CN216648406U - Lithium battery winding mechanism and winding device - Google Patents

Abstract

The utility model provides a lithium battery winding mechanism and a winding device, which relate to the technical field of battery core manufacturing. The lithium battery winding mechanism includes a winding needle assembly, a retractable top holder and a fixing frame. The needle rolling assembly is provided with an internal cavity, the outer peripheral surface of the needle rolling assembly is a winding surface, and the winding surface is provided with a through hole communicating with the internal cavity. The jacking piece is arranged in the inner cavity, one end of the jacking piece is connected with the fixing frame, and the other end can extend out of the winding surface through the through hole. During the winding process of the battery core, the top holder extends out of the winding surface to resist the battery core or retracts into the winding surface to separate from the battery core, so that the stress of the pole piece and the diaphragm can be released during the winding process. , to prevent the internal deformation or distortion of the cell, and improve the performance and safety of the cell.

Description

A lithium battery winding mechanism and winding device

technical field

The utility model relates to the technical field of battery cell manufacturing, in particular to a lithium battery winding mechanism and a winding device.

Background technique

Winding is an indispensable and particularly important process in the production and manufacture of lithium-ion batteries. The specific method is to fix the laser-cut pole piece on the winding needle, and rotate with the winding needle to separate the separator and the positive electrode. Sheets, separators and negative electrode sheets are rolled into a multi-layer roll core.

When most of the existing square lithium batteries with larger widths are wound with an oval winding needle, they are flattened by a circle after the winding is completed, and the batteries are cold and hot pressed into square batteries. Since the cross-section of the winding needle is rounder, the winding core will be more tightly fitted during the winding process. When the battery cell is rounded and flattened after winding, the internal stress of the pole piece and the diaphragm cannot be released, which will cause winding. The internal deformation and distortion of the core affect the performance and safety of the battery.

Utility model content

The purpose of the utility model is to provide a lithium battery winding mechanism and a winding device, which can wind a battery cell with a larger width, and can effectively release the stress of the diaphragm and the pole piece to prevent deformation or distortion of the battery core.

The embodiment of the present utility model is realized in this way:

In a first aspect, the present utility model provides a lithium battery winding mechanism for winding a battery cell, including a needle winding assembly, a retractable top holder and a fixing frame;

The needle rolling assembly is provided with an internal cavity, the outer peripheral surface of the needle rolling assembly is a winding surface, and the winding surface is provided with a through hole communicating with the internal cavity;

The jacking piece is arranged in the inner cavity, one end of the jacking piece is connected with the fixing frame, and the other end can extend out of the winding surface through the through hole;

The jacking member is used for telescopic motion during the winding process of the battery core, so as to abut the battery core under the condition of protruding out of the winding surface.

In an optional implementation manner, the lithium battery winding mechanism further includes an elastic block, and the elastic block is disposed at one end of the top member against the battery cell.

In an optional embodiment, the distance by which the elastic block protrudes from the winding surface is 0.1 mm˜5 mm.

In an optional embodiment, a groove is formed on the winding surface, and the through hole is formed on a bottom wall of the groove.

In an optional embodiment, the number of the grooves includes a plurality of grooves, and a plurality of the grooves are equiangularly distributed on the winding surface.

In an optional embodiment, the needle winding assembly includes a first needle body and a second needle body, and the cross-sections of the first needle body and the second needle body are both semicircular.

In an optional embodiment, the first needle body and the second needle body can move towards each other, and the first needle body and the second needle body move towards each other to clamp the battery cell the diaphragm.

In an optional embodiment, the lithium battery winding mechanism further includes an airbag, and the airbag is disposed between the first needle body and the second needle body, for when the airbag is inflated The diaphragm of the battery cell is clamped with the first needle body or the second needle body.

In an optional embodiment, the jacking member is a cylinder, and the pressure range of the cylinder is 0.1 MPa to 0.2 MPa.

In a second aspect, the present invention provides a winding device, comprising the lithium battery winding mechanism according to any one of the foregoing embodiments.

The beneficial effects of the lithium battery winding mechanism and the winding device provided by the embodiments of the present utility model include: protruding out of the winding surface through the jacking member disposed in the inner cavity of the needle winding assembly to press against the battery cell or retract it It can be separated from the battery core to the winding surface, so that the stress of the pole piece and the diaphragm can be released during the winding process, preventing the internal deformation or distortion of the battery core, thereby improving the performance and safety of the battery core.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a lithium battery winding mechanism provided by an embodiment of the present invention.

