Winding needle for cylindrical battery
By opening grooves and rounded corners on the outer surface of the cylindrical battery winding needle, the problem of high friction between the needle and the diaphragm and the pole sheet is solved, and the effect of easy needle extraction and improved yield is achieved.
Patent Information
- Application Number
- CN202422394671.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-09-30
AI Technical Summary
When existing cylindrical batteries are wound, the friction between the needle and the diaphragm and the pole plate is large, which leads to difficulty in removing the needle, which easily leads to poor core extraction, reduces product yield and increases production costs.
A winding needle for cylindrical batteries is designed. The outer surface of the winding needle is equipped with axial or spiral grooves to reduce the contact area with the diaphragm and pole sheet, and round the corners at the edge of the butt surface, and the surface coating is treated to reduce friction.
It reduces the difficulty of removing the needle, reduces the risk of damage to the diaphragm and pole sheet, improves product yield and reduces production costs.
Smart Images
Figure CN223260629U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of winding needles, and particularly relates to a winding needle for cylindrical batteries. Background Art
[0002] Lithium-ion batteries have the advantages of small size, large capacity, long service life, low self-discharge rate, no memory effect, and green environmental protection. They are currently widely used in commercial vehicles, special-purpose vehicles, electric bicycles, energy storage systems, medical equipment and other fields.
[0003] Existing cylindrical battery cell winding machines basically use two semi-cylindrical winding needles. During winding, the diaphragm passes through the gap between the two semi-cylinders and is clamped. The two semi-circular winding needles merge into a whole and begin to drive the diaphragm and the electrode to be wound together. When the battery cell diameter reaches the target requirement, the two semi-circular winding needles are pulled out from the center of the battery cell in turn, and the cylindrical battery cell completes the winding process.
[0004] Existing cylindrical batteries consist of two semi-cylinder structures. Because both the electrode and separator are wound under tension, as the core diameter increases, the internal compressive force exerted on the winding needle by the electrode and separator increases. After the cell is completely wound, the internal compressive force exerted on the winding needle causes significant friction between the needle and separator, making needle removal difficult and potentially resulting in poor separation of the separator and electrode from the center of the core. These drawbacks can reduce production line yields and increase manufacturing costs. Utility Model Content
[0005] The purpose of the utility model is to provide a winding needle for cylindrical batteries, which reduces the contact area between the outer surface of the winding needle and the diaphragm, reduces the difficulty of pulling out the needle, reduces the risk of poor core pulling at the center of the winding core when pulling out the needle, and ensures product yield.
[0006] The technical solution adopted by the present invention to solve its technical problems is to propose a winding needle for cylindrical batteries, including a first needle body and a second needle body, the first needle body including a winding holding portion and a first half needle, and a docking seat is provided on the upper part of the winding holding portion; the second needle body includes a docking portion and a second half needle, and the docking portion is spliced on the docking seat, so that the first half needle and the second half needle are combined into a winding needle, and a groove for reducing the contact area is provided on the outer surface of the winding needle, and the groove extends from the front end of the winding needle to the tail end of the winding needle.
[0007] Furthermore, the winding needle is cylindrical, the groove is threaded, and the two half needles are semi-cylindrical, and the two half needles are spliced together to form a cylindrical winding needle.
[0008] Furthermore, the groove is linear, and the edges of the groove walls are rounded.
[0009] Furthermore, the edges of the butt joint surfaces of the first half needle and the second half needle are chamfered, so that chamfered grooves are symmetrically formed on both sides of the winding needle.
[0010] Furthermore, the groove passes through the chamfered groove or the groove and the chamfered groove are arranged in parallel on the surface of the winding needle.
[0011] Furthermore, the front end of the winding needle is provided with an eight-shaped socket, and the opening of the socket faces outward.
[0012] Furthermore, a first bevel is provided on the inner side of the front end of the first half needle, and a second bevel is provided on the inner side of the front end of the second half needle. The first bevel is symmetrical to the second bevel, and the first bevel and the second bevel are spliced together to form the socket.
