative electrode sheet.

[0029] In some embodiments, the number of vacuum chambers 210 in the suction plate 2 is three. The three vacuum chambers 210 are arranged at intervals in the suction plate 2, independent of each other and not connected to each other, which can ensure the stability of adsorption. Among them, an air suction port corresponding to the three vacuum chambers 210 is opened on one side wall of the suction plate 2. The suction pipe of the external suction device is connected to the suction plate 2 through three air inlet ports to suck air into the suction plate 2. Preferably, the size of the air suction port is G1 / 8. The application of a large-diameter joint ensures a large suction force during vacuum suction, thereby ensuring the stability of the tension when the negative electrode plate is adsorbed. On the side of the suction plate 2 facing the cutting knife 301, there are air suction holes 220. The air suction holes 220 are communicated with the vacuum chamber 210 to make the suction plate 2 generate suction force, ensuring that the suction plate 2 can adsorb the negative electrode plate. During use, the suction plate 2 is turned on, the winding needle station is flipped, and the innermost electrode plate falls on the suction plate 2 after being reversed and is adsorbed by the suction plate 2. Subsequently, the first driving assembly 1 drives the cutting assembly 3 to cut the diaphragm. After cutting the diaphragm, the winding needle station continues to flip, winds the last negative electrode plate, and completes the finishing work.

[0030] In this embodiment, by changing the existing support plate to the suction plate 2, the adsorption effect on the negative electrode of the electrode plate can be increased, making it easier to place on the suction plate 2. Among them, setting a plurality of vacuum chambers 210 and air suction holes 220 corresponding to the plurality of vacuum chambers 210 can enhance the adsorption effect, make the adsorption process more stable, provide tension for the negative electrode plate, and reduce the phenomenon of the electrode plate wrinkling.

[0031] In one embodiment, the suction plate 2 may include a first cavity 211. The first cavity 211 is in a "one" shape, and a plurality of air suction holes 220 are arranged along the extending direction of the first cavity 211. In another embodiment, the suction plate 2 may include a second cavity 212. The second cavity 212 is in a "rich" shape, and a plurality of air suction holes 220 are arranged along the extending direction of the second cavity 211. By selecting different cavity shapes in the suction plate 2, the suction force of the suction plate 2 on the negative electrode plate can be adjusted. Of course, the shape and number of the vacuum chambers of the suction plate 2 can be determined according to the actual situation, and the present application does not limit this.

[0032] Preferably, the angle between the side of the suction plate 2 facing the cutting knife 301 and the horizontal direction is 10 to 60 degrees. 10 to 60 degrees can make the negative electrode plate more likely to fall onto the support plate. Through a large number of experiments, it is proved that the more preferable angles for the side of the suction plate 2 facing the cutting knife 301 and the horizontal direction are 25 degrees, 30 degrees, and 35 degrees. This angle can increase the stability of the adhesive application of the finishing tape and save the structural space of the auxiliary cutting device. Further, the air suction holes 220 are arranged at one end of the suction plate 2 close to the cutting knife 301. Arranging the air suction holes 220 at one end of the cutting knife 301 can better adsorb the negative electrode plate and prevent it from wrinkling.

[0033] In some embodiments, the first drive assembly 1 includes a first drive member 102 and a guide member 101, the cutting assembly 3 is movably connected to the guide member 101, and the first drive member 102 drives the cutting assembly 3 to move along the direction of the guide member 101 to cut the diaphragm. Specifically, the first drive assembly 1 also includes a movable plate, and the cutting assembly 3 is arranged on one end of the movable plate near the needle rolling station. The first drive member 102 is a drive motor, and the guide member 101 is a guide rail. The movable plate is movably connected to the guide rail. A connecting groove is arranged on the movable plate. A rotating member is connected to the driving end of the drive motor. The rotating member is circular, and a connecting block is arranged on the rotating member. The connecting groove is movably connected to the connecting block. The drive motor drives the rotating member to rotate, thereby driving the movable member to move along the guide rail, and driving the cutter 301 on the cutting assembly 3 to cut the diaphragm. It can be understood that the first drive assembly 1 is not limited to the above-mentioned method. It can also be a cylinder, a screw rod, etc., and it only needs to drive the cutting assembly 3 to move. This embodiment does not make specific limitations.

