Needle winding mechanism and battery cell winding machine

Abstract

The present invention relates to the technical field of battery production equipment, and in particular to a needle winding mechanism and a battery cell winding machine. The needle winding mechanism provided by the present invention comprises a linear drive mechanism, a pair of needle seats, a pair of inner needle assemblies, a pair of outer needle assemblies and a pair of push rod assemblies; wherein, the linear drive mechanism is transmission-connected to the pair of needle seats; the pair of push rod assemblies are respectively arranged on the outside of the pair of needle seats, and the push rod assemblies and the needle seats can slide together along a first direction; the pair of inner needle assemblies are respectively arranged on the inside of the pair of needle seats, and a first guide structure is provided between the inner needle assembly and the push rod assembly, and a first connecting rod is provided between the inner needle assembly and the needle seat; the pair of outer needle assemblies are respectively arranged on the outside of the pair of push rod assemblies; a second guide structure is provided between the outer needle assembly and the push rod assembly, and a second connecting rod is provided between the outer needle assembly and the needle seat. The needle winding mechanism and the battery cell winding machine provided by the present invention can solve or improve the technical problems of the complex structure and high cost of the needle winding mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production equipment, and in particular to a winding needle mechanism and a battery cell winding machine. Background Art

[0002] During lithium battery production, a cell winding machine uses a winding needle mechanism to wind the positive and negative electrode sheets and separator to form a battery cell. The outer circumference of the winding needle mechanism is related to the alignment of the electrode sheets and tabs and the size of the battery cell, and the outer circumference of the winding needle mechanism directly affects the quality of the battery cell.

[0003] In related art, the needle winding mechanism uses a wedge structure or a sliding groove structure to adjust the inner and outer needles simultaneously. The needle winding mechanism is equipped with a linear motion mechanism, which is located inside the needle winding mechanism and is specifically used to adjust the outer circumference of the needle winding mechanism. The extension and retraction of the needle winding mechanism is driven by another linear motion mechanism. This results in a complex structure and high cost for the needle winding mechanism. Summary of the Invention

[0004] In view of this, the present invention provides a winding needle mechanism and a battery cell winding machine, which can solve or improve the technical problems of complex structure and high cost of the winding needle mechanism.

[0005] In a first aspect, the present invention provides a needle winding mechanism, comprising a linear drive mechanism, a pair of needle seats, a pair of inner needle assemblies, a pair of outer needle assemblies, and a pair of push rod assemblies; wherein,

[0006] The linear drive mechanism is in driving connection with the pair of needle seats, and the linear drive mechanism is suitable for driving the pair of needle seats to move along a first direction;

[0007] A pair of push rod assemblies are respectively arranged on the outer sides of a pair of needle seats, and the push rod assemblies and the needle seats can be slidably matched along the first direction;

[0008] A pair of inner needle assemblies are respectively arranged on the inner sides of a pair of needle seats, a gap between the pair of inner needle assemblies is used to clamp a septum, and a first guide structure is provided between the inner needle assembly and the push rod assembly, the first guide structure is suitable for guiding the inner needle assembly to move along a second direction, the second direction is perpendicular to the first direction, a first connecting rod is provided between the inner needle assembly and the needle seat, and both ends of the first connecting rod are hinged to the inner needle assembly and the needle seat respectively;

[0009] A pair of outer needle assemblies are respectively arranged on the outside of a pair of push rod assemblies; a second guide structure is provided between the outer needle assembly and the push rod assembly, and the second guide structure is suitable for guiding the outer needle assembly to move along the second direction; a second connecting rod is provided between the outer needle assembly and the needle seat, and the two ends of the second connecting rod are respectively hinged to the outer needle assembly and the needle seat.

[0010] Beneficial effects:

[0011] The needle winding mechanism provided by the present invention is driven by a linear drive mechanism to feed or retract along a first direction. Before winding the battery cell, when the needle winding mechanism performs the needle insertion action, the linear drive mechanism drives the needle seat to feed along the first direction, and the end of the needle seat is inserted into the external sleeve nozzle. The push rod assembly and the annular end surface of the sleeve nozzle are abutted. Then the linear drive mechanism drives the needle seat to further enter the sleeve nozzle. At this time, the push rod assembly and the needle seat generate relative displacement in the first direction. Since a first guide structure and a second guide structure are respectively provided between the push rod assembly and the inner needle assembly and the outer needle assembly, and a first connecting rod and a connecting rod are respectively provided between the needle seat and the inner needle assembly and the outer needle assembly. The second connecting rod, when the needle seat extends relative to the push rod assembly in the first direction, under the transmission action of the first connecting rod and the second connecting rod, the needle seat simultaneously drives the inner needle assembly and the outer needle assembly to move. Under the constraint action of the first guide structure and the second guide structure, the push rod assembly remains relatively stationary with the inner needle assembly and the outer needle assembly in the first direction. The inner needle assembly and the outer needle assembly can only move along the guide direction of the first guide structure and the second guide structure, that is, the second direction perpendicular to the first direction. When a pair of inner needle assemblies are relatively close to each other along the second direction, they can clamp the diaphragm, while a pair of outer needle assemblies expand outward, thereby realizing the adjustment of the outer circumference of the needle winding mechanism. Therefore, the technical solution provided by the present invention can realize the feeding and retraction of the needle winding mechanism and the adjustment of the outer circumference of the needle winding mechanism only through a linear drive mechanism, and does not require a drive device to be set inside the needle winding mechanism, thereby simplifying the structure and reducing costs.

