Battery cell winding device

Abstract

The utility model is applicable to the field of battery technology, and provides a battery cell winding device, including a reversing frame, a rotating mounting part, a winding needle, a needle end positioning assembly and a transmission mechanism. The needle end positioning assembly includes a needle receiving bracket and a positioning part rotatably arranged on the needle receiving bracket. By arranging a transmission mechanism between the positioning part and the rotating mounting part, the positioning part and the rotating mounting part are connected by the transmission mechanism, so that the positioning part and the rotating mounting part can be rotated synchronously, and then the winding needle and the positioning part can also keep synchronous rotation, avoiding the winding needle from twisting due to different forces on the two ends during the battery cell winding process, and thus avoiding the winding needle from driving part of the battery cell's diaphragm to move outward when being pulled out of the battery cell, resulting in the battery cell having a tower-shaped end face and a deformed center hole, thereby ensuring the quality of battery cell production.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery core winding device. Background Art

[0002] In the process of producing battery cells, a winding device is usually required to wind the battery cells. The working principle of the winding device is to drive the winding needle assembly to rotate through the driving assembly so that the winding needle assembly can realize the work of winding the battery cells. Due to the limitation of the battery cell's own process, the rigidity of the winding needle on the winding needle assembly is limited. During the production of the battery cell, the winding needle will be twisted and deformed due to the different forces at both ends. During the process of pulling the needle, the twisted winding needle is easy to drive part of the diaphragm of the battery cell to move outward, causing the end face of the battery cell to be tower-shaped and the center hole to be deformed. Utility Model Content

[0003] The utility model aims to provide a battery core winding device, aiming to solve the technical problem that the battery core in the prior art is prone to end face tower shape and center hole deformation during the production process.

[0004] The utility model is implemented as follows: a battery core winding device comprises:

[0005] Reversing rack;

[0006] A rotatable mounting portion, rotatably disposed on the reversing frame;

[0007] A winding needle, the first end of which is connected to the rotating mounting portion and is arranged along the rotating axis of the rotating mounting portion, and the winding needle is used to rotate under the drive of the rotating mounting portion to wind the battery core; the winding needle also has the freedom to extend and retract along the axial direction of the rotating mounting portion;

[0008] The needle end positioning assembly comprises a needle receiving bracket and a positioning part, wherein the needle receiving bracket is relatively fixed to the reversing frame, the positioning part is rotatably arranged on the needle receiving bracket, the rotation axis of the positioning part is coaxially arranged with the rotation axis of the rotating mounting part, and a positioning structure is arranged on the positioning part, and the positioning structure is used to contact with the second end of the winding needle to keep the winding needle stable; and

[0009] The transmission mechanism is used to transmission-connect the rotating mounting part and the positioning part so that the two parts rotate synchronously.

[0010] In an optional embodiment, the transmission mechanism includes a first gear arranged on the rotating mounting portion, a second gear arranged on the positioning portion, a third gear meshed with the first gear, a fourth gear meshed with the second gear, and a connecting shaft connected between the third gear and the fourth gear, the connecting shaft is rotatably arranged on the pin bracket, and the transmission ratio between the first gear and the third gear is equal to the transmission ratio between the first gear and the third gear.

[0011] In an optional embodiment, the winding needle includes a first petal body portion and a second petal body portion, and a clamping gap is provided between the first petal body portion and the second petal body portion, and the clamping gap is used for inserting a diaphragm and / or a battery electrode.

[0012] In an optional embodiment, the rotating mounting portion includes a rotating cylinder, a first sliding portion and a second sliding portion, the rotating cylinder is movably connected to the reversing frame, the rotating cylinder has the freedom to rotate around its own axis relative to the reversing frame, the first sliding portion and the second sliding portion are both arranged in the rotating cylinder, and the first sliding portion and the second sliding portion both have the freedom to slide only along the axial direction of the rotating cylinder relative to the rotating cylinder, the first petal body portion is connected to the first sliding portion, and the second petal body portion is connected to the second sliding portion.

[0013] In an optional embodiment, the positioning portion further includes a centering shaft, which is movably disposed on the contact needle bracket, has the freedom to rotate around its own axis relative to the contact needle bracket, and is coaxially disposed with the rotating cylinder.