Icon: 10-Lithium battery winding mechanism; 100-Rolling needle assembly; 110-Internal cavity; 120-Rolling surface; 130-Groove; 140-First needle body; 150-Second needle body; 200-Top Holder; 300-elastic block; 400-airbag.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that is usually placed when the utility model product is used, only for the convenience of describing the present utility model and simplifying the description, not Indicates or implies that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As digital products, drones, model aircraft, power tools, new energy vehicles, portable energy storage and medical equipment and other fields widely use lithium batteries as power sources, the lithium battery industry has achieved rapid development. Cell sizes are also becoming more and more diverse.

Some existing square lithium batteries need to be wound with a larger width, usually the width of the battery is 500mm to 2000mm. The winding needle usually adopts an oval winding needle or a circular winding needle, and the above-mentioned winding needle will make the cell fit more and more tightly when winding the cell, resulting in the stress in the pole piece of the cell and the diaphragm. If it cannot be released, it will cause the internal deformation or distortion of the cell, thereby affecting the performance and safety of the cell.

Please refer to FIG. 1, in order to solve the above problems, the present utility model provides a winding device (not shown in the figure), the winding device includes a lithium battery winding mechanism 10, a driving mechanism and a blanking mechanism, etc., which can be used during the winding process. The lithium battery winding mechanism 10 for releasing the stress of the pole piece and the separator of the battery cell.

The lithium battery winding mechanism 10 includes a needle winding assembly 100 , a retractable jack 200 , a fixing frame (not shown) elastic block 300 and an airbag 400 .

The needle rolling assembly 100 is provided with an inner cavity 110 , and the outer peripheral surface of the needle rolling assembly 100 is a winding surface 120 .

In this embodiment, the needle winding assembly 100 is fixed on a fixing member (not shown), and the cross section of the needle winding assembly 100 is generally circular or oval. The needle winding assembly 100 can use a single turret type but is not limited to a single turret type, and can also choose a double turret type or other methods according to requirements.

It should be noted that the battery cell usually includes a positive electrode sheet, a negative electrode sheet and a separator. Before winding, it is usually wound around the needle winding assembly 100 from the outside to the inside in the order of the separator, negative electrode sheet, separator and positive electrode sheet. .

The jacking member 200 is disposed in the inner cavity 110 , one end of the jacking member 200 is connected to the fixing frame, and the other end can extend out of the winding surface 120 through the through hole. The jacking member 200 is used for telescopic motion during the winding process of the battery cell, so as to press against the battery core when it extends out of the winding surface 120 .

In this embodiment, since the cylindrical or nearly cylindrical winding needle will make the battery core more and more tightly wound during winding, during the winding process of the battery core, the empty space inside the winding needle assembly 100 is provided by the winding needle. The jacking member 200 in the cavity 110 protrudes out of the winding surface 120 to abut the battery cell being wound, so that the winding radius of the wound battery core is slightly larger than the radius of the needle winding assembly 100. When the core is wound more and more tightly, the top holder 200 is retracted into the winding surface 120 to be separated from the cell, thereby releasing the stress of the pole piece and the diaphragm, preventing the internal deformation of the cell in the subsequent processing process Or the problem of distortion, thereby improving the performance and safety of the battery.

Of course, the situation that the top holding member 200 abuts against the battery cell is not limited to this. The top holding member 200 can be extended or retracted when the needle winding assembly 100 is wound to a specified angle, or the top holding member 200 can be wound to a predetermined angle. Extend or retract when the length is set, or extend or retract when the cell is wound to a preset number of turns, as long as the jack 200 can extend and resist during the winding process The cell can be retracted to separate from the cell so as to release the stress of the pole piece and the diaphragm, which is not specifically limited here.

Further, the elastic block 300 is disposed at one end of the jacking member 200 that is against the battery cell.

In this embodiment, an elastic block 300 is provided at the end of the jacking member 200, and the elastic block 300 presses against the battery cell, which can play a certain buffering effect and prevent the battery cell from being damaged when it is pressed against the battery cell. Not only this, when the cell is wound more and more tightly, the elastic block 300 generates elastic deformation, which can further relieve the stress of the pole piece and the diaphragm, and prevent the internal deformation or distortion of the cell.