[0012] The needle winding mechanism provided by the present invention further includes:

[0013] The return spring has two ends acting on the needle seat and the push rod assembly respectively. When the needle seat extends outward along the first direction relative to the push rod assembly, the return spring stores energy so that the needle seat has a tendency to retract along the first direction.

[0014] Beneficial effects:

[0015] When the linear drive mechanism drives the needle seat to extend and advance in a first direction, the needle seat and the push rod assembly undergo relative displacement in the first direction. At this time, the return spring elastically deforms and stores energy. When the linear drive mechanism drives the needle seat to retract, the elastic force of the return spring drives the needle seat in the retracting direction, thereby causing the outer and inner needle assemblies to return to their original positions.

[0016] According to the needle winding mechanism provided by the present invention, the push rod assembly is provided with a first elongated guide hole, and the first guide hole extends along the first direction;

[0017] The needle seat is provided with a slider, and the slider is slidably engaged with the first guide hole;

[0018] The return spring is arranged in the first guide hole, one end of the return spring abuts against the slider, and the other end abuts against the push rod assembly.

[0019] According to the needle winding mechanism provided by the present invention, the needle seat comprises a seat body and a tip portion, the tip portion is configured as a pointed structure, and the tip portion is connected to one end of the seat body;

[0020] The seat body is provided with a slide groove structure extending along the first direction, and the push rod assembly is slidably arranged inside the slide groove structure.

[0021] According to the needle winding mechanism provided by the present invention, both side walls of the slide groove structure are provided with a second long guide hole, and the second guide hole extends along the first direction;

[0022] The push rod assembly is provided with a pin shaft, and the pin shaft extends from both sides of the push rod assembly. The pin shaft extends into the second guide hole and is in sliding fit with the second guide hole.

[0023] According to the needle winding mechanism provided by the present invention, the needle seat is provided with an elongated hole extending along the first direction, and the first guiding structure passes through the elongated hole.

[0024] According to the needle winding mechanism provided by the present invention, the outer needle assembly is provided with a groove structure, the needle seat and the push rod assembly are arranged in the groove structure; the outer side surface of the outer needle assembly is provided as a semi-cylindrical surface.

[0025] According to the needle winding mechanism provided by the present invention, the first guide structure and the second guide structure are both configured as linear bearing structures.

[0026] According to the needle winding mechanism provided by the present invention, the inner needle assembly includes an inner needle plate and a clamping plate, the inner needle plate and the clamping plate are arranged correspondingly, and an elastic member is arranged between the two;

[0027] Wherein, the first guide structure is provided between the inner needle plate and the push rod assembly, a first connecting rod is provided between the inner needle plate and the needle seat, and a pair of the clamping plates are used to clamp the diaphragm.

[0028] In a second aspect, the present invention provides another needle winding mechanism, comprising a linear drive mechanism, a pair of needle seats, a pair of inner needle assemblies, a pair of outer needle assemblies, and a pair of push rod assemblies; wherein,

[0029] The linear drive mechanism is in driving connection with the pair of needle seats, and the linear drive mechanism is suitable for driving the pair of needle seats to move along a first direction;

[0030] A pair of push rod assemblies are respectively arranged on the outer sides of a pair of needle seats, and the push rod assemblies and the needle seats can be slidably matched along the first direction;

[0031] A pair of inner needle assemblies are respectively arranged on the inner sides of a pair of needle seats, a gap between the pair of inner needle assemblies is used to clamp a septum, and a first guide structure is provided between the inner needle assembly and the push rod assembly, the first guide structure is suitable for guiding the inner needle assembly to move along a second direction, the second direction is perpendicular to the first direction, a first connecting rod is provided between the inner needle assembly and the needle seat, and both ends of the first connecting rod are hinged to the inner needle assembly and the needle seat respectively;

[0032] A pair of outer needle assemblies are respectively arranged on the outside of a pair of push rod assemblies; a third guide structure is provided between the needle seat and the outer needle assembly, and the third guide structure is suitable for guiding the outer needle assembly to move along the second direction; a fourth guide structure is provided between the outer needle assembly and the push rod assembly, and the fourth guide structure is suitable for guiding the outer needle assembly to move along the third direction, and the third direction forms an acute angle with the first direction.

