Tab alignment degree adjusting method, adjusting device and winding system

Abstract

The invention relates to the technical field of battery cell winding, and discloses a tab alignment degree adjusting method, an adjusting device and a winding system. The tab alignment degree adjusting method comprises the following steps: determining the offset of a tab; if the absolute value of the offset is greater than the first threshold value and less than the second threshold value, determining a distance compensation value between the two adjacent tabs according to the offset; and if the absolute value of the offset is greater than or equal to a second threshold value, determining a distance compensation value between the anilox roller and the passing roller according to the offset. According to the adjusting method, when the absolute value of the offset of the tabs is larger than the first threshold value and smaller than the second threshold value, the offset of the tabs can be improved by compensating the distance between every two adjacent tabs by utilizing the characteristic that the cutting precision of the die cutting device is high. And when the absolute value of the offset of the tab is greater than or equal to the second threshold value, the offset of the tab can be improved by compensating the distance between the anilox roller and the passing roller by utilizing the characteristic that the distance between the anilox roller and the passing roller has a relatively large adjusting range.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core winding, and in particular to a method for adjusting the alignment of a tab, an adjusting device and a winding system. Background Art

[0002] Lithium battery is a secondary battery that can realize the mutual conversion of chemical energy and electrical energy. In the production process, the battery cell of lithium battery can be formed by winding or stacking. Compared with the stacking method, the winding method has lower cost and is widely used in the production of battery cells for energy storage and power batteries.

[0003] When winding cells, the alignment of the cell tabs is a difficult problem in the manufacturing process. If the tab distribution deviates significantly from the standard distribution, it may cause a short circuit or dielectric leakage inside the battery, thus causing safety hazards. Summary of the invention

[0004] The invention provides a method for adjusting the alignment of a tab, an adjusting device and a winding system, which are used to improve the alignment of the tab and improve the safety performance of a battery.

[0005] In a first aspect, the present invention provides a method for adjusting the alignment of a tab. The method is applied to a winding system; the winding system comprises a die-cutting device, an anilox roller, a roller and a winding needle; the die-cutting device is used to cut a material strip so that the material strip has a plurality of tabs; the anilox roller and the roller are located between the die-cutting device and the winding needle, and there is a gap between the anilox roller and the roller for the material strip to pass through, and the anilox roller is used to roll the material strip during the material strip passes through the gap; the winding needle is used to wind the material strip to form a battery cell;

[0006] The method for adjusting the alignment of the tabs comprises:

[0007] Determining an offset of the tab;

[0008] If the absolute value of the offset is greater than a first threshold value and less than a second threshold value, determining a spacing compensation value between two adjacent tabs according to the offset;

[0009] If the absolute value of the offset is greater than or equal to the second threshold, a spacing compensation value between the anilox roller and the transfer roller is determined according to the offset.

[0010] The beneficial effects of the tab alignment adjustment method provided by the present invention are as follows:

[0011] In the above-mentioned method for adjusting the alignment of the tabs, if the absolute value of the offset of the tabs is greater than the first threshold value and less than the second threshold value, it means that the offset of the tabs is relatively small. Since the cutting accuracy of the die-cutting device is relatively high, the distance between two adjacent tabs can be slightly changed by adjusting the die-cutting parameters of the die-cutting device, thereby improving the small offset of the tabs. In other words, when the offset of the tabs meets the above-mentioned range, the offset of the tabs can be improved by compensating the distance between two adjacent tabs.

[0012] If the absolute value of the offset of the pole lug is greater than or equal to the second threshold, it means that the offset of the pole lug is relatively large. The spacing between the anilox roller and the roller has a large range of variation, so that the thickness of the material strip has a large range of variation, which can effectively offset the large offset of the pole lug. Therefore, when the absolute value of the offset of the pole lug is greater than or equal to the second threshold, the offset of the pole lug can be improved by compensating the thickness of the material strip.

[0013] In a second aspect, the present invention further provides a regulating device. The regulating device comprises:

[0014] A first determination module, used to determine the offset of the tab;

[0015] A first compensation module, configured to determine a spacing compensation value between two adjacent tabs according to the offset if the absolute value of the offset is greater than a first threshold and less than a second threshold;

[0016] The second compensation module is configured to determine a compensation value for the spacing between the anilox roller and the transfer roller according to the offset if the absolute value of the offset is greater than or equal to the second threshold.

[0017] The beneficial effects of the regulating device provided by the present invention are as follows:

[0018] In the process of improving the offset of the pole lug, the above-mentioned adjustment device can improve the offset of the pole lug in different ways after the first determination module determines the offset of the pole lug. When the absolute value of the offset of the pole lug is greater than the first threshold value and less than the second threshold value, the high cutting accuracy of the die-cutting device can be utilized to improve the offset of the pole lug by compensating for the distance between two adjacent pole lugs. When the absolute value of the offset of the pole lug is greater than or equal to the second threshold value, the spacing between the anilox roller and the over roller has a large adjustment range, and the roller pressure of the anilox roller on the material strip can be adjusted by compensating for the spacing between the anilox roller and the over roller, thereby changing the thickness of the material strip and improving the offset of the pole lug.

[0019] In a third aspect, the present invention further provides a winding system. The winding system comprises a die-cutting device, an anilox roller, a roller, a driving device, a winding needle and the adjusting device described in the second aspect above; wherein:

[0020] The die-cutting device is used to cut the material strip so that the material strip has a plurality of pole ears; the die-cutting device is connected to the adjusting device and is used to adjust the distance between two adjacent pole ears according to the distance compensation value between the two adjacent pole ears determined by the adjusting device;

[0021] The anilox roller and the over roller are located between the die-cutting device and the winding needle, and there is a gap between the anilox roller and the over roller for the material tape to pass through, and the anilox roller is used to roll the material tape when the material tape passes through the gap;

[0022] The driving device is connected to the adjusting device and is used to adjust the distance between the anilox roller and the passing roller according to the distance compensation value between the anilox roller and the passing roller determined by the adjusting device;

[0023] The winding needle is used to wind the material strip and the separator to form a battery cell.

