A double-station needle-extracting reel and its winding mechanism

Abstract

The present invention discloses a double-station needle-drawing reel, which comprises a reel housing, a winding needle and a winding needle shaft for pushing the winding needle to draw. The winding needle includes a first winding needle and a second winding needle, the winding needle shaft includes a first scroll shaft and a second scroll shaft, and the first scroll shaft and the second scroll shaft are respectively slidably arranged in the reel housing. The core diaphragm is wound simultaneously by two juxtaposed winding needles, and the two winding needles are respectively connected by two spline shafts, so that the two winding needles can slide independently in the reel, realizing the separate movement of the two winding needles. After winding, the two winding needles are drawn back and forth by a needle-drawing device, and the core is fixed simultaneously during the drawing process, so that the diaphragm is not taken out, ensuring the quality of the core, improving the qualified rate of the product, and at the same time increasing the specifications of the produced core products.

Description

Technical Field

[0001] The present invention relates to a core winding needle mechanism for a lithium battery, in particular to a double-station needle extraction reel and its winding mechanism. Background Art

[0002] A lithium battery forms a battery core by winding a separator with positive and negative electrode sheets together through a winding machine. Currently, the common needle unloading structure on lithium battery EV winding machines in the market adopts the method of single-sided needle extraction with double-piece needles. When extracting the core of the lithium battery in this way, due to the large friction between the needle and the ceramic separator, it is easy to extract the core of the ceramic separator and the battery with a relatively high battery core, resulting in the scrapping of semi-finished products, directly affecting the product qualification rate, reducing production efficiency, and wasting a large amount of production costs. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a double-station needle extraction reel and its winding mechanism in which a set of winding shafts contains two sets of spline shafts respectively driving two needles to perform sequential needle extraction, reducing the phenomenon of core extraction of the battery core.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A double-station needle extraction reel includes:

[0006] A reel housing;

[0007] Needles, the needles include a first needle and a second needle, at least part of the first needle is movably arranged in the reel housing, and at least part of the second needle is movably arranged in the reel housing;

[0008] Needle shafts, the needle shafts include a first shaft and a second shaft, the first needle is connected to the first shaft, the second needle is connected to the second shaft, at least part of the first shaft is movably arranged in the reel housing, at least part of the second shaft is movably arranged in the reel housing, the first shaft is used to push the first needle for needle extraction or needle insertion, and the second shaft is used to push the second needle for needle extraction or needle insertion.

[0009] As an improvement of the above technical solution, a connection component is further provided between the needle and the needle shaft, the connection component is respectively used to connect the first needle and the first needle shaft, and the second needle and the second needle shaft, and the first needle and the second needle are arranged in parallel.

[0010] As a further improvement of the above technical solution, the connection component includes an adjustment seat and a connection head, the adjustment seat is fixed on the needle shaft by shaft locking, and the connection head is used to connect the adjustment seat and the needle; and / or,

[0011] A limiting sleeve is also sleeved on the needle winding shaft. A limiting pin is provided on one side of the limiting sleeve. A limiting hole corresponding to the limiting pin is provided on the inner wall of the winding drum housing. The limiting pin is matched with the limiting hole to limit the positions where the first winding shaft and the second winding shaft push the needle winding out.

[0012] As a further improvement of the above technical solution, both the first winding shaft and the second winding shaft are spline shafts, and the spline shafts are slidably arranged in the winding drum housing through two spline nuts.

[0013] As a further improvement of the above technical solution, a limiting seat and a pushing block are also provided at the outer end of the spline shaft. The limiting seat and the pushing block are both arranged outside the winding drum housing. The limiting seat is used to limit the sliding distance of the two spline shafts. The pushing block is used to assist in pushing the spline shaft to move. The pushing block includes a movable pushing block and a fixed pushing block. The pushing block is semicircularly arranged, and the two semicircular sliding blocks correspond to each other.

