CN216648406U

CN216648406U - Lithium battery winding mechanism and winding device

Info

Publication number: CN216648406U
Application number: CN202123141635.8U
Authority: CN
Inventors: 周中心; 李利潮; 张卫龙; 张五堂
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-05-31
Anticipated expiration: 2031-12-14

Abstract

The utility model provides a lithium battery winding mechanism and a winding device, and relates to the technical field of battery core manufacturing. Lithium cell winding mechanism holds piece and mount including rolling up needle subassembly, telescopic top. The winding needle assembly is provided with an internal cavity, the peripheral surface of the winding needle assembly is a winding surface, and a through hole communicated with the internal cavity is formed in the winding surface. 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 of the jacking piece can extend out of the winding surface through the through hole. The jacking piece stretches out of the winding surface to abut against the battery cell or retracts into the winding surface to separate from the battery cell in the process of winding the battery cell, so that the stress of the pole piece and the diaphragm can be released in the winding process, the internal deformation or distortion of the battery cell is prevented, and the performance and the safety of the battery cell are improved.

Description

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

The winding is an essential and important process in the production and manufacturing process of the lithium ion battery, and the specific mode is that the pole piece cut by laser is fixed on a winding needle and rotates along with the winding needle to roll the diaphragm, the positive pole piece, the diaphragm and the negative pole piece into a multilayer winding core shape.

When most of the existing square lithium battery cells with large width are wound by using an oval winding needle, the cells are flattened circularly after the winding is finished, and the cells are cooled and hot-pressed into the square cells. Because the cross section of book needle is round more, can make roll up the core and also tighter at the laminating of coiling in-process, after electric core after accomplishing around the book becomes flat by the circle, pole piece and the unable release of unfamiliar internal stress can cause the inside deformation of roll core and distortion, influence electric core performance and security.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lithium battery winding mechanism and a winding device, which can wind a battery cell with a larger width, effectively release the stress of a diaphragm and a pole piece and prevent the battery cell from deforming or twisting.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the utility model provides a lithium battery winding mechanism, which is used for winding a battery cell and comprises a winding needle assembly, a telescopic jacking piece and a fixing frame;

the winding needle assembly is provided with an internal cavity, the peripheral surface of the winding needle assembly is a winding surface, and a through hole communicated with the internal cavity is formed in the winding surface;

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

the jacking piece is used for performing telescopic motion in the process of winding the battery core so as to prop against the battery core under the condition of extending out of the winding surface.

In an optional embodiment, the lithium battery winding mechanism further includes an elastic block, and the elastic block is disposed at one end of the supporting member, which abuts against the battery core.

In an alternative embodiment, the elastic block extends beyond the winding surface by a distance of 0.1mm to 5 mm.

In an alternative embodiment, the winding surface is provided with a groove, and the through hole is provided in a bottom wall of the groove.

In an alternative embodiment, the number of the grooves includes a plurality of grooves, and the plurality of grooves are distributed on the winding surface at equal angles.

In an alternative embodiment, the needle rolling assembly comprises a first needle body and a second needle body, and the cross section of the first needle body and the cross section of the second needle body are semicircular.

In an alternative embodiment, the first needle and the second needle may move away from each other or towards each other, and the first needle and the second needle move towards each other to clamp the membrane of the battery cell.

In an optional embodiment, the lithium battery winding mechanism further includes an air bag disposed between the first needle and the second needle, and configured to clamp the membrane of the battery cell with the first needle or the second needle when the air bag is inflated.

In an optional embodiment, the supporting member is a cylinder, and the pressure of the cylinder ranges from 0.1MPa to 0.2 MPa.

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

The lithium battery winding mechanism and the lithium battery winding device provided by the embodiment of the utility model have the beneficial effects that: the jacking piece arranged in the inner cavity of the winding needle assembly stretches out of the winding surface to abut against the battery cell or retracts into the winding surface to separate from the battery cell, so that the stress of the pole piece and the diaphragm can be released in the winding process, the internal deformation or distortion of the battery cell is prevented, and the performance and the safety of the battery cell are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a lithium battery winding mechanism according to an embodiment of the present invention.

Icon: 10-a lithium battery winding mechanism; 100-a needle winding assembly; 110-an internal cavity; 120-a winding surface; 130-a groove; 140-a first needle body; 150-a second needle body; 200-a top holder; 300-an elastic block; 400-air bag.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained 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", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

With the adoption of a large number of lithium batteries as power supplies in the fields of digital products, unmanned aerial vehicles, aeromodelling, electric tools, new energy vehicles, portable energy storage, medical equipment and the like, the lithium battery industry has been rapidly developed. The cell size is also more and more diversified.

Some existing square lithium battery cells are formed by winding battery cells with large widths, and the width of the battery cells is usually 500-2000 mm. The needle of rolling up of coiling adopts oval book needle or circular book needle usually, and above-mentioned book needle can make electric core laminating more and more tight when coiling electric core, leads to the unable release of stress in the pole piece of electric core and the diaphragm, can cause the inside deformation of electric core or distortion to influence the performance and the security performance of electric core.

