Needle winding mechanism and winding equipment

Abstract

This application relates to the field of battery technology, and particularly to a needle winding mechanism and winding equipment. The needle winding mechanism is used to produce battery cells, which include a positive electrode sheet, a negative electrode sheet, and a separator, with the separator disposed between the positive and negative electrode sheets. The needle winding mechanism includes a winding assembly and a cutting section. The winding assembly has a clamping gap and a winding gap. The clamping gap is suitable for inserting the separator to clamp it, and the winding gap is suitable for inserting the positive electrode sheet, negative electrode sheet, and separator to wind them. The winding assembly has a receiving cavity inside. The cutting section is disposed within the receiving cavity and is driven by a first driving mechanism. The first driving mechanism is configured to drive the cutting section to extend out of the receiving cavity to cut the separator at its end, and to drive the cutting section to retract into the receiving cavity to house the cutting section. The winding equipment includes multiple needle winding mechanisms as described above. This needle winding mechanism and winding equipment can remove excess separator from a battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a needle winding mechanism and winding equipment. Background Technology

[0002] Existing winding equipment first passes the separator through the inner clamping pin during the winding process, using the inner clamping pin to clamp the separator, causing the separator to wrap around the winding pin for 1 / 4 turn. Then, the positive and negative electrode sheets are passed in and wound to form a (wound) battery cell. However, the battery cell wound using the above method has a low energy density within a certain width requirement because 1 / 4 turn of the separator is excess material. Utility Model Content

[0003] The main purpose of this application is to propose a winding needle mechanism and winding equipment, which aims to solve the technical problem of low energy density of the currently wound battery cells.

[0004] To achieve the above objectives, this application proposes a needle winding mechanism for producing battery cells, the battery cell comprising a positive electrode, a negative electrode, and a separator, the separator being disposed between the positive electrode and the negative electrode, the needle winding mechanism comprising:

[0005] A winding assembly is provided with a clamping gap and a winding gap. The clamping gap is adapted to insert the diaphragm to clamp the diaphragm. The winding gap is adapted to insert the positive electrode plate, the negative electrode plate and the diaphragm to wind the positive electrode plate, the negative electrode plate and the diaphragm. The winding assembly is provided with a receiving cavity inside.

[0006] A cutting section is disposed within the receiving cavity. The cutting section is driven by a first driving mechanism, which is configured to drive the cutting section to extend out of the receiving cavity to cut the diaphragm at its end, and to drive the cutting section to retract into the receiving cavity to house the cutting section.

[0007] In some embodiments, the winding assembly includes:

[0008] A movable needle, wherein the movable needle is provided with a first inner clamping needle;

[0009] The stationary needle is provided with a second inner clamping needle, which is arranged opposite to the first inner clamping needle to form the clamping gap between the first inner clamping needle and the second inner clamping needle.

[0010] In some embodiments, the moving needle is driven by a second driving mechanism configured to drive the moving needle toward the stationary needle to reduce the distance between the first inner clamping needle and the second inner clamping needle, and the second driving mechanism is configured to drive the moving needle toward the stationary needle to increase the distance between the first inner clamping needle and the second inner clamping needle.

[0011] In some embodiments, the stationary needle includes:

[0012] The main needle is provided with a second inner clamping needle;

[0013] A secondary needle is disposed opposite to the main needle to form the winding gap between the secondary needle and the main needle.

[0014] In some embodiments, the auxiliary needle is driven by a third driving mechanism configured to drive the auxiliary needle to move along the length direction of the main needle and toward the main needle, so that the auxiliary needle and the main needle are positioned opposite each other; and the third driving mechanism is configured to drive the auxiliary needle to move along the length direction of the main needle and toward the direction away from the main needle, so as to achieve retraction of the auxiliary needle.

[0015] In some embodiments, the needle winding mechanism further includes a needle winding seat, one end of the winding assembly is connected to the needle winding seat, and the needle winding seat is provided with a locking part. After the auxiliary needle is driven by the third driving mechanism and is positioned opposite to the main needle, the end of the auxiliary needle can be connected to the locking part.

[0016] In some embodiments, the needle winding mechanism further includes a fixing frame, an end of which is provided with a locking head, and one end of the winding assembly away from the needle winding seat is connected to the locking head; the auxiliary needle can pass through the locking head so that the auxiliary needle extends out of the fixing frame and retracts into the fixing frame.

[0017] In some embodiments, the winding assembly is driven by a fourth drive mechanism configured to drive the winding assembly to rotate.

