Battery cell winding tool

Abstract

The utility model provides a battery cell winding tool, the battery cell winding tool comprises a support and a rotary roller passing structure arranged on the support, the roller passing structure in the application comprises a roller body and a support part, the roller body is provided with a cavity, the peripheral surface of the roller body is provided with a liquid passing hole communicated with the cavity, and the liquid passing hole is communicated with the support part. The liquid passing hole is arranged towards a to-be-coated area of a winding core pole piece and / or a diaphragm, the supporting parts are arranged at two axial ends of the roller body, the supporting parts are provided with hollow structures communicated with the cavity, the hollow structures and the cavity are matched to form a channel for circulating an adhesive, and the roller passing structure rotates the adhesive to coat the to-be-coated area through the liquid passing hole. According to the battery core winding tool provided by the utility model, the structure of the channel for the adhesive to flow is adopted, so that the adhesive in the channel can be coated after overflowing through the liquid passing hole, and the strength of a pole piece is enhanced; therefore, the problems that in the prior art, the bent part of the pole piece at the R corner is easy to break and the diaphragm is wrinkled, and the operation is complicated, are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the related structure technical field of battery manufacturing, specifically, relate to a kind of battery cell winding tool. BACKGROUND

[0002] With the wide application of battery in mobile phone, computer, electric tool and power automobile and other fields, people's requirements for high energy density and high compaction of lithium electronic battery are also higher and higher.

[0003] At present, the battery core is mainly divided into winding core and laminated core, and the winding core is one of the main core structures. In the process of winding the core, the pole piece of the core forms a multi-turn structure. Therefore, the pole piece at the innermost R angle of the winding core is prone to breakage and diaphragm wrinkling at the bending part. In order to overcome the phenomenon that the pole piece at the innermost R angle is prone to breakage, the existing technology adopts the structure of sticking adhesive tape on the surface of the pole piece. When sticking the adhesive tape, the adhesive tape needs to be accurately adhered to the pole piece by manual or additional pressing mechanism, and the adhesive tape needs to be adhered first and then wound. The overall operation is complex, and the setting of the adhesive tape is prone to the problem of gap between the adhesive tape and the diaphragm.

[0004] As can be seen from the above, the means for solving the problem that the pole piece at the innermost R angle is prone to breakage and diaphragm wrinkling at the bending part in the prior art is complex in operation. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a kind of battery cell winding tool, to solve the problem that the means for solving the problem that the pole piece at the innermost R angle is prone to breakage and diaphragm wrinkling at the bending part in the prior art is complex in operation.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, a kind of battery cell winding tool is provided, and the battery cell winding tool includes support and over roller structure rotationally arranged on the support, the over roller structure includes roller body, the roller body has cavity, the outer circumferential surface of the roller body has over liquid hole communicated with the cavity, the over liquid hole is arranged towards the pole piece and / or diaphragm to be coated area of winding core;Support part, support part is arranged at the both ends of the axial direction of roller body, and support part has hollow structure communicated with cavity, and hollow structure and cavity cooperate to form channel for flowing adhesive, over roller structure rotates, and adhesive is coated on the pole piece and / or diaphragm to be coated area to form coating layer by over liquid hole, and after the pole piece and diaphragm are wound to form battery core, coating layer is located in the R angle area of battery core.

[0007] Further, the over roller structure further includes shielding piece, and the outer circumferential surface of the over roller structure is provided with shielding piece at both ends in the axial direction, and the shielding piece shields the over liquid hole at both ends of the over roller structure.

[0008] Further, the shielding piece is Teflon or adhesive tape.

[0009] Furthermore, the diameter of the roller body is larger than the diameter of the support portion; and / or the opening area of ​​the cavity is larger than the opening area of ​​the hollow structure.

[0010] Furthermore, the liquid passage hole is an elongated hole extending along the axial direction of the roller body. There is one or more elongated holes. When there are multiple elongated holes, they are spaced apart along the circumference of the roller body.

[0011] Furthermore, the cell winding fixture also includes an electrode unwinding roller mechanism, a diaphragm unwinding roller mechanism, and a winding needle: wherein the roller passing structure is located between the electrode unwinding roller mechanism and the winding needle, and / or the roller passing structure is located between the diaphragm unwinding roller mechanism and the winding needle.

[0012] Furthermore, the roller structure is retractably mounted on the support.