[0024] The beneficial effects of the winding system provided by the present invention are as follows:

[0025] In the process of winding the battery cell, the adjusting device can determine the spacing compensation value between the two pole lugs or the spacing compensation value between the anilox roller and the over roller according to the offset of the pole lug. After the adjusting device determines the spacing compensation value between two adjacent pole lugs, the die-cutting device can compensate the spacing between the two adjacent pole lugs according to the spacing compensation value, thereby improving the offset of the pole lug. After the adjusting device determines the spacing compensation value between the anilox roller and the over roller, the driving device can make the anilox roller and the over roller relatively close or relatively far away, thereby adjusting the roller pressure of the anilox roller on the material strip, thereby changing the thickness of the material strip and improving the offset of the pole lug. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a winding system provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a material strip provided in an embodiment of the present invention after being cut by a die-cutting device;

[0028] Figure 3 A schematic diagram of a process flow of a method for adjusting the alignment of a tab provided by an embodiment of the present invention;

[0029] Figure 4 Another schematic flow chart of a method for adjusting the alignment of a tab provided by an embodiment of the present invention;

[0030] Figure 5 Another schematic flow chart of a method for adjusting the alignment of a tab provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a composition of an adjusting device provided in an embodiment of the present invention;

[0032] Figure 7 Another schematic diagram of the composition of the regulating device provided in an embodiment of the present invention;

[0033] Figure 8 Another schematic diagram of the composition of the regulating device provided in an embodiment of the present invention;

[0034] Fig. 9 Another structural schematic diagram of a winding system provided in an embodiment of the present invention.

[0035] Reference numerals:

[0036] 10- unwinding roller; 20- die-cutting device;

[0037] 30-pass roller; 40-anilox roller;

[0038] 50-driving device; 60-winding needle;

[0039] 70-adjusting device; 701-first determining module;

[0040] 702-first compensation module; 703-second compensation module;

[0041] 704-first acquisition module; 705-third compensation module;

[0042] 706-second acquisition module; 707-second determination module;

[0043] 708-calibration module; 80-material strip;

[0044] 801-ear; 8011-reference ear;

[0045] 8012-first pole ear; 90-diaphragm. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the example embodiments of the present application to clearly and completely describe the technical solutions in the example embodiments of the present application. The example embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of protection of the present application.

[0047] In the description of the present application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0048] Unless otherwise specified or explained, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Figure 1 Schematic diagram of a winding system provided in an embodiment of the present application, the winding system is used to wind the material strip 80 and the separator 90 to form a battery core. Figure 1 As shown, in one embodiment, the winding system includes a die-cutting device 20, a roller 30, an anilox roller 40 and a winding needle 60. The roller 30 and the anilox roller 40 are located between the die-cutting device 20 and the winding needle 60, and there is a gap between the roller 30 and the anilox roller 40 for the material strip 80 to pass through. In the process of preparing the battery cell, the material strip 80 first passes through the die-cutting device 20, then passes through the gap between the roller 30 and the anilox roller 40, and finally, the material strip 80 and the diaphragm 90 are wound on the winding needle 60. Generally speaking, the above-mentioned winding system also includes a unwinding roller 10, and the material strip 80 is wound on the unwinding roller 10 in a roll before being wound into a battery cell. During the winding process, the unwinding roller 10 is used to unwind the material strip 80.

[0050] Please continue to refer to Figure 1 In the winding system, the die-cutting device 20 is arranged between the unwinding roller 10 and the winding needle 60, and the die-cutting device 20 is used to cut the material strip 80. Figure 2 A schematic diagram of the structure of the material strip provided in the embodiment of the present application after being cut by the die-cutting device, wherein the material strip 80 has a plurality of tabs 801 after being cut. When the die-cutting parameters of the die-cutting device 20 change, the spacing between two adjacent tabs 801 in the plurality of tabs 801 formed by cutting will also change.

[0051] The roller 30 and the anilox roller 40 are arranged between the die-cutting device 20 and the winding needle 60. The central axis of the roller 30 is parallel to the central axis of the anilox roller 40, and the roller 30 and the anilox roller 40 are arranged at intervals. After being cut by the die-cutting device 20, the material belt 80 passes through the gap between the roller 30 and the anilox roller 40. In the process of the material belt 80 passing through the gap between the roller 30 and the anilox roller 40, the anilox roller 40 can roll the material belt 80.

[0052] The surface of the anilox roller 40 has a convex bulge, and after the material strip 80 is rolled by the anilox roller 40, a corresponding indentation is formed on the surface of the material strip 80. When the spacing between the anilox roller 40 and the over roller 30 changes, the rolling pressure of the anilox roller 40 on the material strip 80 is different, the depth of the indentation formed on the surface of the material strip 80 is different, and the thickness of the material strip 80 also changes differently. Specifically, when the gap between the anilox roller 40 and the over roller 30 is increased, the rolling pressure of the anilox roller 40 on the material strip 80 increases, the indentation formed on the surface of the material strip 80 becomes deeper, and the thickness of the material strip 80 increases. Conversely, when the gap between the anilox roller 40 and the over roller 30 is reduced, the rolling pressure of the anilox roller 40 on the material strip 80 decreases, the indentation formed on the surface of the material strip 80 becomes shallower, and the thickness of the material strip 80 decreases.

