CN213752794U - Electricity core book needle and electricity core winder - Google Patents

Abstract

The application provides needle and electric core winder are rolled up to electric core includes: a handle and a needle winding body; one end of the needle winding body is connected with the end part of the handle; the needle winding body comprises a first needle body and a second needle body which are oppositely arranged, and the first needle body and the second needle body are arranged at intervals; wherein, first needle body is equipped with the bulge towards one side of second needle body, and the second needle body is equipped with the depressed part towards one side of first needle body, and the bulge extends to in the depressed part to have the clearance with the inner wall of depressed part, the clearance is used for supplying the diaphragm to penetrate, and the diaphragm forms electric core after coiling on rolling up the needle body. According to the electric core winding needle and the electric core winding machine, the machining procedure of the electric core can be simplified, and the quality and the yield of the electric core are improved.

Description

Electricity core book needle and electricity core winder

Technical Field

The application relates to the technical field of lithium battery manufacturing, in particular to a battery cell winding needle and a battery cell winding machine.

Background

In the manufacturing process of the lithium battery, the winding of the battery cell is the most critical step, and the use safety and the service life of the lithium battery can be influenced by the winding quality of the battery cell.

At present, a coil is usually adopted to wind a battery cell, an existing battery cell winding machine mostly adopts two half-type winding needles, the two half-type winding needles are in a separated state before winding, a gap is reserved between the two half-type winding needles for a diaphragm to penetrate, and the two half-type winding needles are combined into a whole after the diaphragm penetrates and clamp the diaphragm to be wound together.

In the prior art, a diaphragm exists in a central hole of a wound battery cell, and the diaphragm in the central hole of the battery cell is processed from the central position to the circumferential position of the central hole through a hole ironing process, so that subsequent contact pin bottom welding can be carried out; the processing procedure of the battery core is complicated.

SUMMERY OF THE UTILITY MODEL

The application provides a needle and electric core winder are rolled up to electric core processing procedure is complicated among the solution prior art, and leads to the centre bore to block up easily, causes the lower technical problem of yield of product.

According to a first aspect of the present application, there is provided a battery cell winding needle, including: a handle and a needle winding body;

one end of the needle winding body is connected with the end part of the handle; the needle winding body comprises a first needle body and a second needle body which are oppositely arranged, and the first needle body and the second needle body are arranged at intervals;

wherein, one side of the first needle body facing the second needle body is provided with a convex part, one side of the second needle body facing the first needle body is provided with a concave part, and the convex part extends into the concave part and has a gap with the inner wall of the concave part; the gap is used for a diaphragm to penetrate, and the diaphragm is wound on the winding needle body to form a battery cell.

In the embodiment of the application, the protruding part is arranged on one side of the first needle body facing the second needle body, the concave part is arranged on one side of the second needle body facing the first needle body, and the protruding part extends into the concave part; like this, when coiling electric core, because the diaphragm can be dodged to the depressed part, and the bulge can support the diaphragm, consequently, the diaphragm of central hole department is supported by the bulge on the internal perisporium of central hole, after accomplishing the coiling of electric core, can directly carry out the end welding, need not scald the hole to the central hole and handle, can simplify the manufacturing procedure of electric core, improve electric core quality and yield.

In one possible embodiment, a first guide surface is provided on the side of the first needle facing the second needle, said first guide surface connecting the circumferential wall of the first needle and the projection; the first guide surface is for guiding the penetration of the diaphragm into the gap.

Through setting up first guide face, can reduce the resistance that the diaphragm received when penetrating the clearance like this, can make things convenient for penetrating of diaphragm, avoid the striking of diaphragm with the bulge, effectively protect the diaphragm not destroyed, improved the yield of electric core.

In one possible embodiment, the first guide surface forms an angle of greater than or equal to 90 ° with the side wall of the projection.

Therefore, the phenomenon that the diaphragm has a larger corner on a travelling path when penetrating into the gap can be avoided, and the diaphragm can smoothly penetrate into the gap.

In one possible embodiment, the first guide surface is rounded off from the projection.

Therefore, the first guide surface and the side wall of the bulge part do not have abrupt corners, and the diaphragm can smoothly penetrate into the gap.

In one possible embodiment, a second guide surface is provided on the second needle body, said second guide surface connecting the circumferential wall of the second needle body to the recess; the second guide surface is arranged opposite to the first guide surface.

