Electrode sheet combination device and lamination apparatus

Abstract

Provided in the present disclosure are an electrode sheet combination device and a lamination apparatus. The electrode sheet combination device of the present disclosure comprises a raw material conveying mechanism, a thermal combination mechanism, a separator cutting mechanism and a removal mechanism which are successively arranged along an electrode sheet conveying path; the raw material conveying mechanism comprises an electrode sheet conveying unit and a separator conveying unit; the electrode sheet conveying unit is provided with an electrode sheet detection assembly; the electrode sheet detection assembly can detect a first preset defect on an electrode sheet, and make a mark on the part of the electrode sheet where the first preset defect is present; the removal mechanism can detect a second preset defect and a mark on a combined electrode sheet and remove the combined electrode sheet where the second preset defect or mark is present. In the electrode sheet combination device of the present disclosure, the electrode sheet detection assembly makes marks on parts of electrode sheets where defects are present, and the removal mechanism can detect second preset defects and marks on combined electrode sheets, helping to better remove electrode sheets having defects and thus improving the accuracy of removing the electrode sheets.

Description

Pole composite device and lamination equipment

[0001] This disclosure claims priority to an application filed with the Patent Office of China on June 27, 2023, with application number 202321654190.X and titled “Pole Composite Device and Lamination Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of lithium-ion batteries, and in particular to a pole piece composite device. The present disclosure also relates to a lamination device equipped with the pole piece composite device. Background Art

[0003] Lithium-ion batteries are widely used due to their high energy density, long service life, and environmentally friendly nature. The lamination process, a crucial step in the lithium-ion battery production process, significantly impacts the energy density and stability of the battery cell. During the lamination process, defects such as slurry protrusions or agglomerates, metal contamination, and scratches may appear on the electrode sheets. To ensure battery cell performance, existing lamination equipment typically detects defects during the lamination process between the electrode sheet and the separator, and removes defective electrode sheets.

[0004] However, the electrode composite device in the existing lamination equipment is limited by its own structure, and its ability to detect defective electrodes needs to be improved, and there are cases of misjudgment during detection. Therefore, during the production process, there is a phenomenon of mistakenly rejecting normal electrodes and missing defective electrodes, which easily leads to a waste of production resources. In addition, if there are defective electrodes in the battery cell, it will also have an adverse effect on its performance. Summary of the Invention

[0005] In view of this, the present disclosure aims to provide a pole piece composite device to improve the accuracy of pole piece removal.

[0006] To achieve the above objectives, the technical solution of the present disclosure is implemented as follows:

[0007] A pole piece composite device, comprising a raw material conveying mechanism, a thermal composite mechanism, a diaphragm cutting mechanism, and a rejecting mechanism sequentially arranged along a pole piece conveying path, wherein the raw material conveying mechanism comprises a pole piece conveying unit and a diaphragm conveying unit;

[0008] The electrode conveying unit comprises an electrode detection component and an electrode cutting component. The electrode detection component is capable of detecting a first preset defect on the electrode and setting a mark on the portion of the electrode where the first preset defect exists. The electrode cutting component is located downstream of the electrode detection component and is capable of cutting the electrode to a preset size.

[0009] The thermal composite mechanism is used to thermally composite the diaphragm and the electrode cut to the preset size into a composite sheet, the diaphragm cutting mechanism is used to cut the diaphragm, and the rejection mechanism can detect the second preset defect and the mark on the composite sheet, and reject the composite sheet with the second preset defect or the mark.

[0010] Furthermore, the pole piece detection assembly includes a first detection module for detecting a first preset defect on the pole piece, and a labeling module for pasting the mark on the pole piece.

[0011] Furthermore, the electrode conveying unit also includes a electrode unwinding assembly, which includes a electrode unwinding shaft and a electrode material receiving platform arranged downstream of the electrode unwinding shaft.

[0012] Furthermore, the electrode conveying unit further includes a correction sensor arranged between the electrode unwinding shaft and the electrode receiving platform;

[0013] The pole piece conveying unit further includes a pole piece deviation correction component arranged between the pole piece unwinding component and the pole piece detection component.

[0014] Furthermore, the pole piece deviation correction assembly includes a tensioning module and a deviation correction module arranged in sequence along the pole piece conveying direction.

[0015] Furthermore, the electrode conveying units are arranged in a plurality of groups side by side, and each group of the electrode conveying units selectively conveys the electrode to the thermal composite mechanism.

[0016] Furthermore, the diaphragm conveying unit includes a diaphragm unwinding assembly, and the diaphragm unwinding assembly includes a diaphragm unwinding shaft and a diaphragm material receiving platform arranged between the diaphragm unwinding shaft and the thermal composite unit.

