Winding needle assembly and battery cell winding system
By designing a needle reel assembly with adjustable perimeter, the problem of difficult control of the alignment of the extreme ear during the reel of the lithium-ion battery is solved, effectively aligning the extreme ears is achieved, and the production efficiency and pole sheet of the battery cell winding system are improved. Utilization.
Patent Information
- Application Number
- CN202420414615.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-04
AI Technical Summary
During the winding process of lithium-ion batteries, especially when the number of windings of 280Ah products is large, the alignment of the extreme ears is difficult to control. Due to the uniformity of the polar sheet thickness, uniformity of the diaphragm thickness and tension changes, the extreme ear dislocation is severe.
A needle roll assembly is designed, including a needle roll body, mounting slot, telescopic assembly and needle roll housing. The telescopic assembly is adjusted by a pneumatic cylinder or hydraulic cylinder, changing the perimeter of the needle assembly to adapt to the thickness changes of the pole sheet and the diaphragm, so that the pole ears are aligned.
By adjusting the perimeter of the needle assembly, the problem of polar ear dislocation can be effectively solved, ensuring the alignment of the polar ears, and improving the production continuity of the battery cell winding system and the utilization rate of the polar sheet.
Smart Images
Figure CN222530487U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery core production equipment, in particular to a winding needle assembly and a battery core winding system. Background Art
[0002] In the preparation process of lithium-ion batteries, there is a process called winding to assemble the positive and negative electrodes of the battery cell. Winding is to fit the positive electrode, separator and negative electrode together to form a battery cell. In the winding process of lithium-ion batteries, especially the current 280Ah products with many winding turns, the alignment of the pole tabs is a key control point, and is affected by factors such as the uniformity of the thickness of the pole sheet, the uniformity of the thickness of the separator, and the tension control. For winding cores with many winding turns, the thickness of the winding core increases continuously during the winding process, that is, the circumference of the winding needle increases continuously, and the tension is constantly changing, and the misalignment of the pole tabs becomes more serious. Utility Model Content
[0003] The utility model aims to provide a winding needle assembly and a battery cell winding system to alleviate the technical problem of serious misalignment of the pole ears on the winding core due to the influence of the thickness uniformity of the pole piece during the winding process.
[0004] The utility model provides a needle winding assembly, comprising a needle winding body, mounting grooves are arranged on two symmetrical sides of the needle winding body, and telescopic assemblies are arranged in the mounting grooves;
[0005] One end of the telescopic component is arranged in the installation groove, and the other end extends out of the installation groove; a winding needle housing is arranged at one end of the telescopic component away from the winding needle body.
[0006] In an optional embodiment, the winding needle housing is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the telescopic assembly.
[0007] In an optional embodiment, the telescopic assembly includes two telescopic parts, and the telescopic parts are pneumatic cylinders or hydraulic cylinders.
[0008] In an optional embodiment, at least two assembly holes are provided through the length direction of the winding needle body, and the assembly holes are used to assemble the winding needle body to the winding machine.
[0009] In an optional embodiment, at least two outer grooves are evenly arranged around the circumference of the winding needle body.
[0010] In an optional embodiment, a belt threading hole is provided on the winding needle body.
[0011] The winding needle assembly provided by the utility model is provided with a telescopic assembly, and the two telescopic assemblies can adjust the distance between the two winding needle shells, thereby changing the circumference of the entire winding needle assembly, so that it can be adjusted according to the thickness of the pole piece and the isolation membrane to align the pole ears on the winding core.
[0012] The utility model provides a battery core winding system, comprising a winding needle assembly as described in any one of the aforementioned implementation modes.
[0013] In an optional embodiment, the battery cell winding system further includes a positive electrode unwinding system, a positive electrode thickness measurement and identification component, a positive electrode tension control system, a negative electrode unwinding system, a negative electrode thickness measurement and identification component and a negative electrode tension control system;
[0014] The positive electrode sheet on the positive electrode unwinding system is connected to the winding needle assembly after passing through the positive electrode thickness measurement and identification assembly and the positive electrode tension control system in sequence;
[0015] The negative electrode sheet on the negative electrode unwinding system is connected to the winding needle assembly after passing through the negative electrode thickness measurement and identification assembly and the negative electrode tension control system in sequence.
[0016] In an optional embodiment, the positive electrode thickness measurement and identification component and the negative electrode thickness measurement and identification component both include a thickness gauge and a mark hole identification instrument.
[0017] In an optional embodiment, it further includes an isolation film unwinding mechanism, and the isolation film on the isolation film unwinding mechanism is connected to the winding needle assembly.
[0018] Compared with the prior art, the battery core winding system provided by the utility model has the winding needle assembly provided by the utility model, and thus has all the beneficial effects of the winding needle assembly provided by the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A schematic diagram of the structure of a needle winding assembly provided in an embodiment of the utility model;
[0021] Figure 2 for Figure 1 A schematic structural diagram of the winding needle assembly from another angle shown;
[0022] Figure 3 for Figure 1 A schematic structural diagram of the winding needle assembly at another angle shown;
[0023] Figure 4 A schematic structural diagram of a battery cell winding system provided in an embodiment of the utility model.