Referring to fig. 1, in order to solve the above problems, the present invention provides a winding device (not shown) including a lithium battery winding mechanism 10, a driving mechanism, a blanking mechanism, and the like, wherein the lithium battery winding mechanism 10 is capable of releasing stress of a pole piece and a diaphragm of a battery cell during a winding process.

The lithium battery winding mechanism 10 comprises a winding pin assembly 100, a retractable supporting member 200, a fixing frame (not shown) elastic block 300 and an air bag 400.

The needle winding assembly 100 has an inner cavity 110, the outer circumferential surface of the needle winding assembly 100 is a winding surface 120, and the winding surface 120 is provided with a through hole (not shown) communicating with the inner cavity 110.

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

It should be noted that, the battery cell generally includes a positive plate, a negative plate and a separator, and before winding, the battery cell is usually wound around the winding needle assembly 100 from outside to inside in the arrangement order of the separator, the negative plate, the separator and the positive plate.

The supporting member 200 is disposed in the inner cavity 110, one end of the supporting member 200 is connected to the fixing frame, and the other end of the supporting member extends out of the winding surface 120 through the through hole. The supporting member 200 is used for performing a telescopic motion during the winding process of the battery cell so as to support the battery cell while extending out of the winding surface 120.

In this embodiment, because the cylindrical or approximately cylindrical winding needle can make the battery cell more and more compact in winding, during the process of winding the battery cell, the supporting member 200 disposed in the internal cavity 110 of the winding needle assembly 100 extends out of the winding surface 120 to support the winding battery cell, so that the winding radius of the winding battery cell is slightly larger than the radius of the winding needle assembly 100, and when the winding battery cell is wound more and more compact, the supporting member 200 retracts into the winding surface 120 to separate from the battery cell, thereby releasing the stress of the pole piece and the diaphragm, preventing the internal deformation or distortion of the battery cell in the subsequent processing technology, and further improving the performance and safety of the battery cell.

Of course, the situation that the supporting member 200 supports the battery cell is not limited to this, and the supporting member 200 may extend or retract when the winding pin assembly 100 is wound to a specified angle, or extend or retract when the battery cell is wound to a preset length, or extend or retract when the battery cell is wound to a preset number of turns, as long as the supporting member 200 can extend and support the battery cell or retract to separate from the battery cell in the winding process so as to achieve the purpose of releasing the stress of the pole piece and the diaphragm, which is not limited in detail herein.

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

In this embodiment, the elastic block 300 is disposed at the end of the supporting member 200, and the battery cell is supported by the elastic block 300, so that a certain buffering effect can be achieved, and the battery cell is prevented from being damaged when the battery cell is supported. Not only with this, under the more and more tight condition of electric core coiling, produce elastic deformation through elastic block 300, can further realize releasing the stress of pole piece and diaphragm, prevent the internal deformation or the distortion of electric core.

Further, the distance by which the elastic block 300 extends out of the winding surface 120 is 0.1mm to 5 mm.

In this embodiment, the elastic block 300 can stretch out of the winding surface by 120.1mm to 5mm under the driving of the supporting member 200, and because the stresses generated by different battery cells in the winding process are different, the elastic block 300 can stretch out by different distances according to different battery cells, so that the battery cells can be prevented from being damaged while the stresses of the pole pieces and the diaphragms are released in the winding process, the yield and the adaptability of the lithium battery core winding mechanism are improved, and the lithium battery core winding mechanism can be widely applied to the battery cells with various specifications.

Further, the winding surface 120 is provided with a groove 130, and the through hole is provided in the bottom wall of the groove 130.

In this embodiment, the groove 130 may provide an accommodating space for the blanking clamping jaw in the blanking mechanism, so that the blanking clamping jaw can extend into the groove 130 to clamp the completely wound battery core and take the battery core down from the winding needle assembly 100.

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

In this embodiment, the number of the supporting members 200 also includes a plurality, and the supporting members 200 correspond to the grooves 130 one by one.

Specifically, the number of the grooves 130 and the supporting members 200 is six, the six grooves 130 and the supporting members 200 are circumferentially distributed, and any two adjacent grooves 130 and the central angle of the winding pin assembly 100 are 60 °, so that the grooves 130 and the supporting members 200 are uniformly distributed on the winding surface 120, and therefore, when a plurality of supporting members 200 are simultaneously supported on the battery cell, the stress on the battery cell is uniform, and the purpose of effectively releasing the stress is achieved.

Further, the needle winding assembly 100 includes a first needle body 140 and a second needle body 150, and the first needle body 140 and the second needle body 150 are each semicircular in cross section.

In the present embodiment, the first needle body 140 and the second needle body 150 can be spliced to make the cross section of the needle winding assembly 100 circular, i.e. the winding surface 120 is cylindrical. The first needle body 140 and the second needle body 150 are made of ceramic or stainless steel plated ceramic, and the battery cell is wound through the first needle body 140 and the second needle body 150, so that the battery cell can be wound to achieve ideal cylindricity and tightness.

