Equipment for making composite rolls for lamination and adhesive bonding, and production method of such composite rolls

Abstract

This invention relates to a composite roll forming equipment and a method for producing the composite roll after lamination and adhesive bonding. The equipment includes an unwinding assembly, a deviation correction assembly, a tension control assembly, a follow-up cutting assembly, a diaphragm unwinding assembly, a lamination assembly, an adhesive bonding assembly, a detection assembly, and a rewinding assembly. The unwinding assembly unwinds the roll, the follow-up cutting assembly cuts the roll and transfers it to the lamination assembly, the diaphragm is unwound from the diaphragm unwinding assembly to the lamination assembly, the lamination assembly laminates the diaphragm to the roll to form a composite roll, the adhesive bonding assembly applies adhesive paper to the diaphragm of the composite roll, the detection assembly detects the composite roll, and the rewinding assembly rewinds it. This lamination method ensures continuous or intermittent lamination of the roll, improving lamination efficiency. The composite diaphragm strengthens the rigidity of the roll, preventing deviation and wrinkling during winding. Applying adhesive paper only at the locations where two diaphragm layers are laminated on the composite roll avoids diaphragm stretching deformation due to excessive tension.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, and in particular to a composite roll forming equipment for laminating adhesive and a method for producing the composite roll. Background Technology

[0002] Lithium-ion batteries have become a favorite in the energy industry due to their high energy density, good cycle performance, long lifespan, safety, environmental friendliness, and lack of memory effect. Today, lithium-ion batteries have been successfully applied in portable electronic products, electric vehicles, and aerospace, becoming a research hotspot in new energy materials. Lithium-ion batteries come in both wound and stacked structures.

[0003] The core of a wound battery cell is typically formed by winding the positive and negative electrode sheets, which have already been shaped with tabs, together with a separator using a winding machine. The current problem is that after winding a cell, the electrode sheets need to be cut. However, cutting the electrode sheets creates burrs, which can puncture the separator, causing a short circuit in the cell. Furthermore, the separator may wrinkle after lamination, all of which affect the quality of the battery cell. Summary of the Invention

[0004] The main objective of this invention is to provide a composite material roll forming equipment and a method for producing the composite material roll after lamination and adhesive bonding, so as to solve the above-mentioned technical problems and improve the quality of battery cells.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A composite roll forming device for lamination and subsequent adhesive bonding includes an unwinding assembly, a web guiding assembly, a tension control assembly, a follow-up cutting assembly, a diaphragm unwinding assembly, a lamination assembly, an adhesive bonding assembly, a detection assembly, and a composite roll rewinding assembly. The unwinding assembly unwinds the roll, which is then sequentially moved to the web guiding assembly, the tension control assembly, and the follow-up cutting assembly. The follow-up cutting assembly cuts the roll and transfers it to the lamination assembly. A diaphragm is unwound from the diaphragm unwinding assembly and placed at both ends of the roll. The lamination assembly laminates the diaphragm to both ends of the roll to form a composite roll. The adhesive bonding assembly applies adhesive paper between every two sections of the roll on the diaphragm of the composite roll. The composite roll is detected by the detection assembly and finally rewound by the composite roll rewinding assembly.

[0007] As a preferred technical solution, the unwinding assembly includes an unwinding structure, an unwinding buffer structure, and a brush dust removal structure. The unwinding structure unwinds the material roll, and the material roll is transmitted through the unwinding buffer structure to the brush dust removal structure for surface cleaning and dust removal of the material roll.

[0008] As a preferred technical solution, the tension control component includes a tension control structure, a tension sensor, and a roll length measuring structure. The roll length measuring structure detects the position of the roll, the tension sensor senses the tension of the roll, and the tension control structure adjusts the tension of the roll.

[0009] As a preferred technical solution, the tracking and cutting component includes a clamping and correction structure and a roll cutting structure. The clamping and correction structure clamps the roll, the roll cutting structure cuts the roll, and the clamping and correction structure moves the cut end of the roll onto the composite component.

[0010] As a preferred technical solution, the diaphragm unwinding assembly includes a diaphragm unwinding structure and a diaphragm tension control structure. The diaphragm is unwound through the diaphragm unwinding structure and then transmitted to both sides of the roll through the diaphragm tension control structure.

[0011] As a preferred technical solution, the composite component includes a membrane-coated structure, a preheating structure, and a composite structure. The membrane-coated structure presses the diaphragm onto both sides of the roll, the preheating structure preheats the diaphragm, and the composite structure combines the roll and the diaphragm to form a composite roll.

