Diaphragm winding mechanism

Abstract

The utility model discloses a diaphragm winding mechanism which comprises a frame body, an unwinding position and a tension control mechanism, the unwinding position is assembled on the frame body; the tension control mechanism is assembled on the frame body and comprises a swing roller assembly, a main driving assembly and a winding position, and the swing roller assembly, the main driving assembly and the winding position are all connected with the frame body; the main driving assembly is arranged between the swing roller assembly and the winding position in the line direction of diaphragm tape conveying, and the main driving assembly is connected with a diaphragm; the main driving assembly divides the winding line into a first section and a second section, the swing roller assembly is arranged on the first section, and the winding position is arranged on the second section. The diaphragm is connected with the swing roller assembly and wound around the winding position. The main driving assembly divides the winding line into the first section and the second section of which the tension can be independently controlled, and after separation, the diaphragm between the winding position and the main driving assembly can realize smaller tension, so that the diaphragm can be prevented from shrinking inwards to extrude a pole piece after winding is finished and a needle is drawn, and the pole piece is prevented from being wrinkled.

Description

Technical Field

[0001] The utility model relates to the technical field of electric core processing equipment, in particular to a diaphragm winding mechanism. Background Art

[0002] With the update and iteration of the battery cell processing and manufacturing industry, battery cell safety is put first. The battery cell winding process applies a certain tension to the diaphragm to ensure the neatness between the positive electrode sheet, diaphragm, and negative electrode sheet. However, the tension in the process will cause the diaphragm to be stretched in the direction of the tape. The shrinkage of the diaphragm in the direction of the tape is very large, which will cause the diaphragm to severely squeeze the electrode sheet, causing the electrode sheet to be S-shaped or wrinkled, thereby causing the battery cell to deform after winding. The deformed battery cell not only has poor appearance flatness, but also has defects such as diaphragm wrinkles inside. The wrinkles in the electrode coating area will cause the surface of the bare battery cell to be uneven, and the stress concentration may cause the diaphragm to break, causing the battery cell to micro-short or short circuit, which will lead to quality problems such as low capacity, poor cycle performance and fast self-discharge, especially for thicker wound batteries. The deformation problem after winding is particularly prominent. In addition, the thickness consistency of the loose battery cell is also poor, which will affect the battery cell shelling process, increase the difficulty of the shelling process, and even cause damage to the battery cell during shelling. Therefore, winding tension control is very important. Utility Model Content

[0003] In order to solve at least one problem existing in the prior art, the utility model provides a diaphragm winding mechanism including a frame, an unwinding position and a tension control mechanism;

[0004] The unwinding position is mounted on the frame;

[0005] The tension control mechanism is assembled on the frame, and the tension control mechanism includes a swing roller assembly, a main drive assembly and a winding position, and the swing roller assembly, the main drive assembly and the winding position are all connected to the frame; along the line direction of the diaphragm tape, the main drive assembly is arranged between the swing roller assembly and the winding position, and the main drive assembly is connected to the diaphragm; the main drive assembly divides the winding line into a first section and a second section, the swing roller assembly is arranged in the first section, and the winding position is arranged in the second section; the diaphragm is connected to the swing roller assembly, the diaphragm is wound on the winding position, and the winding position controls the diaphragm tension by actively rotating.

[0006] In some embodiments, the main drive assembly includes a first shaft and a second shaft, the first shaft is connected to the frame, the second shaft is connected to the first shaft, and the diaphragm is clamped between the first shaft and the second shaft.

[0007] In some embodiments, the main drive assembly further includes a first motor, and the first motor is connected to the first shaft; and / or the first motor is connected to the second shaft; the first shaft and the second shaft are pressed tightly together.

[0008] In some embodiments, the main driving assembly further includes an outer frame and a moving member, wherein the moving member is connected to the second shaft and the outer frame respectively, and the moving member can move in a radial direction of the first shaft.

[0009] In some embodiments, the swing roller assembly includes a second motor, a guide shaft and a connecting member, the second motor is fixed to the frame, the guide shaft is connected to the connecting member, the connecting member is connected to the rotating shaft of the second motor, and the axis of the rotating shaft is parallel to the axis of the guide shaft but not on the same straight line;

[0010] The diaphragm is in contact with the guide shaft.

[0011] In some embodiments, the guide shaft includes a first guide shaft and a second guide shaft, the first guide shaft and the second guide shaft are connected to the same side of the connecting member, the diaphragm passes between the first guide shaft and the second guide shaft, and the two side surfaces of the diaphragm are respectively pressed tightly against the first guide shaft and the second guide shaft.

