Winding needle and needle clamping mechanism capable of preventing inner part of winding core from wrinkling
By setting up multiple through holes on the needle and equipped with a left, right and upper pin clamping mechanism, the problem of pole sheet wrinkles during the round needle winding process is solved, and the stable unloading and stretching of the core is achieved, which improves the reliability and efficiency of battery production.
Patent Information
- Application Number
- CN202422210156.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The circular needle rolling easily leads to wrinkles of the negative electrode sheet during winding. Especially when the thickness of the electrode sheet is too thin, the traditional pin clamping structure cannot effectively support the electrode sheet, causing the electrode sheet to collapse and affect battery performance.
A multi-through hole rolling needle is adopted and a needle clamping mechanism is set on the left, right and upper side of the rolling needle. The three needle clamping mechanisms are inserted into the through hole to clamp the rolling core to prevent the pole sheet from collapse and provide stable support during the rolling core stretching process.
Effectively prevent the inner core of the pole sheets from wrinkling, ensuring that the pole sheets are not easily displaced during the process of unloading and stretching, and improving battery production efficiency and quality.
Smart Images
Figure CN223273328U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wound battery core production, and particularly relates to a winding needle and a clamping needle mechanism for preventing wrinkles inside a winding core. Background Art
[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.
[0003] Lithium-ion batteries are currently widely used in 3C digital products, power, and energy storage. Based on the core forming method, they can be divided into winding and lamination processes. The winding process is more mature and has higher production efficiency. The winding process uses the rotation of a winding needle to achieve the composite molding of the positive electrode, negative electrode, and separator.
[0004] Currently, winding needles are categorized into diamond, oval, and round shapes. The varying length-to-width ratios of diamond and oval shapes result in tension fluctuations during winding, limiting winding speeds. Round winding needles, with their consistent length and width, eliminate tension fluctuations during winding, significantly increasing winding speeds.
[0005] However, if Figure 1 As shown, the circular winding needle will have the problem of wrinkles on the inner circle of the negative electrode sheet, which is more obvious when the thickness of the electrode sheet is thin. This is because after the winding is completed, the traditional two-needle structure can only clamp the two ends of the winding core. When stretched, the upper part of the electrode sheet is not effectively supported and fixed, causing the electrode sheet to sag, causing lithium deposition on the negative electrode during the charge and discharge process, which is not allowed. Utility Model Content
[0006] In response to the above problems, the utility model provides a winding needle and clamping needle mechanism for preventing wrinkles inside the winding core. A winding needle with multiple through holes is adopted and clamping needle mechanisms are arranged on the left side, right side and upper side of the winding needle, so that the upper side, left side and right-right clamping needle mechanisms can be inserted into the through holes of the winding needle at the same time to clamp the wound winding core and separate the winding core from the winding needle, which is convenient for unloading and prevents the pole piece above the inside of the winding core from collapsing during the unloading process; and during the stretching process of the winding core, the pole piece is not easy to shift and collapse, thereby solving the problem of pole piece wrinkles inside the winding core.
[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0008] A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core, comprising a winding needle composed of two semicircular needle bodies with multiple through holes formed on the outer circumferential surface of the needle bodies. The spacing between two adjacent through holes on each semicircular needle body is the same. The winding needle is used to wind the winding core, and the through holes are used to insert the clamping needle mechanism.
[0009] There are three needle clamping mechanisms, two of which are arranged on both sides of the winding needle, and the other one is arranged above the winding needle.
[0010] Preferably, the winding needle is mounted on a winding mechanism, and the winding mechanism can drive the winding needle to rotate in a circle around the central axis of the winding needle.
[0011] Preferably, the needle clamping mechanism includes an inner clamping needle and an outer clamping needle, and both the inner clamping needle and the outer clamping needle are of columnar design.
[0012] Preferably, the contact surfaces between the inner clamping needle, the outer clamping needle and the winding core are all designed to be arc-shaped, and the curvature of the arc is 0.3-0.5.
[0013] Preferably, the length of the needle clamping mechanism is greater than the axial length of the winding core. When the needle clamping mechanism is inserted into the through hole of the winding needle, the opposite ends of the needle clamping mechanism protrude from the two ends of the winding core respectively.
[0014] Preferably, the three needle clamping mechanisms all have corresponding driving mechanisms, and the driving mechanism corresponding to a certain needle clamping mechanism is arranged on the same end side of the needle clamping mechanism.
[0015] Preferably, the driving mechanism includes a base, a first slide rail parallel to the axis of the winding core is provided on the base, two first mounting blocks are provided on the first slide rail, the bottom of the first mounting block is slidably connected to the first slide rail, and the first mounting block can slide on the first slide rail.