[0014] A double-station needle extraction and winding mechanism includes the above-mentioned double-station needle extraction winding drum. A support frame, a winding device and a needle extraction device are also provided outside the winding drum housing. The needle extraction device is arranged on the support frame and includes a main needle extraction device and a side needle extraction device. The main needle extraction device is used to drive the overall needle extraction and needle insertion of the needle extraction winding drum and the needle winding. The side needle extraction device is used to drive the two needle windings to perform front and back needle extractions respectively.

[0015] As an improvement of the above technical solution, a support plate is also provided above the support frame. The main needle extraction device includes a fixed seat, a main driving cylinder and a connecting rod arranged around the main driving cylinder. The main driving cylinder is fixedly arranged on the fixed seat. The air rod of the main driving cylinder is arranged on the support plate. The needle winding shaft is fixedly connected to the support plate through the connecting rod; and / or,

[0016] A bearing for installing the winding drum housing, a locking nut for locking the bearing and a gear for connecting the winding device are also provided on the outer circumference of the winding drum housing. The winding device drives the winding drum housing and the needle winding arranged inside at the same time by driving the gear arranged on the outer circumference of the winding drum housing.

[0017] As a further improvement of the above technical solution, the side needle extraction device includes a horizontal driving component and a vertical driving component. The horizontal driving component includes a horizontal cylinder, a horizontal slide rail, a horizontal slider and a lead screw mechanism for driving the horizontal slider to move on the horizontal slide rail. The horizontal slide rail is fixed on the support frame through a horizontal bracket. The moving directions of the horizontal slide rail and the lead screw mechanism are the same as the needle extraction direction of the needle winding.

[0018] As a further improvement of the above technical solution, the vertical driving component is vertically arranged with the horizontal driving component. The vertical driving component includes a vertical cylinder, a vertical slide rail, a vertical slider, and a vertical mounting block for mounting the vertical slide rail. The vertical mounting block is fixed on the horizontal slider.

[0019] As a further improvement of the above technical solution, a clamping block for pushing the spline shaft is further arranged on the vertical slider. A clamping wheel is arranged at the bottom of the clamping block. There are two clamping wheels, and the distance between the two clamping wheels is the same as the thickness of the push block.

[0020] The beneficial effects of the present invention are as follows: The double-station needle-pulling reel and its winding mechanism of the present invention wind the battery cell diaphragm simultaneously through two juxtaposed winding needles. The two winding needles are respectively connected through two spline winding needle shafts, enabling the two winding needles to slide independently in the reel, realizing the independent movement of the two winding needles. After winding, the needle-pulling device is used to pull the two winding needles back and forth, and the battery cell is fixed simultaneously during the pulling process, preventing the diaphragm from being taken out, ensuring the quality of the battery cell, improving the qualified rate of the product, and increasing the specifications of the produced battery cell products. Brief Description of the Drawings

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 is the assembly schematic diagram of the needle-pulling reel and the needle-pulling device of the present invention;

[0023] Figure 2 is the assembly schematic diagram of the needle-pulling reel of the present invention;

[0024] Figure 3 is the structural schematic diagram of the needle-pulling of the present invention;

[0025] Figure 4 is the sectional schematic diagram of the needle-pulling reel of the present invention;

[0026] Figure 5 is the structural schematic diagram of the side needle-pulling device of the present invention;

[0027] Figure 6 is the assembly schematic diagram of the structure of the needle-pulling device of the present invention.

[0028] 1. Reel housing; 11. Limit seat; 12. Pusher block; 13. Spline nut; 2. Connection assembly; 21. Adjusting seat; 22. Connector; 23. Shaft locking; 3. Limit sleeve; 31. Limit pin; 32. Limit hole; 4. First needle roller; 41. First roller shaft; 5. Second needle roller; 51. Second roller shaft; 6. Main needle extraction device; 61. Connecting rod; 62. Support frame; 63. Support plate; 64. Fixed seat; 7. Lateral drive assembly; 71. Lateral cylinder; 72. Lateral slide rail; 73. Lead screw mechanism; 8. Vertical drive assembly; 81. Vertical cylinder; 82. Vertical slide rail; 83. Vertical mounting block; 84. Clamping block; 85. Clamping wheel; 9. Winding device; 91. Bearing; 92. Gear; 93. Locking nut. Detailed implementation manners

[0029] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present invention in combination with embodiments and drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention. In addition, all connection / connection relationships involved in the patent do not simply refer to direct connection of components, but refer to more optimal connection structures that can be formed by adding or reducing connection accessories according to specific implementation situations. Each technical feature in the present invention can be combined interactively without conflicting with each other.

