Battery cell winding needle structure
By setting chamfers on the needle body of the cell coil structure, the sticky and adsorption problem between the head diaphragm and the second layer of the cell core is solved, and the consistency of the cell thickness and energy density are improved.
Patent Information
- Application Number
- CN202421049495.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-05-13
AI Technical Summary
In the existing battery cell coil structure, the cut-off head diaphragm and the second layer of the battery cell are adsorbed and sticky, resulting in an increase in the thickness of the battery cell in this area, reducing the capacity density of the battery cell, and affecting the consistency of the battery cell thickness.
A battery-cell reel structure is designed, by providing a first chamfer and a second chamfer on the first and second chamfers on the first and second chamfers, the cut head diaphragm can be adhered to these chamfers, thereby avoiding sticking and adsorption with the second layer of the diaphragm of the battery.
It effectively avoids the problem of excessive local thickness of the battery cell, and improves the consistency of the thickness and energy density of the battery cell.
Smart Images
Figure CN222601033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, to a battery core winding needle structure. Background Art
[0002] In the prior art battery cell winding needle structure, the movable winding needle body and the fixed winding needle body are at right angles. When the diaphragm is inserted into the winding needle and rotated 360°, the cut head diaphragm and the second layer diaphragm of the battery cell are adsorbed and adhered. After the battery cell is pressure-formed, the thickness of the battery cell in this area increases, which reduces the battery cell capacity density and affects the consistency of the battery cell thickness. Utility Model Content
[0003] One purpose of the utility model is to provide a new technical solution for a battery cell winding needle structure, which can at least solve the problem in the prior art that the thickness of the battery cell in this area increases due to the adsorption and adhesion between the cut head diaphragm and the second layer diaphragm of the battery cell.
[0004] The utility model provides a battery core winding needle structure, comprising: a first winding needle body; a second winding needle body, the second winding needle body is movable relative to the first winding needle body, at least one side of the first winding needle body close to the second winding needle body is provided with a first chamfer, and at least one side of the second winding needle body close to the first winding needle body is provided with a second chamfer; a first diaphragm clamp, the first diaphragm clamp is arranged in the first winding needle body, and a part of the first diaphragm clamp extends out of the first winding needle body; a second diaphragm clamp, the second diaphragm clamp is arranged in the second winding needle body, and a part of the second diaphragm clamp extends out of the second winding needle body; the second diaphragm clamp is arranged opposite to the first diaphragm clamp, and the second diaphragm clamp is movable relative to the first diaphragm clamp; a head diaphragm, the head diaphragm is located between the first diaphragm clamp and the second diaphragm clamp, and after the winding needle is pulled out, a part of the head diaphragm is attached to the first chamfer or the second chamfer.
[0005] Optionally, the first chamfers are respectively provided on two opposite sides of the first winding needle body, and the first diaphragm clamping strip is provided between the two first chamfers.
[0006] Optionally, the second chamfers are respectively provided on two opposite sides of the second needle winding body, and the second diaphragm clamping strip is provided between the two second chamfers.
[0007] Optionally, the first chamfer extends along the outer wall surface of the first winding needle body in the length direction of the first diaphragm clamping strip, and the second chamfer extends along the outer wall surface of the second winding needle body in the length direction of the second diaphragm clamping strip.
[0008] Optionally, the first chamfer extends to a second diaphragm layer of the first needle winding body, and the second chamfer extends to a second diaphragm layer of the second needle winding body.
[0009] Optionally, the first chamfer and the second chamfer are arc-shaped chamfers respectively.
[0010] Optionally, the interval between the first diaphragm clamping strip and the second diaphragm clamping strip is 0.5-1.5 mm.
[0011] Optionally, a recess is provided at one end of the first diaphragm clamp, and a matching portion is provided at one end of the second diaphragm clamp, the recess is arranged opposite to the matching portion, and the recess and the matching portion can be correspondingly snap-fitted.
[0012] Optionally, the recessed portion is formed as a groove, and the matching portion forms a recessed hole corresponding to the groove.
[0013] Optionally, the groove is an M-shaped groove, a Z-shaped groove or a C-shaped groove.
[0014] The battery cell winding needle structure of the utility model ensures that the cut head diaphragm can be attached to the first chamfer or the second chamfer by respectively setting the first and second chamfers on the first and second winding needle bodies, thereby avoiding the head diaphragm and the second layer of diaphragm of the battery cell from sticking and adsorbing. After the winding needle is pulled out, the head diaphragm will be flattened and spread out to form a straight line, reducing the problem of excessive thickness of the local battery cell and improving the consistency of battery cell thickness and energy density.
