Device for efficiently obtaining sizes of tabs

Abstract

The utility model discloses a device for efficiently obtaining the size of a tab, which comprises an operation box (1), a supporting structure for fixing and supporting a battery cell is arranged in the operation box (1), the supporting structure comprises a tray (2), the tray (2) is arranged in the operation box (1), and a side cutting die (3) and an end cutting die (4) are arranged in the operation box (1); the left side and the right side of the whole equipment are respectively provided with two pairs of side cutting dies (3) capable of cutting off gaps of tabs, the side cutting dies (3) with the middles located at the same horizontal position with naked battery cells and the end cutting dies (4) on the upper side and the lower side form a shearing effect to achieve the purpose of cutting off the gaps of the tabs, the side cutting dies (3) are wedge-shaped and can be conveniently inserted into the middles of the tabs, and the end cutting die (4) at the upper end is adjusted after positioning meets the conditions, so that the gaps of the tabs can be cut off. The upper end cutting die (4) and the lower end cutting die (4) are adjusted and then started, the tabs are cut off to leave gaps, and the left cutting die and the right cutting die are separated to respectively cut a positive tab gap and a negative tab gap.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy batteries. Specifically, the utility model relates to a device for efficiently obtaining the size of a tab. Background Art

[0002] Lithium / sodium ion battery is a secondary battery cell that can be repeatedly charged and discharged. It is composed of main components such as cathode and anode pole pieces, isolation membrane, electrolyte, mechanical parts, etc. At present, the volume of square shell wound multi-pole lithium / sodium ion battery cells is getting bigger and bigger, and the number of pole ears is also increasing. There are also fast-charging wound multi-pole battery cells whose number of pole ears needs to be doubled, and the difficulty of adjusting the pole ears is also doubled, especially for samples in the early stage of research and development. Its characteristics are that there are many types of sample models, many single model groups but small quantities, and the test paper has become a key process in the research and development cycle that takes a long time and costs a lot of materials. The test paper process is that the wound multi-pole battery test sample first gives the theoretical version of the die-cutting size and then winds it into a sample bare battery cell. The R&D engineer adjusts it according to the misalignment of the sample bare battery cell pole ears. The test paper process is actually broken down into negative cold pressing, negative die-cutting, negative stripping, positive die-cutting, positive The process consists of pole stripping, positive and negative electrode winding, during which the positive and negative pole tabs used in formal production are in a waiting state, where the negative pole is waiting after coating, and the positive pole is waiting after cold pressing. Under normal circumstances, the correct pole tab spacing size can be basically obtained by adjusting it once. However, for cells with a large number of pole tabs, the more significant the pole tab misalignment of the bare cell of the test sample obtained by the theoretical pole tab spacing size, the more significant it is. If the misalignment is to the winding corner, it is more difficult to measure the correct size, and a second test is required. The size adjustment process also requires skilled engineers. Inexperienced engineers may make mistakes and increase the number of tests. If the small test line is relatively backward, the equipment for die-cutting the pole tabs is a hardware knife die, and various samples need to switch the knife die back and forth during the normal queuing process, but this action will waste at least half a day, resulting in serious material piling in production.

[0003] Patent No. 202210862193.6, published on September 27, 2024, discloses a device and method for detecting the size and spacing of battery tabs. The device aims to address the problem in the prior art that contact measurement can cause deformation or scratches on the tabs and low detection efficiency. The device includes a mounting frame, a conveyor belt, a laser emitter, a photoelectric converter, and a processor. The laser emitter emits a laser beam onto the surface of the conveyor belt. The photoelectric converter receives light reflected from the tab when the laser beam hits the tab and converts the light into an electrical signal. The processor calculates the tab size and spacing of the battery tabs placed in the battery compartment 13 based on the duration of the received electrical signal and the transmission speed of the conveyor belt. Laser technology is used to measure the tab size and spacing, thereby avoiding the problem of tab scratches and deformation caused by contact measurement. Compared with manual measurement, the device also improves detection efficiency.