[0030] Refer to Figure 1 , Figure 2 , a double-station needle extraction reel, including a reel housing 1 and a needle roller and a needle roller shaft arranged in the reel housing 1. The needle roller includes a first needle roller 4 and a second needle roller 5, and the first needle roller 4 and the second needle roller 5 are arranged in parallel; the needle roller shaft includes a first roller shaft 41 and a second roller shaft 51. At least part of the first needle roller 4 is movably arranged in the reel housing 1, and at least part of the second needle roller 5 is movably arranged in the reel housing 1; the first needle roller 4 is connected to the first roller shaft 41, the second needle roller 5 is connected to the second roller shaft 51, at least part of the first roller shaft 41 is movably arranged in the reel housing 1, at least part of the second roller shaft 51 is movably arranged in the reel housing 1, the first roller shaft 41 is used to push the first needle roller 4 to extract or insert the needle, and the second roller shaft 51 is used to push the second needle roller 5 to extract or insert the needle.

[0031] The first winding needle 4 is arranged at the end of the first winding shaft 41, and the second winding needle 5 is arranged at the end of the second winding shaft 51. The first winding shaft 41 and the second winding shaft 51 are respectively slidably arranged in the winding drum housing 1, and push the first winding needle 4 and the second winding needle 5 to draw and insert the needles at the end of the winding drum housing 1. The two juxtaposed winding needles are respectively connected by two winding needle shafts. The juxtaposed winding needles enable the two winding needles to rotate simultaneously to wind the lithium battery cell. The two winding needles respectively drive the movement of the winding needles through the two winding needle shafts, so that the two winding needles can be respectively twitched when drawing the needles. A support frame 62, a winding device 9 and a needle drawing device are further arranged on the outer side of the winding drum housing 1. The needle drawing device is arranged on the support frame 62 and includes a main needle drawing device 6 and a side needle drawing device. The main needle drawing device 6 is used to drive the overall needle drawing and inserting of the needle drawing drum and the winding needle, and the side needle drawing device is used to drive the two winding needles to draw the needles back and forth respectively.

[0032] Generally, a lithium battery cell is wound by rotating a winding needle to wind a long strip of ceramic diaphragm together. After winding is completed, the winding needle is withdrawn from the inside of the diaphragm. Since the winding of the cell is often relatively tight, when withdrawing the winding needle (i.e., needle drawing), the friction between the winding needle and the ceramic diaphragm will cause the part of the diaphragm in contact with the winding needle to be brought out during the process of withdrawing the winding needle, resulting in the dispersion of the wound cell, damaging the quality of the wound cell or making it directly unusable. Therefore, when winding the cell, two juxtaposed winding needles are used to wind simultaneously. After winding is completed, first use the side needle drawing device to withdraw the second winding needle 5. When the second winding needle 5 is withdrawn, the first winding needle 4 forms a fixation inside the cell, so that the second winding needle 5 is not easily brought out the diaphragm during the withdrawal process. After the second winding needle 5 is withdrawn, use the winding mechanism to rotate the position of the needle drawing drum, so that the first winding needle 4 corresponds to the side needle drawing device. At this time, the space inside the cell becomes larger, and the first winding needle 4 can be easily withdrawn without bringing out the cell diaphragm, ensuring the production quality of the lithium battery cell.

