Roller passing mechanism

Abstract

The embodiment of the utility model provides a roller passing mechanism. The roller passing mechanism comprises a roller shaft, a roller body and a tab folding prevention structure, the roller body is arranged on the roller shaft in a sleeving manner and can rotate around the roller shaft, and the tab folding prevention structure is fixedly connected to at least one side of the roller shaft in the axial direction and is spaced from the roller body; the tab folding prevention structure is provided with a circumferential surface matched with the roller body, and the circumferential surface comprises an adsorption surface and a supporting surface which are sequentially arranged in the circumferential direction; when the roller body rotates around the roller shaft, the adsorption surface is used for adsorbing the tab, and the supporting surface is used for assisting in supporting the tab. In the embodiment of the invention, the tab folding prevention structure comprises the adsorption surface and the supporting surface which are sequentially arranged along the circumferential direction, and when the current collector passes through the roller, the tab is firstly close to the adsorption surface, and the adsorption surface can adsorb the tab, so that the tab folding is prevented; the tab is in contact with the supporting surface after passing through the adsorption surface, and the supporting surface has a certain auxiliary supporting effect on the tab, so that the tab can smoothly pass through the roller passing mechanism under the condition that the tab is not turned over.

Description

Technical Field

[0001] This application belongs to the technical field of battery production, and particularly relates to a roll passing mechanism. Background Art

[0002] With the development of battery production technology, various types of batteries have been widely used in various technical fields. As a part of the battery electrode tab, the electrode tab can be used as a connecting piece to realize the connection between the inside and outside of the battery. In the die-cutting and winding processes of the battery current collector, due to the characteristics of the material and structure of the electrode tab, the electrode tab is prone to folding or even tearing when passing through the roller, which affects the product yield of the electrode sheet and the battery cell.

[0003] In the related art, after the electrode tab is folded, a flattening plate is set to flatten the folded electrode tab, but this method does not fundamentally solve the problem of electrode tab folding and affects the battery production efficiency. Utility Model Content

[0004] This application aims to provide a roll passing mechanism to solve the problem that the electrode tab is prone to folding during the roll passing process, which affects the product yield of the electrode sheet and the battery cell.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] This application discloses a roll passing mechanism, including: a roller shaft, a roller body, and an electrode tab anti-folding structure; wherein,

[0007] The roller body is sleeved on the roller shaft and can rotate around the roller shaft, and the electrode tab anti-folding structure is fixedly connected to at least one side of the roller shaft along the axial direction and is spaced from the roller body;

[0008] The electrode tab anti-folding structure has a circumferential surface matching the roller body, and the circumferential surface includes an adsorption surface and a support surface arranged in sequence along the circumferential direction; when the roller body rotates around the roller shaft, the adsorption surface is used for adsorbing the electrode tab, and the support surface is used for assisting in supporting the electrode tab.

[0009] Optionally, the electrode tab anti-folding structure includes a housing, the housing is provided with a negative pressure chamber, the adsorption surface is provided with adsorption holes, and the negative pressure chamber is communicated with the external atmosphere through the adsorption holes.

[0010] Optionally, the number of the adsorption holes is multiple, and the multiple adsorption holes are spaced on the adsorption surface.

[0011] Optionally, the number of the adsorption holes is multiple, and the density of the multiple adsorption holes decreases from the side far from the support surface to the side close to the support surface along the adsorption surface; and / or,

[0012] The negative pressure cavity is an arc-shaped hollow cavity, and the size of the arc-shaped hollow cavity along the radial direction of the shell decreases from the side far away from the supporting surface to the side close to the supporting surface.

[0013] Optionally, a negative pressure hole is further provided on the shell, and the negative pressure hole is communicated with the negative pressure cavity and is used for connecting a negative pressure tube.

[0014] Optionally, at least a portion of the adsorption surface and the support surface are arranged to be inclined upward.

