Forming negative pressure suction device suitable for cylindrical battery

Abstract

The utility model discloses a kind of formation negative pressure suction devices suitable for cylindrical battery, including positioning sleeve, suction pipe and suction nozzle, the port of positioning sleeve first end is equipped with mounting plate;The suction pipe is along the axial direction of the positioning sleeve and is set in the mounting plate, the suction nozzle is arranged in the positioning sleeve and includes connected connecting section and conical section, the connecting section is connected with the suction pipe, the conical section is used to seal with the liquid injection hole.The formation negative pressure suction device suitable for cylindrical battery of the utility model can effectively prevent electrolyte from overflowing during suction process, thereby reducing the residue of electrolyte on the cell cover plate, reducing the risk of electrolyte pollution. Since the pollution of electrolyte is reduced, the subsequent sealing nail welding yield is improved, thereby reducing the defective rate in production process, improve production efficiency. In addition, electrolyte pollution is reduced, the demand of manual wiping or machine wiping is reduced, thereby reducing production cost.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and specifically to a negative pressure suction device for the formation of cylindrical batteries. Background Technology

[0002] In the lithium battery production process, the formation process is a critical step affecting battery performance and reliability. During formation, gases generated by the internal chemical reactions of the battery need to be extracted using a negative pressure suction device to ensure the normal chemical reactions within the battery.

[0003] In related technologies, during the formation process, electrolyte residue can easily remain within the sealing ring of the suction nozzle on the cell cover, causing electrolyte contamination on the battery surface. This contamination not only affects the battery's appearance quality but also negatively impacts the yield of subsequent sealing pin welding. Using manual or machine wiping increases production costs. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose a negative pressure suction device for the formation of cylindrical batteries.

[0006] The negative pressure suction device for the formation of cylindrical batteries according to this utility model embodiment includes a positioning sleeve, a suction tube, and a suction nozzle. A mounting plate is provided at the first end of the positioning sleeve. The suction tube passes through the mounting plate along the axial direction of the positioning sleeve. The first end of the suction tube is located inside the positioning sleeve, and the second end of the suction tube is located outside the positioning sleeve and is used to connect to a negative pressure device. The suction nozzle is located inside the positioning sleeve and includes a connecting section and a tapered section. The connecting section is connected to the suction tube. The cross-sectional area of ​​the tapered section gradually decreases along the axial direction of the positioning sleeve in the direction away from the mounting plate. The tapered section is used to extend into the electrolyte injection hole of the cylindrical battery and seal the electrolyte injection hole.

[0007] In some embodiments, the mounting plate is provided with a mounting through hole extending along the axis of the positioning sleeve, and the formation negative pressure suction device for cylindrical batteries includes a mounting sleeve, the mounting sleeve passing through the mounting through hole, and the suction tube passing through the mounting sleeve.

[0008] In some embodiments, the outer peripheral surface of the mounting sleeve is provided with a flange, the flange is provided on the side of the mounting plate opposite to the suction nozzle, the flange is provided with a first connecting hole, the mounting plate is provided with a second connecting hole, and the flange and the mounting plate are connected by fasteners passing through the first connecting hole and the second connecting hole.

[0009] In some embodiments, the suction tube is movable relative to the mounting sleeve along the axial direction of the positioning sleeve. The suction tube is provided with a first limiting member and a second limiting member spaced apart on both sides of the mounting plate along the axial direction of the positioning sleeve. The first limiting member is located outside the positioning sleeve to restrict the suction tube from moving into the positioning sleeve, and the second limiting member is located inside the positioning sleeve to allow the suction tube to move out of the positioning sleeve.

[0010] In some embodiments, a return spring is sleeved on the suction tube between the mounting sleeve and the second limiting member, and the two ends of the return spring abut against the mounting sleeve and the second limiting member, respectively.

[0011] In some embodiments, the first limiting member is a nut, and the outer circumferential surface of the suction tube is provided with a first external thread, and the nut is connected to the first external thread.

