Cold drawing mechanism and diaphragm production system

Abstract

The utility model provides a cold drawing mechanism and a diaphragm production system, and relates to the field of diaphragm production. The cold drawing mechanism at least comprises a first cold drawing roller, a second cold drawing roller and a second pressing roller; a cold drawing gap for a diaphragm to pass through is formed between the first cold drawing roller and the second cold drawing roller, the second cold drawing roller is located on the downstream of the first cold drawing roller in the diaphragm conveying direction, a pressing gap for the diaphragm to pass through is formed between the second pressing roller and the second cold drawing roller, and the second pressing roller applies pressure towards the interior of the second cold drawing roller to the surface of the second cold drawing roller. The cold drawing mechanism can improve the appearance quality of a diaphragm product on the basis of increasing the speed and the yield of the diaphragm.

Description

Technical Field

[0001] The present application relates to the field of diaphragm production, and more specifically, to a cold drawing mechanism and a diaphragm production system. Background Art

[0002] In the processing flow of the diaphragm lithium battery industry, when the free attached sheet processing technology increases the speed and output of the production line, the extrusion volume is increased, resulting in insufficient cooling efficiency and cooling rate of the casting sheet, causing uneven cooling of the sheet on the second cold drawing roller, thereby generating bubbles, and ultimately causing bracket-shaped spots on the surface of the finished film, which does not meet customer needs. Therefore, the line speed of special specification products in the diaphragm lithium battery industry is limited, and the extrusion volume is controlled to be less than 500kg / h.

[0003] Existing cold drawing mechanisms such as Figure 1 As shown in the figure: a first pressing roller 10, a first cold drawing roller 11 and a second cold drawing roller 12 are arranged side by side and in parallel in the X-axis direction, wherein the first pressing roller extends along the Y-axis direction (not shown in the figure), an extrusion gap 14 for the diaphragm 20 to pass through is formed between the first pressing roller 10 and the first cold drawing roller 11, a cold drawing gap 15 for the diaphragm 20 to pass through is formed between the first cold drawing roller 11 and the second cold drawing roller 12, the extrusion gap 15 is located upstream of the cold drawing gap 14 along the transmission direction of the diaphragm 20, and the second cold drawing roller 12 is located downstream of the first cold drawing roller 11 along the transmission direction of the diaphragm 20, thereby separating During the processing of the membrane 20, the membrane 20 is first adhered to the roller surface of the first cold drawing roller 11 through the extrusion gap 14, and then passes through the cold drawing gap 15 and is stretched by the speed difference between the first cold drawing roller 11 and the second cold drawing roller 12 before being adhered to the second cold drawing roller 12. At this time, the diaphragm 20 adhered to the second cold drawing roller 12 has spots. If the diaphragm 20 is subjected to subsequent hot drawing or heat setting processes, the surface of the finished film is prone to bracket-shaped spots. Moreover, as the line speed increases, the greater the extrusion amount, the more severe the spots, which has become a bottleneck for speeding up and increasing production in the field of lithium-ion battery diaphragm processing technology. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a cold drawing mechanism and a diaphragm production system, which can improve the appearance quality of the diaphragm product on the basis of increasing the speed and production of the diaphragm.

[0005] In a first aspect, an embodiment of the present application provides a cold drawing mechanism, the cold drawing mechanism comprising at least: a first cold drawing roller, a second cold drawing roller, and a second pressing roller;

[0006] A cold drawing gap for the diaphragm to pass through is formed between the first cold drawing roller and the second cold drawing roller, the second cold drawing roller is located downstream of the first cold drawing roller along the diaphragm transmission direction, a clamping gap for the diaphragm to pass through is formed between the second pressing roller and the second cold drawing roller, and the second pressing roller applies pressure on the surface of the second cold drawing roller toward the inside of the second cold drawing roller.

[0007] The cold drawing mechanism provided in the present application, through the introduction of the second pressing roller, enables the stretched diaphragm to be evenly stressed and the diaphragm temperature to be evened out after passing through the compression gap between the second pressing roller and the second cold drawing roller. This can effectively alleviate the bracket-shaped spots in the appearance defects of the diaphragm surface on the basis of improving production efficiency, thereby improving the appearance quality of the product.

[0008] In a possible implementation manner, the second pressing roller is provided with a cooling mechanism, and the cooling mechanism controls the surface temperature of the second pressing roller to be 5-8°C.

[0009] In the above implementation process, the surface temperature of the second pressing roller is controlled within the above range by the cooling mechanism, which can effectively alleviate the mildew phenomenon caused by the introduction of the second pressing roller.

