Battery cell winding device

Abstract

The utility model discloses a battery cell winding device. The battery cell winding device comprises a winding needle mechanism, a driving mechanism and a pushing assembly; the winding needle mechanism comprises an inner winding needle and an outer winding needle; the inner winding needle comprises a first inner winding needle and a second inner winding needle; the outer winding needle comprises a first outer winding needle and a second outer winding needle, the periphery of the first inner winding needle is sleeved with the first outer winding needle, and the periphery of the second inner winding needle is sleeved with the second outer winding needle; the driving mechanism comprises a first sliding block and a second sliding block; the second inner winding needle and the first outer winding needle are both connected with the first sliding block; the first inner winding needle and the second outer winding needle are both connected with the second sliding block. The pushing assembly is adopted to drive the first sliding block and the second sliding block to move oppositely, so that the first inner winding needle and the second inner winding needle are opened, and the first outer winding needle and the second outer winding needle are closed. The pushing assembly is adopted to drive the first sliding block and the second sliding block to move back to back, so that the first inner winding needle and the second inner winding needle are closed, and the first outer winding needle and the second outer winding needle are opened. And the outer winding needle and the inner winding needle can be opened or closed in a linkage manner.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell winding device. Background Art

[0002] The cell winding process is one of the important processes in the process of making batteries. In the cell winding process, the positive electrode sheet, separator, and negative electrode sheet are wound and extruded into a cylindrical, elliptical or square shape by a winding needle in a certain order.

[0003] However, the structure of the winding needle in the prior art is relatively complex and the manufacturing cost is relatively high. Therefore, how to simplify the structure of the winding needle and how to reduce the manufacturing cost of the winding needle have become the research directions of ordinary technicians in this field. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery cell winding device to solve the technical problems existing in the prior art of the complex internal structure of the winding needle, the high production cost and difficulty of the winding needle.

[0005] In order to achieve at least one of the above purposes, the present application provides the following technical solutions:

[0006] The present application provides a battery core winding device, which includes a winding needle mechanism and a driving mechanism;

[0007] The needle winding mechanism comprises:

[0008] Inwardly curled needles, the inwardly curled needles comprising a first inwardly curled needle and a second inwardly curled needle;

[0009] Externally rolled needles, the externally rolled needles comprising a first externally rolled needle and a second externally rolled needle, the first externally rolled needle being sleeved on the outer circumference of the first internally rolled needle, and the second externally rolled needle being sleeved on the outer circumference of the second internally rolled needle;

[0010] The driving mechanism comprises:

[0011] a first sliding block, the second inner winding needle and the first outer winding needle are both connected to the first sliding block;

[0012] a second slider, the first inner winding needle and the second outer winding needle are both connected to the second slider;

[0013] A pushing component, the first slider and the second slider are both connected to the pushing component;

[0014] The pushing assembly is used to drive the first slider and the second slider to move in opposite directions, so that the first inner rolling needle and the second inner rolling needle are closed, and the first outer rolling needle and the second outer rolling needle are opened;

[0015] The pushing assembly is also used to drive the first slider and the second slider to move toward each other so that the first inner rolling needle and the second inner rolling needle are opened, and the first outer rolling needle and the second outer rolling needle are closed.

[0016] In the above technical solution, the first inner winding needle and the second inner winding needle are opened and the first outer winding needle and the second outer winding needle are closed by using a push component to drive the first slider and the second slider to move in opposite directions, or the first inner winding needle and the second inner winding needle are closed and the first outer winding needle and the second outer winding needle are opened by using a push component to drive the first slider and the second slider to move in opposite directions. The linkage structure formed by the push component, the first slider and the second slider can make the outer winding needle and the inner winding needle open or close in linkage. The design of the linkage structure simplifies the internal structure of the winding needle mechanism, thereby reducing the production cost and difficulty of the winding needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is a rendering of the effect of the winding needle mechanism in the battery cell winding device provided in an embodiment of the present application before winding the battery cell;

[0019] Figure 2 This is a diagram showing the effect of a battery cell after the winding needle mechanism in the battery cell winding device provided in an embodiment of the present application has wound the battery cell;