[0012] In some embodiments, the connecting section has an internal thread, and the suction tube has a second external thread, wherein the internal thread is connected to the second external thread.

[0013] In some embodiments, the connecting segment has an annular protrusion on one end face of the positioning sleeve facing away from the mounting plate in the axial direction. The annular protrusion surrounds the tapered segment, and the annular protrusion and the tapered segment are arranged at intervals in the radial direction of the positioning sleeve. The height of the annular protrusion is less than or equal to the height of the tapered segment.

[0014] In some embodiments, the positioning sleeve includes a large-hole section and a small-hole section, the inner diameter of the large-hole section is larger than the inner diameter of the small-hole section, the large-hole section is farther away from the mounting plate relative to the small-hole section, and the large-hole section is used to fit onto the cylindrical battery and position and cooperate with the outer peripheral surface of the cylindrical battery.

[0015] In some embodiments, a chamfer is provided at the intersection of the inner wall of the large hole section and the end face of the second end of the positioning sleeve.

[0016] This invention relates to a negative pressure suction device for the formation of cylindrical batteries. The conical section of the suction nozzle forms a seal with the electrolyte filling hole of the cylindrical battery, ensuring that no electrolyte overflows onto the cell cover during suction. Therefore, the conical nozzle design of this negative pressure suction device for cylindrical batteries allows for a tight seal between the nozzle and the battery's electrolyte filling hole, effectively preventing electrolyte overflow during suction and reducing electrolyte residue on the cell cover, thus lowering the risk of electrolyte contamination. Reduced electrolyte contamination improves the yield of subsequent sealing nail welding, thereby reducing the defect rate and increasing production efficiency. Furthermore, reduced electrolyte contamination decreases the need for manual or machine cleaning, thus lowering production costs. In addition, a clean battery surface improves the battery's appearance quality and reduces potential malfunctions caused by contamination, thereby improving the overall performance and reliability of the battery. Attached Figure Description

[0017] Figure 1 This is an installation diagram of a negative pressure suction device for the formation of cylindrical batteries according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Sectional view of AA.

[0019] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0020] 100. Formation negative pressure suction device for cylindrical batteries; 200. Cylindrical battery; 300. Injection hole; 1. Positioning sleeve; 101. Large hole section; 102. Small hole section; 103. Chamfer; 2. Mounting plate; 3. Suction tube; 4. Suction nozzle; 401. Connecting section; 402. Conical section; 403. Annular protrusion; 5. Mounting sleeve; 6. Flange; 7. Fastener; 8. First limiting component; 9. Second limiting component; 10. Return spring. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1 to 3As shown, the negative pressure suction device 100 for the formation of cylindrical batteries according to this embodiment of the present invention includes a positioning sleeve 1, a suction tube 3, and a suction nozzle 4. A mounting plate 2 is provided at the first end of the positioning sleeve 1. The suction tube 3 passes through the mounting plate 2 along the axial direction of the positioning sleeve 1. The first end of the suction tube 3 is located inside the positioning sleeve 1, and the second end of the suction tube 3 is located outside the positioning sleeve 1 and is used to connect to the negative pressure device. The suction nozzle 4 is located inside the positioning sleeve 1 and includes a connecting section 401 and a tapered section 402 connected together. The connecting section 401 is connected to the suction tube 3. The cross-sectional area of ​​the tapered section 402 gradually decreases along the axial direction of the positioning sleeve 1 in the direction away from the mounting plate 2. The tapered section 402 is used to extend into the liquid injection hole 300 of the cylindrical battery 200 and seal the liquid injection hole 300.

