Upper winding machine structure

Abstract

The utility model discloses an upper winding machine structure, which relates to the technical field of battery production, and comprises an unwinding mechanism, and the unwinding mechanism comprises a negative plate unwinding roller, a positive plate unwinding roller and a diaphragm unwinding roller; the winding mechanism is fixedly arranged on the upper side of the unwinding mechanism, two shaping rollers are arranged between the unwinding mechanism and the winding mechanism, the two shaping rollers are made of soft rubber materials, the single-side overpressure depth of each shaping roller ranges from 0.2 mm to 0.5 mm, and a cleaning mechanism is arranged between the shaping rollers and the unwinding mechanism. The winding mechanism is arranged on the unwinding mechanism, so that dust generated by the unwinding mechanism can be effectively prevented from being wound into a battery cell, the problem of poor short circuit of pole piece winding is solved, the risk of poor short circuit in a winding core is reduced, a positive pole piece, a diaphragm and a negative pole piece can be rolled during winding through the two arranged shaping rollers, and the winding efficiency is improved. The flatness can be improved, the surface state is improved, and therefore the winding quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, specifically to a structure of a master winding machine. Background Technology

[0002] Lithium-ion battery electrodes include positive and negative electrodes. After preparation, the positive and negative electrodes are typically wound onto a winding shaft, allowing for the storage of more electrodes. To separate the positive and negative electrodes, a separator is placed between them. Therefore, during winding, the winding shaft is driven by a motor, winding the positive and negative electrodes, along with the separator between them, onto the shaft together. After the positive and negative electrodes are wound onto the winding shaft to reach the specified number of winding layers, the winding needle is removed, forming a battery cell.

[0003] For example, the utility model patent with publication number CN218548527U and title "Battery Cell Electrode Winding Device" includes a positive electrode roll, a negative electrode roll, a first diaphragm roll, a second diaphragm roll, a transmission component, an electrolyte tank, and a winding needle. The positive electrode roll and the negative electrode roll are disposed at the rear end of the electrolyte tank, and the first diaphragm roll and the second diaphragm roll are disposed at the front end of the electrolyte tank. The positive electrode sheet and the negative electrode sheet are connected by a transmission component. The positive electrode sheet and the negative electrode sheet are transmitted from the rear end of the electrolyte tank through the inside of the electrolyte tank to the front end of the electrolyte tank. The positive electrode sheet, the first diaphragm sheet, the negative electrode sheet, and the second diaphragm sheet are arranged at intervals and are wound in cooperation with the winding needle.

[0004] During battery cell production, a certain amount of debris or dust is generated in the electrode preparation and separator processing stages. This dust easily adheres to the separator or electrode. If this dust is wound into the battery cell, it can easily cause a short circuit. Many existing battery cell winding equipment have the winding needles and other winding devices set at a lower position on the equipment, while the unwinding device is set at a higher position. As in the aforementioned patent, dust falls from the unwinding device during operation. This dust, along with the dust in the production workshop, falls and accumulates at a lower position. The electrode winding mechanism at a lower position often winds up the dust and foreign objects at a lower position into the battery cell, affecting the winding quality of the battery cell. Utility Model Content

[0005] The purpose of this invention is to provide a structure for a host winding machine to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a top-level winding machine structure, including an unwinding mechanism, the unwinding mechanism including a negative electrode unwinding roller for unwinding negative electrode sheets, a positive electrode unwinding roller for unwinding positive electrode sheets, and a diaphragm unwinding roller for unwinding diaphragms; a winding mechanism, which is fixedly disposed on the upper side of the unwinding mechanism, two shaping rollers are disposed between the unwinding mechanism and the winding mechanism, both shaping rollers are made of soft rubber material, the single-sided overpressure depth of both shaping rollers is 0.2-0.5mm, and a cleaning mechanism is disposed between the shaping rollers and the unwinding mechanism.

[0007] Preferably, the winding mechanism includes two winding needles disposed on the upper side of the shaping roller, and a cutting blade is disposed between the two winding needles.

[0008] Preferably, a CCD alignment detection mechanism is provided between the winding mechanism and the two shaping rollers.

[0009] Preferably, the cleaning mechanism includes two first brushes that are rotatably disposed between the negative electrode unwinding roller and the two shaping rollers.

[0010] Preferably, two second brushes are provided between the positive electrode unwinding roller and the two shaping rollers.

[0011] Preferably, the negative electrode unwinding roller is provided with two first guide rollers on the side away from the shaping roller, and a negative electrode tension roller is provided between the two first guide rollers. The positive electrode unwinding roller is provided with two second guide rollers on the side away from the shaping roller, and a positive electrode tension roller is provided between the two second guide rollers.