[0012] As a preferred technical solution, the composite structure includes an electromagnetic heating shaft, a main drive motor, a dust removal scraper, and a wiping roller. The main drive motor drives the electromagnetic heating shaft to rotate, and the material roll and the diaphragm pass between the two electromagnetic heating shafts to form a composite material roll. The dust removal scraper and the wiping roller remove dust from the electromagnetic heating shaft.

[0013] As a preferred technical solution, the detection component includes a first detection structure, a second detection structure, and a labeling machine. The first detection structure detects one side of the composite material roll, the second detection structure detects the other side of the composite material roll, and the labeling machine labels the defective products detected by the first detection structure and the second detection structure.

[0014] As a preferred technical solution, the composite material roll winding assembly includes a winding tension control structure, a web correction sensor, a winding correction structure, a winding structure, and a winding pressure roller. The composite material roll is transmitted to the winding correction structure after passing through the winding tension control structure. The web correction sensor aligns the roll, and the winding structure winds the composite material roll. The winding pressure roller presses the composite material roll onto the winding structure.

[0015] In another embodiment of the present invention, a method for producing composite material rolls includes the following steps:

[0016] S1. Unwind the material roll, buffer the material roll, and remove dust from both ends of the material roll;

[0017] S2. Correct the deviation of the material roll and move the material roll accordingly;

[0018] S3. Detect and adjust the tension of the coil to maintain a constant value;

[0019] S4. Measure the length of the material roll and determine its position;

[0020] S5. Cut the material roll using a follow-cutting method and move the cut end of the material roll to the pre-compression position;

[0021] S6. Unwind the diaphragm, check and adjust the diaphragm tension to keep it constant;

[0022] S7. Measure the diaphragm length and determine the diaphragm position;

[0023] S8. After the diaphragm in step S7 is pre-pressed to both sides of the roll in step S5 and preheated, it is rolled and laminated to form a composite roll.

[0024] S9. Apply adhesive paper to one or both ends of the composite roll where only two layers of diaphragm are laminated.

[0025] S10. Inspect both ends of the composite material roll and label any substandard composite material rolls.

[0026] S11. Adjust the tension of the composite material roll and rewind the composite material roll.

[0027] The beneficial effects of this invention are as follows: the composite roll forming equipment and the production method of the composite roll after lamination and adhesive application ensure that the roll can be continuously or intermittently laminated during lamination, ensuring that lamination will not be stopped due to the need to cut the roll, thus improving lamination efficiency. The composite diaphragm strengthens the rigidity of the roll, making it less prone to deviation and preventing wrinkling during winding. Adhesive paper is applied to one or two end faces between every two roll segments on the diaphragm of the composite roll, i.e., adhesive paper is applied to the position where only two layers of diaphragm are laminated on the composite roll. This can prevent stretching deformation at the position where only two layers of diaphragm are laminated due to excessive tension during the transmission of the composite roll, preventing the roll ends from not rolling up. The battery cell formed by winding the composite roll can ensure that no powder falls off at the corners of the battery cell, improve the uniformity of the positive and negative electrode heads, improve the quality of the battery cell, and ensure that there is a certain length of diaphragm between the two rolls to ensure the normal operation of the subsequent winding process. Moreover, the adhesive application component uses a follow-up application method to apply adhesive paper, thereby achieving adhesive application without stopping the machine, improving lamination efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the composite roll sheet making equipment for laminating adhesive after lamination, which is involved in the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the composite material roll involved in the present invention;

