Material belt thinning device and winding equipment

Abstract

The utility model belongs to the technical field of battery production, and discloses a material belt thinning device and winding equipment. The material belt thinning device comprises an unwinding mechanism, a tension mechanism, a thinning mechanism and a first passing roller. The unwinding mechanism is used for unwinding a material belt, the tension mechanism comprises a tension roller used for bearing the material belt, the thinning mechanism is used for thinning the material belt and comprises a driving part and a thinning assembly in transmission connection with the output end of the driving part, the driving part can drive the thinning assembly to rotate, and the thinning assembly comprises a first thinning roller and a second thinning roller. And at least two first passing rollers are arranged between the first thinning roller and the second thinning roller. The at least two first passing rollers are arranged between the first thinning roller and the second thinning roller, so that the thinning uniformity of the material belt can be adaptively improved according to the thickness change of the material belt in the thinning process.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, and in particular to a strip thinning device and winding equipment. Background Technology

[0002] With the government's continued investment in the new energy industry, more and more manufacturers are increasing their research into new energy lithium battery products. In battery structure, the separator is one of the key components of a lithium-ion battery cell. Its main function is to isolate the positive and negative electrodes, prevent short circuits, and facilitate lithium-ion conduction. The performance of the separator, such as its thickness, determines the battery's interface structure and internal resistance, directly affecting the battery's capacity, cycle life, and safety performance. A high-performance separator plays a crucial role in improving the overall performance of the battery.

[0003] Related technologies often suffer from problems such as excessively thick diaphragms increasing the resistance of the current transmission path, or uneven thickness leading to wrinkles or bulging during winding. In addition, uneven diaphragm thickness can also reduce the alignment of the tabs of the wound battery cell.

[0004] Therefore, there is an urgent need for a strip thinning device and a winding equipment to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a strip thinning device and a winding equipment that can thin the strip and adaptively improve the uniformity of strip thinning.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A strip thinning device, comprising:

[0008] Unwinding mechanism, used for unwinding coiled material strip;

[0009] A tension mechanism for adjusting the tension of the material belt, the tension mechanism including a tension roller for supporting the material belt;

[0010] A thinning mechanism includes a driving member and a thinning component that is pulsatorically connected to the output end of the driving member. The driving member can drive the thinning component to rotate along a thinning axis. The thinning component includes a first thinning roller and a second thinning roller symmetrically arranged on the thinning axis. At least two first passing rollers are arranged between the first thinning roller and the second thinning roller.

[0011] The strip is supported by the tension roller, the first thinning roller, the first pass roller and the second thinning roller.

[0012] Winding equipment, including the strip thinning device as described above.

[0013] The beneficial effects of this utility model are as follows: The strip thinning device provided by this utility model can adjust the tension of the strip by setting a tension mechanism between the unwinding mechanism and the thinning mechanism; by setting at least two first passing rollers between the first thinning roller and the second thinning roller, the driving component drives the first thinning roller and the second thinning roller to rotate according to the thickness change of the strip during the thinning process, and adaptively adjusts the strip length between the thinning roller and the first passing roller, so as to improve the uniformity of strip thinning.

[0014] This utility model also provides a winding device, including the above-mentioned strip thinning device, which can thin the strip and ensure the uniformity of thinning. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the strip thinning device provided in this embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram showing the distance between the two first rollers and the first plane provided in this embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram showing the distance between the projection points of the two first rollers on the first plane and the thinning axis provided in this embodiment of the utility model;

[0018] Figure 4 This is a partial structural schematic diagram of the thinning mechanism from one perspective provided in an embodiment of the present invention;

[0019] Figure 5 This is a partial structural schematic diagram of the thinning mechanism from another perspective provided in this embodiment of the utility model;

[0020] Figure 6 This is a schematic diagram of the coupling and bearing provided in an embodiment of the present invention.

[0021] In the picture:

[0022] 100, Material strip; 200, Tension mechanism; 210, Tension roller; 220, Mounting base; 230, Tension sensor; 300, Thinning mechanism; 310, Drive component; 321, First thinning roller; 322, Second thinning roller; 323, Connecting base; 330, Connecting shaft; 340, Protective shell; 350, Coupling; 360, Bearing; 370, Thinning shaft; 400, First guide roller; 500, Second guide roller. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] like Figures 1 to 6As shown, this embodiment provides a strip thinning device, including an unwinding mechanism, a tension mechanism 200, a thinning mechanism 300, and a first guide roller 400. The unwinding mechanism is used to unwind the strip 100, typically by mechanical means. The tension mechanism 200 is used to adjust the tension of the strip 100, and includes a tension roller 210 for supporting the strip 100. The tension roller 210, through adaptive position changes, ensures that the strip 100 maintains appropriate tension during the thinning process, avoiding excessive tension leading to strip breakage or insufficient tension causing slippage. The thinning mechanism 300 is used to thin the strip 100. The thinning mechanism 300 includes a drive member 310 and a thinning assembly pulsator connected to the output end of the drive member 310. The drive member 310 can drive the thinning assembly to rotate along a thinning shaft 370. The thinning assembly includes a first thinning roller 321 and a second thinning roller 322. Specifically, the drive member 310 can be a motor. At least two first guide rollers 400 are arranged between the first thinning roller 321 and the second thinning roller 322, and the material strip 100 is supported in sequence by the tension roller 210, the first thinning roller 321, the at least two first guide rollers 400 and the second thinning roller 322.

