Winding needle structure, winding mechanism and winding core winding equipment

Abstract

The utility model discloses a winding needle structure, a winding mechanism and winding core winding equipment, and relates to the technical field of winding mechanisms, the winding needle structure is provided with a mounting surface, a mounting groove extending in the axial direction of the winding needle structure is formed in the mounting surface, the mounting groove is at least used for allowing a movable needle mounting base to be embedded and mounted, and the mounting surface is further provided with a first weight reduction groove; and a partition part is arranged between the notch of the first weight reduction groove and the mounting groove. According to the technical scheme, the first weight reduction groove is formed, the weight of the winding needle structure can be reduced, meanwhile, the partition part is arranged in the first weight reduction groove, chippings generated by movement of the guide movable part on the side wall of the movable needle mounting base can be prevented from reaching the mounting face through the first weight reduction groove, and the service life of the winding needle structure is prolonged. And the probability that the core rolling workpiece clamped by the movable clamping needle is in contact with the chippings to cause badness is reduced.

Description

Technical Field

[0001] This application relates to the technical field of winding mechanisms, and in particular to a winding needle structure, a winding mechanism, and a core winding device. Background Art

[0002] The winding process of existing battery cells is generally completed by a winding mechanism. Traditional winding mechanisms generally include a moving needle mounting seat, a movable clamping needle for clamping the end of the core, and a winding needle for winding the core. The moving needle mounting seat extends into the mounting groove of the winding needle. Since the winding needle usually needs to have a certain winding circumference, generally, the radial dimension of the winding needle is relatively large, resulting in a relatively heavy overall mass of the winding needle, which is not conducive to the installation of the winding needle and the maintenance of its own parallelism. Summary of the Utility Model

[0003] In view of the defects existing in the traditional winding mechanism, technicians proposed a winding needle with a weight-reducing groove. By setting a weight-reducing groove on the mounting surface of the winding needle, the purpose of reducing the weight of the winding needle is achieved, making the winding needle easy to install and easy to maintain its own parallelism. At the same time, in order to ensure that the movable clamping needle moves radially as a whole to clamp the end of the core, a guiding movable part that moves radially is also exposed on the side wall of the moving needle mounting seat to provide guidance for the movable clamping needle in the radial direction. However, in the process of use, how to prevent the debris generated by the guiding movable part from reaching the mounting surface through the weight-reducing groove has become an urgent problem to be solved.

[0004] In view of this, the main purpose of this application is to propose a winding needle structure, a winding mechanism, and a core winding device, aiming to alleviate the problem that the debris generated by the guiding movable part reaches the mounting surface through the weight-reducing groove during the movement of the movable clamping needle, thereby affecting the yield rate of the core workpiece.

[0005] In a first aspect, the winding needle structure proposed in this application has a mounting surface, and an installation groove extending along the axial direction of the winding needle structure is formed on the mounting surface. The installation groove is at least used for the moving needle mounting seat to be embedded and installed, and a first weight-reducing groove is also provided on the mounting surface;

[0006] Wherein, a partition part is provided between the notch of the first weight-reducing groove and the installation groove.

[0007] In the technical solution provided by this application, since the first weight-reducing groove is arranged on the installation surface, it can ensure that the winding arc surface of the coiling needle structure is not affected. At the same time, the overall mass of the coiling needle structure is reduced, which can reduce the bearing pressure of the moving needle mounting seat. At the same time, it can also reduce the difficulty of installing the coiling needle structure onto the moving needle mounting seat, which is beneficial to maintaining the parallelism of the coiling needle structure after long-term use. At the same time, due to the arrangement of the partition portion, the channel connecting the side of the installation groove to its notch through the first weight-reducing groove is blocked. After the movable needle clamping on the moving needle mounting seat moves for a long time, the debris generated by the wear of its guiding and moving portion is difficult to leak out of the installation surface through this channel, that is, it is difficult to reach the core workpiece clamped by the movable needle, which is beneficial to improving the yield rate of the core workpiece.

[0008] In some embodiments, the partition portion is formed at the junction of the first weight-reducing groove and the installation groove.

[0009] Among them, by forming the partition portion at the junction of the first weight-reducing groove and the installation groove, the entire first weight-reducing groove can be completely exposed towards the installation surface. Thus, when machining the first weight-reducing groove and the installation groove, whether by milling or casting, the machining difficulty can be reduced and the machining efficiency can be improved.

