Winding correction device

Abstract

The utility model relates to the technical field of batteries, in particular to a winding correcting device which comprises a pole piece cutting mechanism, a pole piece embossing roller mechanism and a winding tower mechanism, the pole piece embossing roller mechanism is arranged on one side of the pole piece cutting mechanism, and the winding tower mechanism is arranged on the other side of the pole piece cutting mechanism. A pole piece dust removal mechanism is arranged on one side, far away from the pole piece cutting mechanism, of the pole piece embossing roller mechanism, and the winding tower mechanism is arranged on the other side of the pole piece dust removal mechanism; according to the utility model, the pole piece is directly wound behind the embossing roller, so that the process influence is avoided, and the influence on the stress of salient points of the embossed pole piece caused by the friction force of the roller is avoided; no tension change is converted into the influence of roller friction force on the stress of embossed pole piece salient points; the non-entering-roll one-way driving roller clamps the pole piece, and the roller pressure influences the stress of the embossed pole piece salient points.

Description

Technical Field

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

[0002] Currently, the capacity of power or energy storage lithium batteries is getting larger and larger. During the production process of battery cells, the alignment of the battery cell tabs directly affects the quality of the battery cells and is also a key point in quality control.

[0003] In the prior art, due to the influence of factors such as the pole piece, diaphragm, and tension, the misalignment of the battery cell tabs is too large, affecting the final winding quality rate. The existing winding machine design has the problem of unstable adjustment of the tab misalignment. The linear relationship between the adjustment pressure of the embossing roller and the misalignment value of the tab is poor, which has an unstable effect on the actual production of battery cell tab misalignment adjustment. It is impossible to detect the actual misalignment value of the tab. The embossing roller is closed-loop adjusted. The main defect or deficiency leading to the above reasons is that the embossing roller is not designed in the right position. If the embossing roller pressure is too high, the pole piece will fall off, which will eventually cause poor HI and POT tests of the core.

[0004] Therefore, how to solve the problem of electrode powder falling off during the winding process is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0005] The utility model provides a winding correction device to solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a winding correction device, including: a pole piece cutting mechanism, a pole piece embossing roller mechanism and a winding tower mechanism, wherein a pole piece embossing roller mechanism is arranged on one side of the pole piece cutting mechanism, a pole piece dust removal mechanism is arranged on the side of the pole piece embossing roller mechanism away from the pole piece cutting mechanism, and the winding tower mechanism is arranged on the other side of the pole piece dust removal mechanism.

[0007] Furthermore, the winding correction device also includes a pole piece unwinding mechanism, and a tension control mechanism is arranged on one side of the pole piece unwinding mechanism.

[0008] Furthermore, a pole piece roller 1 and a pole piece roller 2 are sequentially arranged on a side of the tension control mechanism away from the pole piece unwinding mechanism.

[0009] Furthermore, a serpentine deviation correction mechanism is provided on the other side of the pole piece passing roller 2.

[0010] Furthermore, a pole piece passing roller three is arranged between the serpentine deviation correcting mechanism and the pole piece cutting mechanism.

[0011] Furthermore, the pole piece embossing roller mechanism comprises a rubber roller and an embossing roller body, and the pole piece is suitable for passing through a gap between the embossing roller body and the rubber roller.

[0012] Furthermore, the pole piece dust removal mechanism includes two dust collectors, and the two dust collectors are respectively placed on both sides of the pole piece.

[0013] Furthermore, one of the dust collectors is provided with a left dust removal port, and the other dust collector is provided with a right dust removal port.

[0014] Furthermore, the surfaces of the right dust removal port and the left dust removal port opposite to the pole piece are both dust removal port pole piece opposite surfaces, and a plurality of dust suction holes are arranged on the dust removal port pole piece opposite surfaces.

[0015] Furthermore, the winding tower mechanism includes a variable winding needle mechanism, and the variable winding needle mechanism is arranged on a side of the pole piece dust removal mechanism away from the pole piece embossing roller mechanism.

[0016] Compared with the prior art, the utility model allows the pole piece to enter the winding directly after the embossing roller to avoid process influence, and there is no influence of the friction force of the roller on the force of the pole piece convex points after embossing; there is no tension change converted to roller friction on the force of the pole piece convex points after embossing; there is no winding unidirectional drive roller to clamp the pole piece, and the roller pressure affects the force of the pole piece convex points after embossing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 Schematic diagram of the process flow of the pole piece correction in the utility model;

[0019] Figure 2 The structure diagram of the optimal embodiment of the pole piece embossing roller mechanism of the utility model is shown;

[0020] Figure 3 The figure is a schematic diagram of the structure of the optimal embodiment of the pole piece dust removal mechanism of the utility model.

