Battery cell winding needle structure

Abstract

The utility model discloses a battery cell winding needle structure which comprises a fixed needle and a movable needle, and the width of the fixed needle is larger than that of the movable needle. The fixed needle has enough space for mounting and fixing the inner clamping needle under the condition of small size, and the size of the movable needle is reduced by surplus width so as to meet the moving space of the movable inner clamping needle, so that the sizes of the two winding needles are matched to normally clamp a diaphragm for winding, the production of a small-width naked battery cell is met, and the winding effect is good. Besides, due to the change of the winding needle structure, the winding needle seat and the winding mechanism in the winding equipment can be kept unchanged, so that the risk of variation of the winding equipment is reduced, and the width stability during production of the small-width naked battery cell is facilitated. Therefore, the winding needle disclosed by the utility model solves the problem that the inner perimeter of a battery cell wound by the existing winding needle is larger, can wind a small-size naked battery cell, and improves the energy density of the battery cell.

Description

Technical Field

[0001] The utility model mainly relates to a battery core winding needle structure. Background Art

[0002] The winding needle is a device used for winding lithium battery cells. Its main structure includes a fixed needle and a movable needle. The fixed needle and the movable needle are both equipped with an internal clamping needle. After the internal clamping needle clamps the structure of the battery cell such as the pole piece and diaphragm, the winding needle can be driven to rotate by the equipment to achieve the operation of winding the battery cell.

[0003] The winding needle is a long strip structure. When winding, the movable needle rotates around an axis parallel to the length direction of the fixed needle and the movable needle. The pole piece, diaphragm, etc. are gradually wrapped around the outside of the winding needle, so that the inner circumference of the battery cell is affected by the width of the winding needle. The design width of the fixed needle and the movable needle of the existing winding needle is the same, which leads to a larger inner circumference of the wound battery cell, which is not conducive to improving the energy density of the battery cell.

[0004] In view of this, it is necessary to improve the existing needle winding structure. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a battery core winding needle structure to solve the problem that the inner circumference of the battery core wound by the existing winding needle is relatively large.

[0006] The utility model discloses a battery core winding needle structure, which comprises a fixed needle and a movable needle, wherein the width of the fixed needle is greater than the width of the movable needle.

[0007] Preferably, the width of the fixed needle is D1, the width of the movable needle is D2, and D1 = D2 + 1 mm.

[0008] Preferably, the fixed needle and the movable needle are both provided with clamping surfaces facing each other, the width of the fixed needle is the size of the fixed needle in a direction perpendicular to the clamping surfaces, and the width of the movable needle is the size of the movable needle in a direction perpendicular to the clamping surfaces.

[0009] Preferably, a fixed groove is formed on the fixed needle, and a fixed inner clamping needle is installed in the fixed groove; and a movable groove is formed on the movable needle, and a movable inner clamping needle is installed in the movable groove.

[0010] Preferably, the fixed needle and the movable needle are both in the shape of long strips, and rotate around a winding axis parallel to the length direction of the two.

[0011] Preferably, taking the plane perpendicular to the winding axis as the section, the inner circumference of the figure after the fixed needle and the movable needle are cut is 41.46 mm.

[0012] Preferably, the width D1 of the fixing needle is 8.09 mm.

[0013] Preferably, the width D2 of the movable needle is 7.59 mm.

[0014] Preferably, the thickness H1 of the fixed inner clamp needle is 6 mm.

[0015] Preferably, the thickness H2 of the movable inner clamping needle is 4.5 mm.

[0016] The beneficial effect of the utility model is that the width of the fixed needle is greater than the width of the movable needle, and the fixed needle has enough space to install the fixed inner clamping needle in the case of small size, and the size of the movable needle has a surplus width to reduce to meet the activity space of the movable inner clamping needle, so that the size of the two winding needles is matched with the normal clamping diaphragm winding, which meets the production of small-width bare cells and has a good winding effect. In addition, due to the change of the winding needle structure, the winding needle seat and the winding mechanism in the winding equipment can remain unchanged, reducing the risk of variation of the winding equipment, which is conducive to the width stability during the production of small-width bare cells.

[0017] Therefore, the utility model solves the problem of a larger inner circumference of a battery cell wound by an existing needle winding method, and can wind a small-sized bare battery cell, thereby improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is an exploded view of the utility model, from a first perspective;

[0020] Figure 2 This is an exploded view of the utility model, second viewing angle;

[0021] Figure 3 This is an exploded view of the utility model, and the sight line direction is parallel to the winding axis;

[0022] Figure 4 It is a schematic diagram of the overall structure of the utility model, and the cut surface and the inner perimeter of the cut figure are shown with dotted lines.

[0023] Explanation of the reference numerals: 1. fixed needle; 11. fixed groove; 2. fixed inner clamping needle; 3. movable needle; 31. movable groove; 4. movable inner clamping needle; 5. winding shaft; 6. clamping surface. DETAILED DESCRIPTION

[0024] The following will disclose multiple embodiments of the present invention with diagrams. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagram, some conventional structures and parts will be depicted in a simple schematic manner in the diagram.

[0025] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish between parts or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0028] Reference Figure 1-4 , is a battery cell winding needle structure disclosed in the utility model, comprising a fixed needle 1, a fixed inner clamping needle 2, a movable needle 3 and a movable inner clamping needle 4, wherein the fixed needle 1 and the movable needle 3 are both long strip structures, and the fixed needle 1 and the movable needle 3 are both provided with clamping surfaces 6 facing each other, and the two clamping surfaces 6 are planes parallel to each other. When the fixed needle 1 and the movable needle 3 rotate, the winding axis 5 is located between the two clamping surfaces 6 and parallel to the two clamping surfaces 6, and the winding axis 5 is parallel to the length direction of the fixed needle 1 and the movable needle 3, and a fixed groove 11 is provided on the clamping surface 6 of the fixed needle 1, and the fixed groove 11 is a long strip groove and extends along the length direction of the fixed needle 1, and a movable groove 31 is provided on the clamping surface 6 of the movable needle 3, and the movable groove 31 is a long strip groove and extends along the length direction of the movable needle 3.

