Winding needle of cylindrical battery

Abstract

The utility model relates to the technical field of cylindrical battery winding, and provides a winding needle of a cylindrical battery, which comprises an upper winding needle, a lower winding needle and a ball, the shape of the upper winding needle is matched with that of the lower winding needle, the upper winding needle and the lower winding needle are both semicircular winding needles, and the upper winding needle and the lower winding needle are mutually combined to form a circle. The clamp is used for clamping a battery cell; a plurality of balls are respectively arranged on the arc-shaped side walls of the upper winding needle and the lower winding needle in a rolling manner, and the end parts of the balls protrude out of the upper winding needle or the lower winding needle. The plurality of balls are rotationally arranged on the cambered surface walls of the upper winding needle and the lower winding needle, so that the balls can replace the cambered surface walls of the upper winding needle and the lower winding needle to be in contact with a battery cell after the battery cell is wound by the upper winding needle and the lower winding needle; the upper winding needle and the lower winding needle can be conveniently drawn out through the rolling action of the balls, so that the friction force during drawing is reduced, and the use is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the winding technology field of cylindrical battery, especially a winding needle of cylindrical battery. BACKGROUND

[0002] The winding technology of cylindrical battery cell is an important process in the manufacture of lithium ion batteries, and is widely used in electric vehicles, portable electronic devices and other fields. The existing cylindrical battery cell winding machine basically adopts two half-cylindrical winding needles. When winding, the separator passes through the gap between the two half-cylinders and is clamped, and the two half-cylindrical winding needles are combined into one whole to drive the separator and the pole piece to wind together. When the diameter of the battery cell reaches the target requirement, the two half-cylindrical winding needles are pulled out from the center of the battery cell in turn, and the cylindrical battery cell completes the winding step

[0003] The utility model with publication number CN220341280U proposes a battery cell winding needle and winding device. The battery cell winding needle includes a main needle and an auxiliary needle. The main needle includes a main needle body, and the cross section of the main needle body is circular and integrally formed. The auxiliary needle includes an auxiliary needle body, which is used to clamp the separator together with the main needle body. The auxiliary needle is adapted to rotate synchronously with the main needle to wind the pole group on the main needle body. However, the above-mentioned battery cell winding needle still uses two half-cylindrical winding needles commonly used in the market. After the above-mentioned battery cell winding needle completes the winding of the battery cell, the pole piece and the separator are both wound with tension. The friction between the winding needle and the separator is large due to the internal extrusion force on the winding needle. This will cause difficulty in pulling out the needle, which can easily cause the problem of poor core extraction of the separator and the pole piece in the center of the winding core. Therefore, the present scheme proposes a winding needle for cylindrical battery to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a winding needle for cylindrical battery. A plurality of balls are rotatably arranged on the arc surface walls of the upper winding needle and the lower winding needle. After the battery cell is wound by the upper winding needle and the lower winding needle, the balls can replace the arc surface walls of the upper winding needle and the lower winding needle to contact the battery cell. When the upper winding needle and the lower winding needle are pulled out, the upper winding needle and the lower winding needle can be conveniently pulled out by the rolling action of the balls, reducing the friction force when pulled out, and facilitating use.

[0005] The technical scheme of the utility model is as follows: The utility model provides a winding needle for cylindrical battery, which comprises an upper winding needle, a lower winding needle and balls, wherein,

[0006] The upper winding needle and the lower winding needle are adapted in shape, the upper winding needle and the lower winding needle are both half-cylindrical winding needles, and the upper winding needle and the lower winding needle are combined into a circle to clamp the battery cell;

[0007] A plurality of rolling balls are respectively arranged on the arc-shaped side walls of the upper winding needle and the lower winding needle, and the ends of the rolling balls protrude from the upper winding needle or the lower winding needle.

[0008] On the basis of the above technical scheme, preferably, the plurality of rolling balls are combined into a plurality of rolling ball groups, the rolling ball group comprises a plurality of rolling balls, and the plurality of rolling ball groups are equidistantly distributed in the extension direction of the upper winding needle and the lower winding needle.