[0016] Preferably, the base is also provided with a first driving device for adjusting the position of the two first mounting blocks, and there are two first driving devices; a second slide rail is provided on the first mounting block, the second slide rail is perpendicular to the axis of the winding core, and the needle clamping mechanism is slidably provided on the second slide rail.
[0017] Preferably, each of the first mounting blocks is also provided with a second drive device for driving the clamping needle mechanism to move vertically along the winding core, wherein one second drive device is connected to one end of the inner clamping needle of the clamping needle mechanism, and the other second drive device is connected to the other end of the outer clamping needle of the clamping needle mechanism.
[0018] Compared with the prior art, the advantages and positive effects of this utility model are:
[0019] The utility model adopts a winding needle with multiple through holes and arranges clamping needle mechanisms on the left side, right side and upper side of the winding needle, so that the upper side, left side and right side clamping needle mechanisms can be inserted into the through holes of the winding needle at the same time, clamping the wound winding core and separating the winding core from the winding needle, which is convenient for unloading and prevents the pole piece above the winding core from collapsing during the unloading process; and in the process of stretching the winding core, the pole piece is not easy to shift and collapse, thereby solving the problem of pole piece wrinkles inside the winding core. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0021] Figure 1 This is a schematic diagram of the prior art using double clamping needles to clamp the winding core;
[0022] Figure 2 This is a schematic structural diagram of a winding needle according to an embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the needle clamping mechanism of the embodiment of the utility model being inserted into the winding needle;
[0024] Figure 4 This is a schematic diagram of the winding core of the embodiment of the utility model being stretched
[0025] In the picture:
[0026] 10. Winding needle; 20. Needle clamping mechanism; 30. Winding core. DETAILED DESCRIPTION
[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0028] The present invention will be described in detail below with reference to the accompanying drawings. This embodiment discloses a winding needle and a clamping needle mechanism for preventing wrinkles inside the winding core. Figure 2 、 Figure 3 As shown, it includes a winding needle 10, which is composed of two semicircular needle bodies. A plurality of through holes are opened on the outer circumferential surface of the needle body. On each semicircular needle body, the spacing between two adjacent through holes is the same. In this embodiment, each semicircular needle body is provided with 5 through holes, one of which is located on the symmetry line of the semicircular needle body, and the remaining four through holes are symmetrically distributed on both sides of the symmetry line of the semicircular needle body, and the interval angle between adjacent through holes is 30°; the winding needle 10 is used to wind the winding core 30, and the through holes are used to insert the clamping mechanism 20; as shown Figure 3 As shown, three needle clamping mechanisms 20 need to be inserted into the through hole of the winding needle 10, two of which are arranged on both sides of the winding needle and can clamp the left and right ends of the winding core, and the other needle clamping mechanism is arranged above the winding needle and can clamp and support the top of the winding core 30.
[0029] In this embodiment, the winding needle is installed on the existing winding mechanism, and the winding mechanism can drive the winding needle to rotate around the central axis of the winding needle; the winding needle 10 winds the winding core by rotating. When the winding of the core is completed, since a plurality of through holes are provided on the outer circumferential surface of the winding needle 10 for inserting the needle clamping mechanism 20, there is no need to specially adjust the angle of the winding needle; the insertion of the needle clamping mechanism is convenient, so that the winding needle can be cut at multiple angles, thereby increasing the flexibility of debugging and production.
[0030] like Figure 3 As shown, the clamping needle mechanism 20 includes an inner clamping needle and an outer clamping needle. Both the inner clamping needle and the outer clamping needle are of cylindrical design, but the contact surfaces of the inner clamping needle, the outer clamping needle and the winding core 30 are designed to be arc-shaped, and the curvature of the arc is 0.3-0.5. The arc treatment here is to make the inner clamping needle and the outer clamping needle fit better with the winding core 30 without clamping the winding core. It can be understood that the inner clamping needle is inserted into the through hole, and the outer clamping needle is outside the winding core and cooperates with the inner clamping needle to clamp the winding core; the outer clamping needle and the inner clamping needle are of the same length.
[0031] like Figure 3 As shown, the winding core 30 refers to the battery cell that has been wound on the winding needle 10. The inner clamping needles of the three clamping needle mechanisms 20 are inserted into the through holes of the winding needle 10 in the left, right and top directions of the winding needle 10 respectively. The arc ends of the inner clamping needles press against the innermost circle of the winding core 30, and the arc ends of the outer clamping needles press against the outermost circle of the winding core 30.