[0033] Beneficial effects:

[0034] The needle winding mechanism provided by the present invention is driven by a linear drive mechanism to feed or retract along a first direction. Before winding the battery cell, when the needle winding mechanism performs the needle insertion action, the linear drive mechanism drives the needle seat to feed along the first direction, and the end of the needle seat is inserted into the external nozzle. The push rod assembly abuts against the annular end surface of the nozzle, and then the linear drive mechanism drives the needle seat to further enter the nozzle. At this time, the push rod assembly and the needle seat produce a relative displacement in the first direction. Since a first guide structure is provided between the push rod assembly and the inner needle assembly, and a first connecting rod is provided between the needle seat and the inner needle assembly, when the needle seat extends along the first direction relative to the push rod assembly, under the transmission action of the first connecting rod, the needle seat drives the inner needle assembly to move. Under the constraint action of the first guide structure, the push rod assembly maintains relative to the inner needle assembly in the first direction. When the needle seat and the outer needle assembly are stationary, the inner needle assembly can only move along the guide direction of the first guide structure, that is, the second direction perpendicular to the first direction. When a pair of inner needle assemblies are relatively close to each other along the second direction, they can clamp the diaphragm. At the same time, since a third guide structure is provided between the needle seat and the outer needle assembly, the third guide structure is suitable for guiding the outer needle assembly to move along the second direction (perpendicular to the first direction). The needle seat and the outer needle assembly remain relatively stationary in the first direction, that is, the outer needle assembly extends along the first direction with the needle seat. At the same time, since a fourth guide structure is provided between the outer needle assembly and the push rod, the fourth guide structure is suitable for guiding the outer needle assembly to move along the third direction, and the third direction is at an acute angle to the first direction, that is, the outer needle assembly moves obliquely outward relative to the push rod assembly along the fourth guide structure, thereby achieving adjustment of the outer circumference. This solution can also achieve both driving the needle winding mechanism to advance and retract and adjusting the outer circumference of the needle winding mechanism through only one linear drive mechanism, and does not require a drive device to be provided inside the needle winding mechanism, thereby simplifying the structure and reducing costs.

[0035] In a third aspect, the present invention provides a battery cell winding machine comprising the winding needle mechanism described in any one of the above items.

[0036] Beneficial effects:

[0037] The battery cell winding machine provided by the present invention includes any of the aforementioned winding needle mechanisms. Therefore, the battery cell winding machine provided by the present invention can resolve or improve the technical issues of the complex and high-cost winding needle mechanisms. The derivation process for this beneficial effect is generally similar to that for the aforementioned winding needle mechanisms and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 Schematic diagram of the cross-sectional structure of the needle winding mechanism according to an embodiment of the present invention;

[0040] Figure 2 This is a structural schematic diagram of the needle seat of the needle winding mechanism in the retracted state according to an embodiment of the present invention;

[0041] Figure 3 This is a structural schematic diagram of the needle seat of the needle winding mechanism in the extended state according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the needle seat structure according to an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the push rod assembly structure according to an embodiment of the present invention;

[0044] Figure 6 This is a schematic structural diagram of an outer needle assembly according to an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of a clamping plate according to an embodiment of the present invention;

[0046] Figure 8 This is a structural schematic diagram of the needle seat of the needle winding mechanism in the retracted state according to another embodiment of the present invention;

[0047] Figure 9 This is a structural schematic diagram of the needle seat of the needle winding mechanism in the extended state according to another embodiment of the present invention.

[0048] Description of reference numerals:

[0049] Outer needle assembly; 12. Push rod assembly; 13. Needle seat; 14. Inner needle assembly; 15. Second connecting rod; 16. First connecting rod; 17. Return spring; 18. Second guide structure; 19. First guide structure; 20. Fourth guide structure; 21. Third guide structure; 111. Groove structure; 121. First guide hole; 122. Linear bearing mounting hole; 131. Seat body; 132. Tip; 133. Slide groove structure; 134. Slider; 135. Long strip hole; 136. Second guide hole; 141. Inner needle plate; 142. Clamping plate. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0051] like Figures 1 to 7 As shown, an embodiment of the present invention provides a needle winding mechanism, comprising a linear drive mechanism, a pair of needle seats 13, a pair of inner needle assemblies 14, a pair of outer needle assemblies and a pair of push rod assemblies 12;

[0052] Among them, a pair of inner needle assemblies 14 are correspondingly arranged, and a pair of needle seats 13, a pair of push rod assemblies 12 and a pair of outer needle assemblies are arranged on both sides of the pair of inner needle assemblies 14 in sequence from the inside to the outside.

[0053] In this embodiment, the linear drive mechanism is transmission-connected to a pair of needle seats 13. The linear drive mechanism is suitable for driving a pair of needle seats 13 to move along a first direction. The pair of needle seats 13 can be fixed on a base, and the base is connected to the linear drive mechanism. Specifically, the linear drive mechanism can be a linear motor, a cylinder, a hydraulic cylinder or other mechanism. The linear drive mechanism is used to drive a pair of needle seats 13 to move along a first direction. The needle seat 13 as a whole can be a long plate-like structure, and the first direction is consistent with the length direction of the needle seat 13.

[0054] A pair of push rod assemblies 12 are respectively arranged on the outside of a pair of needle hubs 13, and the push rod assemblies 12 and the needle hubs 13 can slide together along a first direction. It should be noted that the side of the needle hub 13 close to the inner needle assembly 14 is the inner side of the needle hub 13, and the side away from the inner needle assembly 14 is the outer side of the needle hub 13. The push rod assembly 12 is arranged on the outer side of the needle hub 13, that is, the inner and outer sides of each needle hub 13 are respectively provided with the inner needle assembly 14 and the push rod assembly 12. The cooperation mode of each push rod assembly 12 and the needle hub 13 is a sliding cooperation, and the sliding direction is the first direction. The push rod assembly 12 can be specifically set as a long strip plate structure, and the extension direction of the push rod assembly 12 is consistent with the extension direction of the needle hub 13.

