Slitting, die cutting and winding integrated device

Abstract

The utility model relates to a slitting, die cutting and winding integrated device which comprises a pole piece unwinding mechanism, a pole piece cutting mechanism and a battery cell winding mechanism which are sequentially arranged in the conveying direction, and a diaphragm unwinding mechanism arranged on the feeding side of the battery cell winding mechanism, the pole piece cutting mechanism comprises a foil slitting module and a pole lug die cutting module which are sequentially arranged in the conveying direction, the foil slitting module is used for cutting and removing redundant foil, and the pole lug die cutting module is used for cutting pole pieces to form pole lugs. According to the technical scheme, the production efficiency is improved, meanwhile, the consistency of the heights of the tabs can be guaranteed, and stage change of the heights of the tabs can be achieved in the mode that the redundant foil is cut off to change the gradient.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery production and manufacturing, and in particular, to a slitting, die-cutting and winding integrated device suitable for cylindrical batteries. Background Art

[0002] In order to improve the efficiency of battery production and manufacturing, some related technologies integrate equipment such as pole piece unwinding, die-cutting and forming, and battery core winding into an integrated device. Before the pole ear is cut, it is necessary to remove the redundant foil outside the pole piece. In the integrated device provided by the related technology, usually only the pole ear die-cutting and forming are carried out, that is, the slitting for removing the redundant foil outside the pole piece is still carried out in the process outside the integrated device, thus increasing the process of loading and unloading the pole piece during the pole ear die-cutting and forming. This process is likely to cause fluctuations in the height of the pole ear and has low production efficiency. Summary of the Utility Model

[0003] To overcome the problems existing in the related technologies, the present disclosure provides a slitting, die-cutting and winding integrated device.

[0004] According to an embodiment of the present disclosure, there is provided a slitting, die-cutting and winding integrated device, including a pole piece unwinding mechanism, a pole piece cutting mechanism and a battery core winding mechanism arranged in sequence along the conveying direction, and a separator unwinding mechanism arranged on the feeding side of the battery core winding mechanism. Among them, the pole piece cutting mechanism includes a foil slitting module and a pole ear die-cutting module arranged in sequence along the conveying direction. The foil slitting module is used for cutting and removing the redundant foil, and the pole ear die-cutting module is used for cutting and forming pole ears on the pole piece.

[0005] Optionally, the foil slitting module and / or the pole ear die-cutting module is a laser cutting machine.

[0006] Optionally, the foil slitting module includes a first cutting control module, and the first cutting control module is used for cutting the gap pole ears, and the first cutting control module is configured to control the laser to run along a predetermined trajectory so as to be able to form pole ears while removing the redundant foil at the position without pole ears.

[0007] Optionally, the foil slitting module includes a second cutting control module, and the second cutting control module is used for cutting the inclined seam pole ears, and the second cutting control module is configured to control the laser to run along a predetermined trajectory so as to be able to first remove the redundant foil outside the pole ears, then slit to form the pole ears, and finally remove the redundant foil at the position without pole ears.

[0008] Optionally, the foil slitting module includes a third cutting control module, and the third cutting control module is used for cutting the inclined seam pole ears, and the third cutting control module is configured to control the laser to run along a predetermined trajectory so as to be able to remove the redundant foil outside the pole ears while removing the redundant foil at the position without pole ears, and then slit to form the pole ears.

[0009] Optionally, the device further includes an alignment detection mechanism disposed adjacent to the battery cell winding mechanism.

[0010] Optionally, the alignment detection mechanism is disposed on one side of the battery cell winding mechanism, and the device further includes a pole piece dressing width detection mechanism disposed between the pole piece cutting mechanism and the battery cell winding mechanism.

[0011] Optionally, a pole piece incoming material detection mechanism and a pole piece deviation rectifying mechanism are further disposed on the discharging side of the pole piece unwinding mechanism.

[0012] Optionally, a separator incoming material detection mechanism and a separator deviation rectifying mechanism are further disposed on the discharging side of the separator unwinding mechanism.

[0013] Optionally, the device further includes an adhesive pasting mechanism disposed adjacent to the battery cell winding mechanism.

