A method for preparing defective single coils in a continuous winding process

Abstract

The present application discloses a method for preparing a defective single roll in a continuous winding process, the method comprising: detecting whether there is a defect on any one of a cathode electrode sheet, a separator sheet, and an anode electrode sheet; if the defect is detected on the separator sheet or the anode electrode sheet, skipping a first set length of an anode electrode sheet segment at a preset position of the anode electrode sheet to form a first set length of anode electrode tab-free segment; and stacking a second set length of a separator sheet segment and the first set length of the anode electrode tab-free segment and winding them to form a first defective single roll, wherein the defect is located in the first defective single roll; and if the defect is detected on the cathode electrode sheet, winding the cathode electrode sheet segment with the defect to form a second defective single roll. The present application can reduce strip loss.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a method for preparing a defective single roll in a continuous winding process. Background Art

[0002] Continuous winding equipment is a battery cell production and processing equipment with high winding efficiency. The so-called continuous winding means that after the winding of a battery cell is completed, only the cathode plate needs to be inserted, and the anode plate does not need to be inserted again, and the next battery cell can be wound again.

[0003] In related technologies, battery cells are typically wound from a composite tape consisting of a stack of cathode, diaphragm, and anode strips, each with tabs cut out. If any of these strips has a defect, the defective strip must be removed. However, because defects occur randomly, the defective strip is often stacked with other normal strips and wound together to form a defective cell roll. This defective cell roll, considered a defective product, can lead to significant strip loss. Summary of the Invention

[0004] In response to the above-mentioned deficiencies in the related art, the present application provides a method for preparing a defective single roll in a continuous winding process to solve the problem of large material strip loss in the related art.

[0005] In order to solve the above technical problems, in a first aspect, the present application provides a method for preparing a defective single roll in a continuous winding process, the method comprising:

[0006] Detect whether there is any defect on any of the cathode electrode strip, the diaphragm strip, and the anode electrode strip;

[0007] If the defect is detected on the diaphragm material strip or the anode electrode sheet material strip, a first set length of the anode material strip segment is skipped at a preset position of the anode electrode sheet material strip to form a first set length of the anode electrode tab-free material strip segment, a second set length of the diaphragm material strip segment and the first set length of the anode electrode tab-free material strip segment are stacked and wound to form a first defective single roll, and the defect is located in the first defective single roll;

[0008] If the defect is detected on the cathode electrode sheet, the cathode electrode sheet segment with the defect is wound to form a second defective single roll.

[0009] In a possible implementation of the first aspect, the second set length is greater than or equal to the first set length.

[0010] In a possible implementation of the first aspect, the length of the combined material strip segment wound to form a battery cell is the battery cell material strip length, and a warning mark is provided on the diaphragm material strip at least one battery cell material strip length away from the defect in the conveying direction of the diaphragm material strip, and the warning mark is used to detect whether the defect exists on the diaphragm material strip.

[0011] In a possible implementation of the first aspect, when the warning mark on the diaphragm material strip is detected, after cutting out the anode tab material strip segment of the at least one battery core material strip length from the anode electrode sheet material strip, skip cutting is performed to form the anode tab-free material strip segment;

[0012] The second set length is greater than the first set length, and the defect is located in the diaphragm material strip section of the second set length.

[0013] In a possible implementation of the first aspect, when the defect is detected on the anode electrode sheet strip, a jump cut is performed on the anode electrode sheet strip to form the anode tab-free strip segment, and the defect is located in the anode tab-free strip segment;

[0014] The second set length is equal to the first set length.

[0015] In a possible implementation of the first aspect, the length of the second defective single roll is independent of the length of the first defective single roll.

[0016] In a possible implementation of the first aspect, the first set length is less than the length of the combined material strip segment wound to form a battery cell.

[0017] In a possible implementation manner of the first aspect, the defect is detected using an optical charge-coupled device or a visual element.

