A take-up mechanism and a take-up device

Abstract

The utility model relates to the technical field of pole piece winding discloses a kind of winding needle mechanism and winding device, wherein, the winding needle mechanism of the utility model, comprising: winding needle;Winding needle barrel, with winding needle connection and cover in the outside of winding needle;And rotary drive component, including magnetic field generating piece and inductor, inductor is transmission connection between winding needle barrel;Wherein, inductor is under the magnetic field effect of magnetic field generating piece and generates torque, to make winding needle barrel and winding needle rotate;The winding device of the utility model, comprising: pedestal;And multiple winding needle mechanism, wear in pedestal, and around the axis arrangement of pedestal;Wherein, winding needle mechanism is the winding needle mechanism described above.The winding needle of the utility model is directly driven by rotary drive component, can significantly reduce the size and weight of winding needle mechanism, suitable for application occasion of limited space, and it is favorable to reduce transmission error, improve the rotation accuracy of winding needle.

Description

Technical Field

[0001] This utility model belongs to the field of electrode winding technology, specifically relating to a winding needle mechanism and winding device. Background Technology

[0002] In the manufacturing process of cylindrical lithium batteries, positive electrode sheets, negative electrode sheets, and separators are stacked alternately according to a preset number of layers. Then, the positive electrode sheets, negative electrode sheets, and separators are wound by a winding machine to form a tightly structured cell. The winding machine strictly controls the stability of the winding tension to ensure that the wire winding density is uniform.

[0003] Currently, winding machines primarily use winding needles for precise winding. These needles are connected to a drive structure, which drives the needles to rotate at high speed and with precision during operation, winding the electrode sheets and diaphragms into shape. As the key component directly performing the winding action, the performance of the drive structure directly affects the winding quality and efficiency. The drive structure mainly includes a motor, which indirectly drives the rotation of the winding needles via a belt and a transmission pulley.

[0004] However, the multi-stage transmission system of belts and drive pulleys has a complex structure and occupies a large space. It is prone to reduced rotation accuracy of the winding needle due to transmission errors, which in turn affects the accuracy and stability of the battery cell winding. Utility Model Content

[0005] To address the shortcomings of the prior art, this utility model provides a needle winding mechanism and winding device. The needle winding cylinder is directly driven to rotate by a rotary drive component, thereby driving the needle to rotate and wind the electrode sheet and diaphragm. This can significantly reduce the size and weight of the needle winding mechanism, making it suitable for space-constrained applications. Furthermore, the direct drive method can reduce transmission errors and improve the rotational accuracy of the needle.

[0006] The technical effects to be achieved by this utility model are realized through the following technical aspects: In a first aspect, the present invention provides a needle winding mechanism, comprising: a needle winding; a needle winding cylinder connected to the needle winding and sleeved on the outside of the needle winding; and a rotation drive assembly, comprising a magnetic field generator and a sensing element, wherein the sensing element is connected to the needle winding cylinder in a transmission manner; wherein the sensing element generates torque under the action of the magnetic field of the magnetic field generator, so as to rotate the needle winding cylinder and the needle winding.

[0007] In some implementations, the magnetic field generating element is a stator, the sensing element is a rotor, and the rotor is sleeved on the outside of the needle winding cylinder and rotatably disposed on the inside of the stator.

[0008] In some implementations, an outer mounting cylinder for fixing the stator is provided on the outside of the needle winding cylinder, the needle winding cylinder passes through the outer mounting cylinder, and the rotor and the stator are disposed between the needle winding cylinder and the outer mounting cylinder.

[0009] In some implementations, an inner mounting cylinder for carrying a rotor is sleeved on the outer side of the needle winding cylinder, the rotor is disposed on the inner mounting cylinder, and a rotating connector is provided between the inner mounting cylinder and the needle winding cylinder, the inner mounting cylinder being rotatably connected to the needle winding cylinder via the rotating connector.

[0010] In some implementations, an encoder for detecting the rotation angle and speed of the needle roll is provided on one side of the outer mounting cylinder, and the encoder is sleeved on the outside of the needle roll.