[0012] In some embodiments, the winding position includes a third motor and a winding shaft, the third motor is fixed on the frame, the winding shaft is connected to the rotating shaft of the third motor, and the third motor can control the winding tension.

[0013] In some embodiments, the diaphragm winding mechanism also includes a roller assembly, which is connected to the frame; the roller assembly includes a first roller, which is connected to the frame; in the direction of gravity, the axial position of the first roller is higher than the axial position of the unwinding position, and the diaphragm is pressed tightly against the top of the first roller.

[0014] In some embodiments, the roller assembly further includes a second roller, the second roller being connected to the frame and arranged between the first roller and the swing roller assembly along the membrane running direction;

[0015] The second roller is composed of a plurality of rollers, and the plurality of rollers are pressed and fitted tightly against one of the two side surfaces of the diaphragm.

[0016] In some embodiments, the roller assembly further includes a third roller, which is connected to the frame. In the direction of gravity, the axis of the third roller is higher than the axis of the winding position, and the third roller is pressed tightly against the diaphragm.

[0017] Compared with the prior art, the diaphragm winding mechanism provided by the utility model has the following beneficial effects: the diaphragm winding mechanism provided by the utility model adds a main driving structure in the tension control mechanism of the diaphragm tape walking process, and the main driving structure divides the winding circuit into a first section and a second section, so that the tension of the diaphragm tape walking can be controlled in sections, the diaphragm unwinding position to the main driving component is the first section, and the main driving component to the winding position is the second section; in the first section, the tension of the diaphragm is balanced and neutralized by the swing roller assembly, and in the second section, the main driving component drives the diaphragm to move through its active and stable rotation and cooperates with the rotation of the winding position, so that the tension from the winding position to the main driving end can achieve a smaller tension, which can prevent the diaphragm from shrinking and squeezing the pole piece after the needle is pulled out at the end of winding, causing the pole piece to wrinkle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the planar structure of an embodiment provided by the present application;

[0019] Figure 2 It is a structural schematic diagram of the main drive assembly provided by the present application;

[0020] Figure 3 It is a structural schematic diagram of the swing roller assembly provided in this application.

[0021] 100, tension control mechanism; 11, swing roller assembly; 111, second motor; 112, guide shaft; 1121, first guide shaft; 1122, second guide shaft; 113, connecting piece; 12, main drive assembly; 121, first motor; 122, first shaft; 123, second shaft; 124, outer frame; 125, moving piece; 13, winding position; 200, unwinding position; 300, roller assembly; 31, first roller; 32, second roller; 33, third roller; 400, frame. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0023] 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.

[0024] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", 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 utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] A diaphragm winding mechanism provided in the present application includes: a frame 400 , a reeling position 200 and a tension control mechanism 100 . It should be noted that the reeling position 200 and the tension control assembly 100 are both assembled on the frame 400 .

[0029] The frame 400 is used to provide a mounting position for other components.

[0030] The unwinding position 200 is assembled on the frame 400 , wherein the unwinding position 200 is used to place the diaphragm roll.

[0031] The tension control mechanism 100 is mounted on the frame 400 and is used to control and adjust the tension of the diaphragm during the winding process; the tension control mechanism 100 includes a swing roller assembly 11, a main drive assembly 12 and a winding position 13, and the swing roller assembly 11, the main drive assembly 12 and the winding position 13 are all connected to the frame 400, wherein the swing roller assembly 11 is a device for adjusting the tension of the diaphragm by deflection; the main drive assembly 12 is a device for driving the diaphragm to move; and the winding position 13 is a device for winding the diaphragm. Along the line direction of the diaphragm tape, the main drive assembly 12 is arranged between the swing roller assembly 11 and the winding position 13, and the main drive assembly 12 is connected to the diaphragm; the main drive assembly 12 divides the winding line into a first section and a second section, the swing roller assembly 11 is arranged in the first section, and the winding position 13 is arranged in the second section. It should be noted that the tension of the diaphragms in the first section and the second section can be adjusted separately without interfering with each other. The diaphragm is connected to the swing roller assembly 11 , and the diaphragm is wound on a winding position 13 , and the winding position 13 controls the tension of the diaphragm by actively rotating.