[0018] Compared with the related art, this application has at least the following beneficial effects:

[0019] In the present application, when there are defects on the diaphragm material strip or the anode electrode sheet material strip, the diaphragm material strip segment of the second set length and the anode electrode tab-free material strip segment of the first set length will be stacked and wound to form a first defective single roll. Therefore, in this case, the defective single roll is only composed of the diaphragm material strip segment and the anode electrode tab-free material strip segment, and the cathode electrode sheet material strip segment will not constitute a defective single roll. In this way, on the one hand, the cathode electrode sheet material segment can still continue to be used and will not be wasted due to winding to form a defective single roll, which is beneficial to reducing the waste and loss of the material strip; on the other hand, since the anode electrode tab-free material strip segment is a material strip segment without a tab, the anode electrode tab-free material strip segment can still be reused. Even if the anode electrode tab-free material strip segment contains defects, the remaining material strip portion without defects on the anode electrode tab-free material strip segment can also be reused. In this way, compared with the related art, the anode electrode tab material strip segment will not be unable to be reused because it becomes a scrap product with a tab, which is beneficial to further reduce the waste and loss of the material strip.

[0020] When there are defects on the cathode electrode sheet, the defective cathode electrode sheet segment will be wound to form a second defective single roll. Therefore, in this case, the defective single roll is only composed of the cathode electrode sheet segment, and the diaphragm segment and the anode tab segment will not constitute a defective single roll. In this way, the diaphragm segment and the anode tab segment can still be used, and there will be no waste due to the formation of defective single rolls due to winding, which is beneficial to reduce the waste and loss of the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A flow chart of a method for preparing a defective single roll in a continuous winding process provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a defect on a cathode electrode strip provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of a defect on a diaphragm material strip provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a defect on the anode strip provided in an embodiment of the present application;

[0026] Figure 5 Schematic diagram of the continuous winding equipment provided in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1- cathode electrode strip; 11- cathode tab; 12- cathode electrode strip segment;

[0029] 2-diaphragm strip;

[0030] 3- anode electrode strip; 31- anode tab; 32- anode tab-free strip segment;

[0031] 4-defects;

[0032] 5- Warning signs;

[0033] 6-Photoelectric charge-coupled device;

[0034] 7-winding equipment; 71-cathode electrode sheet unwinding device; 72-anode electrode sheet unwinding device; 73-first diaphragm unwinding device; 74-second diaphragm unwinding device; 75-film combining device; 76-winding device; 761-winding needle; 762-cutter; 77-cathode tab cutting device; 78-anode tab cutting device. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0037] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0040] As described in the background technology of this application, in the related technology, the continuous winding equipment is a battery cell production and processing equipment with high winding efficiency. The so-called continuous winding means that after the winding of a battery cell is completed, only the cathode electrode needs to be inserted, and the anode electrode does not need to be inserted again, and the winding of the next battery cell can be carried out again.

[0041] In related technologies, battery cells are typically wound from a composite tape consisting of a stack of cathode, diaphragm, and anode strips, each with tabs cut out. If any of these strips has a defect, the defective strip must be removed. However, because defects occur randomly, the defective strip is often stacked with other normal strips and wound together to form a defective cell roll. This defective cell roll, considered a defective product, can lead to significant strip loss.

[0042] In view of the above-mentioned problems, the present application provides a method for preparing a defective single roll in a continuous winding process to solve the problem of large material strip loss in the related art.

[0043] The technical solution of this application will be further described below with reference to specific embodiments and drawings:

[0044] Figure 1 Flowchart of a method for preparing a defective single roll in a continuous winding process provided in an embodiment of the present application, the method comprising:

[0045] Step 101 : Detect whether there is a defect 4 on any one of the cathode electrode strip 1 , the diaphragm strip 2 and the anode electrode strip 3 .

[0046] Step 1021: See Figure 3 and Figure 4If a defect 4 is detected on the diaphragm material strip 2 or the anode electrode sheet material strip 3, an anode material strip segment of a first set length L1 is cut at a preset position of the anode electrode sheet material strip 3 to form an anode tab-free material strip segment 32 of a first set length L1. The diaphragm material strip segment of a second set length and the anode tab-free material strip segment 32 of the first set length L1 are stacked and wound to form a first defective single roll, and the defect 4 is located in the first defective single roll.