[0014] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the device provided by the present disclosure, the pole piece cutting mechanism is respectively integrated with the functions of foil cutting and tab die cutting, that is, through this one mechanism of the pole piece cutting mechanism, the actions of removing the waste edge of the foil and die cutting the tab shape can be simultaneously realized, reducing the buffer process and loss of the pole piece loading and unloading before the tab die cutting and forming. While improving the production efficiency, it is also beneficial to ensure the consistency of the tab height. Moreover, the staged change of the tab height can be realized by cutting the redundant foil to change the gradient. In addition, since there is no need to separately set a cutting process outside the integrated device, it is also beneficial to reduce the equipment cost.

[0015] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure.

[0017] Figure 1 It is a schematic diagram of a slitting, die cutting and winding integrated device provided by an exemplary embodiment of the present disclosure.

[0018] Figure 2 It is a schematic diagram of a pole piece cutting mechanism provided by an exemplary embodiment of the present disclosure.

[0019] Figures 3a to 3c It is a schematic diagram of three different tab cutting paths provided by an exemplary embodiment of the present disclosure.

[0020] Figure 4 It is a schematic diagram of alignment detection provided by an exemplary embodiment of the present disclosure.

[0021] Description of Reference Numerals

[0022] 110 - Pole piece unwinding mechanism, 120 - Pole piece cutting mechanism, 121 - Foil slitting module, 1211 - First cutting control module, 1212 - Second cutting control module, 1213 - Third cutting control module, 122 - Tab die-cutting module, 130 - Battery core winding mechanism, 140 - Diaphragm unwinding mechanism, 150 - Alignment detection mechanism, 160 - Pole piece dressing width detection mechanism, 171 - Pole piece incoming material detection mechanism, 172 - Diaphragm incoming material detection mechanism, 181 - Pole piece deviation correction mechanism, 182 - Diaphragm deviation correction mechanism, 190 - Glue application mechanism, 210 - Empty foil area on one side of the pole piece, 211 - Excess foil, 211a - Excess foil outside the tab, 211b - Excess foil at the tabless position, 212 - Tab, 213 - Foil at the root of the tab, 220 - Pole piece dressing area. Detailed Description of the Embodiment

[0023] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0024] The embodiments described in some of the following embodiments of the present disclosure do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0025] As Figure 1 shown, an exemplary embodiment of the present disclosure provides a slitting, die-cutting and winding integrated device particularly suitable for cylindrical batteries. Specifically, the device includes a pole piece unwinding mechanism 110, a pole piece cutting mechanism 120, and a battery core winding mechanism 130 arranged in sequence along the conveying direction, and a diaphragm unwinding mechanism 140 arranged at the inlet side of the battery core winding mechanism 130. Among them, the pole piece cutting mechanism 120 includes a foil slitting module 121 and a tab die-cutting module 122 arranged in sequence along the conveying direction. The foil slitting module 121 is used to cut and remove excess foil, and the tab die-cutting module 122 is used to cut tabs on the pole piece.

[0026] There are two pole piece unwinding mechanisms 110 and two diaphragm unwinding mechanisms 140. The two pole piece unwinding mechanisms 110 are arranged in the device as Figure 1On the left and right sides in the direction shown in the figure, the positive electrode sheet and the negative electrode sheet are respectively used for unwinding. And the two electrode sheet unwinding mechanisms 110 and the two separator unwinding mechanisms 140 act alternately, so that a battery cell with the positive electrode sheet, the separator, and the negative electrode sheet stacked alternately can be formed.

[0027] A pole piece cutting mechanism 120 is respectively arranged on both sides of the positive electrode and the negative electrode, and a foil cutting module 121 for cutting and removing redundant foil and an ear cutting module 122 for cutting ears on the pole piece are integrated in the pole piece cutting mechanism 120. And the foil cutting module 121 and the ear cutting module 122 are arranged along the transmission direction of the pole piece, so that the redundant foil can be cut first and then the ears can be die-cut. In this way, the foil cutting process and the ear die-cutting process can be carried out continuously on the same mechanism, which further helps to ensure the cutting accuracy. Specifically, it can avoid the problem that the height of the ears is prone to fluctuate due to the long buffer of the pole piece loading and unloading before the ear die-cutting forming in the related technology, which affects the quality of the battery cell. And the present disclosure shortens this kind of buffer and loss, thus reducing or avoiding the risk of the height of the ears fluctuating.

[0028] The amount of foil cut during cutting determines the height of the ears. For example, in the process of multi-layer coating, along the transmission direction, the height of the ears can be changed in stages by controlling the amount of redundant foil cut by the foil cutting module 121, which is beneficial to improving the flexibility of the application of the device of the present disclosure.