[0015] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings, which are incorporated in 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.
[0017] Figure 1 is a top view of the battery core winding needle structure according to an embodiment of the utility model;
[0018] Figure 2 is a side view of a battery core winding needle structure according to an embodiment of the utility model;
[0019] Figure 3 This is a front view of the battery core winding needle structure assembly according to an embodiment of the utility model;
[0020] Figure 4 is a schematic diagram of the winding of the head diaphragm according to an embodiment of the utility model;
[0021] Figure 5 is another schematic diagram of the head diaphragm winding according to an embodiment of the utility model;
[0022] Figure 6 It is a schematic diagram of the state of the head diaphragm of the battery core winding needle structure after the needle is pulled out according to an embodiment of the utility model.
[0023] Reference numerals:
[0024] First needle winding body 10; first chamfer 11;
[0025] Second needle winding body 20; second chamfer 21;
[0026] first diaphragm clip strip 30; recess 31;
[0027] The second diaphragm clamping strip 40; the matching portion 41;
[0028] Head diaphragm 50;
[0029] The second diaphragm 60 . DETAILED DESCRIPTION
[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.
[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.
[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0033] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0035] In the specification and claims of the utility model, if the term "first" or "second" is involved, it may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the related objects are in an "or" relationship.
[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" involved should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0038] The following is a detailed description of the battery cell winding needle structure according to an embodiment of the utility model in conjunction with the accompanying drawings.
[0039] like Figures 1 to 3 As shown, the battery cell winding needle structure according to the embodiment of the utility model includes a first winding needle body 10 , a second winding needle body 20 , a first diaphragm clamping strip 30 , a second diaphragm clamping strip 40 and a head diaphragm 50 .
[0040] Specifically, the second needle winding body 20 is movable relative to the first needle winding body 10, and at least one side of the first needle winding body 10 close to the second needle winding body 20 is provided with a first chamfer 11, and at least one side of the second needle winding body 20 close to the first needle winding body 10 is provided with a second chamfer 21. The first diaphragm clamp 30 is arranged in the first needle winding body 10, and a part of the first diaphragm clamp 30 extends out of the first needle winding body 10. The second diaphragm clamp 40 is arranged in the second needle winding body 20, and a part of the second diaphragm clamp 40 extends out of the second needle winding body 20; the second diaphragm clamp 40 is arranged opposite to the first diaphragm clamp 30, and the second diaphragm clamp 40 is movable relative to the first diaphragm clamp 30. The head diaphragm 50 is located between the first diaphragm clamp 30 and the second diaphragm clamp 40, and after the needle winding is pulled out, a part of the head diaphragm 50 is attached to the first chamfer 11 or the second chamfer 21.
[0041] In other words, the battery winding needle structure according to the embodiment of the utility model is mainly used in the polymer battery winding process. Figures 1 to 3 As shown, the battery core winding needle structure of the utility model is mainly composed of a first winding needle body 10, a second winding needle body 20, a first diaphragm clamping strip 30, a second diaphragm clamping strip 40 and a head diaphragm 50. Figure 3 The second needle winding body 20 is movable relative to the first needle winding body 10. The first needle winding body 10 is a fixed needle winding body, and the second needle winding body 20 is a movable needle winding body. The first needle winding body 10 and the second needle winding body 20 can be arranged horizontally symmetrically. The first needle winding body 10 is provided with a first chamfer 11 on at least one side close to the second needle winding body 20, and the second needle winding body 20 is provided with a second chamfer 21 on at least one side close to the first needle winding body 10.
[0042] like Figure 3 As shown, the first diaphragm clamp 30 can be installed in the first needle winding body 10, and a portion of the first diaphragm clamp 30 extends out of the first needle winding body 10. The second diaphragm clamp 40 is installed in the second needle winding body 20, and a portion of the second diaphragm clamp 40 extends out of the second needle winding body 20. The second diaphragm clamp 40 is arranged opposite to the first diaphragm clamp 30, the first diaphragm clamp 30 is a fixed diaphragm clamp, and the second diaphragm clamp 40 is movable relative to the first diaphragm clamp 30.
[0043] In actual operation, the base drive device can drive the second diaphragm clamp 40 (movable diaphragm clamp) to move toward the first winding needle body 10 (fixed winding needle body). The base drive device can drive the second winding needle body 20 (movable winding needle body) to move away from the first winding needle body 10 (fixed winding needle body). The head diaphragm 50 is located between the first diaphragm clamp 30 and the second diaphragm clamp 40. Figures 4 to 6 As shown, after the needle is rolled and removed, a portion of the head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21 (as shown in FIG. Figure 4 and Figure 5 As shown), the head diaphragm 50 does not contact the second diaphragm 60 of the battery cell, and the head diaphragm 50 is prevented from adsorbing and sticking to the second diaphragm 60 of the battery cell. The head diaphragm 50 will be spread out to form a straight line (see Figure 6 ), reduce the problem of excessive thickness of the local battery cell, and improve the consistency of battery cell thickness and energy density.