[0009] On the basis of the above technical scheme, preferably, the plurality of rolling balls of the rolling ball group are equidistantly distributed in the extension direction of the upper winding needle and the lower winding needle.

[0010] On the basis of the above technical scheme, preferably, the plurality of rolling ball groups are circumferentially equidistantly distributed along the arc surface walls of the upper winding needle and the lower winding needle.

[0011] On the basis of the above technical scheme, preferably, the radius of the rolling ball is R, and 0.1mm≤R≤0.5mm.

[0012] On the basis of the above technical scheme, preferably, a plurality of limiting grooves are arranged on the arc surface walls of the upper winding needle and the lower winding needle, the rolling ball is located in the limiting groove, and the limiting groove is used for limiting the rolling ball from being separated from the upper winding needle or the lower winding needle.

[0013] On the basis of the above technical scheme, preferably, the end wall of the upper winding needle is inclined from the end of the upper winding needle to the direction of the plane wall of the upper winding needle.

[0014] On the basis of the above technical scheme, preferably, the first winding needle rod and the second winding needle rod are further included, wherein,

[0015] The first winding needle rod is arranged at one end of the upper winding needle, and the second winding needle rod is arranged at one end of the lower winding needle, and the first winding needle rod and the second winding needle rod are both provided with fixed bolt holes in communication with each other.

[0016] On the basis of the above technical scheme, preferably, the first winding needle rod and the second winding needle rod are both semicircular rods, the first winding needle rod and the second winding needle rod are combined into a circle, the size of the first winding needle rod is larger than the size of the upper winding needle, and the size of the second winding needle rod is larger than the size of the lower winding needle.

[0017] On the basis of the above technical scheme, preferably, the surfaces of the upper winding needle and the lower winding needle are both plated with a chromium plating layer.

[0018] The winding needle of the cylindrical battery has the following beneficial effects relative to the prior art:

[0019] (1) by rotating the arc wall of the upper winding needle and the lower winding needle, a plurality of balls are arranged on the arc wall of the upper winding needle and the lower winding needle, so that the balls can replace the arc wall of the upper winding needle and the lower winding needle to contact the battery after the battery is wound by the upper winding needle and the lower winding needle, so that the upper winding needle and the lower winding needle can be conveniently pulled out by the rolling action of the balls when the upper winding needle and the lower winding needle are pulled out, reducing the friction when pulled out, and facilitating use.

[0020] (2) by setting the end wall of the upper winding needle and the lower winding needle as an inclined wall, the inclined end wall of the upper winding needle and the lower winding needle can guide and clamp the winding core when the winding core is clamped by the upper winding needle and the lower winding needle, facilitating clamping of the winding core. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 It is a right side view of the winding needle of the cylindrical battery of the present application.

[0023] Figure 2 It is a left side view of the winding needle of the cylindrical battery of the present application.

[0024] Figure 3 It is a perspective view of the winding needle of the cylindrical battery of the present application. Figure 2 It is an enlarged view of A shown in the drawing.

[0025] Figure 4 It is a front view of the winding needle of the cylindrical battery of the present application.

[0026] Figure 5 It is a perspective view of the winding needle of the cylindrical battery of the present application. Figure 4 It is a sectional view of the structure at B-B shown in the drawing.

[0027] Figure 6 It is a structure schematic view of the lower winding needle of the winding needle of the cylindrical battery of the present application.

[0028] In the drawing: 11, upper winding needle; 12, lower winding needle; 13, limiting groove; 21, first winding needle rod; 22, second winding needle rod; 23, fixing bolt hole; 3, ball; 31, ball set. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0030] As shown in Figures 1-6 The winding needle of the cylindrical battery comprises an upper winding needle 11, a lower winding needle 12 and a plurality of balls 3, wherein the upper winding needle 11 is matched with the shape of the lower winding needle 12, the upper winding needle 11 and the lower winding needle 12 are both semi-circular winding needles, and the upper winding needle 11 and the lower winding needle 12 are combined to be circular for clamping the battery cell; the plurality of balls 3 are respectively arranged at the arc-shaped side walls of the upper winding needle 11 and the lower winding needle 12, and the end portions of the balls 3 protrude from the upper winding needle 11 or the lower winding needle 12.