[0014] In an optional embodiment, the positioning structure includes a positioning hole, the positioning hole is recessed on the end surface of the centering shaft facing the winding needle, the positioning hole is coaxially arranged with the centering shaft, and the positioning hole is used to accommodate and position the second end of the winding needle.

[0015] In an optional embodiment, a conical guide surface is further provided at the opening of the positioning hole, and the conical guide surface is arranged around the axis of the positioning hole.

[0016] In an optional embodiment, a positioning column is further provided in the positioning hole, and the outer periphery of the positioning column is spaced apart from the inner wall of the positioning hole, and the positioning column is used to cooperate with the inner wall of the positioning hole to position the first petal body part and the second petal body part.

[0017] In an optional embodiment, there are multiple winding needles, multiple rotating mounting parts, and multiple centering shafts, and the multiple centering shafts are arranged at intervals around the connecting pillar.

[0018] In an optional embodiment, the pin bracket includes a main mounting portion spaced apart from the reversing frame, and a connecting pillar connected between the main mounting portion and the reversing frame, and the centering shaft is rotatably disposed on the main mounting portion.

[0019] The technical effect of the utility model relative to the prior art is: a rotating mounting part is rotatably provided on the reversing frame, and a winding needle is provided on the rotating mounting part, and the winding needle is driven to rotate by the rotating mounting part to complete the winding of the battery cell. A positioning part is also rotatably provided on the pin bracket, and the positioning part can maintain the stability of the second end of the winding needle through the positioning structure, and a transmission device is also provided between the rotating mounting part and the positioning part. Compared with the battery cell winding device in the prior art, a transmission mechanism is provided between the positioning part and the rotating mounting part, and the positioning part is connected to the rotating mounting part through the transmission mechanism, so that the positioning part and the rotating mounting part can be rotated synchronously, and then the winding needle and the positioning part can also keep synchronous rotation, avoiding the two ends of the winding needle from twisting due to different forces during the battery cell winding process, and thus avoiding the winding needle from driving part of the diaphragm of the battery cell to move outward when being pulled out of the battery cell, thereby avoiding the end face tower shape and center hole deformation of the battery cell, ensuring the quality of battery cell production and improving the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a battery core winding device provided by an embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the rotating mounting part and the winding needle used in the embodiment of the utility model;

[0023] Figure 3 It is a partial cross-sectional structural schematic diagram of the rotating mounting portion adopted in the embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the winding needle used in the embodiment of the utility model;

[0025] Figure 5 It is a schematic cross-sectional structure diagram of the positioning portion used in the embodiment of the utility model;

[0026] Figure 6It is a structural schematic diagram of a battery cell winding device provided in another embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Reversing frame; 2. Rotating mounting part; 21. Rotating cylinder; 22. First sliding part; 23. Second sliding part; 3. Winding needle; 31. First petal body; 32. Second petal body; 33. Clamping gap; 4. Needle end positioning assembly; 41. Positioning part; 411. Centering shaft; 42. Needle receiving bracket; 421. Main mounting part; 422. Connecting pillar; 43. Positioning structure; 431. Positioning hole; 432. Conical guide surface; 433. Positioning column; 5. Transmission mechanism; 51. First gear; 52. Second gear; 53. Third gear; 54. Fourth gear; 55. Connecting shaft. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the process of producing battery cells, since the winding needle itself has a large length dimension, when the first end of the winding needle is mounted on the rotating mounting portion, the second end of the winding needle is in a free state, which will cause instability in the second end of the winding needle. In order to maintain the stability of the winding needle, a positioning portion is usually rotatably provided on the needle bracket, and a positioning structure is provided on the positioning portion to maintain the stability of the second end of the winding needle. When the positioning portion positions the second end of the winding needle through the positioning structure, the positioning portion is passively rotated under the action of the winding needle, which causes the positioning portion to apply a reaction force around the axis of rotation of the winding needle to the second end of the winding needle, so that the first end and the second end of the winding needle are subjected to different forces, thereby causing the winding needle to twist and deform. During the process of pulling out the needle, the twisted winding needle easily drives part of the diaphragm of the battery cell to move outward, causing the end face of the battery cell to become tower-shaped and the center hole to deform. In order to avoid the above situation, the utility model provides a battery cell winding device.