[0034] Specifically, the cutting assembly 3 also includes a first pressure roller 302 and a second pressure roller 303. The first pressure roller 302 is arranged on the side of the cutter 301 facing away from the suction plate 2, and the second pressure roller 303 is arranged on the side of the cutter 301 facing the suction plate 2. Among them, the first pressure roller 302 is fixed on one side of the upper diaphragm, making cutting more convenient, and the second pressure roller 303 is close to the side of the lower diaphragm (i.e., the diaphragm after cutting). There is a gap between the second pressure roller 303 and the lower diaphragm to prevent the lower diaphragm from folding during the winding process after the diaphragm is cut. The first pressure roller 302 is arranged above the cutter 301, and the second pressure roller 303 is arranged below the cutter 301. During the working process, the first driving assembly 1 drives the cutting assembly 3 to move toward the diaphragm. At this time, the first pressure roller 302 fixes the upper diaphragm, and there is a gap between the second pressure roller 303 and the lower diaphragm to assist the winding of the lower diaphragm, and the cutter 301 cuts the diaphragm.

[0035] Furthermore, the cutting assembly 3 further includes a second driving member 304 and a third driving member 305, wherein the second driving member 304 is drivingly connected to the first pressing roller 302, and the third driving member 305 is drivingly connected to the second pressing roller 303. The second driving member 304 can independently drive the first pressing roller 302 to move, and the first pressing roller 302 fixes the upper diaphragm, so that the cutting effect is better; the third driving member 305 can independently drive the second pressing roller 303 to move, and assist the winding of the lower diaphragm; wherein the second driving member 304 is a driving cylinder, and the third driving member 305 is a driving cylinder, and the first pressing roller 302 and the second pressing roller 303 are moved by the extension and contraction of the driving cylinder, and are independently controlled, so that the control of the first pressing roller 302 and the second pressing roller 303 is more precise, and the winding effect is better.

[0036] Since the tail length of the negative electrode tab is the longest among the four strips (i.e., two separators, the positive electrode tab, and the negative electrode tab) during the process of wrapping the battery cell with the negative electrode, it is necessary to wrap the two separators and the positive electrode strip with the negative electrode tab before applying the tail glue. During use, please refer to Figure 4 and place the diaphragm auxiliary cutting device on one side of the winding needle station. Turn on the suction plate 2 to generate a vacuum suction force. Please refer to Figure 5 . After the electrode tab cutter cuts the electrode tab, the winding needle station rotates. The innermost negative electrode tab 5 is naturally thrown onto the suction plate 2 after rotation. The suction plate 2 sucks the negative electrode of the electrode tab, applying tension to the negative electrode tab 5. At this time, please refer to Figure 6 . Turn on the drive motor 102. The drive motor 102 drives the cutting assembly 3 to move to a predetermined position at the winding station. The drive cylinders drive the first pressure roller 302 to fix the upper side of the separator 4 respectively, and drive the second pressure roller 303 to assist in winding the lower side of the separator 4. The drive motor 102 continues to drive, causing the cutter 301 to cut the separator 4, and the winding needle station continues to rotate to complete the winding of the negative electrode tab.

[0037] Example 2

[0038] Combined with Figure 3 , Example 2 is similar to Example 1. The difference is that several of the vacuum chambers 210 include a first chamber 211, and the first chamber 211 is in the shape of a "one". The suction holes 220 are evenly spaced along the first chamber 211. The inside of the suction plate 2 is composed of several first chambers 211. Specifically, the first chamber 211 can be at least two. A number of suction holes are densely arranged and communicated with the first chamber 211. By setting multiple first chambers 211, the suction force of the suction plate 2 can be enhanced, the tension of the negative electrode tab is more stable, and it is easier to process. Optionally, the first chamber 211 is 3, 4, or 5. The actual number of the first chambers is not limited.

[0039] Example 3

[0040] Combined with Figure 3 , Example 3 is similar to Example 1. The difference is that several of the vacuum chambers 210 include a second chamber 212, and the second chamber 212 is in the shape of a "feng". The suction holes 220 are evenly spaced along the second chamber 212. The inside of the suction plate 2 is composed of several second chambers 212. Specifically, the second chamber 212 is at least two. The second chamber 212 has a main body in the shape of a "one", and multiple struts perpendicular to the main body. A number of suction holes 220 are arranged on the struts of the second chamber 212, which can make the adsorption area larger and prevent the electrode tab from wrinkling.