Further, the distance by which the elastic block 300 protrudes from the winding surface 120 is 0.1 mm˜5 mm.

In this embodiment, the elastic block 300 can protrude from the winding surface by 120.1 mm to 5 mm under the driving of the jacking member 200. Since the stress generated by different cells during the winding process is different, it can be used for different cells. The elastic block 300 is extended by different distances to ensure that the stress of the pole piece and the diaphragm is released during the winding process, and at the same time to prevent the cell from being damaged, improve the yield and adaptability of the lithium battery core winding mechanism, and enable it to be widely used. Applied to a variety of batteries of different specifications.

Further, a groove 130 is formed on the winding surface 120 , and a through hole is formed on the bottom wall of the groove 130 .

In this embodiment, the groove 130 can provide a accommodating space for the blanking jaws in the blanking mechanism, so that the blanking jaws can extend into the grooves 130 to clamp the battery cells after the winding is completed. The battery cell is removed from the needle winding assembly 100 .

Further, the number of the grooves 130 includes a plurality, and the plurality of grooves 130 are equiangularly distributed on the winding surface 120 .

In this embodiment, the number of the jacking members 200 also includes a plurality, and the plurality of the jacking members 200 are in one-to-one correspondence with the plurality of grooves 130 .

Specifically, the number of the grooves 130 and the jacking members 200 are both six, and the six grooves 130 and the jacking members 200 are distributed in a circle, and any two adjacent grooves 130 are at the center angle of the needle winding assembly 100 The angle is 60°, so that the grooves 130 and the jacking members 200 are evenly distributed on the winding surface 120, so that when the plurality of jacking members 200 are pressed against the battery cells at the same time, the cells are evenly stressed, so as to effectively release the stress. Purpose.

Further, the needle rolling assembly 100 includes a first needle body 140 and a second needle body 150, and the cross-sections of the first needle body 140 and the second needle body 150 are both semicircular.

In this embodiment, the first needle body 140 and the second needle body 150 can be spliced together so that the cross section of the needle winding assembly 100 is circular, that is, the winding surface 120 is cylindrical. The material of the first needle body 140 and the second needle body 150 is ceramic or stainless steel plated ceramic, and the battery core is wound through the first needle body 140 and the second needle body 150, so that the battery core can be wound to achieve an ideal cylindricity and tightness.

Of course, the cross-sections and materials of the first needle body 140 and the second needle body 150 may also be other settings, which are not specifically limited herein.

Further, the first needle body 140 and the second needle body 150 can move towards each other, and the first needle body 140 and the second needle body 150 move towards each other to clamp the diaphragm of the battery cell.

In this embodiment, the lithium battery winding mechanism 10 further includes a driving member (not shown), and the first needle body 140 and/or the second needle body 150 can move under the driving of the driving member, that is, the first needle body 140 And the second needle body 150 can be a bilateral movable type or a unilateral movable type.

In practical application, before winding, the first needle body 140 and the second needle body 150 are moved away from each other by the driving member, the diaphragm is placed between the first needle body 140 and the second needle body 150, and then the driving member The first needle body 140 and the second needle body 150 move toward each other to clamp and fix the septum.

Further, the airbag 400 is disposed between the first needle body 140 and the second needle body 150 , and is used to clamp the diaphragm of the battery cell with the first needle body 140 or the second needle body 150 when the airbag 400 is inflated.

In this embodiment, the airbag 400 is disposed on the first needle body 140 (or the second needle body 150 ), and the airbag 400 is inflated under the condition that the first needle body 140 and the second needle body 150 clamp the diaphragm, so that the diaphragm is inflated It is tightly fixed between the air bag 400 and the second needle body 150 (or the first needle body 140 ) under the pressing of the air bag 400 , so as to ensure that the septum is relatively opposite to the first needle body 140 and the first needle body 140 when the needle rolling assembly 100 is wound. The second needle body 150 is not loose, and maintains the alignment with the pole piece to prevent the diaphragm from wrinkling and deviating, which affects the winding effect of the cell.

Further, the jacking member 200 is a cylinder, and the pressure range of the cylinder is 0.1MPa-0.2MPa.