[0017] Furthermore, the thermal lamination mechanism comprises a plurality of sets of composite rollers arranged in sequence along the electrode sheet conveying direction, the composite rollers comprising an upper pressing roller and a lower pressing roller spaced apart from each other, and the electrode sheet and the diaphragm pass between the upper pressing roller and the lower pressing roller.

[0018] Furthermore, the rejection mechanism includes a second detection module for detecting the second preset defect and the mark, and a rejection module for rejecting the composite sheet.

[0019] Compared with the prior art, the present disclosure has the following advantages:

[0020] The electrode composite device disclosed in the present invention is provided with an electrode detection component to detect the first preset defect on the electrode, and mark the defective part of the electrode, and is provided with a rejection mechanism to detect the second preset defect and mark on the composite piece, so as to better reject the defective electrode and improve the accuracy of rejecting the electrode.

[0021] In addition, the upper and lower detection parts are provided to facilitate the detection of the upper and lower surfaces of the electrode. And the electrode conveying unit includes an electrode material connection platform, which facilitates the connection of the replaced electrode with the original electrode after the electrode roll is replaced.

[0022] In addition, the provision of a correction sensor and a pole piece correction assembly facilitates the prevention of the pole piece from being skewed during transportation, and the correction assembly includes a tensioning module, which facilitates the tensioning of the pole piece belt.

[0023] Furthermore, by arranging the electrode conveying units into multiple groups arranged side by side and allowing each electrode conveying unit to selectively convey the electrode to the thermal composite mechanism, the electrode conveying efficiency and the utilization rate of the electrode composite device are improved.

[0024] Secondly, by making the thermal composite mechanism have multiple sets of composite rollers arranged in sequence along the electrode conveying direction, it is easy to ensure the firmness of the composite of the electrode and the diaphragm.

[0025] Another object of the present disclosure is to provide a lamination device, in which the pole piece composite device as described above is provided.

[0026] The lamination equipment disclosed in the present invention has the same technical effect as the above-mentioned pole piece composite device relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of this disclosure, are used to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are used to explain the disclosure and do not constitute an improper limitation of the disclosure. In the accompanying drawings:

[0028] FIG1 is a schematic structural diagram of a pole piece composite device according to an embodiment of the present disclosure;

[0029] FIG2 is a schematic structural diagram of a labeling module according to an embodiment of the present disclosure.

[0030] Description of reference numerals:

[0031] 1. Pole piece unwinding assembly; 101. Pole piece unwinding shaft; 102. Pole piece material receiving platform; 103. Correction sensor; 2. Pole piece correction assembly; 201. Tensioning module; 202. Correction module; 3. Pole piece detection assembly; 301. First detection module; 3011. Upper detection unit; 3012. Lower detection unit; 302. Labeling module;

[0032] 4. Pole piece cutting assembly; 5. Diaphragm unwinding assembly; 501. Diaphragm unwinding shaft; 502. Diaphragm material receiving platform; 6. Thermal lamination mechanism; 601. Lamination roller pair; 6011. Upper pressure roller; 6012. Lower pressure roller; 7. Buffer mechanism; 8. Diaphragm cutting mechanism; 9. Pass roller. DETAILED DESCRIPTION

[0033] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0034] In the description of this disclosure, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0035] Furthermore, in the description of this disclosure, unless otherwise explicitly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in this disclosure based on the specific circumstances.

[0036] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Example 1

[0037] This embodiment relates to a pole piece composite device. In terms of overall structure, the pole piece composite device includes a raw material conveying mechanism, a thermal composite mechanism 6, a diaphragm cutting mechanism 8, and a rejection mechanism, which are sequentially arranged along the pole piece conveying path. The raw material conveying mechanism includes a pole piece conveying unit and a diaphragm conveying unit. The pole piece conveying unit includes a pole piece detection component 3 and a pole piece cutting component 4. The pole piece detection component 3 is capable of detecting a first predetermined defect on the pole piece and marking the portion of the pole piece having the first predetermined defect. The pole piece cutting component 4 is located downstream of the pole piece detection component 3 and is capable of cutting the pole piece to a predetermined size.

[0038] In addition, the thermal composite mechanism 6 is used to thermally composite the diaphragm and the electrode cut to a preset size into a composite sheet, the diaphragm cutting mechanism 8 is used to cut the diaphragm, and the rejection mechanism can detect the second preset defects and marks on the composite sheet, and reject the composite sheet with the second preset defects or the marks.

[0039] It can be understood that in this embodiment, a pole piece detection component 3 is provided to detect the first preset defect on the pole piece, and a mark is set on the defective part of the pole piece, and a rejection mechanism is provided to detect the second preset defect and mark on the composite piece, so as to better reject the defective pole piece and improve the accuracy of rejecting the pole piece.