[0024] Icons: 100-winding needle body; 200-assembly hole; 300-winding needle shell; 400-telescopic component; 500-installation slot; 600-belt threading hole; 700-positive electrode unwinding system; 800-positive electrode thickness measurement and identification component; 900-positive electrode tension control system; 110-negative electrode unwinding system; 120-negative electrode thickness measurement and identification component; 130-negative electrode tension control system. DETAILED DESCRIPTION
[0025] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.
[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0027] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.
[0028] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, 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, and it can be the internal connection of two elements.
[0029] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.
[0030] Example
[0031] Reference Figure 1-Figure 3 The utility model provides a needle winding assembly, including a needle winding body 100, wherein mounting grooves 500 are arranged on two symmetrical sides of the needle winding body 100, and a telescopic assembly 400 is arranged in the mounting groove 500;
[0032] One end of the telescopic assembly 400 is disposed in the mounting groove 500 , and the other end extends out of the mounting groove 500 ; a winding needle housing 300 is disposed at one end of the telescopic assembly 400 away from the winding needle body 100 .
[0033] In some embodiments, two mounting grooves 500 are provided on the winding needle body 100 of the winding needle assembly, and the two mounting grooves 500 are symmetrically arranged on both sides of the winding needle body 100; a telescopic assembly 400 is arranged in the mounting groove 500, one end of the telescopic assembly 400 is fixed in the mounting groove 500, and the other end is arranged in the winding needle housing 300.
[0034] The telescopic assembly 400 may also be directly disposed on the winding needle body 100. Since the telescopic assembly 400 has a certain length, when the telescopic assembly 400 is directly disposed on the winding needle body 100, the distance between the winding needle housing 300 and the winding needle body 100 becomes larger, resulting in a larger circumference of the winding needle assembly.
[0035] The telescopic component 400 is arranged in the installation groove 500, and part of the telescopic component 400 can be accommodated in the installation groove 500, so that the distance between the winding needle shell 300 and the winding needle body 100 is shorter than the distance between the telescopic component 400 and the winding needle body 100 when the telescopic component 400 is arranged on the winding needle body 100. Similarly, the minimum value of the circumference adjustment range of the winding needle assembly in the solution where the telescopic component 400 is arranged on the winding needle body 100 is larger than the minimum value of the circumference adjustment range of the winding needle assembly in the solution where the telescopic component 400 is arranged on the winding needle body 100. Similarly, the maximum value of the circumference adjustment range of the winding needle assembly in the solution where the telescopic component 400 is arranged on the winding needle body 100 is larger than the maximum value of the circumference adjustment range of the winding core assembly in the solution where the telescopic component 400 is arranged in the installation groove 500.
[0036] In an optional embodiment, the winding needle housing 300 is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the telescopic assembly 400 .
[0037] In some embodiments, the winding needle housing 300 is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the telescopic assembly 400; the two arc-shaped plates cooperate to adjust the circumference of the entire winding needle assembly, so that the circumference of the winding needle assembly can be improved according to the changes in the thickness of the pole ear and the changes in the thickness of the diaphragm, thereby solving the problem of the pole ear being unable to be aligned due to the change in the thickness of the pole piece.
[0038] In an optional embodiment, the telescopic assembly 400 includes two telescopic parts, and the telescopic parts are pneumatic cylinders or hydraulic cylinders.
[0039] In some embodiments, the telescopic assembly 400 includes two telescopic parts, so that the winding needle housing 300 can move smoothly. The telescopic assembly 400 can also be provided with more telescopic parts according to actual needs; the telescopic parts can be pneumatic cylinders or hydraulic cylinders.
[0040] In an optional embodiment, at least two assembly holes 200 are provided through the length direction of the winding needle body 100, and the assembly holes 200 are used to assemble the winding needle body 100 to a winding machine.
[0041] Two, three or more assembly holes 200 are provided on the winding needle body 100 , and the winding needle body 100 is assembled to the winding machine through the assembly holes 200 . The winding machine can rotate the winding needle body 100 . Generally, four assembly holes 200 are provided on the winding needle body 100 .
[0042] In an optional embodiment, at least two outer grooves are evenly arranged around the circumference of the winding needle body 100 .
[0043] In order to facilitate the removal of the winding core on the winding needle assembly, an outer groove is provided on the winding needle body 100. A tool is inserted into the outer groove, and the winding core is removed from the winding needle body 100 using the tool. Generally, the winding core shell is contracted using the telescopic assembly 400, and then the winding core is removed using the tool. The tool is generally rod-shaped.
[0044] In an optional embodiment, a belt threading hole 600 is provided on the winding needle body 100 .
[0045] A tape hole 600 is provided on the winding needle body 100. The isolation film is first inserted into the tape hole 600. After the winding needle body 100 rotates, the positive electrode sheet and the negative electrode sheet are placed on both sides of the isolation film, so that the positive electrode sheet, the isolation film and the negative electrode sheet are wound on the winding needle body 100 to realize the winding core.