[0053] In order to adjust the distance between the anilox roller 40 and the over roller 30 to change the thickness of the material strip 80, the winding system also includes a driving device 50, which is used to drive the anilox roller 40 and the over roller 30 to be relatively close to or relatively far away from each other, so that the distance between the anilox roller 40 and the over roller 30 changes, and then the roller pressure of the anilox roller 40 on the material strip 80 changes, and the thickness of the material strip 80 also changes accordingly.

[0054] The winding needle 60 is used to wind the material strip 80 and the separator 90 to form a battery cell. In the process of preparing the battery cell, when a roll of the material strip 80 or the separator 90 is used up, a new material strip 80 and the separator 90 can be replaced and the winding can continue. However, the thickness of different material strips 80 and separators 90 may be different, which may cause the position of the tab 801 to shift before and after the material replacement.

[0055] In order to improve the alignment of the tab 801 , an embodiment of the present application provides a method for adjusting the alignment of the tab. Figure 3 A schematic diagram of a process for adjusting the alignment of the tabs provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the tab alignment adjustment method specifically includes the following steps:

[0056] Step 101 : Determine the offset of the tab 801 .

[0057] For a standard battery cell, the tab 801 is distributed in a sector-shaped area with a central angle of 90°, and the arc length corresponding to the sector-shaped area is the standard arc length. The offset of the tab 801 may be the angle value of the area where the tab 801 is actually distributed relative to the sector-shaped area, or the offset of the tab 801 may also be the difference between the arc length value corresponding to the area where the tab 801 is actually distributed and the arc length value corresponding to the sector-shaped area.

[0058] Step 102: If the absolute value of the offset of the tab 801 is greater than the first threshold and less than the second threshold, determine the spacing compensation value between two adjacent tabs 801 according to the offset of the tab 801; the spacing compensation value can be recorded as the first tab spacing compensation value.

[0059] The above-mentioned first pole lug spacing compensation value refers to the amount by which the spacing between two adjacent pole lugs 801 needs to be increased or reduced on the original basis in order to improve the offset of the pole lug 801 while ensuring that other factors remain unchanged; optionally, the above-mentioned first pole lug spacing compensation value can be a positive value or a negative value.

[0060] Step 103 : if the absolute value of the offset of the pole tab 801 is greater than or equal to the second threshold, determining a spacing compensation value between the anilox roller 40 and the transfer roller 30 according to the offset of the pole tab 801 .

[0061] The above spacing compensation value refers to the amount by which the spacing between the anilox roller 40 and the roller 30 needs to be increased or reduced on the original basis in order to improve the offset of the pole ear 801 while ensuring that other factors remain unchanged; optionally, the above spacing compensation value can be a positive value or a negative value.

[0062] In the prepared battery cell, the distribution range of the tab 801 is related to factors such as the thickness of the material strip 80 unwound by the unwinding roller 10, the thickness of the diaphragm 90, the distance between two adjacent tabs 801, and the distance between the anilox roller 40 and the over roller 30. The values ​​of the above parameters in the standard battery cell are recorded as standard values. When one or more of the parameters change, the distribution range of the tab 801 in the prepared battery cell may be offset.

[0063] When other parameters remain unchanged and only the spacing between two adjacent pole tabs 801 changes, there is a first corresponding relationship between the offset of the pole tab 801 and the spacing change between the two adjacent pole tabs 801. In the above step 102, in the process of determining the first pole tab spacing compensation value according to the offset of the pole tab 801, first, the spacing change ΔL1 between the two adjacent pole tabs 801 is determined according to the offset of the pole tab 801 and the above first corresponding relationship; then, the first pole tab spacing compensation value is determined according to the spacing change ΔL1.

[0064] After determining the first pole tab spacing compensation value, the die-cutting device 20 can adjust the die-cutting parameters according to the first pole tab spacing compensation value, so that the spacing between two adjacent pole tabs 801 in the multiple pole tabs 801 re-formed by cutting the material strip 80 changes accordingly, and then in the process of winding to form the battery cell, the position of the pole tab 801 can be corrected to reduce the offset of the pole tab 801.

[0065] Similarly, when other parameters remain unchanged and only the spacing between the anilox roller 40 and the roller 30 changes, there is a second corresponding relationship between the offset of the pole lug 801 and the spacing change between the anilox roller 40 and the roller 30. In the above step 103, in the process of determining the spacing compensation value between the anilox roller 40 and the roller 30 according to the offset of the pole lug 801, first, the spacing change ΔL2 between the anilox roller 40 and the roller 30 is determined according to the offset of the pole lug 801 and the above second corresponding relationship; then, the spacing compensation value between the anilox roller 40 and the roller 30 is determined according to the spacing change ΔL2.

[0066] After determining the spacing compensation value between the anilox roller 40 and the passing roller 30, the driving device 50 can adjust the spacing between the anilox roller 40 and the passing roller 30 according to the above spacing compensation value, so that the roller pressure of the anilox roller 40 on the material strip 80 changes, and the thickness of the material strip 80 also changes accordingly. Then, in the process of winding to form the battery cell, the position of the pole ear 801 can be corrected and the offset of the pole ear 801 can be reduced.

[0067] In the method for adjusting the alignment of the tabs provided in the present application, if the absolute value of the offset of the tab 801 is greater than the first threshold value and less than the second threshold value, it means that the offset of the tab 801 is relatively small. Since the cutting accuracy of the die-cutting device 20 is relatively high, the distance between two adjacent tabs 801 can be slightly changed by adjusting the die-cutting parameters of the die-cutting device 20, thereby improving the small offset of the tab 801.

[0068] In specific implementation, when the offset of the tab 801 satisfies the above range, the first tab spacing compensation value can be determined by step 102. The die-cutting device 20 can finely adjust the die-cutting parameters according to the first tab spacing compensation value, so that the spacing between two adjacent tabs 801 in the multiple tabs 801 re-formed by cutting the strip 80 also changes accordingly, thereby effectively improving the offset of the tabs 801.