[0028] A tension mechanism 200 is provided between the unwinding mechanism and the thinning mechanism 300, which can adjust the tension of the strip 100. At least two first guide rollers 400 are provided between the first thinning roller 321 and the second thinning roller 322. Based on the thickness change of the strip 100 during the thinning process, the driving member 310 drives the first thinning roller 321 and the second thinning roller 322 to rotate, adaptively adjusting the length of the strip 100 between the two thinning rollers and the first guide rollers 400, thereby improving the uniformity of the strip 100's thinning. In this embodiment, the strip 100 is a separator. In other embodiments, the strip 100 can also be a electrode sheet or a composite electrode sheet formed by combining an electrode sheet and a separator, or other materials that require thinning, used in battery cell manufacturing.

[0029] See also Figure 1 Optionally, a second guide roller 500 is provided on both sides of the tension roller 210, which can stretch or expand the strip 100 laterally or longitudinally to ensure that the strip 100 has a uniform thickness. This embodiment also provides a winding device, including the above-mentioned strip thinning device. By using the above-mentioned strip thinning device, the winding device can thin the strip 100 and ensure the uniformity of thinning.

[0030] See Figure 2In this embodiment, two first guide rollers 400 are provided between the first thinning roller 321 and the second thinning roller 322. The two first guide rollers 400 are respectively located on the side closer to and farther away from the tension roller 210 between the first thinning roller 321 and the second thinning roller 322. The distance between the first thinning roller 321 and the second thinning roller 322 is d, and the distance between the two first guide rollers 400 in the horizontal direction is D. The range of d+D is 0.2m-0.8m. If the value of d+D is too large, the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too long, and the thinning effect will be poor. If the value of d+D is too small, the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too short, and the material strip 100 will easily wrinkle due to excessive tension.

[0031] Optionally, the horizontal distance D (i.e., d1+d2) between the two first guide rollers 400 is in the range of 0.2m-0.7m, preferably 220mm. If the distance D is too large, the two first guide rollers 400 will occupy a large space, and the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too long, resulting in a poor thinning effect. If the distance D is too small, the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too short, and the material strip 100 will easily wrinkle due to excessive tension.

[0032] Optionally, the distance d between the first thinning roller 321 and the second thinning roller 322 is in the range of 0.06m-0.5m, preferably 100mm. If the distance d is too large, the first thinning roller 321 and the second thinning roller 322 will occupy a large space; if the distance d is too small, the rotation amplitude of the thinning component will be too small, and the thinning effect will be poor.

[0033] In some possible implementations, there are two first passing rollers 400, with the first thinning roller 321 and the second thinning roller 322 forming a first plane, and the thinning shaft 370 located on the first plane. The distances between the two first passing rollers 400 and the first plane are different; and / or, the distances between the projection points of the two first passing rollers 400 on the first plane and the thinning shaft 370 are different. This configuration results in different lengths of the strip 100 between the first thinning roller 321 and a first pass roller 400, and between the second thinning roller 322 and another first pass roller 400. During the thinning process, the drive unit 310 is activated, which drives the thinning assembly to rotate. The first thinning roller 321 and the second thinning roller 322 rotate relative to the thinning shaft 370. According to the required degree of thinning of the strip 100, the length of the strip 100 between the first thinning roller 321 and a first pass roller 400, and between the second thinning roller 322 and another first pass roller 400 is continuously adjusted to perform thinning treatment on the strip 100, which can effectively improve the thinning uniformity of the strip 100.

[0034] like Figure 3As shown, optionally, two first passing rollers 400 are provided. The first thinning roller 321 and the second thinning roller 322 form a first plane, and the thinning shaft 370 is located on the first plane. The projection points of the two first passing rollers 400 on the first plane are equidistant from the thinning shaft 370, i.e., d3 = d4. The horizontal spacing D between the two first passing rollers 400 ranges from 0.2m to 0.7m. If the spacing D is too large, the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too long, resulting in a poor thinning effect. If the spacing D is too small, the material strip 100 between the first thinning roller 321 and the second thinning roller 322 will be too short, and wrinkles may easily appear during the thinning process due to excessive tension. In other embodiments, multiple first passing rollers 400 can also be provided simultaneously. Multiple first passing rollers 400 cooperate to ensure the uniformity of thinning of the material strip 100, such as three or four, etc., which can be set as needed.