[0044] Therefore, according to the battery winding needle structure of the embodiment of the utility model, by respectively setting the first chamfer 11 and the second chamfer 21 on the first winding needle body 10 and the second winding needle body 20, it is ensured that the cut head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21, thereby avoiding the head diaphragm 50 and the second layer diaphragm 60 of the battery cell from sticking and adsorbing. After the winding needle is pulled out, the head diaphragm 50 will be flattened and spread out to form a straight line, reducing the problem of excessive thickness of the local battery cell and improving the consistency of battery cell thickness and energy density.
[0045] According to an embodiment of the present invention, first chamfers 11 are respectively provided on two opposite sides of the first needle winding body 10 , and the first diaphragm clamping strip 30 is provided between the two first chamfers 11 .
[0046] That is to say, Figures 1 to 3 As shown, first chamfers 11 may be respectively provided on two opposite sides of the first needle winding body 10 , and the first diaphragm clamping strip 30 is provided between the two first chamfers 11 , thereby improving the application range of the first needle winding body 10 .
[0047] According to an embodiment of the present invention, second chamfers 21 are respectively provided on two opposite sides of the second needle winding body 20 , and the second diaphragm clamping strip 40 is provided between the two second chamfers 21 .
[0048] In other words, see Figures 1 to 3 , the second winding needle body 20 can be provided with second chamfers 21 on opposite sides, and the second diaphragm clamp 40 is provided between the two second chamfers 21, thereby improving the application range of the first winding needle body 10. By correspondingly providing the first chamfer 11 and the second chamfer 21 on opposite sides of the first winding needle body 10 and the second winding needle body 20, the head diaphragm 50 and the second diaphragm 60 of the battery cell can be effectively prevented from sticking and adsorbing. Figures 4 to 6 As shown, after the needle is rolled and pulled out, the head diaphragm 50 will be flattened and spread out to form a straight line, thereby reducing the problem of excessive thickness of the local battery cell and improving the consistency of the battery cell thickness and energy density.
[0049] In some specific embodiments of the present invention, the first chamfer 11 extends along the outer wall of the first needle winding body 10 in the length direction of the first diaphragm clamp 30, and the second chamfer 21 extends along the outer wall of the second needle winding body 20 in the length direction of the second diaphragm clamp 40.
[0050] That is, see Figure 3 , the first chamfer 11 can extend along the outer wall surface of the first winding needle body 10 in the length direction of the first diaphragm clamp 30. The second chamfer 21 can extend along the outer wall surface of the second winding needle body 20 in the length direction of the second diaphragm clamp 40. The base drive device can drive the second diaphragm clamp 40 (movable diaphragm clamp) to move toward the first winding needle body 10 (fixed winding needle body). The base drive device can drive the second winding needle body 20 (movable winding needle body) to move away from the first winding needle body 10 (fixed winding needle body). The head diaphragm 50 is located between the first diaphragm clamp 30 and the second diaphragm clamp 40. After the winding needle is pulled out, as Figure 4 and Figure 5 As shown, a portion of the head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21, so as not to contact the second layer diaphragm 60 of the battery cell, thereby preventing the head diaphragm 50 from being adsorbed and adhered to the second layer diaphragm 60 of the battery cell. Figure 6 As shown, the head diaphragm 50 will be spread out flat to form a straight line, thereby reducing the problem of excessive thickness of the battery cell locally and improving the thickness consistency and energy density of the battery cell.
[0051] According to an embodiment of the present invention, the first chamfer 11 extends to the second diaphragm 60 of the first needle winding body 10 , and the second chamfer 21 extends to the second diaphragm 60 of the second needle winding body 20 .
[0052] That is, see Figure 3 The first chamfer 11 can extend to the second diaphragm 60 of the first needle winding body 10, and the second chamfer 21 can extend to the second diaphragm 60 of the second needle winding body 20. After the diaphragm cutter cuts off the head diaphragm 50, the length of the excess head diaphragm 50 is less than the extension length of the first chamfer 11 or the second chamfer 21. Figure 4 and Figure 5 As shown, after the needle is rolled and pulled out, a portion of the head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21, so as not to contact the second layer diaphragm 60 of the battery cell, thereby preventing the head diaphragm 50 from being adsorbed and adhered to the second layer diaphragm 60 of the battery cell, and the head diaphragm 50 will be spread out to form a straight line (see Figure 6 ), reduce the problem of excessive thickness of the local battery cell, and improve the consistency of battery cell thickness and energy density.