[0041] Example 4

[0042] In some embodiments, please refer to Figure 3 , a plurality of cavities include at least one first cavity 211 and at least two second cavities 212; the first cavity 211 is in a "one" shape, and the suction holes 220 are arranged at uniform intervals along the first cavity 211; the second cavity 212 is in a "rich" shape, and the suction holes 220 are arranged at uniform intervals along the second cavity 212; the first cavity 211 is arranged between two second cavities 212. Among them, one first cavity 211 is selected, two second cavities 212 are selected, the first cavity 211 has only one main trunk, in a "one" shape, and the second cavity 212 includes one main trunk and several branches, in a "rich" shape. Preferably, the length and width of the main trunk of the first cavity 211 are the same as those of the main trunk of the second cavity 212. In this embodiment, the second cavity 212 includes five branches, and the five branches are arranged at uniform intervals at one end of the suction plate 2 close to the cutter 301.

[0043] Specifically, the first cavity 211 is arranged between two second cavities 212. A plurality of air holes are opened on the first cavity 211 and the two second cavities 212. Among them, the suction holes 220 are arranged at uniform intervals on the first cavity 211, and the same number of suction holes 220 are respectively arranged at uniform intervals on the second cavity 212. The second cavity 212 can provide a large suction area, while ensuring the balance at both ends of the suction plate 2 and preventing the pole piece from wrinkling. The suction holes 220 of the first cavity 211 are designed more densely, which can ensure the concentration of the suction force in the middle and stably provide the tension during gluing. At the same time, only the suction holes 220 penetrate through the overall cavity, reducing the volume inside the cavity, improving the efficiency of vacuum adsorption, and increasing the strength of the suction plate 2.

[0044] Preferably, the distance between two adjacent suction holes 220 communicated with the first cavity 211 is smaller than the distance between two adjacent suction holes 220 communicated with the second cavity 212. The smaller distance between the two suction holes 220 of the first cavity 211 compared to the distance between the two suction holes 220 of the second cavity 212 helps the suction force of the first cavity 211 to be more concentrated and the suction force of the second cavity 212 to be more dispersed, while ensuring a large tension for the pole piece and better preventing the pole piece from wrinkling.

[0045] The drawings are only for illustrative purposes and should not be construed as a limitation of this patent; for a better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0046] The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention 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. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary explanations and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0047] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, the specific relationship represented can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0048] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A diaphragm auxiliary cutting device for cutting diaphragms, characterized in that: It includes a first driving component, a suction plate, and a cutting component for cutting a diaphragm. The cutting component includes a cutter. The suction plate is arranged on one side of the cutter and is set at an acute angle with the cutter. A number of vacuum chambers are provided in the suction plate. The number of the vacuum chambers are arranged at intervals. A number of suction holes for adsorbing the pole piece are formed on the surface of the suction plate facing the cutter. The suction holes are communicated with the vacuum chambers to form a negative pressure at the surface of the suction plate facing the cutter. The first driving component is drivingly connected to the cutting component to drive the cutter to move, thereby cutting the diaphragm.

2. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The number of the vacuum chambers includes a first cavity, and the first cavity is in a "one" shape. The suction holes are evenly arranged at intervals along the first cavity.

3. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The number of the vacuum chambers includes a second cavity, and the second cavity is in a "rich" shape. The suction holes are evenly arranged at intervals along the second cavity.

4. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The number of the vacuum chambers includes at least one first cavity and at least two second cavities. The first cavity is in a "one" shape, and the suction holes are evenly arranged at intervals along the first cavity. The second cavity is in a "rich" shape, and the suction holes are evenly arranged at intervals along the second cavity. The first cavity is arranged between the two second cavities.

5. The diaphragm auxiliary cutting device according to claim 4, characterized in that: The distance between two adjacent suction holes communicated with the first cavity is less than the distance between two adjacent suction holes communicated with the second cavity.

6. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The angle between the surface of the suction plate facing the cutter and the horizontal direction is 10 to 60 degrees.

7. The diaphragm auxiliary cutting device according to claim 1, characterized in that: A number of the suction holes are arranged at one end of the suction plate close to the cutter.

8. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The first driving component includes a first driving member and a guiding member. The cutting component is movably connected to the guiding member. The first driving member drives the cutting component to move along the direction of the guiding member to cut the diaphragm.

9. The diaphragm auxiliary cutting device according to claim 1, characterized in that: The cutting component further includes a first pressing roller for fixing the diaphragm and a second pressing roller for preventing the diaphragm from folding. The first pressing roller is arranged on the side of the cutter facing away from the suction plate, and the second pressing roller is arranged on the side of the cutter facing the suction plate.

10. The diaphragm auxiliary cutting device according to claim 9, characterized in that: The cutting component further includes a second driving member and a third driving member. The second driving member is drivingly connected to the first pressing roller, and the third driving member is drivingly connected to the second pressing roller.

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