[0010] In a possible embodiment, the cooling mechanism includes a cooling channel opened in the second pressing roller for passing cold water.

[0011] In the above implementation process, the surface temperature of the second pressing roller is easily controlled by providing the cooling channel.

[0012] In a possible embodiment, the second pressing roller is configured to be positionally adjustable relative to the second cold drawing roller.

[0013] In the above implementation process, the relative positions of the second pressing roller and the second cold drawing roller can meet different usage requirements and has wide applicability.

[0014] In a possible embodiment, the cold drawing mechanism includes a first translation mechanism and / or a second translation mechanism, the first translation mechanism is connected to the second pressing roller to make the second pressing roller translate in the transverse direction, and the second translation mechanism is connected to the second pressing roller to make the second pressing roller translate in the longitudinal direction.

[0015] In the above implementation process, the position of the second pressing roller is adjustable by setting the first translation mechanism and / or the second translation mechanism.

[0016] In a possible embodiment, the cold drawing mechanism includes a frame, a second translation mechanism connected to the frame, the second translation mechanism connected to the first translation mechanism so that the first translation mechanism translates longitudinally, and the first translation mechanism is transmission-connected to the second pressure roller so that the second pressure roller translates transversely.

[0017] In the above implementation process, through the above connection, the overall structure is made more compact and the second pressing roller can move in the longitudinal and transverse directions at the same time.

[0018] In a possible implementation manner, the first translation mechanism is provided with a first display element for displaying the lateral displacement of the second pressing roller.

[0019] In the above implementation process, the provision of the first display element facilitates the user to intuitively know the lateral translation data of the second pressing roller.

[0020] In a possible implementation manner, the second translation mechanism is provided with a second display element for displaying the longitudinal displacement of the second pressing roller.

[0021] In the above implementation process, the provision of the second display element facilitates the user to intuitively know the longitudinal translation data of the second pressing roller.

[0022] In a possible embodiment, the cold drawing mechanism further includes a first pressing roller, an extrusion gap for the membrane to pass through is formed between the first pressing roller and the first cold drawing roller, and the extrusion gap is located upstream of the cold drawing gap along the membrane transmission direction.

[0023] In a possible embodiment, the second pressing roller is located between the first cold drawing roller and the second cold drawing roller.

[0024] In the above implementation process, the above setting can not only completely solve the generation of bracket-type spots, but also solve the bottleneck point of speeding up and increasing production in the field of lithium-ion battery diaphragm processing technology.

[0025] In a second aspect, an embodiment of the present application provides a diaphragm production system, which includes the cold drawing mechanism provided in the first aspect of the present application, a hot drawing mechanism for hot stretching the cold drawn diaphragm, a shaping roller group for shaping the hot drawn diaphragm, and a baking device for baking the shaped diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of an existing cold drawing mechanism;

[0028] Figure 2 A schematic diagram of the structure of the cold drawing mechanism provided in the embodiment of the present application;

[0029] Figure 3 A schematic assembly diagram of the first translation mechanism and the second translation mechanism provided in an embodiment of the present application.

[0030] Icons: 1000-cold pressing mechanism; 10-first pressing roller; 11-first cold drawing roller; 12-second cold drawing roller; 13-second pressing roller; 14-extrusion gap; 15-cold drawing gap; 16-pressing gap; 17-second translation mechanism; 171-first frame; 172-first screw rod; 173-first handle; 18-first translation mechanism; 181-second frame; 182-second screw rod; 183-second handle; 184-X-axis platform; 174-first display element; 185-second display element; 20-diaphragm. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The present application provides a diaphragm production system, which includes a cold drawing mechanism, a hot drawing mechanism for hot stretching the cold-drawn diaphragm, a shaping roller group for shaping the hot-drawn diaphragm, and a baking device for baking the shaped diaphragm. The cold drawing mechanism is used to cold stretch the extruded cast sheet.

[0037] It can be understood that the horizontal direction is the X-axis direction, and the longitudinal direction is the Z-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other. The X-axis direction refers to the direction toward the center point of the first cold drawing roller with the center point of the first pressing roller as the reference point, the Y-axis direction refers to the axial direction toward the first pressing roller with the center point of the first pressing roller as the reference point, and the Z-axis direction refers to the direction perpendicular to both the X-axis direction and the Y-axis direction with the center point of the first pressing roller as the reference point. The center point of the first pressing roller refers to the midpoint of the axis of the first pressing roller.