[0010] In some embodiments, the first weight-reducing groove includes two weight-reducing groove segments located on both sides of the installation groove, and the partition portion is provided in each of the weight-reducing groove segments.

[0011] Among them, by respectively arranging the partition portions in the two weight-reducing groove segments on both sides of the installation groove, the debris generated by the guiding and moving on the moving needle mounting seat can be blocked from both sides of the installation groove, thereby reducing the influence of the debris on the yield rate of the core workpiece to a greater extent.

[0012] In some embodiments, a plurality of the first weight-reducing grooves are provided and arranged at intervals along the axial direction of the coiling needle structure. The plurality of first weight-reducing grooves include two end weight-reducing grooves, and the two end weight-reducing grooves are respectively arranged at both ends of the coiling needle structure in the axial direction.

[0013] Among them, by providing a plurality of the first weight-reducing grooves, at least the weight of the coiling needle structure can be further reduced, and the solid structure between adjacent two first weight-reducing grooves can play a role in increasing the overall strength of the coiling needle structure.

[0014] In some embodiments, a plurality of second weight-reducing grooves are arranged at intervals along the axial direction of the coiling needle structure between the two end weight-reducing grooves.

[0015] Among them, multiple second weight-reducing grooves are arranged between the two end weight-reducing grooves, so that the maximum weight reduction can be achieved on the installation surface; at the same time, since the multiple second weight-reducing grooves are arranged at intervals, the solid structure between two adjacent second weight-reducing grooves can increase the overall strength of the winding needle structure.

[0016] In some embodiments, the winding needle structure has a plurality of spacer ribs arranged at intervals along its axial direction, and the first weight-reducing groove and the second weight-reducing groove are formed between two corresponding spacer ribs;

[0017] The installation groove is arranged through a plurality of the partition ribs;

[0018] Wherein, at least a portion of the partition ribs are formed with a connecting hole communicating with the mounting groove and the winding arc surface of the winding needle structure.

[0019] Among them, since multiple partition ribs are arranged at intervals in the axial direction, the winding arc surface of the winding needle structure can obtain sufficient support strength at each axial position, preventing the winding arc surface from being locally concave after long-term winding and pressure, thereby ensuring the forming quality of the winding core workpiece; not only that, the partition rib part, as a solid structure within the winding needle structure, also plays a role in connecting with the moving needle mounting seat in the mounting groove.

[0020] In some embodiments, the plurality of connection holes include a first connection hole, and the first connection hole is arranged through the side wall of the mounting groove; and / or,

[0021] The plurality of connection holes include a second connection hole, and the second connection hole is arranged through the bottom wall of the installation groove.

[0022] Among them, combined with the specific appearance of the moving needle mounting seat, the side wall of the moving needle mounting seat can be used as a connection base to connect the winding needle structure through the first connecting hole, and the bottom wall of the moving needle mounting seat can be used as a connection base to connect the winding needle structure through the second connecting hole, which can ensure a stable connection between the winding needle structure and the moving needle mounting seat.

[0023] In some embodiments, a clearance slot is formed on the winding arc surface of the winding needle structure, and the clearance slot is arranged along the axial direction of the winding needle structure to the end of the winding needle structure.

[0024] Among them, the clearance slot is axially penetrated to the end of the winding needle structure, so that the external core unloading mechanism can extend from the end of the winding needle structure into the clearance slot to clamp the wound core workpiece, thereby facilitating the winding needle structure to withdraw the core workpiece and preventing the occurrence of an axial core problem caused by friction between the winding needle structure and the core workpiece.

[0025] In the second aspect, the winding mechanism proposed in this application includes:

[0026] An installation structure is formed with two mounting seats, at least one of the mounting seats being set as a movable needle mounting seat. An active clamping needle is mounted on the movable needle mounting seat, and a guiding and movable part is exposed on the side wall of the movable needle mounting seat. The guiding and movable part is connected to the active clamping needle; and,

[0027] Two winding needles are respectively mounted on the two mounting seats. The winding needle corresponding to the movable needle mounting seat includes the winding needle structure as described in any one of the above, and the first weight-reducing groove of the winding needle structure is arranged corresponding to the guiding and movable part.