[0035] Preferably, the strip thinning device includes a support base, on which the first guide roller 400 is slidably mounted radially, facilitating position adjustment. Exemplarily, the support base includes two parallel support plates with elongated sliding holes. The two ends of the central shaft of the first guide roller 400 are slidably inserted into the elongated sliding holes of the two support plates. After the position of the first guide roller 400 is determined, the two ends of the central shaft of the first guide roller 400 are locked to the support plates by two locking blocks. Specifically, the locking blocks have threaded holes, and the support plates have multiple connecting holes evenly distributed along the length of the elongated sliding holes. The two locking blocks are respectively installed on the connecting holes of the support plates via threaded components, and the two locking blocks are located on both sides of the central shaft of the first guide roller 400. By slidably mounting the first guide roller 400 on the support plates, when the position of the first guide roller 400 needs to be adjusted, it can simply be slid along the support plates to the appropriate position, making operation convenient; moreover, the support base has a simple structure and low manufacturing cost.

[0036] In this embodiment, thickness detectors are installed on both the first thinning roller 321 and the second thinning roller 322. The thickness detectors can obtain the thickness value of the material strip 100 supported and wound on the first thinning roller 321 and the second thinning roller 322 in real time. Based on the thickness value, the drive component 310 cooperates to drive the thinning component to rotate at an appropriate angle to improve the thinning uniformity of the material strip 100.

[0037] See Figures 4 to 6 Optionally, the thinning assembly also includes a connecting seat 323, with connecting holes at both ends. The first thinning roller 321 and the second thinning roller 322 are connected to the two connecting holes one-to-one. The middle part of the connecting seat 323 is connected to the output end of the drive component 310 via a connecting shaft 330, and the central axis of the connecting shaft 330 forms a thinning shaft 370. The structure is simple and assembly is easy.

[0038] In this embodiment, the thinning mechanism 300 may further include a protective shell 340. The protective shell 340 is mounted on the fixed end of the drive member 310 and is spaced out from the output end of the drive member 310. The connecting shaft 330 rotatably passes through the mounting hole of the protective shell 340 via a bearing 360. The connecting shaft 330 and the output end of the drive member 310 are connected via a coupling 350. The protective shell 340 can protect the connection structure between the connecting shaft 330 and the output end of the drive member 310 from damage by the external environment.

[0039] Optionally, the tension mechanism 200 further includes a mounting base 220 and a tension sensor 230. The tension roller 210 is movably connected to the mounting base 220, and the tension sensor 230 is mounted on the tension roller 210. The mounting base 220 is used to support and fix the tension roller 210 and the tension sensor 230, and the tension sensor 230 is used to detect the tension on the material belt 100.

[0040] In this embodiment, the tension roller 210 includes a roller body and an adjusting rod. The roller body is rotatably sleeved on the adjusting rod, which is movably installed within the limiting hole of the mounting base 220. The tension mechanism 200 also includes a bracket, which is installed on the mounting base 220 and spaced at the bottom of the tension roller 210. An elastic element is provided between the bracket and the adjusting rod. The elastic element can be a spring. This arrangement makes the position adjustment of the tension roller 210 convenient and flexible in use.

[0041] Optionally, the tension mechanism 200 is slidably mounted on the support base and locked to the support base by a locking member. For example, the support base is provided with a dovetail groove passing through both sides, and the mounting base 220 of the tension mechanism 200 has a dovetail protrusion that mates with the dovetail groove. The dovetail protrusion slides through an opening on one side of the dovetail groove and is inserted into the dovetail groove. The bottom of the dovetail groove is provided with multiple mounting holes evenly distributed along its length, and the dovetail protrusion is provided with a locking hole. By sliding the dovetail protrusion along the dovetail groove, the distance between the tension mechanism 200 and the thinning mechanism 300 is adjusted. Once the distance between the tension mechanism 200 and the thinning mechanism 300 is determined, a threaded member passes through the mounting hole of the support base and is screwed into the locking hole to fix the position of the tension mechanism 200. This arrangement facilitates the adjustment of the distance between the tension mechanism 200 and the thinning mechanism 300, thereby adjusting the length of the material strip 100 between the tension roller 210 and the thinning component, and improving the adjustment of the tension variation of the material strip 100.

[0042] This embodiment also provides a winding device, including the above-mentioned strip thinning device, which can thin the strip and ensure the uniformity of thinning.

