Adjustable circular winding needle

Abstract

The utility model provides an adjustable circular winding needle, and belongs to the field of new energy batteries. The winding needle comprises a winding needle shell, a top plate and a sealing cover, the winding needle shell is of a cylindrical structure, a plurality of mounting holes are evenly formed in the winding needle shell in the circumferential direction at intervals, the top plate slidably penetrates through the mounting holes and is arranged in the radial direction of the winding needle shell, a first blade is arranged at the end, located in the winding needle shell, of the top plate, and a second blade is arranged at the other end of the top plate; the first blade and the second blade are both of an arc-shaped sheet structure, the first blade encloses to form a cavity, the cavity is of a circular structure, one end of the winding needle shell is open, the other end of the winding needle shell is closed, the sealing cover is arranged at the opening of the winding needle shell, and an air valve communicated with the cavity is arranged on the sealing cover. By adopting the adjustable circular winding needle provided by the embodiment of the utility model, the problem of lower compatibility in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to an adjustable circular coiling needle. Background Technology

[0002] Currently, there are two main structural designs for lithium-ion batteries: stacking and winding. Compared to stacking, winding offers higher efficiency and higher quality in manufacturing. Within existing winding manufacturing processes, there are various forms, differing primarily in the shape of the winding machine's needles. Currently, winding needles are mainly divided into circular and elliptical needles. Circular needles offer higher production efficiency and greater equipment control precision compared to other shapes, and circular winding is gradually becoming the mainstream process.

[0003] The circular coiling needles in the existing technology are usually coiling needles with a fixed circumference, which makes it difficult to adjust the circumference size during the production process. In the production process of different models of battery cells, it is necessary to redesign new coiling needles with different circumferences, resulting in high economic costs in the production process.

[0004] The circular coil needles in the prior art have low compatibility due to their fixed circumference. Utility Model Content

[0005] This utility model embodiment provides an adjustable circular coiling needle, which can solve the problem of low compatibility in the prior art. The technical solution is as follows:

[0006] An adjustable circular coil needle includes: a coil needle housing, a top plate, and a sealing cap.

[0007] The needle coil housing is a cylindrical structure with multiple mounting holes evenly spaced around its circumference. The top plate is slidably inserted into the mounting holes and is arranged radially along the needle coil housing. A first blade is provided at one end of the top plate inside the needle coil housing, and a second blade is provided at the other end. Both the first and second blades are arc-shaped sheet structures. The first blade encloses and forms a cavity, which is circular. One end of the needle coil housing is open, and the other end is closed. A sealing cap is provided at the opening of the needle coil housing, and an air valve connected to the cavity is provided on the sealing cap.

[0008] Optionally, the top plate includes a first top plate and a second top plate, one end of the second top plate is connected to the second blade, and the other end is provided with a mounting protrusion, one end of the first top plate is connected to the first blade, and the other end is provided with a mounting groove that matches the mounting protrusion.

[0009] Optionally, the needle coil housing includes a first housing and a second housing that are joined together. Both the first housing and the second housing include an arc-shaped housing and a housing base plate. The arc-shaped housing and the housing base plate form a semi-cylindrical structure. A clamping plate is provided between the first housing and the second housing. A clamping needle is provided on the side of the clamping plate. The clamping needle is located at the central axis of the needle coil housing.

[0010] Optionally, the clamping plate has clamping grooves on both sides of the clamping needle.

[0011] Optionally, the cavity is provided with an arc-shaped boss protruding from the bottom plate of the outer shell towards the arc-shaped outer shell. The length direction of the arc-shaped boss is consistent with the length direction of the needle coiling shell, and the arc-shaped boss matches the first blade.

[0012] Optionally, the arc-shaped boss has a first air hole connected to the air valve at one end near the sealing cover, and a second air hole is provided on the arc surface of the arc-shaped boss, with the first air hole and the second air hole connected to each other.

[0013] Optionally, multiple second air holes are provided and are evenly spaced along the length of the arc-shaped boss.

[0014] Optionally, an air bladder is provided between the arc-shaped boss and the first blade, and the air bladder is connected to the air valve.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0016] This utility model provides an adjustable circular winding needle. The winding needle shell and sealing cap form a sealed space. Gas is injected into the cavity through an air valve, increasing the air pressure inside the cavity. Under the pressure, the first blade moves towards the winding needle shell, causing the top plate to slide within the mounting hole. This causes the second blade to move away from the winding needle shell, thus increasing the circumference of the circle formed by the second blade. When the air pressure inside the cavity is reduced, the circumference of the circle formed by the second blade decreases. By adjusting the air pressure inside the cavity, the circumference of the circle formed by the second blade can be adjusted. When using this circular winding needle for winding processes, it is possible to wind electrodes and separators to form cells of different sizes, thus adapting to production processes with different cell sizes and effectively solving the problem of low compatibility in existing technologies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure after removing the sealing cap, provided in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the first outer shell structure provided in an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the first blade, top plate, and second blade assembly provided in an embodiment of the present invention;

[0022] Figure 5 This is a cross-sectional schematic diagram of another embodiment provided by this utility model.