[0040] It should be noted that the first predetermined defect mentioned above may be slurry protrusions or agglomerations on the coated foil, scratches and foreign matter on the foil surface, etc. The second predetermined defect mentioned above may be scratches, damage and foreign matter on the composite sheet surface, etc.

[0041] Based on the above overall introduction, an exemplary structure of this embodiment is shown in Figures 1 and 2. Furthermore, as a preferred embodiment, the electrode inspection assembly 3 of this embodiment includes a first inspection module 301 for detecting a first predetermined defect on the electrode, and a labeling module 302 for attaching a label to the electrode. The first inspection module 301 includes an upper inspection portion 3011 for inspecting the upper surface of the electrode, and a lower inspection portion 3012 for inspecting the lower surface of the electrode.

[0042] The upper detection part 3011 and the lower detection part 3012 of this embodiment can be devices commonly used in the prior art for detecting defects on the electrode, such as a CCD camera, etc. As shown in Figure 1, detection parts are set on the upper and lower sides of the electrode to detect defects on both the upper and lower sides of the electrode.

[0043] The labeling module 302 can be a mechanism commonly used in the prior art for applying glue to the surface of the electrode. As shown in Figures 1 and 2, the electrode passes between the roller 9 and the labeling module 302. Of course, the use of labeling to set a mark on the surface of the electrode is only a preferred embodiment. In addition, other methods commonly used in the prior art to set a mark on the surface of the electrode, such as laser marking, can also be used.

[0044] As a preferred embodiment, as shown in FIG1 , in this embodiment, the electrode conveying unit further includes a electrode unwinding assembly 1, which includes a electrode unwinding shaft 101 and an electrode splicing platform 102 provided downstream of the electrode unwinding shaft 101. It is understandable that by providing the electrode splicing platform 102, it is convenient to splice the replaced electrode tape with the original electrode tape on the electrode splicing platform 102 when replacing the electrode roll, without having to rethread the tape after replacing the electrode roll, which is convenient to operate. The electrode splicing platform 102 of this embodiment can be designed with reference to the structure of the electrode splicing mechanism commonly used in the prior art.

[0045] In addition, as a further preferred embodiment, the electrode conveying unit further includes a correction sensor 103 provided between the electrode unwinding shaft 101 and the electrode receiving platform 102, and the electrode conveying unit further includes a electrode correction component 2 provided between the electrode unwinding component 1 and the electrode detection component 3. The correction sensor 103 can be any correction sensor 103 commonly used in the prior art. By providing the correction sensor 103, it is convenient to detect the electrode unwound by the electrode unwinding shaft 101, so as to provide a prompt after the electrode is deflected.

[0046] As a preferred arrangement, as shown in FIG1 , in this embodiment, the electrode deviation correction assembly 2 includes a tensioning module 201 and a correction module 202 arranged in sequence along the electrode conveying direction. The tensioning module 201 includes a tension swing roller. Any structures not mentioned in the tensioning module 201 can be designed with reference to existing tensioning mechanisms.

[0047] Furthermore, the deflection correction module 202 can be designed with reference to the mechanisms commonly used in the prior art for correcting the deflection of the transported electrode pieces. It is understood that the provision of the tensioning module 201 facilitates the tensioning of the transported electrode pieces, while the provision of the deflection correction module 202 facilitates the correction of the electrode pieces during transport, thereby preventing the transported electrode pieces from being skewed.

[0048] As a preferred embodiment, the electrode sheet conveying units are arranged in multiple groups side by side, and each group of electrode sheet conveying units selectively conveys the electrode sheet to the thermal recombination mechanism 6. In specific implementation, as shown in Figure 1, in this embodiment, there are two groups of electrode sheet conveying units. Of course, the number of electrode sheet conveying units is not limited to two groups, and can also be three, four, five, or six groups.

[0049] By setting up multiple groups of electrode conveying units and allowing each electrode conveying unit to selectively convey the electrode to the thermal composite mechanism 6, the efficiency of conveying the electrode can be improved. In the event that a group of electrode conveying units fails or needs to be replaced, the electrode can be conveyed through other electrode conveying units, which is beneficial to improving the utilization rate of the device.

[0050] As a preferred embodiment, the diaphragm conveying unit includes a diaphragm unwinding assembly 5, and the diaphragm unwinding assembly 5 includes a diaphragm unwinding shaft 501, and a diaphragm material receiving platform 502 arranged between the diaphragm unwinding shaft 501 and the thermal composite unit. Similar to the electrode material receiving platform 102, the diaphragm material receiving platform 502 is provided in this embodiment, which facilitates the connection of the replaced diaphragm material strip with the original diaphragm material strip after the roll is changed, thereby facilitating operation. The diaphragm material receiving platform 502 is designed with reference to the structure of the material strip connection device commonly used in the prior art, and will not be described in detail here. As shown in FIG1 , there are two symmetrically arranged groups of diaphragm conveying units, and the two groups of diaphragm conveying units respectively convey the diaphragm that is bonded to the upper surface of the electrode and the lower surface of the electrode.