[0055] A pair of inner needle assemblies 14 are respectively arranged on the inner sides of a pair of needle seats 13, and the gap between the pair of inner needle assemblies 14 is used to clamp the diaphragm, and the diaphragm is used to isolate the positive and negative electrodes of the battery cell. A first guide structure 19 is provided between the inner needle assembly 14 and the push rod assembly 12, and the first guide structure 19 is suitable for guiding the inner needle assembly 14 to move along the second direction, and the second direction is perpendicular to the first direction. That is, the first guide structure 19 is used to constrain the relative movement direction between the inner needle assembly 14 and the push rod assembly 12. Under the constraining action of the first guide structure 19, the inner needle assembly 14 and the push rod assembly 12 can move relative to each other along the second direction. It should be noted that the first direction and the second direction can be as follows Figure 1 and Figure 2 As shown, the first direction is parallel to the length direction of the needle seat 13, and the second direction is perpendicular to the first direction.

[0056] A first connecting rod 16 is disposed between the inner needle assembly 14 and the needle hub 13. Its ends are hingedly connected to the inner needle assembly 14 and the needle hub 13, respectively. When the needle hub 13 and the inner needle assembly 14 generate relative motion in a first direction, the inner needle assembly 14 is driven by the first connecting rod 16. Furthermore, because a first guide structure 19 is disposed between the inner needle assembly 14 and the push rod assembly 12, relative motion between the inner needle assembly 14 and the needle hub 13 occurs along the first guide structure 19, constrained by the first guide structure 19.

[0057] A pair of outer needle assemblies are respectively disposed on the outsides of a pair of push rod assemblies 12; a second guide structure 18 is disposed between the outer needle assembly and the push rod assembly 12. The second guide structure 18 is adapted to guide the movement of the outer needle assembly in a second direction. Similarly, under the restraining action of the second guide structure 18, the outer needle assembly and the push rod assembly 12 can only produce relative movement in the second direction. A second connecting rod 15 is disposed between the outer needle assembly and the needle hub 13. The two ends of the second connecting rod 15 are hinged to the outer needle assembly and the needle hub 13, respectively. When the needle hub 13 and the outer needle assembly produce relative movement in the first direction, the transmission action of the second connecting rod 15 can cause the outer needle assembly to have a tendency to swing. The outer needle assembly is also restrained by the second guide structure 18, causing the outer needle assembly to produce movement in the second direction.

[0058] The needle winding mechanism provided in this embodiment is driven by a linear drive mechanism to feed or retract along a first direction. Before winding the battery cell, when the needle winding mechanism performs the needle insertion action, the linear drive mechanism drives the needle seat 13 to feed along the first direction, and the end of the needle seat 13 is inserted into the external sleeve. The push rod assembly 12 is against the annular end surface of the sleeve. Then, the linear drive mechanism drives the needle seat 13 to further enter the sleeve. At this time, the push rod assembly 12 and the needle seat 13 produce a relative displacement in the first direction. Since a first guide structure 19 and a second guide structure 18 are respectively provided between the push rod assembly 12 and the inner needle assembly 14 and the outer needle assembly, and a first connecting rod 16 and a second connecting rod 16 are respectively provided between the needle seat 13 and the inner needle assembly 14 and the outer needle assembly. When the connecting rod 15 and the needle seat 13 extend relative to the push rod assembly 12 in the first direction, the needle seat 13 simultaneously drives the inner needle assembly 14 and the outer needle assembly to move under the transmission action of the first connecting rod 16 and the second connecting rod 15. Under the restraining action of the first guide structure 19 and the second guide structure 18, the push rod assembly 12 remains relatively stationary with the inner needle assembly 14 and the outer needle assembly in the first direction. The inner needle assembly 14 and the outer needle assembly can only move along the guide direction of the first guide structure 19 and the second guide structure 18, that is, in a second direction perpendicular to the first direction. When the pair of inner needle assemblies 14 are relatively close to each other in the second direction, they can clamp the diaphragm, while the pair of outer needle assemblies expand outward, thereby adjusting the outer circumference of the needle winding mechanism. Therefore, the technical solution provided by the present invention can achieve both the feeding and retraction of the needle winding mechanism and the adjustment of the outer circumference of the needle winding mechanism through only one linear drive mechanism, and does not require a drive device to be set inside the needle winding mechanism, thereby simplifying the structure and reducing costs.

[0059] In a further embodiment, the needle winding mechanism also includes a reset spring 17, the two ends of which act on the needle seat 13 and the push rod assembly 12 respectively. When the needle seat 13 extends outward in a first direction relative to the push rod assembly 12, the reset spring 17 stores energy, causing the needle seat 13 to have a movement tendency to retract in the first direction.

[0060] When the linear drive mechanism drives the needle seat 13 to extend and advance in the first direction, the needle seat 13 and the push rod assembly 12 are relatively displaced in the first direction. At this time, the return spring 17 elastically deforms and stores energy. When the linear drive mechanism drives the needle seat 13 to retract, the elastic force of the return spring 17 drives the needle seat 13 in the retracting direction, thereby driving the outer needle assembly and the inner needle assembly 14 to return to their original position.