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Please refer to Figures 1 to 6 As shown, in an embodiment of the utility model, a battery cell winding device is provided, comprising a reversing frame 1, a rotating mounting portion 2, a winding needle 3, a needle end positioning assembly 4 and a transmission mechanism 5. The rotating mounting portion 2 is rotatably mounted on the reversing frame 1. The first end of the winding needle 3 is connected to the rotating mounting portion 2, and the winding needle 3 is arranged along the rotation axis of the rotating mounting portion 2. The winding needle 3 is used to rotate under the drive of the rotating mounting portion 2 to wind the battery cell, and the winding needle 3 also has the freedom of axial extension and contraction along the rotating mounting portion 2. The needle end positioning assembly 4 includes a needle receiving bracket 42 and a positioning portion 41. The needle receiving bracket 42 is relatively fixed to the reversing frame 1, and the positioning portion 41 is rotatably mounted on the needle receiving bracket 42. The rotation axis of the positioning portion 41 is coaxially arranged with the rotation axis of the rotating mounting portion 2. A positioning structure 43 is arranged on the positioning portion 41, and the positioning structure 43 is used to contact the second end of the winding needle 3 to maintain the stability of the winding needle 3. The transmission mechanism 5 is transmission-connected between the rotating mounting portion 2 and the positioning portion 41 , so that the positioning portion 41 and the rotating mounting portion 2 rotate synchronously.

[0036] Specifically, the reversing frame 1 refers to a component that can play a supporting role. The reversing frame 1 is generally installed on the main frame, and the reversing frame 1 has the freedom to rotate around its own axis, which can drive the components installed on the reversing frame 1 to rotate, thereby playing the role of switching workstations. The rotating mounting part 2 refers to a component with a certain length. The rotating mounting part 2 can be columnar, disc-shaped or strip-shaped. The rotating mounting part 2 can also be a rotating body structure composed of a variety of shapes. The rotating mounting part 2 has the freedom to rotate around its own axis relative to the reversing frame 1. The rotating mounting part 2 rotates on the basis of being able to rotate with the reversing frame 1. The winding needle 3 refers to a columnar component with a certain length. The winding needle 3 is arranged along the rotation axis of the rotating mounting part 2, and the first end of the winding needle 3 is installed on the rotating mounting part 2, so that the winding needle 3 can rotate with the rotating mounting part 2. Its function is to wind the diaphragm and / or the battery pole piece to form a battery cell.

[0037] In addition, the winding needle 3 has freedom along the axis of the rotating mounting part 2 relative to the rotating mounting part 2, so that the winding needle 3 can rotate with the rotating mounting part 2 and slide along the axis of the rotating mounting part 2 to complete the operations of taking out and retracting the winding needle 3, making the production of the battery cell more convenient.

[0038] The needle end positioning assembly 4 refers to an assembly that keeps the second end of the winding needle 3 stable. Since the winding needle 3 itself has a large length dimension, when the first end of the winding needle 3 is mounted on the rotating mounting portion 2, the second end of the winding needle 3 is in a free state, which will cause the instability of the second end of the winding needle 3. The needle end positioning assembly 4 includes a needle receiving bracket 42 and a positioning portion 41. The needle receiving bracket 42 refers to a component that can play a supporting role. The needle receiving bracket 42 and the reversing frame 1 are relatively fixed. The needle receiving bracket 42 can be directly mounted on the reversing frame 1, or it can be mounted on other components that rotate synchronously with the reversing frame 1. The positioning portion 41 can refer to a component with a certain length dimension. The positioning portion 41 can be columnar, disc-shaped or block-shaped, and the positioning portion 41 can also be a rotating body structure composed of a combination of multiple shapes. The positioning portion 41 is rotatably arranged on the needle receiving bracket 42, and the rotation axis of the positioning portion 41 is coaxially arranged with the rotation axis of the rotating mounting portion 2, so that the second end of the winding needle 3 can contact the positioning structure 43 on the positioning portion 41 to maintain the stability of the second end.