[0023] In use, the negative pressure suction device 100 for the formation of cylindrical batteries according to this embodiment of the invention first inserts the second end of the positioning sleeve 1 onto the cylindrical battery 200, thereby positioning the entire suction device axially. Then, the positioning sleeve 1 is moved axially along the cylindrical battery 200 to insert the tapered section 402 of the suction nozzle 4 into the liquid injection hole 300 of the cylindrical battery 200, and the outer tapered surface of the tapered section 402 abuts against the inner wall of the liquid injection hole 300 of the cylindrical battery 200, thus forming a seal between the tapered section 402 of the suction nozzle 4 and the liquid injection hole 300 of the cylindrical battery 200. Afterwards, the suction tube 3 is connected to the negative pressure device to extract gas from inside the cylindrical battery 200.

[0024] Because the tapered section 402 of the suction nozzle 4 can form a seal with the electrolyte filling hole 300 of the cylindrical battery 200, it can be ensured that no electrolyte overflows onto the cell cover plate of the cylindrical battery 200 during the suction process. Therefore, the formation negative pressure suction device 100 for cylindrical batteries of this utility model embodiment, through the design of the tapered section 402 of the suction nozzle 4, enables the suction nozzle 4 to tightly seal with the battery electrolyte filling hole 300, effectively preventing electrolyte overflow during the suction process, thereby reducing electrolyte residue on the cell cover plate and reducing the risk of electrolyte contamination. Due to the reduction in electrolyte contamination, the yield of subsequent sealing nail welding is improved, thereby reducing the defect rate in the production process and improving production efficiency. In addition, the reduction in electrolyte contamination reduces the need for manual or machine wiping, thereby reducing production costs. Furthermore, a clean battery surface helps improve the appearance quality of the battery, while reducing potential failures caused by contamination, thereby improving the overall performance and reliability of the battery.

[0025] In some embodiments, the mounting plate 2 is provided with a mounting through hole extending along the axis of the positioning sleeve 1. The negative pressure suction device 100 for the formation of cylindrical batteries includes a mounting sleeve 5, which passes through the mounting through hole, and the suction tube 3 passes through the mounting sleeve 5.

[0026] like Figure 2 As shown, the axis of the mounting through hole on the mounting plate 2 is aligned with the axis of the positioning sleeve 1, ensuring the straightness and centering of the suction device so that the mounting sleeve 5 can pass through and be correctly aligned. The mounting sleeve 5 passes through the mounting through hole, providing a stable support and guide for the suction tube 3, so as to fix the position of the suction tube 3 and ensure that it will not shift during operation, so that the suction tube 3 can be more stably connected to the suction nozzle 4, while reducing displacement caused by vibrations that may occur during suction.

[0027] The design of the mounting sleeve 5 makes the entire suction device more stable during operation, reducing errors caused by device movement or vibration. The design of the mounting through hole and mounting sleeve 5 makes the installation process of the suction tube 3 simpler and faster, improving production efficiency. The stable device reduces the risk of accidents during operation and improves production safety. Due to the improved stability and alignment of the device, the suction tube 3 can be inserted more accurately into the battery's filling hole 300, thereby improving suction efficiency.

[0028] In some embodiments, a flange 6 is provided on the outer peripheral surface of the mounting sleeve 5. The flange 6 is provided on the side of the mounting plate 2 away from the suction nozzle 4. The flange 6 is provided with a first connecting hole, and the mounting plate 2 is provided with a second connecting hole. The flange 6 and the mounting plate 2 are connected by fasteners 7 passing through the first connecting hole and the second connecting hole.

[0029] For example, such as Figure 3 As shown, fastener 7 is a bolt. When maintenance or replacement of the mounting sleeve 5 is required, the mounting sleeve 5 can be installed by removing and installing the bolts, making the operation more convenient. By providing a flange 6 on the outer circumference of the mounting sleeve 5 to connect with the mounting plate 2, the support area between the mounting sleeve 5 and the mounting plate 2 is increased, thereby improving the installation stability of the mounting sleeve 5. This reduces the displacement of the suction tube 3 due to vibration or improper operation and improves the sealing reliability between the suction nozzle 4 and the liquid injection hole 300 on the cylindrical battery 200.

