A center pin assembly for a cylindrical battery rolling station and a rolling device

Abstract

The utility model belongs to the technical field of electric core rubbing device, concretely relates to a cylindrical battery rubbing station center needle subassembly and rubbing device, center needle subassembly includes center needle base and rubbing center needle, the center position on center needle base is provided with bearing, the lower extreme of rubbing center needle is connected with center needle base rotatory through bearing, rubbing device includes the cylindrical battery rubbing station center needle subassembly, still includes rubbing base, center needle subassembly sets up in the center position on rubbing base, is provided with a plurality of rubbing wheel fixed base on rubbing base, is rotatory and is provided with rubbing wheel on every rubbing wheel fixed base, the utility model can make the rubbing center needle relative electric core keep static in the operation process, effectively prevent the pole lug contact center needle when driving pole lug rotation, avoid center hole collapse and pole piece drop powder, can effectively promote product optimization rate and performance.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery cell flattening device, specifically relating to a cylindrical battery flattening station center needle assembly and flattening device. Background Technology

[0002] Cylindrical batteries are lithium-ion batteries encapsulated in a cylindrical metal casing. They are characterized by their compact structure, high energy density, and good heat dissipation. Internally, they consist of core components such as a positive electrode, negative electrode, separator, and electrolyte, and are formed into cells through winding or stacking processes. The winding process of a cylindrical battery cell includes electrode preparation, winding, and tab welding. Electrode preparation involves coating the positive and negative electrodes with active materials, then rolling and slitting them to form electrodes of specified dimensions. The winding process involves stacking the positive and negative electrodes and the separator in sequence, then winding them into a cylindrical cell using a winding machine. During winding, it is crucial to ensure electrode alignment and uniform tension to avoid wrinkles or breakage. Tab welding involves welding tabs to the positive and negative electrodes to draw current. The position and welding quality of the tabs directly affect the battery's internal resistance and consistency. The post-winding flattening operation is a critical step in cylindrical battery cell manufacturing. Its purpose is to smooth the wound tabs, facilitating subsequent current collector welding and battery assembly.

[0003] In existing technology, after winding, bare battery cells are conveyed to the leveling station via a stepper line. After pre-positioning by leveling rollers at both ends, the cells are clamped by a pressing cylinder. Both leveling heads feed and level simultaneously. When a dynamic device is used, the leveling center needle rotates along with the leveling head during the leveling process. During the leveling feed, the tabs are subjected to a force towards the center hole. The inner tabs at the battery head may collapse towards the center hole and contact the center needle. Since the center needle rotates, it causes the tabs to rotate, ultimately leading to the collapse of the battery's center hole. This collapse of the cell's center hole results in electrode powder shedding, causing low battery voltage and affecting product performance and yield. Therefore, it is necessary to provide a novel cylindrical battery leveling station center needle assembly and leveling device. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a cylindrical battery flattening station center needle assembly and flattening device, which can keep the flattening center needle static relative to the battery cell during the operation, effectively prevent the electrode tab from rotating when it contacts the center needle, avoid the collapse of the center hole and the shedding of powder from the electrode sheet, and effectively improve the product yield and performance.

[0005] The purpose of this utility model is achieved as follows: a cylindrical battery flattening station center needle assembly includes a center needle base and a flattening center needle. A bearing is provided at the center position of the center needle base, and the lower end of the flattening center needle is rotatably connected to the center needle base through the bearing.

[0006] Furthermore, the main body of the flattening center needle is a cylindrical structure with a conical tip at its upper end.

[0007] Furthermore, the sidewall of the kneading center needle is provided with multiple grooves, which are evenly distributed around the central axis of the kneading center needle.

[0008] A cylindrical battery flattening station flattening device includes a cylindrical battery flattening station center needle assembly and a flattening base. The center needle assembly is disposed at the center position of the flattening base. The flattening base is provided with a plurality of flattening wheel fixing seats, and a flattening wheel is rotatably disposed on each flattening wheel fixing seat.

[0009] Furthermore, each of the flattening roller mounting bases is equipped with a drive motor, the output shaft of which is connected to the corresponding flattening roller. The drive motor is used to drive the corresponding flattening roller to rotate, so as to flatten the end of the battery cell through the flattening roller.

[0010] Furthermore, the center needle assembly is fixedly connected to the center position of the kneading base via the center needle base at its bottom. The center needle base can be connected to the kneading base by bolts or welding.

[0011] Furthermore, the plurality of the kneading roller fixing seats are evenly distributed around the kneading center needle in the center needle assembly.

[0012] Furthermore, the number of the kneading wheel fixing seats is consistent with the number of the grooves provided on the side wall of the kneading center needle, and the positions of the corresponding kneading wheels on them correspond one-to-one with the grooves, with the end of the kneading wheel extending into the corresponding groove.