[0069] If the absolute value of the offset of the pole tab 801 is greater than or equal to the second threshold, it means that the offset of the pole tab 801 is relatively large. The spacing between the anilox roller 40 and the over roller 30 has a large range of variation, so that the thickness of the material strip 80 has a large range of variation, which can effectively offset the offset of the pole tab 801. Therefore, when the absolute value of the offset of the pole tab 801 is greater than or equal to the second threshold, step 103 can be used to determine the spacing compensation value between the anilox roller 40 and the over roller 30, and then the spacing between the anilox roller 40 and the over roller 30 is adjusted according to the above spacing compensation value, so that the roller pressure of the anilox roller 40 on the material strip 80 changes, and the thickness of the material strip 80 also changes accordingly, thereby improving the offset of the pole tab 801 in the process of winding the material strip 80 to form a battery cell.

[0070] It should be noted that if the absolute value of the offset of the tab 801 is less than or equal to the first threshold, it means that the tab 801 has not offset, or the tab 801 has slightly offset, and the offset of the tab 801 is within the allowed range.

[0071] In a specific embodiment, in step 103, when the absolute value of the offset of the pole ear 801 is greater than or equal to the second threshold value, the thickness compensation value of the material strip 80 is first determined according to the offset of the pole ear 801, and then the spacing compensation value between the anilox roller 40 and the roller 30 is determined according to the thickness compensation value of the material strip 80, and then the spacing between the anilox roller 40 and the roller 30 is adjusted according to the above spacing compensation value.

[0072] Figure 4 Another schematic flow chart of a method for adjusting the alignment of tabs provided in an embodiment of the present invention is as follows: Figure 4 As shown, in one embodiment, before step 101, the tab alignment adjustment method further includes the following steps:

[0073] Step 104: Obtaining the standard thickness of the material strip 80 and the actual thickness of the material strip 80 before cutting;

[0074] Step 105: If the absolute value of the difference between the standard thickness of the material strip 80 and the above-mentioned actual thickness is greater than or equal to the third threshold, the spacing compensation value between two adjacent pole tabs 801 is determined according to the standard thickness of the material strip 80 and the above-mentioned actual thickness; the spacing compensation value can be recorded as the second pole tab spacing compensation value.

[0075] The above-mentioned second pole lug spacing compensation value refers to the amount by which the spacing between two adjacent pole lugs 801 needs to be increased or reduced on the original basis in order to improve the displacement of the pole lug 801 caused by the change in the thickness of the material strip 80, while ensuring that other factors remain unchanged; optionally, the above-mentioned second pole lug spacing compensation value can be a positive value or a negative value.

[0076] It should be noted that the standard thickness of the material strip 80 is a known quantity, which is the thickness of the material strip 80 corresponding to the standard battery cell before cutting.

[0077] Specifically, after the material strip 80 is unwound by the unwinding roller 10 and before it is cut by the die-cutting device 20, the actual thickness of the material strip 80 can be detected first. If the actual thickness of the material strip 80 fluctuates relative to the standard thickness of the material strip 80, and the absolute value of the difference between the two is greater than or equal to the third threshold value, it means that the thickness change of the material strip 80 will have a non-negligible impact on the alignment of the pole lugs 801. Then, the second pole lug spacing compensation value is determined according to the actual thickness of the material strip 80 and the standard thickness of the material strip 80. Finally, the die-cutting parameters of the die-cutting device 20 are adjusted according to the second pole lug spacing compensation value, so that the spacing between two adjacent pole lugs 801 in the multiple pole lugs 801 re-formed by cutting the material strip 80 by the die-cutting device 20 changes accordingly, and then in the process of winding to form a battery cell, the position of the pole lug 801 can be corrected and the offset of the pole lug 801 can be reduced.

[0078] In a specific implementation, the actual thickness of the material strip 80 before cutting can be detected by a thickness measuring device.

[0079] Optionally, the third threshold may be 0.25 um.

[0080] After completing step 104 and step 105, the phenomenon of the pole tab 801 being offset due to the change in thickness of the material strip 80 is improved. The material strip 80 may be a positive electrode material strip or a negative electrode material strip. In specific implementation, the second pole tab spacing compensation value corresponding to the positive electrode material strip may be obtained according to the above steps 104 and 105, thereby improving the pole tab 801 offset due to the change in thickness of the positive electrode material strip. In addition, the second pole tab spacing compensation value corresponding to the negative electrode material strip may be obtained according to the above steps 104 and 105, thereby improving the pole tab 801 offset due to the change in thickness of the negative electrode material strip.

[0081] Through the above steps 104 and 105, the displacement of the pole ear 801 caused by the thickness change of the material strip 80 can be improved before the material strip 80 is wound to form a battery cell. When the thickness of the diaphragm 90 remains unchanged or changes slightly, the pole ear 801 does not shift, or the displacement of the pole ear 801 does not exceed the first threshold value, thereby improving the yield of the first battery cell formed by winding after the material replacement.

[0082] Please continue to refer to Figure 4 After completing step 104, the deviation of the tab 801 can be corrected according to the method of steps 101 to 103, so as to improve the deviation of the tab 801 caused by the change in thickness of the diaphragm 90 before and after the material replacement and other factors.

[0083] In a specific embodiment, the die-cutting parameters of the die-cutting device 20 are adjusted twice in sequence. The first adjustment process is as follows: first, the actual thickness of the material strip 80 before cutting is obtained; then, the second tab spacing compensation value is determined according to the actual thickness of the material strip 80 and the standard thickness of the material strip 80; finally, the die-cutting parameters of the die-cutting device 20 are adjusted for the first time according to the second tab spacing compensation value.