[0030] Figure 3 This is a process flow diagram of the composite material roll involved in the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] Please combine Figure 1 and Figure 2 As shown, a composite roll forming device for laminating and then applying adhesive includes an unwinding assembly 1, a web guiding assembly 2, a tension control assembly 3, a follow-up cutting assembly 4, a first diaphragm unwinding assembly 5, a second diaphragm unwinding assembly 6, a laminating assembly 7, an adhesive application assembly 8, a detection assembly 9, and a composite roll take-up assembly 10. The unwinding assembly 1 unwinds the roll a, which then moves sequentially to the web guiding assembly 2, the tension control assembly 3, and the follow-up cutting assembly 4. The follow-up cutting assembly 4 cuts the roll a and transfers it to the laminating assembly. On 7, diaphragm b is unwound from the first diaphragm unwinding assembly 5 and the second diaphragm unwinding assembly 6 to the composite assembly 7, and is placed at both ends of the material roll a. The composite assembly 7 laminates diaphragm b to both ends of the material roll a to form a composite material roll. The adhesive application assembly 8 applies adhesive paper c to one or both end faces of the diaphragm b of the composite material roll between every two sections of the material roll. The composite material roll is detected by the detection assembly 9, and finally wound up by the composite material roll rewinding assembly 10. This composite method ensures that the material roll a can be continuously laminated during the lamination process. Alternatively, intermittent lamination can be used to ensure that lamination does not stop when the material roll a needs to be cut, thereby improving lamination efficiency. The rigidity of the material roll a is strengthened by the composite diaphragm b, making it less prone to deviation and preventing wrinkling during winding. Adhesive paper c is attached to one or two end faces of the diaphragm b between every two sections of the composite material roll, that is, adhesive paper c is attached to the position where only two layers of diaphragm b are laminated on the composite material roll. This can prevent stretching deformation at the position where only two layers of diaphragm b are laminated due to excessive tension during the transmission of the composite material roll, and prevent the ends of the material roll a from not rolling up. The battery cell formed by winding the composite material roll can ensure that no powder falls off at the corners of the battery cell, improve the uniformity of the positive and negative electrode heads, and improve the quality of the battery cell. There is a certain length of diaphragm b between the two material rolls a, which ensures the normal operation of the subsequent winding process. Moreover, the adhesive application component 8 applies the adhesive paper c in a follow-up manner, thereby achieving adhesive application without stopping the machine, improving lamination efficiency. In this embodiment, the material roll a is an electrode sheet or foil, preferably a negative electrode sheet.

[0033] Specifically, the unwinding assembly 1 includes an unwinding structure 11, an unwinding buffer structure 12, a brush dust removal structure 13, and a roll changing platform 14. The unwinding structure 11 unwinds the roll a, and the roll a is transmitted through the unwinding buffer structure 12 to the brush dust removal structure 13 to clean and remove dust from the surface of the roll a. The roll changing platform 14 facilitates the changing of the roll.

[0034] Specifically, the correction component 2 includes a roll correction structure 21 and a roll traction structure 22. The roll correction structure 21 can correct the roll a after unwinding to ensure the composite accuracy of roll a and diaphragm b. The roll traction structure 22 pulls roll a to the tension control component 3.

[0035] Specifically, the tension control component 3 includes a tension control structure 31, a tension sensor 32, and a roll length measuring structure 33. The roll a passes through the tension control structure 31, the tension sensor 32, and the roll length measuring structure 33 in sequence. The roll length measuring structure 33 detects the position of the roll a, the tension sensor 32 senses the tension of the roll a, and the tension control structure 31 adjusts the tension of the roll a.

[0036] Specifically, the tracking and cutting component 4 includes a clamping and correction structure 41 and a roll cutter structure 42. The clamping and correction structure 41 clamps the roll a. The clamping and correction structure 41 and the roll cutter structure 42 are driven together with the roll a. The roll cutter structure 42 cuts the roll a during its movement. The clamping and correction structure 41 moves the cut end of the roll a to the composite component 7, allowing the roll a to continue to move. This cutting method can cut the roll a during its movement without stopping the machine, thus improving the composite efficiency. The clamping and correction structure 41 moves the cut end of the roll a to the composite component 7 and corrects the deviation in real time, ensuring the positional accuracy between the roll and the diaphragm b.

[0037] Specifically, the first diaphragm unwinding assembly 5 includes a first diaphragm unwinding structure 51, a first diaphragm tension control structure 52, a diaphragm length measuring structure 53, and a diaphragm rewinding platform 54. The diaphragm b is unwound through the first diaphragm unwinding structure 51, and then transmitted to one side of the material roll a after passing through the first diaphragm tension control structure 52 and the diaphragm length measuring structure 53. The first diaphragm tension control structure 52 adjusts the tension of the diaphragm b, the diaphragm length measuring structure 53 detects the position of the diaphragm b, and the diaphragm rewinding platform 54 facilitates the rewinding of the diaphragm material roll.

[0038] Specifically, the second diaphragm unwinding assembly 6 includes a second diaphragm unwinding structure 61 and a second diaphragm tension control structure 62. The diaphragm b is unwound through the second diaphragm unwinding structure 61 and then transmitted to the other side of the roll a after passing through the second diaphragm tension control structure 62. The second diaphragm tension control structure 62 adjusts the tension of the diaphragm b.