[0020] Figure 3 for Figure 1 A cross-sectional view of the middle winding needle mechanism and the first driving member along the AA direction;

[0021] Figure 4 A schematic diagram of the structure of a guide rod in a battery cell winding device provided in an embodiment of the present application;

[0022] Figure 5 for Figure 3 A partial enlarged view of part C in the middle;

[0023] Figure 6 for Figure 1 A cross-sectional view of the positioning mechanism along the AA direction;

[0024] Figure 7 A schematic diagram of the three-dimensional structure of a winding needle mechanism in a battery cell winding device provided in an embodiment of the present application;

[0025] The reference numerals are as follows:

[0026] 1. Needle winding mechanism; 11. Inner needle winding; 111. Protrusion; 112. First inner needle winding; 113. Second inner needle winding; 12. Outer needle winding; 121. Groove; 122. First outer needle winding; 123. Second outer needle winding;

[0027] 2. driving mechanism; 21. first slider; 22. second slider; 23. pushing assembly; 231. housing; 232. elastic component; 233. cam follower; 234. guide rod; 2341. connecting end; 2342. free end; 23421. conical surface; 235. first driving member; 236. first bearing;

[0028] 3. A second driving member;

[0029] 4. Battery cells;

[0030] 5. Positioning mechanism; 51. Positioning pin; 511. First positioning surface; 512. Second positioning surface; 52. Third driving member; 53. Second bearing;

[0031] 6. The structure after the positive electrode sheet, separator and negative electrode sheet are stacked. DETAILED DESCRIPTION

[0032] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0034] The "embodiment" mentioned in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0035] The special word "exemplary" mentioned in this application means "used as an example, embodiment or illustrative". Any embodiment described as "exemplary" is not necessarily interpreted as being superior or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0036] In the description of this application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0037] In the description of this application, the technical term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside", "outside", "front", "back", "left", "right", "top", and "bottom" are orientations or positional relationships based on the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0039] In the description of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" 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, and 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 this application can be understood according to specific circumstances.

[0040] In the description of the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In the description of the present application, “plurality” means two or more (including two), unless otherwise clearly and specifically defined.

[0042] In the description of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0043] As part of the creative concept of the present application, before describing the embodiments of the present application, it is necessary to analyze the causes of the problems in the related art such as the complex internal structure of the winding needle, the high production cost and difficulty of the winding needle, and obtain the technical solution of the embodiments of the present application through reasonable analysis.

[0044] In the related art, two independent driving mechanisms are used to drive the opening and closing of the inner winding needle and the closing and opening of the outer winding needle. Among them, the use of two independent driving mechanisms to control the inner winding needle and the outer winding needle respectively makes the internal structure of the winding needle more complicated, and the production cost and difficulty of the winding needle are high. At the same time, because the two independent driving mechanisms control the inner winding needle and the outer winding needle respectively, there is a time difference in the movement of the inner winding needle and the outer winding needle, resulting in the incoordination between the structures of the battery cell winding device, which in turn affects the quality of the manufactured products.

[0045] To this end, the present application provides a battery cell winding device. The battery cell winding device includes a winding needle mechanism and a driving mechanism; wherein the winding needle mechanism includes an inner winding needle and an outer winding needle; the inner winding needle includes a first inner winding needle and a second inner winding needle; the outer winding needle includes a first outer winding needle and a second outer winding needle, the first outer winding needle is sleeved on the outer periphery of the first inner winding needle, and the second outer winding needle is sleeved on the outer periphery of the second inner winding needle; the driving mechanism includes a first slider, a second slider and a pushing component; the second inner winding needle and the first outer winding needle are both connected to the first slider; the first inner winding needle and the second outer winding needle are both connected to the second slider; the first slider and the second slider are both connected to the pushing component; wherein the pushing component is used to drive the first slider and the second slider to move in opposite directions so that the first inner winding needle and the second inner winding needle are closed, and the first outer winding needle and the second outer winding needle are opened; the pushing component is also used to drive the first slider and the second slider to move toward each other so that the first inner winding needle and the second inner winding needle are opened, and the first outer winding needle and the second outer winding needle are closed. This improves the technical problem in the prior art that two driving mechanisms drive the inner winding needle and the outer winding needle respectively, resulting in incoordination between the structures of the battery cell winding device, thereby affecting the quality of the manufactured products.