[0084] The second adjustment process is as follows: first, during the process of winding the material strip 80 to form a battery cell, the offset of the pole ear 801 is determined; then, the first pole ear spacing compensation value is determined based on the offset of the pole ear 801; finally, the die-cutting parameters of the die-cutting device 20 are adjusted for the second time based on the first pole ear spacing compensation value.

[0085] After each of the above adjustments, the distance between two adjacent pole tabs 801 will change accordingly, so that during the process of winding to form a battery cell, the position of the pole tab 801 can be corrected and the deviation of the pole tab 801 can be reduced.

[0086] In another specific embodiment, the die-cutting parameters of the die-cutting device 20 are first adjusted, and then the spacing between the anilox roller 40 and the over roller 30 is adjusted. The adjustment process of the die-cutting parameters of the die-cutting device 20 is as follows: first, the actual thickness of the material strip 80 before cutting is determined; then, the second tab spacing compensation value is determined according to the actual thickness of the material strip 80 and the standard thickness of the material strip 80; finally, the die-cutting parameters of the die-cutting device 20 are adjusted according to the second tab spacing compensation value. After the die-cutting parameters of the die-cutting device 20 change, the spacing between two adjacent tabs 801 in the multiple tabs 801 formed by cutting the material strip 80 by the die-cutting device 20 also changes accordingly, so that in the process of winding to form a battery cell, the position of the tab 801 can be corrected and the deviation of the tab 801 can be reduced.

[0087] The adjustment process of the spacing between the anilox roller 40 and the over roller 30 is as follows: first, in the process of winding the material strip 80 to form a battery cell, the offset of the pole ear 801 is determined; then, the spacing compensation value between the anilox roller 40 and the over roller 30 is determined according to the offset of the pole ear 801; finally, the spacing between the anilox roller 40 and the over roller 30 is adjusted according to the above spacing compensation value. After the spacing between the anilox roller 40 and the over roller 30 changes, the roller pressure of the anilox roller 40 on the material strip 80 changes, and the thickness of the material strip 80 also changes accordingly, so that in the process of winding to form a battery cell, the position of the pole ear 801 can be corrected and the offset of the pole ear 801 can be reduced.

[0088] Figure 5 Another schematic flow chart of a method for adjusting the alignment of tabs provided in an embodiment of the present invention is as follows: Figure 5As shown, in one embodiment, the above-mentioned tab alignment adjustment method further includes:

[0089] Step 106: Determine a preset distance between two adjacent tabs 801 corresponding to the die-cutting device 20;

[0090] Step 107: determining the measured distance between two adjacent tabs 801 after the material strip 80 is cut;

[0091] Step 108: Determine calibration information of the die-cutting device 20 according to the preset spacing and the measured spacing.

[0092] In the above step 106, the "preset spacing" refers to the spacing value between two adjacent pole tabs 801 corresponding to the current die-cutting parameters of the die-cutting device 20 after the die-cutting parameters of the die-cutting device 20 are adjusted, and the preset spacing is a theoretical value. Specifically, the "preset spacing" may refer to the spacing value between two adjacent pole tabs 801 corresponding to the adjustment of the parameters of the die-cutting device 20 according to the first pole tab spacing compensation value, or may refer to the spacing value between two adjacent pole tabs 801 corresponding to the adjustment of the parameters of the die-cutting device 20 according to the second pole tab spacing compensation value. The measured spacing is the spacing value between two adjacent pole tabs 801 after the material strip 80 is cut according to the above-mentioned die-cutting parameters, and the measured spacing is the actual value. By comparing the theoretical value with the actual value, the parameters of the die-cutting device 20 can be calibrated, thereby reducing the difference between the theoretical value and the actual value and improving the accuracy of the die-cutting device 20.

[0093] In one embodiment, in step 107, determining the measured distance between two adjacent tabs 801 after the material strip 80 is cut specifically includes:

[0094] Acquire an image of the cut material strip 80;

[0095] Determine the distance between two adjacent pole ears 801 in the image, which is recorded as a first distance;

[0096] The measured distance is determined according to the corresponding relationship between the first distance and the measured distance.

[0097] In a specific implementation, the image of the material strip 80 can be collected by an image acquisition device. Optionally, the image acquisition device can be a CCD.

[0098] In one embodiment, the multiple pole lugs 801 included in the material strip 80 include a reference pole lug 8011 and a first pole lug 8012, the reference pole lug 8011 is the nth pole lug in the material strip 80, and the first pole lug 8012 is the n+kth pole lug in the material strip 80. Wherein, 1≤n≤m, 1≤k≤mn, and m is the total number of pole lugs included in the material strip 80. Optionally, the value of n can be 1. In this case, the reference pole lug 8011 is the first pole lug of the material strip 80. n can also take other values ​​greater than 1 and less than m. In this case, the reference pole lug 8011 is a pole lug located in the middle area of ​​the material strip 80.

[0099] The winding needle 60 includes a winding needle and a detection assembly. The winding needle is used to wind the material strip 80 and the separator 90 to form a battery cell. The surrounding side of the winding needle 60 has a detection station. When the material strip 80 is wound on the winding needle 60, the reference pole tab 8011 and the first pole tab 8012 pass through the detection station in sequence.

[0100] When at least one of the thickness of the material strip 80 and the thickness of the diaphragm 90 changes, the radius of the wound battery cell will change. When the spacing between the reference pole tab 8011 and the first pole tab 8012 remains unchanged, the center angle of the two pole tabs will change. The winding speed of the winding needle 60 is a constant value, so the time difference between the reference pole tab 8011 and the first pole tab 8012 passing through the detection station will change, so that the offset of the first pole tab 8012 can be determined based on the change of the above time difference and the winding speed of the winding needle 60.