[0013] Furthermore, the smoothing wheel is composed of a cylindrical extrusion part and a conical smoothing part. The diameter of the extrusion part is larger than the diameter of the bottom surface of the smoothing part. The bottom surface of the extrusion part connected to the smoothing part is the extrusion surface. The conical surface of the smoothing wheel is the smoothing surface. The smoothing wheel presses against the end of the battery cell through the smoothing surface on the conical smoothing part. The extrusion part fits and limits the side of the battery cell through its extrusion surface.

[0014] Furthermore, the kneading base is equipped with a dust removal port, which can collect powder and other substances generated during the operation, ensuring the quality and safety of the operation.

[0015] The beneficial effects of this utility model are as follows: A cylindrical battery flattening station center needle assembly of this utility model includes a center needle base and a flattening center needle. A bearing is provided at the center position of the center needle base, and the lower end of the flattening center needle is rotatably connected to the center needle base through the bearing. A cylindrical battery flattening station flattening device of this utility model includes the aforementioned cylindrical battery flattening station center needle assembly, and also includes a flattening base. The center needle assembly is disposed at the center position of the flattening base. Multiple flattening wheel fixing seats are provided on the flattening base, and a flattening wheel is rotatably mounted on each flattening wheel fixing seat. This invention changes the dynamic operation of the flattening center needle, which rotates with the flattening base during operation, to a static device relative to the battery cell. The flattening center needle is separated from the center needle base, and a bearing is placed at the center of the center needle base. The flattening center needle and the center needle base are rotatably connected through this added bearing. The center needle base is installed at the corresponding position on the flattening base. During the rotation of the flattening base, the flattening center needle remains stationary after being inserted into the battery cell, thus making the center needle a static device. This effectively prevents the tab from rotating when it contacts the center needle, avoiding collapse of the center hole and powder shedding from the electrode sheet, and effectively improving product yield and performance. Attached Figure Description

[0016] Figure 1 The diagram shown is an exploded view of the center needle assembly of the cylindrical battery flattening station of this utility model.

[0017] Figure 2 The image shown is a top view of the center needle assembly of the cylindrical battery flattening station of this utility model.

[0018] Figure 3 The diagram shown is an exploded view of the cylindrical battery flattening station flattening device of this utility model.

[0019] Figure 4 The image shown is a top view of the cylindrical battery flattening station flattening device of this utility model. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that all directional indications (such as up-down-left-right-forward-backward...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0023] like Figure 1-4 As shown, a cylindrical battery flattening station center needle assembly includes a center needle base 3 and a flattening center needle 1. A bearing 2 is provided at the center position of the center needle base 3, and the lower end of the flattening center needle 1 is rotatably connected to the center needle base 3 through the bearing 2.

[0024] Furthermore, the main body of the flattening center needle 1 is a cylindrical structure with a conical tip at its upper end. During the flattening operation, the conical tip at its upper end facilitates the insertion of the flattening center needle 1 into the center hole of the battery cell.

[0025] Furthermore, the sidewall of the kneading center needle 1 is provided with a plurality of grooves, which are evenly distributed around the central axis of the kneading center needle 1.

[0026] When the above-mentioned center pin assembly is used to flatten the bare battery cell after winding at the flattening station, the upper part of the flattening center pin 1 is inserted into the center hole of the battery cell, and the lower end is rotatably connected to the center pin base 3 through the bearing 2. When the flattening device base rotates, the flattening center pin 1 will not rotate with the rotation of the flattening device base due to the friction between it and the battery cell. This achieves the flattening center pin remaining static relative to the battery cell, effectively preventing the electrode tab from rotating when it contacts the center pin, avoiding the collapse of the center hole and the shedding of electrode powder, and effectively improving the product yield and performance.

[0027] A cylindrical battery flattening station flattening device includes a cylindrical battery flattening station center needle assembly and a flattening base 4. The center needle assembly is located at the center of the flattening base 4. The flattening base 4 is provided with a plurality of flattening wheel fixing seats 5, and a flattening wheel 6 is rotatably mounted on each flattening wheel fixing seat 5.

[0028] When the above-mentioned leveling device is used to level the bare battery cells after winding at the leveling station, the upper part of the leveling center needle 1 is inserted into the center hole of the battery cell, and the lower end is rotatably connected to the center needle base 3 through the bearing 2. The leveling wheel 6 of the leveling device presses against the end of the battery cell. When the leveling base 4 rotates, the leveling center needle 1 will not rotate with the rotation of the leveling device base due to the friction between it and the battery cell. This achieves the leveling center needle remaining static relative to the battery cell, effectively preventing the tab from rotating when it contacts the center needle, avoiding the collapse of the center hole and the shedding of powder from the electrode sheet, and effectively improving the product yield and performance.

[0029] Furthermore, each of the kneading roller fixing bases 5 is provided with a drive motor, the output shaft of the drive motor is connected to the corresponding kneading roller 6, and the drive motor is used to drive the corresponding kneading roller 6 to rotate so as to knead the end of the battery cell through the kneading roller 6.

[0030] Furthermore, the center needle assembly is fixedly connected to the center position of the kneading base 4 via the center needle base 3 at its bottom. The center needle base 3 can be connected to the kneading base 4 by bolt connection or welding.