[0012] In the above technical solution, this utility model provides an upper winding machine structure, which has the following beneficial effects: by setting the winding mechanism above the unwinding mechanism, it can effectively prevent the dust generated by the unwinding mechanism from being rolled into the battery cell, thereby improving the short circuit problem of electrode winding and reducing the risk of short circuit inside the core. The two shaping rollers can roll the positive electrode, diaphragm and negative electrode between windings, which can improve flatness and surface condition, thereby increasing the winding quality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1. Negative electrode unwinding roller; 2. First guide roller; 3. Negative electrode tension roller; 4. First brush; 5. Diaphragm unwinding roller; 6. Diaphragm tension roller; 7. Positive electrode unwinding roller; 8. Second guide roller; 9. Positive electrode tension roller; 10. Second brush; 11. Shaping roller; 12. CCD alignment detection mechanism; 13. Winding needle; 14. Cutting knife; 101. Negative electrode sheet; 102. Positive electrode sheet. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Please see Figure 1 A superstructure winding machine structure, the technical solution proposed in this utility model includes an unwinding mechanism, which includes a negative electrode unwinding roller 1 for unwinding negative electrode sheet 101, a positive electrode unwinding roller 7 for unwinding positive electrode sheet 102, and a diaphragm unwinding roller 5 for unwinding the diaphragm; a winding mechanism, which is fixedly arranged on the upper side of the unwinding mechanism, and two shaping rollers 11 are arranged between the unwinding mechanism and the winding mechanism. Both shaping rollers 11 are made of soft rubber, and one side of the two shaping rollers 11... The overpressure depth is 0.2-0.5mm. A cleaning mechanism is provided between the shaping roller 11 and the unwinding mechanism. The negative electrode unwinding roller 1 is used to place and unwind the negative electrode sheet 101, the positive electrode unwinding roller 7 is used to place and unwind the positive electrode sheet 102, and the diaphragm unwinding roller 5 is used to place and unwind the diaphragm. The winding mechanism is located above the negative electrode unwinding roller 1, the diaphragm unwinding roller 5, and the positive electrode unwinding roller 7, and is located above most of the components. The shaping roller 11 is located near the winding mechanism, such as... Figure 1 As shown, the diaphragm unwinding roller 5 is in the middle position, with the negative electrode unwinding roller 1 on its left and the positive electrode unwinding roller 7 on its right. The negative electrode 101, diaphragm, and positive electrode 102 pass through the middle of the two shaping rollers 11 and are connected to the winding mechanism. Before the winding mechanism winds the negative electrode 101, diaphragm, and positive electrode 102, they are pre-rolled and bonded, which can improve the flatness, surface condition, and bonding effect of the negative electrode 101, diaphragm, and positive electrode 102. By setting the single-sided overpressure depth of the shaping roller 11 to 0.2-0.5mm, the edges of the electrode can be made neater and flatter without damaging the electrode, thus facilitating the subsequent winding mechanism. At the same time, by setting the winding mechanism above the unwinding mechanism, it can effectively prevent dust on the unwinding mechanism from falling onto the battery cell being wound. Since the winding mechanism is in a higher position, it can effectively prevent dust that accumulates at lower levels in the environment from falling onto the battery cell, achieving a good dustproof effect.

[0019] Specifically, the winding mechanism includes two winding needles 13 disposed on the upper side of the shaping roller 11, with a cutting blade 14 positioned between the two winding needles 13. The two winding needles 13 wind the negative electrode sheet 101, the diaphragm, and the positive electrode sheet 102 that have been rolled by the shaping roller 11. The two winding needles 13 can rotate and interchange positions. The cutting blade 14 is positioned above the middle position of the two winding needles 13, and will not interfere with the rotation and interchange of the two winding needles 13. Figure 1 As shown, the negative electrode 101, the separator, and the positive electrode 102 are clamped and wound by the left winding needle 13. After a certain number of turns, the positions of the left and right winding needles 13 are rotated and interchanged. At this time, the unwound right winding needle 13 rotates to the left, and the negative electrode 101, the separator, and the positive electrode 102 are covered on it. The winding needle 13 clamps the negative electrode 101, the separator, and the positive electrode 102, so that the negative electrode 101, the separator, and the positive electrode 102 between the left and right winding needles 13 are moderately taut. Then, the cutting blade 14 moves down to cut the negative electrode 101, the separator, and the positive electrode 102 between the two winding needles 13. Then, the battery cell with the right side completed winding is removed, and the left side clamps the negative electrode 101, the separator, and the positive electrode 102 and rotates to complete the winding.