[0039] The positioning structure 43 refers to a receiving structure for keeping the second end of the winding needle 3 stable. The positioning structure 43 may be a receiving groove, a receiving hole, etc. When the winding needle 3 is working, the second end of the winding needle 3 may be inserted into the positioning structure 43. The second end of the winding needle 3 is limited by the positioning structure 43 to prevent the second end of the winding needle 3 from bending or shaking during the rapid rotation of the winding needle 3.

[0040] The transmission mechanism 5 is a mechanism that can connect the positioning part 41 with the rotating mounting part 2. The transmission mechanism 5 can be a chain transmission, a gear transmission, a belt transmission or a combination of multiple transmission combinations. The positioning part 41 and the rotating mounting part 2 can be kept rotating synchronously by setting the transmission mechanism 5.

[0041] The battery cell winding device provided by the embodiment of the utility model is provided with a rotating mounting portion 2 rotatably mounted on a reversing frame 1, and a winding needle 3 is provided on the rotating mounting portion 2, and the winding needle 3 is driven to rotate by the rotating mounting portion 2 to complete the winding work of the battery cell. A positioning portion 41 is also rotatably mounted on the pin bracket 42, and the positioning portion 41 can keep the second end of the winding needle 3 stable through a positioning structure 43, and a transmission device is also provided between the rotating mounting portion 2 and the positioning portion 41. Compared with the battery cell winding device in the prior art, a transmission mechanism 5 is provided between the positioning portion 41 and the rotating mounting portion 2, and the positioning portion 41 is connected to the rotating mounting portion 2 through the transmission mechanism 5. The positioning portion 41 and the rotating mounting portion 2 can be rotated synchronously, and the winding needle 3 and the positioning portion 41 can also maintain synchronous rotation, thereby avoiding the two ends of the winding needle 3 from twisting due to different forces during the battery cell winding process, thereby avoiding the winding needle 3 from driving part of the battery cell's diaphragm to move outward when being pulled out of the battery cell, thereby avoiding the occurrence of end face tower shape and center hole deformation of the battery cell, ensuring the quality of battery cell production and improving the quality of the battery cell.

[0042] It should be noted that the rotating mounting part 2, the winding needle 3 and the positioning part 41 can form a production unit. In order to improve the production efficiency of the battery cell winding, the number of production units can be multiple. The multiple production units are spaced and evenly arranged around the rotation axis of the reversing frame 1. The multiple production units can simultaneously carry out the winding production of multiple battery cells, thereby improving the production efficiency of the battery cell winding device. As a match, the number of transmission mechanisms 5 is also multiple, and a transmission mechanism 5 is arranged between each rotating mounting part 2 and each positioning part 41, so that the rotation of the positioning part 41 and the winding needle 3 in each production unit is synchronized.

[0043] In one embodiment, see Figure 1The transmission mechanism 5 includes a first gear 51 disposed on the rotating mounting portion 2, a second gear 52 disposed on the positioning portion 41, a third gear 53 meshed with the first gear 51, and a fourth gear 54 meshed with the second gear 52, the third gear 53 is connected to the fourth gear 54, and the two are coaxially arranged, and the transmission ratio between the first gear 51 and the third gear 53 is equal to the transmission ratio between the first gear 51 and the third gear 53. Specifically, the first gear 51, the second gear 52, the third gear 53 and the fourth gear 54 all refer to a gear structure with meshing teeth around the circumference. The first gear 51 is coaxially arranged with the rotating mounting portion 2, and the second gear 52 is coaxially arranged with the positioning portion 41. The transmission ratio refers to the ratio of the angular velocities of the two rotating components in the mechanism, also known as the speed ratio. The transmission ratio between the first gear 51 and the third gear 53 is equal to the transmission ratio between the first gear 51 and the third gear 53. At the same time, since the third gear 53 is connected to the fourth gear 54, the angular velocity of the rotation of the rotating mounting part 2 and the positioning part 41 is guaranteed to be always consistent, so that the angular velocity of the rotation of the winding needle 3 and the positioning part 41 can be kept consistent. Through the transmission mode in which the first gear 51 is meshed with the third gear 53, the second gear 52 and the fourth gear 54 are meshed with each other, and the third gear 53 is coaxially connected to the fourth gear 54, the transmission between the rotating mounting part 2 and the positioning part 41 can be guaranteed to be more accurate, and the stability of the operation of the entire transmission mechanism 5 can also be guaranteed.

