A winding needle for winding a lithium battery core
By designing a winding needle for winding lithium battery cores, and utilizing the contraction and expansion mechanism of the clamping cavity, the problem of separator tearing and core loosening in the prior art is prevented, thus improving battery safety and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-05
AI Technical Summary
In the current lithium battery winding process, the winding needles are prone to scratching the separator, which leads to a decrease in battery safety and performance. Furthermore, loose cores result in a high scrap rate and increase production costs.
Design a needle winding device that includes a first half-coil needle and a second half-coil needle. Control the contraction and expansion of the clamping cavity through a drive component to prevent the diaphragm from being scratched and to prevent the core from loosening when the needle is pulled out. Use a flexible pad and rounded chamfers to reduce damage to the diaphragm.
It effectively prevents the separator from being scratched, reduces the scrap rate of the core, ensures battery safety and performance, and reduces production costs.
Smart Images
Figure CN224328725U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy battery technology, and in particular to a type of lithium battery core roll.
[0002] The coiled needle. Background Technology
[0003] Lithium-ion batteries are generally classified into wound batteries and stacked batteries. In the production process of wound batteries, the positive electrode, separator, and negative electrode are typically stacked and wound in a continuous sequence of "positive electrode-separator-negative electrode-separator" to form a multi-layered core. The separator completely encloses the positive and negative electrode sheets during this process, acting as an insulator while allowing lithium ions to pass through. Therefore, the separator is an important component of wound batteries.
[0004] In the prior art, the winding needles used for winding the core typically consist of two semi-cylindrical needles arranged symmetrically at intervals. During the core winding process, the mechanical structure of the winding machine feeds the heads of the stacked positive electrode, separator, and negative electrode into the space between the two semi-cylindrical needles, and applies a suitable force to make them adhere to one of the semi-cylindrical needles. Then, by rotating the two semi-cylindrical needles around their axis, the stacked positive electrode, separator, and negative electrode are wound around the outside of the two semi-cylindrical needles, thereby forming the core.
[0005] This winding method dramatically increases the risk of the innermost separator being scratched by the winding needles, which in turn adversely affects the battery's safety and electrical performance. Furthermore, after the core is wound, the winding needles need to be pulled out. Because the core is tightly wound around the outside of the two semi-cylindrical needles, the process of pulling out the needles can easily cause the core to loosen, resulting in its unusable state.
[0006] Based on this, a winding needle for winding lithium battery cores was designed. Utility Model Content
[0007] The purpose of this invention is to address the shortcomings of the prior art by providing a winding needle for winding lithium battery cores. This needle can prevent the separator from being scratched during the winding process and reduce the scrap rate of the cores, thereby ensuring battery safety and performance and reducing battery production costs.
[0008] This utility model proposes a winding needle for winding lithium battery cores, including a first half-winding needle and a second half-winding needle arranged in parallel and spaced apart, with a clamping cavity formed between the first half-winding needle and the second half-winding needle; as the first half-winding needle and the second half-winding needle move away from each other, the clamping cavity contracts, thereby clamping the head of the core material; as the first half-winding needle and the second half-winding needle move closer to each other, the clamping cavity expands, thereby releasing the head of the core material.
[0009] Furthermore, the winding needle also includes a driving member connecting the first half-winding needle and the second half-winding needle, the driving member being used to drive the first half-winding needle and the second half-winding needle to move closer or further apart from each other.
[0010] Furthermore, the first half-coil needle includes a first needle body and a first clamping member extending inside the first needle body, the second half-coil needle includes a second needle body and a second clamping member extending inside the second needle body, the driving member connects the first needle body and the second needle body, the first clamping member and the second clamping member are arranged crosswise, and the clamping cavity is formed between the first clamping member and the second clamping member.
[0011] Furthermore, the first clamping member includes a first connecting plate with one end connected to the inner side of the first needle body and the other end extending away from the first needle body, and a first clamping plate arranged parallel to and spaced apart from the inner side of the first needle body, the bottom of the first clamping plate being connected to the end of the first connecting plate extending away from the first needle body.