[0013] Furthermore, the roller passing structure is disposed on one side of the thickness direction of the electrode and / or diaphragm, or the roller passing structure is symmetrically disposed on both sides of the thickness direction of the electrode and / or diaphragm.

[0014] Furthermore, the cell winding fixture also includes a drive component, which is mounted on a support and is drivenly connected to at least one support portion. The drive component provides driving force for the rotation of the roller structure.

[0015] Furthermore, the cell winding fixture also includes a connecting pipe, which is connected to two supports and communicates with the channel. The connecting pipe is used for transporting the adhesive. The pump body is mounted on the support and communicates with the connecting pipe. The pump body provides driving force for the flow of adhesive inside the channel.

[0016] The present invention provides a battery cell winding fixture comprising a support and a roller structure rotatably mounted on the support. The roller structure comprises a roller body and a support portion. The roller body has a cavity, and the outer circumferential surface of the roller body has liquid passage holes communicating with the cavity. The liquid passage holes are positioned toward the coating area of ​​the electrode sheet and / or diaphragm of the core. The support portion is located at both ends of the roller body in the axial direction and has a hollow structure communicating with the cavity. The hollow structure and the cavity cooperate to form a channel for the flow of adhesive. The roller structure rotates the adhesive to coat the coating area of ​​the electrode sheet and / or diaphragm through the liquid passage holes to form a coating layer. After the electrode sheet and diaphragm are wound to form a battery cell, the coating layer is located in the R-corner area of ​​the battery cell.

[0017] As can be seen from the above, the roller structure of the cell winding fixture of this application uses an internal channel for the flow of adhesive. The adhesive overflows from the liquid passage hole to the coating area of ​​the electrode and / or separator through the roller structure to form a coating layer, thereby improving the strength of the electrode and / or separator. After coating, the final winding ensures that the coating layer of the coating area is located at the R-corner of the battery, reducing the occurrence of breakage at the R-corner. This application uses the method of overflowing adhesive while rotating the roller structure of the cell winding fixture to strengthen the R-corner of the cell, thereby preventing the electrode from breaking. The operation is simple and helps to improve the safety performance of the cell.

[0018] This application employs a roller-passing structure for adhesive coating. When the area to be coated on the electrode and / or diaphragm passes through the roller-passing structure, the structure extends from the support and coats the area to be coated, forming a coating layer. After coating is complete, the roller-passing structure retracts back onto the support, thus preventing coating from entering uncoated areas. This improves the precision and efficiency of adhesive coating.

[0019] This application uses an internal channel in the roller body for the adhesive to flow through, and the adhesive overflows through the liquid passage holes on the outer peripheral surface. The rotating roller structure can achieve uniform coating of the adhesive on the area to be coated on the electrode sheet and / or diaphragm, thereby improving the stability of the bonding.

[0020] This application uses an internally circulating adhesive within the channel. By circulating the adhesive within the channel, the phenomenon of adhesive solidification causing the roller structure to malfunction can be avoided.

[0021] The binder used in this application is a conventional binder used in lithium battery slurries. No new substances are introduced into the battery system to avoid side reactions. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 A side view of the roller structure of this utility model is shown;

[0024] Figure 2 A cross-sectional view of the roller structure of this utility model is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Roller body; 110. Liquid passage hole; 120. Cavity; 20. Support part; 210. Hollow structure; 30. Blocking part. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] To address the problem that existing methods for preventing electrode breakage at the R-angle bend are complex to operate, this embodiment provides a battery cell winding fixture.

[0031] Specifically, the battery cell winding fixture includes a support and a roller structure rotatably mounted on the support. The roller structure rotates to uniformly output and coat the adhesive inside the roller.

[0032] like Figure 1 and Figure 2 As shown, the roller structure includes a roller body 10 and a support portion 20. The roller body 10 has a cavity 120, and the outer peripheral surface of the roller body 10 has a liquid passage hole 110 communicating with the cavity 120. The liquid passage hole 110 is disposed towards the area to be coated of the electrode and / or diaphragm. The support portion 20 is disposed at both ends of the roller body 10 in the axial direction. The support portion 20 has a hollow structure 210 communicating with the cavity 120. The hollow structure 210 and the cavity 120 cooperate to form a channel for the flow of adhesive. After the roller structure rotates, the adhesive is coated on the area to be coated of the electrode and / or diaphragm through the liquid passage hole 110 to form a coating layer. After the electrode and diaphragm are wound to form a battery cell, the coating layer is located in the R-corner area of ​​the battery cell.