[0044] In an alternative embodiment, see Figure 1 The diameters of the first gear 51 and the second gear 52 can be equal, and the diameters of the third gear 53 and the fourth gear 54 can be equal, so that the transmission ratio between the first gear 51 and the third gear 53 is equal to the transmission ratio between the first gear 51 and the third gear 53, thereby ensuring the synchronization of the rotation between the rotating mounting part 2 and the positioning part 41.

[0045] In one embodiment, see Figure 1A connecting shaft 55 is provided between the third gear 53 and the fourth gear 54, and the connecting shaft 55 is rotatably provided on the pin bracket 42. Specifically, the connecting shaft 55 refers to a component with a certain length dimension, and the cross-section of the connecting shaft 55 can be circular, polygonal or the like. However, when the connecting shaft 55 needs to be rotatably connected with other components, the cross-section of the connecting shaft 55 is usually circular. The third gear 53 and the fourth gear 54 are both coaxially arranged with the connecting shaft 55, and the third gear 53 and the fourth gear 54 can be respectively arranged at the two ends of the connecting shaft 55. Through the arrangement of the connecting shaft 55, on the one hand, the third gear 53 can be connected to the fourth gear 54 through the connecting shaft 55, so that the third gear 53 and the fourth gear 54 form a rigid connection, so that they can rotate synchronously, thereby ensuring the transmission stability between the third gear 53 and the fourth gear 54. On the other hand, the connecting shaft 55 can be rotatably set on the pin bracket 42, and the third gear 53 and the fourth gear 54 can be respectively installed on the two ends of the connecting shaft 55. The third gear 53 and the fourth gear 54 can be supported by the connecting shaft 55, so that the installation of the third gear 53 and the fourth gear 54 is more secure, and the meshing is also more stable and firm.

[0046] In one embodiment, see Figure 4 The winding needle 3 includes a first petal body portion 31 and a second petal body portion 32, and a clamping gap 33 is also provided between the first petal body portion 31 and the second petal body portion 32, and the clamping gap 33 is used for inserting the diaphragm and / or the battery pole piece. Specifically, the first petal body portion 31 and the second petal body portion 32 both refer to components with a certain length. The first petal body portion 31 and the second petal body portion 32 are parallel to each other, and the movements of the two remain relatively independent. The cross-sections of the first petal body portion 31 and the second petal body portion 32 can be semicircular, wherein the cross-section refers to the cross-section intercepted by a plane perpendicular to the length direction. The first petal part 31 and the second petal part 32 are arranged parallel to each other, and a clamping gap 33 for clamping the diaphragm and / or the battery pole piece is arranged between the first petal part 31 and the second petal part 32. When the winding needle 3 is pulled out, the diaphragm and / or the pole piece can be placed in the clamping gap 33 together, and then the winding needle 3 is driven to rotate by rotating the mounting part 2 as a whole to realize the winding operation of the battery cell. After the winding of the battery cell is completed, the sliding part drives the winding needle 3 to retract the needle, so that the winding needle 3 is pulled out of the battery cell as a whole. By forming the winding needle 3 with the first petal part 31 and the second petal part 32, the winding operation of the battery cell is more convenient and quick.

[0047] In one embodiment, see Figure 2 and Figure 3The rotating mounting part 2 includes a rotating cylinder 21, a first sliding part 22 and a second sliding part 23. The rotating cylinder 21 is movably connected to the reversing frame 1. The rotating cylinder 21 has the freedom to rotate around its own axis relative to the reversing frame 1. The first sliding part 22 and the second sliding part 23 are both arranged in the rotating cylinder 21. The first sliding part 22 and the second sliding part 23 only have the freedom to slide along the axial direction of the rotating cylinder 21 relative to the rotating cylinder 21. The first petal part 31 is connected to the first sliding part 22, and the second petal part 32 is connected to the second sliding part 23. Specifically, the rotating cylinder 21 refers to a cylindrical component with a certain length. The rotating cylinder 21 has the freedom to rotate around its own axis relative to the reversing frame 1. The rotating cylinder 21 can be connected to the driving shaft in a transmission manner and rotate under the action of the driving shaft. The first sliding part 22 and the second sliding part 23 are both parts with a certain length. The first sliding part 22 and the second sliding part 23 are both arranged inside the rotating cylinder 21. The first sliding part 22 and the second sliding part 23 only have the degree of freedom along the axial direction of the rotating cylinder 21 relative to the rotating cylinder 21, which means that the first sliding part 22 and the second sliding part 23 can slide along the axis of the rotating cylinder 21 relative to the rotating cylinder 21 while rotating with the rotating cylinder 21. At least one end of the first sliding part 22 and at least one end of the second sliding part 23 are always located outside the rotating cylinder 21. The first petal part 31 is connected to the first sliding part 22, and the second petal part 32 is connected to the second sliding part 23. The other end of the first sliding part 22 and the other end of the second sliding part 23 can be driven respectively by the needle retracting and extending mechanism, so as to realize the movement of the first petal part 31 and the second petal part 32, so as to realize the overall needle retracting or needle extraction operation of the winding needle 3, which can make the needle extraction and retracting operation of the winding needle 3 more convenient.