[0015] Optionally, the support surface gradually bulges relative to the surface of the roller body in a circumferential direction away from the adsorption surface.

[0016] Optionally, the shell is provided with a hollow portion, the hollow portion is separated from the negative pressure chamber by a partition, and the hollow portion extends along the axial direction of the shell.

[0017] Optionally, the anti-pole ear folding structure is further provided with a fixing portion, the fixing portion is arranged on a side of the shell away from the adsorption surface and the supporting surface, and the fixing portion is fixedly connected to the roller shaft.

[0018] Optionally, a mounting hole is provided on the fixing portion, and the mounting hole is used to pass a fastener so as to fix the anti-polar ear folding structure to the roller shaft.

[0019] In the embodiment of the present application, since the anti-pole ear folding structure includes an adsorption surface and a support surface arranged in sequence along the circumferential direction, when the roller body of the roller mechanism rotates around the roller axis, since the anti-pole ear folding structure is fixedly connected to the roller axis, the anti-pole ear folding structure can remain stationary. During the roller passing process of the current collector, the pole ear first approaches the adsorption surface, and the adsorption surface can adsorb the pole ear, thereby preventing the pole ear from folding; after the pole ear passes the adsorption surface, it will contact the support surface, and the support surface plays a certain auxiliary supporting role for the pole ear, which can ensure that the pole ear can smoothly pass through the roller mechanism without folding.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a structural schematic diagram of the anti-ear folding structure described in the embodiment of the present application;

[0023] Figure 2 It is a front view of the anti-ear folding structure described in the embodiment of the present application;

[0024] Figure 3 It is a side view of the anti-tab folding structure described in the embodiment of the present application;

[0025] Figure 4 It is a top view of the anti-tab folding structure described in the embodiment of the present application;

[0026] Figure 5 It is a schematic structural diagram of a roller described in the embodiment of the present application;

[0027] Figure 6 It is a front view of a roller described in the embodiment of the present application;

[0028] Figure 7 It is a top view of a roller described in the embodiment of the present application;

[0029] Figure 8 It is a schematic structural diagram of another roller described in the embodiment of the present application;

[0030] Figure 9 It is a front view of another roller described in the embodiment of the present application;

[0031] Figure 10 It is a top view of another roller described in the embodiment of the present application;

[0032] Figure 11 It is a schematic diagram of the force analysis principle of the tab in one tape running direction;

[0033] Figure 12 It is a schematic diagram of the force analysis principle of the tab in another tape running direction.

[0034] Reference numerals: 10 - anti-tab folding structure, 100 - circumferential surface, 101 - adsorption surface, 102 - support surface, 11 - housing, 12 - negative pressure chamber, 13 - adsorption hole, 14 - negative pressure hole, 15 - hollowed-out part, 16 - fixing part, 17 - mounting hole, 18 - partition, 20 - roller shaft, 30 - roller body. Detailed Description of the Embodiment

[0035] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0036] The terms "first", "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0038] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in this application can be understood according to specific circumstances.

[0039] With the development of battery production technology, various types of batteries have been widely used in various technical fields. As a part of the battery electrode tab, the tab has characteristics such as light weight, high conductivity, and good corrosion resistance, and can be used as a connecting piece to realize the connection between the inside and outside of the battery. In the die-cutting and winding processes of the battery current collector, when the structure of the tab is relatively thin and the material strength is insufficient, the tab is prone to folding or even tearing when passing through the roller, which affects the product yield of the electrode sheet and the battery cell.

[0040] In order to avoid the reduction of the product yield of the battery cell caused by the folding of the tab, when the tab is folded, secondary operations are usually required. For example, manually pick out the die-cut tab roll and the wound battery cell, manually flatten the tab, and after secondary determination, send it to the downstream conveyor. The existing method uses a flattening plate to support the tab after folding, but it does not solve the root cause of the tab folding. After the tab is folded, the angle of the flattening plate is adjusted by manual experience to balance production, which takes a long time and the effect is not obvious. The problem of tab folding recurs and cannot be eliminated, resulting in a high scrap rate of the electrode sheet and the battery cell, and reducing the operating efficiency of the automated equipment.