[0033] It is understandable that the electrode and separator are wound to form a multi-turn structure, and the wound cell is roughly elliptical in shape, with the R-angle being two opposite corners of the ellipse.

[0034] The adhesive can be a polymer PVDF, or other types of liquids with adhesive properties.

[0035] In this embodiment, the cell winding fixture further includes an electrode unwinding roller mechanism, a diaphragm unwinding roller mechanism, and a winding needle: wherein the roller passing structure is located between the electrode unwinding roller mechanism and the winding needle, and / or the roller passing structure is located between the diaphragm unwinding roller mechanism and the winding needle.

[0036] In this embodiment, the roller structure is retractably mounted on the support.

[0037] In this embodiment, during actual use, based on the design of the battery cell to be wound, the area to be coated can be first determined on the electrode and / or separator. Specifically, based on the electrode length and winding needle type of the battery cell to be processed, the roller structure is set at an appropriate position at a distance from the electrode unwinding roller mechanism and / or separator unwinding roller mechanism, so that when the electrode and / or separator reach the roller structure, the area to be coated is directly opposite the roller structure. After coating and winding, it is positioned at the radius (R) corner of the battery cell. Thus, after the unwinding roller mechanism begins unwinding, when the area to be coated on the electrode and / or separator passes the roller structure, the roller structure extends from the support and coats the area to be coated, forming a coating layer. After the roller structure has finished coating, it retracts back onto the support, thus avoiding coating onto uncoated areas. Simultaneously, the roller structure is rotated to improve the uniformity of coating, increasing the strength of the electrode and / or separator, preventing electrode breakage, and ensuring adhesion and fixation to the separator, improving the overall structural stability.

[0038] In this embodiment, the cell winding fixture of this application uses an internal channel for adhesive flow in its roller structure. By rotating the roller structure, the adhesive overflows from the liquid passage hole 110 onto the surface of the electrode and / or separator, thereby increasing the strength of the area to be coated on the electrode and / or separator. After coating, the final winding ensures that the coating layer in the area to be coated is located at the R-corner of the battery, reducing the possibility of breakage at the R-corner. This application uses the method of simultaneously rotating the roller structure of the cell winding fixture and overflowing the adhesive to strengthen the R-corner of the cell, thereby preventing electrode breakage. The operation is simple and helps improve the safety performance of the cell.

[0039] In some embodiments, the coating area of ​​the electrode and / or separator is located in the innermost radius (R-corner) region of the battery cell; that is, the roll-over structure only coats the electrode and / or separator located in the innermost radius (R-corner) region of the battery cell. It is understood that, compared to the outer radius, the innermost radius (R-corner) region of the battery cell is more prone to electrode breakage at bends and separator wrinkling. Therefore, coating can be performed only in the innermost radius (R-corner) region of the battery cell.

[0040] In this embodiment, the support part 20 is used to install the roller structure. The support part 20 is also used to connect to the external adhesive supply device to realize the delivery of adhesive.

[0041] Specifically, the battery cell winding fixture also includes a connecting pipe and a pump body. The connecting pipe is connected to two support parts 20 respectively and communicates with the channel. The connecting pipe is used for transporting the adhesive. The pump body is mounted on the bracket and communicates with the connecting pipe. The pump body provides driving force for the flow of adhesive inside the channel.

[0042] The adhesive inside the two support sections 20 and the connecting pipes circulates under the drive of the pump body. One connecting pipe is used for the output of the adhesive supply device, and the other connecting pipe is used for the return of the adhesive supply device, thereby achieving the formation of a flowing state of the adhesive.

[0043] In this embodiment, the present application employs an internally flowing adhesive channel. By allowing the adhesive to flow within the channel, the phenomenon of adhesive solidification causing the roller structure to malfunction can be avoided. The use of an internal channel within the roller structure to allow the adhesive to flow helps maintain its liquid state. Compared to applying adhesive to the outer surface of the roller structure, the adhesive in this application allows for repeated use of the roller structure, which is beneficial for improving the production efficiency of battery cells.

[0044] like Figure 1 As shown, the roller structure also includes a blocking member 30. The two ends of the outer peripheral surface of the roller structure are provided with blocking members 30, which block the liquid passage holes 110 at both ends of the roller structure.