[0004] The volume of existing square shell battery cells is getting bigger and bigger, and the number of tab layers is increasing, which greatly increases the difficulty of testing. Especially for multi-tab fast charging cells, the number of tabs needs to be almost doubled to meet the overcurrent requirements, and the difficulty of tab adjustment is doubled, especially for small test lines, that is, experimental samples in the early stage of research and development. There are many types of samples and many groups, but the number is very small. Excessive testing times is not only a waste of time, but also a waste of cost. What's worse, an entire group may be wasted.

[0005] The shortcomings of the existing methods for obtaining the correct tab spacing are summarized as follows:

[0006] 1. Waste of time: It takes at least 2 working days from the test paper to normal winding; the time wasted on the test paper doubles with the number of test papers;

[0007] 2. Waste of materials: Samples with the same conditions are generally only 15 samples, and the test paper will waste the amount of 3 battery cells. The wasted amount doubles with the number of tests;

[0008] 3. Severe reliance on the accuracy of theoretically calculated tab spacing dimensions;

[0009] 4. It is heavily dependent on the experience and carefulness of the engineer who adjusts the tabs. Utility Model Content

[0010] The utility model aims to provide a device for obtaining the size of a tab with high efficiency and convenient detection.

[0011] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a device for efficiently obtaining the size of the tab, comprising an operating box, wherein the operating box is provided with a support structure for fixing and supporting the battery cell, the support structure comprises a tray for supporting the battery cell, the tray is arranged in the operating box, and the operating box is provided with a side knife die and an end knife die.

[0012] A cover plate located above the tray is provided in the operation box, and a pressurized telescopic rod is provided between the cover plate and the operation box.

[0013] A transverse track is provided in the operation box, a transverse electric slide is provided on the transverse track, and the transverse electric slide is connected to the tray.

[0014] A side track is provided in the operation box, and a lateral electric slider connected to the side cutting die is provided on the side track.

[0015] A telescopic cylinder is provided between the side cutter die and the lateral electric slide block.

[0016] An end track is provided in the operating box, an end electric slider is provided on the end track, a vertical track is provided on the end electric slider, a propulsion cylinder connected to the end cutting die is provided on the vertical track, and a vertical electric slider connected to the propulsion cylinder is provided on the vertical track.

[0017] The end rail and the vertical rail are perpendicular to each other.

[0018] The end knife die is U-shaped.

[0019] The operation box is provided with a control switch and a power line, and the operation box is provided with an air pipe.

[0020] The technical effect of the utility model is that the equipment is easy to operate, can greatly reduce the production cycle of experimental materials, and improve the utilization rate of research and development sample materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] This manual includes the following drawings, which show the following contents:

[0022] Figure 1 This is a structural schematic diagram of a device for efficiently obtaining the size of a tab in the present utility model.

[0023] The markings in the figure are: 1. Operation box; 2. Pallet; 3. Side cutting die; 4. End cutting die; 5. Cover plate; 6. Pressurized telescopic rod; 7. Horizontal rail; 8. Horizontal electric slider; 9. Side rail; 10. Lateral electric slider; 11. Telescopic cylinder; 12. End rail; 13. End electric slider; 14. Vertical rail; 15. Propulsion cylinder; 16. Control switch; 17. Power cord; 18. Air pipe; 19. Vertical electric slider. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation methods of the present invention by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution of the present invention and to facilitate its implementation.

[0025] See also Figure 1 , an efficient device for obtaining the size of the tab, comprising an operation box 1, wherein the operation box 1 is provided with a support structure for fixing and supporting the battery cell, wherein the support structure includes a tray 2 for supporting the battery cell, wherein the tray 2 is arranged in the operation box 1, and the operation box 1 is provided with a side knife die 3 and an end knife die 4; two pairs of side knife dies 3 are arranged on the left and right sides of the entire equipment, which can cut off the gaps in the tabs, and the side knife die 3 in the middle and at the same level as the bare battery cell forms a shearing effect with the end knife dies 4 on the upper and lower sides to achieve the purpose of cutting off the gaps in the shape of the tabs. The side knife die 3 is wedge-shaped, which is convenient for inserting into the middle of the tabs. After the positioning conditions are met, the end knife die 4 at the upper end is adjusted to match it with the side knife die 3 in the middle. After the upper and lower end knife dies 4 are adjusted, they are started again to cut off the tabs and leave blanks. The left and right are separated to cut out the gaps in the positive tabs and the negative tabs respectively.