[0012] Furthermore, the second clamping member includes a second connecting plate with one end connected to the inner side of the second needle body and the other end extending away from the second needle body, and a second clamping plate disposed parallel to and spaced apart from the inner side of the second needle body, the bottom of the second clamping plate being connected to the end of the second connecting plate extending away from the second needle body.
[0013] Furthermore, the first connecting plate has a clearance hole in the middle, and the end of the second connecting plate extending away from the second needle body passes through the clearance hole, so that the first clamping plate is located between the second clamping plate and the second needle body, and the second clamping plate is located between the first clamping plate and the first needle body.
[0014] Furthermore, the top height of the first clamping plate is less than the top height of the first needle body, and the top height of the second clamping plate is less than the top height of the second needle body.
[0015] Furthermore, both the first clamping plate and the second clamping plate are provided with flexible pads, which extend from the opposite side of the first clamping plate and the second clamping plate to the top.
[0016] Furthermore, the driving component is a telescopic cylinder disposed between the first needle body and the second needle body, with both ends of the telescopic cylinder connected to the first needle body and the second needle body, respectively.
[0017] Furthermore, the telescopic cylinder includes a cylinder seat fixedly connected to the first needle body, and a cylinder rod telescopically connected to the cylinder seat, wherein one end of the cylinder rod away from the cylinder seat is fixedly connected to the second needle body.
[0018] The winding needle for winding lithium battery cores proposed in this utility model has the following beneficial effects:
[0019] (1) The first half-coil needle and the second half-coil needle move away from each other, causing the clamping cavity to contract, so that the clamping cavity clamps the head of the core material. Therefore, when the first layer of the core material is wound, the core material is directly wound from the clamping cavity to the arc surface outside the first half-coil needle or the second half-coil needle. It does not need to cross the tip of the intersection of the plane and the arc surface of the half-coil needle or the second half-coil needle, thereby preventing the innermost diaphragm of the core material from being scratched and ensuring the safety and performance of the battery.
[0020] (2) The first half-coil needle and the second half-coil needle approach each other, causing the clamping cavity to expand, so that the clamping cavity loosens the head of the core material. At this time, there is a gap between the first half-coil needle and the second half-coil needle and the core. Therefore, during the needle pulling process, it can prevent the core from being pulled, causing the core to loosen and resulting in the core being scrapped, thereby reducing the scrap rate of the core and thus reducing the production cost of the battery.
[0021] (3) This winding needle also includes a driving component, which connects the first half winding needle and the second half winding needle. The driving component drives the first half winding needle and the second half winding needle to move away from or closer to each other, thereby causing the clamping cavity to contract or expand, so that the clamping cavity clamps or releases the head of the winding core material.
[0022] (4) The first connecting plate of this coil of needles is provided with a clearance hole, and the end of the second connecting plate extending away from the second needle body passes through the clearance hole, so that the first connecting plate and the second connecting plate are arranged crosswise, so that the first clamping plate is located between the second clamping plate and the second needle body, and the second clamping plate is located between the first clamping plate and the first needle body. Then, when the first needle body and the second needle body move away from each other, the clamping cavity is driven to contract, and when the first needle body and the second needle body move closer, the clamping cavity is driven to expand.
[0023] (5) The height of the top of the first clamping plate is set to be less than the height of the top of the first needle body, and the height of the top of the second clamping plate is set to be less than the height of the top of the second needle body, so that the top height of the clamping cavity is less than the top height of the first needle body and the second needle body, thereby preventing the tip of the first or second needle body at the junction of the plane and the arc surface from scratching the innermost diaphragm of the core material, and also preventing the top of the first or second clamping plate from scratching the innermost diaphragm of the core material, further ensuring the safety and performance of the battery;
[0024] (6) Both the first and second clamping plates of this winding needle are provided with flexible pads. The flexible pads extend from one side of the first and second clamping plates to the top, which not only prevents the first and second clamping plates from damaging the winding core material when clamping it, but also further prevents the top of the first or second clamping plates from scratching the innermost diaphragm of the winding core material, thereby ensuring the safety and performance of the battery.