[0101] Specifically, the above-mentioned method for determining the offset mainly includes the following steps:

[0102] Obtaining a time difference ΔT when the reference pole tab 8011 and the first pole tab 8012 sequentially pass through the detection station;

[0103] The offset of the tab 801 is determined according to the time difference ΔT, the standard time difference ΔT0 and the winding speed of the winding needle 60 .

[0104] The standard time difference ΔT0 is the time difference when the reference electrode tab 8011 and the first electrode tab 8012 pass through the inspection station in sequence during the process of forming the standard battery cell.

[0105] In a specific embodiment, the time when the reference tab 8011 passes through the detection station can be obtained, recorded as the first time T1; the time when the first tab 8012 passes through the detection station can also be obtained, recorded as the second time T2; then ΔT=T2-T1.

[0106] In a specific implementation, the detection station is provided with a detection device, and when the tab 801 passes through the detection station, the detection device can detect the tab 801. Optionally, the detection device includes a photoelectric sensor.

[0107] In another embodiment, the offset of the tab can also be determined by:

[0108] Acquire an image of the battery cell during the process of winding the material strip 80 to form the battery cell;

[0109] Determine the actual distribution of the tabs 801 in the image;

[0110] The offset of the pole lugs 801 is determined according to the actual distribution of the pole lugs 801 and the standard distribution of the pole lugs 801 .

[0111] In a specific implementation, the image of the battery cell can be collected by an image acquisition device. Optionally, the image acquisition device can be a CCD.

[0112] Based on the same technical concept, an embodiment of the present invention further provides an adjustment device 70 . Figure 6 A schematic diagram of a composition of an adjusting device provided in an embodiment of the present invention is shown as follows: Figure 6 As shown, in one embodiment, the adjusting device 70 includes:

[0113] The first determination module 701 is used to determine the offset of the tab 801 during the process of winding the material strip 80 to form a battery cell;

[0114] A first compensation module 702 is used to determine a spacing compensation value between two adjacent tabs 801 according to the offset of the tab 801 if the absolute value of the offset of the tab 801 is greater than a first threshold value and less than a second threshold value; the spacing compensation value can be recorded as a first tab spacing compensation value;

[0115] The second compensation module 703 is used to determine the spacing compensation value between the anilox roller 40 and the roller 30 according to the offset if the absolute value of the offset of the pole ear 801 is greater than or equal to the second threshold.

[0116] In the process of adjusting the alignment of the tab 801 by the adjustment device 70, if the absolute value of the offset of the tab 801 is greater than the first threshold value and less than the second threshold value, it means that the offset of the tab 801 is relatively small. Since the cutting accuracy of the die-cutting device 20 is high, the smaller offset of the tab 801 can be adjusted. When the offset of the tab 801 meets the above range, the first compensation module 702 can determine the spacing compensation value between two adjacent tabs 801 to improve the offset of the tab 801 in a way of compensating the spacing between the two adjacent tabs 801.

[0117] In specific implementation, the die-cutting device 20 can finely adjust the die-cutting parameters according to the first pole ear spacing compensation value, so that the spacing between two adjacent pole ears 801 in the multiple pole ears 801 re-formed by cutting the material strip 80 also changes accordingly, thereby effectively improving the offset of the pole ears 801.

[0118] If the absolute value of the offset of the pole lug 801 is greater than or equal to the second threshold, it means that the offset of the pole lug 801 is relatively large. The spacing between the anilox roller 40 and the over roller 30 has a large range of variation, so that the thickness of the material strip 80 has a large range of variation, which can effectively offset the large offset of the pole lug 801. Therefore, when the absolute value of the offset of the pole lug 801 is greater than or equal to the second threshold, the spacing compensation value between the anilox roller 40 and the over roller 30 can be determined by the second compensation module 703. After compensating the spacing between the anilox roller 40 and the over roller 30 according to the spacing compensation value, the roller pressure of the anilox roller 40 on the material strip 80 is changed, so that the thickness of the material strip 80 is changed, and the offset of the pole lug 801 is improved by compensating the thickness of the material strip 80.

[0119] Figure 7 Another schematic diagram of the composition of the regulating device 70 provided in the embodiment of the present invention is as follows: Figure 7 As shown, in one embodiment, the adjustment device 70 further includes:

[0120] A first acquisition module 704 is used to acquire a standard thickness of the material strip 80 and an actual thickness of the material strip 80 before cutting;

[0121] The third compensation module 705 is used to determine the spacing compensation value between two adjacent pole ears 801 according to the standard thickness of the material strip 80 and the above-mentioned actual thickness if the absolute value of the difference between the standard thickness of the material strip 80 and the above-mentioned actual thickness is greater than or equal to the third threshold value; the spacing compensation value can be recorded as the second pole ear spacing compensation value.

[0122] In the above embodiment, after the second pole ear spacing compensation value is determined by the third compensation module 705, the parameters of the die-cutting device 20 can be adjusted according to the second pole ear spacing compensation value, so that the distance between two adjacent pole ears 801 in the multiple pole ears 801 re-formed by cutting the material strip 80 through the die-cutting device 20 changes accordingly, thereby improving the phenomenon of the pole ears 801 being offset due to the change in the thickness of the material strip 80 during the winding process to form the battery cell.

[0123] Figure 8 Another schematic diagram of the composition of the regulating device provided in the embodiment of the present invention is as follows: Figure 8 As shown, in one embodiment, the adjustment device 70 further includes:

[0124] The second acquisition module 706 is used to acquire a preset distance between two adjacent tabs 801 corresponding to the die-cutting device 20;

[0125] The second determination module 707 is used to determine the measured distance between two adjacent tabs 801 after the material strip 80 is cut;

[0126] The calibration module 708 is used to determine the calibration information of the die-cutting device 20 according to the preset spacing and the measured spacing.