[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A strip thinning device, characterized in that, include: An unwinding mechanism for unwinding the strip (100); Tension mechanism (200) for adjusting the tension of the strip (100), the tension mechanism (200) includes a tension roller (210) for supporting the strip (100); The thinning mechanism (300) includes a drive member (310) and a thinning component that is pulsatorically connected to the output end of the drive member (310). The drive member (310) can drive the thinning component to rotate along the thinning shaft (370). The thinning component includes a first thinning roller (321) and a second thinning roller (322) symmetrically arranged on the thinning shaft (370). At least two first guide rollers (400) are arranged between the first thinning roller (321) and the second thinning roller (322). The strip (100) is supported in sequence by the tension roller (210), the first thinning roller (321), at least two first passing rollers (400) and the second thinning roller (322).

2. The web thinning apparatus of claim 1, wherein Two first guide rollers (400) are disposed between the first thinning roller (321) and the second thinning roller (322). The two first guide rollers (400) are respectively disposed on the side of the first thinning roller (321) and the second thinning roller (322) closer to and farther away from the tension roller (210). The distance between the first thinning roller (321) and the second thinning roller (322) is d, and the horizontal distance between the two first guide rollers (400) is D. The range of d+D is 0.2m-0.8m.

3. The web thinning apparatus of claim 2, wherein The horizontal spacing D between the two first rollers (400) ranges from 0.2m to 0.7m.

4. The web thinning apparatus of claim 2, wherein The distance d between the first thinning roller (321) and the second thinning roller (322) ranges from 0.06m to 0.5m.

5. The web thinning apparatus of claim 1 wherein, There are two first passing rollers (400). The first thinning roller (321) and the second thinning roller (322) form a first plane. The thinning shaft (370) is located on the first plane. The projection points of the two first passing rollers (400) on the first plane are at the same distance from the thinning shaft (370). The horizontal spacing D of the two first passing rollers (400) ranges from 0.2m to 0.7m.

6. The web thinning apparatus of claim 1 wherein, There are two first passing rollers (400), the first thinning roller (321) and the second thinning roller (322) form a first plane, the thinning shaft (370) is located on the first plane, and the distance between the two first passing rollers (400) and the first plane is different; And / or, the projection points of the two first rollers (400) on the first plane are at different distances from the thinning shaft (370).

7. The web thinning apparatus of claim 1 wherein, The thinning component also includes a connecting seat (323), with connecting holes at both ends. The first thinning roller (321) and the second thinning roller (322) are connected to the two connecting holes one by one. The middle part of the connecting seat (323) is connected to the output end of the driving member (310) through a connecting shaft (330). The central axis of the connecting shaft (330) forms the thinning shaft (370).

8. The web thinning apparatus of claim 7, wherein, The thinning mechanism (300) further includes a protective shell (340), which is installed on the fixed end of the drive member (310) and is spaced out from the output end of the drive member (310). The connecting shaft (330) is rotatably inserted through the mounting hole of the protective shell (340) via a bearing (360), and the connecting shaft (330) is connected to the output end of the drive member (310) via a coupling (350).

9. The web thinning apparatus of claim 1 wherein, Both the first thinning roller (321) and the second thinning roller (322) are equipped with thickness detectors.

10. The web thinning apparatus of claim 1 wherein, The tension mechanism (200) further includes a mounting base (220), the tension roller (210) includes a roller body and an adjusting rod, the roller body is rotatably sleeved on the adjusting rod, the adjusting rod is radially movably installed in the limiting hole of the mounting base (220), the tension mechanism (200) further includes a bracket, the bracket is installed on the mounting base (220) and spaced at the bottom of the tension roller (210), and an elastic element is provided between the bracket and the adjusting rod.

11. The strip thinning device according to claim 10, characterized in that, The tension roller (210) is provided with a second guide roller (500) on both sides.

12. The web thinning apparatus of claim 1 wherein, The strip thinning device includes a support base, which includes two parallel support plates. The support plates are provided with elongated sliding holes. The two ends of the central shaft of the first roller (400) are respectively slidably inserted into the elongated sliding holes of the two support plates. After the position of the first roller (400) is determined, the two ends of the central shaft of the first roller (400) are respectively locked to the support plates by two locking blocks.

13. The web thinning apparatus of claim 12, wherein, The locking block is provided with a threaded hole, and the support plate is provided with a plurality of connecting holes evenly distributed along the length direction of the elongated sliding hole. The two locking blocks are respectively installed on the connecting holes of the support plate through threaded parts, and the two locking blocks are located on both sides of the central axis of the first roller (400).

14. Winding apparatus, characterized in that Includes the strip thinning device as described in any one of claims 1-13.

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