[0061] In a further embodiment, the push rod assembly 12 is provided with a long first guide hole 121, which extends along the first direction; the needle seat 13 is provided with a slider 134, which can be slidably engaged with the first guide hole 121; the return spring 17 is arranged in the first guide hole 121, one end of the return spring 17 is against the slider 134, and the other end is against the push rod assembly 12.

[0062] The elongated first guide hole 121 provided in the push rod assembly 12 not only provides a sliding track for the slider 134, ensuring that the needle seat 13 and the push rod assembly 12 slide relative to each other in the correct direction, but also provides installation conditions for the return spring 17. The return spring 17 is disposed within the first guide hole 121, with one end abutting against the slider 134 and the other end abutting against the push rod assembly 12. This allows the return spring 17 to directly act between the needle seat 13 and the push rod assembly 12, providing a movement tendency for the needle seat 13 to retract in the first direction. When the needle seat 13 extends outward in the first direction relative to the push rod assembly 12, the slider 134 moves along the first guide hole 121, and the slider 134 compresses the return spring 17, causing the return spring 17 to produce compression deformation and store energy. During this process, the return spring 17 can play a buffering role to avoid a hard collision between the needle seat 13 and the push rod assembly 12; when the linear drive mechanism drives the needle seat 13 in the reverse direction, the return spring 17 releases energy, pushing the needle seat 13 to retract in the first direction, thereby driving the inner needle assembly 14 and the outer needle assembly to reset.

[0063] Thus, the design of the first guide hole 121 and the slider 134 makes the connection between the push rod assembly 12 and the needle seat 13 more compact, reducing unnecessary space. Moreover, the cooperation between the slider 134 and the first guide hole 121 and the cushioning effect of the return spring 17 jointly ensure the smoothness and reliability of the needle seat 13 during movement.

[0064] In a further embodiment, the needle hub 13 includes a base portion 131 and a tip portion 132. The tip portion 132 is configured as a pointed structure and is connected to one end of the base portion 131. The base portion 131 is provided with a slide groove structure 133 extending along a first direction, and the push rod assembly 12 is slidably disposed within the slide groove structure 133.

[0065] In this embodiment, the seat portion 131 is provided with a slide groove structure 133 extending along a first direction (i.e., the length of the needle seat 13). This slide groove structure 133 provides a sliding track for the push rod assembly 12, enabling the push rod assembly 12 to slide smoothly along the first direction. The shape and size of the slide groove structure 133 should match the push rod assembly 12 to ensure a precise and stable fit between the two. This design not only improves the overall compactness of the needle winding mechanism, but also enhances the precision and stability of the fit between the needle seat 13 and the push rod assembly 12.

[0066] The needle hub 13 is divided into two parts: a body portion 131 and a tip portion 132. The body portion 131 is the main part, carrying the slide structure 133 and other functional components; while the tip portion 132 is designed as a pointed structure to facilitate easier alignment of the needle hub 13 when inserting into the mouthpiece.

[0067] In a further embodiment, both side walls of the slideway structure 133 are provided with elongated second guide holes 136, which extend along the first direction. The push rod assembly 12 is provided with a pin, which extends from both sides of the push rod assembly 12 and extends into the second guide hole 136, forming a sliding fit with the second guide hole 136. Specifically, the push rod assembly 12 is provided with an axial hole. During assembly, the axial hole and the second guide hole 136 are aligned. After the pin passes through the second guide hole 136, it is inserted into the axial hole of the push rod assembly 12, and the pin extends from both sides of the push rod assembly 12, and the pin cooperates with the second guide hole 136. Alternatively, a bearing can be installed on the pin, and the bearing forms a rolling fit with the second guide hole 136.

[0068] The two side walls of the chute structure 133 (i.e., the two side walls relative to the direction of movement of the chute) are provided with elongated second guide holes 136. The second guide holes 136 not only extend along the extension direction of the chute structure 133 (i.e., the first direction), but also play an important guiding and limiting role. In order to match the chute structure 133, protrusion structures are correspondingly configured on both sides of the push rod assembly 12. The protrusion structure can smoothly and tightly extend into the interior of the second guide hole 136. More importantly, a sliding fit is formed between the protrusion structure and the second guide hole 136, which means that when the push rod assembly 12 moves along the chute, it can achieve smooth, non-deflected linear motion with the help of the guiding effect of the second guide hole 136. Due to the close fit between the protrusion structure and the second guide hole 136, the push rod assembly 12 reduces the possibility of shaking and deflection during movement, thereby improving the stability of the overall structure.

[0069] In a further embodiment, the needle seat 13 is provided with an elongated hole 135 extending along the first direction, and the first guiding structure 19 passes through the elongated hole 135 .

[0070] Since the needle hub 13 is located between the push rod assembly 12 and the inner needle assembly 14, in order to facilitate the connection between the push rod assembly 12 and the inner needle assembly 14 (the push rod assembly 12 and the inner needle assembly 14 are connected via the first guide structure 19), and to prevent the first guide structure 19 from interfering with the movement of the needle hub 13, in this embodiment, an elongated hole 135 extending along a first direction is provided on the needle hub 13. The first guide structure 19 passes through the elongated hole 135. When relative displacement in the first direction occurs between the needle hub 13 and the push rod assembly 12 or the inner needle assembly 14, the first guide structure 19 passes through the elongated hole 135, allowing the needle hub 13 to generate relative displacement in the first direction with the first guide structure 19. Moreover, this design not only meets functional requirements but also makes the overall structure more compact, helping to reduce the overall volume of the mechanism.