[0023] In the diagram: 1-Needle housing; 11-Mounting hole; 12-First housing; 13-Second housing; 14-Arc-shaped housing; 15-Housing base plate; 16-Clamping plate; 17-Needle clamp; 18-Clamping groove; 2-Top plate; 21-First top plate; 211-Mounting groove; 22-Second top plate; 221-Mounting protrusion; 3-Sealing cap; 31-Air valve; 41-First blade; 42-Second blade; 5-Cavity; 6-Arc-shaped boss; 61-First air hole; 62-Second air hole; 7-Airbag. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the overall structure after removing the sealing cap, provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the first outer shell structure provided in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the first blade, top plate, and second blade assembly provided in an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of another embodiment provided by this utility model. (See diagram below.) Figures 1 to 5An adjustable circular hairpin is shown, comprising: a hairpin housing 1, a top plate 2, and a sealing cap 3. The hairpin housing 1 is a cylindrical structure, and a plurality of mounting holes 11 are evenly spaced around its circumference. The top plate 2 is slidably inserted into the mounting holes 11 and is arranged radially along the hairpin housing 1. One end of the top plate 2 located inside the hairpin housing 1 is provided with a first blade 41, and the other end is provided with a second blade 42. Both the first blade 41 and the second blade 42 are arc-shaped sheet structures. The first blade 41 encloses to form a cavity 5, which is a circular structure. One end of the hairpin housing 1 is open, and the other end is closed. The sealing cap 3 is provided at the opening of the hairpin housing 1, and an air valve 31 connected to the cavity 5 is provided on the sealing cap 3.

[0026] For example, in this embodiment of the present invention, the mounting hole 11 is a strip-shaped hole, and multiple first blades 41 are enclosed to form a circumferential structure, and multiple second blades 42 are also enclosed to form a circumferential structure. In the cell winding process, the electrode sheet and the separator are both wound around the outer circumference of the second blade 42. After the sealing cap 3 is placed on the needle housing 1, multiple first blades 41 are connected by a connecting film, so that the cavity 5 formed by the first blades 41 becomes a sealed space. Gas is injected into the cavity 5 through the air valve 31 to increase the air pressure inside the cavity 5. Under the pressure, the first blades 41 move towards the needle housing 1. Since the first blades 41, the top plate 2 and the second blades 42 are fixedly connected together, and the top plate is slidably set on the mounting hole 11, the second blades 42 located outside the needle housing 1 move away from the needle housing 1, thereby increasing the circumference of the circle formed by all the second blades 42. When the inflation of the cavity 5 is stopped, the pressure inside the cavity 5 is released through the air valve 31, causing the first blades 41 to return to their initial position, thereby decreasing the circumference of the circle formed by the second blades 42. Compared to the existing technology that uses non-adjustable winding needles, where one type of winding needle can only manufacture battery cores of one size, this utility model embodiment can change the circumference of the second blade 42 by controlling the air pressure inside the cavity 5, thereby manufacturing cores of different sizes and improving the compatibility of this circular winding needle.

[0027] This utility model provides an adjustable circular winding needle. The winding needle housing 1 and the sealing cover 3 form a sealed space. Gas is injected into the cavity 5 through the air valve 31, increasing the air pressure inside the cavity 5. Under the pressure, the first blade 41 moves towards the winding needle housing 1, causing the top plate 2 to slide within the mounting hole 11. This causes the second blade 42 to move away from the winding needle housing 1, thereby increasing the circumference of the circle formed by the second blade 42. When the air pressure inside the cavity 5 is reduced, the circumference of the circle formed by the second blade 42 decreases. By adjusting the air pressure inside the cavity 5, the circumference of the circle formed by the second blade 42 can be adjusted. When using this circular winding needle for winding processes, it is possible to wind electrodes and diaphragms to form cells of different sizes, thus adapting to the production processes of different cell sizes and effectively solving the problem of low compatibility in the prior art.

[0028] Optionally, the top plate 2 includes a first top plate 21 and a second top plate 22. One end of the second top plate 22 is connected to the second blade 42, and the other end is provided with a mounting protrusion 221. One end of the first top plate 21 is connected to the first blade 41, and the other end is provided with a mounting groove 211 that matches the mounting protrusion 221.