[0032] It should be noted that the length of the needle clamping mechanism 20 is greater than the axial length of the winding core 30, that is, when the needle clamping mechanism 20 is inserted into the through hole of the winding needle 10, the opposite ends of the needle clamping mechanism 20 should protrude from the two ends of the winding core 30 respectively.
[0033] like Figure 4 As shown, three clamping needle mechanisms 20 are used to remove the winding core 30 from the winding needle 10, and then the winding core 30 is stretched under the action of the clamping needle mechanisms 20 on the left and right sides. At the same time, the upper clamping needle mechanism 20 moves downward synchronously to prevent the pole piece above the inside of the winding core 30 from collapsing during the stretching process.
[0034] It can be understood that each needle clamping mechanism 20 is provided with a corresponding driving mechanism, wherein the needle clamping mechanism 20 on the left is driven by a first driving structure (not shown in the figure), the needle clamping mechanism 20 on the right is driven by a second driving mechanism (not shown in the figure), and the needle clamping mechanism 20 on the upper side is driven by a third driving mechanism (not shown in the figure).
[0035] Among them, the first drive structure is arranged on the same end side of the left needle clamping mechanism, the second drive structure is arranged on the same end side of the right needle clamping mechanism, and the third drive structure is arranged on the same end side of the upper needle clamping mechanism; the first drive structure, the second drive structure, and the third drive structure are the same and have the same structure, the difference lies in the different installation positions.
[0036] The drive structure includes a base, which is used to mount the drive mechanism in a corresponding position. The base is provided with a first slide rail parallel to the axis of the winding core, and two first mounting blocks are provided on the first slide rail. The bottom of the first mounting block is slidably connected to the first slide rail, and the first mounting block can slide on the first slide rail.
[0037] The base is also provided with a first driving device for adjusting the position of the two first mounting blocks, and there are two first driving devices; the first mounting block is provided with a second slide rail, the second slide rail is perpendicular to the axis of the winding core, and the needle clamping mechanism is slidably provided on the second slide rail.
[0038] It can be understood that each first mounting block is also provided with a second drive device for driving the needle clamping mechanism to move axially vertically to the winding core, wherein one second drive device is connected to one end of the inner needle of the needle clamping mechanism, and the other second drive device is connected to the other end of the outer needle of the needle clamping mechanism; the inner needle and the outer needle of the needle clamping mechanism are driven by corresponding first drive devices and second drive devices; the first drive device and the second drive device can use conventional linear drive structures such as cylinders, linear motors, and ball screw modules equipped with motors.
[0039] First, adjust the inner clamping needle. Use the corresponding first drive device to adjust the inner clamping needle of the clamping needle mechanism so that it is axially away from the winding core. Then use the corresponding second drive device to adjust the inner clamping needle so that its axial projection can be within the winding needle through-hole. Use the first drive device to adjust the inner clamping needle of the clamping needle mechanism so that it is gradually inserted into the through-hole of the winding needle in the axial direction of the winding core until the inner clamping needle passes through the through-hole. Then adjust the second drive device to make the inner clamping needle close to the inner side of the winding core near the drive mechanism on this side. Next, adjust the outer clamping needle. Use the corresponding second drive device to make the outer clamping needle close to the inner clamping needle, thereby clamping the winding core.
[0040] It's understandable that this step is performed synchronously by the three drive mechanisms, which insert the three clamping pins into the corresponding through-holes of the winding needle and then clamp the core. Next, all the first drive mechanisms are adjusted to move the clamping pins along the axis of the core, removing the core from the winding needle. During this process, the upper portion of the core is supported by the upper clamping pins, preventing the upper pole piece inside the core from losing support and collapsing downward.
[0041] After the core is unloaded from the winding needle, it is stretched. This step requires the joint participation of three clamping needle mechanisms. During this process, the left and right clamping needle mechanisms are driven by their respective driving mechanisms to move toward the side away from each other, which makes the core stretched left and right. While the left and right clamping needle mechanisms move, the upper clamping needle mechanism will move downward, so that when the left and right sides of the core are stretched, the upper part of the core can fall steadily, thereby preventing the upper pole piece of the core from collapsing during the stretching process.
[0042] After stretching is completed, the core is pre-pressed. It can be understood that the pre-pressing device adopts an existing device with two upper and lower pre-pressing plates. The two pre-pressing plates are driven by their respective pre-pressing drive structures to press the core from a round shape to a square shape.
[0043] During pre-pressing, the upper clamping mechanism is first withdrawn, followed by pre-pressing. After pre-pressing reaches a certain level, the left and right clamping mechanisms are withdrawn, and the core is pre-pressed again. The negative electrode sheet inside the pressed core is wrinkle-free. This device is highly feasible, simple, and effective, and can be used for mass production.