[0029] Reference Figure 1-4The fixed inner clamping needle 2 is in the shape of a long strip, which is installed in the fixed groove 11 and keeps parallel with the fixed needle 1. The fixed inner clamping needle 2 can move up and down in the fixed groove 11; the movable inner clamping needle 4 is in the shape of a long strip, which is installed in the movable groove 31 and keeps parallel with the movable needle 3. The movable inner clamping needle 4 is fixed on the winding needle seat of the winding equipment. When winding, the fixed inner clamping needle 2 and the movable inner clamping needle 4 clamp the components of the battery cell in a direction parallel to the clamping surface 6.

[0030] Reference Figure 1-4 The width D1 of the fixed needle 1 is the size of the fixed needle 1 in the direction perpendicular to the clamping surface 6, and the width D2 of the movable needle 3 is the size of the movable needle 3 in the direction perpendicular to the clamping surface 6. The width D1 of the fixed needle 1 of the utility model is greater than the width D2 of the movable needle 3. Preferably, D1=D2+1mm. The width of the fixed needle 1 is greater than the width of the movable needle 3, so that the inner circumference of the battery cell after winding can be further reduced, which is suitable for producing bare batteries with smaller widths, thereby further improving the energy density of the battery cell.

[0031] Reference Figure 1-4 , taking the plane perpendicular to the winding axis 5 as the cutting plane, the fixed needle 1 and the movable needle 3 are cut, and the circumference of the cross-sectional figure of the fixed needle 1 and the movable needle 3 obtained after cutting is the inner circumference of the winding needle, and the inner circumference is also the inner circumference of the battery cell obtained after winding. In addition, the dimension of the fixed inner clamping needle 2 in the direction parallel to the clamping surface 6 and perpendicular to the winding axis 5 is the thickness H1 of the fixed inner clamping needle 2, and the dimension of the movable inner clamping needle 4 in the direction parallel to the clamping surface 6 and perpendicular to the winding axis 5 is the thickness H2 of the movable inner clamping needle 4. Preferably, the inner circumference is designed to be 41.46mm, the width D1 of the fixed needle 1 is designed to be 8.09mm, the width D2 of the movable needle 3 is designed to be 7.59mm, the thickness H1 of the fixed inner clamping needle 2 is designed to be 6mm, and the thickness H2 of the movable inner clamping needle 4 is designed to be 4.5mm.

[0032] In the utility model, the width of the fixed needle 1 is greater than the width of the movable needle 3. When the fixed needle 1 is small in size, there is enough space to install the fixed inner clamping needle 2. The size of the movable needle 3 has a surplus width to be reduced to meet the activity space of the movable inner clamping needle 4. Therefore, the sizes of the two winding needles are matched with the normal clamping diaphragm winding, which meets the production of small-width bare cells and has a good winding effect. In addition, due to the change in the winding needle structure, the winding needle seat and the winding mechanism in the winding equipment can remain unchanged, reducing the risk of variation of the winding equipment, which is beneficial to the width stability during the production of small-width bare cells. Therefore, the utility model solves the problem of the larger inner circumference of the cell wound by the existing winding needle, and can wind out small-sized bare cells, thereby improving the energy density of the cell.

[0033] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A battery core winding needle structure, characterized in that: It comprises a fixed needle (1) and a movable needle (3), wherein the width of the fixed needle (1) is greater than the width of the movable needle (3).

2. The battery core winding needle structure according to claim 1, characterized in that: The width of the fixed needle (1) is D1, and the width of the movable needle (3) is D2, where D1 = D2 + 1 mm.

3. The battery core winding needle structure according to claim 1, characterized in that: The fixed needle (1) and the movable needle (3) are both provided with clamping surfaces (6) facing each other; the width of the fixed needle (1) is the size of the fixed needle (1) in a direction perpendicular to the clamping surface (6); the width of the movable needle (3) is the size of the movable needle (3) in a direction perpendicular to the clamping surface (6).

4. The battery core winding needle structure according to claim 1, characterized in that: The fixed needle (1) is provided with a fixed groove (11), and a fixed inner clamping needle (2) is installed in the fixed groove (11); the movable needle (3) is provided with a movable groove (31), and a movable inner clamping needle (4) is installed in the movable groove (31).

5. The battery core winding needle structure according to claim 4, characterized in that: The fixed needle (1) and the movable needle (3) are both in the shape of long strips and rotate around a winding axis (5) parallel to the length direction of the two.

6. The battery core winding needle structure according to claim 5, characterized in that: Taking the plane perpendicular to the winding axis (5) as the section, the inner circumference of the figure after the fixed needle (1) and the movable needle (3) are cut is 41.46 mm.

7. The battery core winding needle structure according to claim 6, characterized in that: The width D1 of the fixing needle (1) is 8.09 mm.

8. The battery core winding needle structure according to claim 6, characterized in that: The width D2 of the movable needle (3) is 7.59 mm.

9. The battery core winding needle structure according to claim 6, characterized in that: The thickness H1 of the fixed inner clamping needle (2) is 6 mm.

10. The battery core winding needle structure according to claim 6, characterized in that: The thickness H2 of the movable inner clamping needle (4) is 4.5 mm.

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