In a possible design mode, the peripheral wall of the first needle body and the peripheral wall of the second needle body enclose a cylindrical needle rolling body, and the diameter of the needle rolling body is 3.0-4.0 mm.

In a possible design, the sum of the radial thicknesses of the first needle body and the bulge is 2.3-2.7 mm, the size of the gap is 0.1-0.3 mm, and the radial thickness of the second needle body is 0.6-1.0 mm.

In one possible embodiment, the handle comprises a first handle and a second handle; the second handle is arranged on the first handle; the first needle body is connected with the first handle, and the second needle body is connected with the second handle.

In one possible embodiment, the end of the first handle has an escape portion, which is formed by a circumferential wall of the first handle being recessed in the radial direction, and the second handle is arranged on the escape portion.

Therefore, the second handle can form a complete cylindrical handle structure together with the first handle after being arranged on the first handle, and the integrity and the appearance of the integral appearance of the handle are ensured.

According to a second aspect of the present application, there is provided a battery cell winding machine including the battery cell winding pin provided in any one of the possible designs of the first aspect of the present application.

The construction of the present application and other objects and advantages thereof will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic cross-sectional view of a prior art needle-wound cell;

fig. 2 is a schematic overall structure diagram of a cell winding pin provided in an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a schematic diagram of an explosion structure of a battery cell winding needle provided in an embodiment of the present application;

FIG. 5 is a schematic view as viewed in the direction B of FIG. 2;

FIG. 6 is a schematic view as seen in the direction C of FIG. 2;

FIG. 7 is a schematic view as seen in the direction D of FIG. 4;

fig. 8 is a schematic cross-sectional view of a cell wound by a cell winding needle provided in an embodiment of the present application.

Description of reference numerals:

10-coiling the electric core;

11-a handle; 12-a needle winding body; 13-clearance;

111-a first handle; 112-a second handle; 121-a first needle body; 122-a second needle;

1111-an avoidance part; 1211-a projection; 1212-a first guiding surface; 1221-a recess; 1222-a second guide surface;

100-electric core; 101-a membrane; 102-central hole.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present application, it is to be understood that the terms "inner," "outer," "upper," "bottom," "front," "back," and the like, when used in the orientation or positional relationship indicated in FIG. 1, are used solely for the purpose of facilitating a description of the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

In the production and manufacturing process of the lithium battery, the most critical step is the winding of the battery core, and the service life and the safety performance of the lithium battery can be directly influenced by the winding quality of the battery core. Both cylindrical and square lithium batteries require wound cells.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a cell wound by a winding needle in the prior art. In the related art, a winding needle is generally used to wind a cell of a lithium battery, wherein the winding needle includes two half needles that are arranged opposite to each other, the two half needles are respectively semi-cylindrical, a gap for the membrane 101 to pass through is left between the two half needles, when the cell is wound, the membrane 101 is firstly inserted into the gap between the two half needles, then the two half needles clamp the membrane 101 and rotate, and the membrane 101 is wound on the peripheral wall of the two half needles to form the cell 100.

After the two half pins are pulled out, the transverse diaphragm 101 (for example, the transverse diaphragm 101 shown in fig. 1 along the diameter of the central hole 102) may remain at the central hole 102 of the lithium battery cell 100 wound in this way, which may cause the pin to pierce the diaphragm 101 when the pin is bottom-welded to the central hole 102, thereby resulting in the rejection of the cell 100. Therefore, after the winding of the battery cell 100 is completed, the center hole 102 of the battery cell 100 needs to be ironed to process the diaphragm 101 in the center hole 102 to the inner peripheral wall of the center hole 102, so that the bottom welding can be performed. This increases the processing steps of the battery cell 100, and easily causes the central hole 102 to be blocked, resulting in a low product yield.

In view of the technical problems in the related art in processing and producing the lithium battery cell 100, the embodiment of the present application provides a cell winding needle, and the main idea is to set the thicknesses of two half needles of the winding needle to be unequal, specifically, one of the half needles is provided with a protruding portion, and the other half needle is provided with a recessed portion; the bulge extends into the depression to let keep the clearance that a diaphragm can penetrate between the lateral wall of bulge and depression, like this when coiling electric core, the diaphragm penetrates in this clearance, and the bulge can support the diaphragm to deviate centre bore central point and put, and the diaphragm of centre bore center department can be eccentric to the internal perisporium one side of centre bore promptly, can not lead to the fact the influence to follow-up spot welding, can simplify electric core manufacturing procedure, improves electric core quality and yield.