[0044] Working principle:
[0045] The winding needle is installed on the corresponding winding mechanism. The winding mechanism can drive the winding needle to rotate around the central axis of the winding needle so as to wind the positive electrode sheet, negative electrode sheet and isolation film on its outer circumference and wind them into a core. When winding, the isolation film is first rolled 1.5 times, and then the positive electrode sheet and negative electrode sheet begin to be fed. After winding to a specific length, the positive electrode sheet and negative electrode sheet are cut, and the isolation film is rolled 1.5 times and then cut. Finally, the core is finished and glued.
[0046] Next, the three clamping needle mechanisms on the left, right and upper sides are inserted into the through holes of the winding needles under the drive of their respective driving mechanisms and clamp the winding core. Then, driven by their respective driving mechanisms, the winding core is clamped and separated from the winding needles to complete the unloading.
[0047] Then, the winding core is stretched by the clamping needle mechanisms on the left and right sides, and at the same time, the clamping needle mechanism on the upper side moves downward synchronously to prevent the pole piece on the upper part of the winding core from collapsing during the stretching process.
[0048] Finally, the stretched core is pre-pressed. Before the pre-pressing begins, the upper clamping needle mechanism is pulled out of the core and then pre-pressing begins. The pre-pressing is carried out in two steps. First, it is pre-pressed to a certain height. At this time, the clamping needle mechanisms on the left and right sides pull out the core, and then the core is pre-pressed again to complete the pressing work.
[0049] By adopting a winding needle with multiple through holes and clamping needle mechanisms in the left, right and upper directions, the upper clamping needle and the left and right clamping needle mechanisms can be inserted into the through holes of the winding needle at the same time, clamping the wound core and separating the core from the winding needle, making it easy to unload the material, and at the same time preventing the pole piece above the core from collapsing during the unloading process; and during the stretching of the core, the pole piece is not easy to shift and collapse, thereby solving the problem of pole piece wrinkles inside the core.
[0050] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.
Claims
1. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core, characterized in that: The winding needle comprises two semicircular needle bodies, with a plurality of through holes formed on the outer circumferential surface of the needle body. On each semicircular needle body, the spacing between two adjacent through holes is the same; the winding needle is used to wind the winding core, and the through holes are used to insert the needle clamping mechanism; There are three needle clamping mechanisms, two of which are arranged on both sides of the winding needle, and the other one is arranged above the winding needle.
2. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core according to claim 1, characterized in that: The winding needle is installed on the winding mechanism, and the winding mechanism can drive the winding needle to rotate around the central axis of the winding needle.
3. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 1, characterized in that: The clamping needle mechanism includes an inner clamping needle and an outer clamping needle. Both the inner clamping needle and the outer clamping needle are columnar in design. The inner clamping needle is inserted into the through hole, and the outer clamping needle and the inner clamping needle cooperate to clamp the winding core.
4. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 3, characterized in that: The contact surfaces of the inner clamping needle, the outer clamping needle and the winding core are all designed to be arc-shaped, and the curvature of the arc is 0.3-0.
5.
5. The winding needle and clamping needle mechanism for preventing wrinkles inside the winding core according to claim 1, characterized in that: The length of the clamping needle mechanism is greater than the axial length of the winding core. When the clamping needle mechanism is inserted into the through hole of the winding needle, the opposite ends of the clamping needle mechanism protrude from the two ends of the winding core respectively; the length of the outer clamping needle is consistent with that of the inner clamping needle.
6. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 1, characterized in that: The three needle clamping mechanisms all have corresponding driving mechanisms, and the driving mechanism corresponding to a certain needle clamping mechanism is arranged on the same end side of the needle clamping mechanism.
7. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 6, characterized in that: The driving mechanism comprises a base, a first slide rail parallel to the axial direction of the winding core is arranged on the base, and two first mounting blocks are slidably arranged on the first slide rail.
8. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 7, characterized in that: The base is also provided with a first driving device for adjusting the position of the two first mounting blocks, and there are two first driving devices; the first mounting block is provided with a second slide rail, the second slide rail is perpendicular to the axis of the winding core, and the needle clamping mechanism is slidably provided on the second slide rail.
9. A winding needle and clamping needle mechanism for preventing wrinkles inside a winding core as claimed in claim 7, characterized in that: Each of the first mounting blocks is also provided with a second driving device for driving the clamping needle mechanism to move vertically to the axial direction of the winding core, wherein one of the second driving devices is connected to one end of the inner clamping needle of the clamping needle mechanism, and the other is connected to the other end of the outer clamping needle of the clamping needle mechanism.