[0026] The operating box 1 is provided with a cover plate 5 located above the tray 2, and a pressurized telescopic rod 6 is provided between the cover plate 5 and the operating box 1; the pressurized telescopic rod 6 is used to control the cover plate 5 to descend, so that the cover plate 5 and the tray 2 are used to compress the bare battery cells, facilitating subsequent cutting operations.

[0027] A transverse track 7 is provided in the operating box 1 , and a transverse electric slider 8 is provided on the transverse track 7 , and the transverse electric slider 8 is connected to the tray 2 ; the transverse track 7 drives the tray 2 to move left and right to control the position of the battery cell, which is convenient for subsequent cutting.

[0028] The operating box 1 is provided with a side rail 9, and the side rail 9 is provided with a lateral electric slider 10 connected to the side cutting die 3; so that the side cutting die 3 can move back and forth to reach the required position for insertion.

[0029] A telescopic cylinder 11 is provided between the side cutter die 3 and the lateral electric slider 10 ; the telescopic cylinder 11 controls the advance and retreat of the side cutter die 3 .

[0030] The operating box 1 is provided with an end rail 12, the end rail 12 is provided with an end electric slider 13, the end electric slider 13 is provided with a vertical rail 14, the vertical rail 14 is provided with a propulsion cylinder 15 connected to the end cutter die 4, and the vertical rail 14 is provided with a vertical electric slider 19 connected to the propulsion cylinder 15; the end rail 12 and the vertical rail 14 are used to achieve the purpose of multi-directional movement, and the propulsion cylinder 15 can be used to realize the lifting and lowering of the end cutter die 4, thereby achieving the purpose of cutting.

[0031] The end rail 12 and the vertical rail 14 are perpendicular to each other; they are easy to move and can be moved to any position on a plane, which is convenient for cutting.

[0032] The end cutter die 4 is U-shaped; the shape is adapted to the tab and can be cut well.

[0033] The operation box 1 is provided with a control switch 16 and a power cord 17 , and the operation box 1 is provided with an air pipe 18 ; the machine is controlled by the control switch 16 , and the air pipe 18 can supply air to the cylinder inside the device.

[0034] The device has the following requirements for sample bare cells:

[0035] 1. After the positive electrode is cold pressed, it is still waiting for formal winding. The positive electrode of the test paper needs to be slit; 2. After the negative electrode is coated, it is waiting for formal winding. Then the negative electrode of the test paper needs to be cold pressed and slit; 3. Wind the positive and negative electrode sheets and the isolation film of the test paper without cutting the tabs to form a sample bare cell with full tabs; Note that the blank areas of the positive and negative electrode tabs extend from opposite directions, mainly to reduce the pressure of cutting the tabs and cause great damage to the blade of the tooling; Also, avoid leaving space for both the positive and negative tabs on the same side, which is not conducive to measuring the correct tab spacing; 4. Place the bare cell on the new equipment with a clamp, and then cut as needed Find the space for cutting out the tabs; note that there is no requirement for the shape of the tabs, as long as the center of the space matches the center of the designed tab position; if the tabs are staggered between the upper and lower layers, you can first cut out the space for the tabs in the upper layer, then flip the bare cell 180 degrees, and then cut out the space for the tabs in the lower layer; the measured tab spacing is D1D2…Dn, but the actual size that needs to be entered into the die-cutting machine is based on the second spacing to the n-1th spacing plus the width of the tab space w, that is, D2+w, D3+w…Dn-1+w, and the first and last spacing are added with half of w, that is, D1+w / 2, Dn-1+w / 2.

[0036] Example 1: 100Ah lithium iron phosphate aluminum shell fast charging cell (new method)

[0037] Equipment preparation: Homemade equipment for cutting bare battery cell tabs and fully debugged.