[0011] In some implementations, a fastener for fixing the encoder is provided between the encoder and the winding cylinder.

[0012] In some implementations, a sensor for detecting the resetting of the needle cylinder is provided on one side of the encoder, and the sensor is disposed on the outer mounting cylinder.

[0013] In some implementations, a push-pull rod is slidably disposed inside the needle winding cylinder, the needle winding is disposed on the push-pull rod, and the push-pull rod drives the needle winding to be pulled out from the needle winding cylinder.

[0014] Secondly, this utility model provides a winding device, including: a base; and a plurality of winding needle mechanisms, which are inserted into the base and arranged around the axis of the base; wherein the winding needle mechanism is the winding needle mechanism described above.

[0015] In some implementations, a follower disk is provided between the base and the needle roll.

[0016] In summary, this utility model has at least the following advantages: 1. The needle winding mechanism provided by this utility model guides the electrode and diaphragm to the needle winding position, where the needle winds the electrode and diaphragm. A magnetic field generator produces a rotating magnetic field, and a sensing element generates torque under the influence of the magnetic field and rotates relative to the magnetic field generator. The sensing element drives the needle winding cylinder to rotate, thereby driving the needle winding to perform high-speed, precise rotational motion to wind the electrode and diaphragm into shape. Compared with traditional drive structures, the needle winding mechanism saves on complex multi-stage transmission systems, directly integrating the magnetic field generator and sensing element onto the needle winding cylinder, achieving structural simplification and compactness. Simultaneously, the rotary drive assembly directly drives the needle winding cylinder to rotate, reducing transmission errors and energy losses caused by transmission links, improving the rotational accuracy of the needle winding cylinder and needle, and achieving high-precision, high-efficiency winding control.

[0017] 2. The winding device provided by this utility model has high winding precision of the winding needle, which helps to ensure the alignment of the electrode sheets, the stability of the diaphragm tension and the consistency of the winding density of the battery cell during the winding process, thereby improving the winding effect of the battery cell. Attached Figure Description

[0018] Figure 1 This is a front view of the needle winding mechanism according to a specific embodiment of the present utility model.

[0019] Figure 2 This is a side view of the needle winding mechanism according to a specific embodiment of the present invention.

[0020] Figure 3 for Figure 2 A schematic diagram of the AA section.

[0021] Figure 4 This is a schematic diagram of the overall structure of the needle winding mechanism according to a specific embodiment of the present invention.

[0022] Figure 5 for Figure 4 A structural diagram from another angle.

[0023] Marked in the image: 1. Needle winding; 11. Needle winding cylinder; 12. Push-pull rod; 2. Rotary drive assembly; 21. Rotor; 22. Stator; 3. Base; 31. Outer mounting cylinder; 32. Inner mounting cylinder; 33. Rotary connecting piece; 34. Fixing piece; 35. Follower plate; 4. Encoder; 5. Sensor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Example 1: Please see Figures 1-3 The winding mechanism of this utility model can be applied in space-constrained applications to achieve high-precision and high-efficiency battery cell winding.

[0027] The needle winding mechanism of this utility model includes a needle winding 1, which winds a positive electrode plate, a negative electrode plate and a diaphragm. A needle winding cylinder 11 is sleeved on the outside of the needle winding 1.

[0028] The needle winding cylinder 11 is connected to a rotary drive assembly 2, which drives the needle winding cylinder 11 to rotate. The needle winding cylinder 11 then drives the needle winding 1 to rotate synchronously, and the needle winding 1 winds the battery cell. The rotary drive assembly 2 includes a magnetic field generator and a sensing element. The magnetic field generator generates a rotating magnetic field, and the sensing element generates torque in the magnetic field. The sensing element is connected to the needle winding cylinder 11 and drives the needle winding cylinder 11 to rotate.