[0029] Exemplary, in embodiments of this utility model, such as Figure 4 As shown, the first top plate 21 and the first blade 41 can be manufactured as a single piece, and the second top plate 22 and the second blade 42 can be manufactured as a single piece to reduce installation steps. The mounting protrusion 221 is provided with an I-shaped slot, and the mounting groove 211 is provided with a corresponding I-shaped groove. By inserting the I-shaped slot and the I-shaped groove, the first top plate 21 and the second top plate 22 can be fixed together. Since the mounting hole 11 is only large enough to pass through the top plate 2, and in order to ensure the sealing of the inside of the needle housing 1, a corresponding sealing ring is provided at the mounting hole 11. This makes it impossible to install the first blade 41, the top plate 2 and the second blade 42 simultaneously from the inside or outside of the needle housing 1. The top plate 2 is set in the form of the first top plate 21 and the second top plate 22. The first top plate 21 and the second top plate 22 can be installed through the mounting protrusion 221 and the mounting groove 211. This allows the assembly of the first blade 41 and the first top plate 21 to be placed from the inside of the needle housing 1, and the assembly of the second blade 42 and the second top plate 22 to be placed from the outside of the needle housing 1. This completes the installation of the top plate 2 and improves the ease of installation of this circular needle.

[0030] Optionally, the needle coil housing 1 includes a first housing 12 and a second housing 13 that are arranged in opposition. Both the first housing 12 and the second housing 13 include an arc-shaped housing 14 and a housing base plate 15. The arc-shaped housing 14 and the housing base plate 15 form a semi-cylindrical structure. A clamping plate 16 is provided between the first housing 12 and the second housing 13. A clamping needle 17 is provided on the side of the clamping plate 16. The clamping needle 17 is located at the central axis of the needle coil housing 1.

[0031] Exemplary, in embodiments of this utility model, such as Figure 2 As shown, the outer shell 1 of the coil needle is configured as a first outer shell 12 and a second outer shell 13, which makes the operation more convenient when installing the circular coil needle. After the first outer shell 12 and the second outer shell 13 are installed with the first blade 41, the top plate 2 and the second blade 42 respectively, the first outer shell 12 and the second outer shell 13 are then assembled and installed. The clamping plate 16 is clamped between the first outer shell 12 and the second outer shell 13 for installation. A clamping needle 17 is provided on one side of the clamping plate 16. The clamping needle 17 can be selected according to the fixing device of the winding machine, and can be round or square. When performing the cell winding process, the clamping needle 17 is inserted into the shaft of the winding machine for clamping and fixing before winding begins, thus providing the operational convenience of the circular coil needle.

[0032] Optionally, the clamping plate 16 has clamping grooves 18 on both sides of the clamping pin 17.

[0033] Exemplary, in embodiments of this utility model, such as Figure 1 and Figure 2 As shown, there can be two clamping plates 16, and the clamping needle 17 can also be formed by two semi-cylindrical structures joined together. The two semi-cylindrical structures are respectively set on the two clamping plates 16, clamping the diaphragm between the two clamping plates 16, making the operation in the winding process more convenient. Since the clamping grooves 18 are opened on both sides of the clamping plate 16, it is easier to install the diaphragm and the manufacturing material of the clamping plate 16 can be reduced, thereby reducing the production cost of this circular winding needle.

[0034] Optionally, an arc-shaped boss 6 is provided in the cavity 5, protruding from the bottom plate 15 of the outer shell to the arc-shaped outer shell 14. The length direction of the arc-shaped boss 6 is consistent with the length direction of the needle coil outer shell 1, and the arc-shaped boss 6 matches the first blade 41.

[0035] For example, in this embodiment of the present invention, the arc-shaped boss 6 is located in the middle of the bottom plate 15 of the outer shell. The arc-shaped edge of the arc-shaped boss 6 matches the arc formed by the multiple first blades 41. The arc-shaped boss 6 can provide bottom support for the first blades 41. In the initial state, the first blades 41 can be placed on the arc-shaped boss, making the first blades 41 more stable in the initial state, thereby improving the structural stability of the circular coil needle.

[0036] Optionally, the arc-shaped boss 6 is provided with a first air hole 61 connected to the air valve 31 at one end near the sealing cover 3, and a second air hole 62 is provided on the arc surface of the arc-shaped boss 6, with the first air hole 61 and the second air hole 62 connected to each other.

[0037] Exemplary, in embodiments of this utility model, such as Figure 2As shown, by setting the first air hole 61 and the second air hole 62, external gas can be introduced into the cavity 5 through the air valve 31 via the first air hole 61 and the second air hole 62. When air pressure is applied to the cavity 5, the air pressure is more stable, preventing the air pressure from acting directly on the first air hole 61 and causing individual first blades 41 to move too far, thereby ensuring the stability of the second blades 42 forming a circumferential structure, and thus ensuring the structural stability of the wound battery cell.