[0025] (7) Both the top of the first needle body and the second needle body of this winding needle are provided with rounded chamfers to further prevent the top of the first needle body or the second needle body from scratching the innermost diaphragm of the winding core material when the winding core material is wound from the top of the clamping cavity through the top of the first needle body or the second needle body to the arc surface outside the first needle body or the second needle body during the winding process of the first layer of the core material, thereby ensuring the safety and performance of the battery;
[0026] (8) The telescopic cylinder of this needle includes a cylinder seat and a cylinder rod. The cylinder seat is located on the inner side of the first needle body and is fixedly connected to the first needle body. The cylinder rod is telescopically connected to the cylinder seat, and the end away from the cylinder seat is fixedly connected to the second needle body. By extending or retracting the cylinder rod, the second needle body is driven away from or close to the first needle body, thereby realizing the contraction or expansion of the clamping cavity. Attached Figure Description
[0027] The accompanying drawings, which are incorporated in and constitute a part of this 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 denote similar elements.
[0028] Figure 1 This is a schematic diagram of the structure of a winding needle for winding lithium battery cores according to an embodiment of the present invention;
[0029] Figure 2 This is a schematic diagram of a winding needle for winding lithium battery cores according to an embodiment of the present invention, which winds core material into a core.
[0030] Figure 3 This is a schematic diagram of the structure of the first half of a winding needle for winding lithium battery cores according to an embodiment of the present invention.
[0031] Figure 4This is a schematic diagram of the structure of the second half of a winding needle for winding lithium battery cores according to an embodiment of the present invention.
[0032] Figure 5 This is a schematic diagram of the structure of a drive component for winding a lithium battery core, according to an embodiment of the present invention.
[0033] In the figure: 1. First half-coil needle; 11. First needle body; 12. First connecting plate; 121. Clearance hole; 13. First clamping plate; 131. Flexible pad; 2. Second half-coil needle; 21. Second needle body; 22. Second connecting plate; 23. Second clamping plate; 3. Clamping cavity; 4. Driving component; 41. Cylinder seat; 42. Cylinder rod; 5. Core material. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0035] Please see Figures 1-5 This utility model discloses a winding needle for winding lithium battery cores, comprising a first half-winding needle 1 and a second half-winding needle 2. The first half-winding needle 1 and the second half-winding needle 2 are arranged parallel and spaced apart, and a clamping cavity 3 is formed between the first half-winding needle 1 and the second half-winding needle 2. When the first half-winding needle 1 and the second half-winding needle 2 move away from each other, the clamping cavity 3 contracts, thereby clamping the head of the core material 5. When the first half-winding needle 1 and the second half-winding needle 2 move closer to each other, the clamping cavity 3 expands, thereby releasing the head of the core material 5.
[0036] In this application, the core material 5 is a multi-layered strip structure formed by continuously stacking positive electrode sheet, separator, and negative electrode sheet in the order of "positive electrode-separator-negative electrode-separator". During the winding process of the core, the head of the core material 5 is first fed into the clamping cavity 3 by the mechanical structure of the winding machine. Then, the first half-winding needle 1 and the second half-winding needle 2 are moved away from each other, causing the clamping cavity 3 to contract and clamp the head of the core material 5. Then, the first half-winding needle 1 and the second half-winding needle 2 are driven to rotate around the axis of the driving shaft by the drive shaft, and the strip-shaped core material 5 is wound around the outside of the first half-winding needle 1 and the second half-winding needle 2, thereby forming the core.
[0037] After the core material 5 is wound to form a core, the first half-winding needle 1 and the second half-winding needle 2 approach each other, causing the clamping cavity 3 to expand, so that the clamping cavity 3 releases the head of the core material 5, and then the first half-winding needle 1 and the second half-winding needle 2 are pulled out from the core, thereby completing the core winding process.