[0032] The diaphragm winding mechanism of the present application is provided with a main drive component 12 between the unwinding position 200 and the winding position 13, and the winding circuit is divided into a first section and a second section, so that the tension of the diaphragm in the two sections can be adjusted separately, ensuring that the tension of the diaphragm during winding is as small as possible. The tension of the diaphragm is adjusted in the first section by the swing roller component 11, and the swing roller component 11 reduces the tension of the diaphragm and makes it uniform by deflection, and then the separation effect of the main drive component 12 is used to further reduce the tension of the diaphragm in the second section, so as to avoid the diaphragm shrinking and squeezing the pole piece after the needle is pulled out at the end of winding, causing the pole piece to wrinkle.

[0033] The following will introduce the technical details of each component one by one.

[0034] In some embodiments, Figure 2 As shown, the main drive assembly 12 includes a first shaft 122 and a second shaft 123, the first shaft 122 is connected to the frame 400, the second shaft 123 is connected to the first shaft 122, and the diaphragm is clamped between the first shaft 122 and the second shaft 123; wherein the first shaft 122 and the second shaft 123 are two shaft rollers pressed against each other, and the diaphragm is clamped between the pressed parts of the two.

[0035] In the winding circuit, the first shaft 122 drives the second shaft 123 to perform synchronous linear motion, and the diaphragm is clamped between the first shaft 122 and the second shaft 123, so that the diaphragm rolls and fits with the first shaft 122 and the second shaft 123 without slipping. Therefore, the main drive component 12 can drive the diaphragm to perform linear motion, and divide the tension of the diaphragm in the circuit into two sections that can be adjusted separately, so that the tension during the winding process of the diaphragm is further reduced, preventing the diaphragm from wrinkling after winding.

[0036] In some embodiments, the main drive assembly 12 also includes a first motor 121; the first motor 121 is connected to the first shaft 122; and / or the first motor 121 is connected to the second shaft 123; the first shaft 122 and the second shaft 123 are pressed tightly together; wherein the first motor is the motor that drives the main drive assembly.

[0037] like Figure 2 As shown, the rotating shaft of the first motor 121 is connected to the first shaft 122 . Of course, the rotating shaft of the first motor may also be connected to the second shaft 123 , or may be connected to both the first shaft 122 , 123 . Figure 2 In the figure, the first motor 121 drives the first shaft 122 to rotate, and then drives the second shaft 123 which is tightly fitted with the first shaft 122 to rotate. When the diaphragm is clamped between the first shaft 122 and the second shaft 123, the diaphragm can be separated and driven by the first shaft 122 and the second shaft 123, so that the tension of the diaphragm located in the first section and the second section can be adjusted separately.

[0038] In some embodiments, Figure 2 As shown, the main drive assembly 12 also includes an outer frame 124 and a moving member 125, the moving member 125 is respectively connected to the second shaft 123 and the outer frame 124, and the moving member 125 can move along the radial direction of the first shaft 122; wherein, the outer frame 124 is a component for fixing the second shaft 123 through the moving member 125 and pressing the second shaft 123 and the first shaft 122, and the moving member 125 is a device for adjusting the pressing position of the second shaft 123 and the first shaft 122.

[0039] During the winding process, the main drive component 12 will have different requirements for the fixed position of the diaphragm according to the width of the diaphragm and the processing requirements. When the diaphragm needs to be pressed and fixed at different positions of the first shaft 122, the pressing position of the second shaft 123 and the first shaft 122 can be changed by sliding the movable member 125 along the outer frame 124, thereby achieving fixation of different positions of the diaphragm, so that the diaphragm winding mechanism can adapt to diaphragms of different widths and fixed positions, thereby enhancing the adaptability of the diaphragm winding mechanism.

[0040] In some embodiments, Figure 1 , Figure 3As shown, the swing roller assembly 11 includes a second motor 111, a guide shaft 112 and a connecting member 113, the second motor 111 is fixed on the frame 400, the guide shaft 112 is connected to the connecting member 113, the connecting member 113 is connected to the rotating shaft of the second motor 111, and the axis line of the rotating shaft is parallel to the axis line of the guide shaft 112 but not on the same straight line; wherein, the second motor 111 is used to drive the guide shaft 112 and the connecting rod 11 to deflect, the connecting rod 113 is a component used to connect the guide shaft 112 with the rotating shaft of the second motor 111, and the guide shaft 112 is a shaft rod used to adjust the diaphragm tension.

[0041] The diaphragm is in contact with the guide shaft 112 .