[0029] Before the battery cell is wound, the winding needle 1 extends out of the winding needle cylinder 11 and is in working condition. After the diaphragm and electrode are conveyed to the winding needle 1, the winding needle 1 winds the diaphragm and electrode. Specifically, the diaphragm and electrode can be unwound by the unwinding device and then conveyed to the winding needle 1 by the guide roller. The magnetic field generator produces a rotating magnetic field, and the inductor generates torque under the action of the magnetic field. The inductor drives the winding needle cylinder 11 to rotate, and then the winding needle 1 rotates synchronously through the winding needle cylinder 11. When the winding needle 1 has wound to the preset number of turns, or when the battery cell reaches the required diameter, the inductor stops rotating, and the battery cell is removed from the winding needle 1. The winding needle 1 completes the precise winding of the battery cell.

[0030] Compared with the traditional drive structure, the rotary drive component 2 is integrated on the needle winding cylinder 11. The needle winding 1 does not need a shell and an independent bearing support structure to support the rotation, nor does it need a multi-stage transmission system of belts and drive wheels for transmission. The size and weight of the needle winding 1 mechanism of this utility model are significantly reduced, making it suitable for applications with limited space.

[0031] In addition, the rotary drive assembly 2 drives the needle cylinder 11 to rotate in a direct drive manner. Compared with the multi-stage transmission system, the rotary drive assembly 2 reduces the transmission error caused by the multi-stage transmission system, thereby achieving the purpose of accurately controlling the rotation of the needle cylinder 1.

[0032] Traditional multi-stage transmission systems suffer from energy losses due to friction and vibration in their mechanical transmission links. By directly driving the needle winding cylinder 11 to rotate via the rotary drive component 2, the overall energy transfer efficiency of the needle winding mechanism 1 is improved. Furthermore, multi-stage transmission systems suffer from slow dynamic response speeds in the needle winding 1 due to inertia and elastic deformation. The rotary drive component 2 enhances the dynamic response speed of the needle winding 1, enabling high-speed and high-precision winding control. This allows the needle winding mechanism 1 to be suitable for applications requiring frequent speed changes.

[0033] Example 2: The difference between this embodiment and Embodiment 1 is that this embodiment further optimizes the structure of the rotary drive component 2 of this utility model. Please refer to [link / reference]. Figures 2-5 .

[0034] Please see Figure 2 and Figure 3In this embodiment, the magnetic field generating component is the stator 22, and the induction component is the rotor 21. Specifically, the stator 22 can be a frameless motor stator 22, and the rotor 21 is a frameless motor rotor 21. The stator 22 includes sector-shaped stator 22 units. Each sector-shaped stator 22 unit is powered by the control system to generate a rotating magnetic field and drive the rotor 21 to rotate. The frameless motor has no easily damaged transmission components and adopts a modular sector-shaped stator 22 unit design. Even if some sector-shaped stator 22 units fail, it can still operate at a reduced rate, which improves the reliability of the rotating drive assembly 2. At the same time, the frameless motor has a faster dynamic response speed, and the stator 22 and rotor 21 can achieve high-speed and high-precision winding control.

[0035] In some specific embodiments, the rotor 21 is sleeved on the outside of the needle winding cylinder 11 and rotatably disposed on the inside of the stator 22. When the rotor 21 rotates, it directly drives the needle winding cylinder 11 to rotate.

[0036] Combination Figure 4 and Figure 5 An outer mounting cylinder 31 is provided on the outside of the needle winding cylinder 11. The needle winding cylinder 11 passes through the outer mounting cylinder 31 and rotates relative to the outer mounting cylinder 31. The rotor 21 and stator 22 are both disposed inside the outer mounting cylinder 31. In some specific embodiments, the outer mounting cylinder 31 includes a cylinder body and a cover body, which can be detachably connected by bolts. The needle winding cylinder 11 passes through the cover body and the cylinder body, and the rotor 21 and stator 22 are disposed inside the cylinder body. The outer mounting cylinder 31 is a split design, which facilitates the daily maintenance of the rotation drive assembly 2.