[0013] Furthermore, the winding part is a cylinder, and the upper part of the winding part includes a half-axis body divided in half along the axial direction and the docking seat formed after dividing in half along the axial direction and removing one half-axis body. The docking part is a semi-cylinder, and the docking part and the semi-axis body are spliced to form a cylinder.
[0014] Furthermore, the first half needle is provided at the upper end of the semi-axial body, and the docking surface of the first half needle is flush with the bisecting section of the semi-axial body; the second half needle is provided at the upper end of the docking portion, and the docking surface of the second half needle is flush with the semi-axial surface of the docking portion; the length of the first half needle is the same as the length of the second half needle.
[0015] Furthermore, a through-type first positioning hole group is provided at the lower part of the winding portion, and a through-type second positioning hole group is provided on the docking portion. The first positioning hole group is used to fix the winding needle, and the second positioning hole group is used to fix the second needle body on the first needle body to form the winding needle.
[0016] Furthermore, the surface of the winding needle is provided with a coating, and the coating is used to prevent rust, reduce friction, etc.
[0017] The beneficial effects of the utility model are:
[0018] The utility model proposes a winding needle for cylindrical batteries, which has axial or spiral grooves on the surface of the winding needle, reducing the contact area between the outer surface of the winding needle and the diaphragm and the electrode, reducing the difficulty of pulling out the needle, reducing the occurrence of poor core pulling in the center of the winding core when pulling out the needle, and reducing production costs.
[0019] The edges of the joint surfaces of the two semi-cylindrical half needles are chamfered and the surface is coated. This can not only ensure that the outer ring of the winding needle is a circular structure without affecting the winding of the core, but also reduce the contact area between the winding needle and the diaphragm and electrode, reduce the occurrence of needle extraction defects, and improve the winding yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.
[0021] Figure 1 This is a front structural diagram of a winding needle for cylindrical batteries according to an embodiment of the present utility model;
[0022] Figure 2 It is a schematic diagram of the combination of winding needles;
[0023] Figure 3 This is a disassembly diagram of the winding needle;
[0024] Figure 4 This is a diagram of the head structure of the winding needle.
[0025] In the figure: 1. First needle body; 2. Second needle body; 3. Winding needle; 4. Groove; 5. Chamfered groove; 6. Socket; 11. Winding portion; 12. First positioning hole group; 13. First half needle; 21. Docking portion; 22. Second positioning hole group; 23. Second half needle. DETAILED DESCRIPTION
[0026] To more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following describes specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings described below are merely examples of the present invention. A person skilled in the art can, without inventive effort, derive other drawings and other embodiments from these drawings. Furthermore, design orientations only represent relative positional relationships between components, not absolute positional relationships.
[0027] The present invention provides a winding needle for cylindrical batteries. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 It mainly includes a first needle body 1 and a second needle body 2. The first needle body 1 includes a winding part 11 and a first half needle 13. A docking seat is provided on the upper part of the winding part 11; the second needle body 2 includes a docking part 21 and a second half needle 23. The docking part 21 is spliced on the docking seat so that the first half needle 13 and the second half needle 23 are combined into a winding needle 3. A groove 4 is provided on the outer surface of the winding needle 3. The groove 4 extends from the front end of the winding needle 3 to the tail end of the winding needle 3.
[0028] In this application, the winding needle can be divided into two parts based on its function. One is the winding needle 3 for winding the diaphragm and pole piece, and the other is the driving unit for providing a force point or power. The driving unit is located at the rear end of the winding needle and can be used to drive the winding needle to rotate. The driving unit can be manually operated, in which case the driving unit provides the force point and the staff can manually perform the winding. The driving unit can also be connected to the winding motor, in which case the driving unit can directly provide the winding power. After winding is completed, the winding needle can be pulled out.
[0029] The driving portion corresponds to the structure formed by splicing the winding portion 11 and the docking portion 21, as shown in FIG. Figure 2 As shown in , the structure is located at the tail end of the winding needle 3 and can be used for hand-held grasping or instrument fixing to achieve driving of the winding needle.