[0047] Step 1022: See Figure 2 If a defect 4 is detected on the cathode electrode strip 1, the cathode electrode strip segment 12 with the defect 4 is wound to form a second defective single roll.

[0048] In the present application, when there is a defect 4 on the diaphragm material strip 2 or the anode electrode sheet material strip 3, the diaphragm material strip segment of the second set length and the anode electrode ear material strip segment 32 of the first set length L1 will be stacked and wound to form a first defective single roll. Therefore, in this case, the defective single roll is only composed of the diaphragm material strip segment and the anode electrode ear material strip segment 32, and the cathode electrode sheet material segment will not constitute a defective single roll. In this way, on the one hand, the cathode electrode sheet material segment can still be used, and will not be wasted due to the formation of a defective single roll due to winding, which is beneficial. On the other hand, since the anode tab-free strip segment 32 is a strip segment without a tab, the anode tab-free strip segment 32 can still be reused. Even if the anode tab-free strip segment 32 contains a defect 4, the remaining strip portion of the anode tab-free strip segment 32 that does not contain the defect 4 can also be reused. Compared with the related art, the anode tab strip segment will not become a scrapped product with a tab and cannot be reused, which is beneficial to further reduce the waste and loss of the strip.

[0049] Since there is a defect 4 on the cathode electrode sheet material strip 1, the cathode electrode sheet material strip segment 12 with the defect 4 will be wound to form a second defective single roll. Therefore, in this case, the defective single roll is only composed of the cathode electrode sheet material strip segment 12, and the diaphragm material strip segment and the anode tab material strip segment will not constitute a defective single roll. In this way, the diaphragm material strip segment and the anode tab material strip segment can still be used, and there will be no waste due to the formation of a defective single roll due to winding, which is beneficial to reduce the waste and loss of the material strip.

[0050] Regarding the relationship between the first set length L1 and the second set length, further, the second set length is greater than or equal to the first set length L1.

[0051] Since no processing will be performed on the diaphragm strip 2, setting the second set length to be greater than or equal to the first set length L1 will not affect the secondary use of the diaphragm strip segment in the defective single roll, and will also facilitate the winding formation of the defective single roll.

[0052] Furthermore, if Figure 3As shown, the length of the combined strip segment wound to form a battery cell is the battery cell strip length L, and the length of the separator strip 2 is in the direction of conveying the separator strip 2 ( Figure 3 At least one of the above-mentioned battery core strips is provided with a warning mark 5 at a length L, and the warning mark 5 is used to detect whether there is a defect 4 on the diaphragm strip 2.

[0053] Since there is a reaction time between detecting the defect 4 and performing the jump-cut action, and since there is at least one battery cell strip length L between the warning mark 5 and the defect 4, detecting the defect 4 on the diaphragm strip 2 through the warning mark 5 can reduce the influence of the reaction time on the jump-cut action, which is beneficial to ensuring the position accuracy of the jump-cut action on the anode electrode strip 3.

[0054] Regarding the number of the above-mentioned battery core strip lengths L, in a preferred embodiment, Figure 3 As shown, there is only one cell strip length L between the warning mark 5 and the defect 4. This arrangement not only ensures sufficient time to react to the action of cutting the anode tab-free strip segment 32, but also avoids affecting the accuracy of the position of the anode tab-free strip segment 32 on the anode strip 3 due to the long distance between the warning mark 5 and the defect 4.

[0055] In other embodiments, there may be two, three, or more battery core strip lengths L between the warning mark 5 and the defect 4. The number of battery core strip lengths L between the warning mark 5 and the defect 4 is flexible and can be set according to actual usage requirements. This embodiment of the present application will not be elaborated on in detail.

[0056] Furthermore, the warning mark 5 is manually pasted on the diaphragm material strip 2 .