[0071] In a further embodiment, the outer needle assembly is provided with a groove structure 111 , and the needle seat 13 and the push rod assembly 12 are arranged in the groove structure 111 ; the outer side surface of the outer needle assembly is provided as a semi-cylindrical surface.

[0072] The outer needle assembly can be configured as a semi-cylindrical structure, and when the pair of outer needle assemblies are connected, they form a complete cylindrical shape. The longitudinal planes of the pair of outer needle assemblies are arranged correspondingly, and a groove structure 111 is provided on the plane. The needle seat 13 and the push rod assembly 12 are both disposed within the groove structure 111. When the inner needle assembly 14 is in the retracted state, the inner needle assembly 14 can also fall into the groove structure 111.

[0073] The groove structure 111 of the outer needle assembly serves as a storage space for the needle seat 13 and the push rod assembly 12, so that the needle seat 13 and the push rod assembly 12 can be completely hidden inside the outer needle assembly when they are not needed, thereby reducing the volume and complexity of the overall device. And through the groove structure 111, the needle seat 13 and the push rod assembly 12 can be effectively protected from interference and contact with external components, and it also helps to reduce the risk of accidental touch during use. The outer needle assembly in this further embodiment achieves high integration, space optimization and ease of operation of the overall device by providing the groove structure 111. Moreover, in this embodiment, the outer needle assembly is designed to be semi-cylindrical, and this shape enables a pair of outer needle assemblies to be combined into a complete cylindrical structure or a quasi-cylindrical structure, and then the battery cell structure formed by winding also corresponds to a cylindrical or quasi-cylindrical shape.

[0074] In a further embodiment, the first guide structure 19 and the second guide structure 18 are both configured as linear bearing structures. The first guide structure 19 and the second guide structure 18 are respectively used to guide the inner needle assembly 14 and the outer needle assembly to move along the second direction (perpendicular to the first direction) so as to clamp or loosen the diaphragm and to adjust the outer circumference of the needle winding mechanism. The first guide structure 19 and the second guide structure 18 are configured as linear bearing structures, which can make the movement of the inner needle assembly 14 and the outer needle assembly along the second direction smoother. It should also be noted that in some embodiments, the first guide structure 19 and the second guide structure 18 can be coaxially arranged. For example, a linear bearing mounting hole 122 can be provided on the push rod assembly 12, and the first linear bearing (first guide structure 19) is installed from the first end of the linear bearing mounting hole 122, and the second linear bearing (second guide structure 18) is installed from the second end of the linear bearing mounting hole 122. In this way, the arrangement and installation of the first guide structure 19 and the second guide structure 18 are facilitated. In addition, the first guide structure 19 and the second guide structure 18 may also be an integrated structure, that is, the two may together constitute a bidirectional linear bearing, and the bidirectional linear bearing is installed in the linear bearing installation hole 122 .

[0075] In a further embodiment, the inner needle assembly 14 includes an inner needle plate 141 and a clamping plate 142, which are disposed in a corresponding manner with an elastic member disposed therebetween. The inner needle plate 141 and the clamping plate 142 can be connected relatively close to each other or relatively far apart. For example, one of the inner needle plate 141 and the clamping plate 142 is provided with a guide post, and the other is provided with a guide hole. The guide post is inserted into the guide hole and can slide axially within the guide hole. The elastic member is disposed between the inner needle plate 141 and the clamping plate 142. A first guide structure 19 is disposed between the inner needle plate 141 and the push rod assembly 12. A first connecting rod 16 is disposed between the inner needle plate 141 and the needle seat 13. The pair of clamping plates 142 are used to clamp the diaphragm.

[0076] With such arrangement, when a pair of clamping plates 142 clamp the diaphragm, since an elastic member is provided between the inner needle plate 141 and the clamping plates 142 , the elastic member can act as a buffer, thereby avoiding the problem of rigid contact between the clamping plates 142 and the diaphragm causing damage to the diaphragm.

[0077] Another embodiment of the present invention provides another needle winding mechanism, comprising a linear drive mechanism, a pair of needle seats 13, a pair of inner needle assemblies 14, a pair of outer needle assemblies, and a pair of push rod assemblies 12. The linear drive mechanism is in driving connection with the pair of needle seats 13 and is adapted to drive the pair of needle seats 13 to move in a first direction. The pair of push rod assemblies 12 are respectively disposed outside the pair of needle seats 13, and the push rod assemblies 12 and the needle seats 13 are slidably engaged in the first direction.

[0078] A pair of inner needle assemblies 14 are respectively arranged on the inner sides of a pair of needle seats 13. The gap between the pair of inner needle assemblies 14 is used to clamp the diaphragm, and a first guide structure 19 is provided between the inner needle assembly 14 and the push rod assembly 12. The first guide structure 19 is suitable for guiding the inner needle assembly 14 to move along a second direction, and the second direction is perpendicular to the first direction. A first connecting rod 16 is provided between the inner needle assembly 14 and the needle seat 13, and both ends of the first connecting rod 16 are hinged to the inner needle assembly 14 and the needle seat 13 respectively.