[0046] The technical solutions of the embodiments of the present application are described in detail below in conjunction with the accompanying drawings. The technical features involved in the different implementation modes of the present application described below can be combined with each other as long as there is no conflict between them.

[0047] To facilitate the description of the following embodiments, the present application takes a battery cell winding device in which the wound battery cell is cylindrical, elliptical or square as an example for explanation.

[0048] For reference Figure 1 and Figure 2 , Figure 1 This is a rendering of the effect of the winding needle mechanism in the battery cell winding device provided in the embodiment of the present application before winding the battery cell. Figure 2 This is a diagram showing the effect of a battery cell being wound by the winding needle mechanism in the battery cell winding device provided in an embodiment of the present application.

[0049] In the embodiment of the present application, a battery cell winding device is exemplified. The battery cell winding device includes a winding needle mechanism 1. The function of the winding needle mechanism 1 is to stack the positive electrode sheet, the separator, and the negative electrode sheet in a certain order and then wind them into a battery cell 4. Exemplarily, the order of stacking the positive electrode sheet, the separator, and the negative electrode sheet is the positive electrode sheet, the separator, and the negative electrode sheet, or the order of stacking the positive electrode sheet, the separator, and the negative electrode sheet is the negative electrode sheet, the separator, and the positive electrode sheet.

[0050] It should be noted that the positive electrode sheet in the embodiment of the present application specifically refers to an electrode sheet with a high potential containing an active substance that undergoes a reduction reaction during discharge. The positive electrode sheet is mainly composed of a positive active substance, a conductive agent, a binder, and a current collector. During the operation of the battery, the positive electrode sheet is responsible for storing and releasing ions to achieve the mutual conversion of electrical energy and chemical energy.

[0051] In the embodiment of the present application, the separator specifically refers to a thin film located between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to prevent energy loss due to direct reaction in the electrolytic cell.

[0052] In the present embodiment, the negative electrode sheet specifically refers to an electrode sheet with a high potential that contains an active substance that undergoes a reduction reaction during discharge. The negative electrode sheet is generally made of a negative electrode active material (such as graphite), a binder, a conductive agent, etc. coated on a current collector such as copper foil. The negative electrode sheet plays the role of receiving and storing ions during the charge and discharge process of the battery.

[0053] Specifically, the needle winding mechanism 1 includes an inner winding needle 11 and an outer winding needle 12. The inner winding needle 11 includes a first inner winding needle 112 and a second inner winding needle 113.

[0054] During the operation of the needle winding mechanism 1, the first inner winding needle 112 and the second inner winding needle 113 are opened, and the positive electrode sheet, the separator, and the negative electrode sheet are stacked in a certain order and placed between the first inner winding needle 112 and the second inner winding needle 113. After the positive electrode sheet, the separator, and the negative electrode sheet are stacked and placed between the first inner winding needle 112 and the second inner winding needle 113, the first inner winding needle 112 and the second inner winding needle 113 are closed to clamp the positive electrode sheet, the separator, and the negative electrode sheet.

[0055] The outer winding needle 12 includes a first outer winding needle 122 and a second outer winding needle 123. The first outer winding needle 122 is sleeved on the outer circumference of the first inner winding needle 112, and the second outer winding needle 123 is sleeved on the outer circumference of the second inner winding needle 113.

[0056] During the operation of the winding needle mechanism 1, the first inner winding needle 112 and the second inner winding needle 113 close and clamp the positive electrode sheet, the diaphragm and the negative electrode sheet, while the first outer winding needle 122 and the second outer winding needle 123 open. Then, the winding needle mechanism 1 rotates to wind the positive electrode sheet, the diaphragm and the negative electrode sheet onto the outer peripheral surface of the outer winding needle 12.

[0057] refer to Figure 3 , Figure 3 for Figure 1 A cross-sectional view of the middle winding needle mechanism and the first driving member along the AA direction.