[0030] In the present application, the winding needle is structurally divided into a first needle body 1 and a second needle body 2. The first needle body 1 includes a winding portion 11 and a first half needle 13, and a docking seat is provided on the upper part of the winding portion 11; the second needle body 2 includes a docking portion 21 and a second half needle 23; wherein, the docking portion 21 and the docking seat can be spliced together, and by splicing the docking portion 21 onto the docking seat, the first half needle 13 and the second half needle 23 can be merged into a winding needle 3.
[0031] A groove 4 is provided on the outer surface of the winding needle 3 to reduce the friction between the outer surface of the winding needle 3 and the diaphragm and the electrode, thereby reducing the difficulty of pulling out the winding needle 3, reducing the risk of damage to the diaphragm and the electrode by the winding needle 3, and ensuring the product yield.
[0032] In the actual production process, the winding needle 3 is designed for different battery sizes. The winding needle 3 may be used in the winding production process of diaphragms and electrodes of various sizes. This makes it impossible to determine the insertion depth of the winding needle 3 during use. Therefore, if a groove 4 is designed on the outer surface of the winding needle 3, it should be designed to cover the working area of the winding needle 3 as much as possible.
[0033] Since the insertion depth of the winding needle 3 is uncertain, the groove 4 can be extended from the front end of the winding needle 3 to the tail end of the winding needle 3, so that when the winding needle 3 is in use, the contact friction between any section of the winding needle 3 with the same length and the diaphragm is similar; preferably, close to the same.
[0034] It can be understood that any section of the winding needle 3 is determined by its axial direction, that is, in the axial direction of the winding needle 3, the friction between two sections of the winding needle 3 at different positions but the same length and the diaphragm and pole piece are similar or even the same.
[0035] In the embodiment of the present application, the groove 4 is in an inwardly concave form. When the winding needle 3 is pulled out, in order to reduce the damage of the groove 4 to the diaphragm and the pole piece, the groove 4 can be opened along the axial direction or arranged in a spiral state.
[0036] In a specific embodiment, the groove 4 provided on the outer surface of the winding needle 3 may be in a threaded shape, spirally extending downward from the front end of the winding needle 3 to the rear end of the winding needle 3 , and the bottom of the groove 4 may be in an arc shape.
[0037] In another feasible embodiment, the groove 4 may be linear, the bottom of the groove 4 may be arc-shaped, and the edges of the groove wall may be rounded to achieve a smooth transition between the groove 4 and the outer surface of the winding needle 3 .
[0038] Taking the winding needle 3 as an example of a typical cylindrical needle body structure, on the basis of providing the groove 4, the overall structure of the winding needle 3 can remain cylindrical without affecting the winding of the winding core.
[0039] The material of the winding needle can be high-strength metal or non-metal material, and the surface of the winding needle is coated with a layer of friction-reducing coating.
[0040] The winding method of the winding needle of the present application is consistent with the traditional cylindrical battery winding method. During winding, the diaphragm and the electrode are passed through the gap between the two semicircular needles and clamped. The two semicircular half needles are merged into a cylindrical winding needle 3 to start winding the diaphragm and the electrode together. After the winding is completed, the two half needles can be pulled out one by one.
[0041] In the present application, since the winding needle 3 is composed of two half needles, the axial section of the half needle is the butt joint surface, and the two half needles are bonded together with the butt joint surfaces to form the winding needle 3, and the outer surface of the winding needle 3 no longer contains two butt joint surfaces. When the winding needle 3 is pulled out, the contact area between the butt joint surface and the diaphragm and the pole piece remains unchanged. The groove 4 opened on the outer surface of the winding needle 3 can reduce the contact area between the outer surface of the winding needle 3 and the diaphragm and the pole piece when the winding needle 3 is pulled out, thereby reducing friction and facilitating the pulling out of the winding needle 3.
[0042] When pulling out the winding needle, the winding needle can be pulled out directly without disassembling it; or the connection between the first needle body 1 and the second needle body 2 can be released first, and then the first needle body 1 is pulled out, and then the second needle body 2 is pulled out.
[0043] In the embodiment of the present application, the two half needles can be semi-cylinders, and each half needle occupies half of the needle body structure of half of the coiled needle 3. After the two half needles are aligned and spliced together, a complete coiled needle 3 can be obtained.