[0038] Traditional coiled needles are usually composed of two semi-cylindrical needles that are symmetrically spaced apart. The planes of the two semi-cylindrical needles are arranged opposite each other, while the arc surfaces are arranged opposite each other. That is, the planes of the two semi-cylindrical needles are arranged on the inside and the arc surfaces are arranged on the outside.
[0039] When winding the core, the mechanical structure of the winding machine feeds the head of the core material 5 between the planes on the inner sides of the two semi-cylindrical needles, and applies a suitable force to make it adhere to the plane on the inner side of one of the semi-cylindrical needles, thereby fixing the head of the core material 5 on the winding needle. Then, by rotating the two semi-cylindrical needles, the core material 5 is wound around the arc surface on the outer side of the two semi-cylindrical needles, thus forming the core.
[0040] When the first layer of core material 5 is wound, the core material 5 must first cross the junction of the inner plane and the outer arc surface of the semi-cylindrical needle fixed at its head, and then be wound on the outer arc surface of the semi-cylindrical needle. During this process, the tip of the junction of the inner plane and the outer arc surface of the semi-cylindrical needle is prone to scratching the innermost separator of the core material 5, which will have an adverse effect on the safety and performance of the battery.
[0041] It is foreseeable that the first half-coil needle 1 and the second half-coil needle 2 of this application are both semi-cylindrical structures, and the planes of the first half-coil needle 1 and the second half-coil needle 2 are arranged opposite each other, while the arc surfaces are arranged opposite each other, that is, the planes of the first half-coil needle 1 and the second half-coil needle 2 are arranged on the inner side, and the arc surfaces are arranged on the outer side.
[0042] In this application, after the mechanical structure of the winding machine feeds the head of the core material 5 into the clamping cavity 3, the clamping cavity 3 contracts as the first half-coiling needle 1 and the second half-coiling needle 2 move away from each other, thus clamping the head of the core material 5 and fixing it on the coiling needle. Therefore, when winding the first layer of the core material 5, the core material 5 is directly wound from the clamping cavity 3 to the outer arc surface of the first half-coiling needle 1 or the second half-coiling needle 2, without needing to cross the tip of the intersection of the plane and the arc surface of the first half-coiling needle 1 or the second half-coiling needle 2. This prevents the innermost diaphragm of the core material 5 from being scratched, ensuring the safety and performance of the battery.
[0043] In existing technology, after the core material 5 is wound into a core, the head of the core material 5 is first released by the mechanical structure of the winding machine so that it is no longer attached to the plane inside one of the semi-cylindrical needles, and then the two semi-cylindrical needles are pulled out from the core. In this process, there is a risk of the core being pulled, causing it to loosen, which in turn directly results in the core being scrapped.
[0044] In this application, after the core material 5 is wound to form a core, the first half-winding needle 1 and the second half-winding needle 2 approach each other, causing the clamping cavity 3 to expand. This allows the clamping cavity 3 to loosen the head of the core material 5, and then the first half-winding needle 1 and the second half-winding needle 2 are pulled out of the core. Because the first half-winding needle 1 and the second half-winding needle 2 are close to each other before the needles are pulled out, there is a gap between them and the core. Therefore, during the needle pulling process, the core can be prevented from being pulled, causing it to loosen and become unusable, thus reducing the scrap rate of the core and consequently reducing the production cost of the battery.
[0045] In this embodiment, the winding needle also includes a driving member 4, which connects the first half-winding needle 1 and the second half-winding needle 2. When winding the core material 5, the driving member 4 drives the first half-winding needle 1 and the second half-winding needle 2 to move away from each other, causing the clamping cavity 3 to contract, so that the clamping cavity 3 clamps the head of the core material 5.
[0046] After the core material 5 is wound to form a core, the first half-winding needle 1 and the second half-winding needle 2 are driven to approach each other by the driving component 4, which causes the clamping cavity 3 to expand, so that the clamping cavity 3 releases the head of the core material 5, and then the first half-winding needle 1 and the second half-winding needle 2 are pulled out from the core.