[0042] When adjusting the tension of the diaphragm in the first section, the tension of the diaphragm is adjusted by the guide shaft 112 of the swing roller assembly 11. By deflecting the guide shaft 112, the pressure between the guide shaft 112 and the diaphragm is maintained at a low level, thereby adjusting and stabilizing the tension of the diaphragm. Through the adjustment of the swing roller assembly 11, the tension of the diaphragm becomes uniform and small after entering the second section, thereby reducing the tension of the diaphragm when it is wound on the winding position 13 as much as possible, thereby preventing the diaphragm from wrinkling after winding.

[0043] In some embodiments, Figure 3 As shown, the guide shaft 112 includes a first guide shaft 1121 and a second guide shaft 1122. The first guide shaft 1121 and the second guide shaft 1122 are both connected to the same side of the connecting member 113. The diaphragm passes between the first guide shaft 1121 and the second guide shaft 1122, and the two side surfaces of the diaphragm are pressed tightly against the first guide shaft 1121 and the second guide shaft 1122 respectively.

[0044] The diaphragm passes through the first guide shaft 1121 and the second guide shaft 1122. During the deflection of the swing roller assembly 11, the first guide shaft 1121 and the second guide shaft 1122 can simultaneously fit with the diaphragm and control the tension of the diaphragm. By adjusting the tension of the diaphragm simultaneously by the first guide shaft 1121 and the second guide shaft 1122, the accuracy of the swing roller assembly 11 in adjusting the tension of the diaphragm can be improved, so that the swing roller assembly 11 can better neutralize and stabilize the tension of the first section of the diaphragm.

[0045] In some embodiments, Figure 1 As shown, the winding position 13 includes a third motor and a winding shaft. The third motor is fixed on the frame 400. The winding shaft is connected to the rotating shaft of the third motor. The third motor can control the winding tension. The third motor drives the winding position 13 to rotate, and the diaphragm is wound on the winding shaft.

[0046] By neutralizing and stabilizing the diaphragm tension in the first section, the tension in the second section is reduced as much as possible under the separating action of the main drive assembly 12, and the third motor can further neutralize the tension during diaphragm winding by controlling the rotation speed, thereby effectively preventing the diaphragm from wrinkling after winding.

[0047] In some embodiments, Figure 1 As shown, the membrane winding mechanism further includes a roller assembly 300, which is connected to the frame 400; the roller assembly 300 includes a first roller 31, which is connected to the frame 400; wherein the roller assembly 300 is composed of a plurality of shafts that support and guide the membrane in the winding circuit, and the first roller 31 is the shaft closest to the unwinding position 200 in the roller assembly 300. In the direction of gravity, the axis center position of the first roller 31 is higher than the axis center position of the unwinding position 200, and the membrane is pressed and fitted against the top of the first roller 31.

[0048] During the diaphragm winding and conveying process, the diaphragm will generate a certain amount of tension under the action of gravity. The axis of the first roller 31 is higher than the axis of the unwinding position 200, and the diaphragm passes through the top of the first roller 31, which can balance the tension of the diaphragm caused by its own gravity. At the same time, it can also prevent the diaphragm roll from self-rotating due to its own gravity when it is rolled on the unwinding position 200, thereby reducing the diaphragm tension and ensuring the stability of the diaphragm winding process.

[0049] In some embodiments, Figure 1 As shown, the roller assembly 300 also includes a second roller 32, which is connected to the frame 400 and is arranged between the first roller 31 and the swing roller assembly 11 along the membrane running direction; wherein the second roller is a roller group that supports the membrane.

[0050] The second roller 32 is composed of a plurality of rollers, which are cross-pressed and tightly fitted with one of the two side surfaces of the diaphragm.

[0051] Since the diaphragm is a flexible material, the diaphragm will also generate a large tension under the action of its own gravity during the winding process. Therefore, the diaphragm needs to be supported in multiple directions by the second roller 32 during the winding process to reduce the tension generated by the diaphragm itself under the action of gravity.

[0052] In some embodiments, as shown in the figure, the roller assembly 300 also includes a third roller 33, which is connected to the frame 400. In the direction of gravity, the axis of the third roller 33 is higher than the axis of the winding position 13, and the third roller 33 is pressed tightly against the diaphragm; wherein the third roller is the shaft rod closest to the winding position in the second section.

[0053] During the winding process, the diaphragm has a soft strip-like structure and will generate some tension under the action of its own gravity. If the axis of the third roller 33 is lower than the axis of the winding position 13, in the direction of gravity, the portion of the diaphragm below the axis of the winding position 13 will generate some tension on the diaphragm under the action of its own gravity, which increases the tension of the diaphragm at the winding position 13 and easily leads to wrinkling of the diaphragm after winding. Therefore, in order to avoid the above situation, the axis of the third roller 33 is higher than the winding position 13, which can avoid the increase of tension of the diaphragm due to its own gravity, thereby preventing the diaphragm from wrinkling after winding.