[0041] Based on the above problems, the present application discloses a roller passing mechanism. According to the roller passing mechanism provided by the embodiments of the present application, the tab can be adsorbed by the adsorption surface in the tab anti-folding structure, effectively reducing the probability of tab folding and improving the product yield.

[0042] The following further describes in detail the roller passing mechanism provided by the embodiments of the present application in conjunction with the accompanying drawings and specific embodiments.

[0043] As Figures 5 to 10 shown, in the roller passing mechanism disclosed in the present application, it may specifically include: a roller shaft 20, a roller body 30, and a tab anti-folding structure 10. Specifically, the roller shaft 20 is a cylindrical structure and is fixedly arranged at the installation position. The roller body 30 is a cylindrical structure and is sleeved on the roller shaft 20 and can rotate around the roller shaft 20. The tab anti-folding structure 10 is fixedly connected to at least one side of the roller shaft 20 along the axial direction and is spaced from the roller body 30. The tab anti-folding structure 10 has a circumferential surface 100 matching the roller body. The circumferential surface 100 includes an adsorption surface 101 and a support surface 102 arranged in sequence along the circumferential direction. When the roller body 30 rotates around the roller shaft 20, the adsorption surface 101 is used to adsorb the tab, and the support surface 102 is used to assist in supporting the tab.

[0044] It should be noted that in the embodiments of the present application, the roller body 30 is a cylindrical structure. Further, as Figures 1 to 4 shown, the tab anti-folding structure 10 is a substantially semi-circular structure, and the radius of the tab anti-folding structure 10 is approximately equal to the radius of the roller body 30, so that its circumferential surface 100 matches the roller body 30. In such a structure, the main part of the electrode tab is wound around the outer surface of the roller body 30, and the tab can overlap on the circumferential surface 100 of the tab anti-folding structure 10 to obtain a certain supporting force. Among them, the adsorption surface 101 of the tab anti-folding structure 10 can adsorb the tab to prevent the tab from folding and failing, which affects the product yield of the battery cell. After the tab passes through the adsorption surface 101, it will contact the support surface 102, and the support surface 102 plays a certain auxiliary supporting role for the tab, which can ensure that the tab passes through the roller passing mechanism smoothly without folding.

[0045] Optionally, in the embodiments of the present application, the tab anti-folding structure 10 includes a housing 11. The housing 11 is provided with a negative pressure chamber 12. The adsorption surface 101 is provided with adsorption holes 13, and the negative pressure chamber 12 is connected to the external atmosphere through the adsorption holes 13.

[0046] Specifically, the housing 11 is a substantially semi-circular housing 11, and its circumferential surface 100 is arc-shaped to adapt to the outer surface of the roller body 30. The housing 11 is provided with circular adsorption holes 13, and the air pressure inside the negative pressure chamber 12 is lower than the air pressure of the external atmosphere. When the electrode tab passes through the roller, the tab overlaps on the adsorption surface 101.

[0047] In the embodiments of the present application, the design of the negative pressure chamber 12 creates a low-pressure area within the housing 11. When the external atmosphere communicates with the negative pressure chamber 12 through the adsorption holes 13, a strong adsorption force is generated on the adsorption surface 101 by utilizing the air pressure difference. This physical adsorption method can effectively and stably fix the tab. Even when the roller body 30 rotates at a high speed or the tension of the current collector changes significantly, it can ensure that the tab closely adheres to the adsorption surface 101, thereby greatly reducing the risk of tab folding. Since the adsorption surface 101 can reliably adsorb the tab, it reduces production interruptions and the generation of defective products caused by tab folding, significantly improving the continuity and stability of the production line. This not only speeds up the production speed but also improves the overall quality and yield of the product, reducing production costs.