[0038] Optionally, multiple second vents 62 are provided and are evenly spaced along the length of the arc-shaped boss 6.

[0039] For example, in this embodiment of the present invention, by providing a plurality of second air holes 62, the plurality of second air holes 62 are evenly spaced along the length direction of the arc-shaped protrusion 6 to form a row, or multiple rows of second air holes 62 can be provided, and the multiple rows of second air holes 62 are evenly spaced along the circumference of the arc-shaped protrusion 6, so that the gas filled into the cavity 5 is more evenly dispersed in the cavity 5, thereby applying a more even thrust to each first blade 41, thereby improving the stability of the circular coiled needle.

[0040] Optionally, an airbag 7 is provided between the arc-shaped boss 6 and the first blade 41, and the airbag 7 is connected to the air valve 31.

[0041] Exemplary, in embodiments of this utility model, such as Figure 5 As shown, by setting up the airbag 7, it can provide bottom support for the first blade 41. On the other hand, by inflating the airbag 7, it can expand evenly, thus providing the same amount of thrust to each first blade 41. This makes the circumference of the second blade 42 closer to a circle, thereby improving the yield of this circular coiled needle. During the winding process, the distance between the tabs can be measured and fed back to the PLC via CCD. The PLC calculates the appropriate coiled needle circumference and adjusts the pressure of the airbag 7 accordingly to achieve the purpose of adjusting the coiled needle circumference during the winding process. When it is necessary to reduce the coiled needle circumference, it is only necessary to release the internal pressure of the airbag 7. This structure is easy to operate, further improving the ease of operation of this circular coiled needle.

[0042] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable circular coiling needle, characterized in that, include: The coil housing (1), top plate (2), and sealing cap (3) The needle housing (1) is a cylindrical structure. Multiple mounting holes (11) are evenly spaced around the circumference of the needle housing (1). The top plate (2) is slidably inserted into the mounting holes (11). The top plate (2) is arranged radially along the needle housing (1). One end of the top plate (2) inside the needle housing (1) is provided with a first blade (41), and the other end is provided with a second blade (42). The first blade (41) and the second blade (42) are both arc-shaped sheet structures. The first blade (41) encloses to form a cavity (5). The cavity (5) is a circular structure. One end of the needle housing (1) is open, and the other end is closed. The sealing cover (3) is provided at the opening of the needle housing (1). The sealing cover (3) is provided with an air valve (31) that communicates with the cavity (5).

2. The adjustable circular coiling needle according to claim 1, characterized in that, The top plate (2) includes a first top plate (21) and a second top plate (22). One end of the second top plate (22) is connected to the second blade (42), and the other end is provided with a mounting protrusion (221). One end of the first top plate (21) is connected to the first blade (41), and the other end is provided with a mounting groove (211) that matches the mounting protrusion (221).

3. The adjustable circular coiling needle according to claim 1, characterized in that, The needle coil housing (1) includes a first housing (12) and a second housing (13) that are arranged together. Both the first housing (12) and the second housing (13) include an arc-shaped housing (14) and a housing base plate (15). The arc-shaped housing (14) and the housing base plate (15) form a semi-cylindrical structure. A clamping plate (16) is provided between the first housing (12) and the second housing (13). A clamping needle (17) is provided on the side of the clamping plate (16). The clamping needle (17) is located at the central axis of the needle coil housing (1).

4. An adjustable circular coiling needle according to claim 3, characterized in that, The clamping plate (16) has clamping grooves (18) on both sides of the clamping needle (17).

5. An adjustable circular coiling needle according to claim 3, characterized in that, The cavity (5) is provided with an arc-shaped boss (6) that protrudes from the bottom plate (15) of the outer shell to the arc-shaped outer shell (14). The length direction of the arc-shaped boss (6) is consistent with the length direction of the needle coiling shell (1). The arc-shaped boss (6) matches the first blade (41).

6. An adjustable circular coiling needle according to claim 5, characterized in that, The arc-shaped boss (6) has a first air hole (61) connected to the air valve (31) at one end near the sealing cover (3), and a second air hole (62) is provided on the arc surface of the arc-shaped boss (6). The first air hole (61) and the second air hole (62) are connected.

7. An adjustable circular coiling needle according to claim 6, characterized in that, The second air hole (62) is provided in multiple ways and is evenly spaced along the length of the arc-shaped boss (6).

8. An adjustable circular coiling needle according to claim 5, characterized in that, An airbag (7) is provided between the arc-shaped boss (6) and the first blade (41), and the airbag (7) is connected to the air valve (31).

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