[0048] In an alternative embodiment, see Figure 3 , the first sliding part 22 and the second sliding part 23 are sleeved with each other, and the first sliding part 22 can be sleeved on the outside of the second sliding part 23, the first sliding part 22 is slidably set inside the rotating cylinder 21, and the second sliding part 23 is slidably set inside the first sliding part 22. In this case, the first sliding part 22 is also cylindrical, the second sliding part 23 is columnar or cylindrical, and the second sliding part 23 is slidably set inside the first sliding part 22; or the second sliding part 23 can be sleeved on the outside of the first sliding part 22, the second sliding part 23 is slidably set inside the rotating cylinder 21, and the first sliding part 22 is slidably set inside the second sliding part 23. In this case, the second sliding part 23 is cylindrical, the first sliding part 22 is columnar or cylindrical, and the first sliding part 22 is slidably set inside the second sliding part 23. The sleeved installation method of the first sliding part 22 and the second sliding part 23 saves installation space.

[0049] In one embodiment, see Figure 5The positioning part 41 further includes a centering shaft 411, which is movably arranged on the receiving needle bracket 42, and has the freedom to rotate around its own axis relative to the receiving needle bracket 42, and the centering shaft 411 is coaxially arranged with the rotating cylinder 21. Specifically, the centering shaft 411 refers to a columnar component with a certain length, and the centering shaft 411 is rotatably arranged on the receiving needle bracket 42, and the centering shaft 411 is coaxially arranged with the rotating cylinder 21. The positioning part 41 adopts the centering shaft 411, which can make the rotation installation of the positioning part 41 more convenient, and also save more space for the installation of the positioning part 41.

[0050] In order to make the rotation of the centering shaft 411 more convenient, a rotating bearing can be provided between the centering shaft 411 and the receiving needle bracket 42. The rotating bearing is sleeved on the outside of the centering shaft 411. The receiving needle bracket 42 is also provided with a mounting hole, and the outer wall of the rotating bearing abuts against the inner wall of the mounting hole.

[0051] In one embodiment, see Figure 5 The positioning structure 43 includes a positioning hole 431. The positioning hole 431 is recessed on the end face of the fixed core shaft 411 facing the winding needle 3. The positioning hole 431 is coaxially arranged with the fixed core shaft 411. The positioning hole 431 is used to accommodate and position the second end of the winding needle 3. Specifically, the positioning hole 431 refers to a hole structure with a certain depth, and the positioning hole 431 is coaxially arranged with the fixed core shaft 411, that is, the positioning hole 431 is coaxially arranged with the winding needle 3. After the winding needle 3 is removed, the second end of the winding needle 3 can be extended into the interior of the positioning hole 431. The second end of the winding needle 3 is limited by the inner wall of the positioning hole 431 to avoid bending and deformation of the winding needle 3 during the rotation process, so that the rotation of the winding needle 3 can be more stable.

[0052] In one embodiment, see Figure 5 , a conical guide surface 432 is also provided at the opening of the positioning hole 431, and the conical guide surface 432 is arranged around the axis of the positioning hole 431. Specifically, the conical guide surface 432 refers to a curved surface formed by rotating one of two intersecting non-perpendicular straight lines around the other straight line. The bottom of the conical guide surface 432 is connected to the positioning hole 431, and the opening size of the conical guide surface 432 gradually decreases along the needle withdrawal direction of the winding needle 3. The setting of the conical guide surface 432 can provide guidance for the winding needle 3 when the winding needle 3 is inserted into the positioning hole 431, making it more convenient and quick to insert the winding needle 3 into the positioning hole 431, thereby improving the needle withdrawal efficiency of the winding needle 3 and also improving the battery cell production efficiency.

