Cell Winding Device and Winding Machine

Abstract

The present invention provides a battery cell winding device and a winding machine. The battery cell winding device includes: a driving mechanism including a rotational output part; a transmission mechanism connected to the rotational output part; a winding needle assembly connected to the transmission mechanism; and a limiting mechanism connected to the transmission mechanism, such that the transmission mechanism outputs a rotational motion to drive the winding needle assembly to rotate, or the transmission mechanism outputs a linear motion to drive the winding needle assembly to move axially. The battery cell winding device and the winding machine adopt a structure where the driving mechanism is connected to the winding needle assembly through the transmission mechanism, and the limiting mechanism is selectively connected to the transmission mechanism, enabling a single set of driving mechanism to achieve the switching between the rotation and linear motion of the winding needle assembly, thereby simplifying the driving logic and saving installation space.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and particularly to a core winding device and a winding machine. Background Art

[0002] Lithium-ion batteries have the advantages of high energy, small size, long storage life, and no pollution, and are widely used in power batteries and mobile phone batteries. In the production process of lithium batteries, the production of the battery core needs to be completed at the winding station, the gluing station, and the blanking station of the winding machine in sequence.

[0003] In the related prior art, for the winding station, a separate winding motor is set for driving to realize the winding of the battery core, and for the blanking station, a separately set blanking motor is used to realize the blanking push needle of the winding needle, so that the driving logic is relatively complex, and setting multiple servo drives also brings the problem of requiring a large installation space. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that a set of driving mechanisms need to be equipped for winding and blanking respectively, resulting in a complex driving logic, and thus provide a core winding device and a winding machine using a single drive.

[0005] To solve the above problems, the present invention provides a core winding device, including: a driving mechanism including a rotation output part; a transmission mechanism connected to the rotation output part; a winding needle assembly connected to the transmission mechanism; a limiting mechanism connected to the transmission mechanism, such that the transmission mechanism outputs a rotational motion to drive the winding needle assembly to rotate, or the transmission mechanism outputs a linear motion to drive the winding needle assembly to move axially.

[0006] Optionally, the transmission mechanism includes: a lead screw; a nut threadedly connected to the lead screw and rotatable; a slider connected to the lead screw; wherein the rotation output part is connected to the nut to drive the nut to rotate, the winding needle assembly is rotatably connected to the slider, and the limiting mechanism includes a first limiting module and a second limiting module that can be switched to rotate synchronously with the lead screw or move axially synchronously with the lead screw.

[0007] Optionally, both the first limiting module and the second limiting module include a shaft-holding brake, the first limiting module is connected to the nut, and the second limiting module is connected to the slider.

[0008] Optionally, the transmission mechanism further includes: a driving gear connected to the rotation output part; a driven gear meshing with the driving gear, and the nut is connected to the driven gear.

[0009] Optionally, the cell winding device further includes: a control system communicatively connected to the first limiting module and the second limiting module to control the first limiting module or the second limiting module to hold the lead screw tightly.

[0010] Optionally, the cell winding device further includes: a guiding mechanism connected to the transmission mechanism to guide the linear motion output by the transmission mechanism.

[0011] Optionally, the guiding mechanism includes: a first guiding rod passing through the slider; a second guiding rod passing through the slider, and the second guiding rod is disposed opposite to the first guiding rod.

[0012] Optionally, the cell winding device further includes: a first support seat having a first mounting through hole; a second support seat spaced apart from and opposite to the first support seat; wherein, the first limiting module is disposed in the first mounting through hole, the lead screw passes through the first limiting module and the first mounting through hole, and there is a gap between the lead screw and the first mounting through hole, and a connecting portion is disposed in the gap, and the connecting portion connects the first limiting module and the nut.

[0013] Optionally, the winding needle assembly includes: a winding needle mechanism including a plurality of winding needle bodies; a connecting member connected to the winding needle mechanism, and the connecting member is rotatably connected to the slider; wherein, the second limiting module is connected to an end of the slider and partially sleeved outside the connecting member, and a spacer block is disposed in an annular gap between the second limiting module and the connecting member.

[0014] The present invention also provides a winding machine, including: the winding device as described above; a unwinding device configured to feed a cell winding material to the winding device for winding to form a cell; a blanking device configured to remove and blank the formed cell from the winding device.