[0038] like Figure 2 As shown, the cold pressing mechanism 1000 comprises at least: a first pressing roller 10, a first cold drawing roller 11, a second cold drawing roller 12 and a second pressing roller 13 arranged side by side and in parallel in the X-axis direction, wherein the first pressing roller 10 extends along the Y-axis direction (not shown).

[0039] Among them, an extrusion gap 14 for the diaphragm 20 to pass through is formed between the first pressing roller 10 and the first cold drawing roller 11, a cold drawing gap 15 for the diaphragm 20 to pass through is formed between the first cold drawing roller 11 and the second cold drawing roller 12, the extrusion gap 14 is located upstream of the cold drawing gap 15 along the transmission direction of the diaphragm 20, the second cold drawing roller 12 is located downstream of the first cold drawing roller 11 along the transmission direction of the diaphragm 20, a clamping gap 16 for the diaphragm 20 to pass through is formed between the second pressing roller 13 and the second cold drawing roller 12, and the second pressing roller 13 applies pressure on the surface of the second cold drawing roller 12 toward the inside of the second cold drawing roller 12.

[0040] It can be understood that there is a rotation speed difference between the first cold-drawing roller 11 and the second cold-drawing roller 12 , so that the stretching of the diaphragm 20 is achieved by utilizing the rotation speed difference between the two.

[0041] In the process of processing the diaphragm 20 by using the above-mentioned cold drawing mechanism, the diaphragm 20 first passes through the extrusion gap 14 between the first pressing roller 10 and the first cold drawing roller 11, so that the diaphragm 20 is closely attached to the surface of the first cold drawing roller 11 and enters the cold drawing gap 15 between the first cold drawing roller 11 and the second cold drawing roller 12 as the first cold drawing roller 11 rotates, and is stretched by the speed difference between the first cold drawing roller 11 and the second cold drawing roller 12. At this time, theoretically, due to the presence of the first pressing roller 10, the stretched diaphragm 20 should be closely attached to the surface of the second cold drawing roller 12 and no bubbles are generated. However, in the actual operation process, although the stretched diaphragm 20 is closely attached to the surface of the second cold drawing roller 12, there are bracket-shaped spots between the diaphragm 20 and the second cold drawing roller 12, and as the line speed increases, the larger the extrusion amount, the more serious the spots.

[0042] Therefore, the present application introduces the second pressing roller 13, so that the stretched diaphragm 20 passes through the clamping gap 16 between the second pressing roller 13 and the second cold drawing roller 12, so that the diaphragm 20 can be evenly stressed and the temperature of the diaphragm 20 can be uniformly uniformed. At this time, the diaphragm 20 is tightly fitted to the surface of the second cold drawing roller 12, which can suppress or solve the bracket-shaped spots in the appearance defects of the membrane surface of the diaphragm 20, thereby improving the appearance quality of the product. In addition, the introduction of the second pressing roller 13 can alleviate the bracket-shaped spots in the appearance defects of the membrane surface of the diaphragm 20 regardless of the processing line speed of the diaphragm 20, thereby improving the appearance quality of the product. That is, the introduction of the second pressing roller 13 can increase the speed and increase the production of the diaphragm 20 while achieving good product appearance quality.

[0043] In summary, the cold drawing mechanism provided in the present application can effectively alleviate the bracket-shaped spots in the appearance defects of the membrane surface of the diaphragm 20 on the basis of improving production efficiency through structural improvement, thereby improving the appearance quality of the product.

[0044] It should be noted that, although the bracket-shaped spots in the appearance defect of the membrane surface of the diaphragm 20 can be solved by introducing the second pressing roller 13, in actual operation, the introduction of the second pressing roller 13 causes the diaphragm 20 to have mildew spots after cold drawing using the above-mentioned cold drawing mechanism.

[0045] Therefore, in order to solve the above problem, the second pressing roller 13 is provided with a cooling mechanism (not shown), and the cooling mechanism controls the surface temperature of the second pressing roller 13 to be 5-8° C. By controlling the surface temperature of the second pressing roller 13 within the above range through the cooling mechanism, the mildew phenomenon caused by the introduction of the second pressing roller 13 can be effectively alleviated.

[0046] Exemplarily, the cooling mechanism controls the surface temperature of the second pressing roller 13 to be any value among 5° C., 6° C., 7° C., 8° C. or between any two values.