[0057] Such a setting not only simplifies the setting method of the warning mark 5 on the diaphragm material strip 2, but also allows people to flexibly judge the position of the warning mark 5 on the diaphragm material strip 2, making the setting of the warning mark 5 on the diaphragm material strip 2 more flexible.

[0058] In other embodiments, after the diaphragm strip 2 is processed, the warning mark 5 can also be affixed to the diaphragm strip 2 using mechanical equipment. In this way, using mechanical equipment to affix the warning mark 5 is conducive to improving the efficiency of affixing the warning mark 5, thereby improving the production efficiency of the electric coil.

[0059] Furthermore, if a defect 4 is detected on the separator strip 2, in this case, for the formation of the anode-free tab strip segment 32, in a preferred embodiment, as shown in FIG. Figure 3As shown, when the warning mark 5 on the diaphragm material strip 2 is detected, after cutting out at least one anode tab material strip segment of the battery core material strip length L on the anode electrode material strip 3, the anode tab-free material strip segment 32 is formed by skipping the cutting.

[0060] The second set length is greater than the first set length L1 , and the defect 4 is located in the diaphragm material strip section of the second set length.

[0061] Since there is at least one battery cell strip length L between the warning mark 5 and the defect 4, there is sufficient time to react to the action of cutting the anode-free tab strip segment 32 after the warning mark 5 is detected. This is conducive to ensuring the accuracy of the position of the anode-free tab strip segment 32 on the anode electrode strip 3, and further conducive to ensuring that the defect 4 can be located within the corresponding range of the anode-free tab strip segment 32, which is conducive to ensuring that the defect 4 exists in the defective single roll.

[0062] In this case, setting the second set length to be greater than the first set length L1 can ensure that the defect 4 is located in the diaphragm strip section of the second set length, and also facilitates the winding formation of the first defective single roll.

[0063] If a defect 4 is detected on the diaphragm material strip 2, in this case, for the formation method of the anode tab-free material strip segment 32, in another embodiment, when a defect 4 is detected on the diaphragm material strip 2, a jump cut is made on the anode electrode sheet material strip 3 to form the anode tab-free material strip segment 32.

[0064] With this arrangement, after detecting the presence of a defect 4 on the separator strip 2, anode tab-free strip segments 32 can be formed on the anode tab strip 3 in a relatively short period of time. This improves the efficiency of forming the anode tab-free strip segments 32, thereby facilitating improved cell production efficiency. Furthermore, since there is no need to provide the warning mark 5 on the separator strip 2, the manufacture of the separator strip 2 is facilitated, thereby improving cell manufacturing efficiency.

[0065] If a defect 4 is detected on the anode electrode strip 3, in the preferred embodiment, the formation method of the anode tab-free strip segment 32 is as follows: Figure 4 As shown, when a defect 4 is detected on the anode strip 3, the anode strip 3 is cut to form a strip segment 32 without an anode tab, and the defect 4 is located in the strip segment 32 without an anode tab; the second set length is equal to the first set length L1.

[0066] With such an arrangement, after a defect 4 is detected on the anode electrode sheet strip 3, the anode electrode sheet strip 3 can be cut to form an anode tab-free strip segment 32 within a relatively short period of time, thereby improving the formation efficiency of the anode tab-free strip segment 32 and further improving the production efficiency of the battery cell.

[0067] If a defect 4 is detected on the anode electrode strip 3, for the formation of the anode tab-free strip segment 32, in another embodiment, the anode electrode strip 3 is moved in the direction of conveying the anode electrode strip 3 ( Figure 3 At least one of the above-mentioned battery core strips is provided with a warning mark 5 at a length L, and the warning mark 5 is used to detect whether there is a defect 4 on the anode electrode strip 3.

[0068] When the warning mark 5 is detected on the anode electrode sheet strip 3, after cutting out at least one anode tab strip segment of the battery cell strip length L on the anode electrode sheet strip 3, the anode tab-free strip segment 32 is formed by skipping the cutting.