[0127] In the above embodiment, the preset spacing is the theoretical value of the spacing between two adjacent tabs 801, and the measured spacing is the actual value of the spacing between two adjacent tabs 801. By comparing the theoretical value with the actual value, the parameters of the die-cutting device 20 can be calibrated, thereby reducing the difference between the theoretical value and the actual value and improving the accuracy of the die-cutting device 20.

[0128] In a specific embodiment, the second determining module 707 is specifically used to:

[0129] Acquire an image of the cut material strip 80;

[0130] Determine the distance between two adjacent pole ears 801 in the image, which is recorded as a first distance;

[0131] The measured distance is determined according to the corresponding relationship between the first distance and the measured distance.

[0132] In a specific embodiment, the multiple pole lugs 801 included in the material strip 80 include a reference pole lug 8011 and a first pole lug 8012, the reference pole lug 8011 is the nth pole lug in the material strip 80, and the first pole lug 8012 is the n+kth pole lug in the material strip 80. Wherein, 1≤n≤m, 1≤k≤mn, and m is the total number of pole lugs included in the material strip 80. Optionally, the value of n can be 1. In this case, the reference pole lug 8011 is the first pole lug of the material strip 80. n can also take other values ​​greater than 1 and less than m. In this case, the reference pole lug 8011 is a pole lug located in the middle area of ​​the material strip 80.

[0133] The winding needle 60 includes a winding needle and a detection assembly. The winding needle is used to wind the material strip 80 and the separator 90 to form a battery cell. The surrounding side of the winding needle 60 has a detection station. When the material strip 80 is wound on the winding needle 60, the reference pole tab 8011 and the first pole tab 8012 pass through the detection station in sequence.

[0134] Based on the above information, the first determining module 701 is specifically used to:

[0135] Determine the time difference ΔT when the reference pole tab 8011 and the first pole tab 8012 pass through the detection station in sequence;

[0136] The offset of the tab 801 is determined according to the time difference ΔT, the standard time difference ΔT0 and the winding speed of the winding needle 60 .

[0137] The standard time difference ΔT0 is the time difference when the reference electrode tab 8011 and the first electrode tab 8012 pass through the inspection station in sequence during the process of forming the standard battery cell.

[0138] Based on the same technical concept, an embodiment of the present application also provides a winding system. Fig. 9 Another structural schematic diagram of the winding system provided by the embodiment of the present invention is as follows Fig. 9 As shown, in one embodiment, the winding system includes an adjustment device 70 in addition to the unwinding roller 10, the die-cutting device 20, the over roller 30, the anilox roller 40 and the winding needle 60. The die-cutting device 20 is connected to the adjustment device 70, and the die-cutting device 20 can adjust the distance between two adjacent pole ears 801 according to the distance compensation value between two adjacent pole ears 801 determined by the adjustment device 70. The driving device 50 is also connected to the adjustment device 70, and is used to adjust the distance between the anilox roller 40 and the over roller 30 according to the distance compensation value between the anilox roller 40 and the over roller 30 determined by the adjustment device 70.

[0139] In one embodiment, the surface of the anilox roller 40 has a plurality of convex hulls, the surface of the convex hulls is a spherical surface, the diameter of the convex hulls is D, and D satisfies the following relationship: 3.0 mm ≤ D ≤ 3.5 mm. Optionally, the value of D can be 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, or other values ​​satisfying the above range, which are not listed one by one in this application.

[0140] The height of the convex hull from the surface of the anilox roller 40 is H, and H satisfies the following relationship: 1.0 mm ≤ H ≤ 1.5 mm. Optionally, the value of H can be 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or other values ​​satisfying the above range, which are not listed one by one in this application.

[0141] When the plurality of convex humps are specifically arranged, the plurality of convex humps are closely arranged along the circumference of the anilox roller 40 , and the plurality of convex humps are arranged in a plurality of rows along the axial direction of the anilox roller 40 , and two adjacent rows are staggered.

[0142] In one embodiment, the winding system further includes a thickness detection device and a frame, wherein the thickness detection device is used to detect the actual thickness of the material strip 80 before cutting, and the thickness detection device is located outside the frame. One or more of the unwinding roller 10, the die-cutting device 20, the passing roller 30, the anilox roller 40, the driving device 50 and the winding needle 60 are arranged on the frame. The adjusting device 70 is connected to the thickness measuring device to obtain the actual thickness of the material strip 80.

[0143] In the above embodiment, by arranging the thickness detection device outside the frame, the influence of the vibration of the frame on the detection accuracy of the thickness detection device is reduced, and the accuracy of thickness measurement is improved.

[0144] When the thickness detection device is installed, the thickness detection device is fixed to the ground through a support frame. Optionally, the support frame includes a support platform and a plurality of support columns, and the plurality of support columns can form a stable support for the support platform, and the thickness detection device is fixed to the support platform.

[0145] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for adjusting the alignment of a tab, characterized in that: Applied to a winding system; the winding system comprises a die-cutting device, an anilox roller, a passing roller and a winding needle; the die-cutting device is used to cut the material strip so that the material strip has a plurality of pole ears; the anilox roller and the passing roller are located between the die-cutting device and the winding needle, and there is a gap between the anilox roller and the passing roller for the material strip to pass through, and the anilox roller is used to roll the material strip when the material strip passes through the gap; The winding needle is used to wind the material strip and the diaphragm to form a battery core; The method for adjusting the alignment of the tabs comprises: Determining an offset of the tab; If the absolute value of the offset is greater than a first threshold value and less than a second threshold value, determining a spacing compensation value between two adjacent tabs according to the offset; If the absolute value of the offset is greater than or equal to the second threshold, a spacing compensation value between the anilox roller and the transfer roller is determined according to the offset.