[0048] In addition, under this tab anti-folding structure 10, the structure is relatively simple and does not require complex mechanical structures or control systems, making the design of the entire tab anti-folding structure 10 more concise and compact. At the same time, this design also facilitates subsequent maintenance and servicing work, reducing the equipment maintenance cost and downtime.

[0049] Optionally, the number of adsorption holes 13 is multiple, and the multiple adsorption holes 13 are arranged at intervals on the adsorption surface 101.

[0050] Specifically, the adsorption holes 13 can be evenly spaced on the adsorption surface 101, or the distribution density of the adsorption holes 13 can also be set to be uneven. It can be understood that regardless of whether the multiple adsorption holes 13 are evenly arranged, the design of the multiple adsorption holes 13 can improve the uniformity of the adsorption force exerted by the negative pressure chamber 12 on the tab surface through each pore channel, avoiding the problem of local stress concentration that may be caused by single-point adsorption. In this way, not only the stability of the tab being adsorbed is improved, but also the firmness of the adsorption is enhanced, effectively preventing the tab from accidentally falling off or folding during the high-speed roller passing process.

[0051] It should be noted that since tabs of different sizes, shapes, and materials may have different requirements for adsorption force, in practical applications, by adjusting the number, size, and distribution of the adsorption holes 13, the adsorption requirements of different tabs can be flexibly adapted to ensure a stable and reliable adsorption effect under various working conditions. This design improves the versatility and adaptability of the roller passing mechanism and reduces the dependence on specific tabs.

[0052] In some alternative embodiments of the present application, as Figure 1 shown, the number of adsorption holes 13 is multiple, and the density of the multiple adsorption holes 13 decreases from the side of the adsorption surface 101 far from the support surface 102 to the side close to the support surface 102.

[0053] Specifically, multiple adsorption holes 13 can be arranged in multiple rows. Among them, the multiple adsorption holes 13 distributed along the axial direction of the housing 11 form one row. The spacing between each row of adsorption holes 13 can be set to be the same, and the spacing between multiple rows of adsorption holes 13 along the circumferential direction of the housing 11 can be decreased. When the roller body 30 rotates around the roller shaft 20, the tab first contacts the adsorption surface 101 and then approaches the support surface 102. It can be understood that the design decreases from the side far from the support surface 102 to the side close to the support surface 102. This design enables the tab to be affected by denser adsorption holes 13 when initially contacting the adsorption surface 101, so as to be adsorbed quickly and firmly. As the tab continues to move towards the support surface 102, the density of the adsorption holes 13 gradually decreases. However, at this time, the tab has been stably adsorbed, reducing the waste of unnecessary adsorption force while maintaining the stability of adsorption. This gradient distribution of the adsorption holes 13 not only improves the adsorption efficiency but also ensures a smooth transition of the tab during the entire roller passing process.

[0054] In some other alternative embodiments of the present application, as Figure 1 shown, the negative pressure cavity 12 is an arc-shaped hollow cavity, and the size of the arc-shaped hollow cavity along the radial direction of the housing 11 decreases from the side far from the support surface 102 to the side close to the support surface 102.

[0055] It should be noted that when the negative pressure cavity 12 is designed as the above structure, the air flow distribution in the negative pressure cavity 12 is more reasonable. Specifically, on the side far from the support surface 102, the larger radial size provides a broader negative pressure action area, which helps to quickly form a stable negative pressure environment; while on the side close to the support surface 102, as the radial size decreases, the negative pressure intensity is relatively concentrated, enhancing the adsorption force on the tab. This design not only improves the utilization rate of the negative pressure cavity 12 but also enables the negative pressure effect to act more precisely on the tab, further preventing the tab from folding.