[0046] The winding needle assembly provided by the utility model is provided with a telescopic assembly 400, and the two telescopic assemblies 400 can adjust the distance between the two winding needle shells 300, thereby changing the circumference of the entire winding needle assembly, so that it can be adjusted according to the thickness of the pole piece and the isolation membrane to align the pole ears on the winding core.
[0047] Reference Figure 4 The utility model provides a battery core winding system, comprising a winding needle assembly as described in any one of the aforementioned embodiments.
[0048] In an optional embodiment, the battery cell winding system further includes a positive electrode unwinding system 700, a positive electrode thickness measurement and identification component 800, a positive electrode tension control system 900, a negative electrode unwinding system 110, a negative electrode thickness measurement and identification component 120 and a negative electrode tension control system 130;
[0049] The positive electrode sheet on the positive electrode unwinding system 700 passes through the positive electrode thickness measurement and identification component 800 and the positive electrode tension control system 900 in sequence and then is connected to the winding needle component;
[0050] The negative electrode sheet on the negative electrode unwinding system 110 passes through the negative electrode thickness measurement and identification component 120 and the negative electrode tension control system 130 in sequence and then is connected to the winding needle component.
[0051] In an optional embodiment, the positive electrode thickness measurement and identification component 800 and the negative electrode thickness measurement and identification component 120 both include a thickness gauge and a mark hole identification instrument.
[0052] In an optional embodiment, it further includes an isolation film unwinding mechanism, and the isolation film on the isolation film unwinding mechanism is connected to the winding needle assembly.
[0053] The thickness of the isolation membrane, positive electrode sheet and negative electrode sheet can be measured in real time. After the winding needle assembly completes a winding core, the winding needle assembly is adjusted according to the thickness of the isolation membrane, positive electrode sheet and negative electrode sheet, so that each winding core of the winding needle assembly is adjusted according to the latest data of the isolation membrane, positive electrode sheet and negative electrode sheet, thereby ensuring the alignment of the pole ears on the winding core; in this way, the alignment of the pole ears of the winding core can be adjusted online, ensuring the continuity of production, and at the same time improving the utilization rate of the pole sheets.
[0054] Generally, a battery cell winding system includes multiple winding needle assemblies, which wind the core in turn to ensure the continuity of the core and provide enough time to remove the core from the winding needle assembly.
[0055] Compared with the prior art, the battery core winding system provided by the utility model has the winding needle assembly provided by the utility model, and thus has all the beneficial effects of the winding needle assembly provided by the utility model.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than alignment limitations; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features in the alignment with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A needle winding assembly, characterized in that: It comprises a needle winding body (100), mounting grooves (500) are arranged on two symmetrical sides of the needle winding body (100), and a telescopic assembly (400) is arranged in the mounting groove (500); One end of the telescopic component (400) is arranged in the mounting groove (500), and the other end extends outside the mounting groove (500); a winding needle housing (300) is arranged at the end of the telescopic component (400) away from the winding needle body (100).
2. The needle winding assembly according to claim 1, characterized in that: The winding needle housing (300) is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the telescopic assembly (400).
3. The needle winding assembly according to claim 1, characterized in that: The telescopic assembly (400) comprises two telescopic parts, and the telescopic parts are pneumatic cylinders or hydraulic cylinders.
4. The needle winding assembly according to claim 1, characterized in that: At least two assembly holes (200) are provided through the winding needle body (100) in the length direction, and the assembly holes (200) are used to assemble the winding needle body (100) onto a winding machine.
5. The needle winding assembly according to claim 1, characterized in that: At least two outer grooves are evenly arranged in the circumference of the winding needle body (100).
6. The needle winding assembly according to claim 1, characterized in that: The winding needle body (100) is provided with a belt threading hole (600).
7. A battery cell winding system, characterized in that: The invention comprises the winding needle assembly as described in any one of claims 1 to 6.
8. The battery cell winding system according to claim 7, characterized in that: The battery cell winding system further comprises a positive electrode unwinding system (700), a positive electrode thickness measurement and identification component (800), a positive electrode tension control system (900), a negative electrode unwinding system (110), a negative electrode thickness measurement and identification component (120) and a negative electrode tension control system (130); The positive electrode sheet on the positive electrode unwinding system (700) passes through the positive electrode thickness measurement and identification component (800) and the positive electrode tension control system (900) in sequence and is then connected to the winding needle component; The negative electrode sheet on the negative electrode unwinding system (110) passes through the negative electrode thickness measurement and identification component (120) and the negative electrode tension control system (130) in sequence and is then connected to the winding needle component.
9. The battery cell winding system according to claim 8, characterized in that: The positive electrode thickness measurement and identification component (800) and the negative electrode thickness measurement and identification component (120) both comprise a thickness gauge and a mark hole identification instrument.
10. The battery core winding system according to claim 8, characterized in that: It also includes an isolation film unwinding mechanism, and the isolation film on the isolation film unwinding mechanism is connected to the winding needle assembly.