[0054] In the description of the present invention, it is also necessary to explain 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm winding mechanism, characterized in that: The diaphragm winding mechanism comprises: Frame (400); An unwinding position (200), wherein the unwinding position (200) is mounted on the frame (400); Tension control mechanism (100) The tension control mechanism (100) is mounted on the frame (400), and comprises a swing roller assembly (11), a main drive assembly (12) and a winding position (13), wherein the swing roller assembly (11), the main drive assembly (12) and the winding position (13) are all connected to the frame (400); along the line direction of the diaphragm tape, the main drive assembly (12) is arranged between the swing roller assembly (11) and the winding position (13), and the main drive assembly (12) is connected to the diaphragm; the main drive assembly (12) divides the winding line into a first section and a second section, the swing roller assembly (11) is arranged in the first section, and the winding position (13) is arranged in the second section; the diaphragm is connected to the swing roller assembly (11), the diaphragm is wound on the winding position (13), and the winding position (13) controls the diaphragm tension by actively rotating.

2. The diaphragm winding mechanism according to claim 1, characterized in that: The main drive assembly (12) comprises a first shaft (122) and a second shaft (123), wherein the first shaft (122) is connected to the frame (400), and the second shaft (123) is connected to the first shaft (122), and the diaphragm is clamped between the first shaft (122) and the second shaft (123).

3. The diaphragm winding mechanism according to claim 2, characterized in that: The main drive assembly (12) further comprises a first motor (121), wherein the first motor (121) is connected to the first shaft (122); and / or the first motor (121) is connected to the second shaft (123); and the first shaft (122) and the second shaft (123) are pressed tightly together.

4. The diaphragm winding mechanism according to claim 2, characterized in that: The main drive assembly (12) further comprises an outer frame (124) and a moving member (125), wherein the moving member (125) is respectively connected to the second shaft (123) and the outer frame (124), and the moving member (125) can move along the radial direction of the first shaft (122).

5. The diaphragm winding mechanism according to claim 1, characterized in that: The swing roller assembly (11) comprises a second motor (111), a guide shaft (112) and a connecting member (113); the second motor (111) is fixed on the frame (400); the guide shaft (112) is connected to the connecting member (113); the connecting member (113) is connected to the rotating shaft of the second motor (111); and the axis center line of the rotating shaft is parallel to the axis center line of the guide shaft (112) but is not on the same straight line; The diaphragm is in contact with the guide shaft (112).

6. The diaphragm winding mechanism according to claim 5, characterized in that: The guide shaft (112) includes a first guide shaft (1121) and a second guide shaft (1122), the first guide shaft (1121) and the second guide shaft (1122) are both connected to the same side of the connecting member (113), the diaphragm passes between the first guide shaft (1121) and the second guide shaft (1122), and the two side surfaces of the diaphragm are respectively pressed and fitted with the first guide shaft (1121) and the second guide shaft (1122).

7. The diaphragm winding mechanism according to claim 1, characterized in that: The winding position (13) comprises a third motor and a winding shaft, wherein the third motor is fixed on the frame (400), the winding shaft is connected to the rotating shaft of the third motor, and the third motor can control the winding tension.

8. The diaphragm winding mechanism according to claim 1, characterized in that: The diaphragm winding mechanism also includes a roller assembly (300), and the roller assembly (300) is connected to the frame (400); the roller assembly (300) includes a first roller (31), and the first roller (31) is connected to the frame (400); in the direction of gravity, the axial position of the first roller (31) is higher than the axial position of the unwinding position (200), and the diaphragm is pressed tightly against the top of the first roller (31).

9. The diaphragm winding mechanism according to claim 8, characterized in that: The roller assembly (300) further comprises a second roller (32), wherein the second roller (32) is connected to the frame (400) and is arranged between the first roller (31) and the swing roller assembly (11) along the membrane running direction; The second roller (32) is composed of a plurality of rollers, and the plurality of rollers are pressed tightly against one of the two side surfaces of the diaphragm.

10. The diaphragm winding mechanism according to claim 8, characterized in that: The roller assembly (300) also includes a third roller (33), which is connected to the frame (400). In the direction of gravity, the axis of the third roller (33) is higher than the axis of the winding position (13), and the third roller (33) is pressed tightly against the diaphragm.

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