[0021] Among them, 201, pole piece unwinding mechanism; 206, tension control mechanism; 220, pole piece roller one; 231, pole piece roller two; 232, serpentine correction mechanism; 233, pole piece roller three; 234, pole piece cutting mechanism; 235, pole piece embossing roller mechanism; 236, rubber roller; 237, embossing roller body; 240, pole piece dust removal mechanism; 241, left dust removal port; 242, right dust removal port; 243, pole piece opposite side of dust removal port; 250, winding tower mechanism; 251, variable winding needle mechanism. DETAILED DESCRIPTION

[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] See also Figures 1 to 3 , Figure 1 It is a schematic diagram of the pole piece correction process in the prior art; Figure 2 The structure diagram of the optimal embodiment of the pole piece embossing roller mechanism of the utility model is shown; Figure 3 The structure diagram of the optimal embodiment of the pole piece dust removal mechanism of the utility model is shown in FIG. Figures 1 to 3 As shown, at least one embodiment provides a winding correction device, including: a pole piece unwinding mechanism 201, a pole piece cutting mechanism 234, a pole piece embossing roller mechanism 235 and a winding tower mechanism 250, and a tension control mechanism 206 is arranged on one side of the pole piece unwinding mechanism 201. A pole piece passing roller 1 220 and a pole piece passing roller 2 231 are arranged in sequence on the side of the tension control mechanism 206 away from the pole piece unwinding mechanism 201. A serpentine correction mechanism 232 is arranged on the other side of the pole piece passing roller 231. A pole piece passing roller 3 233 is arranged between the serpentine correction mechanism 232 and the pole piece cutting mechanism 234, and a pole piece embossing roller mechanism 235 is arranged on one side of the pole piece cutting mechanism 234, and the pole piece embossing roller mechanism 235 includes a rubber roller 236 and an embossing roller body 237, and the pole piece is suitable for passing through the gap between the embossing roller body 237 and the rubber roller 236. The winding tower mechanism 250 includes a variable winding needle mechanism 251 , and the variable winding needle mechanism 251 is arranged on a side of the pole piece dust removal mechanism 240 away from the pole piece embossing roller mechanism 235 .

[0024] Please continue reading Figure 3 .like Figure 3 As shown, a pole piece dust removal mechanism 240 is arranged on one side of the pole piece embossing roller mechanism 235 away from the pole piece cutting mechanism 234, and a winding tower mechanism 250 is arranged on the other side of the pole piece dust removal mechanism 240. The pole piece dust removal mechanism 240 includes two dust collectors, and the two dust collectors are respectively placed on both sides of the pole piece. A left dust removal port 241 is arranged on one dust collector, and a right dust removal port 242 is arranged on the other dust collector. The surfaces of the right dust removal port 242 and the left dust removal port 241 opposite to the pole piece are both dust removal port pole piece opposite surfaces 243, and a plurality of dust suction holes are arranged on the dust removal port pole piece opposite surfaces 243.

[0025] It needs to be further explained that the position of the embossing roller is redesigned and arranged. The key point lies in the layout position of the pole piece embossing roller mechanism 235. In conjunction with the detection of the pole ear misalignment data, the circumference adjustment of the variable winding needle mechanism 251 and the closed-loop control of the embossing roller body 237 are used to realize the correction of the pole ear misalignment. The embossing roller body 237 is optimized in design and the product quality rate is improved.

[0026] In the cell winding process, the embossing roller is helpful to improve the alignment of the final formed cell's lugs. The pits and protrusions on the pole piece after embossing increase the thickness of the pole piece and reduce the relative displacement of the lug during winding, so the lug will not deviate in one direction, making the alignment better. The variable diameter winding needle can adjust the diameter of the winding needle in a small range, thereby eliminating the deviation of the tail position of the cell and the number of cell layers caused by the change in the diameter of the winding needle due to processing errors. The embossing roller produces pits and protrusions on the pole piece, and the variable diameter winding needle adjusts the deviation of the cell position during winding, increasing the interlayer spacing of the bare cell while also increasing the surface area, improving the quality of the cell.

[0027] In addition, some embodiments are applicable to winding machines and laser cutting and winding machines. The key point is that the layout position of the pole piece embossing roller mechanism 235 is equally applicable to both types of machines. The specific process applicable to the winding machine and the laser cutting and winding machine is described in detail below.