[0047] In this embodiment, the first half-coil needle 1 includes a first needle body 11 and a first clamping member extending inside the first needle body 11. The second half-coil needle 2 includes a second needle body 21 and a second clamping member extending inside the second needle body 21. The driving member 4 connects the first needle body 11 and the second needle body 21. The first clamping member and the second clamping member are arranged crosswise. The clamping cavity 3 is formed between the first clamping member and the second clamping member. In this application, both the first needle body 11 and the second needle body 21 are semi-cylindrical structures, and the planes of both the first needle body 11 and the second needle body 21 are located on the inner side, while the arc surfaces are located on the outer side.
[0048] Since the first clamping member extends inside the first needle body 11 and the second clamping member extends inside the second needle body 21, and the first clamping member and the second clamping member are arranged crosswise, the clamping cavity 3 is formed between the first clamping member and the second clamping member. Therefore, when the driving member 4 drives the first needle body 11 and the second needle body 21 away from each other, it drives the first clamping member and the second clamping member to move closer to each other, thereby shrinking the clamping cavity 3 so that the clamping cavity 3 can clamp the head of the core material 5; when the driving member 4 drives the first needle body 11 and the second needle body 21 to move closer to each other, it drives the first clamping member and the second clamping member to move away from each other, thereby expanding the clamping cavity 3 so that the clamping cavity 3 can release the head of the core material 5.
[0049] In this embodiment, the first clamping member includes a first connecting plate 12 and a first clamping plate 13. One end of the first connecting plate 12 is connected to the inner side of the first needle body 11, and the other end extends away from the first needle body 11. The bottom of the first clamping plate 13 is connected to the end of the first connecting plate 12 extending away from the first needle body 11, and the top extends vertically upward, so that the first clamping plate 13 and the inner side of the first needle body 11 are arranged parallel and spaced apart.
[0050] In this embodiment, the second clamping member includes a second connecting plate 22 and a second clamping plate 23. One end of the first connecting plate 22 is connected to the inner side of the second needle body 21, and the other end extends away from the second needle body 21. The bottom of the second clamping plate 23 is connected to the end of the second connecting plate 22 extending away from the second needle body 21, and the top extends vertically upward, so that the second clamping plate 23 and the inner side of the second needle body 21 are arranged parallel and spaced apart.
[0051] In this application, the inner sides of the first clamping plate 13 and the first needle body 11 are arranged parallel to each other and spaced apart, and the inner sides of the second clamping plate 23 and the second needle body 21 are arranged parallel to each other and spaced apart, thereby forming a clamping cavity 3 between the first clamping plate 13 and the second clamping plate 23.
[0052] As mentioned in the above embodiments, the first clamping member and the second clamping member are arranged crosswise. Specifically, in this embodiment, the first connecting plate 12 is provided with a clearance hole 121, and the end of the second connecting plate 22 extending away from the second needle body 21 passes through the clearance hole 121, so that the first connecting plate 12 and the second connecting plate 22 are arranged crosswise, thereby making the first clamping plate 13 located between the second clamping plate 23 and the second needle body 21, and the second clamping plate 23 located between the first clamping plate 13 and the first needle body 11.
[0053] Therefore, when the driving component 4 drives the first needle body 11 and the second needle body 21 to move away from each other, it can drive the first clamping plate 13 and the second clamping plate 23 to move closer to each other, thereby shrinking the clamping cavity 3 formed between the first clamping plate 13 and the second clamping plate 23.
[0054] When the driving component 4 drives the first needle body 11 and the second needle body 21 to approach each other, it can drive the first clamping plate 13 and the second clamping plate 23 to move away from each other, thus expanding the clamping cavity 3 formed between the first clamping plate 13 and the second clamping plate 23.
[0055] In this application, the tops of the first needle body 11 and the second needle body 21 are at the same height, and the tops of the first clamping plate 13 and the second clamping plate 23 are at the same height. Since the bottom of the first clamping plate 13 is connected to the first connecting plate 12 and the top extends vertically upward, and the bottom of the second clamping plate 23 is connected to the second connecting plate 22 and the top extends vertically upward, the clamping cavity 3 formed between the first clamping plate 13 and the second clamping plate 23 has an opening at the top.