[0056] In addition, in some other alternative embodiments of the present application, the density of the multiple adsorption holes 13 decreases from the side far from the support surface 102 to the side close to the support surface 102 along the adsorption surface 101. At the same time, the size of the arc-shaped hollow cavity along the radial direction of the housing 11 decreases from the side far from the support surface 102 to the side close to the support surface 102.

[0057] It can be understood that when the tab folding prevention structure 10 simultaneously satisfies the above two structures, the adsorption performance of the tab folding prevention structure 10 in the roller passing mechanism on the tab can be significantly enhanced, improving the adsorption efficiency and stability.

[0058] In the embodiment of the present application, a negative pressure hole 14 is further provided on the housing 11. The negative pressure hole 14 is communicated with the negative pressure cavity 12 and is used to connect a negative pressure pipe.

[0059] In practical applications, the negative pressure hole 14 serves as a bridge connecting the negative pressure chamber 12 and the external negative pressure source, so that the pressure in the negative pressure chamber 12 can be more accurately adjusted and maintained, thereby ensuring the stable adsorption effect of the adsorption surface 101 on the tab. At the same time, the design of the negative pressure hole 14 facilitates the connection of the negative pressure pipe, realizes the integration and modularization of the negative pressure system, simplifies the installation and maintenance process, and improves the flexibility and maintainability of the overall equipment.

[0060] In the embodiment of the present application, at least a portion of the adsorption surface 101 and the support surface 102 are tilted upward.

[0061] Specifically, refer to Figure 11 , is a schematic diagram of the force analysis of the pole ear in a certain belt-running direction, where the pole piece passes through the belt along the roller body 30, and a reference point a1 is taken on the pole ear on the arc AB side. The force analysis of the pole ear a1 is performed, and it can be seen that the pole ear is subjected to a tensile force F along the direction of movement of the pole piece. 拉 , the ear's own gravity G1 and the roller surface support force F 支 Under the action of the three forces, the vector force F 合1 , it can be seen that in F 合1 Under the action, the a1 pole ear shows an upward tilting trend; at the same time, the reference point b2 is taken on the arc BC side pole ear, and the force analysis of the b2 pole ear is carried out. It can be seen that the ear is subjected to the tensile force F along the direction of the pole piece movement. 拉 , the weight of the tab itself G2 and the support force of the roller surface F 支 Under the action of the three forces, the vector force F 合2 , it can be seen that in F 合2 Under this effect, the b2 tab shows a downward trend.

[0062] Refer to Figure 12 , is the force analysis principle diagram of the pole ear in another belt running direction, in which the pole piece passes through the belt along the roller body 30, and the reference point c3 is taken on the pole ear on the arc DE side. The force analysis of the c3 pole ear shows that the pole ear is subjected to the tensile force F along the direction of the pole piece movement. 拉 , the weight of the tab itself G3 and the support force of the roller surface F 支 Under the action of the three forces, the vector force F 合3 , it can be seen that in F 合3 Under the action, the c3 pole ear shows an upward tilting trend; at the same time, the reference point d4 is taken on the arc EH side pole ear, and the force analysis of the d4 pole ear is carried out. It can be seen that the ear is subjected to the tensile force F along the direction of the pole piece movement. 拉 , the weight of the tab itself G4 and the support force of the roller surface F 支 Under the action of the three forces, the vector force F 合4 , it can be seen that in F 合4 Under this effect, the d4 pole ear shows a downward drooping trend.

[0063] It should be noted that as Figure 11 , Figure 12 shown, when at least a part of the adsorption surface 101 and the support surface 102 is inclined upward, the tab rotates from one side of the adsorption surface 101 to contact the adsorption surface 101, and the tab can fit more naturally onto the adsorption surface 101 when contacting the adsorption surface 101, thereby increasing the contact area between the adsorption surface 101 and the tab. This design helps to improve the adsorption force, enables the tab to be adsorbed more firmly, and prevents the tab from accidentally folding or falling off during the process of passing through the roller. At the same time, the inclined upward support surface 102 not only provides the necessary support force for the tab but also enables the tab to transition more smoothly when passing through the support surface 102.