[0058] The battery cell winding device further includes a driving mechanism 2 .

[0059] Specifically, the driving mechanism 2 includes a first slider 21 and a second slider 22. The specific structures of the first slider 21 and the second slider 22 are not limited in the embodiment of the present application, and the structures capable of moving in opposite directions and in opposite directions are sufficient.

[0060] As an optional solution, the second inner winding needle 113 and the first outer winding needle 122 are both connected to the first slider 21 , and the first inner winding needle 112 and the second outer winding needle 123 are both connected to the second slider 22 .

[0061] As another optional solution, the second inner winding needle 113 and the first outer winding needle 122 are both connected to the second slider 22 , and the first inner winding needle 112 and the second outer winding needle 123 are both connected to the first slider 21 .

[0062] The driving mechanism 2 further includes a pushing component 23. The pushing component 23 is used to drive the first slider 21 and the second slider 22 to move toward each other or move away from each other. Specifically, the first slider 21 and the second slider 22 are both connected to the pushing component 23.

[0063] During the operation of the cell winding device, the push assembly 23 drives the first slider 21 and the second slider 22 to move in opposite directions, so that the first inner winding needle 112 and the second inner winding needle 113 are closed to clamp the positive electrode sheet, the separator, and the negative electrode sheet stacked between the first inner winding needle 112 and the second inner winding needle 113. The first outer winding needle 122 and the second outer winding needle 123 are opened to provide a support surface for winding the cell 4. Then the cell 4 is wound and the cell 4 is wound on the outer peripheral surface of the outer winding needle 12.

[0064] After the winding of the battery cell 4 is completed, the push assembly 23 drives the first slider 21 and the second slider 22 to move toward each other so that the first inner winding needle 112 and the second inner winding needle 113 are opened to release the clamping of the positive electrode sheet, the separator, and the negative electrode sheet. The first outer winding needle 122 and the second outer winding needle 123 are closed to separate from the battery cell 4, so as to facilitate the subsequent winding needle mechanism 1 to withdraw from the interior of the battery cell 4.

[0065] In the above technical solution, by setting a pushing component 23, the opening of the first inner winding needle 112 and the second inner winding needle 113 and the closing of the first outer winding needle 122 and the second outer winding needle 123 can be controlled in a linked manner, and the closing of the first inner winding needle 112 and the second inner winding needle 113 and the opening of the first outer winding needle 122 and the second outer winding needle 123 can be controlled in a linked manner, so that the inner winding needle 11 and the outer winding needle 12 can act at the same time and be closely connected, thereby reducing the error of winding the battery cell 4 and improving the quality of the battery cell. At the same time, compared with the structure in the prior art that uses two sets of driving mechanisms to control the opening and closing of the inner winding needle 11 and the closing and opening of the outer winding needle 12 respectively, the pushing component 23 of the present application has a more ingenious structure, simplifies the complex internal structure, and reduces the production cost and maintenance cost of the battery cell winding device.

[0066] In the embodiment of the present application, the pushing assembly 23 includes a housing 231. The housing 231 is used to place other structures.

[0067] Specifically, a first slider 21 and a second slider 22 are disposed inside the housing 231, and the first slider 21 and the second slider 22 can slide back and forth along a first direction inside the housing 231. Figure 3 The first direction is shown as the arrangement direction of the first slider 21 and the second slider 22 .

[0068] The pushing assembly 23 further includes an elastic component 232, and the number of the elastic components 232 is multiple. Among them, the multiple elastic components 232 in the embodiment of the present application specifically refer to two or more elastic components 232, such as: two elastic components 232, three elastic components 232, four elastic components 232, five elastic components 232, six elastic components 232, seven elastic components 232, eight elastic components 232, etc. In the embodiment of the present application, the number of elastic components 232 is four as an example for description.

[0069] At least one elastic component 232 is disposed between the inner wall of the housing 231 and the side of the first slider 21 away from the second slider 22. In the embodiment of the present application, at least one elastic component 232 specifically refers to one or more elastic components 232, such as one elastic component 232, two elastic components 232, three elastic components 232, four elastic components 232, five elastic components 232, six elastic components 232, seven elastic components 232, eight elastic components 232, etc. In the embodiment of the present application, two elastic components 232 are disposed between the inner wall of the housing 231 and the side of the first slider 21 away from the second slider 22 as an example for description.