[0028] Wherein, by being adaptively arranged in the guiding hole through a guiding roller, the resistance generated during the movement of the guiding and movable part can be reduced by means of rolling friction, so that the protrusion and retraction movements of the active clamping needle are smoother, and the probability of jamming between the active clamping needle and the movable needle mounting seat is reduced.

[0029] In some embodiments, a guiding hole is arranged on the side wall of the movable needle mounting seat, and the guiding hole is inclined in the radial direction of the active clamping needle;

[0030] The guiding and movable part includes a guiding roller rotatably arranged on the active clamping needle, and the guiding roller is adaptively arranged in the guiding hole.

[0031] Wherein, by being adaptively arranged in the guiding hole through a guiding roller, the resistance generated during the movement of the guiding and movable part can be reduced by means of rolling friction, so that the protrusion and retraction movements of the active clamping needle are smoother, and the probability of jamming between the active clamping needle and the movable needle mounting seat is reduced.

[0032] In a third direction, the core winding device proposed in the present application includes the winding mechanism as described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic structural diagram of an embodiment of the winding needle structure provided by the present application;

[0035] Figure 2 For Figure 1 the top view structural diagram of the winding needle structure in

[0036] Figure 3 For Figure 1Schematic diagram of the side view of the middle coil needle structure.

[0037] Description of Figure Numbers:

[0038] 100. Winding needle structure; 1. Mounting surface; 11. Mounting groove; 12. First weight-reducing groove; 12a. Weight-reducing groove section; 121. End weight-reducing groove; 13. Second weight-reducing groove; 14. Spacer rib portion; 15. Connecting hole; 151. First connecting hole; 152. Second connecting hole; 2. Winding arc surface; 21. Make way slot; 3. Partition portion.

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0046] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present 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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0048] The winding process of the existing battery cells is generally completed by a winding mechanism. The traditional winding mechanism generally includes a moving needle mounting seat, a movable clamping needle for clamping the end of the winding core, and a winding needle for winding the winding core. The moving needle mounting seat extends into the mounting groove of the winding needle, and the movable clamping needle is movably arranged along the radial direction on the moving needle mounting seat. Since the winding needle usually needs to have a certain winding circumference, generally, the radial dimension of the winding needle is relatively large, resulting in a relatively heavy overall mass of the winding needle, which is not conducive to the installation of the winding needle and maintaining its own parallelism.

[0049] In view of the defects existing in the traditional winding mechanism, technicians proposed a winding needle with a weight-reducing groove. By setting a weight-reducing groove on the mounting surface of the winding needle, the purpose of reducing the weight of the winding needle is achieved, making the winding needle easy to install and easy to maintain its own parallelism. At the same time, in order to ensure that the movable clamping needle moves integrally along the radial direction to clamp the end of the winding core, a guiding movable part that moves along the radial direction is also exposed on the side wall of the moving needle mounting seat to provide guidance for the movable clamping needle in the radial direction. However, during the process of the movable clamping needle clamping and releasing the end of the winding core, the guiding movable part is worn, and the debris generated by the wear is very easy to reach the weight-reducing groove through the mounting groove from the side of the moving needle mounting seat, that is, leak out of the mounting surface and reach the winding core workpiece, thus affecting the yield rate of the winding core workpiece.

[0050] Analyzing the causes of the above problems, it can be seen that the leakage of debris occurs after the weight-reducing groove is set. How to balance the problem of debris exposure and the problem of the over-weight of the winding needle will directly affect the overall effect of the winding needle structure.

[0051] In view of this, the main purpose of the present application is to propose a winding needle structure, a winding mechanism and a core winding device. The usage scenarios of the winding needle structure, the winding mechanism and the core winding device mainly include the winding process of battery cores. When the winding needle structure, the winding mechanism and the winding device are applied to the winding process scenario of battery cores, it can at least alleviate the problem that the debris generated by the guiding and moving part during the movement of the movable clamping needle reaches the mounting surface through the weight-reducing groove, thereby affecting the yield rate of the core workpiece.