[0053] According to an embodiment of the present invention, the first chamfer 11 and the second chamfer 21 are arc-shaped chamfers. Figure 3As shown, the first chamfer 11 and the second chamfer 21 can be set to arc-shaped R angles respectively. After the needle is rolled and pulled out, a part of the head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21, so as not to contact the second layer diaphragm 60 of the battery cell, thereby avoiding the head diaphragm 50 and the second layer diaphragm 60 of the battery cell from being adsorbed and adhered. The head diaphragm 50 will be flattened and spread out to form a straight line, thereby reducing the problem of excessive local thickness of the battery cell and improving the thickness consistency and energy density of the battery cell.
[0054] According to one embodiment of the present invention, see Figures 1 to 3 The interval between the first diaphragm clamp 30 and the second diaphragm clamp 40 can be set to 0.5-1.5 mm, so that after the first diaphragm clamp 30 and the second diaphragm clamp 40 clamp the head diaphragm 50, the head diaphragm 50 can be cut off by the diaphragm cutter.
[0055] In some specific embodiments of the present invention, a concave portion 31 is provided at one end of the first diaphragm clamp 30, and a matching portion 41 is provided at one end of the second diaphragm clamp 40. The concave portion 31 and the matching portion 41 are arranged opposite to each other, and the concave portion 31 and the matching portion 41 can be correspondingly engaged. The concave portion 31 is formed as a groove, and the matching portion 41 forms a concave hole corresponding to the groove. The groove is an M-shaped groove, a Z-shaped groove, or a C-shaped groove.
[0056] That is to say, Figure 3 As shown, a recess 31 is provided at one end of the first diaphragm clamp 30, and a mating portion 41 is provided at one end of the second diaphragm clamp 40. The first diaphragm clamp 30 can be embedded in the first winding needle body 10 through a spring sheet. The recess 31 and the mating portion 41 are arranged relative to each other, and the recess 31 and the mating portion 41 can be matched and clamped to clamp the head diaphragm 50. The recess 31 can be set as a groove, and the mating portion 41 can be set as a concave hole corresponding to the groove. The groove can be an M-shaped groove, a Z-shaped groove, a C-shaped groove or other folded grooves. The present utility model does not limit the specific shape of the groove. As long as the design can meet the process requirements of the battery winding needle structure, it should fall within the protection scope of the present utility model.
[0057] In the present utility model, if Figure 3 As shown, the surface of the movable winding needle body (second winding needle body 20) and the surface area of the fixed winding needle body (first winding needle body 10) are respectively provided with arc R angles (first chamfer 11 and second chamfer 21) tangent to their surfaces. The fixed winding needle body and the movable winding needle body are arranged horizontally symmetrically, and the serrations (recess 31) of the fixed diaphragm clamp (first diaphragm clamp 30) and the "mountain" serrations (matching portion 41) of the movable diaphragm clamp (second diaphragm clamp 40) are matched. By using the spring sheet embedded in the groove of the fixed winding needle body, the distance between the fixed diaphragm clamp and the movable diaphragm clamp is 0.5-1.5mm. The diaphragm cutter is arranged on the lower side of the winding needle body.
[0058] like Figures 1 to 6 As shown, the cell winding process and working principle of the cell winding needle structure of the utility model are as follows:
[0059] First, the gap between the winding needle diaphragm clamps (the first diaphragm clamps 30 and the second diaphragm clamps 40) passes through the isolation membrane (the head diaphragm 50). Then, the base drive device drives the movable diaphragm clamp (the second isolation clamp) to move toward the fixed winding needle body (the first winding needle body 10), and the base drive device drives the movable winding needle body (the second winding needle body 20) to move away from the fixed winding needle body. Next, the winding needle locking mechanism engages, and the fixed and movable diaphragm clamps (the first diaphragm clamps 30 and the second diaphragm clamps 40) clamp the head diaphragm 50. The diaphragm cutter cuts off the head diaphragm 50, the winding needle rotates counterclockwise, and the positive and negative plates are respectively inserted.