[0056] When winding the core material 5, the head of the core material 5 is first fed into the clamping cavity 3 from the top opening of the clamping cavity 3 by the mechanical mechanism of the winding machine. Then, the core material 5 is wound from the top opening of the clamping cavity 3 to the arc surface outside the first needle body 11 or the second needle body 21, so that the core material 5 does not need to cross the tip of the intersection between the plane and the arc surface of the first needle body 11 or the second needle body 21.
[0057] Furthermore, in this embodiment, the height of the top of the first clamping plate 13 is set to be less than the height of the top of the first needle body 11, and the height of the top of the second clamping plate 23 is set to be less than the height of the top of the second needle body 21. This makes the top height of the clamping cavity 3 less than the top height of the first needle body 11 and the second needle body 21. Thus, during the winding process of the first layer of the core material 5, when the core material 5 passes from the top of the clamping cavity 3 and then passes the top of the first needle body 11 or the second needle body 21, and winds to the outer arc surface of the first needle body 11 or the second needle body 21, it prevents the tip of the first needle body 11 or the second needle body 21 at the junction of the plane and the arc surface from scratching the innermost diaphragm of the core material 5, and also prevents the top of the first clamping plate 13 or the second clamping plate 23 from scratching the innermost diaphragm of the core material 5, thereby further ensuring the safety and performance of the battery.
[0058] In this embodiment, a flexible pad 131 is provided on both the first clamping plate 13 and the second clamping plate 23. The flexible pad 131 extends from the opposite side of the first clamping plate 13 and the second clamping plate 23 to the top, which prevents the first clamping plate 13 and the second clamping plate 23 from damaging the core material 5 when they clamp it.
[0059] On the other hand, to further prevent the top of the first clamping plate 13 or the second clamping plate 23 from scratching the innermost diaphragm of the core material 5 when the core material 5 passes the top of the first needle body 11 or the second needle body 21 after passing the top of the clamping cavity 3 and then wraps to the outer arc surface of the first needle body 11 or the second needle body 21 during the winding of the first layer of the core material 5, thereby ensuring the safety and performance of the battery.
[0060] Furthermore, in this embodiment, the junction of the inner plane and the outer arc surface of the first needle body 11 and the second needle body 21 can be set as a rounded chamfer to further prevent the tips of the junction of the inner plane and the outer arc surface of the first needle body 11 and the second needle body 21 from scratching the innermost diaphragm of the core material 5 during the winding process of the core material 5, thereby ensuring the safety and performance of the battery.
[0061] In this embodiment, the driving component 4 is a telescopic cylinder. The telescopic cylinder is disposed between the first needle body 11 and the second needle body 21, and its two ends are respectively connected to the first needle body 11 and the second needle body 21. Thus, the telescopic cylinder pushes the first needle body 11 and the second needle body 21 away from each other or closer to each other, thereby driving the first clamping plate 13 and the second clamping plate 23 to move closer to each other or further away from each other, shrinking or expanding the clamping cavity 3, so that the clamping cavity 3 clamps or releases the head of the core material 5.
[0062] Specifically, in this embodiment, the telescopic cylinder includes a cylinder seat 41 and a cylinder rod 42. The cylinder seat 41 is disposed on the inner side of the first needle body 11 and is fixedly connected to the first needle body 11. The cylinder rod 42 is disposed at the end of the cylinder seat 41 away from the first needle body 11 and is telescopically connected to the cylinder seat 41, while the end of the cylinder rod 42 away from the cylinder seat 41 is fixedly connected to the second needle body 21.
[0063] When the cylinder rod 42 extends from the cylinder seat 41, it pushes the second needle body 21 to move away from the first needle body 11, thereby driving the second clamping plate 23 to move closer to the first clamping plate 13, causing the clamping cavity 3 formed between the first clamping plate 13 and the second clamping plate 23 to contract and clamp the head of the core material 5.