[0052] Among them, Figure 1 is a schematic structural diagram of an embodiment of the winding needle structure provided by the present application; Figure 2 is Figure 1 the top view structural diagram of the winding needle structure in Figure 3 is Figure 1 the side view structural diagram of the winding needle structure in

[0053] In an embodiment of the present application, the winding mechanism includes a mounting structure and two winding needles. The mounting structure is formed with two mounting seats, and at least one of the mounting seats is set as a movable needle mounting seat. A movable clamping needle is mounted on the movable needle mounting seat, and a guiding and moving part is exposed on the side wall of the movable needle mounting seat. The guiding and moving part is connected to the movable clamping needle; the two winding needles are respectively mounted on the two mounting seats. The winding needle corresponding to the movable needle mounting seat includes a winding needle structure 100, and the first weight-reducing groove 12 of the winding needle structure 100 is arranged corresponding to the guiding and moving part.

[0054] It should be noted that in the winding operation of the core, the winding mechanism is usually also referred to as a turret. In the winding mechanism, two winding needles usually exist in pairs to form a winding needle group around which the core can be wound on its circumferential side. There are various ways to name the winding needles in the art. For example, there is also a naming method in which one winding needle is named the inner needle and the other winding needle is named the outer needle. However, no matter what naming method is used, it does not affect the understanding of the winding needle concept of this application by those skilled in the art. The two winding needles are usually installed radially opposite on two mounting seats, and a clamping gap is usually formed between their mounting surfaces 1. The movable clamping needle can protrude radially into the clamping gap to clamp the end of the core workpiece extending into it. The movable needle mounting seat is for the movable clamping needle. In the process of clamping the end of the core workpiece, the end of the core workpiece can be clamped by setting a single movable clamping needle close to another mounting seat, or the core workpiece can be clamped by setting two movable clamping needles close to each other. If the former scheme is adopted, then only one of the mounting seats needs to be set as the movable needle mounting seat, and at the same time, only one of the winding needles needs to be set as the winding needle structure 100, and the other winding needle can have other types of structures. If the latter scheme is adopted, then both mounting seats should be set as movable needle mounting seats, and at the same time, both winding needles should be set as the winding needle structure 100.

[0055] It should be noted that a receiving groove is usually formed on the movable needle mounting seat and extends axially. The movable clamping needle can move in the receiving groove to have a release position where it retracts into the receiving groove and a clamping position where it protrudes from the receiving groove. The switching of the movable clamping needle between the two positions is realized by the guiding movement of the guiding movable part on the side wall of the movable needle mounting seat. There are many structural types of the guiding movable part. For example, the guiding movable part can be a guiding slider that moves in a guiding hole on the side wall of the movable needle mounting seat. However, no matter what structural type it is, it can be understood that the movement of the guiding movable part is prone to wear, and the specific type of the guiding slider is not limited in this embodiment. The driving force source of the movement of the movable clamping needle can be axial. Under the guiding action of the guiding movable part, the movable clamping needle offsets radially to reach the clamping position. The driving force source of the movement of the movable clamping needle can also be radial. Under the guiding action of the guiding movable part, it can be ensured that the movable clamping needle at the distal end in the axial direction can also offset radially with the whole to reach the clamping position.

[0056] Regarding the winding needle structure 100, please refer to Figures 1 to 3 , in some embodiments, the winding needle structure 100 has a mounting surface 1, and an installation groove 11 extending axially is formed on the mounting surface 1. The installation groove 11 is at least used for the movable needle mounting seat to be embedded and installed. A first weight-reducing groove 12 is also provided on the mounting surface 1. Among them, a partition part 3 is provided between the notch of the first weight-reducing groove 12 and the installation groove 1.

[0057] It should be noted that in the radial direction of the winding needle structure 100, the winding needle structure 100 generally has an arc-shaped winding arc surface 2 and a mounting surface 1 corresponding to the winding arc surface 2. The mounting groove 11 and the first weight-reducing groove 12 are both formed on the mounting surface 1. After the moving needle mounting seat is embedded in the mounting groove 11 to connect the winding needle structure 100, the guiding and movable part on the side wall of the moving needle mounting seat is exposed on the side of the mounting groove 11. The setting position of the first weight-reducing groove 12 in this technical solution corresponds to the exposed position of the guiding and movable part; at the same time, a partition part 3 is provided between the notch of the first weight-reducing groove 12 and the mounting groove 1, and its function is to prevent debris in the mounting groove 11 from reaching the mounting surface 1 through the first weight-reducing groove 12. The partition part 3 can extend at least to the two opposite side walls of the first weight-reducing groove 12 along the axial two ends of the winding needle structure 100. One end of the partition part 3 along the radial direction needs to extend at least to the bottom wall of the first weight-reducing groove 12, and the other end needs to extend at least to the side line of the notch of the first weight-reducing groove 12 close to the mounting groove 11, so as to achieve the purpose of blocking; the partition part 3 can be formed in the first weight-reducing groove 12 by welding, or can be reserved when the first weight-reducing groove 12 is processed, that is, the partition part 3 is integrally provided with the winding needle structure 100.