[0028] Winding machine solution: During winding, the pole piece is embossed by the pole piece embossing roller mechanism 235, so that pits and protrusions appear on the surface of the pole piece. At this time, the thickness of the pole piece changes. The pole piece passes through the pole piece dust removal mechanism 240 to remove dust from the surface of the pole piece. The tiny dust on the surface of the pole piece is removed under the action of vacuum adsorption. The pole piece is wound in the variable winding needle mechanism 251. During the winding process of the battery cell, the detection mechanism effectively detects the misalignment of multiple pole ears. The PLC program automatically feedbacks and adjusts the circumference of the needle of the pole piece embossing roller mechanism 235 or the variable winding needle mechanism 251 through the set parameters to realize the closed-loop control of adjustment-detection-adjustment.

[0029] Laser cutting and winding machine solution: During winding, the pole piece is embossed by the pole piece embossing roller mechanism 235, so that pits and protrusions appear on the surface of the pole piece. At this time, the thickness of the pole piece changes, and the pole piece passes through the pole piece dust removal mechanism 240 to remove dust from the surface of the pole piece. Under the action of vacuum adsorption, the pole piece is wound in 235 or the variable winding needle mechanism 251. During the winding process of the battery cell, the detection mechanism effectively detects the misalignment of multiple pole ears, and the PLC program automatically feedbacks and adjusts the pole piece embossing roller mechanism 235 or the needle circumference of 235 or the variable winding needle mechanism 251 through the set parameters, or adjusts the pole ear spacing by adjusting the laser process parameters, so as to realize the closed-loop control of adjustment-detection-adjustment.

[0030] In summary, in the utility model, the electrode sheet directly enters the winding process after passing through the embossing roller, and the electrode sheet roller pattern will not be deformed by the surface force of the roller during the conveying or deviation correction process, resulting in unstable electrode sheet thickness of the roller pattern, which ultimately leads to unstable misalignment of the electrode ears of the finished battery cell; the electrode sheet directly enters the winding process after passing through the embossing roller without any process influence, and the embossing pressure is controlled to achieve precise control of the electrode sheet embossing thickness to ensure stable electrode sheet thickness, and finally the misalignment of the electrode ears of the finished battery cell is controllable, and when detecting the misalignment of the electrode ears, a closed loop of adjustment is achieved through changes in the pressure of the rear embossing roller and precise adjustment of the circumference of the winding; a dust collector is designed under the embossing roller to absorb dust on the surface of the electrode sheet to solve the problem of poor voltage caused by the rolling pressure of the embossing roller.

[0031] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A winding correction device, characterized in that: include: A pole piece cutting mechanism (234), a pole piece embossing roller mechanism (235) and a winding tower mechanism (250), wherein the pole piece cutting mechanism (234) is provided with a pole piece embossing roller mechanism (235) on one side, the pole piece embossing roller mechanism (235) is provided with a pole piece dust removal mechanism (240) on the side away from the pole piece cutting mechanism (234), and the winding tower mechanism (250) is provided on the other side of the pole piece dust removal mechanism (240).

2. The winding correction device according to claim 1, characterized in that: The winding correction device further comprises a pole piece unwinding mechanism (201), and a tension control mechanism (206) is arranged on one side of the pole piece unwinding mechanism (201).

3. The winding correction device according to claim 2, characterized in that: A pole piece roller 1 (220) and a pole piece roller 2 (231) are sequentially arranged on a side of the tension control mechanism (206) away from the pole piece unwinding mechanism (201).

4. The winding correction device according to claim 3, characterized in that: A serpentine deviation correction mechanism (232) is provided on the other side of the pole piece passing roller 2 (231).

5. The winding correction device according to claim 4, characterized in that: A pole piece passing roller three (233) is arranged between the serpentine deviation correcting mechanism (232) and the pole piece cutting mechanism (234).

6. The winding correction device according to claim 5, characterized in that: The pole piece embossing roller mechanism (235) comprises a rubber roller (236) and an embossing roller body (237), and the pole piece is suitable for passing through the gap between the embossing roller body (237) and the rubber roller (236).

7. The winding correction device according to claim 6, characterized in that: The pole piece dust removal mechanism (240) comprises two dust collectors, and the two dust collectors are respectively placed on both sides of the pole piece.

8. The winding correction device according to claim 7, characterized in that: One of the dust collectors is provided with a left dust removal port (241), and the other dust collector is provided with a right dust removal port (242).

9. The winding correction device according to claim 8, characterized in that: The surfaces of the right dust removal port (242) and the left dust removal port (241) opposite to the pole piece are both dust removal port pole piece opposite surfaces (243), and a plurality of dust suction holes are arranged on the dust removal port pole piece opposite surfaces (243).

10. The winding correction device according to claim 9, characterized in that: The winding tower mechanism (250) comprises a variable winding needle mechanism (251), and the variable winding needle mechanism (251) is arranged on a side of the pole piece dust removal mechanism (240) away from the pole piece embossing roller mechanism (235).

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