[0030] In some embodiments, the suction tube 3 is movable relative to the mounting sleeve 5 along the axial direction of the positioning sleeve 1. The suction tube 3 is provided with a first limiting member 8 and a second limiting member 9 spaced apart on both sides of the mounting plate 2 along the axial direction of the positioning sleeve 1. The first limiting member 8 is located outside the positioning sleeve 1 to restrict the suction tube 3 from moving into the positioning sleeve 1, and the second limiting member 9 is located inside the positioning sleeve 1 to allow the suction tube 3 to move out of the positioning sleeve 1.

[0031] Specifically, such as Figure 2In use, the suction tube 3 can move relative to the mounting sleeve 5 along the axial direction of the positioning sleeve 1. This design allows the suction tube 3 to be adjusted within a certain range to accommodate cylindrical batteries 200 of different sizes. The first limiting member 8 is located outside the positioning sleeve 1 and its function is to restrict the suction tube 3 from moving into the positioning sleeve 1. This prevents the suction tube 3 from being over-inserted during operation, thereby protecting the battery and the suction tube 3 itself. The second limiting member 9 is located inside the positioning sleeve 1 and is used to restrict the suction tube 3 from moving out of the positioning sleeve 1. This ensures that the suction tube 3 does not completely retract from the positioning sleeve 1 during operation and remains in the correct position.

[0032] By limiting the range of motion of the suction tube 3, potential accidents during operation are reduced, improving operational safety. The limiting component design prevents excessive movement of the suction tube 3, thereby avoiding potential damage to the battery or suction device. The movable suction tube 3 design allows the device to accommodate cylindrical batteries 200 of different sizes, improving the device's flexibility and applicability. The limiting component ensures that the suction tube 3 operates within its intended positional range, which helps maintain the long-term stability and reliability of the device.

[0033] In some embodiments, a return spring 10 is sleeved on the suction tube 3 between the mounting sleeve 5 and the second limiting member 9, and the two ends of the return spring 10 abut against the mounting sleeve 5 and the second limiting member 9, respectively.

[0034] Specifically, such as Figure 2 As shown, when the positioning sleeve 1 is fitted onto the cylindrical battery 200, the tapered section 402 of the suction nozzle 4 abuts against the injection hole 300. The suction tube 3 moves outward from the positioning sleeve 1, compressing the return spring 10. Simultaneously, the return spring 10 applies an elastic force to the suction nozzle 4 towards the injection hole 300, ensuring the suction nozzle 4 is securely abutted against the injection hole 300 and effectively guaranteeing the seal between the suction nozzle 4 and the injection hole 300. After suctioning the cylindrical battery 200 is complete, the positioning sleeve 1 separates from the cylindrical battery 200, and the suction tube returns to its original position under the action of the return spring 10, facilitating the next suction operation.

[0035] The reset spring 10 allows the suction tube 3 to automatically reset after operation without manual intervention, improving production efficiency. The automatic reset function of the reset spring 10 reduces errors in the suction tube 3's position caused by improper manual operation, improving operational accuracy. The reset spring 10 ensures that the suction tube 3 returns to the correct position after each operation, contributing to the long-term stability and reliability of the device. The reset spring 10 also allows the suction tube 3 to move within a certain range to accommodate batteries of different sizes, increasing the device's applicability and flexibility.

[0036] In some embodiments, the first limiting member 8 is a nut, and the outer peripheral surface of the suction tube 3 is provided with a first external thread, and the nut is connected to the first external thread.

[0037] like Figure 2 As shown, the first limiting member 8 is in the form of a nut, which is connected to the suction tube 3 by a thread, and can restrict the suction tube 3 from moving into the positioning sleeve 1. The nut is connected to the first external thread on the suction tube 3. By rotating the nut, the distance between the nut and the suction tube 3 can be adjusted, thereby precisely controlling the position of the suction tube 3.