[0029] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: In the device provided by the present disclosure, the pole piece cutting mechanism 120 integrates the functions of foil cutting and ear die-cutting respectively, that is, through the pole piece cutting mechanism 120, the actions of removing the waste edge of the foil and die-cutting the ear shape can be realized simultaneously. It reduces the buffer process and loss of the pole piece loading and unloading before the ear die-cutting forming, improves the production efficiency, and is also beneficial to ensuring the consistency of the ear height. And it can also realize the stage change of the ear height by the way of cutting the redundant foil with different gradients. In addition, since there is no need to separately set a cutting process outside the integrated device, it is also beneficial to reduce the equipment cost.

[0030] Improving the cutting accuracy of the pole piece foil is more beneficial to ensuring the consistency of the ear height, that is, the higher the cutting accuracy, the easier it is to ensure the consistency of the ear height. Therefore, in some embodiments, the foil cutting module 121 and / or the ear cutting module 122 adopt a laser cutting machine. The laser cutting machine can achieve more precise cutting according to the predetermined cutting path.

[0031] Tab forming generally adopts the tab with gap solution and the inclined seam tab solution. Correspondingly, the foil slitting module 121 for cutting and removing the redundant foil can be configured to implement one of the tab solutions respectively, or can also be configured to implement both tab solutions simultaneously.

[0032] Reference can be made simultaneously to Figure 2 and Figure 3a . In some embodiments, it is used to implement the tab with gap solution. Among them, the foil slitting module 121 includes a first cutting control module 1211, and the first cutting control module 1211 is configured to control the laser to run along a predetermined trajectory so as to be able to form tabs while removing the redundant foil at the tabless position.

[0033] For the tab with gap solution, the incoming pole piece in the winding process includes an empty foil area 210 on one side of the pole piece and a dressing area 220 of the pole piece. The empty foil area 210 on one side of the pole piece is sequentially divided in the direction away from the dressing into: tab root foil 213, tab 212, and redundant foil 211. When laser die-cutting the tabs, the laser path on the pole piece is Figure 3a shown by the thickened line. The function of the redundant foil 211 is to carry out the empty foil at the tab gap. At this time, the redundant foil 211 is a whole, ensuring the continuity of the collection of the redundant foil 211.

[0034] Reference can be made simultaneously to Figure 2 and Figure 3b . In some embodiments, it is used to implement the inclined seam tab solution. Among them, the foil slitting module 121 includes a second cutting control module 1212, and the second cutting control module 1212 is configured to control the laser to run along a predetermined trajectory so as to be able to first remove the redundant foil 211a outside the tab, then slit to form the tab 212, and finally remove the redundant foil 211b at the tabless position.

[0035] For the inclined seam tab solution, when die-cutting the tab shape, only slits need to be made between the tabs to form parallelogram tabs or rectangular or other shaped tabs. There is no redundant foil between adjacent tabs. Therefore, it is not necessary to use the redundant foil 211a outside the tab to carry out the redundant foil between the tabs like the tab with gap solution. For the redundant empty foil at the tabless area position, it can be cut in advance or removed together when die-cutting the tab shape. Then, a fine slitting process is required to remove the redundant waste edge before laser die-cutting the tabs.

[0036] As Figure 3b shown, laser slitting can only remove the redundant foil. At this time, the cutting path on the pole piece foil is a straight line. Then, during the tab die-cutting process, the actions of slitting in the tab area and removing the redundant foil 211b at the tabless position are alternately carried out.

[0037] Reference can be made simultaneously to Figure 2 and Figure 3c。In another solution of the diagonal slit tab, the foil slitting module 121 includes a third cutting control module 1213, which is configured to control the laser to run along a predetermined trajectory so as to be able to remove the excess foil 211a outside the tab while removing the excess foil 211b at the tabless position, and then slit to form the tab 212.

[0038] While removing the excess foil 211a outside the tab, the foil 211b at the tabless position is removed, including cutting out positioning holes. At this time, the cutting path on the empty foil of the pole piece is approximately a rectangular wave, and all the excess foil 211 is directly removed, ensuring the continuity of waste collection. Correspondingly, when laser die-cutting the tab shape, only slitting is required in the tab area, without the influence of waste edges, improving the quality of laser die-cutting; it is also possible to cut out a stepped shape, an arc shape or other geometric shapes in the tab area while removing the excess foil 211 and the excess foil 211b at the tabless position. There is no limitation here, which is convenient for the tab height to change according to the step height when die-cutting the tab. When reducing the tab height at the front end of the pole piece, it is beneficial to further shorten the length of the tabless position at the front end of the pole piece.