In this embodiment, the pressure of the air cylinder is controllable, and it is controlled at 0.1 MPa to 0.2 MPa, which can ensure that the air cylinder can resist the cell to release the stress of the pole piece and the diaphragm, and can prevent damage due to excessive resistance. Batteries.

To sum up, the present invention provides a battery cell that is being wound by protruding out of the winding surface 120 through the ejector 200 disposed in the inner cavity 110 of the needle winding assembly 100 , so that the electric core is being wound. The winding radius of the wound battery core is slightly larger than the radius of the needle winding assembly 100. When the wound battery core is wound more and more tightly, the jacking member 200 retracts into the winding surface 120 to be separated from the battery core. As a result, the stress of the pole piece and the diaphragm can be released, preventing the internal deformation or distortion of the battery cell from occurring in the subsequent processing process, thereby improving the performance and safety of the battery core. The elastic block 300 against the battery can play a certain buffering role, and when the winding of the battery becomes tighter and tighter, the elastic deformation is generated by the elastic block 300, which can further release the stress of the pole piece and the diaphragm. Prevents internal deformation or twisting of the cell. The groove 130 can provide an accommodating space for the blanking jaws in the blanking mechanism, so that the blanking jaws can extend into the grooves 130 to clamp the wound cells and remove the cells from the winding needle assembly. 100 removed. The air bag 400 is disposed between the first needle body 140 and the second needle body 150 , and the air bag 400 is inflated under the condition that the first needle body 140 and the second needle body 150 clamp the diaphragm, so that the diaphragm is squeezed by the air bag 400 . It is tightly fixed between the air bag 400 and the second needle body 150 (or the first needle body 140 ) to ensure that the septum is not loose relative to the first needle body 140 and the second needle body 150 when the needle winding assembly 100 is wound. , and maintain the alignment with the pole piece to prevent the diaphragm from wrinkling and deviation, which will affect the winding effect of the cell.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A lithium battery winding mechanism for winding a battery cell, characterized in that it comprises a needle winding assembly, a retractable jack and a holder; The needle rolling assembly is provided with an internal cavity, the outer peripheral surface of the needle rolling assembly is a winding surface, and the winding surface is provided with a through hole communicating with the internal cavity; The jacking piece is arranged in the inner cavity, one end of the jacking piece is connected with the fixing frame, and the other end can extend out of the winding surface through the through hole; The jacking member is used for telescopic motion during the winding process of the battery core, so as to abut the battery core under the condition of protruding out of the winding surface. 2 . The lithium battery winding mechanism according to claim 1 , wherein the lithium battery winding mechanism further comprises an elastic block, and the elastic block is disposed at an end of the top supporter against the battery cell. 3 . . 3 . The lithium battery winding mechanism according to claim 2 , wherein the distance by which the elastic block protrudes from the winding surface is 0.1 mm˜5 mm. 4 . 4 . The lithium battery winding mechanism according to claim 1 , wherein a groove is formed on the winding surface, and the through hole is formed on the bottom wall of the groove. 5 . 5 . The lithium battery winding mechanism according to claim 4 , wherein the number of the grooves includes a plurality, and the plurality of the grooves are equiangularly distributed on the winding surface. 6 . 6 . The lithium battery winding mechanism according to claim 1 , wherein the needle winding assembly comprises a first needle body and a second needle body, and the transverse direction of the first needle body and the second needle body is 6 . The sections are semicircular. 7 . The lithium battery winding mechanism according to claim 6 , wherein the first needle body and the second needle body can move away from each other or move towards each other, and the first needle body and the second needle body can move towards each other. 8 . The needle bodies move toward each other to clamp the septum of the cell. 8 . The lithium battery winding mechanism according to claim 7 , wherein the lithium battery winding mechanism further comprises an airbag, and the airbag is arranged between the first needle body and the second needle body. 9 . , which is used to clamp the diaphragm of the battery cell with the first needle body or the second needle body when the airbag is inflated. 9 . The lithium battery winding mechanism according to claim 1 , wherein the jacking member is an air cylinder, and the pressure range of the air cylinder is 0.1 MPa to 0.2 MPa. 10 . 10. A winding device, characterized by comprising the lithium battery winding mechanism according to any one of claims 1-9.

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