Of course, the cross section and the material of the first needle body 140 and the second needle body 150 may be other arrangements, and are not limited herein.

Further, the first needle 140 and the second needle 150 can move back and forth or toward each other, and the first needle 140 and the second needle 150 move toward each other to clamp the septum of the battery cell.

In this embodiment, the lithium battery winding mechanism 10 further includes a driving member (not shown), and the first needle 140 and/or the second needle 150 can be driven by the driving member to move, that is, the first needle 140 and the second needle 150 can be movable in both sides or in one side.

In practical application, before winding, the first needle body 140 and the second needle body 150 are moved back and forth by the driving member, the septum is placed between the first needle body 140 and the second needle body 150, and then the first needle body 140 and the second needle body 150 are moved towards each other by the driving member to clamp and fix the septum.

Further, the balloon 400 is disposed between the first needle 140 and the second needle 150, and is used for clamping a septum of the electrical core with the first needle 140 or the second needle 150 when the balloon 400 is inflated.

In this embodiment, the air bag 400 is disposed on the first needle 140 (or the second needle 150), and the air bag 400 is inflated under the condition that the first needle 140 and the second needle 150 clamp the membrane, so that the membrane is tightly fixed between the air bag 400 and the second needle 150 (or the first needle 140) under the extrusion of the air bag 400, and it is ensured that the membrane is not loosened relative to the first needle 140 and the second needle 150 when the winding needle assembly 100 winds, and the alignment degree with the pole piece is maintained, thereby preventing the membrane from wrinkling, deviating and the like, and affecting the winding effect of the battery cell.

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

In this embodiment, the pressure of the cylinder is controllable, and is controlled to be 0.1 MPa-0.2 MPa, so that the cylinder can be ensured to abut against the battery cell to release the stress between the pole piece and the diaphragm, and the battery cell can be prevented from being damaged due to excessive abutting force.

In summary, the present invention provides a method, in which the supporting member 200 disposed in the internal cavity 110 of the winding needle assembly 100 extends out of the winding surface 120 to support the winding battery core, so that the winding radius of the winding battery core is slightly larger than the radius of the winding needle assembly 100, and when the winding battery core is wound more and more tightly, the supporting member 200 retracts into the winding surface 120 to separate from the battery core, thereby releasing the stress of the pole piece and the diaphragm, preventing the internal deformation or distortion of the battery core in the subsequent processing process, and further improving the performance and safety of the battery core. Support through elastic block 300 and hold electric core, can play certain cushioning effect to under the more and more tight condition of electric core coiling, produce elastic deformation through elastic block 300, can further realize releasing the stress of pole piece and diaphragm, prevent the internal deformation or the distortion of electric core. Recess 130 can provide the accommodation space for the unloading clamping jaw in the unloading mechanism to the unloading clamping jaw can stretch into in recess 130 and take off the electric core from book needle subassembly 100 with the electric core after the centre gripping is convoluteed. The gasbag 400 sets up between first needle body 140 and second needle body 150, make gasbag 400 aerify under the condition of first needle body 140 and second needle body 150 centre gripping diaphragm, so that the diaphragm tightly fixes between gasbag 400 and second needle body 150 (or first needle body 140) under the extrusion of gasbag 400, in order to ensure that the diaphragm is relative first needle body 140 and second needle body 150 not hard up when rolling up needle subassembly 100 and coiling, and keep the alignment degree with the pole piece, prevent phenomenons such as the diaphragm is crumpled, the off tracking, influence the electric core and convolute the effect.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery winding mechanism is used for winding a battery cell and is characterized by comprising a winding needle assembly, a telescopic jacking piece and a fixing frame;

2. The lithium battery winding mechanism of claim 1, further comprising an elastic block, wherein the elastic block is disposed at one end of the battery core, which is abutted by the abutting member.

3. The lithium battery winding mechanism according to claim 2, wherein the elastic block protrudes from the winding surface by a distance of 0.1mm to 5 mm.

4. The lithium battery winding mechanism according to claim 1, wherein the winding surface is provided with a groove, and the through hole is provided in a bottom wall of the groove.

5. The lithium battery winding mechanism as claimed in claim 4, wherein the number of the grooves includes a plurality of grooves, and the plurality of grooves are equiangularly distributed on the winding surface.

6. The lithium battery winding mechanism according to claim 1, wherein the winding pin assembly includes a first pin body and a second pin body, and the first pin body and the second pin body each have a semicircular cross section.

7. The lithium battery winding mechanism according to claim 6, wherein the first needle body and the second needle body are movable back and forth or opposite to each other, and the first needle body and the second needle body move toward each other to clamp the separator of the battery cell.

8. The lithium battery winding mechanism according to claim 7, further comprising an air bag disposed between the first needle and the second needle for clamping a diaphragm of the battery cell with the first needle or the second needle when the air bag is inflated.

9. The lithium battery winding mechanism according to claim 1, wherein the supporting member is a cylinder having a pressure ranging from 0.1MPa to 0.2 MPa.

10. A winding device comprising the lithium battery winding mechanism according to any one of claims 1 to 9.