[0038] Experimental verification process: 1. Select the bare cell with the most tabs being made on the small test line, which is exactly a 100Ah lithium iron phosphate multi-tab cell (one tab per layer); 2. Take the cold-pressed coil for the positive electrode, and directly cut it into two strips of the length required for the bare cells. The remaining coil is reserved, and the time t1 is recorded; note that the purpose of taking two bare cell lengths here is that one of the strips is used for threading on the winding machine, and the same applies to the negative electrode below; 3. Take the coated coil for the negative electrode, first cold-press it and then cut it into two strips of the length required for the bare cells, record the time t2, and the remaining coil is reserved; 4. Wind the positive and negative electrode sheets after cutting to obtain a bare cell with full tabs. Note that the positive and negative tabs here need to be led out from both ends respectively; record the time t3; 5. Send the bare cell to the homemade tab cutting equipment, Use the 100Ah mechanical parts to position the cutter, then press the button to control the cutter to fall, then retract the cutter, remove the bare battery cell, and record the time t4; 6. Disassemble the bare battery cell, measure the spacing dimensions of the vacancies of the positive and negative pole tabs respectively and record them, then add the corresponding vacancy width to the recorded spacing dimensions, and record the time t5; 7. Input the correct tab spacing dimensions obtained into the die-cutting equipment, and the obtained tab dimensions are shown in Table 2; starting from this step, the remaining operations are the same as normal battery cell preparation, so no time is recorded; 8. The positive and negative electrode coils are then die-cut, striped, and wound according to the new dimensions, and the bare battery cell tabs obtained have a high degree of alignment; 9. The time required for all the processes of the test paper is summarized as T = t1 + t2 + t3 + t4 + t5, and the data is summarized in Table 1. Comparative Example 1: 100Ah lithium iron phosphate aluminum shell battery cell (traditional method)

[0039] Experimental verification process: 1. Select the bare battery cell with the most tabs being made on the small test line, which is exactly a 100Ah lithium iron phosphate multi-pole tab battery cell (one tab per layer); 2. Take the cold-pressed coil for the positive electrode, first die-cut it with the theoretically calculated size, and then divide it into strips; about the length of 4 bare battery cells is used, and the remaining coil is reserved; these actions are recorded in time t1; note that the purpose of taking 4 bare battery cell lengths here is that one of them is used to thread the tape on the winding machine, and the other three are used to adjust the position of the first ring of tabs during winding and to ensure that at least two consecutive bare battery cells have similar tab misalignment degrees; the same is true for the negative electrode below; 3. Take the coated coil for the negative electrode, first cold-press it and then die-cut it with the theoretically calculated size, and then divide it into strips with the length of 4 bare battery cells, record the time t2, and the remaining coil is reserved; 4. The positive and negative electrode sheets after slicing are wound to obtain multi-pole tab bare cells, and record the time Time t3; note that the winding here requires adjusting the position of the first ring of tabs to ensure that the position of the positive and negative tabs in the first ring is correct. This is an operation not included in the example; 5. Bring the bare battery cell back to the workstation. The engineer needs to measure the degree of misalignment of each tab one by one, and pay attention to the position changes of the overhang and tail of the head and tail of the battery cell, and then derive the new tab size based on the theoretical size; record the time t5; 6. Input the correct tab spacing size obtained into the die-cutting equipment, and the tab size obtained is shown in Table 3; starting from this step, the remaining operations are the same as normal battery cell preparation, so the time is no longer recorded; 7. The positive and negative electrode coils are die-cut, striped, and wound according to the new size. The alignment of the bare battery cell tabs is very poor. If formal production is required, a second test paper is required; 8. The time required to summarize all the processes of the test paper is T = t1 + t2 + t3 + t5, and the data is summarized in Table 1.