[0038] The design of the nut and external thread allows the operator to fine-tune the position of the suction tube 3 by rotating the nut, improving positioning accuracy. The tight connection between the nut and the external thread provides additional stability, ensuring that the suction tube 3 will not move accidentally during operation. Because the nut can be easily rotated, operation is simpler when adjusting the position of the suction tube 3 or performing maintenance. The design of the nut and external thread allows the device to quickly adapt to cylindrical batteries 200 of different sizes, increasing the device's applicability.

[0039] In some embodiments, the connecting section 401 has an internal thread, and the suction tube 3 is provided with a second external thread, with the internal thread connected to the second external thread.

[0040] like Figure 2 and Figure 3 As shown, the connection between the internal thread and the second external thread provides a tight fit, ensuring a seal between the nozzle 4 and the suction tube 3 and reducing the risk of electrolyte leakage. The threaded connection design simplifies and speeds up the assembly and disassembly of the nozzle 4 and suction tube 3, facilitating maintenance and component replacement. Because the threaded connection can provide different connection lengths, the device can accommodate battery filling holes 300 of varying depths. The tight threaded connection improves the stability of the entire suction device, reducing displacement caused by vibration or improper operation. The simple and quick connection process helps improve production line efficiency and reduce downtime.

[0041] In some embodiments, the connecting segment 401 has an annular protrusion 403 on one end face of the positioning sleeve 1 away from the mounting plate 2 in the axial direction. The annular protrusion 403 surrounds the tapered segment 402. The annular protrusion 403 and the tapered segment 402 are arranged at intervals in the radial direction of the positioning sleeve 1. The height of the annular protrusion 403 is less than or equal to the height of the tapered segment 402.

[0042] like Figure 2 and Figure 3As shown, the annular protrusion 403 can be sealed with the cell cover to achieve a double seal between the nozzle 4 and the electrolyte filling hole 300, which helps improve the sealing performance between the nozzle 4 and the battery electrolyte filling hole 300 and reduces the risk of electrolyte leakage. Simultaneously, the spaced arrangement of the annular protrusion 403 and the conical section 402 increases the structural stability of the nozzle 4 and reduces device displacement caused by vibration or improper operation. The spaced annular protrusion 403 helps to disperse pressure, reducing concentrated pressure on a single point, thereby improving the overall durability of the nozzle 4.

[0043] In some embodiments, the positioning sleeve 1 includes a large hole section 101 and a small hole section 102. The inner diameter of the large hole section 101 is larger than the inner diameter of the small hole section 102. The large hole section 101 is farther away from the mounting plate 2 relative to the small hole section 102. The large hole section 101 is used to be sleeved on the cylindrical battery 200 and to position and cooperate with the outer peripheral surface of the cylindrical battery 200.

[0044] like Figure 3 As shown, the large-hole section 101 allows the suction device to fit tightly against the outer circumferential surface of the cylindrical battery 200, improving positioning accuracy and reducing operational errors caused by inaccurate positioning. Due to the tight fit between the large-hole section 101 and the outer circumferential surface of the battery, the entire device is more stable during operation, reducing device displacement caused by vibration or improper operation. The design of the positioning sleeve 1 simplifies the operation process, enabling operators to quickly and accurately position the battery, improving production efficiency. The improved positioning accuracy and stability help reduce the risk of electrolyte contamination, improving the quality and reliability of battery products.

[0045] In some embodiments, a chamfer 103 is provided at the position where the inner wall of the large hole section 101 intersects with the end face of the second end of the positioning sleeve 1.

[0046] The chamfer 103 reduces stress concentration, thereby enhancing the structural reliability of the positioning sleeve 1 and extending the service life of the device. Furthermore, the chamfer 103 acts as a guide when the positioning sleeve 1 is fitted onto the cylindrical battery 200, thus improving the installation efficiency of the positioning sleeve 1 on the cylindrical battery 200.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A formation negative pressure suction device for a cylindrical battery, characterized by, include: Positioning sleeve (1), wherein the first end of the positioning sleeve (1) is provided with a mounting plate (2); A suction tube (3) is inserted through the mounting plate (2) along the axial direction of the positioning sleeve (1). The first end of the suction tube (3) is located inside the positioning sleeve (1), and the second end of the suction tube (3) is located outside the positioning sleeve (1) and is used to connect to the negative pressure device. The suction nozzle (4) is disposed inside the positioning sleeve (1) and includes a connecting section (401) and a tapered section (402). The connecting section (401) is connected to the suction tube (3). The cross-sectional area of ​​the tapered section (402) gradually decreases along the axial direction of the positioning sleeve (1) away from the mounting plate (2). The tapered section (402) is used to extend into the liquid injection hole (300) of the cylindrical battery (200) and seal the liquid injection hole (300).