[0039] Specifically, the composite component 7 includes a film-coating structure 71, a preheating structure 72, and a composite structure 73. The film-coating structure 71 pre-presses two layers of diaphragms b onto both sides of the roll a, ensuring that the relative position of the roll a and the diaphragms b does not change. The preheating structure 72 preheats the diaphragms b, which can increase the composite linear speed and thus improve the composite efficiency. The composite structure 73 combines the roll a and the diaphragms b to form a composite roll, ensuring that the roll a is fixed to the diaphragms b without falling off, arching, or forming air bubbles. The composite structure 73 includes an electromagnetic heating shaft, a main drive motor, a dust removal scraper, and a wiping roller. The main drive motor drives the electromagnetic heating shaft to rotate, and the roll a and the diaphragms b are combined between the two electromagnetic heating shafts to form a composite roll. The dust removal scraper and the wiping roller remove dust from the electromagnetic heating shaft.

[0040] Specifically, the detection component 9 includes a first detection structure 91, a second detection structure 92, and a labeling machine 93. The first detection structure 91 detects one side of the composite material roll, and the second detection structure 92 detects the other side of the composite material roll. If the first detection structure 91 and the second detection structure 92 detect wrinkles on the composite material roll, the wrinkled composite material roll is regarded as a defective product. The labeling machine 93 labels the defective composite material roll so that subsequent processes can identify and exclude defective products.

[0041] Specifically, the composite material roll take-up assembly 10 includes a take-up tension control structure 105, a web correction sensor 103, a take-up web correction structure 104, a take-up structure 101, a composite material roll changing platform 106, and a take-up pressure roller 102. After passing through the take-up tension control structure 105, the composite material roll is transferred to the take-up web correction structure 104. The web correction sensor 103 aligns the roll, and the take-up structure 101 takes up the composite material roll. The take-up tension control structure 105 can control the tension of the composite material roll to ensure the quality of the composite material roll. The web correction sensor 103 detects the position of the composite material roll and feeds it back to the take-up web correction structure 104. The take-up web correction structure 104 corrects the composite material roll in real time to ensure the flatness of the composite material roll during take-up. The take-up pressure roller 102 presses the composite material roll tightly onto the take-up structure 101 to ensure that the composite material roll can be tightened and does not deviate on the take-up structure 101. The composite material roll changing platform 106 facilitates the replacement of the composite material roll cylinder.

[0042] like Figure 2 and Figure 3 As shown, the present invention also provides another solution, a method for producing composite material rolls, comprising the following steps:

[0043] Step 1: Unwind material roll a, buffer material roll a, and remove dust from both ends of material roll a;

[0044] Step 2: Correct the deviation of material roll a and move material roll a to ensure that the position of material roll a after unwinding does not deviate;

[0045] Step 3: Check and adjust the tension of material roll a to keep it constant to ensure the quality of lamination;

[0046] Step 4: Measure the length of material roll a and determine its position to ensure that the diaphragm b is in the same position as material roll a;

[0047] Step 5: Cut the material roll a using a follow-cutting method, and move the cut end of the material roll a to the pre-compression position. This eliminates the need to stop the machine to cut the material roll a, thus improving production efficiency.

[0048] Step 6: Unwind diaphragm b, check and adjust the tension of diaphragm b to keep it constant to ensure the quality of the composite;

[0049] Step 7: Measure the length of diaphragm b and determine its position to ensure that diaphragm b is aligned with the position of roll a.

[0050] In steps 8 and 7, the diaphragm b is pre-pressed onto both sides of the roll a in step 5 and preheated, then rolled and laminated to form a composite roll.

[0051] Step 9: Apply adhesive tape to one or both ends of the composite roll where only two layers of diaphragm are laminated to increase the tension of diaphragm b.

[0052] Step 10: Inspect both ends of the composite material roll and label the unqualified composite material rolls in order to identify and exclude unqualified composite material rolls;

[0053] Step 11: Adjust the tension of the composite material roll and rewind the composite material roll to ensure that the tension of each roll is consistent.

[0054] The embodiments described above are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention patent application.