In a first aspect, referring to fig. 2, fig. 2 is a schematic view of an overall structure of a cell winding needle provided in an embodiment of the present application. The embodiment of the application provides a needle 10 is rolled up to electric core, includes: a handle 11 and a needle winding body 12.

The handle 11 may be hand-held by a winder or may be mounted on a core winder. The handle 11 may be provided with a fixing and mounting hole so that the handle 11 may be mounted on the electrical core winder by a fixing member such as a screw, a bolt, or the like.

It will be appreciated that a spline groove or a spline may also be provided on the handle 11, and the handle is fixedly mounted relative to the electrical core winder through the spline groove or the spline.

One end of the needle winding body 12 is connected with the end part of the handle 11; the needle rolling body 12 comprises a first needle body 121 and a second needle body 122 which are oppositely arranged, and the first needle body 121 and the second needle body 122 are arranged at intervals.

Specifically, the needle winding body 12 may be fixedly connected to an end of the handle 11, and as illustrated in fig. 2 as an example, the needle winding body 12 may be formed to extend outward from the end of the handle 11 in an axial direction of the handle 11, that is, the needle winding body 12 may be integrally formed with the handle 11.

Wherein, the first needle body 121 is provided with a protruding portion 1211 on one side facing the second needle body 122, the second needle body 122 is provided with a recessed portion 1221 on one side facing the first needle body 121, the protruding portion 1211 extends into the recessed portion 1221, and has a gap 13 with the inner wall of the recessed portion 1221, the gap 13 is used for a membrane to penetrate, and the membrane is wound on the needle winding body 12 to form a battery cell.

Specifically, the protrusion 1211 and the first needle 121 may be coaxial and semi-cylindrical, and the radius or diameter of the protrusion 1211 is slightly smaller than the radius or diameter of the first needle 1211. That is, the projection 1211 may be an eccentric projection of the first needle 1211 projecting from a plane toward the second needle 122. And the recess 1221 may be formed by recessing the plane of the second pin 122 away from the first pin 121.

In some possible ways, the second needle body 122 may also be an arc-shaped thin sheet, and the concave surface of the arc-shaped thin sheet covers one side of the projection 1211 and maintains a gap 13 with the side wall of the projection 1211.

Alternatively, in the embodiment of the present application, the circumferential walls of the first needle body 121 and the second needle body 122 may surround the cylindrical needle winding body 12. The circumferential wall of cylindrical needle winding body 12 may be polished smooth or mirror-finished. Specifically, the first needle body 121 and the second needle body 122 can be made of stainless steel, so that the friction between the first needle body 121 and the second needle body 122 and the septum 101 can be reduced, and the battery cell 100 can be conveniently dismounted from the needle winding body 12 after being wound. Meanwhile, the strength of the first needle 121 and the second needle 122 can also be ensured.

In some possible examples, the peripheral walls of the first and second needles 121 and 122 may be further coated with a nano material, and the friction between the first and second needles 121 and 122 and the septum 101 may be reduced by coating the nano material.

It is understood that the sidewalls of the protrusion 1211 and the recess 1221 may be polished smooth or coated with nano-material.

As a specific example, in the embodiment of the present application, the surface roughness of the first needle 1211 and the second needle 1221 is less than or equal to 1.0 μm. Of course, the surface roughness of the protrusion 1211 and the recess 1221 may be the same as that of the first needle body 121 or the second needle body 122.

In the embodiment of the present application, the protrusion 1211 is disposed on the side of the first needle body 121 facing the second needle body 122, the recess 1221 is disposed on the side of the second needle body 122 facing the first needle body 121, and the protrusion 1211 extends into the recess 1221; in this way, when the battery cell 100 is wound, since the recess 1221 is retracted from the diaphragm 101 and the projection 1211 is pressed against the diaphragm 101, the diaphragm 101 at the center hole 102 is pressed against the inner peripheral wall of the center hole 102 by the projection 1211, and after the winding of the battery cell 100 is completed, the bottom welding can be directly performed, the hole ironing process for the center hole 102 is not required, the processing procedure of the battery cell 100 can be simplified, and the battery cell quality and the yield can be improved.