[0031] In the specific implementation, the planar walls of the upper winding needle 11 and the lower winding needle 12 clamp the battery cell from both sides of the battery cell, and then the upper winding needle 11 is adjusted to rotate together with the lower winding needle 12, so as to complete the winding process of the battery cell. At this time, the arc walls of the upper winding needle 11 and the lower winding needle 12 abut against the battery cell, and after the winding of the battery cell is completed, the upper winding needle 11 and the lower winding needle 12 are pulled out together. Since the arc walls of the upper winding needle 11 and the lower winding needle 12 are both provided with a plurality of balls 3, after the battery cell is wound by the upper winding needle 11 and the lower winding needle 12, the balls 3 replace the arc walls of the upper winding needle 11 and the lower winding needle 12 to contact the battery cell. In this way, when the upper winding needle 11 and the lower winding needle 12 are pulled out, the upper winding needle 11 and the lower winding needle 12 can be conveniently pulled out by the rolling action of the balls 3, the frictional force during pulling out is reduced, and the use is facilitated.

[0032] As a preferred embodiment, the plurality of balls 3 are combined into a plurality of ball groups 31, the ball group 31 comprises a plurality of balls 3, and the plurality of ball groups 31 are equidistantly distributed in the extension direction of the upper winding needle 11 and the lower winding needle 12.

[0033] The plurality of balls 3 of the ball group 31 are equidistantly distributed in the extension direction of the upper winding needle 11 and the lower winding needle 12.

[0034] The plurality of ball groups 31 are circumferentially equidistantly distributed along the arc walls of the upper winding needle 11 and the lower winding needle 12.

[0035] The radius of the ball 3 is R, and 0.1mm≤R≤0.5mm.

[0036] In the specific implementation, the radius of the upper winding needle 11 and the lower winding needle 12 is 3mm, and the radius of the ball 3 is set to be between 0.1mm and 0.5mm, so that a plurality of balls 3 can be distributed on the upper winding needle 11 and the lower winding needle 12.

[0037] In specific implementation, the circumferential wall of the combination of the upper winding needle 11 and the lower winding needle 12 is circumferentially distributed with six ball groups 31 that are equidistantly distributed. And the balls 3 of each ball group 31 are only equidistantly distributed in the extension direction of the upper winding needle 11 and the lower winding needle 12.

[0038] As a preferred implementation, the arc surface wall of the upper winding needle 11 and the lower winding needle 12 is provided with a plurality of limiting grooves 13, and the balls 3 are located inside the limiting grooves 13, and the limiting grooves 13 are used to limit the balls 3 from disengaging from the upper winding needle 11 or the lower winding needle 12.

[0039] In specific implementation, the limiting groove 13 is an open spherical groove, and the rolling connection between the ball 3 and the upper winding needle 11 or the lower winding needle 12 is completed by locating the ball 3 in the limiting groove 13.

[0040] In this way, the balls 3 can rotate freely, so that the upper winding needle 11 and the lower winding needle 12 can be pulled out from any direction, which is convenient to use.

[0041] As a preferred implementation, the end wall of the upper winding needle 11 is inclined from the end of the upper winding needle 11 to the direction of the planar wall of the upper winding needle 11.

[0042] In this way, the end wall of the upper winding needle 11 and the lower winding needle 12 is an inclined wall, so that when the upper winding needle 11 and the lower winding needle 12 clamp the winding core, the inclined end wall of the upper winding needle 11 and the lower winding needle 12 can guide and clamp the winding core, which facilitates clamping the winding core.

[0043] It also includes a first winding needle rod 21 and a second winding needle rod 22, wherein the first winding needle rod 21 is arranged at one end of the upper winding needle 11, and the second winding needle rod 22 is arranged at one end of the lower winding needle 12, and the first winding needle rod 21 and the second winding needle rod 22 are both provided with fixed bolt holes 23 that are in communication with each other.