[0033] Refer to Figure 3 、 Figure 4 A connection component 2 is further arranged between the winding needle and the winding needle shaft. The connection component 2 is respectively used to connect the first winding needle 4 and the first winding shaft 41, and the second winding needle 5 and the second winding shaft 51. The connection component 2 includes an adjustment seat 21 and a connection head 22. The adjustment seat 21 is fixed on the winding needle shaft through an axial lock 23, and the connection head 22 is used to connect the adjustment seat 21 and the winding needle. When the winding needle winds the cell, it is necessary to minimize the space occupied during winding and ensure the stability of the movement of the winding needle. Therefore, it is necessary to set an auxiliary winding needle shaft that restricts the movement direction of the winding needle in the winding drum housing 1. The winding needle shaft is connected to the winding needle and drives the movement of the winding needle through its own movement. The movement range of the winding needle in the winding needle cylinder is restricted, ensuring the stability of the battery cell winding and needle drawing processes.

[0034] Both the first reel shaft 41 and the second reel shaft 51 are spline shafts, and the spline shafts are slidably arranged in the reel housing 1 through two spline nuts 13. The reel needle shaft is set as a spline shaft and horizontally slides in the reel housing 1 through the spline nut 13. The spline-set reel needle shaft restricts the independent rotation of the reel needle shaft and the reel needle, ensuring the stability of the reel needle and the reel needle shaft during rotation and extraction. A limit sleeve 3 is also sleeved on the reel needle shaft. A limit pin 31 is provided on one side of the limit sleeve 3. A limit hole 32 corresponding to the limit pin 31 is provided on the inner wall of the reel housing 1. The limit pin 31 cooperates with the limit hole 32 to limit the position where the first reel shaft 41 and the second reel shaft 51 push the reel needle out. When the reel needle extends out of the head of the reel housing 1 to a suitable length for winding, the limit pin 31 on the limit sleeve 3 provided at the end of the reel needle shaft just inserts into the limit hole 32 provided at the end of the reel housing 1, restricting the rotation of a single reel needle and the reel needle shaft while blocking the continuous movement of the reel needle, ensuring the accuracy of the reel needle extraction and insertion processes.

[0035] A limit seat 11 and a push block 12 are also provided at the outer end of the spline shaft. The limit seat 11 and the push block 12 are both arranged outside the reel housing 1. The limit seat 11 is used to limit the sliding distance of the two spline shafts, and the push block 12 is used to assist in pushing the spline shaft to move. The push block 12 includes a movable push block 12 and a fixed push block 12. The push block 12 is semicircularly arranged, and the two semicircular sliders correspond to each other. The limit block is at the position of the spline shaft close to the tail. When the reel needle shaft pushes the reel needle to a suitable position, it is necessary to ensure that the reel needle no longer moves forward. Therefore, the limit seat 11 provided at the tail end of the reel needle shaft abuts against the entrance of the reel needle shaft at the end of the reel housing 1 when the reel needle reaches a suitable position, preventing the reel needle shaft from moving forward. The movement distance of the reel needle shaft is restricted, further ensuring the accuracy of the reel needle extraction and insertion processes.

[0036] Refer to Figure 1 、 Figure 5 , a support plate 63 is further provided above the support frame 62. The main needle extraction device 6 includes a fixed seat 64, a main driving cylinder, and a connecting rod 61 arranged around the main driving cylinder. The main driving cylinder is fixedly arranged on the fixed seat 64. The air rod of the main driving cylinder is arranged on the support plate 63. The reel needle shaft is fixedly connected to the support plate 63 through the connecting rod 61. When the reel needle completes one winding and the needle extraction and needs to extend the two reel needles forward again before winding again, at this time, the main driving cylinder is started to drive the support plate 63 to move forward. At the same time, the connecting rod 61 fixedly connected to the support plate 63 drives the connecting plate fixedly connected to the connecting rod 61 and the reel needle shaft to move forward, thereby pushing the reel needle shaft to move forward and pushing the reel needle to a suitable position for winding.