[0039] During the winding process of the battery cell, it is necessary to detect the misalignment value between the edges of the positive and negative pole pieces, the upper and lower diaphragms and other materials of the bare battery cell in real time to ensure the alignment of the material edges. In some embodiments, as Figure 1 shown, the slitting, die-cutting and winding integrated device further includes an alignment detection mechanism 150 disposed adjacent to the battery cell winding mechanism 130. The alignment data can be used to judge whether the pole piece deviates from the central value, and the deviation can be adjusted for rectification before winding. The alignment detection mechanism 150 can be, for example, a CCD camera.

[0040] There is double-sided misalignment in the pole piece coating of the cylindrical battery, and the alignment detection at the winding position generally only sets an alignment detection mechanism 150 on one side of the battery cell winding mechanism 130. This is mainly because if alignment detection mechanisms 150 are set on both sides, the distance between the feeding rectification and the winding needle will be increased, resulting in a large fluctuation in the neatness of the inner circle of the pole core, which makes it impossible to detect and judge the alignment on the other side where the alignment detection mechanism 150 is not set.

[0041] Considering this technical problem, as Figure 1 shown, the slitting, die-cutting and winding integrated device of the present disclosure further includes a pole piece dressing width detection mechanism 160 disposed between the pole piece cutting mechanism 120 and the battery cell winding mechanism 130. The pole piece dressing width detection mechanism 160 can also be a CCD camera. The alignment detection mechanism 150 and the pole piece dressing width detection mechanism 160 are respectively connected to the battery cell winding mechanism 130, and at the same time, using the pole piece dressing width detection data, the alignment on the side where the alignment detection mechanism 150 is not set is calculated, realizing the double-sided alignment detection of the cylindrical battery under the condition of a single-sided alignment detection mechanism 150.

[0042] For details, reference can be made to Figure 4 , where A and B represent the axial dressing widths of the battery cells, with A being the width of the positive electrode material and B being the width of the negative electrode material. The material widths are measured by the electrode sheet dressing width detection mechanism 160 during the transportation of the electrode sheets. A1 and A2, A3 and A4, B1 and B2 respectively represent the material widths of the front and back sides of the electrode sheets. When coating the electrode sheets of cylindrical batteries, there is a double-sided misalignment, so there are situations where A1≠A2, A3≠A4, and B1≠B2. Among them, A1 and A3, A2 and A4 are the material widths of the same side of the adjacent turns of electrode sheets in the battery cell. Generally, it is considered that A1≈A3 and A2≈A4.

[0043] When the alignment detection mechanism 150 is only set on one side, it can only detect the coating data of one side of the positive and negative electrodes, such as the difference between the two ends of A1 and B1 or the difference between the two ends of B2 and A4. Taking the side where only A1 and B1 can be detected as an example, the alignment detection can measure the X and Y values, and determine whether the alignment is qualified by comparing with the standard values. For the side without the alignment detection mechanism 150, that is, the B2 and A4 sides, X1 = X + (B2 - B1), Y1 = Y + (A3 - A4)≈Y + (A1 - A2). Compare X1 and Y1 with the standard values to determine whether the alignment is qualified, ensuring the quality of the battery cell.

[0044] The dressing width data measured by the electrode sheet dressing width detection mechanism 160 are corresponding one by one according to the distance from the winding position. Before winding, the center lines of the positive and negative electrodes and the separator are adjusted in place through the deviation rectification mechanism, ensuring that the electrode sheet coating is centered. It is also possible to judge whether it deviates from the center value according to the alignment data, and adjust the deviation rectification before winding according to the deviation amount.

[0045] As Figure 1 described, an electrode sheet incoming material detection mechanism 171 and an electrode sheet deviation rectification mechanism 181 can also be provided on the discharging side of the electrode sheet unwinding mechanism 110. The electrode sheet incoming material detection mechanism 171 is used to detect whether the incoming material is a defective product, and the electrode sheet deviation rectification mechanism 181 is used to adjust the deviation according to the deviation amount of the electrode sheet before the ear die-cutting is formed. Similarly, a separator incoming material detection mechanism 172 and a separator deviation rectification mechanism 182 can also be provided on the discharging side of the separator unwinding mechanism 140. The separator incoming material detection mechanism 172 is used to detect whether the incoming material is a defective product, and the separator deviation rectification mechanism 182 is used to adjust the deviation according to the deviation amount of the separator before the battery cell is wound. The slitting, die-cutting and winding integrated device of the present disclosure can also include an adhesive pasting mechanism 190 disposed adjacent to the battery cell winding mechanism 130 for pasting the end adhesive after the battery cell is wound. In addition, a blanking detection mechanism can be adaptively provided for detecting the height, diameter, end face, and whether there is a short circuit of the electrode core. The blanking detection mechanism can adopt the conventional configuration in the art and will not be elaborated here.