[0018] In some embodiments, the cutting portion is provided with cutting teeth.

[0019] Correspondingly, this application also proposes a winding device, comprising:

[0020] The needle winding mechanism described in any of the above embodiments;

[0021] A turret mechanism is provided, to which multiple needle winding mechanisms are connected, and the turret mechanism is configured to drive the multiple needle winding mechanisms to rotate simultaneously.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] In the technical solution of this application, when processing the battery cell using this winding needle mechanism, the separator is first inserted into the clamping gap and clamped using the clamping gap to ensure the stability of the starting end of the battery cell winding. Then, after the separator rotates 1 / 4 turn around the winding assembly, the positive and negative electrode plates begin to intervene, allowing the positive and negative electrode plates and the separator to enter the winding gap. Driven by the winding assembly, the positive and negative electrode plates and the separator are gradually wound to form the battery cell. When the battery cell rotates to a certain suitable width and the end is glued, the first drive mechanism drives the cutting part to extend from the receiving cavity. At this time, the cutting part can cut off the excess separator at the end. After the excess separator is cut off, the first drive mechanism drives the cutting part to retract into the receiving cavity to prevent the cutting part from damaging the battery cell during the battery cell unloading process.

[0024] By utilizing the cutting section, excess separators at the winding end of the battery cell can be precisely and directly removed, thereby reducing the overall thickness of the cell and improving its energy density. Furthermore, the cutting section is designed as a retractable structure. When excess separators need to be removed, the cutting section extends to cut them off promptly. After cutting, the cutting section retracts to prevent damage to the cell and ensure its structural stability.

[0025] The winding equipment provided in this application includes multiple winding needle mechanisms as described above. Driven by the turret mechanism, the multiple winding needle mechanisms can simultaneously achieve revolution and rotation, which is beneficial to improving the processing efficiency of the battery cell and shortening the processing time of the battery cell. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of a needle winding mechanism provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the overall structure of a winding assembly provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the overall structure of the cutting part provided in an embodiment of this application;

[0030] Figure 4This is a schematic diagram of the overall structure of a winding device provided in an embodiment of this application.

[0031] Explanation of icon numbers:

[0032] 10. Needle winding mechanism;

[0033] 20. Winding equipment;

[0034] 100. Winding assembly;

[0035] 110. Receiving cavity; 120. Moving needle; 130. Stationary needle;

[0036] 121. First inner clamping needle;

[0037] 131. Second inner needle; 132. Main needle; 133. Secondary needle;

[0038] 200. Cutting section;

[0039] 210. Cutting teeth;

[0040] 300. First drive mechanism;

[0041] 400. Third drive mechanism;

[0042] 500. Fourth drive mechanism;

[0043] 510. Servo motor; 520. Gear reducer; 530. Coupling;

[0044] 600. Needle winding seat;

[0045] 700. Fixture;

[0046] 710. Mold clamping head;

[0047] 800. Turret mechanism.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0052] Existing winding equipment first passes the separator through the inner clamping pin during the winding process, using the inner clamping pin to clamp the separator, causing the separator to wrap around the winding pin for 1 / 4 turn. Then, the positive and negative electrode sheets are passed in and wound to form a (wound) battery cell. However, the battery cell wound using the above method has a low energy density within a certain width requirement because 1 / 4 turn of the separator is excess material.

[0053] Based on this, in order to solve the technical problem of low energy density in currently wound battery cells, referring to Figures 1 to 3 One embodiment of this application provides a needle winding mechanism 10 for producing battery cells. The battery cell includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the positive and negative electrode. The needle winding mechanism 10 includes a winding assembly 100 and a cutting section 200. The winding assembly 100 is provided with a clamping gap and a winding gap. The clamping gap is suitable for inserting the separator to clamp it, and the winding gap is suitable for inserting the positive electrode, negative electrode, and separator to wind them. The winding assembly 100 has a receiving cavity 110 inside. The cutting part 200 is disposed within the receiving cavity 110. The cutting part 200 is driven by a first driving mechanism 300, which is configured to drive the cutting part 200 to extend out of the receiving cavity 110 to cut the diaphragm at its end, and to drive the cutting part 200 to retract into the receiving cavity 110 to house the cutting part 200. For example, the first driving mechanism 300 can be a cylinder.