[0015] The present invention has the following advantages:

[0016] 1. By using the technical solution of the present invention, the driving mechanism is connected to the winding needle assembly through the transmission mechanism, and the limiting mechanism is selectively connected to the transmission mechanism, so that an independent set of driving mechanisms can realize the switching between the rotation and linear motion of the winding needle assembly, thereby simplifying the driving logic and saving installation space.

[0017] 2. The shaft holding brake is adopted to realize the rotation or linear motion of the lead screw driving the winding assembly, and the reliability is high.

[0018] 3. The linear motion direction of the slider is guided by the relatively arranged first guiding rod and second guiding rod, which can balance the radial load generated by the lead screw during linear motion and improve the service life of the lead screw. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of a partial cross-sectional three-dimensional structure of a battery cell winding device in an embodiment of the present invention;

[0021] Figure 2 For Figure 1 the enlarged structure schematic diagram at position A in

[0022] Figure 3 For Figure 1 the enlarged structure schematic diagram at position B in

[0023] Figure 4 For Figure 1 the enlarged structure schematic diagram at position C in

[0024] Explanation of reference numerals:

[0025] 100, battery cell winding device; 101, spacer block; 110, driving mechanism; 111, servo motor; 113, first conductive slip ring; 115, second conductive slip ring; 120, transmission mechanism; 121, lead screw; 123, nut; 125, slider; 127, driven gear; 129, driving gear; 130, limiting mechanism; 131, first limiting module; 133, second limiting module; 140, winding needle assembly; 141, winding needle mechanism; 142, connecting member; 150, guiding mechanism; 151, first guiding rod; 153, second guiding rod; 160: first support seat; 161: first mounting through hole; 170, second support seat; 171, second mounting through hole; 180, third support seat. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Application overview

[0028] In the related prior art, the blanking push pin of the winding needle of the winding machine is driven by an independent motor, and the push-pull needle adopts a lead screw mechanism. A slider is arranged on the lead screw to cooperate with the guide rail for sliding, and the slider is threadedly connected to the lead screw, so that when the push-pull needle is operated, the lead screw is subjected to partial radial load, affecting the service life of the lead screw.

[0029] Exemplary battery cell winding device

[0030] As Figure 1 shown, the battery cell winding device 100 includes: a driving mechanism 110, a transmission mechanism 120, a winding needle assembly 140 and a limiting mechanism 130. The driving mechanism 110 includes a rotational output portion. The transmission mechanism 120 is connected to the rotational output portion. The winding needle assembly 140 is connected to the transmission mechanism 120. The limiting mechanism 130 is connected to the transmission mechanism 120, so that the transmission mechanism 120 outputs a rotational motion to drive the winding needle assembly 140 to rotate, or the transmission mechanism 120 outputs a linear motion to drive the winding needle assembly 140 to move axially.

[0031] The above-mentioned driving mechanism 110 outputs a rotational motion through the rotational output portion. The rotational output portion is connected to the transmission mechanism 120, and can drive the transmission mechanism 120 to output a rotational motion or a linear motion. Through the connection between the transmission mechanism 120 and the winding needle assembly 140, and the cooperation between the limiting mechanism 130 and the transmission mechanism 120, the driving mechanism 110 can drive the winding needle assembly 140 to rotate or drive the winding needle assembly 140 to perform a linear motion through the transmission mechanism 120. When the winding needle assembly 140 rotates, the winding of the battery cell can be completed, and when the winding needle assembly 140 moves linearly, the push-pull needle operation of the winding needle assembly 140 can be realized. Therefore, through the cooperation between the limiting mechanism 130 and the transmission mechanism 120, the driving mechanism 110 can realize the rotation or linear motion of the winding needle assembly 140, and the winding device can realize pulling, pushing and winding through a single drive.

[0032] Continuing to combine with Figure 1 shown, the transmission mechanism 120 includes: a lead screw 121, a nut 123 and a slider 125. The nut 123 is threadedly connected to the lead screw 121 and the nut 123 is rotatable. Among them, the rotational output portion is connected to the nut 123 to drive the nut 123 to rotate. The winding needle assembly 140 is connected to the lead screw 121, and the winding needle assembly 140 is rotatably connected to the slider 125. The limiting mechanism 130 includes a first limiting module 131 and a second limiting module 133. The first limiting module 131 is connected to the nut 123. The second limiting module 133 is connected to the slider 125 and the winding needle assembly 140, and the first limiting module 131 and the second limiting module 133 are selectively connected to the lead screw 121.