[0020] Specifically, a CCD alignment detection mechanism 12 is provided between the winding mechanism and the two shaping rollers 11; after the negative electrode 101, the diaphragm and the positive electrode 102 are rolled by the two shaping rollers 11, the CCD alignment detection mechanism 12 checks whether the negative electrode 101, the diaphragm and the positive electrode 102 are aligned.

[0021] Specifically, the cleaning mechanism includes two first brushes 4 rotatably disposed between the negative electrode unwinding roller 1 and the two shaping rollers 11; the two first brushes 4 are respectively disposed on both sides of the negative electrode 101. When the negative electrode 101 is unwound, the two first brushes 4 can sweep off the dust and dirt on the negative electrode 101, preventing it from being rolled and adhered to the negative electrode 101 when passing through the shaping rollers 11, thereby preventing the dust on the negative electrode 101 from being rolled into the battery cell, and also reducing the dust adhering to the shaping rollers 11.

[0022] Specifically, two second brushes 10 are provided between the positive electrode unwinding roller 7 and the two shaping rollers 11. The two second brushes 10 are respectively provided on both sides of the positive electrode 102. When the positive electrode 102 is unwound, the two second brushes 10 can sweep off the dust and dirt on the positive electrode 102, preventing it from being rolled and adhered to the positive electrode 102 when passing through the shaping rollers 11. This prevents the dust on the positive electrode 102 from being rolled into the battery cell and also reduces the dust adhering to the shaping rollers 11.

[0023] Specifically, two first guide rollers 2 are arranged on the side of the negative electrode unwinding roller 1 away from the shaping roller 11, and a negative electrode tension roller 3 is arranged between the two first guide rollers 2. Two second guide rollers 8 are arranged on the side of the positive electrode unwinding roller 7 away from the shaping roller 11, and a positive electrode tension roller 3 is arranged between the two second guide rollers 8. The two first guide rollers 2 are located below the negative electrode unwinding roller 1, and the two second guide rollers 8 are located below the positive electrode unwinding roller 7. The travel path of the negative electrode 101 can be adjusted by the first guide rollers 2, and the travel path of the positive electrode 102 can be adjusted by the second guide rollers 8. The two forming rollers 11 are arranged to facilitate the rolling of the positive electrode 102, the diaphragm, and the negative electrode 101. A diaphragm tension roller 6 is arranged below the diaphragm unwinding roller 5, a negative electrode tension roller 3 is arranged below the two first guide rollers, and a positive electrode tension roller 9 is arranged below the two second guide rollers 8. Since the positive electrode tension roller 9 and the negative electrode tension roller 3 will generate friction when they come into contact with the positive electrode 102 or the negative electrode 101, some dust will be generated. By setting the tension rollers below, the dust generated by friction can be prevented from falling on the positive electrode 102 or the negative electrode 101.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for a host winding machine, characterized in that, The unwinding mechanism includes a negative electrode unwinding roller (1) for unwinding the negative electrode sheet (101), a positive electrode unwinding roller (7) for unwinding the positive electrode sheet (102), and a diaphragm unwinding roller (5) for unwinding the diaphragm. A winding mechanism is fixedly installed on the upper side of the unwinding mechanism. Two shaping rollers (11) are provided between the unwinding mechanism and the winding mechanism. Both shaping rollers (11) are made of soft rubber material. The single-sided overpressure depth of the two shaping rollers (11) is 0.2-0.5mm. A cleaning mechanism is provided between the shaping rollers (11) and the unwinding mechanism.

2. The upper-level winding machine structure according to claim 1, characterized in that, The winding mechanism includes two winding needles (13) disposed on the upper side of the shaping roller (11), and a cutting blade (14) is disposed between the two winding needles (13).

3. The upper-level winding machine structure according to claim 2, characterized in that, A CCD alignment detection mechanism (12) is provided between the winding mechanism and the two shaping rollers (11).

4. The upper-level winding machine structure according to claim 3, characterized in that, The cleaning mechanism includes two first brushes (4) that are rotatably disposed between the negative electrode unwinding roller (1) and the two shaping rollers (11).

5. The upper-level winding machine structure according to claim 4, characterized in that, Two second brushes (10) are provided between the positive electrode unwinding roller (7) and the two shaping rollers (11).

6. The upper-level winding machine structure according to claim 5, characterized in that, Two first guide rollers (2) are provided on the side of the negative electrode unwinding roller (1) away from the shaping roller (11), and a negative electrode tension roller (3) is provided between the two first guide rollers (2). Two second guide rollers (8) are provided on the side of the positive electrode unwinding roller (7) away from the shaping roller (11), and a positive electrode tension roller (9) is provided between the two second guide rollers (8).

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