[0037] Furthermore, an inner mounting cylinder 32 is sleeved on the outer side of the needle winding cylinder 11, and the rotor 21 is mounted on the inner mounting cylinder 32, that is, the rotor 21 is sleeved on the outer side of the inner mounting cylinder 32. A rotating connector 33 is provided between the inner mounting cylinder 32 and the needle winding cylinder 11. When the rotor 21 drives the inner mounting cylinder 32 to rotate, the inner mounting cylinder 32 drives the needle winding cylinder 11 to rotate. Specifically, the rotating connector 33 is preferably, but not limited to, a keyless bushing. The needle winding cylinder 11 passes through the keyless bushing, and the needle winding cylinder 11 performs a stable rotation, which helps to improve the rotational accuracy of the needle winding cylinder 1.

[0038] In a preferred embodiment, an encoder 4 is provided on one side of the outer mounting cylinder 31. The encoder 4 is sleeved on the outside of the needle winding cylinder 11. When the rotor 21 drives the needle winding cylinder 11 to rotate to complete the winding of the battery cell, the encoder 4 can detect the rotation angle and speed of the needle winding cylinder 11 in real time and feed it back to the control system to achieve precise closed-loop control. Specifically, a fixing member 34 for fixing the encoder 4 is provided between the encoder 4 and the needle winding cylinder 11. The fixing member 34 is preferably, but not limited to, a retaining key. The encoder 4 is located between the fixing member 34 and the outer mounting cylinder 31, and the fixing member 34 plays the role of limiting the displacement of the encoder 4.

[0039] In some specific embodiments, a sensor 5 for detecting the reset of the needle winding cylinder 11 is provided on one side of the encoder 4. The sensor 5 is mounted on the outer mounting cylinder 31. The sensor 5 preferably, but is not limited to, a zero-return photoelectric switch. The sensor 5 detects whether the needle winding cylinder 11 has reset to the starting working position after rotation, which facilitates precise control of the number of rotations of the needle winding cylinder 1.

[0040] In some specific embodiments, a push-pull rod 12 is slidably disposed inside the needle winding cylinder 11, and the needle winding 1 is disposed on the push-pull rod 12. The push-pull rod 12 drives the needle winding 1 to be pulled out from the needle winding cylinder 11. When the battery cell is being wound, the push-pull rod 12 pushes the needle winding 1 out of the needle winding cylinder 11, and the needle winding 1 is in a ready-to-wind state. The control system sets winding parameters according to the production process, such as winding speed, tension, number of turns, etc. The control system energizes the stator 22. After the stator 22 generates a rotating magnetic field, the rotor 21 drives the needle winding cylinder 11 to rotate through the inner mounting cylinder 32. The needle winding cylinder 11 drives the push-pull rod 12 and the needle winding 1 to rotate, and the needle winding 1 winds the electrode sheet and diaphragm. During winding, the encoder 4 detects the rotation angle and speed of the needle winding cylinder 11 in real time to control the winding of the needle winding 1. When the battery cell reaches the preset number of turns or diameter, the rotor 21 stops rotating, the winding cylinder 11 and the winding needle 1 also stop rotating, the push-pull rod 12 drives the winding needle 1 to retract into the winding cylinder 11, the winding needle 1 is pulled out from the formed battery cell, and the wound battery cell can be unloaded.

[0041] Furthermore, the push-pull rod 12 is connected to a needle-pulling drive source for driving the push-pull rod 12 to slide along the needle winding cylinder 11. It is understood that the way the needle-pulling drive source drives the push-pull rod 12 to pull out the needle winding 1 is known to those skilled in the art and is feasible. For example, the needle-pulling drive source can be a needle-pulling screw, which will not be described in detail in this embodiment.

[0042] Example 3: This embodiment, based on the above embodiments, provides a winding device. Please refer to [link to previous embodiment]. Figures 3-5 It includes a base 3 and multiple needle winding mechanisms, which are mounted on the base 3 and arranged around the axis of the base 3.