[0033] The above-mentioned lead screw 121 is threadedly connected to the nut 123. The rotation output part drives the nut 123 to rotate. When the first limiting module 131 is connected to the lead screw 121, the second limiting module 133 is not connected to the lead screw 121. Since the second limiting block is connected to the slider 125, the slider 125 is not connected to the lead screw 121. When the nut 123 rotates, the lead screw 121 and the nut 123 rotate synchronously. When the lead screw 121 rotates, the winding needle assembly 140 connected to the lead screw 121 rotates synchronously with the lead screw 121. The rotation of the winding needle assembly 140 can realize the winding of the battery cell. When the second limiting module 133 is connected to the lead screw 121, the slider 125 is connected to the lead screw 121. At this time, the first limiting module 131 is not connected to the lead screw 121. When the lead screw 121 rotates, it will drive the winding needle assembly 140 to have a rotating tendency. However, since the second limiting module 133 restricts the rotating tendency of the winding needle assembly 140, the lead screw 121 can convert the rotational motion into a linear motion to drive the winding needle assembly 140. Therefore, the rotation or linear motion of the winding needle assembly 140 is realized by a single drive, enabling the winding needle assembly 140 to switch between rotational motion and linear motion under the combined action of the drive mechanism 110, the lead screw 121, the nut 123, the first limiting module 131, the second limiting module 133, and the slider 125.

[0034] As Figure 2 shown, the transmission mechanism 120 further includes: a driving gear 129 and a driven gear 127. The driving gear 129 is connected to the rotation output part, the driven gear 127 meshes with the driving gear 129, and the nut 123 is connected to the driven gear 127.

[0035] The above-mentioned driven gear 127 is rotatably connected to the third support seat 180. The driving gear 129 rotates synchronously with the rotation output part. The driven gear 127 is driven to rotate synchronously through the meshing of the driving gear 129 and the driven gear 127. At least part of the nut 123 is connected to the driven gear 127, so that the nut 123 can rotate synchronously with the driven gear 127.

[0036] The battery cell winding device further includes: a control system. The control system is communicatively connected to the first limiting module 131 and the second limiting module 133 to control the first limiting module 131 or the second limiting module 133 to hold the lead screw 121 tightly.

[0037] The above control system can control the first limit module 131 to hold the lead screw 121 tightly while the second limit module 133 releases the lead screw 121 according to the input command, so that the lead screw 121 can drive the needle winding assembly 140 to rotate synchronously. Similarly, the control system can also control the second limit module 133 to hold the lead screw 121 tightly while the first limit module 131 releases the lead screw 121 according to the input command, so that the lead screw 121 can drive the needle winding assembly 140 to move linearly. The control system can be the control system of the battery cell winding device or can be set separately.

[0038] Both the first limit module 131 and the second limit module 133 are shaft holding brakes. The shaft holding brake can limit the rotation of the lead screw by holding or releasing the lead screw 121, and has high reliability.

[0039] Combined with Figure 1 and Figure 2 As shown in the figure, the battery cell winding device further includes: a guiding mechanism 150, and the guiding mechanism 150 is connected to the transmission mechanism 120 to guide the linear motion output by the transmission mechanism 120.

[0040] The above transmission mechanism 120 is connected to the needle winding assembly 140, and the guiding mechanism 150 guides the linear motion of the transmission mechanism 120, that is, guides the linear motion of the needle winding assembly 140, so as to ensure that the needle winding assembly 140 can extend or retract axially.

[0041] As Figure 2 shown, the guiding mechanism 150 includes: a first guiding rod 151 and a second guiding rod 153. The first guiding rod 151 penetrates through the slider 125, the second guiding rod 153 penetrates through the slider 125, and the second guiding rod 153 is arranged opposite to the first guiding rod 151.

[0042] The above first guiding rod 151 and second guiding rod 153 are arranged opposite to each other, which can limit the rotation of the slider 125. The slider 125 is provided with two through holes, and the centers of the two through holes are on the same straight line. The first guiding rod 151 and the second guiding rod 153 are respectively in clearance fit with the through holes.