Claims

1. A composite material roll forming equipment for laminating adhesive after lamination, characterized in that, The assembly includes an unwinding component, a web guiding component, a tension control component, a follow-cutting component, a first diaphragm unwinding component, a second diaphragm unwinding component, a composite component, an adhesive application component, a detection component, and a composite roll rewinding component. The unwinding component unwinds the roll, which then moves sequentially to the web guiding component, the tension control component, and the follow-cutting component. The follow-cutting component cuts the roll and transfers it to the composite component. The diaphragm is unwound from the first and second diaphragm unwinding components and placed on both sides of the roll. The composite component laminates the diaphragm to both sides of the roll to form a composite roll. The adhesive application component applies adhesive paper between every two roll segments on the diaphragm of the composite roll. The composite roll is detected by the detection component and finally rewound by the composite roll rewinding component.

2. The composite roll forming equipment for laminating adhesive after lamination according to claim 1, characterized in that, The unwinding assembly includes an unwinding structure, an unwinding buffer structure, and a brush dust removal structure. The unwinding structure unwinds the material roll, and the material roll is conveyed through the unwinding buffer structure to the brush dust removal structure for cleaning and dust removal of the surface of the material roll.

3. The composite roll forming equipment for laminating adhesive after lamination according to claim 2, characterized in that, The tension control component includes a tension control structure, a tension sensor, and a roll length measuring structure. The roll length measuring structure detects the position of the roll, the tension sensor senses the tension of the roll, and the tension control structure adjusts the tension of the roll.

4. The composite roll forming equipment for laminating adhesive after lamination according to claim 3, characterized in that, The tracking and cutting assembly includes a clamping and correction structure and a roll cutting structure. The clamping and correction structure clamps the roll, the roll cutting structure cuts the roll, and the clamping and correction structure moves the cut end of the roll onto the composite assembly.

5. The composite roll forming equipment for laminating adhesive after lamination according to claim 4, characterized in that, The diaphragm unwinding assembly includes a diaphragm unwinding structure and a diaphragm tension control structure. The diaphragm is unwound through the diaphragm unwinding structure and then transmitted to both sides of the roll after passing through the diaphragm tension control structure.

6. The composite roll forming equipment for laminating adhesive after lamination according to claim 5, characterized in that, The composite component includes a membrane-coated structure, a preheating structure, and a composite structure. The membrane-coated structure presses the diaphragm tightly onto both sides of the roll. The preheating structure preheats the diaphragm in advance. The composite structure combines the roll and the diaphragm to form a composite roll.

7. The composite roll forming equipment for laminating adhesive after lamination according to claim 6, characterized in that, The composite structure includes an electromagnetic heating shaft, a main drive motor, a dust removal scraper, and a wiping roller. The main drive motor drives the electromagnetic heating shaft to rotate, and the material roll and the diaphragm pass between the two electromagnetic heating shafts to form a composite material roll. The dust removal scraper and the wiping roller remove dust from the electromagnetic heating shaft.

8. The composite roll forming equipment for laminating adhesive after lamination according to claim 7, characterized in that, The detection assembly includes a first detection structure, a second detection structure, and a labeling machine. The first detection structure detects one side of the composite material roll, the second detection structure detects the other side of the composite material roll, and the labeling machine labels the defective products detected by the first detection structure and the second detection structure.

9. The composite roll forming equipment for laminating adhesive after lamination according to claim 8, characterized in that, The composite material roll take-up assembly includes a take-up tension control structure, a web correction sensor, a take-up correction structure, a take-up structure, and a take-up pressure roller. The composite material roll is transferred to the take-up correction structure after passing through the take-up tension control structure. The web correction sensor aligns the roll, and the take-up structure takes up the composite material roll. The take-up pressure roller presses the composite material roll onto the take-up structure.

10. A method for producing composite rolls using a composite roll forming equipment for post-coating as described in claim 9, characterized in that, It includes the following steps: S1. Unwind the material roll, buffer the material roll, and remove dust from both ends of the material roll; S2. Correct the deviation of the material roll and move the material roll accordingly; S3. Detect and adjust the tension of the coil to maintain a constant value; S4. Measure the length of the material roll and determine its position; S5. Cut the material roll using a follow-cutting method and move the cut end of the material roll to the pre-compression position; S6. Unwind the diaphragm, check and adjust the diaphragm tension to keep it constant; S7. Measure the diaphragm length and determine the diaphragm position; S8. After the diaphragm in step S7 is pre-pressed to both sides of the roll in step S5 and preheated, it is rolled and laminated to form a composite roll. S9. Apply adhesive paper to one or both ends of the composite roll where only two layers of diaphragm are laminated. S10. Inspect both ends of the composite material roll and label any substandard composite material rolls. S11. Adjust the tension of the composite material roll and rewind the composite material roll.

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