[0058] In the technical solution provided by the present application, since the first weight-reducing groove 12 is provided on the mounting surface 1, it can ensure that the winding arc surface 21 of the winding needle structure 100 is not affected. At the same time, the overall quality of the winding needle structure 100 is reduced, which can reduce the bearing pressure of the moving needle mounting seat, and at the same time can also reduce the difficulty of installing the winding needle structure 100 to the moving needle mounting seat, which is beneficial to maintaining the parallelism of the winding needle structure 100 after long-term use; at the same time, due to the setting of the partition part 3, the channel connecting the side of the mounting groove 11 to its notch through the first weight-reducing groove 12 is blocked. After the movable needle clamping on the moving needle mounting seat moves for a long time, the debris generated by the wear of its guiding and movable part is difficult to leak out of the mounting surface 1 through this channel, that is, it is difficult to reach the core workpiece clamped by the movable needle clamping, which is beneficial to improving the yield rate of the core workpiece; not only that, also due to the setting of the partition part 3, the core workpiece cannot enter the guiding and movable part through the first weight-reducing groove 12, so as not to cause the guiding and movable part to be stuck, and also relieve the problem of poor needle pulling.

[0059] In the above-mentioned embodiment, the setting position state of the partition part 3 has been explained, that is, one end of the partition part 3 close to the mounting surface 1 needs to extend to the side line of the notch of the first weight-reducing groove 12 on the mounting surface 1 close to the mounting groove 11, and there can be various situations for the setting position of the end of the partition part 3 far from the mounting surface 1. For example, in some embodiments, the partition part 3 is formed at the junction of the first weight-reducing groove 12 and the mounting groove 1.

[0060] It should be noted that the statement "the partition portion 3 is formed at the junction of the first weight reduction groove 12 and the installation groove 11" means that the partition portion 3 separates the first weight reduction groove 12 and the installation groove 11. Generally, it can be understood that part of the side wall of the installation groove 11 is formed on the partition portion 3, and the partition portion 3 is arranged vertically relative to the installation surface 1.

[0061] According to the above technical solution, by forming the partition portion 3 at the junction of the first weight reduction groove 12 and the installation groove 11, the entire first weight reduction groove 12 can be completely exposed towards the installation surface 1. Thus, when machining the first weight reduction groove 12 and the installation groove 11, whether by milling or casting, the machining difficulty can be reduced and the machining efficiency can be improved.

[0062] In comparison, in some other embodiments, the partition portion 3 is arranged at an angle to the installation surface 1. This arrangement causes the first weight reduction groove 12 to be divided by the partition portion 3 into a section that is laterally connected to the installation groove 11 and a section that is exposed towards the installation surface 1. It is easy to understand that in this solution, when machining the first weight reduction groove 12, it is also necessary to machine it in sections, which will undoubtedly increase the machining difficulty.

[0063] Please refer to Figure 1 and Figure 2 , in some embodiments, the first weight reduction groove 12 includes two weight reduction groove segments 12a located on both sides of the installation groove 11, and a partition portion 3 is provided in each weight reduction groove segment 12a.

[0064] It should be noted that the first weight reduction groove 12 includes two weight reduction groove segments 12a located on both sides of the installation groove 11. It can be understood that the first weight reduction groove 12 extends along the circumferential direction of the winding needle structure 100, and the bottom wall of the first weight reduction groove 12 extends along the winding arc surface 2 of the winding needle structure 100 to retain a certain thickness of the solid structure. If not interfered by other structural features, the cross-section of the first weight reduction groove 12 along the axial direction is in a semi-circular cross-section. However, usually, other features will also be provided on the winding arc surface 2 of the winding needle structure 100. Therefore, the cross-section of the first weight reduction groove 12 along the axial direction generally includes a combination of a partial fan-shaped area and a special-shaped area (the area corresponding to the features on the winding arc surface 2); generally speaking, the installation groove 11 is usually arranged on the central axis of the installation surface 1, so as to ensure that when the winding needle structure 100 rotates with the moving needle mounting seat, its winding arc surface 2 maintains a concentric rotation state.