Further, referring to fig. 3 to 7, fig. 3 is a partial enlarged view at a in fig. 2, fig. 4 is a schematic view of an explosion structure of a cell winding needle provided in an embodiment of the present application, fig. 5 is a schematic view viewed along a direction B in fig. 2, fig. 6 is a schematic view viewed along a direction C in fig. 2, and fig. 7 is a schematic view viewed along a direction D in fig. 4.

In the present embodiment, a first guiding surface 1212 is provided on a side of the first needle body 121 facing the second needle body 122, and the first guiding surface 1212 connects the peripheral wall of the first needle body 121 and the projection 1211; the first guide surface 1212 is used to guide the septum into the gap 13.

Specifically, the first guide surfaces 1212 are two, and the two first guide surfaces 1212 are located on both sides of the projection 1211 and are symmetrically disposed with respect to the projection 1211.

Through setting up first guide face 1212, can reduce the resistance that diaphragm 101 received when penetrating clearance 13 like this, can make things convenient for the penetration of diaphragm 101, avoid the striking of diaphragm 101 with bulge 1211, effectively protect diaphragm 101 not destroyed, improved the yield of electric core.

Meanwhile, the diaphragm 101 penetrating into the gap 13 is bent along the first guide surface 1212, the side wall of the protruding portion 1211 and the other first guide surface 1212 due to the first guide surface 1212, and such bending can prevent the diaphragm 101 from falling out, that is, the two first guide surfaces 1212 support the diaphragm 101 during winding, thereby ensuring smooth winding.

Further, the first guide surface 1212 makes an angle with the side wall of the projection 1211 greater than or equal to 90 °.

That is, in the embodiment of the present application, the first guide surface 1212 mainly prevents the diaphragm 101 from having a large corner in the travel path when penetrating into the gap 13, and ensures that the diaphragm 101 can smoothly penetrate into the gap 13.

In some possible examples, the first guide surface 1212 is rounded off from the projection 1211.

Thus, there is no abrupt corner between the first guide surface 1212 and the side wall of the projection 1211, ensuring that the diaphragm 101 can smoothly penetrate into the gap 13.

Further, a second guide surface 1222 is provided on the second needle body 122, and the second guide surface 1222 connects the peripheral wall of the second needle body 122 and the recessed portion 1221; the second guide surface 1222 is disposed opposite the first guide surface 1212.

Specifically, the second guiding surface 1222 may be disposed in the same manner as the first guiding surface 1212, which is not described in detail in this embodiment of the present application.

Optionally, the circumferential wall of the first needle body 121 and the circumferential wall of the second needle body 122 enclose a cylindrical needle winding body 12, and the diameter L1 of the needle winding body 12 is 3.0-4.0 mm.

Further, the sum L2 of the radial thicknesses of the first needle 121 and the protruding portion 1211 is 2.3 to 2.7mm, the size of the gap 13 is 0.1 to 0.3mm, and the radial thickness L3 of the second needle 122 is 0.6 to 1.0 mm.

It is understood that the diameter of the needle winding body 12, the sum of the radial thicknesses of the first needle body 121 and the projection 1211, the size of the gap 13, and the radial thickness of the second needle body 122 may be adjusted according to example production needs.

In a specific example, taking a 18650 model lithium ion battery as an example, the diameter of the winding needle body 12 in the embodiment of the present application may be 3.5 mm; the sum of the radial thicknesses of the first needle body 121 and the projection 1211 is 2.5 mm; the size of the gap 13 is 0.2 mm; the second needle body 122 has a radial thickness of 0.8 mm.

Optionally, in the embodiment of the present application, the handle 11 includes a first handle 111 and a second handle 112; the second handle 112 is disposed on the first handle 111; the first needle 121 is connected to the first handle 111 and the second needle 122 is connected to the second handle 112.

Specifically, a fixing hole may be formed in the first handle 111; meanwhile, a fixing hole is also formed in the second handle 112, and the second handle 112 is fixed to the first handle 111 by a bolt, a screw, or the like.

In some possible modes, the end of the first handle 111 has a relief 1111, the relief 1111 is formed by a circumferential wall of the first handle 111 being recessed in the radial direction, and the second handle 112 is provided on the relief 1111.