[0054] Specifically, in this embodiment, when processing the battery cell using the winding needle mechanism 10, the separator is first inserted into the clamping gap and clamped using the clamping gap to ensure the stability of the starting end of the battery cell winding. Then, after the separator rotates 1 / 4 turn around the winding assembly 100, the positive and negative electrode plates begin to intervene, allowing the positive and negative electrode plates and the separator to enter the winding gap. Driven by the winding assembly 100, the positive and negative electrode plates and the separator are gradually wound to form the battery cell. When the battery cell rotates to a certain suitable width and the end is glued, the first driving mechanism 300 drives the cutting part 200 to extend from the receiving cavity 110. At this time, the cutting part 200 can cut off the excess separator at the end. After the excess separator is cut off, the first driving mechanism 300 drives the cutting part 200 to retract into the receiving cavity 110 to prevent the cutting part 200 from damaging the battery cell during the battery cell unloading process.

[0055] By utilizing the cutting section 200, excess separators at the winding end of the battery cell can be precisely and directly removed, thereby reducing the overall thickness of the battery cell and improving its energy density. Furthermore, the cutting section 200 is designed as a retractable structure. When it is necessary to remove excess separators, the cutting section 200 extends to cut the excess separators promptly. After the separators are cut, the cutting section 200 retracts to prevent damage to the battery cell and ensure its structural stability.

[0056] In some embodiments, refer to Figure 2 The winding assembly 100 includes a moving needle 120 and a stationary needle 130. The moving needle 120 is provided with a first inner clamping needle 121. The stationary needle 130 is provided with a second inner clamping needle 131, which is disposed opposite to the first inner clamping needle 121 to form a clamping gap between the first inner clamping needle 121 and the second inner clamping needle 131.

[0057] Specifically, in this embodiment, a specific structure for forming a clamping gap is provided. When the diaphragm is inserted into the clamping gap, one side of the diaphragm contacts the first inner clamping pin 121, and the other side of the diaphragm contacts the second inner clamping pin 131. Through the clamping action between the first inner clamping pin 121 and the second inner clamping pin 131, the diaphragm can be clamped in the clamping gap to ensure the fixed stability of the diaphragm, thereby improving the structural stability and compactness of the battery cell during winding and improving the winding quality of the battery cell.

[0058] In some embodiments, refer to Figure 2The movable needle 120 is driven by a second drive mechanism, which is configured to drive the movable needle 120 toward the stationary needle 130 to reduce the distance between the first inner clamping needle 121 and the second inner clamping needle 131, and also configured to drive the movable needle 120 away from the stationary needle 130 to increase the distance between the first inner clamping needle 121 and the second inner clamping needle 131. For example, the second drive mechanism can be a cylinder, etc.

[0059] Specifically, in this embodiment, before the diaphragm is inserted into the clamping gap, the second driving mechanism drives the moving needle 120 to move away from the stationary needle 130, resulting in a larger gap between the first inner clamping needle 121 and the second inner clamping needle 131. This means the clamping gap has a wider width, facilitating the insertion of the diaphragm and preventing interference from either the first or second inner clamping needle 121, thus reducing the difficulty of inserting the diaphragm. After the diaphragm is inserted into the clamping gap, the second driving mechanism drives the moving needle 120 to move closer to the stationary needle 130, resulting in a smaller gap between the first and second inner clamping needles 121. This means the clamping gap has a narrower width, facilitating clamping the diaphragm within the clamping gap and preventing displacement of the diaphragm during winding, thereby improving the processing accuracy and quality of the battery cell.

[0060] In some embodiments, refer to Figure 2 The stationary needle 130 includes a main needle 132 and an auxiliary needle 133. The main needle 132 is provided with a second inner clamping needle 131. The auxiliary needle 133 is disposed opposite to the main needle 132 to form a winding gap between the auxiliary needle 133 and the main needle 132.

[0061] Specifically, in this embodiment, a specific structure for forming a winding gap is provided. When the positive electrode, negative electrode, and separator are wound circumferentially and pass through the winding gap, one side of the above-mentioned layer structure contacts the main needle 132, and the other side of the above-mentioned layer structure contacts the auxiliary needle 133. Through the clamping action between the main needle 132 and the auxiliary needle 133, the above-mentioned layer structure can be clamped in the winding gap, ensuring the fixation stability and winding consistency of the above-mentioned layer structure during the winding process, and improving the processing quality and processing accuracy of the battery cell.