[0065] According to the above technical solution, by respectively arranging the partition portion 3 in the two weight reduction groove segments 12a on both sides of the installation groove 11, the debris generated by the guiding movement on the moving needle mounting seat can be blocked from both sides of the installation groove 11, thereby reducing the impact of the debris on the yield rate of the core workpiece to a greater extent.

[0066] In some other embodiments, a plurality of first weight reduction grooves 12 are provided and arranged at intervals along the axial direction of the needle winding structure 100. The plurality of first weight reduction grooves 12 include two end weight reduction grooves 121, and the two end weight reduction grooves 121 are respectively arranged at both ends in the axial direction of the needle winding structure 100.

[0067] It should be noted that the guiding and moving part is provided to provide radial guidance for the movable needle holder. At the same time, the movable needle holder as a whole is an elongated structure extending along the axial direction. Therefore, usually a plurality of guiding and moving parts need to be provided to provide synchronous radial guidance for its respective local positions. Since the setting of the first weight reduction groove 12 corresponds to the guiding and moving part exposed on the side wall of the movable needle seat, the number of the first weight reduction grooves 12 in this embodiment is set to be plural; the end weight reduction groove 121 refers to the first weight reduction groove 12 near the axial end of the needle winding structure 100. In combination with the winding mechanism, usually guiding and moving parts are selected to be arranged at both axial ends of the movable needle seat, so that the axial ends of the movable needle holder can be guided simultaneously, thereby realizing overall radial translation. In this way, the number of the guiding and moving parts required is the least; the plurality of first weight reduction grooves 12 are arranged at intervals, which means that there is a solid structure between two adjacent first weight reduction grooves 12.

[0068] According to the above technical solution, setting a plurality of first weight reduction grooves 12 can at least further reduce the weight of the needle winding structure 100, and the solid structure between two adjacent first weight reduction grooves 12 can play a role in increasing the overall strength of the needle winding structure 100.

[0069] Further, in some embodiments, a plurality of second weight reduction grooves 13 are arranged at intervals along the axial direction of the needle winding structure 100 between the two end weight reduction grooves 121.

[0070] It should be noted that the set size of the guiding and moving part is small relative to the overall axial size of the movable needle seat. Therefore, the axial size of the corresponding first weight reduction groove 12 is small, and there are still relatively many solid areas on the mounting surface 1 of the needle winding structure 100. In principle, these solid areas can all be subjected to weight reduction treatment; the plurality of second weight reduction grooves 13 are arranged at intervals, which means that there is a solid structure between two adjacent second weight reduction grooves 13.

[0071] According to the above technical solution, arranging a plurality of second weight reduction grooves 13 between the two end weight reduction grooves 121 can make a maximized weight reduction treatment on the mounting surface 1; at the same time, since the plurality of second weight reduction grooves 13 are arranged at intervals, the solid structure between two adjacent second weight reduction grooves 13 can play a role in increasing the overall strength of the needle winding structure 100.

[0072] It should be noted that the overall of the first weight reduction groove 12 and the second weight reduction groove 13 are arranged axially on the winding needle structure 100, and the shapes of the two weight reduction grooves can be set to be the same. For example, please refer to Figure 2 , the difference in the displacement of the two is the difference in the setting position. The first weight reduction groove 12 needs to be set corresponding to the exposed guiding and moving part on the moving needle mounting seat.

[0073] Please refer to Figure 1 and Figure 2 , the winding needle structure 100 has a plurality of partition ribs 14 arranged at intervals along its axis. The first weight reduction groove 12 and the second weight reduction groove 13 are formed between two corresponding partition ribs 14; the mounting groove 11 runs through a plurality of partition ribs 14; among them, connection holes 15 communicating the mounting groove 11 with the winding arc surface 2 of the winding needle structure 100 are formed on at least part of the partition ribs 14.