[0037] The specific pin insertion process is as follows: First, start the main driving cylinder. Since the main driving cylinder is fixedly arranged between an auxiliary support base and the support plate 63, when the main driving cylinder is started, the cylinder shaft of the main driving cylinder arranged on the support plate 63 extends out, pushing the support plate 63 to move in the direction of the core winding. While the support plate 63 is moving, the fixed seat 64 connected to the support plate through the connecting rod 61 moves in the direction of the core winding as the cylinder rod extends. At this time, the reel support fixedly arranged on the fixed seat 64 drives the two reels arranged on the upper reel support to simultaneously push the two winding pins to move in the direction of the core winding until the two reels simultaneously push the two winding pins to reach the winding position of the core, and the winding of the core is carried out. Using a main pin extraction device 6 to simultaneously push the two winding pins ensures the balance and stability between the two winding pins during winding.

[0038] On the outer periphery of the reel housing 1, there are also provided a bearing 91 for installing the reel housing 1, a locking nut 93 for locking the bearing 91, and a gear 92 for connecting the winding device 9. The winding device 9 simultaneously drives the reel housing 1 and the winding pins arranged inside by driving the gear 92 arranged on the outer periphery of the reel housing 1.

[0039] Refer to Figure 6 , the side pin extraction device includes a horizontal driving component 7 and a vertical driving component 8. The horizontal driving component 7 includes a horizontal cylinder 71, a horizontal slide rail 72, a horizontal slider, and a lead screw mechanism 73 for driving the horizontal slider to move on the horizontal slide rail 72. The horizontal slide rail 72 is fixed on the support frame 62 through a horizontal support. The moving directions of the horizontal slide rail 72 and the lead screw mechanism 73 are the same as the pin extraction direction of the winding pins. The vertical driving component 8 is arranged perpendicular to the horizontal driving component 7. The vertical driving component 8 includes a vertical cylinder 81, a vertical slide rail 82, a vertical slider, and a vertical mounting block 83 for installing the vertical slide rail 82. The vertical mounting block 83 is fixed on the horizontal slider. A clamping block 84 for pushing the spline shaft is also arranged on the vertical slider. A clamping wheel 85 is arranged at the bottom of the clamping block 84. There are two clamping wheels 85, and the distance between the two clamping wheels 85 is the same as the thickness of the push block 12.

[0040] The process of the side needle extraction device pushing the needle winding shaft to extract the needle is as follows: First, start the vertical drive assembly 8. The vertical cylinder 81 drives the vertical slider to move along the vertical slide rail 82 in the direction of the needle winding shaft. The clamping block 84 moves with the vertical slider. When the clamping wheel 85 provided at the bottom of the clamping block 84 contacts the push block 12 provided on the needle winding shaft, the two clamping wheels 85 clamp the push block 12 on both sides of the push block 12. After the push block 12 is clamped by the clamping wheels 85, start the horizontal drive assembly 7. The horizontal drive motor drives the horizontal slider to move along the horizontal slide rail 72. Since the horizontal slide rail 72 is in the same direction as the needle extraction direction of the needle winding, when the horizontal slider moves, it drives the vertical drive assembly 8 provided on the horizontal slider to move. Further, the clamping block 84 pushes the push block 12 provided on the needle winding shaft to move, and the needle winding shaft moves together with the push block 12, realizing the needle extraction process of the needle winding.

[0041] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A double-station needle-pulling and winding mechanism, characterized in that: Comprising a double-station needle-pulling reel, the double-station needle-pulling reel includes: A reel housing; Needle rollers, the needle rollers include a first needle roller and a second needle roller arranged in parallel, at least part of the first needle roller is movably arranged in the reel housing, and at least part of the second needle roller is movably arranged in the reel housing; Needle roller shafts, the needle roller shafts include a first roller shaft and a second roller shaft arranged in parallel, the first needle roller is connected to the first roller shaft, the second needle roller is connected to the second roller shaft, at least part of the first roller shaft is movably arranged in the reel housing, at least part of the second roller shaft is movably arranged in the reel housing, the first roller shaft is used to push the first needle roller for needle pulling or needle inserting, the second roller shaft is used to push the second needle roller for needle pulling or needle inserting, the whole of the needle-pulling reel and the needle rollers can perform needle pulling and needle inserting, and the first needle roller and the second needle roller can perform front and back needle pulling respectively; On the outer side of the reel housing, there are also provided a support frame, a winding device and a needle-pulling device, the needle-pulling device is arranged on the support frame and includes a main needle-pulling device and a side needle-pulling device, the main needle-pulling device is used to drive the whole of the double-station needle-pulling reel and the needle rollers to perform needle pulling and needle inserting, and the side needle-pulling device is used to drive the first needle roller and the second needle roller to perform front and back needle pulling respectively.