[0031] Furthermore, the plurality of the kneading roller fixing seats 5 are evenly distributed around the kneading center needle 1 in the center needle assembly.

[0032] Furthermore, the number of the kneading wheel fixing seats 5 is consistent with the number of the grooves provided on the side wall of the kneading center needle 1, and the positions of the corresponding kneading wheels 6 on them correspond one-to-one with the grooves, with the end of the kneading wheel 6 extending into the corresponding groove.

[0033] Furthermore, the flattening roller 6 is composed of a cylindrical extrusion part 61 and a conical flattening part 62. The diameter of the extrusion part 61 is larger than the diameter of the bottom surface of the flattening part 62. The bottom surface of the extrusion part 61 connected to the flattening part 62 is the extrusion surface, and the conical surface of the flattening roller 62 is the flattening surface. The flattening roller 6 presses against the end of the battery cell through the flattening surface on the conical flattening part 62, and the extrusion part 61 fits and limits the side of the battery cell through its extrusion surface.

[0034] Furthermore, the kneading base 4 is provided with a dust removal port 7, which can collect powder and other substances generated during the operation to ensure the quality and safety of the operation.

[0035] In summary, this utility model discloses a cylindrical battery flattening station center needle assembly, comprising a center needle base 3 and a flattening center needle 1. A bearing 2 is disposed at the center position of the center needle base 3, and the lower end of the flattening center needle 1 is rotatably connected to the center needle base 3 via the bearing 2. This utility model also discloses a cylindrical battery flattening station flattening device, comprising the aforementioned cylindrical battery flattening station center needle assembly, and further comprising a flattening base 4. The center needle assembly is disposed at the center position of the flattening base 4, and the flattening base 4 is provided with multiple flattening wheel fixing seats 5, each of which has a flattening wheel 6 rotatably mounted. This invention changes the dynamic operation of the flattening center needle, which rotates with the flattening base during operation, to a static device relative to the battery cell. The flattening center needle is separated from the center needle base, and a bearing is placed at the center of the center needle base. The flattening center needle and the center needle base are rotatably connected through this added bearing. The center needle base is installed at the corresponding position on the flattening base. During the rotation of the flattening base, the flattening center needle remains stationary after being inserted into the battery cell, thus making the center needle a static device. This effectively prevents the tab from rotating when it contacts the center needle, avoiding collapse of the center hole and powder shedding from the electrode sheet, and effectively improving product yield and performance.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A center pin assembly for a cylindrical battery flattening station, characterized in that, It includes a center needle base (3) and a kneading center needle (1). A bearing (2) is provided at the center position of the center needle base (3). The lower end of the kneading center needle (1) is rotatably connected to the center needle base (3) through the bearing (2).

2. The cylindrical battery flattening station center pin assembly according to claim 1, characterized in that, The main body of the flattening center needle (1) is a cylindrical structure with a conical tip at the top.

3. The cylindrical battery flattening station center needle assembly according to claim 2, characterized in that, The side wall of the flattening center needle (1) is provided with multiple grooves, and the multiple grooves are evenly distributed around the central axis of the flattening center needle (1) along the circumference.

4. A cylindrical battery flattening station flattening device, comprising the cylindrical battery flattening station center needle assembly as described in claim 3, characterized in that, It also includes a kneading base (4), the center needle assembly is located at the center of the kneading base (4), and the kneading base (4) is provided with a plurality of kneading wheel fixing seats (5), and each kneading wheel fixing seat (5) is rotatably provided with a kneading wheel (6).

5. A cylindrical battery flattening station flattening device according to claim 4, characterized in that, Each of the kneading roller mounting bases (5) is equipped with a drive motor, and the output shaft of the drive motor is connected to the corresponding kneading roller (6).

6. The cylindrical battery flattening station flattening device according to claim 4, characterized in that, The central needle assembly is fixedly connected to the middle position of the kneading base (4) via the central needle base (3) at its bottom.

7. A cylindrical battery flattening station flattening device according to claim 4, characterized in that, Multiple kneading wheel fixing seats (5) are evenly distributed around the kneading center needle (1) in the center needle assembly.

8. A cylindrical battery flattening station flattening device according to claim 7, characterized in that, The number of the kneading wheel fixing seats (5) is consistent with the number of the grooves provided on the side wall of the kneading center needle (1), and the position of the corresponding kneading wheel (6) on it corresponds one-to-one with the groove, and the end of the kneading wheel (6) extends into the groove corresponding to it.

9. A cylindrical battery flattening station flattening device according to claim 8, characterized in that, The kneading wheel (6) is composed of a cylindrical extrusion part (61) and a conical kneading part (62), wherein the diameter of the extrusion part (61) is larger than the diameter of the bottom surface of the kneading part (62).

10. A cylindrical battery flattening station flattening device according to claim 4, characterized in that, The kneading base (4) is provided with a dust removal port (7).

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