[0053] In one embodiment, see Figure 5A positioning column 433 is also provided in the positioning hole 431. The outer periphery of the positioning column 433 is spaced apart from the inner wall of the positioning hole 431. The positioning column 433 is used to cooperate with the inner wall of the positioning hole 431 to position the first petal body 31 and the second petal body 32. Specifically, the positioning column 433 refers to a columnar component with a certain length. The positioning column 433 is provided in the positioning hole 431, and the outer periphery of the positioning column 433 is spaced apart from the inner wall of the positioning hole 431. After the winding needle 3 is inserted into the positioning hole 431, it can be inserted between the first petal body 31 and the second petal body 32, and can cooperate with the inner wall of the positioning hole 431 to position the first petal body 31 and the second petal body 32 respectively, so that the rotation of the winding needle 3 is more stable.

[0054] Specifically, the end of the positioning column 433 close to the winding needle 3 is also provided with a tapered portion, and the provision of the tapered portion makes it easier for the positioning column 433 to be inserted between the first petal body portion 31 and the second petal body portion 32. In addition, a guide surface is provided at one end of the first petal body portion 31 and the second petal body portion 32 away from the rotating mounting portion 2. On the one hand, the guide surface can cooperate with the tapered portion to facilitate the positioning of the first petal body portion 31 and the second petal body portion 32; on the other hand, it can also make it easier and faster for the diaphragm and / or the pole piece to be inserted into the clamping gap 33 between the first petal body portion 31 and the second petal body portion 32 during the needle removal stage.

[0055] In one embodiment, see Figure 6 The pin bracket 42 includes a main mounting portion 421 spaced apart from the commutation frame 1, and a connecting pillar 422 connected between the main mounting portion 421 and the commutation frame 1, and the fixed core shaft 411 is rotatably arranged on the main mounting portion 421. Specifically, the main mounting portion 421 is spaced apart from the commutation frame 1, and a working area for cell winding is formed between the main mounting portion 421 and the commutation frame 1. The connecting pillar 422 connects the main mounting portion 421 with the pin bracket 42, so that the installation of the main mounting portion 421 is more stable and firm, and the space utilization rate of the entire device can also be more reasonable.

[0056] In one embodiment, see Figure 6, the number of winding needles 3, rotating mounting parts 2 and centering shafts 411 is multiple, and multiple centering shafts 411 are arranged at intervals around the connecting pillar 422. Specifically, the winding needle 3, the rotating mounting part 2 and the centering shaft 411 constitute a production unit for winding the battery cell. By forming multiple production units with multiple winding needles 3, multiple rotating mounting parts 2 and multiple centering shafts 411, multiple battery cells can be wound at the same time, thereby improving the production efficiency of the entire device. When the number of winding needles 3, the rotating mounting part 2 and the centering shaft 411 is multiple, the multiple winding needles 3, the rotating mounting part 2 and the centering shaft 411 are all arranged around the connecting pillar 422. The corresponding number of transmission mechanisms 5 and the connecting shafts 55 of multiple transmission mechanisms 5 can also be rotatably arranged on the connecting pillar 422, and the multiple connecting shafts 55 can be arranged at intervals around the connecting pillar 422, so that the structure of the entire battery cell winding device can be made more compact.

[0057] The connecting shaft 55 can be pressed onto the side of the connecting support 422 by a fixing block, and the fixing block can be pressed onto both ends of the connecting shaft 55 respectively, so that the installation of the connecting shaft 55 is more firm and convenient.