[0062] In some embodiments, refer to Figure 1 and Figure 2The auxiliary needle 133 is driven by a third drive mechanism 400, which is configured to drive the auxiliary needle 133 to move along the length direction of the main needle 132 and toward the main needle 132, so that the auxiliary needle 133 and the main needle 132 are positioned opposite each other; and the third drive mechanism 400 is configured to drive the auxiliary needle 133 to move along the length direction of the main needle 132 and away from the main needle 132, so as to achieve the retraction of the auxiliary needle 133. For example, the third drive mechanism 400 can be a rodless cylinder or a lead screw, etc.

[0063] Specifically, in this embodiment, before the layer structure composed of the positive electrode, negative electrode, and separator is inserted into the winding gap, the third driving mechanism 400 drives the auxiliary needle 133 to move along the length direction of the main needle 132 and away from the main needle 132. At this time, the auxiliary needle 133 is in a retracted state, so that the auxiliary needle 133 will not interfere with the layer structure during the winding process, allowing the layer structure to be easily placed on the main needle 132. After the layer structure composed of the positive electrode, negative electrode, and separator has rotated approximately 2 / 3 of a turn, the third driving mechanism 400 drives the auxiliary needle 133 to move along the length direction of the main needle 132 and towards the main needle 132. At this time, the auxiliary needle 133 is in an extended state, forming a winding gap between the auxiliary needle 133 and the main needle 132. This allows the layer structure to be clamped between the main needle 132 and the auxiliary needle 133, achieving stable fixation of the layer structure, ensuring winding consistency, and improving the processing quality and accuracy of the battery cell.

[0064] The auxiliary needle 133 is designed as a retractable structure, which facilitates the insertion of the layered structure formed by the positive electrode, negative electrode, and separator into the winding gap, preventing the auxiliary needle 133 from interfering with the insertion of the layered structure. It also facilitates the stable fixing of the layered structure formed by the positive electrode, negative electrode, and separator, improving the winding effect of the layered structure. Moreover, after the cell winding is completed, the auxiliary needle 133 can be retracted to facilitate the unloading of the cell from the needle winding mechanism 10.

[0065] In some embodiments, refer to Figure 1 The needle winding mechanism 10 also includes a needle winding seat 600. One end of the winding assembly 100 is connected to the needle winding seat 600. The needle winding seat 600 is provided with a locking part. After the auxiliary needle 133 is driven by the third drive mechanism 400 and is positioned opposite to the main needle 132, the end of the auxiliary needle 133 can be connected to the locking part. For example, the locking part can be a recessed hole. When the auxiliary needle 133 moves into position, the end of the auxiliary needle 133 can be inserted into the recessed hole. Alternatively, the end of the auxiliary needle 133 can be provided with a first magnetic attraction member, and the locking part can be a second magnetic attraction member. When the auxiliary needle 133 moves into position, the first magnetic attraction member and the second magnetic attraction member can automatically attract each other.

[0066] Specifically, in this embodiment, after the auxiliary needle 133 moves into position, the locking part can limit the auxiliary needle 133 to ensure the positioning stability of the auxiliary needle 133, improve the connection strength between the auxiliary needle 133 and the winding needle seat 600, reduce the vibration of the auxiliary needle 133 during the winding process of the battery cell, and prevent the auxiliary needle 133 from shaking during the winding process of the battery cell, thereby helping to maintain the clamping degree of the winding gap and improve the processing quality and processing accuracy of the battery cell.

[0067] In some embodiments, refer to Figure 1 The needle winding mechanism 10 also includes a fixing frame 700, with a locking head 710 at one end. The end of the winding assembly 100 away from the needle winding seat 600 is connected to the locking head 710. The auxiliary needle 133 can pass through the locking head 710, allowing it to extend out of the fixing frame 700 and retract into it. For example, the locking head 710 may be partially hollowed out on both sides and lubricated internally to guide the insertion and exit of the auxiliary needle 133.

[0068] Specifically, in this embodiment, by setting up the fixing frame 700, on the one hand, it can provide storage space for the auxiliary pin 133. When the battery cell is not wound, the auxiliary pin 133 can retract into the interior of the fixing frame 700, thereby saving the space occupied by the auxiliary pin 133 and reducing the overall volume of the winding needle mechanism 10. At the same time, the fixing frame 700 can also provide protection for the auxiliary pin 133, preventing the auxiliary pin 133 from being damaged by external forces. On the other hand, it can provide installation space for the drive mechanism, improve the integration level of the winding needle mechanism 10. The fixing frame 700 and the drive mechanism can form a module to facilitate the assembly, maintenance or disassembly of the winding needle mechanism 10. Furthermore, it can improve the overall structural strength and rigidity of the winding needle mechanism 10, enhance the overall shock resistance of the winding needle mechanism 10, and extend the service life of the winding needle mechanism 10.