[0043] Continuing to combine with Figure 1 shown, the battery cell winding device further includes: a first support seat 160 and a second support seat 170. The first support seat 160 has an installation through hole, and the second support seat 170 is spaced apart from and opposite to the first support seat 160. Among them, the combined first limit module 131 is arranged in the first installation through hole 161, the lead screw 121 penetrates through the first limit module 131 and the first installation through hole 161, and there is a gap between the lead screw 121 and the first installation through hole 161. A connecting part is arranged in the gap, and the connecting part connects the first limit module 131 and the nut 123.

[0044] The above-mentioned first support base 160 and second support base 170 are respectively rotatable. Therefore, the battery cells connected to the first support base 160 and the second support base 170 enable the battery cell winding device to rotate itself to achieve the switching of workstations. The battery cell winding device further includes a third support base 180. One end of the nut 123 is rotatably connected to the first support base 160, and the other end of the nut 123 is rotatably connected to the third support base 180. As Figure 4 shown, a second mounting through-hole 171 is provided on the second support base 170. The winding needle assembly 140 partially passes through the second mounting through-hole 171 and is slidably connected to the slider 125. The second mounting through-hole 171 plays a role in supporting and guiding the winding needle assembly 140. One end of the lead screw 121 is connected to the winding needle assembly 140, and the other end of the lead screw 121 is connected to the nut 123. The first mounting through-hole 161 is a stepped hole. The first limiting module 131 is disposed in the large-diameter hole of the first mounting through-hole 161. The nut 123 is partially located in the small-diameter hole of the first mounting hole and is rotatable. The lead screw 121 passes through the first limiting module 131 and is connected to the nut 123. The first limiting module 131 is connected to the nut 123 through a connecting portion. When the first limiting module 131 clamps the lead screw 121 and the second limiting module 133 loosens the lead screw 121, the rotation of the lead screw 121 can drive the winding needle assembly 140 to rotate synchronously to achieve the winding of the battery cell.

[0045] Combined with Figure 1 and Figure 4 shown, the winding needle assembly 140 includes: a winding needle mechanism 141 and a connecting member 143. The winding needle mechanism 141 includes a plurality of winding needles. The connecting member 143 is connected to the winding needle mechanism 141 and is rotatably connected to the slider 125. Among them, the second limiting module 133 is connected to the end of the slider 125 and partially sleeved outside the connecting member 143. A spacer block is provided in the annular gap between the second limiting module 133 and the connecting member 143.

[0046] The above-mentioned winding needles can be set to two. One end of the connecting member 143 is connected to the winding needle mechanism 141, and the other end of the connecting member 143 passes through the second mounting through-hole 171 and is rotatably connected to the slider 125. A central through-hole is provided inside the slider 125. Two bearings are axially spaced from each other in the central through-hole to rotatably connect with the connecting member 143. The lead screw 121 partially passes through the second limiting module 133 and extends into the connecting member 143. The slider 125 has a T-shaped block structure. As Figure 3 shown, a spacer block 101 inserted into the central through-hole is provided at one end of the slider 125 away from the second support base 170. The second limiting module 133 is connected to the slider 125 through the spacer block 101.

[0047] The drive mechanism 110 includes: a servo motor 111, a first conductive slip ring 113, and a second conductive slip ring 115. The first conductive slip ring 113 is connected to the servo motor 111, the second conductive slip ring 115 is connected to the lead screw 121, and the second conductive slip ring 115 is electrically connected to the limit mechanism 130.

[0048] Each of the above-mentioned conductive sliders 125 consists of a rotating part and a stationary part. The rotating part can be connected to the lead screw 121 and rotate therewith, and the stationary part is connected to the slider 125 or the nut 123. By loading the conductive slip ring on the lead screw 121 and leading wires at both ends of the slip ring, signals can be transmitted in a rotating state, which will not be elaborated here.

[0049] Exemplary winding machine

[0050] The winding machine includes the winding device 100, the unwinding device, and the blanking device as described above. The unwinding device is configured to load the battery cell winding material onto the winding device 100 for winding to form a battery cell, and the blanking device is configured to remove and blank the formed battery cell from the winding device 100.