[0058] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery cell winding device, characterized in that: include: Reversing frame (1); A rotatable mounting portion (2) rotatably mounted on the reversing frame (1); A winding needle (3), the first end of which is connected to the rotating mounting portion (2) and is arranged along the rotating axis of the rotating mounting portion (2); the winding needle (3) is used to rotate under the drive of the rotating mounting portion (2) to wind the battery core; the winding needle (3) also has the freedom to extend and retract along the axial direction of the rotating mounting portion (2); A needle end positioning assembly (4), comprising a needle receiving bracket (42) and a positioning portion (41), wherein the needle receiving bracket (42) is relatively fixed to the reversing frame (1), and the positioning portion (41) is rotatably arranged on the needle receiving bracket (42), and the rotation axis of the positioning portion (41) is coaxially arranged with the rotation axis of the rotating mounting portion (2), and a positioning structure (43) is arranged on the positioning portion (41), and the positioning structure (43) is used to contact the second end of the winding needle (3) to maintain the stability of the winding needle (3); and The transmission mechanism (5) is used to transmission-connect the rotating mounting portion (2) and the positioning portion (41) so that the two rotate synchronously.

2. The battery core winding device according to claim 1, characterized in that: The transmission mechanism (5) comprises a first gear (51) arranged on the rotating mounting portion (2), a second gear (52) arranged on the positioning portion (41), a third gear (53) meshed with the first gear (51), a fourth gear (54) meshed with the second gear (52), and a connecting shaft (55) connected between the third gear (53) and the fourth gear (54), wherein the connecting shaft (55) is rotatably arranged on the pin holder (42), and a transmission ratio between the first gear (51) and the third gear (53) is equal to a transmission ratio between the first gear (51) and the third gear (53).

3. The battery core winding device according to claim 1 or 2, characterized in that: The winding needle (3) comprises a first petal body portion (31) and a second petal body portion (32), and a clamping gap (33) is provided between the first petal body portion (31) and the second petal body portion (32), and the clamping gap (33) is used for inserting a diaphragm and / or a battery electrode.

4. The battery core winding device according to claim 3, characterized in that: The rotating mounting portion (2) comprises a rotating cylinder (21), a first sliding portion (22) and a second sliding portion (23); the rotating cylinder (21) is movably connected to the reversing frame (1); the rotating cylinder (21) has the freedom to rotate around its own axis relative to the reversing frame (1); the first sliding portion (22) and the second sliding portion (23) are both arranged in the rotating cylinder (21); and the first sliding portion (22) and the second sliding portion (23) have the freedom to slide only along the axial direction of the rotating cylinder (21) relative to the rotating cylinder (21); the first petal portion (31) is connected to the first sliding portion (22); and the second petal portion (32) is connected to the second sliding portion (23).

5. The battery core winding device according to claim 4, characterized in that: The positioning portion (41) comprises a centering shaft (411), the centering shaft (411) is movably arranged on the needle receiving bracket (42), the centering shaft (411) has the freedom to rotate around its own axis relative to the needle receiving bracket (42), and the centering shaft (411) is coaxially arranged with the rotating cylinder (21).

6. The battery cell winding device according to claim 5, characterized in that: The positioning structure (43) comprises a positioning hole (431), and the positioning hole (431) is recessed on the end surface of the centering shaft (411) facing the winding needle (3). The positioning hole (431) is coaxially arranged with the centering shaft (411), and the positioning hole (431) is used to accommodate and position the second end of the winding needle (3).

7. The battery cell winding device according to claim 6, characterized in that: A conical guide surface (432) is also provided at the opening of the positioning hole (431), and the conical guide surface (432) is arranged around the axis of the positioning hole (431).

8. The battery cell winding device according to claim 7, characterized in that: A positioning column (433) is also provided in the positioning hole (431), and the outer periphery of the positioning column (433) is spaced apart from the inner wall of the positioning hole (431). The positioning column (433) is used to cooperate with the inner wall of the positioning hole (431) to position the first petal body portion (31) and the second petal body portion (32).

9. The battery cell winding device according to claim 5, characterized in that: The pin receiving bracket (42) comprises a main mounting portion (421) spaced apart from the reversing frame (1), and a connecting pillar (422) connected between the main mounting portion (421) and the reversing frame (1), and the centering shaft (411) is rotatably arranged on the main mounting portion (421).

10. The battery core winding device according to claim 9, characterized in that: The number of the winding needle (3), the rotating mounting portion (2) and the centering shaft (411) is multiple, and the multiple centering shafts (411) are arranged at intervals around the connecting pillar (422).

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