[0069] In some embodiments, refer to Figure 1 The winding assembly 100 is driven by a fourth drive mechanism 500, which is configured to drive the winding assembly 100 to rotate. For example, the fourth drive mechanism 500 may include a servo motor 510, a reducer 520, and a coupling 530. The servo motor 510 provides power for the rotation of the winding assembly 100, the reducer 520 reduces the rotational speed of the winding assembly 100 and improves the rotational accuracy of the winding assembly 100, and the coupling 530 indirectly connects the reducer 520 and the winding assembly 100, reducing the assembly difficulty of both.

[0070] Specifically, in this embodiment, under the drive of the fourth drive mechanism 500, the winding assembly 100 can rotate, thereby enabling the winding assembly 100 to drive the positive electrode sheet, negative electrode sheet, and separator to rotate, ultimately forming a wound battery cell. In the above solution, the connection structure between the fourth drive mechanism 500 and the winding assembly 100 is simple, inexpensive, and easy to implement.

[0071] In some embodiments, refer to Figure 3 The cutting section 200 is provided with cutting teeth 210. The cutting teeth 210 have a sharp structure, which can easily cut the diaphragm and prevent the diaphragms from sticking together, thereby improving the cutting efficiency and cutting effect of the diaphragm.

[0072] Correspondingly, another embodiment of this application also provides a winding device 20, referring to... Figure 4 The winding device 20 includes a plurality of needle winding mechanisms 10 as described in any of the above embodiments. The winding device 20 also includes a turret mechanism 800, to which the plurality of needle winding mechanisms 10 are connected. The turret mechanism 800 is configured to drive the plurality of needle winding mechanisms 10 to rotate simultaneously.

[0073] Specifically, in this embodiment, the winding equipment 20 provided by this application includes a plurality of the above-mentioned winding needle mechanisms 10, and under the drive of the turret mechanism 800, the plurality of winding needle mechanisms 10 can simultaneously realize revolution and rotation, thereby improving the processing efficiency of the battery cell and shortening the processing time of the battery cell.

[0074] One possible implementation is to first place the separator electrode vertically in the material waiting position, with the first separator, the second anode electrode, the third separator, and the fourth cathode electrode from left to right. The anode electrode is about 1 / 4 turn of the winding needle length away from the top of the separator, and the cathode electrode is shorter than the distance between the anode electrode and the separator. Refer to the actual cell design size requirements for details.

[0075] Then, after passing the two diaphragms through a certain appropriate distance between the first inner clamping needle 121 and the second inner clamping needle 131, the needle coiler 600 moves forward and pushes the protrusion button of the needle coiler 600. The first inner clamping needle 121 moves closer to the second inner clamping needle 131 to clamp the diaphragm. At the same time, the cam button on the other side of the needle coiler 600 is pressed to move the moving needle 120 to the appropriate position. Then, the bottom of the needle coiler 600 moves forward through the lateral force and makes the needle coiling needle head cooperate and fix with the mold locking head 710. Then, the moving needle coiling needle 120 and the stationary needle main needle 132 are rotated 1 / 4 turn so that the diaphragm passes around and through the stationary needle main needle 132 2 / 3 turn. At the same time, the mold locking head 710 rotates synchronously under the force of the servo motor 510.

[0076] Next, the stationary needle auxiliary needle 133 moves laterally forward under the thrust of the rodless cylinder or lead screw, so that the needle tip of the stationary needle auxiliary needle 133 engages with the concave hole of the needle winding seat 600, completing the merging and approaching of the stationary needle main needle 132 and auxiliary needle 133. Then, the diaphragm and electrode sheet continue to rotate until they are wound to a certain layer and reach the width value designed for the battery cell, and then the end is finished with adhesive.

[0077] After the battery cell processing is completed, the rotation stops, and the cutting part 200 inside the coil needle begins to operate under the force of the cylinder to cut the diaphragm.

[0078] After the diaphragm is cut, the stationary needle 133 retracts back into the fixed frame 700 under the action of the rodless cylinder or lead screw. At the same time, the needle winding action retracts inward under the action of the cam button of the needle winding seat 600, and then the needle is pulled out to extract the battery cell.