[0051] According to the above description, the present application has the following advantages:

[0052] 1. Through a set of drive mechanisms, the rotation and linear motion of the winding needle assembly can be switched, thereby simplifying the drive logic and saving installation space.

[0053] 2. The shaft-holding brake is adopted to realize the rotation or linear motion of the lead screw driving the winding assembly, with high reliability.

[0054] 3. The service life of the lead screw is prolonged.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Obviously, the above embodiments are only examples given for clear illustration, rather than limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery cell winding device, characterized in that, Comprising: A driving mechanism (110), including a rotational output part; A transmission mechanism (120), connected to the rotational output part; A needle winding assembly (140), connected to the transmission mechanism (120); A limiting mechanism (130), connected to the transmission mechanism (120), capable of enabling the transmission mechanism (120) to output a rotational motion to drive the needle winding assembly (140) to rotate, and also capable of enabling the transmission mechanism (120) to output a linear motion to drive the needle winding assembly (140) to move axially; The transmission mechanism (120) includes: A lead screw (121); A nut (123), threadedly connected to the lead screw (121), and the nut (123) is rotatable; A slider (125), connected to the lead screw (121); Wherein, the rotational output part is connected to the nut (123) to drive the nut (123) to rotate, the needle winding assembly (140) is rotatably connected to the slider (125), and the limiting mechanism (130) includes a first limiting module (131) and a second limiting module (133) that can be switched to rotate synchronously with the lead screw (121) or move axially synchronously with the lead screw (121); Both the first limiting module (131) and the second limiting module (133) include a shaft-holding brake; The first limiting module (131) is connected to the nut (123), the second limiting module (133) is connected to the slider (125) and the needle winding assembly (140), and the first limiting module (131) and the second limiting module (133) can be connected to the lead screw (121); The transmission mechanism (120) further includes: A driving gear (129), connected to the rotational output part; A driven gear (127), meshing with the driving gear (129), and the nut (123) is connected to the driven gear (127); The battery cell winding device further includes: A control system, communicatively connected to the first limiting module (131) and the second limiting module (133) to control the first limiting module (131) and the second limiting module (133) to hold the lead screw (121) tightly; The control system can control the first limiting module (131) to hold the lead screw (121) tightly while the second limiting module (133) releases the lead screw (121), so that the lead screw (121) drives the needle winding assembly (140) to rotate synchronously; The control system can also control the second limiting module (133) to hold the lead screw (121) tightly while the first limiting module (131) releases the lead screw (121), so that the lead screw (121) drives the needle winding assembly (140) to move linearly.

2. The core winding device according to claim 1, wherein The battery cell winding device further includes: A guiding mechanism (150), connected to the transmission mechanism (120) to guide the linear motion output by the transmission mechanism (120).

3. The cell winding device according to claim 2, wherein The guiding mechanism (150) includes: A first guiding rod (151), passing through the slider (125); A second guide rod (153) penetrates through the slider (125), and the second guide rod (153) is disposed opposite to the first guide rod (151).

4. The core winding device according to any one of claims 1 to 3, characterized in that, Further included are: A first support seat (160) having a first mounting through hole (161); A second support seat (170) spaced apart from and disposed opposite to the first support seat (160); Wherein, the first limiting module (131) is disposed in the first mounting through hole (161), the lead screw (121) penetrates through the first limiting module (131) and the first mounting through hole (161), and there is a gap between the lead screw (121) and the first mounting through hole (161). A connecting portion is disposed in the gap, and the connecting portion connects the first limiting module (131) and the nut (123).

5. The battery cell winding device according to any one of claims 1 to 3, characterized in that The winding needle assembly (140) includes: A winding needle mechanism (141) including a plurality of winding needles; A connecting member (143) connected to the winding needle mechanism (141), and the connecting member (143) is rotatably connected to the slider (125); Wherein, the second limiting module (133) is connected to the end of the slider (125) and partially sleeved outside the connecting member (143), and a spacer block (101) is disposed in the annular gap between the second limiting module (133) and the connecting member (143).

6. A winding machine, characterized in that, Including: The winding device (10) according to any one of claims 1 to 5; An unwinding device configured to feed a battery cell coil to the winding device (10) for winding to form a battery cell; A blanking device configured to remove and blank the formed battery cell from the winding device (10).

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