[0044] Since the first half needle 13 and the second half needle 23 are spliced, there is a risk of scratching or damaging the diaphragm and the electrode at the edges of the butt joints. Therefore, the edges of the butt joints can be rounded so that after the two half needles are spliced, chamfered grooves 5 are symmetrically formed on both sides of the winding needle 3, as shown in FIG. Figure 4 As shown in , the formation of the chamfered groove 5 can also reduce the friction between the winding needle 3 and the diaphragm and the pole piece, making it easier to pull out the winding needle 3.
[0045] It is understandable that the formation of the groove 4 does not conflict with the formation of the chamfered groove 5 . When the groove 4 is spiral, it can directly penetrate the chamfered groove 5 ; when the groove 4 is linear, it can be parallel to the chamfered groove 5 .
[0046] In a specific embodiment, the above two opening methods of the groove 4 can be implemented simultaneously, and the chamfered groove 5 can be used as a linear groove 4, and another set of spiral grooves 4 are opened, and the spiral grooves 4 pass through the chamfered groove 5, such as Figure 4 As shown in .
[0047] In the embodiment of the present application, the front end of the winding needle 3 is provided with an eight-shaped socket 6, and the opening of the socket 6 is outward, so that the winding needle 3 can be inserted into the diaphragm and the electrode. The socket 6 can be set based on the composition structure of the winding needle 3. For example, a first bevel can be provided on the inner side of the front end of the first half needle 13, and a second bevel can be provided on the inner side of the front end of the second half needle 23. The first bevel is symmetrical to the second bevel, and the first bevel and the second bevel are spliced to form the socket 6, as shown in FIG. Figure 4 As shown in .
[0048] In this application, the winding portion 11 is preferably a cylinder, and a docking seat and a docking portion 21 are arranged based on the cylindrical structure. The docking portion 21 fills the missing part of the structure of the docking seat, so that the docking portion 21 and the winding portion 11 are spliced to form a relatively complete cylindrical structure, namely the driving portion.
[0049] Exemplarily, the upper portion of the winding portion 11 includes a semi-axle body divided in half along the axial direction and a docking seat formed by dividing in half along the axial direction and removing one of the semi-axle bodies. The docking portion 21 is a semi-cylinder, and the docking portion 21 and the semi-axle body are spliced together to form a cylinder.
[0050] A docking seat is provided on the upper part of the winding holding part 11, and a docking space for the docking part 21 is reserved. The size of the docking part 21 can match the docking space, so that the docking part 21 and the winding holding part 11 can be spliced together to form a relatively complete cylindrical structure, which is the driving part of the winding needle; at the same time, the first half needle 13 located at the upper end of the winding holding part 11 and the second half needle 23 located at the upper end of the docking part 21 also synchronously complete the splicing to form the winding needle 3, and the first needle body 1 and the second needle body 2 in this state can be fixed.
[0051] Exemplarily, a first half needle 13 is provided at the upper end of the semi-axial body, and the docking surface of the first half needle 13 is flush with the bisecting surface of the semi-axial body; a second half needle 23 is provided at the upper end of the docking portion 21, and the docking surface of the second half needle 23 is flush with the semi-axial surface of the docking portion 21; so that after the docking portion 21 is docked with the winding portion 11, the two half needles can be aligned and spliced.
[0052] The size of the docking portion 21 is just sufficient to fill the missing structure of the winding portion 11, such as the length of the docking portion 21 is the same as the length of the docking seat, and the radius of the docking portion 21 is the same as the radius of the winding portion 11; at the same time, as a preference, the length of the first half needle 13 is the same as the length of the second half needle 23, so that the socket 6 involved based on the two half needles can be constructed synchronously.
[0053] Of course, the lengths of the two half needles may also be different. In this case, the inclined surface design on the inner side of the front end of the two half needles can still be retained. The inclined surface on the shorter half needle corresponds to the docking surface of the longer half needle, forming a half socket that is half the size of socket 6, and the half socket still has the effect of socket 6.