[0070] At least one elastic component 232 is disposed between the inner wall of the housing 231 and the side of the second slider 22 away from the first slider 21. In the embodiment of the present application, two elastic components 232 are disposed between the inner wall of the housing 231 and the side of the second slider 22 away from the first slider 21 as an example for description.

[0071] The pushing assembly 23 further includes two cam followers 233 , and the two cam followers 233 are disposed on the first slider 21 and the second slider 22 in a one-to-one correspondence.

[0072] The push assembly 23 further includes a guide rod 234. The guide rod 234 can extend between the two cam followers 233 along its axial direction to increase the distance between the two cam followers 233 and drive the first slider 21 and the second slider 22 to move in opposite directions against the force of the elastic component 232.

[0073] During the operation of the push assembly 23, the guide rod 234 extends along its own axial direction between the two cam followers 233, so that the distance between the two cam followers 233 increases, and drives the first slider 21 and the second slider 22 to move in opposite directions to overcome the force of the elastic component 232, and then the first inner winding needle 112 and the second inner winding needle 113 are closed to clamp the positive electrode sheet, the diaphragm, and the negative electrode sheet. At the same time, the first outer winding needle 122 and the second outer winding needle 123 are opened to support the battery cell 4 wound later.

[0074] After the winding of the battery cell 4 is completed, the guide rod 234 moves away from the two cam followers 233 along its own axial direction, so that the distance between the two cam followers 233 is reduced. The elastic component 232 disposed between the inner wall of the housing 231 and the side of the first slider 21 away from the second slider 22 releases elastic potential energy from a compressed state to act on the first slider 21, and the elastic component 232 disposed between the inner wall of the housing 231 and the side of the second slider 22 away from the first slider 21 releases elastic potential energy from a compressed state to act on the second slider 22, so that the first slider 21 and the second slider 22 move toward each other, and then the first inner winding needle 112 and the second inner winding needle 113 open, releasing the clamping of the positive electrode sheet, the diaphragm, and the negative electrode sheet. At the same time, the first outer winding needle 122 and the second outer winding needle 123 are closed to separate from the battery cell 4, so as to facilitate the subsequent winding needle mechanism 1 to withdraw from the interior of the battery cell 4.

[0075] By setting a guide rod 234 that extends along its own axial direction between the two cam followers 233, the first slider 21 and the second slider 22 are driven to move in opposite directions to overcome the force of the elastic component 232, thereby driving the closing of the first inner curling needle 112 and the second inner curling needle 113 and the opening of the first outer curling needle 122 and the second outer curling needle 123.

[0076] The guide rod 234 is arranged to leave between the two cam followers 233 along its own axial direction. Under the action of the elastic component 232, the first slider 21 and the second slider 22 move toward each other, thereby driving the opening of the first inner winding needle 112 and the second inner winding needle 113 and the closing of the first outer winding needle 122 and the second outer winding needle 123.

[0077] refer to Figure 4 , Figure 4 A schematic diagram of the structure of a guide rod in a battery cell winding device provided in an embodiment of the present application.

[0078] In the embodiment of the present application, two ends of the guide rod 234 along its own axial direction are respectively a connecting end 2341 and a free end 2342 .

[0079] The pushing assembly 23 also includes a first driving member 235. The specific structure of the first driving member 235 is not limited in the embodiment of the present application, and any structure that can drive the guide rod 234 to move, such as: an oil cylinder, a pneumatic cylinder, a telescopic rod, etc. In the embodiment of the present application, the specific structure of the first driving member 235 is a pneumatic cylinder as an example for description.

[0080] Specifically, the output end of the first driving member 235 is rotatably connected to the connecting end 2341 , and the first driving member 235 can drive the guide rod 234 to reciprocate along its own axial direction, so that the free end 2342 can extend into or leave between the two cam followers 233 .

[0081] refer to Figure 5 , Figure 5 for Figure 3 A partial enlarged view of part C.