[0079] A pair of outer needle assemblies are respectively arranged on the outside of a pair of push rod assemblies 12; a third guide structure 21 is provided between the needle seat 13 and the outer needle assembly, and the third guide structure 21 is suitable for guiding the outer needle assembly to move along the second direction. A fourth guide structure 20 is provided between the outer needle assembly and the push rod assembly 12, and the fourth guide structure 20 is suitable for guiding the outer needle assembly to move along the third direction, and the third direction forms an acute angle with the first direction.

[0080] The structures of the above-mentioned components can refer to the structures of the above-mentioned embodiments, and will not be described in detail here. Figure 8 and Figure 9As shown, a third guide structure 21 is provided between the needle seat 13 and the outer needle assembly provided in this embodiment, and the third guide structure 21 is suitable for guiding the outer needle assembly to move along the second direction, and a fourth guide structure 20 is provided between the outer needle assembly and the push rod assembly 12, and the fourth guide structure 20 is suitable for guiding the outer needle assembly to move along the third direction, and the third direction is at an acute angle to the first direction (while in the above embodiment, the needle seat 13 and the outer needle assembly are connected by a second connecting rod 15, and a second guide structure 18 is provided between the outer needle assembly and the push rod assembly 12, and the guiding direction of the second guide structure 18 is perpendicular to the first direction).

[0081] The needle winding mechanism provided in this embodiment is driven by a linear drive mechanism to feed or retract along a first direction. Before winding the battery cell, when the needle winding mechanism performs the needle insertion action, the linear drive mechanism drives the needle seat 13 to feed along the first direction, and the end of the needle seat 13 is inserted into the external sleeve. The push rod assembly 12 abuts against the annular end surface of the sleeve, and then the linear drive mechanism drives the needle seat 13 to further enter the sleeve. At this time, the push rod assembly 12 and the needle seat 13 generate relative displacement in the first direction. Since a first guide structure 19 is provided between the push rod assembly 12 and the inner needle assembly 14, In addition, a first connecting rod 16 is provided between the needle seat 13 and the inner needle assembly 14. When the needle seat 13 extends in a first direction relative to the push rod assembly 12, the needle seat 13 drives the inner needle assembly 14 to move under the transmission action of the first connecting rod 16. Under the constraint action of the first guide structure 19, the push rod assembly 12 remains relatively stationary with the inner needle assembly 14 in the first direction. The inner needle assembly 14 can only move in the guide direction of the first guide structure 19, that is, in a second direction perpendicular to the first direction. When a pair of inner needle assemblies 14 are relatively close to each other along the second direction, they can clamp the diaphragm.

[0082] At the same time, since a third guide structure 21 is provided between the needle seat 13 and the outer needle assembly, the third guide structure 21 is suitable for guiding the outer needle assembly to move along the second direction (perpendicular to the first direction), the needle seat 13 and the outer needle assembly remain relatively stationary in the first direction, that is, the outer needle assembly extends along the first direction with the needle seat 13. At the same time, since a fourth guide structure 20 is provided between the outer needle assembly and the push rod, the fourth guide structure 20 is suitable for guiding the outer needle assembly to move along the third direction, and the third direction forms an acute angle with the first direction, such as Figure 8 As shown, the third direction forms an acute angle with the first direction. The outer needle assembly moves obliquely outward relative to the push rod assembly 12 along the fourth guide structure 20, thereby adjusting the outer circumference. This solution also utilizes a single linear drive mechanism to both advance and retract the needle winding mechanism and adjust its outer circumference. Furthermore, it eliminates the need for a drive device within the needle winding mechanism, simplifying the structure and reducing costs.

[0083] An embodiment of the present invention further provides a battery cell winding machine, comprising any one of the winding needle mechanisms described above.

[0084] The battery cell winding machine provided in this embodiment includes any of the aforementioned winding needle mechanisms. Therefore, the battery cell winding machine provided in this embodiment can resolve or improve the technical issues of the complex and high-cost winding needle mechanism. The derivation process for this beneficial effect is generally similar to that for the aforementioned winding needle mechanism and will not be repeated here.

[0085] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A needle winding mechanism, characterized in that: It comprises a linear drive mechanism, a pair of needle seats (13), a pair of inner needle assemblies (14), a pair of outer needle assemblies and a pair of push rod assemblies (12); wherein, The linear drive mechanism is in transmission connection with a pair of needle seats (13), and the linear drive mechanism is suitable for driving the pair of needle seats (13) to move along a first direction; A pair of push rod assemblies (12) are respectively arranged on the outside of a pair of needle seats (13), and the push rod assemblies (12) and the needle seats (13) are slidably matched along the first direction; A pair of inner needle assemblies (14) are respectively arranged on the inner sides of a pair of needle seats (13); a gap between the pair of inner needle assemblies (14) is used to clamp a diaphragm; and a first guide structure (19) is provided between the inner needle assembly (14) and the push rod assembly (12); the first guide structure (19) is suitable for guiding the inner needle assembly (14) to move along a second direction, the second direction being perpendicular to the first direction; a first connecting rod (16) is provided between the inner needle assembly (14) and the needle seat (13); and two ends of the first connecting rod (16) are respectively hinged to the inner needle assembly (14) and the needle seat (13); A pair of outer needle assemblies are respectively arranged on the outside of a pair of push rod assemblies (12); a second guide structure (18) is provided between the outer needle assembly and the push rod assembly (12), the second guide structure (18) is suitable for guiding the outer needle assembly to move along the second direction, a second connecting rod (15) is provided between the outer needle assembly and the needle seat (13), and two ends of the second connecting rod (15) are respectively hinged to the outer needle assembly and the needle seat (13); The needle winding mechanism further comprises: The return spring (17) has two ends acting on the needle seat (13) and the push rod assembly (12) respectively. When the needle seat (13) is extended outward along the first direction relative to the push rod assembly (12), the return spring (17) stores energy, so that the needle seat (13) has a movement tendency of retracting along the first direction.