[0069] Since there is at least one battery cell strip length L between the warning mark 5 and the defect 4, there is sufficient time to react to the action of cutting the anode-free tab strip segment 32 after the warning mark 5 is detected. This is conducive to ensuring the accuracy of the position of the anode-free tab strip segment 32 on the anode electrode strip 3, and further conducive to ensuring that the defect 4 can be located within the corresponding range of the anode-free tab strip segment 32, which is conducive to ensuring that the defect 4 exists in the defective single roll.

[0070] Regarding the processing method for forming the anode-free tab strip segment 32 , in a preferred embodiment, the anode-free tab strip segment 32 is formed by laser skip cutting.

[0071] Since laser jump cutting has the characteristics of high precision, speed and efficiency, forming the anode-free tab strip segment 32 by laser jump cutting can not only improve the processing efficiency of the anode-free tab strip segment 32, but also ensure the processing accuracy and quality of the anode-free tab strip segment 32.

[0072] Furthermore, regarding the relationship between the length of the second defective single roll and the length of the first defective single roll, in a preferred embodiment, the length of the second defective single roll is independent of the length of the first defective single roll.

[0073] Such an arrangement can reduce the mutual influence and mutual restriction between the second defective single roll and the first defective single roll, and is conducive to facilitating the winding formation of the second defective single roll and the first defective single roll.

[0074] Regarding the first set length L1, further, the first set length L1 is smaller than the length of the combined material strip segment wound to form one battery cell.

[0075] Such an arrangement can make the length of the defective combined tape segment wound to form a defective single roll shorter than the length of the combined tape segment wound to form a battery cell, thereby reducing the amount of tape used in the defective single roll, which is beneficial to further reduce the waste of tape and the loss of tape.

[0076] Furthermore, the first set length L1 is 10.9 m-11.1 m.

[0077] Since the length of the combined material strip segment wound to form a battery cell is usually greater than 20m, the first set length L1 is set to 10.9m-11.1m, so that the first set length L1 is basically only half of the length of the combined material strip segment wound to form a battery cell, which is conducive to further reducing the amount of material strip used in a defective single roll, further reducing the waste of material strip, and further reducing the loss of material strip.

[0078] In the embodiment of the present application, the first set length L1 can be 10.9m, 11m, 11.1m, or any value within the range of 10.9m-11.1m. The setting of the first set length L1 is relatively flexible and can be set according to actual usage requirements. This embodiment of the present application will not be elaborated in detail.

[0079] For the detection of defect 4, in a preferred embodiment, as Figure 2-Figure 4 As shown, the defect 4 is detected using an optical charge-coupled device 6 (CCD) or a visual element.

[0080] Since the charge coupled device 6 or the visual element has the characteristics of high sensitivity, high resolution and high precision, using the charge coupled device 6 or the visual element to detect the defect 4 is beneficial to improving the detection accuracy of the defect 4, thereby helping to avoid missing the defect 4.

[0081] In other embodiments, a CMOS image sensor or a CIS detector may also be used. The detection method of defect 4 is relatively flexible and can be selected according to actual needs. This embodiment of the present application will not be elaborated on in detail.

[0082] like Figure 5 As shown, the present application further provides a winding device 7 , and the method for preparing a defective single roll in the continuous winding process in any of the above embodiments can be implemented based on the winding device 7 .

[0083] In the embodiment of the present application, a method for preparing a defective single roll in a continuous winding process implemented based on the winding device 7 is as follows:

[0084] like Figure 2-Figure 5 As shown, the winding device 7 includes a cathode electrode sheet unwinding device 71, an anode electrode sheet unwinding device 72, a first diaphragm unwinding device 73, a second diaphragm unwinding device 74, a film combining device 75, a winding device 76, a cathode electrode tab cutting device 77, an anode electrode tab cutting device 78 and a charge coupled device 6.