[0082] The push assembly 23 also includes a first bearing 236. The specific structure of the first bearing 236 is not limited in the embodiment of the present application, and can be any structure that enables the inner ring and the outer ring of the bearing to rotate at different times or at different speeds, such as a deep groove ball bearing, a self-aligning ball bearing, a cylindrical roller bearing, a self-aligning roller bearing, a needle roller bearing, an angular contact ball bearing, a tapered roller bearing, etc. In the embodiment of the present application, the specific structure of the first bearing 236 is a cylindrical roller bearing as an example for description.

[0083] The first bearing 236 is disposed between the output end of the first driving member 235 and the connecting end 2341 of the guide rod 234 to achieve a rotational connection between the first driving member 235 and the guide rod 234 .

[0084] Specifically, the outer ring of the first bearing 236 is fixedly connected to the output end of the first driving member 235, and the inner ring of the first bearing 236 is fixedly connected to the guide rod 234. It is achieved that the inner ring of the first bearing 236 can rotate together with the connecting end 2341 of the guide rod 234, the first driving member 235 can drive the guide rod 234 to reciprocate along the axial direction of the guide rod 234, and the output end of the first driving member 235 does not rotate or rotates at a low speed, thereby ensuring the normal operation of the first driving member 235.

[0085] It should be understood that the inner ring of the first bearing 236 can also be fixedly connected to the output end of the first driving member 235, and the outer ring of the first bearing 236 can be fixedly connected to the guide rod 234. The outer ring of the first bearing 236 can rotate together with the connecting end 2341 of the guide rod 234.

[0086] In the embodiment of the present application, the free end 2342 is provided with a conical surface 23421 .

[0087] When the guide rod 234 extends between the two cam followers 233 , the two cam followers 233 first come into contact with the conical surface 23421 .

[0088] The tapered surface 23421 is provided on the free end 2342, so that it can play a guiding role in the relative movement between the two cam followers 233 and the guide rod 234. The tapered surface 23421 is arranged to be inclined along the axial direction of the guide rod 234. When the guide rod 234 extends between the two cam followers 233, the distance between the two cam followers 233 can be increased. When the guide rod 234 leaves between the two cam followers 233, the distance between the two cam followers 233 can be decreased.

[0089] In the embodiment of the present application, the battery cell winding device further includes a second driving member 3. The specific structure of the second driving member 3 is not limited in the embodiment of the present application, and it can be a structure capable of driving the housing 231 and the first slider 21 and the second slider 22 inside the housing 231 to rotate, such as a brushed DC motor, an electromagnetic DC motor, a permanent magnet DC motor, etc. In the embodiment of the present application, the specific structure of the second driving member 3 is a brushed DC motor as an example for description.

[0090] Specifically, the output end of the second driving member 3 is connected to the housing 231 to drive the housing 231 and the first slider 21 and the second slider 22 inside the housing 231 to rotate, and drive the needle winding mechanism 1 to rotate.

[0091] refer to Figure 6 , Figure 6 for Figure 1 Cross-sectional view of the positioning mechanism along the AA direction.

[0092] The battery cell winding device in the embodiment of the present application further includes a positioning mechanism 5. The positioning mechanism 5 is used to fix one end of the winding needle mechanism 1 away from the driving mechanism 2, so that the winding needle mechanism 1 rotates relatively stably along the axis of the winding needle mechanism 1 during the process of winding the battery cell 4, and does not vibrate significantly, resulting in the wound battery cell 4 being loose and wrinkled.

[0093] Specifically, the positioning mechanism 5 includes a positioning pin 51. The positioning pin 51 is used to fix the inner winding needle 11 and the outer winding needle 12. The positioning pin 51 is arranged on a side of the winding needle mechanism 1 away from the driving mechanism 2.

[0094] The positioning pin 51 has a first positioning surface 511 and a second positioning surface 512. The first positioning surface 511 is used for positioning and assembling with the side of the inner winding needle 11 away from the driving mechanism 2. The second positioning surface 512 is used for positioning and assembling with the side of the outer winding needle 12 away from the driving mechanism 2.