[0040] Table 1 (comparison of process time):

[0041]

[0042] Table 2 (die-cutting dimensions): Example 1

[0043] Serial number negative electrode Serial number negative electrode Serial number negative electrode Serial number negative electrode D1 226 D21 236.1 D41 245.8 D61 256.4 D2 68.5 D22 78.1 D42 87.5 D62 95.9 D3 227 D23 236.9 D43 246.7 D63 257.4 D4 69.7 D24 79.3 D44 88.5 D64 96.9 D5 228.1 D25 237.7 D45 247.6 D65 258.5 D6 70.7 D26 80.3 D46 89.4 D66 97.7 D7 229.2 D27 238.8 D47 248.8 D67 259.5 D8 71.7 D28 81.1 D48 90.2 D68 98.8 D9 230.3 D29 239.9 D49 249.8 D69 260.5 D10 72.5 D30 81.9 D50 91 D70 99.9 D11 231.1 D31 240.8 D51 250.9 D71 261.4 D12 73.4 D32 83 D52 91.8 D72 101 D13 232.1 D33 241.8 D53 252 D73 262.2 D14 74.4 D34 83.9 D54 92.6 D74 61.9 D15 233.1 D35 242.8 D55 253.1 D16 75.3 D36 84.8 D56 93.4 D17 234.2 D37 243.7 D57 254.2 D18 76.1 D38 85.8 D58 94.2 D19 235.1 D39 244.7 D59 255.3 D20 77.1 D40 86.6 D60 95.1

[0044] Example 1

[0045] Serial number positive electrode Serial number positive electrode Serial number positive electrode Serial number positive electrode D1 176 D21 80.5 D41 90.3 D61 99.7 D2 225 D22 234.5 D42 243.8 D62 253.5 D3 71.5 D23 81.6 D43 91.2 D63 100.6 D4 226 D24 235.3 D44 244.7 D64 254.6 D5 72.6 D25 82.5 D45 92.2 D65 101.5 D6 227 D26 236.4 D46 245.7 D66 255.7 D7 73.8 D27 83.5 D47 93.1 D67 102.5 D8 228.1 D28 237.4 D48 246.7 D68 256.9 D9 74.8 D29 84.4 D49 94.1 D69 103.3 D10 228.9 D30 238.4 D50 247.6 D70 257.9 D11 75.9 D31 85.3 D51 94.9 D71 104.4 D12 229.7 D32 239.3 D52 248.7 D72 95.7 D13 76.7 D33 86.3 D53 95.8 D14 230.7 D34 240.3 D54 249.6 D15 77.6 D35 87.2 D55 96.9 D16 231.9 D36 241.2 D56 250.6 D17 78.6 D37 88.3 D57 97.8 D18 232.7 D38 242.1 D58 251.7 D19 79.6 D39 89.2 D59 98.7 D20 233.5 D40 243 D60 252.5

[0046] Table 3 (die-cutting dimensions of Comparative Example 1): Comparative Example 1

[0047] Serial number negative electrode Serial number negative electrode Serial number negative electrode Serial number negative electrode D1 226 D21 233.8 D41 243.4 D61 255.4 D2 68.5 D22 81.7 D42 90.9 D62 97.6 D3 228.2 D23 234.8 D43 244.3 D63 256.5 D4 71.3 D24 82.4 D44 91.9 D64 98.2 D5 228.3 D25 236.1 D45 245.3 D65 258.2 D6 72.2 D26 83.2 D46 92.7 D66 98.8 D7 229.3 D27 236.9 D47 246.5 D67 259.6 D8 73.2 D28 84.2 D48 93.5 D68 99 D9 229.8 D29 237.8 D49 247.7 D69 261 D10 75.7 D30 85.2 D50 94 D70 99.6 D11 229.8 D31 238.8 D51 248.9 D71 262.5 D12 76.7 D32 86.2 D52 94.8 D72 100 D13 230.6 D33 239.8 D53 250.2 D73 264.3 D14 77.7 D34 87.1 D54 95.3 D74 18.6 D15 231.2 D35 240.6 D55 251.5 D16 77.8 D36 88.2 D56 96 D17 233.2 D37 241.4 D57 252.6 D18 79.8 D38 89.3 D58 96.6 D19 233.2 D39 242.3 D59 253.9 D20 80.8 D40 90.2 D60 97.1