[0043] In some specific embodiments, a follower disk 35 is provided between the base 3 and the syringe 11. Specifically, the follower disk 35 is rotatably mounted on the base 3, and an outer mounting cylinder 31 is mounted on the follower disk 35 and detachably connected to the follower disk 35. For example, the outer mounting cylinder 31 can be assembled with the follower disk 35 by bolts. The syringe 11 passes through the follower disk 35 and the base 3. The syringe 11 can rotate with the follower disk 35 while being driven to rotate by the rotary drive assembly 2.

[0044] Furthermore, the follower disk 35 is provided with a winding station, where the winding needle cylinder 11 winds the battery cells. The follower disk 35 is connected to a follower drive component, which is preferably, but not limited to, a follower motor. The output end of the follower motor is provided with a drive gear, and the follower disk 35 is provided with gear teeth. When the follower disk 35 is meshed with the drive gear, the follower motor can drive the follower disk 35 to rotate.

[0045] After the battery cell is wound, the push-pull rod 12 at the winding station drives the winding needle 1 to be pulled out from the formed battery cell and rotates the follower plate 35 by a certain angle, such as 120°, so that the adjacent winding needle 1 enters the winding station. The above process is repeated, and the battery cell can be continuously wound, which helps to improve the production efficiency of the battery cell.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A needle winding mechanism, characterized in that, include: Coiling needle (1); A needle winding cylinder (11) is connected to the needle winding (1) and sleeved on the outside of the needle winding (1); and The rotary drive assembly (2) includes a magnetic field generator and a sensing element, wherein the sensing element is connected to the needle winding cylinder (11) via a transmission connection; wherein the sensing element generates torque under the action of the magnetic field of the magnetic field generator, so as to rotate the needle winding cylinder (11) and the needle winding (1).

2. The needle winding mechanism according to claim 1, characterized in that, The magnetic field generating component is a stator (22), and the sensing component is a rotor (21). The rotor (21) is sleeved on the outside of the needle winding cylinder (11) and rotatably disposed on the inside of the stator (22).

3. The needle winding mechanism according to claim 2, characterized in that, The outer side of the needle winding cylinder (11) is provided with an outer mounting cylinder (31) for fixing the stator (22). The needle winding cylinder (11) passes through the outer mounting cylinder (31). The rotor (21) and the stator (22) are disposed between the needle winding cylinder (11) and the outer mounting cylinder (31).

4. The needle winding mechanism according to claim 3, characterized in that, The outer side of the needle roll (11) is fitted with an inner mounting cylinder (32) for carrying the rotor (21). The rotor (21) is mounted on the inner mounting cylinder (32). A rotating connector (33) is provided between the inner mounting cylinder (32) and the needle roll (11). The inner mounting cylinder (32) is rotatably connected to the needle roll (11) via the rotating connector (33).

5. The needle winding mechanism according to claim 3, characterized in that, An encoder (4) for detecting the rotation angle and speed of the needle cylinder (11) is provided on one side of the outer mounting cylinder (31), and the encoder (4) is sleeved on the outside of the needle cylinder (11).

6. The needle winding mechanism according to claim 5, characterized in that, A fastener (34) for fixing the encoder (4) is provided between the encoder (4) and the needle cylinder (11).

7. The needle winding mechanism according to claim 5, characterized in that, A sensor (5) for detecting the reset of the needle cylinder (11) is provided on one side of the encoder (4), and the sensor (5) is provided on the outer mounting cylinder (31).

8. The needle winding mechanism according to claim 1, characterized in that, A push-pull rod (12) is slidably disposed inside the needle cylinder (11), and the needle (1) is disposed on the push-pull rod (12). The push-pull rod (12) drives the needle (1) to be pulled out from the needle cylinder (11).

9. A winding device, characterized in that, include: Base (3); and Multiple needle winding mechanisms are threaded onto the base (3) and arranged around the axis of the base (3); The needle winding mechanism is the needle winding mechanism according to any one of claims 1-8.

10. The winding apparatus according to claim 9, characterized in that, A follower disc (35) is provided between the base (3) and the needle cylinder (11).

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