[0064] It can be understood that the inclined upward setting of the adsorption surface 101 and the support surface 102 is only applicable to the case where the running direction of the tab is downward. In order to achieve the functions of adsorption and support, the adsorption surface 101 and the support surface 102 can be set in the opposite direction to the running direction of the tab.

[0065] Optionally, the support surface 102 gradually protrudes relative to the surface of the roller body 30 along the circumference away from the adsorption surface 101.

[0066] Specifically, as Figure 5 shown, from the side close to the adsorption surface 101 to the side away from the adsorption surface 101, the distance between the support surface 102 and the roller shaft 20 increases, causing the support surface 102 to gradually protrude outward.

[0067] It should be noted that for some tabs with relatively special shapes or easy to deform, the gradually protruding design of the support surface 102 can better fit its contour and provide a more uniform and stable support force for the tab. This helps to maintain the original shape of the tab during the process of passing through the roller, reduce the shape change caused by uneven stress, and improve the quality and consistency of the product.

[0068] Furthermore, the housing 11 is provided with a hollowed - out portion 15, which is separated from the negative pressure chamber 12 by a partition 18, and the hollowed - out portion 15 extends along the axial direction of the housing 11.

[0069] In specific applications, in order to adapt to tabs of different sizes, the housing 11 of the tab - anti - folding structure 10 may also have relatively large sizes, and these sizes include circumferential dimensions and radial dimensions. When the size of the housing 11 is large, the overall mass of the tab - anti - folding structure 10 may be large. Therefore, the setting of the hollowed - out portion 15 reduces the material usage of the housing 11, can effectively reduce the overall weight of the tab - anti - folding structure 10, enables the roller - passing mechanism to reduce energy consumption during operation, and improves the operation efficiency. At the same time, the setting of the partition 18 forms the effect of a reinforcing rib, improves the structural rigidity of the housing 11, and ensures the stability and durability of the tab - anti - folding structure 10 during long - term use.

[0070] In the above embodiments, the hollowed-out portion 15 is a lateral hollowing-out of the housing 11; in still other embodiments, the hollowed-out portion 15 axially penetrates the entire housing 11 along the housing 11.

[0071] Optionally, the anti-tab folding structure 10 is further provided with a fixing portion 16, and the fixing portion 16 is disposed on a side of the housing 11 facing away from the adsorption surface 101 and the support surface 102, and the fixing portion 16 is fixedly connected to the roller shaft 20.

[0072] Specifically, the fixing portion 16 can be connected to the roller shaft 20 by a fastener, or the fixing portion 16 can be adhered to the roller shaft 20. In addition, the fixing portion 16 can also be welded to the roller shaft 20. Among them, the connection manner between the fixing portion 16 and the roller shaft 20 can be comprehensively selected according to factors such as the materials, quality, and dimensions of the roller shaft 20 and the housing 11, and the present application does not make specific limitations in this regard. It should be noted that the fixing portion 16 provides a support point for the connection between the anti-tab folding structure 10 and the roller shaft 20, ensuring the connection stability and reliability between the two.

[0073] Further, an installation hole 17 is provided on the fixing portion 16, and the installation hole 17 is used for passing a fastener to fix the anti-tab folding structure 10 to the roller shaft 20.

[0074] Specifically, the number of the installation holes 17 is multiple, and the multiple installation holes 17 are evenly spaced on the fixing portion 16. In the case where the installation holes 17 are provided, the installation holes 17 can pass through fasteners to fix the anti-tab folding structure 10 on the roller shaft 20 through the fasteners. At this time, the anti-tab folding structure 10 and the roller shaft 20 are detachably connected. When it is necessary to replace or maintain the anti-tab folding structure 10, it is easier to disassemble and install the anti-tab folding structure 10 from the roller shaft 20. This reduces the maintenance difficulty, shortens the equipment downtime, and improves the overall operation efficiency of the production line.