[0060] When the winding needle rotates counterclockwise to 360°, the cut-off part of the head diaphragm 50 is 100% completely inverted into the arc R angle (first chamfer 11) area of the fixed winding needle body by the diaphragm clamp serrated shape (recess 31 and matching part 41) and pressure, thereby contacting the second diaphragm 60 of the battery cell to avoid adsorption and adhesion between the head diaphragm 50 and the second diaphragm 60. Then, the winding needle continues to rotate, the finishing glue is applied, and the winding needle locking mechanism is opened. The base drive device drives the movable winding needle body to move toward the fixed winding needle body, and the base drive device drives the movable diaphragm clamp strip to move away from the fixed winding needle body. Since the two inner layers of diaphragms are not adsorbed and adhered, when the winding needle is pulled out, the inner head diaphragm 50 is flattened and laid flat, and the core removal clamp takes the battery cell. Finally, the battery cell is pressure-formed.
[0061] In summary, according to the battery winding needle structure of the embodiment of the utility model, by respectively setting the first chamfer 11 and the second chamfer 21 on the first winding needle body 10 and the second winding needle body 20, it is ensured that the cut head diaphragm 50 can be attached to the first chamfer 11 or the second chamfer 21, thereby avoiding the head diaphragm 50 and the second layer diaphragm 60 of the battery cell from sticking and adsorbing. After the winding needle is pulled out, the head diaphragm 50 will be flattened and spread out to form a straight line, reducing the problem of excessive thickness of the local battery cell and improving the consistency of battery cell thickness and energy density.
[0062] Of course, for those skilled in the art, other structures of the battery cell winding needle structure and its working principles are understandable and achievable, and will not be described in detail in the present utility model.
[0063] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. A battery core winding needle structure, characterized in that: include: A first winding needle body (10); a second needle winding body (20), the second needle winding body (20) being movable relative to the first needle winding body (10), the first needle winding body (10) being provided with a first chamfer (11) on at least one side close to the second needle winding body (20), and the second needle winding body (20) being provided with a second chamfer (21) on at least one side close to the first needle winding body (10); A first diaphragm clamping strip (30), wherein the first diaphragm clamping strip (30) is arranged in the first needle winding body (10), and a portion of the first diaphragm clamping strip (30) extends out of the first needle winding body (10); a second diaphragm clamp (40), the second diaphragm clamp (40) being arranged in the second needle winding body (20), and a portion of the second diaphragm clamp (40) extending out of the second needle winding body (20); the second diaphragm clamp (40) being arranged opposite to the first diaphragm clamp (30), and the second diaphragm clamp (40) being movable relative to the first diaphragm clamp (30); A head diaphragm (50), the head diaphragm (50) is located between the first diaphragm clamp (30) and the second diaphragm clamp (40), and after the needle is rolled and pulled out, a portion of the head diaphragm (50) is attached to the first chamfer (11) or the second chamfer (21).
2. The battery core winding needle structure according to claim 1, characterized in that: The first chamfers (11) are respectively arranged on opposite sides of the first needle winding body (10), and the first diaphragm clamping strip (30) is arranged between the two first chamfers (11).
3. The battery core winding needle structure according to claim 2, characterized in that: The second chamfers (21) are respectively provided on opposite sides of the second needle winding body (20), and the second diaphragm clamping strip (40) is provided between the two second chamfers (21).
4. The battery core winding needle structure according to claim 1, characterized in that: The first chamfer (11) extends along the outer wall surface of the first needle winding body (10) in the length direction of the first diaphragm clamp (30), and the second chamfer (21) extends along the outer wall surface of the second needle winding body (20) in the length direction of the second diaphragm clamp (40).
5. The battery core winding needle structure according to claim 4, characterized in that: The first chamfer (11) extends to the second diaphragm (60) of the first needle winding body (10), and the second chamfer (21) extends to the second diaphragm (60) of the second needle winding body (20).
6. The battery core winding needle structure according to claim 1, characterized in that: The first chamfer (11) and the second chamfer (21) are respectively arc-shaped chamfers.
7. The battery core winding needle structure according to claim 1, characterized in that: The interval between the first diaphragm clamping strip (30) and the second diaphragm clamping strip (40) is 0.5-1.5 mm.
8. The battery core winding needle structure according to claim 1, characterized in that: One end of the first diaphragm clamp (30) is provided with a recessed portion (31), and one end of the second diaphragm clamp (40) is provided with a matching portion (41); the recessed portion (31) and the matching portion (41) are arranged opposite to each other, and the recessed portion (31) and the matching portion (41) can be correspondingly engaged.
9. The battery core winding needle structure according to claim 8, characterized in that: The recessed portion (31) is formed as a groove, and the matching portion (41) is formed as a recessed hole corresponding to the groove.
10. The battery core winding needle structure according to claim 9, characterized in that: The groove is an M-shaped groove, a Z-shaped groove or a C-shaped groove.