[0095] The positioning mechanism 5 also includes a third driving member 52. The specific structure of the third driving member 52 is not limited in the embodiment of the present application, and it can be a structure that can drive the positioning pin 51 to move toward or away from the needle winding mechanism 1, such as: a hydraulic cylinder, a pneumatic cylinder, a telescopic rod, etc. In the embodiment of the present application, the specific structure of the third driving member 52 is a pneumatic cylinder as an example for description.

[0096] The third driving member 52 is provided to drive the positioning pin 51 to move toward or away from the needle winding mechanism 1, so that the positioning pin 51 can be positioned and assembled with the inner winding needle 11 and the outer winding needle 12 or released from the positioning and assembly.

[0097] refer to Figure 7 , Figure 7A schematic diagram of the three-dimensional structure of the winding needle mechanism in the battery cell winding device provided in an embodiment of the present application.

[0098] In the embodiment of the present application, a ring structure is provided on one side of the positioning pin 51 close to the needle winding mechanism 1 , wherein the inner circumference of the ring structure is the first positioning surface 511 , and the outer circumference of the ring structure is the second positioning surface 522 .

[0099] A protrusion 111 is provided on the side of the inner winding needle 11 away from the driving mechanism 2 . When the first inner winding needle 112 and the second inner winding needle 113 are in a closed state, the outer peripheral surface of the protrusion 111 can be positioned and assembled with the first positioning surface 511 .

[0100] A groove 121 is provided on the side of the outer winding needle 12 away from the driving mechanism 2 . When the first outer winding needle 122 and the second outer winding needle 123 are in an open state, the inner circumferential surface of the groove 121 can be positioned and assembled with the second positioning surface 512 .

[0101] By setting the side of the positioning pin 51 close to the needle winding mechanism 1 to be a ring structure, the positioning pin 51 and the needle winding mechanism 1 can be positioned and assembled by rotating relative to each other to any angle, thereby reducing the difficulty of installing the positioning pin 51 and the difficulty of positioning the positioning pin 51 and the needle winding mechanism 1.

[0102] The positioning mechanism 5 also includes a second bearing 53. The specific structure of the second bearing 53 is not limited in the embodiment of the present application, and can be any structure that enables the inner ring and the outer ring of the bearing to rotate at different times or at different speeds, such as a deep groove ball bearing, a self-aligning ball bearing, a cylindrical roller bearing, a self-aligning roller bearing, a needle roller bearing, an angular contact ball bearing, a tapered roller bearing, etc. In the embodiment of the present application, the specific structure of the second bearing 53 is a cylindrical roller bearing as an example for description.

[0103] The second bearing 53 is disposed between the output end of the third driving member 52 and the end of the positioning pin 51 away from the needle winding mechanism 1 , so as to realize the rotational connection between the third driving member 52 and the positioning pin 51 .

[0104] Specifically, the outer ring of the second bearing 53 is fixedly connected to the output end of the third driving member 52 , the inner ring of the second bearing 53 is fixedly connected to the positioning pin 51 , and the inner ring of the second bearing 53 and the positioning pin 51 rotate simultaneously.

[0105] By arranging a second bearing 53 between the output end of the third driving member 52 and the end of the positioning pin 51 away from the needle winding mechanism 1, the inner ring of the second bearing 53 rotates together with the positioning pin 51, and the outer ring of the second bearing 53 does not rotate or rotates at a low speed. Therefore, the output end of the third driving member 52 connected to the outer ring of the second bearing 53 does not rotate or rotates at a low speed, thereby ensuring the normal operation of the third driving member 52.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell winding device, characterized in that: It includes a needle winding mechanism and a driving mechanism; The needle winding mechanism comprises: Inwardly curled needles, the inwardly curled needles comprising a first inwardly curled needle and a second inwardly curled needle; Externally rolled needles, the externally rolled needles comprising a first externally rolled needle and a second externally rolled needle, the first externally rolled needle being sleeved on the outer circumference of the first internally rolled needle, and the second externally rolled needle being sleeved on the outer circumference of the second internally rolled needle; The driving mechanism comprises: a first sliding block, the second inner winding needle and the first outer winding needle are both connected to the first sliding block; a second slider, the first inner winding needle and the second outer winding needle are both connected to the second slider; A pushing component, the first slider and the second slider are both connected to the pushing component; The pushing assembly is used to drive the first slider and the second slider to move in opposite directions, so that the first inner rolling needle and the second inner rolling needle are closed, and the first outer rolling needle and the second outer rolling needle are opened; The pushing assembly is also used to drive the first slider and the second slider to move toward each other so that the first inner rolling needle and the second inner rolling needle are opened, and the first outer rolling needle and the second outer rolling needle are closed.