[0074] It should be noted that since the middle-end weight reduction groove 121 of the first weight reduction groove 12 is also formed between two corresponding partition ribs 14, it can be understood that the axial end of the winding needle structure 100 is composed of two partition ribs 14 at the end; the partition ribs 14 are an indispensable structure in the winding needle structure 100, and their functions are to support the winding arc surface 2 of the winding needle structure 100 and to be connected to the moving needle mounting seat; "connection holes 15 communicating the mounting groove 11 with the winding arc surface 2 of the winding needle structure 100 are formed on at least part of the partition ribs 14" means that connection holes 15 can be formed on one of the partition ribs 14, or connection holes 15 can be formed on multiple of the partition ribs 14, or even connection holes 15 can be formed on all of the partition ribs 14; at the same time, there are various possibilities for the extending direction of the connection holes 15, as long as both ends of them communicate with the winding arc surface 2 and the mounting groove 11 respectively; the main function of the connection holes 15 is to allow connection bolts or other connecting parts to pass through to be connected to the moving needle mounting seat.

[0075] According to the above technical solution, since a plurality of partition ribs 14 are arranged at intervals axially, the winding arc surface 2 of the winding needle structure 100 can obtain sufficient support strength at each axial position, preventing the situation that the winding arc surface 2 is locally concave after being wound and pressed for a long time, and ensuring the forming quality of the core workpiece; moreover, as a solid structure in the winding needle structure 100, the partition ribs 14 also play a role in connecting with the moving needle mounting seat in the mounting groove 11, ensuring the stable connection between the winding needle structure 100 and the moving needle mounting seat.

[0076] Specifically, please refer to Figure 1 and Figure 2In some embodiments, the plurality of connection holes 15 include a first connection hole 151, which passes through a side wall of the mounting groove 11; and / or the plurality of connection holes 15 include a second connection hole 152, which passes through a bottom wall of the mounting groove 11.

[0077] It should be noted that the above two parallel technical solutions "multiple connection holes 15 include a first connection hole 151, and the first connection hole 151 passes through the side wall of the installation groove 11" and "multiple connection holes 15 include a second connection hole 152, and the second connection hole 152 passes through the bottom wall of the installation groove 11" can be set one by one or at the same time. Obviously, the effect of setting them at the same time is better.

[0078] According to the above technical solution, combined with the specific appearance of the moving needle mounting seat, the side wall of the moving needle mounting seat can be used as a connection base to connect the winding needle structure 100 through the first connecting hole 151, and the bottom wall of the moving needle mounting seat can be used as a connection base to connect the winding needle structure 100 through the second connecting hole 152, thereby ensuring a stable connection between the winding needle structure 100 and the moving needle mounting seat.

[0079] When the two winding needles of the winding mechanism have finished winding the core workpiece, it is still necessary to unload the core workpiece. Directly axially away from the winding needle may cause the core to pull out. In view of this, please refer to Figure 1 and Figure 3 In some embodiments, a clearance slot 21 is formed on the winding arc surface 2 of the winding needle structure 100 , and the clearance slot 21 is arranged along the axial direction of the winding needle structure 100 to the end of the winding needle structure 100 .

[0080] It should be noted that the clearance slot 21 is arranged on the winding arc surface 2 of the winding needle structure 100, and it usually has a certain depth in the radial direction. Both the first weight reduction groove 12 and its weight reduction groove need to consider the cross-sectional shape of the clearance slot 21 and make corresponding clearance processing.

[0081] According to the above technical solution, the clearance slot 21 is axially extended to the end of the winding needle structure 100, so that the external winding core unloading mechanism can extend from the end of the winding needle structure 100 into the clearance slot 21 to clamp the wound core workpiece, thereby facilitating the winding needle structure 100 to withdraw the winding core workpiece, and preventing the occurrence of an axial core problem caused by friction between the winding needle structure 100 and the winding core workpiece.

[0082] The above-mentioned winding mechanism does not limit the specific structural type of the guiding movable part. In some embodiments, a guide hole is provided on the side wall of the movable needle mounting seat, and the guide hole is inclined in the radial direction of the movable clamping needle; the guiding movable part includes a guide roller rotatably arranged on the movable clamping needle, and the guide roller is adapted to be arranged in the guide hole.