[0044] As a preferred implementation, the first winding needle rod 21 and the second winding needle rod 22 are both semicircular rods, and the first winding needle rod 21 and the second winding needle rod 22 are combined to be circular, and the size of the first winding needle rod 21 is larger than the size of the upper winding needle 11, and the size of the second winding needle rod 22 is larger than the size of the lower winding needle 12.

[0045] As a preferred implementation, the surface of the upper winding needle 11 and the lower winding needle 12 is plated with a chromium plating layer.

[0046] In this way, the planar wall of the upper winding needle 11 and the lower winding needle 12 is plated with a chromium plating layer that reduces friction, and the friction of the planar wall of the upper winding needle 11 and the lower winding needle 12 is reduced by plating the chromium plating layer, which facilitates the pulling out of the upper winding needle 11 and the lower winding needle 12, and is convenient to use.

[0047] Specifically, after the battery cell is clamped by the upper winding needle 11 and the lower winding needle 12, the first winding needle rod 21 and the second winding needle rod 22 can be connected by bolts passing through the fixing bolt holes 23, so as to complete the combined connection processing of the upper winding needle 11 and the lower winding needle 12.

[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A winding needle for a cylindrical battery, characterized by: Including the upper needle (11), the lower needle (11) and the ball (3), wherein, The upper needle (11) and the lower needle (12) are semicircular needles, and the upper needle (11) and the lower needle (12) are combined into a circle to clamp the battery cell. A plurality of balls (3) are respectively arranged on the arc-shaped side walls of the upper needle (11) and the lower needle (12), and the ends of the balls (3) protrude from the upper needle (11) or the lower needle (12).

2. The winding needle for a cylindrical battery according to claim 1, wherein: A plurality of the balls (3) are combined into a plurality of ball groups (31), the ball group (31) includes a plurality of balls (3), and a plurality of the ball groups (31) are equidistantly distributed in the extension direction of the upper needle (11) and the lower needle (12).

3. The winding needle for a cylindrical battery according to claim 2, wherein: A plurality of the balls (3) of the ball group (31) are equidistantly distributed in the extension direction of the upper needle (11) and the lower needle (12).

4. The winding needle for a cylindrical battery according to claim 2, wherein A plurality of the ball groups (31) are circumferentially equidistantly distributed along the arc surface walls of the upper needle (11) and the lower needle (12).

5. The winding needle for a cylindrical battery according to claim 1, wherein: The radius of the ball (3) is R, and 0.1mm≤R≤0.5mm.

6. The winding needle for a cylindrical battery according to claim 1, wherein: The arc surface walls of the upper needle (11) and the lower needle (12) are provided with a plurality of limiting grooves (13), the ball (3) is located in the limiting groove (13), and the limiting groove (13) is used for limiting the ball (3) from separating from the upper needle (11) or the lower needle (12).

7. The winding needle for a cylindrical battery according to claim 1, wherein: The end wall of the upper needle (11) is inclined from the end of the upper needle (11) to the direction of the plane wall of the upper needle (11).

8. The winding needle for a cylindrical battery according to claim 1, wherein: Further comprising a first needle rod (21) and a second needle rod (22), wherein, The first needle rod (21) is arranged at one end of the upper needle (11), and the second needle rod (22) is arranged at one end of the lower needle (12), and the first needle rod (21) and the second needle rod (22) are provided with fixed bolt holes (23) that are in communication with each other.

9. The winding needle for a cylindrical battery according to claim 8, wherein: The first needle rod (21) and the second needle rod (22) are semicircular rods, and the first needle rod (21) and the second needle rod (22) are combined into a circle, and the size of the first needle rod (21) is larger than the size of the upper needle (11), and the size of the second needle rod (22) is larger than the size of the lower needle (12).

10. The winding needle for a cylindrical battery according to claim 1, wherein: The surfaces of the upper needle (11) and the lower needle (12) are plated with a chromium plating layer.

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