[0046] The following is an exemplary introduction to the process of manufacturing cylindrical batteries using the slitting, die-cutting, and winding integrated device provided by the present disclosure. After the coated electrode sheet has excess foil 211, it is unwound by the electrode sheet unwinding mechanism 110, and after the quality of the electrode sheet is judged by the electrode sheet incoming inspection mechanism 171, the electrode sheet deviation rectifying mechanism 181 adjusts the position of the electrode sheet to ensure the accuracy of laser slitting the foil. After the electrode sheet is laser slit, the tab shape is die-cut, and then the dressing width of the electrode sheet is measured by the electrode sheet dressing width inspection mechanism 160. After that, processes such as dust removal, deviation rectification, tension control, length measurement, and tab folding of the electrode sheet and tabs are required, and finally it is inserted into the winding position for cell winding. The number and position of processes such as dust removal, deviation rectification, tension control, and length measurement are set as required and are not limited herein. After the cell winding is completed, the winding mechanism needs to change positions to apply the end glue, and then it is unloaded and a series of operations such as height measurement, diameter measurement, end face inspection, and high-voltage impact are carried out.

[0047] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure does not separately describe various possible combination methods.

[0049] Furthermore, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A slitting, die-cutting and winding integrated device, characterized in that It includes a pole piece unwinding mechanism, a pole piece cutting mechanism, and a battery core winding mechanism arranged in sequence along the conveying direction, and a diaphragm unwinding mechanism arranged on the feeding side of the battery core winding mechanism. Among them, the pole piece cutting mechanism includes a foil cutting module and an ear cutting module arranged in sequence along the conveying direction. The foil cutting module is used to cut and remove redundant foil, and the ear cutting module is used to cut ears on the pole piece.

2. The slitting, die-cutting and winding integrated device according to claim 1, wherein The foil cutting module and / or the ear cutting module is a laser cutting machine.

3. The slitting, die-cutting and winding integrated device according to claim 2, wherein, The foil cutting module includes a first cutting control module, which is used for cutting gap ears, and the first cutting control module is configured to control the laser to run along a predetermined trajectory so as to be able to form ears while removing redundant foil at the position without ears.

4. The slitting, die-cutting and winding integrated device according to claim 2, wherein, The foil cutting module includes a second cutting control module, which is used for cutting oblique seam ears, and the second cutting control module is configured to control the laser to run along a predetermined trajectory so as to first remove redundant foil outside the ears, then slit to form ears, and finally remove redundant foil at the position without ears.

5. The slitting, die-cutting and winding integrated device according to claim 2, characterized in that, The foil cutting module includes a third cutting control module, which is used for cutting oblique seam ears, and the third cutting control module is configured to control the laser to run along a predetermined trajectory so as to remove redundant foil outside the ears while removing redundant foil at the position without ears, and then slit to form ears.

6. The slitting, die-cutting and winding integrated device according to claim 1, characterized in that, The device further includes an alignment detection mechanism arranged adjacent to the battery core winding mechanism.

7. The slitting, die-cutting and winding integrated device according to claim 6, wherein, The alignment detection mechanism is arranged on one side of the battery core winding mechanism, and the device further includes a pole piece dressing width detection mechanism arranged between the pole piece cutting mechanism and the battery core winding mechanism.

8. The slitting, die-cutting and winding integrated device according to claim 1, wherein, An incoming pole piece detection mechanism and a pole piece deviation correction mechanism are further arranged on the discharging side of the pole piece unwinding mechanism.

9. The slitting, die-cutting and winding integrated device according to claim 1, wherein, An incoming diaphragm detection mechanism and a diaphragm deviation correction mechanism are further arranged on the discharging side of the diaphragm unwinding mechanism.

10. The slitting, die-cutting and winding integrated device according to claim 7, characterized in that, The device further includes an adhesive pasting mechanism arranged adjacent to the battery core winding mechanism.

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