[0085] When the charge coupled device 6 detects a defect 4 on either the diaphragm strip 2 or the anode sheet strip 3, the cathode tab cutting device 77 continues to cut the cathode tab 11 on the cathode sheet strip 1 unwound by the cathode sheet unwinding device 71, and the anode tab cutting device 78 jumps to cut the anode sheet strip 3 unwound by the anode sheet unwinding device 72 to form a first set length L1 of the anode tab-free strip segment 32.

[0086] The anode tab-free material strip segment 32 of the first set length L1, the diaphragm material strip segment of the second set length unwound by the first diaphragm unwinding device 73 and the second diaphragm unwinding device 74 can be superimposed to form a defective combined material strip segment after passing through the film combining device 75, and the defect 4 is located on the defective combined material strip segment. The defective combined material strip segment will be wound on the winding needle 761 of the first station a1 in the winding device 76. After the winding needle 761 moves to the second station a2, the cutter 762 in the winding device 76 can separate the wound defective combined material strip segment from the normal combined material strip, thereby forming a first defective single roll.

[0087] When the charge coupled element 6 detects that there is a defect 4 on the cathode electrode sheet 1, the cathode ear cutting device 77 continues to cut out the cathode ear 11 on the cathode electrode sheet 1 unwound by the cathode electrode sheet unwinding device 71, and the anode ear cutting device 78 continues to cut out the anode ear 31 on the anode electrode sheet 3 unwound by the anode electrode sheet unwinding device 72. The cathode electrode sheet segment 12 with the defect 4 is wound on the winding needle 761 of the first station a1 in the winding device 76 after passing through the film combining device 75. After the winding needle 761 moves to the second station a2, the cutter 762 in the winding device 76 can separate the wound cathode electrode sheet segment 12 with the defect 4 from the normal cathode electrode sheet segment, thereby forming a second defective single roll.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing defective single rolls in a continuous winding process, characterized in that: include: Detecting whether there is a defect (4) on any one of the cathode electrode strip (1), the diaphragm strip (2) and the anode electrode strip (3); If the defect (4) is detected on the diaphragm material strip (2) or the anode electrode sheet material strip (3), a first set length of anode material strip segment is cut at a preset position of the anode electrode sheet material strip (3) to form a first set length of anode tab-free material strip segment (32), a second set length of diaphragm material strip segment and the first set length of anode tab-free material strip segment (32) are stacked and wound to form a first defective single roll, and the defect (4) is located in the first defective single roll; If the defect (4) is detected on the cathode electrode strip (1), the cathode electrode strip section having the defect (4) is wound to form a second defective single roll; The second set length is greater than or equal to the first set length; The length of the combined material strip section wound to form a battery cell is the length of the battery cell material strip, and a warning mark (5) is provided on the diaphragm material strip (2) at least one position of the battery cell material strip length spaced apart from the defect (4) in the conveying direction of the diaphragm material strip (2), and the warning mark (5) is used to detect whether the defect (4) exists on the diaphragm material strip (2); When the warning mark (5) on the diaphragm material strip (2) is detected, after cutting out the anode tab material strip segment of at least one battery core material strip length on the anode electrode sheet material strip (3), jump cutting to form the anode tab-free material strip segment (32); The second set length is greater than the first set length, and the defect (4) is located in the diaphragm material strip section of the second set length.

2. The method for preparing defective single rolls in a continuous winding process according to claim 1, characterized in that: When the defect (4) is detected on the anode electrode sheet material strip (3), a jump cut is performed on the anode electrode sheet material strip (3) to form the anode tab-free material strip segment (32), wherein the defect (4) is located in the anode tab-free material strip segment (32); The second set length is equal to the first set length.

3. The method for preparing defective single rolls in a continuous winding process according to claim 1 or 2, characterized in that: The length of the second defective single roll is independent of the length of the first defective single roll.

4. The method for preparing defective single rolls in a continuous winding process according to claim 1 or 2, characterized in that: The first set length is less than the length of the combined material strip segment wound to form a battery cell.

5. The method for preparing defective single rolls in a continuous winding process according to claim 1 or 2, characterized in that: The defect (4) is detected using an optical charge coupled device (6) or a visual element.

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