[0047] In order to facilitate the control of the surface temperature of the second pressing roller 13, the cooling mechanism includes a cooling channel (not shown) provided in the second pressing roller 13 for passing cold water. The second pressing roller 13 is water-cooled by setting the cooling channel, which is not only simple and controllable in operation, but also can effectively reduce the manufacturing cost. The surface temperature of the second pressing roller 13 can be achieved by controlling the temperature of the cold water. For example, if the heat loss is not considered, the temperature of the cold water is 5-8°C.

[0048] It is understandable that the cooling mechanism may also include a pipe and a water source for providing cold water into the cooling channel.

[0049] In order to control the uniform distribution of the surface temperature of the second pressing roller 13 after water cooling, the cooling channel may be in a circular tube shape, and the axis of the cooling channel coincides with the axis of the second pressing roller 13 .

[0050] The position of the second pressing roller 13 relative to the second cold-drawing roller 12 may remain unchanged, that is, the position of the second pressing roller 13 relative to the second cold-drawing roller 12 is configured to be non-adjustable.

[0051] In some optional embodiments, the second pressing roller 13 is configured to be adjustable relative to the second cold drawing roller 12. The relative position of the second pressing roller 13 and the second cold drawing roller 12 can meet different usage requirements and has wide applicability.

[0052] There are many ways to achieve the adjustable position of the second pressing roller 13 relative to the second cold drawing roller 12 .

[0053] In some optional embodiments, Figure 3 As shown, the cold drawing mechanism includes a first translation mechanism 18 and / or a second translation mechanism 17. The first translation mechanism 18 is connected to the second pressing roller 13 so that the second pressing roller 13 translates in the transverse direction (i.e., the X axis). The second translation mechanism 17 is in transmission connection with the second pressing roller 13 so that the second pressing roller 13 translates in the longitudinal direction (i.e., the Z axis).

[0054] The position of the second pressing roller 13 relative to the second cold drawing roller 12 can be adjusted by setting the first translation mechanism 18 and / or the second translation mechanism 17 .

[0055] Optionally, the cold drawing mechanism includes a first translation mechanism 18 and a second translation mechanism 17 .

[0056] The first translation mechanism 18 and the second translation mechanism 17 can be independently arranged and can be respectively connected to the second pressing roller 13 to achieve position adjustment.

[0057] In some optional embodiments, the cold drawing mechanism includes a frame (not shown), the second translation mechanism 17 is connected to the frame, the second translation mechanism 17 is connected to the first translation mechanism 18 so that the first translation mechanism 18 translates along the Z axis, and the first translation mechanism 18 is connected to the second pressing roller 13 so that the second pressing roller 13 translates along the X axis. Through the above connection, the structure is more compact and the second pressing roller 13 can be moved along the Z axis and the X axis at the same time.

[0058] The first translation mechanism 18 and the second translation mechanism 17 include but are not limited to screw rod structures.

[0059] For example, Figure 3 As shown, the second translation mechanism 17 includes a first frame 171, a first screw rod 172 extending along the Z axis, a first screw rod nut (not shown) matched with the first screw rod 172 and arranged on the first screw rod 172, and a Z axis platform (not shown) arranged on the first screw rod nut, wherein the first frame 171 is connected to the frame, and the first screw rod 172 is axially fixed and circumferentially rotatable on the first frame 171, so that the first screw rod nut and the Z axis platform are driven to translate along the Z axis by rotating the first screw rod 172. In order to facilitate the rotation of the first screw rod 172, a first handle 173 may be provided at one end of the first screw rod 172 extending out of the first frame 171.

[0060] The first translation mechanism 18 includes a second frame 181, a second screw rod 182 extending along the X-axis, a second screw rod nut (not shown) matched with the second screw rod 182 and arranged on the second screw rod 182, and an X-axis platform 184 arranged on the second screw rod nut, wherein the second screw rod 182 is axially fixed and circumferentially rotatable and arranged on the second frame 181, the second frame 181 is connected to the Z-axis platform, and the second pressure roller 13 is connected to the X-axis platform 184, so that the second pressure roller 13 is driven to translate along the X-axis by rotating the second screw rod 182. In order to facilitate the rotation of the second screw rod 182, a second handle 183 may be provided at one end of the second screw rod 182 extending out of the second frame 181.

[0061] In order to avoid interfering with the operation of the second pressing roller 13 during the movement, the frame includes two mounting seats located at both ends of the second pressing roller 13 in the Y-axis direction, and a fixing frame arranged on each mounting seat. The number of the first translation mechanism 18 and the second translation mechanism 17 are both two, and the two second translation mechanisms 17 are respectively installed on the corresponding fixing frames, and each first translation mechanism 18 is installed on the corresponding second translation mechanism 17. The X-axis platform 184 is connected to the end of the second pressing roller 13.