[0045] Specifically, the shielding member 30 is provided at both ends on the axial direction of the outer peripheral surface of the roller structure to adjust the area of ​​adhesive overflow, so as to be suitable for electrodes and diaphragms of different widths.

[0046] Understandably, when the size of the electrode is large enough, no shielding element 30 is provided on the roller body 10 of the roller structure to improve coating efficiency.

[0047] In this embodiment, the shielding range of the shielding member 30 can be adjusted as needed, that is, the area of ​​the liquid passage 110 can be adaptively shielded according to the size of the electrode to ensure that the unshielded liquid passage 110 is suitable for the electrode and the diaphragm.

[0048] The shielding component 30 can be a structural component such as Teflon or tape, which is used to shield the liquid passage 110 by wrapping and bonding. The size of the area of ​​the unshielded liquid passage 110 is controlled by the area of ​​wrapping.

[0049] like Figure 1 and Figure 2As shown, the diameter of the roller body 10 is larger than the diameter of the support portion 20, and the cross-sectional area of ​​the cavity 120 is larger than the cross-sectional area of ​​the hollow structure 210, so that the cavity 120 has a larger liquid storage space, thereby storing more adhesive and facilitating overflow. At the same time, the larger liquid storage space in the cavity 120 ensures that the adhesive flow, sequentially passing through the hollow structure 210, the cavity 120, and the hollow structure 210 during its flow process, does not affect the uniform overflow within the cavity 120.

[0050] In this embodiment, different implementation methods are provided based on the structure of the liquid passage 110.

[0051] In a specific embodiment not shown, the liquid passage 110 is an elongated hole arranged along the axial direction of the roller body 10. The elongated hole structure of the liquid passage 110 is beneficial to improving the smoothness of adhesive overflow.

[0052] Specifically, there may be one elongated hole or multiple elongated holes. When there are multiple elongated holes, they are spaced apart circumferentially along the roller body 10 so that adhesive can overflow from all the elongated holes when the roller structure rotates, thereby improving the coating efficiency.

[0053] In such Figure 1 and Figure 2 In the specific embodiment shown, multiple liquid passage holes 110 are provided at intervals along the circumference and axial direction of the roller body 10, and the multiple liquid passage holes 110 are formed into a mesh structure.

[0054] The liquid passage holes 110 in the mesh structure help ensure the uniformity of the overflow adhesive at various positions of the roller structure.

[0055] Specifically, the opening of the liquid passage 110 is one or a combination of circular, elliptical, and polygonal shapes. For example, multiple liquid passages 110 may include liquid passages 110 with circular and elliptical openings, liquid passages 110 with circular and polygonal openings, liquid passages 110 with elliptical and polygonal openings, and liquid passages 110 with circular, elliptical, and polygonal openings.

[0056] In this embodiment, the roller structure can be disposed on one side of the electrode sheet and / or the diaphragm in the thickness direction, or it can be disposed on both sides.

[0057] When the roller structure is located on one side of the thickness direction of the electrode and / or diaphragm, the roller structure can extend from the support and contact the electrode and / or diaphragm, and apply the adhesive to one side by rotating.

[0058] Specifically, there is one roller structure, which enables the adhesive to be coated on one side.

[0059] When the roller structure is set on both sides of the thickness direction of the electrode and / or diaphragm, the roller structure on both sides clamps the electrode and / or diaphragm and applies the adhesive to both sides by rotating.

[0060] Specifically, there are two roller structures, which are sandwiched on both sides of the electrode and / or diaphragm, and the adhesive is applied to both sides by rotation.

[0061] In this embodiment, to ensure the uniformity of adhesive coating, the roller structure needs to be rotated. That is, after the roller body 10 contacts the electrode and the diaphragm, the roller structure rotates at least one revolution, thereby achieving the effect of uniform coating after the adhesive overflows.

[0062] Specifically, depending on the different rotation forms of the roller structure, the following implementation methods are provided in this embodiment.

[0063] In one specific embodiment, the cell winding fixture also includes a drive member, which is mounted on a support and is drivenly connected to at least one support 20. The drive member provides driving force for the rotation of the roller structure.

[0064] The roller structure is driven to rotate by a drive component, which can be a rotary motor or a rotary cylinder. Using a drive component to drive the roller structure to rotate helps ensure that the roller structure rotates at a constant speed, thereby improving the uniformity of adhesive coating.