Thus, the second handle 112 is mounted on the first handle 111 to form a complete cylindrical handle structure with the first handle 111, thereby ensuring the integrity and appearance of the handle 11.

Referring to fig. 8, fig. 8 is a schematic cross-sectional view of a cell wound by a cell winding needle according to an embodiment of the present application.

When the cell winding needle 10 provided by the embodiment of the application is used specifically, the membrane 101 is firstly inserted into the gap 13, and when the membrane is inserted, the membrane can be conveniently inserted into the gap 13 through the first guide surface 1212 or the second guide surface 1222, and the membrane 101 is bent under the support of the first guide surface 1212 and the second guide surface 1222, so that the membrane 101 can be prevented from being separated from the gap 13; then, the handle 11 is rotated, and the separator 101 is wound around the circumferential wall of the winding needle body 12, thereby forming the battery cell 100. After the battery cell 100 is detached from the needle winding body 12, due to the cooperation of the protrusion 1211 and the recess 1221, the diaphragm 101 at the central hole 102 is pressed against the inner peripheral wall of the central hole 102, as shown in fig. 8. Therefore, the battery cell 100 can be directly subjected to bottom welding, the hot hole processing of the central hole 102 is not needed, the production and manufacturing processes of the battery cell 100 can be simplified, and the yield of the battery cell 100 is improved.

In a second aspect, an embodiment of the present application further provides a battery cell winding machine, including the battery cell winding pin 10 provided in any optional embodiment of the first aspect of the present application. The electric core winder can simplify the production and manufacturing procedures of the electric core 100 and improve the yield of the electric core 100.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A battery core winding needle is characterized by comprising: a handle (11) and a needle winding body (12);

one end of the needle winding body (12) is connected with the end part of the handle (11); the needle rolling body (12) comprises a first needle body (121) and a second needle body (122) which are oppositely arranged, and the first needle body (121) and the second needle body (122) are arranged at intervals;

wherein, one side of the first needle body (121) facing the second needle body (122) is provided with a convex part (1211), one side of the second needle body (122) facing the first needle body (121) is provided with a concave part (1221), the convex part (1211) extends into the concave part (1221), and a gap (13) is formed between the convex part and the inner wall of the concave part (1221); the gap (13) is used for a diaphragm to penetrate, and the diaphragm is wound on the winding needle body (12) to form a battery core.

2. The cell winding needle according to claim 1, characterized in that a first guide surface (1212) is provided on a side of the first needle body (121) facing the second needle body (122), the first guide surface (1212) connecting a peripheral wall of the first needle body (121) and the projection (1211); the first guide surface (1212) is for guiding the penetration of the septum into the gap (13).

3. The cell winding needle according to claim 2, wherein the first guide surface (1212) and the side wall of the projection (1211) form an angle greater than or equal to 90 °.

4. The cell winding needle according to claim 2 or 3, wherein the first guide surface (1212) is rounded off from the projection (1211).

5. The cell winding needle according to claim 2 or 3, characterized in that a second guiding surface (1222) is provided on the second needle body (122), the second guiding surface (1222) connecting the peripheral wall of the second needle body (122) with the recess (1221); the second guide surface (1222) is disposed opposite to the first guide surface (1212).

6. The battery core winding needle according to claim 1, wherein the peripheral wall of the first needle body (121) and the peripheral wall of the second needle body (122) enclose a cylindrical winding needle body (12), and the diameter of the winding needle body (12) is 3.0-4.0 mm.

7. The cell winding needle according to claim 6, wherein the sum of the radial thicknesses of the first needle body (121) and the projection (1211) is 2.3-2.7 mm, the size of the gap (13) is 0.1-0.3 mm, and the radial thickness of the second needle body (122) is 0.6-1.0 mm.

8. The electrical core winding needle of claim 1, wherein the handle comprises a first handle (111) and a second handle (112); the second handle (112) is arranged on the first handle (111); the first needle body (121) is connected with the first handle (111), and the second needle body (122) is connected with the second handle (112).

9. The cell winding needle according to claim 8, wherein the end of the first handle (111) is provided with a relief portion (1111), the relief portion (1111) is formed by radially recessing a peripheral wall of the first handle (111), and the second handle (112) is arranged on the relief portion (1111).

10. A cell winder, characterized in that it comprises a cell winding pin (10) according to any of claims 1 to 9.

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