2. The method for adjusting the alignment of the tabs according to claim 1, wherein: Before determining the offset of the tab, the method further includes: Obtaining the standard thickness of the material strip and the actual thickness of the material strip before cutting; If the absolute value of the difference between the standard thickness of the material strip and the actual thickness is greater than or equal to a third threshold, determining a spacing compensation value between two adjacent tabs according to the standard thickness of the material strip and the actual thickness; The standard thickness of the material strip is the thickness of the material strip in a standard battery cell before cutting.

3. The method for adjusting the alignment of the tabs according to claim 1 or 2, characterized in that: Also includes: Obtaining a preset distance between two adjacent tabs corresponding to the die-cutting device; Determine the measured distance between two adjacent tabs; The calibration information of the die-cutting device is determined according to the preset spacing and the measured spacing.

4. The method for adjusting the alignment of the tabs according to claim 3, characterized in that: The step of determining the measured distance between two adjacent tabs specifically includes: Acquire an image of the material strip after cutting; Determine a distance between two adjacent pole tabs in the image, recorded as a first distance; The measured distance is determined according to a corresponding relationship between the first distance and the measured distance.

5. The method for adjusting the alignment of the tabs according to claim 1 or 2, characterized in that: The plurality of tabs included in the material strip include a reference tab and a first tab, the reference tab is the nth tab in the material strip, the first tab is the n+kth tab in the material strip, 1≤n≤m, 1≤k≤mn, m is the total number of tabs included in the material strip; a detection station is provided on the circumference of the winding needle, and the reference tab and the first tab pass through the detection station in sequence during the process of winding the material strip on the winding needle; Determining the offset of the tab specifically includes: Determining a time difference when the reference electrode tab and the first electrode tab sequentially pass through the detection station; Determining the offset of the tab according to the time difference, the standard time difference and the winding speed of the winding needle; The standard time difference is the time difference when the reference electrode tab and the first electrode tab pass through the detection station in sequence during the process of forming a standard battery cell.

6. A regulating device, characterized in that: include: A first determination module, used to determine the offset of the tab; A first compensation module, configured to determine a spacing compensation value between two adjacent tabs according to the offset if the absolute value of the offset is greater than a first threshold and less than a second threshold; The second compensation module is configured to determine a compensation value for the spacing between the anilox roller and the transfer roller according to the offset if the absolute value of the offset is greater than or equal to the second threshold.

7. The adjusting device according to claim 6, characterized in that Also includes: A first acquisition module, used for acquiring the standard thickness of the material strip and the actual thickness of the material strip before cutting; A third compensation module, configured to determine a spacing compensation value between two adjacent tabs according to the standard thickness of the material strip and the actual thickness if the absolute value of the difference between the standard thickness of the material strip and the actual thickness is greater than or equal to a third threshold; The standard thickness of the material strip is the thickness of the material strip in a standard battery cell before cutting.

8. The adjusting device according to claim 6 or 7, characterized in that: Also includes: A second acquisition module, used for determining a preset distance between two adjacent tabs corresponding to the die-cutting device; A second acquisition module is used to determine the measured distance between two adjacent tabs; A calibration module is used to determine calibration information of the die-cutting device according to the preset spacing and the measured spacing.

9. The adjusting device according to claim 8, characterized in that The second acquisition module is specifically used for: Acquire an image of the material strip after cutting; Determine a distance between two adjacent pole tabs in the image, recorded as a first distance; The measured distance is determined according to a corresponding relationship between the first distance and the measured distance.

10. The adjusting device according to claim 6 or 7, characterized in that: The plurality of tabs included in the material strip include a reference tab and a first tab, the reference tab is the nth tab in the material strip, the first tab is the n+kth tab in the material strip, 1≤n≤m, 1≤k≤mn, m is the total number of tabs included in the material strip; a detection station is provided on the circumference of the winding needle, and the reference tab and the first tab pass through the detection station in sequence during the process of winding the material strip on the winding needle; The first determining module is specifically used for: Determining a time difference when the reference electrode tab and the first electrode tab sequentially pass through the detection station; Determining the offset of the tab according to the time difference, the standard time difference and the winding speed of the winding needle; The standard time difference is the time difference when the reference electrode tab and the first electrode tab pass through the detection station in sequence during the process of forming a standard battery cell.

11. A winding system, characterized in that: It comprises a die-cutting device, a roller, an anilox roller, a driving device, a winding needle and an adjusting device as claimed in any one of claims 6 to 10; The die-cutting device is used to cut the material strip so that the material strip forms a plurality of pole ears; the die-cutting device is connected to the adjusting device and is used to adjust the distance between two adjacent pole ears according to the distance compensation value between the two adjacent pole ears determined by the adjusting device; The anilox roller and the over roller are located between the die-cutting device and the winding needle, and there is a gap between the anilox roller and the over roller for the material tape to pass through, and the anilox roller is used to roll the material tape when the material tape passes through the gap; The driving device is connected to the adjusting device and is used to adjust the distance between the anilox roller and the passing roller according to the distance compensation value between the anilox roller and the passing roller determined by the adjusting device; The winding needle is used to wind the material strip and the separator to form a battery cell.

12. The winding system according to claim 11, characterized in that The surface of the anilox roller has a plurality of convex hulls, the surface of the convex hulls is a spherical surface, the diameter of the convex hulls is D, and D satisfies the following relationship: 3.0 mm ≤ D ≤ 3.5 mm; The height of the convex hull from the surface of the anilox roller is H, and H satisfies the following relationship: 1.0 mm≤H≤1.5 mm.

13. The winding system according to claim 11, characterized in that Also included is a thickness measuring device and a frame; The thickness detection device is used to detect the actual thickness of the material strip before cutting, and the thickness detection device is arranged outside the frame; One or more of the die-cutting device, the roller, the anilox roller, the driving device and the winding needle are arranged on the frame; The adjusting device is connected to the thickness measuring device and is used to obtain the actual thickness of the material strip.

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