[0062] In order to obtain the translation data of the second pressing roller 13 on the X axis, the first translation mechanism 18 is provided with a first display element 174 for displaying the displacement of the second pressing roller 13 along the X axis. The first display element 174 can be arranged at one end of the first screw rod 172 extending from the first frame 171 .

[0063] In order to intuitively know the translation data of the second pressing roller 13 on the Z axis, the second translation mechanism 17 is provided with a second display element 185 for displaying the displacement of the second pressing roller 13 along the Z axis. The second display element 185 can be arranged at one end of the second screw rod 182 extending from the second frame 181 .

[0064] It should be noted that the first display element 174 and the second display element 185 can be a display screen or a display table for displaying displacement data. The first display element 174 and the second display element 185 obtain the displacement data of the second pressure roller 13 in a manner including but not limited to obtaining it by setting a displacement sensor, which will not be described in detail here, and reference can be made to the relevant technology.

[0065] It should be noted that, in the actual production process, the second pressing roller 13 can be located above or below the second cold drawing roller 12. Figure 2 As shown, the second pressing roller 13 is located between the first cold drawing roller 11 and the second cold drawing roller 12. Thus, the diaphragm 20 stretched through the cold drawing gap 15 can enter the pressing gap 16 at the first time, which can completely solve the generation of bracket-shaped spots and also solve the bottleneck point of speeding up and increasing production in the field of lithium-ion battery diaphragm 20 processing technology.

[0066] In summary, the cold drawing mechanism provided in the present application can completely solve the bracket-shaped spots in the appearance defects of the diaphragm membrane surface on the basis of improving production efficiency through structural improvement, thereby improving the appearance quality of the product.

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cold drawing mechanism, characterized in that: The cold drawing mechanism at least comprises: a first cold drawing roller, a second cold drawing roller and a second pressing roller; A cold drawing gap for the diaphragm to pass through is formed between the first cold drawing roller and the second cold drawing roller, the second cold drawing roller is located downstream of the first cold drawing roller along the diaphragm transmission direction, a pressing gap for the diaphragm to pass through is formed between the second pressing roller and the second cold drawing roller, and the second pressing roller applies pressure on the surface of the second cold drawing roller toward the inside of the second cold drawing roller.

2. The cold drawing mechanism according to claim 1, characterized in that: The second pressing roller is provided with a cooling mechanism, and the cooling mechanism controls the surface temperature of the second pressing roller to be 5-8°C.

3. The cold drawing mechanism according to claim 2, characterized in that: The cooling mechanism includes a cooling channel opened in the second pressing roller for cooling water to pass through.

4. The cold drawing mechanism according to claim 1, characterized in that: The second pressing roller is configured to be positionally adjustable relative to the second cold drawing roller.

5. The cold drawing mechanism according to claim 4, characterized in that: The cold drawing mechanism includes a first translation mechanism and / or a second translation mechanism, wherein the first translation mechanism is connected to the second pressing roller to enable the second pressing roller to translate in the transverse direction, and the second translation mechanism is connected to the second pressing roller to enable the second pressing roller to translate in the longitudinal direction.

6. The cold drawing mechanism according to claim 5, characterized in that: The cold drawing mechanism includes a frame, the second translation mechanism is connected to the frame, the second translation mechanism is connected to the first translation mechanism so that the first translation mechanism translates longitudinally, and the first translation mechanism is transmission-connected to the second pressing roller so that the second pressing roller translates transversely.

7. The cold drawing mechanism according to claim 5, characterized in that: The first translation mechanism is provided with a first display element for displaying the lateral displacement of the second pressure roller, and the second translation mechanism is provided with a second display element for displaying the longitudinal displacement of the second pressure roller.

8. The cold drawing mechanism according to claim 1, characterized in that: It also includes a first pressing roller, wherein an extrusion gap for the membrane to pass through is formed between the first pressing roller and the first cold drawing roller, and the extrusion gap is located upstream of the cold drawing gap along the membrane transmission direction.

9. The cold drawing mechanism according to claim 1, characterized in that: The second pressing roller is located between the first cold drawing roller and the second cold drawing roller.

10. A diaphragm production system, characterized in that: It comprises the cold drawing mechanism as described in any one of claims 1 to 9, a hot drawing mechanism for hot stretching the cold drawn diaphragm, a shaping roller group for shaping the hot drawn diaphragm, and a baking device for baking the shaped diaphragm.

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