[0064] When the cylinder rod 42 retracts on the cylinder seat 41, it drives the second needle body 21 to move closer to the first needle body 11, thereby driving the second clamping plate 23 to move away from the first clamping plate 13, causing the clamping cavity 3 formed between the first clamping plate 13 and the second clamping plate 23 to expand and loosen the head of the core material 5.
[0065] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.
[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.
[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A winding needle for winding lithium battery cores, characterized in that: The device includes a first half-coil needle (1) and a second half-coil needle (2) arranged in parallel intervals, with a clamping cavity (3) formed between the first half-coil needle (1) and the second half-coil needle (2); as the first half-coil needle (1) and the second half-coil needle (2) move away from each other, the clamping cavity (3) contracts, so that the clamping cavity (3) clamps the head of the core material (5); as the first half-coil needle (1) and the second half-coil needle (2) move closer to each other, the clamping cavity (3) expands, so that the clamping cavity (3) releases the head of the core material (5).
2. A winding needle for winding lithium battery cores as described in claim 1, characterized in that: The coil needle also includes a drive member (4) connecting the first half-coil needle (1) and the second half-coil needle (2), the drive member (4) being used to drive the first half-coil needle (1) and the second half-coil needle (2) to move closer to or further away from each other.
3. A winding needle for winding lithium battery cores as described in claim 2, characterized in that: The first half-coil needle (1) includes a first needle body (11) and a first clamping member extending inside the first needle body (11). The second half-coil needle (2) includes a second needle body (21) and a second clamping member extending inside the second needle body (21). The driving member (4) connects the first needle body (11) and the second needle body (21). The first clamping member and the second clamping member are arranged crosswise. The clamping cavity (3) is formed between the first clamping member and the first clamping member.
4. A winding needle for winding lithium battery cores as described in claim 3, characterized in that: The first clamping member includes a first connecting plate (12) with one end connected to the inner side of the first needle body (11) and the other end extending away from the first needle body (11), and a first clamping plate (13) arranged parallel to and spaced apart from the inner side of the first needle body (11). The bottom of the first clamping plate (13) is connected to the end of the first connecting plate (12) extending away from the first needle body (11).
5. A winding needle for winding lithium battery cores as described in claim 4, characterized in that: The second clamping member includes a second connecting plate (22) with one end connected to the inner side of the second needle body (21) and the other end extending away from the second needle body (21), and a second clamping plate (23) arranged parallel to and spaced apart from the inner side of the second needle body (21). The bottom of the second clamping plate (23) is connected to the end of the second connecting plate (22) extending away from the second needle body (21).
6. A winding needle for winding lithium battery cores as described in claim 5, characterized in that: The first connecting plate (12) has a clearance hole (121) in the middle. The second connecting plate (22) extends through the clearance hole (121) at one end in a direction away from the second needle body (21), so that the first clamping plate (13) is located between the second clamping plate (23) and the second needle body (21), and the second clamping plate (23) is located between the first clamping plate (13) and the first needle body (11).
7. A winding needle for winding lithium battery cores as described in claim 5, characterized in that: The top height of the first clamping plate (13) is less than the top height of the first needle body (11), and the top height of the second clamping plate (23) is less than the top height of the second needle body (21).
8. A winding needle for winding lithium battery cores as described in claim 5, characterized in that: Both the first clamping plate (13) and the second clamping plate (23) are provided with flexible pads (131), which extend from the opposite side of the first clamping plate (13) and the second clamping plate (23) to the top.
9. A winding needle for winding lithium battery cores as described in claim 3, characterized in that: The driving component (4) is a telescopic cylinder located between the first needle body (11) and the second needle body (21), with both ends of the telescopic cylinder connected to the first needle body (11) and the second needle body (21) respectively.
10. A winding needle for winding lithium battery cores as described in claim 9, characterized in that: The telescopic cylinder includes a cylinder seat (41) fixedly connected to the first needle body (11) and a cylinder rod (42) telescopically connected to the cylinder seat (41), with one end of the cylinder rod (42) away from the cylinder seat (41) fixedly connected to the second needle body (21).