2. The battery core winding device according to claim 1, characterized in that: The pushing component comprises: A housing, wherein the first slider and the second slider are disposed inside the housing, and the first slider and the second slider can slide back and forth along a first direction inside the housing; wherein the first direction is an arrangement direction of the first slider and the second slider; An elastic component, wherein the number of the elastic components is plural, at least one of the elastic components is arranged between the inner wall of the housing and a side of the first slider away from the second slider, and at least one of the elastic components is arranged between the inner wall of the housing and a side of the second slider away from the first slider; Cam followers, the number of the cam followers is two, and the two cam followers are arranged on the first slider and the second slider in a one-to-one correspondence; A guide rod, wherein the guide rod can extend into between the two cam followers along its own axial direction to increase the distance between the two cam followers and drive the first slider and the second slider to move in opposite directions to overcome the action force of the elastic component.

3. The battery core winding device according to claim 2, characterized in that: The two ends of the guide rod along its own axial direction are respectively a connecting end and a free end; The pushing assembly also includes a first driving member; the output end of the first driving member is rotatably connected to the connecting end, and the first driving member can drive the guide rod to reciprocate along its own axial direction so that the free end can extend into or leave between the two cam followers.

4. The battery core winding device according to claim 3, characterized in that: The pushing assembly further includes a first bearing; The first bearing is disposed between the output end of the first driving member and the connecting end of the guide rod, so as to realize the rotational connection between the first driving member and the guide rod.

5. The battery core winding device according to claim 3, characterized in that: The free end is provided with a conical surface; When the guide rod extends between the two cam followers, the two cam followers first contact the conical surface.

6. The battery core winding device according to claim 2, characterized in that: The battery core winding device also includes a second driving member; The output end of the second driving member is connected to the housing to drive the housing and the first slider and the second slider inside the housing to rotate, and drive the needle winding mechanism to rotate.

7. The battery core winding device according to any one of claims 1 to 6, characterized in that: The battery core winding device also includes a positioning mechanism; The positioning mechanism comprises: A positioning pin, the positioning pin is arranged on a side of the needle winding mechanism away from the driving mechanism, the positioning pin has a first positioning surface and a second positioning surface, the first positioning surface is used for positioning and assembling with the side of the inner needle winding mechanism away from the driving mechanism, and the second positioning surface is used for positioning and assembling with the side of the outer needle winding mechanism away from the driving mechanism; A third driving member is used to drive the positioning pin to move toward or away from the needle winding mechanism, so that the positioning pin can be positioned or released with the inner winding needle and the outer winding needle at the same time.

8. The battery cell winding device according to claim 7, characterized in that: A ring structure is provided on one side of the positioning pin close to the needle winding mechanism; The inner circumference of the annular structure is the first positioning surface, and the outer circumference of the annular structure is the second positioning surface; A protrusion is provided on a side of the inner winding needle away from the driving mechanism, and when the first inner winding needle and the second inner winding needle are in a closed state, the outer peripheral surface of the protrusion can be positioned and assembled with the first positioning surface; A groove is provided on a side of the outer winding needle away from the driving mechanism, and when the first outer winding needle and the second outer winding needle are in an open state, the inner circumferential surface of the groove can be positioned and assembled with the second positioning surface.

9. The battery cell winding device according to claim 7, characterized in that: The positioning mechanism also includes a second bearing; The second bearing is arranged between the output end of the third driving member and an end of the positioning pin away from the needle winding mechanism, so as to realize the rotational connection between the third driving member and the positioning pin.

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