[0065] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0066] The cell winding fixture of this application employs an internal channel for adhesive flow in its roller structure. This allows the adhesive to overflow from the liquid passage 110 into the coating area of ​​the electrode and / or separator, thereby increasing the strength of the coating area. After coating, a final winding ensures the coating layer is located at the R-corner of the battery, reducing the risk of breakage at the R-corner. This application strengthens the R-corner of the cell by using the simultaneous rotation of the roller structure and the overflow of adhesive, thus preventing electrode breakage. The operation is simple and improves cell production efficiency.

[0067] The adhesive coating using the roller structure employed in this application can be carried out during the electrode winding process, thereby improving the production efficiency of the battery cell.

[0068] This application uses an internal channel of the roller body 10 to accommodate the adhesive for flow, and the adhesive overflows through the liquid passage hole 110 on the outer peripheral surface. The rotating setting of the roller structure can achieve uniform coating of the adhesive on the area to be coated of the electrode sheet and / or diaphragm, thereby improving the stability of the bonding.

[0069] This application uses an internally circulating adhesive within the channel. By circulating the adhesive within the channel, the phenomenon of adhesive solidification causing the roller structure to malfunction can be avoided.

[0070] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0071] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0072] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell winding fixture, characterized in that, The system includes a support and a roller structure rotatably mounted on the support, the roller structure comprising: Roller body (10) having a cavity (120) and a liquid passage hole (110) communicating with the cavity (120) on the outer peripheral surface of the roller body (10), the liquid passage hole (110) being disposed toward the area to be coated of the electrode and / or diaphragm; A support portion (20) is disposed at both ends of the roller body (10) along the axial direction. The support portion (20) has a hollow structure (210) communicating with the cavity (120). The hollow structure (210) and the cavity (120) cooperate to form a channel for the flow of adhesive. The roller structure rotates and the adhesive is coated on the area to be coated of the electrode and / or the diaphragm through the liquid passage (110) to form a coating layer. After the electrode and the diaphragm are wound to form a battery cell, the coating layer is located in the R-corner area of ​​the battery cell.

2. The battery cell winding fixture according to claim 1, characterized in that, The roller passing structure also includes a blocking member (30), which is provided at both ends of the outer peripheral surface of the roller passing structure in the axial direction. The blocking member (30) blocks the liquid passing holes (110) at both ends of the roller passing structure.

3. The battery cell winding fixture according to claim 2, characterized in that, The shielding element (30) is Teflon or tape.

4. The battery cell winding fixture according to claim 1, characterized in that, The diameter of the roller body (10) is larger than the diameter of the support portion (20); and / or The opening area of ​​the cavity (120) is larger than the opening area of ​​the hollow structure (210).

5. The cell winding fixture according to claim 1, characterized in that, The liquid passage (110) is an elongated hole extending axially along the roller body (10). The elongated holes are provided in one or more ways. When there are multiple elongated holes, the multiple elongated holes are arranged at intervals along the circumference of the roller body (10).

6. The cell winding fixture according to claim 1, characterized in that, The battery cell winding fixture also includes an electrode unwinding roller mechanism, a diaphragm unwinding roller mechanism, and a winding needle. The roller structure is located between the electrode unwinding roller mechanism and the winding needle, and / or The roller structure is located between the diaphragm unwinding roller mechanism and the winding needle.

7. The battery cell winding fixture according to claim 1, characterized in that, The roller structure is retractably mounted on the support.

8. The battery cell winding fixture according to claim 1, characterized in that, The roller structure is disposed on one side of the electrode sheet and / or the diaphragm in the thickness direction; or The roller structure is symmetrically arranged on both sides of the electrode sheet and / or the diaphragm in the thickness direction.

9. The battery cell winding fixture according to any one of claims 1 to 8, characterized in that, The battery cell winding fixture also includes: A driving member is disposed on the bracket and is drivenly connected to at least one of the support portions (20), the driving member providing driving force for the rotation of the roller structure.

10. The battery cell winding fixture according to any one of claims 1 to 8, characterized in that, The battery cell winding fixture also includes; A connecting pipe, which is connected to the two support parts (20) respectively and communicates with the channel, is used for transporting adhesive; A pump body is mounted on the bracket and communicates with the connecting pipe. The pump body provides driving force for the flow of adhesive inside the channel.

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