2. The needle winding mechanism according to claim 1, characterized in that: The push rod assembly (12) is provided with a first elongated guide hole (121), and the first guide hole (121) extends along the first direction; The needle seat (13) is provided with a slider (134), and the slider (134) is slidably engaged with the first guide hole (121); The return spring (17) is arranged in the first guide hole (121), one end of the return spring (17) abuts against the slider (134), and the other end abuts against the push rod assembly (12).

3. The needle winding mechanism according to claim 1, characterized in that: The needle seat (13) comprises a seat body (131) and a tip portion (132), wherein the tip portion (132) is configured as a pointed structure, and the tip portion (132) is connected to one end of the seat body (131); The seat body (131) is provided with a sliding groove structure (133) extending along the first direction, and the push rod assembly (12) is slidably arranged inside the sliding groove structure (133).

4. The needle winding mechanism according to claim 3, characterized in that: Both side walls of the slide groove structure (133) are provided with a second long guide hole (136), and the second guide hole (136) extends along the first direction; The push rod assembly (12) is provided with a pin shaft, and the pin shaft extends from both sides of the push rod assembly (12). The pin shaft extends into the second guide hole (136) and is in sliding fit with the second guide hole (136).

5. The needle winding mechanism according to claim 1, characterized in that: The needle seat (13) is provided with an elongated hole (135) extending along the first direction, and the first guide structure (19) passes through the elongated hole (135).

6. The needle winding mechanism according to claim 1, characterized in that: The outer needle assembly is provided with a groove structure (111), and the needle seat (13) and the push rod assembly (12) are arranged in the groove structure (111); the outer side surface of the outer needle assembly is provided as a semi-cylindrical surface.

7. The needle winding mechanism according to claim 1, characterized in that: The first guide structure (19) and the second guide structure (18) are both configured as linear bearing structures.

8. The needle winding mechanism according to claim 1, characterized in that: The inner needle assembly (14) includes an inner needle plate (141) and a clamping plate (142), wherein the inner needle plate (141) and the clamping plate (142) are arranged correspondingly, and an elastic member is arranged between the two. Wherein, the first guide structure (19) is provided between the inner needle plate (141) and the push rod assembly (12), a first connecting rod (16) is provided between the inner needle plate (141) and the needle seat (13), and a pair of clamping plates (142) are used to clamp the diaphragm.

9. A needle winding mechanism, characterized in that: It comprises a linear drive mechanism, a pair of needle seats (13), a pair of inner needle assemblies (14), a pair of outer needle assemblies and a pair of push rod assemblies (12); wherein, The linear drive mechanism is in transmission connection with a pair of needle seats (13), and the linear drive mechanism is suitable for driving the pair of needle seats (13) to move along a first direction; A pair of push rod assemblies (12) are respectively arranged on the outside of a pair of needle seats (13), and the push rod assemblies (12) and the needle seats (13) can be slidably matched along the first direction; A pair of inner needle assemblies (14) are respectively arranged on the inner sides of a pair of needle seats (13); a gap between the pair of inner needle assemblies (14) is used to clamp a diaphragm; and a first guide structure (19) is provided between the inner needle assembly (14) and the push rod assembly (12); the first guide structure (19) is suitable for guiding the inner needle assembly (14) to move along a second direction, the second direction being perpendicular to the first direction; a first connecting rod (16) is provided between the inner needle assembly (14) and the needle seat (13); and two ends of the first connecting rod (16) are respectively hinged to the inner needle assembly (14) and the needle seat (13); A pair of outer needle assemblies are respectively arranged on the outside of a pair of push rod assemblies (12); a third guide structure (21) is provided between the needle seat (13) and the outer needle assembly, and the third guide structure (21) is suitable for guiding the outer needle assembly to move along the second direction; a fourth guide structure (20) is provided between the outer needle assembly and the push rod assembly (12), and the fourth guide structure (20) is suitable for guiding the outer needle assembly to move along a third direction, and the third direction forms an acute angle with the first direction; The needle winding mechanism further comprises: The return spring (17) has two ends acting on the needle seat (13) and the push rod assembly (12) respectively. When the needle seat (13) is extended outward along the first direction relative to the push rod assembly (12), the return spring (17) stores energy, so that the needle seat (13) has a movement tendency of retracting along the first direction.

10. A battery core winding machine, characterized in that: The invention comprises the needle winding mechanism according to any one of claims 1 to 9.

Images