2. The double-station needle extraction and winding mechanism according to claim 1, wherein: There is also a connection assembly between the needle rollers and the needle roller shafts, and the connection assembly is respectively used to connect the first needle roller and the first needle roller shaft, and the second needle roller and the second needle roller shaft.

3. The double-station needle extraction and winding mechanism according to claim 2, characterized in that: The connection assembly includes an adjustment seat and a connection head, the adjustment seat is fixed on the needle roller shaft by an axle lock, and the connection head is used to connect the adjustment seat and the needle roller; and / or, A limit sleeve is also sleeved on the needle roller shaft, a limit pin is provided on one side of the limit sleeve, and a limit hole corresponding to the limit pin is provided on the inner wall of the reel housing, and the limit pin cooperates with the limit hole to limit the position where the first roller shaft and the second roller shaft push the needle roller to extend.

4. The double-station needle extraction and winding mechanism according to claim 1, wherein: Both the first roller shaft and the second roller shaft are spline shafts, and the spline shafts are slidably arranged in the reel housing through two spline nuts.

5. The double-station needle extraction and winding mechanism according to claim 4, characterized in that: A limit seat and a push block are also provided at the outer end of the spline shaft, both the limit seat and the push block are arranged outside the reel housing, the limit seat is used to limit the sliding distance of the two spline shafts, the push block is used to assist in pushing the spline shaft to move, the push block includes a movable push block and a fixed push block, the push block is semicircularly arranged, and the two semicircular push blocks correspond to each other.

6. The double-station needle-pulling winding mechanism according to claim 1, characterized in that: A support plate is also provided above the support frame, the main needle-pulling device includes a fixed seat, a main driving cylinder and a connecting rod arranged around the main driving cylinder, the main driving cylinder is fixedly arranged on the fixed seat, the air rod of the main driving cylinder is arranged on the support plate, and the needle roller shaft is fixedly connected to the support plate through the connecting rod; and / or, On the outer circumference of the reel housing, there are also provided a bearing for installing the reel housing, a locking nut for locking the bearing, and a gear for connecting the winding device, and the winding device drives the reel housing and the needle rollers arranged inside simultaneously by driving the gear arranged on the outer circumference of the reel housing.

7. The double-station needle extraction and winding mechanism according to claim 1, characterized in that: The side needle extraction device includes a lateral driving assembly and a vertical driving assembly. The lateral driving assembly includes a lateral cylinder, a lateral slide rail, a lateral slider, and a lead screw mechanism for driving the lateral slider to move on the lateral slide rail. The lateral slide rail is fixed to the support frame through a lateral bracket, and the movement directions of the lateral slide rail and the lead screw mechanism are consistent with the needle extraction direction of the coiling needle.

8. The double-station needle-pulling winding mechanism according to claim 7, characterized in that: The vertical driving assembly is arranged perpendicular to the lateral driving assembly. The vertical driving assembly includes a vertical cylinder, a vertical slide rail, a vertical slider, and a vertical mounting block for mounting the vertical slide rail. The vertical mounting block is fixed to the lateral slider.

9. The double-station needle extraction and winding mechanism according to claim 8, characterized in that: A clamping block for pushing the spline shaft is further arranged on the vertical slider. A clamping wheel is arranged at the bottom of the clamping block. There are two clamping wheels, and the distance between the two clamping wheels is consistent with the thickness of the push block.

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