[0048] Comparative Example 1

[0049] Serial number positive electrode Serial number positive electrode Serial number positive electrode Serial number positive electrode D1 176 D21 80.1 D41 90 D61 100.2 D2 226 D22 236.3 D42 245.1 D62 253.8 D3 71.7 D23 81.2 D43 90.9 D63 101.2 D4 227.7 D24 237.1 D44 246.1 D64 254.6 D5 72.8 D25 82.2 D45 91.9 D65 102.2 D6 228.7 D26 237.8 D46 247 D66 255.6 D7 73.7 D27 83.2 D47 92.8 D67 103 D8 229.6 D28 238.8 D48 248 D68 256.5 D9 74.8 D29 84.2 D49 93.8 D69 104 D10 230.5 D30 239.8 D50 248.8 D70 257.4 D11 75.6 D31 85 D51 94.7 D71 104.9 D12 231.5 D32 240.6 D52 249.9 D72 65.7 D13 76.5 D33 86.1 D53 95.6 D14 232.4 D34 241.6 D54 250.6 D15 77.5 D35 86.9 D55 96.9 D16 233.3 D36 242.6 D56 251.4 D17 78.4 D37 87.9 D57 97.9 D18 234.4 D38 243.6 D58 252.1 D19 79.1 D39 88.9 D59 99.2 D20 235.4 D40 244.3 D60 252.8

[0050] The technical effects of the present invention are as follows: the equipment is easy to operate, can greatly reduce the production cycle of experimental materials, improve the utilization rate of research and development sample materials, does not require theoretical calculation of the tab spacing size, does not need to die-cut the tabs during the test, and can directly wind the battery cell with full tabs into a sample bare battery cell, and then use a homemade small tooling equipment to cut off the tab position to form a tab space, and then unfold the battery cell to directly measure the spacing between each tab space. This measurement interval can be measured using a laser meter or manually, does not require any technology or skills, and does not require any experience of engineers.

[0051] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. An efficient device for obtaining tab size, characterized by: The invention comprises an operating box (1), wherein a support structure for fixing and supporting an electric core is provided in the operating box (1), wherein the support structure comprises a tray (2) for supporting the electric core, wherein the tray (2) is arranged in the operating box (1), and wherein a side knife die (3) and an end knife die (4) are provided in the operating box (1).

2. The device for efficiently obtaining the tab size according to claim 1, characterized in that: A cover plate (5) located above the tray (2) is provided in the operating box (1), and a pressurized telescopic rod (6) is provided between the cover plate (5) and the operating box (1).

3. The device for efficiently obtaining the tab size according to claim 1, characterized in that: A transverse track (7) is provided in the operating box (1), a transverse electric slider (8) is provided on the transverse track (7), and the transverse electric slider (8) is connected to the tray (2).

4. The device for efficiently obtaining the tab size according to claim 1, characterized in that: A side rail (9) is provided in the operating box (1), and a lateral electric slider (10) connected to the side cutting die (3) is provided on the side rail (9).

5. The device for efficiently obtaining the tab size according to claim 4, characterized in that: A telescopic cylinder (11) is provided between the side cutter die (3) and the lateral electric slider (10).

6. The device for efficiently obtaining the tab size according to claim 1, characterized in that: An end rail (12) is provided in the operating box (1), an end electric slider (13) is provided on the end rail (12), a vertical rail (14) is provided on the end electric slider (13), a propulsion cylinder (15) connected to the end cutting die (4) is provided on the vertical rail (14), and a vertical electric slider (19) connected to the propulsion cylinder (15) is provided on the vertical rail (14).

7. The device for efficiently obtaining the tab size according to claim 6, characterized in that: The end rail (12) and the vertical rail (14) are perpendicular to each other.

8. The device for efficiently obtaining the tab size according to claim 1 or 6, characterized in that: The end knife die (4) is U-shaped.

9. The device for efficiently obtaining the tab size according to claim 1, characterized in that: The operating box (1) is provided with a control switch (16) and a power line (17), and the operating box (1) is provided with an air pipe (18).

Images