[0079] While the battery cell is being pulled out, the inner clamping needle remains clamped to peel the remaining diaphragm out of the battery cell. After the battery cell is completely pulled out, the inner clamping needle is released by the cam of the winding needle holder 600, and the remaining diaphragm is placed in a fixed waste box.

[0080] After the first needle winding mechanism 10 completes its operation, the turret mechanism 800 rotates to the second needle winding mechanism 10, and the operation of the first needle winding mechanism 10 is synchronized. After the second needle winding mechanism 10 completes its operation, the turret mechanism 800 rotates to the third needle winding mechanism 10, and so on, repeating in a cycle to achieve automatic winding and cutting of excess material diaphragm.

[0081] Thanks to the improvements to the needle winding mechanism 10 described above, the winding device 20 of this embodiment has the same technical effects as the needle winding mechanism 10 described above, which will not be repeated here.

[0082] It should be noted that other undisclosed aspects of the needle winding mechanism 10 and winding equipment 20 provided in this application can be found in the prior art, and will not be repeated here.

[0083] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A needle winding mechanism for producing battery cells, the battery cell comprising a positive electrode, a negative electrode, and a separator, the separator being disposed between the positive electrode and the negative electrode, characterized in that, The needle winding mechanism includes: A winding assembly is provided with a clamping gap and a winding gap. The clamping gap is adapted to insert the diaphragm to clamp the diaphragm. The winding gap is adapted to insert the positive electrode plate, the negative electrode plate and the diaphragm to wind the positive electrode plate, the negative electrode plate and the diaphragm. The winding assembly is provided with a receiving cavity inside. A cutting section is disposed within the receiving cavity. The cutting section is driven by a first driving mechanism, which is configured to drive the cutting section to extend out of the receiving cavity to cut the diaphragm at its end, and to drive the cutting section to retract into the receiving cavity to house the cutting section.

2. The needle winding mechanism according to claim 1, characterized in that, The winding assembly includes: A movable needle, wherein the movable needle is provided with a first inner clamping needle; The stationary needle is provided with a second inner clamping needle, which is arranged opposite to the first inner clamping needle to form the clamping gap between the first inner clamping needle and the second inner clamping needle.

3. The needle winding mechanism according to claim 2, characterized in that, The moving needle is driven by a second driving mechanism, which is configured to drive the moving needle to move closer to the stationary needle to reduce the distance between the first inner clamping needle and the second inner clamping needle, and the second driving mechanism is configured to drive the moving needle to move away from the stationary needle to increase the distance between the first inner clamping needle and the second inner clamping needle.

4. The needle winding mechanism according to claim 2, characterized in that, The stationary needle includes: The main needle is provided with a second inner clamping needle; A secondary needle is disposed opposite to the main needle to form the winding gap between the secondary needle and the main needle.

5. The needle winding mechanism according to claim 4, characterized in that, The auxiliary needle is driven by a third driving mechanism, which is configured to drive the auxiliary needle to move along the length direction of the main needle and toward the main needle so that the auxiliary needle and the main needle are positioned opposite each other; and the third driving mechanism is configured to drive the auxiliary needle to move along the length direction of the main needle and toward the direction away from the main needle so as to achieve the retraction of the auxiliary needle.

6. The needle winding mechanism according to claim 5, characterized in that, The needle winding mechanism also includes a needle winding seat. One end of the winding assembly is connected to the needle winding seat. The needle winding seat is provided with a locking part. After the auxiliary needle is driven by the third driving mechanism and is positioned opposite to the main needle, the end of the auxiliary needle can be connected to the locking part.

7. The needle winding mechanism according to claim 6, characterized in that, The needle winding mechanism further includes a fixing frame, and a locking head is provided at the end of the fixing frame. The end of the winding assembly away from the needle winding seat is connected to the locking head. The auxiliary needle can pass through the locking head so that the auxiliary needle extends out of the fixing frame and retracts into the fixing frame.

8. The needle winding mechanism according to claim 1, characterized in that, The winding assembly is driven by a fourth drive mechanism configured to drive the winding assembly to rotate.

9. The needle winding mechanism according to claim 1, characterized in that, The cutting section is provided with cutting teeth.

10. A winding device, characterized in that, include: Multiple needle winding mechanisms as described in any one of claims 1 to 9; A turret mechanism is provided, to which multiple needle winding mechanisms are connected, and the turret mechanism is configured to drive the multiple needle winding mechanisms to rotate simultaneously.

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