2. The formation negative pressure suction device for cylindrical battery according to claim 1, wherein The mounting plate (2) is provided with a mounting through hole extending along the axis of the positioning sleeve (1). The negative pressure suction device for the formation of cylindrical batteries includes a mounting sleeve (5), which is inserted through the mounting through hole, and the suction tube (3) is inserted through the mounting sleeve (5).

3. The formation negative pressure suction device suitable for cylindrical batteries according to claim 2, characterized by, The mounting sleeve (5) has a flange (6) on its outer circumferential surface. The flange (6) is located on the side of the mounting plate (2) away from the suction nozzle (4). The flange (6) has a first connecting hole, and the mounting plate (2) has a second connecting hole. The flange (6) and the mounting plate (2) are connected by fasteners (7) that pass through the first connecting hole and the second connecting hole.

4. The formation negative pressure suction device suitable for cylindrical batteries according to claim 2, wherein The suction tube (3) is movable relative to the mounting sleeve (5) along the axial direction of the positioning sleeve (1). The suction tube (3) is provided with a first limiting member (8) and a second limiting member (9) spaced apart on both sides of the mounting plate (2) along the axial direction of the positioning sleeve (1). The first limiting member (8) is located outside the positioning sleeve (1) to restrict the suction tube (3) from moving into the positioning sleeve (1). The second limiting member (9) is located inside the positioning sleeve (1) to allow the suction tube (3) to move out of the positioning sleeve (1).

5. The formation negative pressure suction device suitable for cylindrical batteries according to claim 4, wherein A return spring (10) is sleeved on the suction tube (3) between the mounting sleeve (5) and the second limiting member (9), and the two ends of the return spring (10) abut against the mounting sleeve (5) and the second limiting member (9) respectively.

6. The formation negative pressure suction device suitable for cylindrical battery according to claim 4, wherein The first limiting member (8) is a nut, and the outer circumferential surface of the suction tube (3) is provided with a first external thread, and the nut is connected to the first external thread.

7. The formation negative pressure suction device suitable for cylindrical battery according to claim 1, wherein The connecting section (401) has an internal thread, and the suction tube (3) is provided with a second external thread, the internal thread being connected to the second external thread.

8. The negative pressure suction device for the formation of cylindrical batteries according to claim 7, characterized in that, The connecting section (401) has an annular protrusion (403) on one end face of the positioning sleeve (1) away from the mounting plate (2) in the axial direction. The annular protrusion (403) surrounds the tapered section (402). The annular protrusion (403) and the tapered section (402) are arranged at intervals in the radial direction of the positioning sleeve (1). The height of the annular protrusion (403) is less than or equal to the height of the tapered section (402).

9. The negative pressure suction device for the formation of cylindrical batteries according to claim 1, characterized in that, The positioning sleeve (1) includes a large hole section (101) and a small hole section (102). The inner diameter of the large hole section (101) is larger than the inner diameter of the small hole section (102). The large hole section (101) is located away from the mounting plate (2) relative to the small hole section (102). The large hole section (101) is used to be fitted onto the cylindrical battery (200) and to position and cooperate with the outer circumferential surface of the cylindrical battery (200).

10. The negative pressure suction device for the formation of cylindrical batteries according to claim 9, characterized in that, The inner wall of the large hole section (101) is chamfered (103) at the intersection of the end face of the second end of the positioning sleeve (1).

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