[0075] In summary, the over-roller mechanism provided by the embodiments of the present application has at least the following advantages:

[0076] In the embodiments of the present application, since the anti-tab folding structure includes an adsorption surface and a support surface sequentially arranged in the circumferential direction, when the roller body of the over-roller mechanism rotates around the roller shaft, since the anti-tab folding structure is fixedly connected to the roller shaft, the anti-tab folding structure can remain stationary. During the over-roller process of the current collector, the tab first approaches the adsorption surface, and the adsorption surface can adsorb the tab, thereby preventing the tab from folding; after the tab passes through the adsorption surface, it will contact the support surface, and the support surface plays a certain auxiliary support role for the tab, which can ensure that the tab can smoothly pass through the over-roller mechanism without folding.

[0077] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A roller mechanism, characterized in that: include: A roller shaft (20), a roller body (30) and a tab folding prevention structure (10); wherein: The roller body (30) is sleeved on the roller shaft (20) and can rotate around the roller shaft (20); the anti-ear folding structure (10) is fixedly connected to at least one side of the roller shaft (20) along the axial direction and is spaced apart from the roller body (30); The anti-tip folding structure (10) has a circumferential surface (100) matching the roller body, and the circumferential surface (100) includes an adsorption surface (101) and a support surface (102) arranged in sequence along the circumference; when the roller body (30) rotates around the roller shaft (20), the adsorption surface (101) is used to adsorb the tab, and the support surface (102) is used to assist in supporting the tab.

2. The roller mechanism according to claim 1, characterized in that: The anti-ear folding structure (10) comprises a shell (11), the shell (11) is provided with a negative pressure chamber (12), the adsorption surface (101) is provided with an adsorption hole (13), and the negative pressure chamber (12) is connected to the external atmosphere through the adsorption hole (13).

3. The roller mechanism according to claim 2, characterized in that: The number of the adsorption holes (13) is multiple, and the multiple adsorption holes (13) are arranged at intervals on the adsorption surface (101).

4. The roller mechanism according to claim 2, characterized in that: The number of the adsorption holes (13) is multiple, and the density of the multiple adsorption holes (13) decreases along the adsorption surface (101) from a side away from the support surface (102) to a side close to the support surface (102); and / or, The negative pressure chamber (12) is an arc-shaped hollow chamber, and the radial dimension of the arc-shaped hollow chamber along the shell (11) decreases from a side away from the support surface (102) to a side close to the support surface (102).

5. The roller mechanism according to claim 2, characterized in that: The shell (11) is also provided with a negative pressure hole (14), the negative pressure hole (14) is in communication with the negative pressure chamber (12) and is used for connecting a negative pressure tube.

6. The roller mechanism according to claim 1, characterized in that: At least parts of the adsorption surface (101) and the support surface (102) are arranged to be inclined upward.

7. The roller mechanism according to claim 1, characterized in that: The support surface (102) gradually bulges relative to the surface of the roller body in a circumferential direction away from the adsorption surface (101).

8. The roller mechanism according to claim 2, characterized in that: The shell (11) is provided with a hollow portion (15), the hollow portion (15) and the negative pressure chamber (12) are separated by a partition (18), and the hollow portion (15) extends along the axial direction of the shell (11).

9. The roller mechanism according to claim 2, characterized in that: The anti-pole ear folding structure (10) is also provided with a fixing portion (16), the fixing portion (16) being arranged on a side of the shell (11) away from the adsorption surface (101) and the support surface (102), and the fixing portion (16) being fixedly connected to the roller shaft (20).

10. The roller mechanism according to claim 9, characterized in that: The fixing portion (16) is provided with a mounting hole (17), and the mounting hole (17) is used to pass a fastener so as to fix the anti-polar ear folding structure (10) to the roller shaft (20).

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