[0054] The second needle body 2 can be fixed to the first needle body 1 through the docking part 21, and the transmission connection of the winding needle 3 can be realized through the partial structure of the winding part 11. Of course, the driving part can also be manually operated. At this time, the driving part should be the structure after the winding part 11 and the docking part 21 are spliced together.
[0055] Exemplarily, a through-type first positioning hole group 12 is provided at the lower part of the winding portion 11, and a through-type second positioning hole group 22 is provided on the docking portion 21. The first positioning hole group 12 is used to fix the winding needle, and the second positioning hole group 22 is used to fix the second needle body 2 on the first needle body 1 to form a winding needle.
[0056] Among them, the first positioning hole group 12 is arranged at the lower part of the winding and holding part 11, that is, below the docking seat; it can be used for positioning and installing the driving part, establishing a transmission relationship, etc.; the second positioning hole group 22 is only arranged on the docking part 21, and can cooperate with the semi-axis body of the winding and holding part 11 to fix the second needle body 2, and fix the second needle body 2 on the first needle body 1.
[0057] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.
[0058] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention are not limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.
Claims
1. A winding needle for cylindrical batteries, characterized in that: The invention comprises a first needle body (1) and a second needle body (2), wherein the first needle body (1) comprises a winding portion (11) and a first half needle (13), and a docking seat is provided on the upper portion of the winding portion (11); the second needle body (2) comprises a docking portion (21) and a second half needle (23), and the docking portion (21) is spliced on the docking seat so that the first half needle (13) and the second half needle (23) are combined into a winding needle (3), and a groove (4) is provided on the outer surface of the winding needle (3), and the groove (4) extends from the front end of the winding needle (3) to the rear end of the winding needle (3).
2. A winding needle for cylindrical batteries according to claim 1, characterized in that: The winding needle (3) is cylindrical, and the groove (4) is threaded.
3. The winding needle for cylindrical batteries according to claim 1, characterized in that: The groove (4) is linear, and the groove wall edge of the groove (4) is rounded.
4. The winding needle for cylindrical batteries according to claim 1, characterized in that: The edges of the butt joint surfaces of the first half needle (13) and the second half needle (23) are both chamfered, so that chamfered grooves (5) are symmetrically formed on both sides of the winding needle (3).
5. The winding needle for cylindrical batteries according to claim 4, characterized in that: The groove (4) passes through the chamfered groove (5), or the groove (4) and the chamfered groove (5) are arranged in parallel on the surface of the winding needle (3).
6. The winding needle for cylindrical batteries according to claim 1, characterized in that: The front end of the winding needle (3) is provided with an eight-shaped socket (6), and the opening of the socket (6) faces outward.
7. The winding needle for cylindrical batteries according to claim 6, characterized in that: A first bevel is provided on the inner side of the front end of the first half needle (13), and a second bevel is provided on the inner side of the front end of the second half needle (23). The first bevel is symmetrical to the second bevel, and the first bevel and the second bevel are spliced together to form the socket (6).
8. The winding needle for cylindrical batteries according to claim 1, characterized in that: The winding portion (11) is a cylinder, the upper portion of the winding portion (11) comprises a half-axis body bisected along the axial direction and the docking seat formed by bisecting along the axial direction and removing the half-axis body, the docking portion (21) is a semi-cylinder, and the docking portion (21) and the semi-axis body are spliced to form a cylinder.
9. The winding needle for cylindrical batteries according to claim 8, characterized in that: The first half needle (13) is provided at the upper end of the semi-axial body, and the docking surface of the first half needle (13) is flush with the bisecting section of the semi-axial body; the second half needle (23) is provided at the upper end of the docking portion (21), and the docking surface of the second half needle (23) is flush with the semi-axial surface of the docking portion (21); the length of the first half needle (13) is the same as the length of the second half needle (23).
10. The winding needle for cylindrical batteries according to claim 8, characterized in that: A through-type first positioning hole group (12) is provided at the lower portion of the winding portion (11), and a through-type second positioning hole group (22) is provided on the docking portion (21). The first positioning hole group (12) is used to fix the winding needle, and the second positioning hole group (22) is used to fix the second needle body (2) on the first needle body (1) to form the winding needle.