[0083] It should be noted that the rotation axis of the guiding roller extends towards the side of the installation groove 11, and the guiding roller is adaptively arranged in the guiding hole, so that it can roll along the extension stroke of the guiding hole. At the same time, the inclination of the guiding hole in the radial direction causes the axial movement of the movable clamping needle to be converted into a radial offset, so that the retraction and protrusion activities relative to the movable needle mounting seat can be realized.

[0084] According to the above technical solution, by adaptively arranging the guiding roller in the guiding hole, the resistance generated during the movement of the guiding movable part can be reduced by means of rolling friction, so that the protrusion and retraction activities of the movable clamping needle are smoother, and the probability of jamming between the movable clamping needle and the movable needle mounting seat is reduced.

[0085] Please continue to refer to Figures 1 to 3 , this application also proposes a core winding device, and the core winding device includes a winding mechanism. The specific structure of the winding mechanism refers to the above-mentioned embodiment. Since this core winding device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one. Among them, this core winding device is mainly used to wind a flat battery cell workpiece into a wound core workpiece.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit it; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered by the scope of the claims and the description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A needle winding structure, characterized in that: The needle winding structure has a mounting surface, on which a mounting groove extending along the axial direction of the needle winding structure is formed, the mounting groove is at least used for embedding and mounting the movable needle mounting seat, and a first weight-reducing groove is also provided on the mounting surface; Wherein, a partition portion is provided between the notch of the first weight-reducing groove and the installation groove.

2. The needle winding structure according to claim 1, characterized in that: The partition portion is formed at a junction of the first weight-reducing groove and the mounting groove.

3. The needle winding structure according to claim 1, characterized in that: The first weight-reducing groove comprises two weight-reducing groove sections located on both sides of the installation groove, and the partition part is arranged in each of the weight-reducing groove sections.

4. The needle winding structure according to claim 1, characterized in that: A plurality of the first weight-reducing grooves are provided and are spaced apart along the axial direction of the winding needle structure. The plurality of the first weight-reducing grooves include two end weight-reducing grooves, and the two end weight-reducing grooves are respectively provided at two ends of the winding needle structure in the axial direction.

5. The needle winding structure according to claim 4, characterized in that: A plurality of second weight-reducing grooves are arranged between the two end weight-reducing grooves and are spaced apart along the axial direction of the winding needle structure.

6. The needle winding structure according to claim 5, characterized in that: The winding needle structure has a plurality of spacer ribs arranged at intervals along its axial direction, and the first weight-reducing groove and the second weight-reducing groove are formed between two corresponding spacer ribs; The installation groove is arranged through a plurality of the partition ribs; Wherein, at least a portion of the partition ribs are formed with a connecting hole communicating with the mounting groove and the winding arc surface of the winding needle structure.

7. The needle winding structure according to claim 6, characterized in that: The plurality of connection holes include a first connection hole, and the first connection hole is arranged through the side wall of the mounting groove; and / or, The plurality of connection holes include a second connection hole, and the second connection hole is arranged through the bottom wall of the installation groove.

8. The needle winding structure according to any one of claims 1 to 7, characterized in that: A clearance slot is formed on the winding arc surface of the winding needle structure, and the clearance slot is arranged along the axial direction of the winding needle structure and extends to the end of the winding needle structure.

9. A winding mechanism, characterized in that: include: The mounting structure is formed with two mounting seats, at least one of which is configured as a movable needle mounting seat, a movable clamping needle is mounted on the movable needle mounting seat, a guide movable portion is exposed on the side wall of the movable needle mounting seat, and the guide movable portion is connected to the movable clamping needle; and Two winding needles are respectively mounted on the two mounting seats, and the winding needle corresponding to the movable needle mounting seat includes a winding needle structure as described in any one of claims 1 to 8, and a first weight-reducing groove of the winding needle structure is arranged corresponding to the guide movable part.

10. The winding mechanism according to claim 9, characterized in that: A guide hole is provided on the side wall of the movable needle mounting seat, and the guide hole is inclined in the radial direction of the movable clamping needle; The guide movable part comprises a guide roller rotatably arranged on the movable clamping needle, and the guide roller is adapted to be arranged on the guide hole.

11. A core winding device, characterized in that: Comprising the winding mechanism as claimed in claim 9 or 10.

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