[0051] As a preferred arrangement, in this embodiment, the thermal bonding mechanism 6 includes multiple sets of bonding rollers 601 arranged sequentially along the electrode sheet conveying direction. The bonding rollers 601 include an upper pressure roller 6011 and a lower pressure roller 6012 spaced apart from each other. The electrode sheet and the separator pass between the upper and lower pressure rollers 6011 and 6012. The provision of multiple sets of bonding rollers 601 in this embodiment facilitates the secure bonding of the electrode sheet and the separator. Furthermore, any other structures of the thermal bonding mechanism 6 not described in this embodiment can be designed with reference to the structures of conventional mechanisms for thermal bonding of electrode sheets and separators.

[0052] Preferably, in this embodiment, the rejection mechanism includes a second detection module for detecting second predetermined defects and marks, and a rejection module for rejecting composite sheets. It should be noted that the structure of the rejection mechanism is not shown in the accompanying drawings. In actual implementation, the second detection module may alternatively be a device such as a CCD camera used in the prior art to detect defects on composite sheets, and the rejection module may be designed with reference to the structure of a mechanism commonly used in the prior art for rejecting defective electrodes. By including the second detection module and the rejection module, the rejection mechanism facilitates the detection of defects and marks on the composite sheets, as well as the rejection of modules with defects and marks.

[0053] When the electrode composite device of this embodiment is in use, the material strip unwound by the electrode unwinding assembly 1 passes through the electrode deviation correction assembly 2, and the electrode detection assembly 3 detects the conveyed electrode and affixes a mark to the electrode with defects. After that, the electrode cutting assembly 4 cuts the electrode, and the cut electrode and the diaphragm are conveyed to the thermal composite mechanism 6 for thermal composite operation. The electrode cutting assembly 4 can be a mechanism commonly used in the prior art for cutting electrode, and a transfer mechanism for transferring electrode can be provided between the electrode cutting assembly 4 and the thermal composite mechanism 6 to transfer the cut electrode to the thermal composite mechanism 6.

[0054] In addition, the electrode composite device of this embodiment also includes a cache mechanism 7 arranged between the thermal composite mechanism 6 and the diaphragm cutting mechanism 8. The cache mechanism 7 can cache the composite sheet obtained after the thermal composite, so as to facilitate the delivery of the composite sheet to the diaphragm cutting mechanism 8 according to the needs of the diaphragm cutting mechanism 8. The composite sheet cut by the diaphragm cutting mechanism 8 is inspected by the rejection mechanism, and the defective composite sheet is rejected.

[0055] The electrode composite device of this embodiment is provided with a electrode detection component 3 to detect the first preset defect on the electrode, and set a mark on the defective part of the electrode to facilitate the positioning of the defective electrode, and is provided with a rejection mechanism to detect the second preset defect and mark on the composite piece, so as to facilitate better rejection of defective electrodes and improve the accuracy of electrode rejection.

[0056] In addition, the electrode pieces detected to have the first predetermined defect are rejected at the final rejection mechanism, so only one rejection mechanism is required, which simplifies the device structure and only requires one rejection process, thereby improving production efficiency. In addition, the provision of the correction sensor 103 and the electrode correction assembly 2 facilitates the prevention of skewness during the electrode conveyance process. Example 2

[0057] This embodiment relates to a lamination device, in which the pole piece composite device of the first embodiment is provided.

[0058] The lamination equipment of this embodiment has the same technical effects as the electrode composite device of the first embodiment relative to the prior art, and will not be described in detail here.

[0059] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A pole piece composite device, characterized in that: It includes a raw material conveying mechanism, a thermal compounding mechanism, a diaphragm cutting mechanism and a rejecting mechanism which are sequentially arranged along the electrode conveying path, and the raw material conveying mechanism includes an electrode conveying unit and a diaphragm conveying unit; The electrode piece conveying unit comprises an electrode piece detection component and an electrode piece cutting component, wherein the electrode piece detection component is capable of detecting a first preset defect on the electrode piece and setting a mark on a portion of the electrode piece where the first preset defect exists, and the electrode piece cutting component is located downstream of the electrode piece detection component and is capable of cutting the electrode piece to a preset size; The thermal composite mechanism is used to thermally composite the diaphragm and the pole piece cut to the preset size into a composite sheet, the diaphragm cutting mechanism is used to cut the diaphragm, and the rejection mechanism can detect the second preset defect and the mark on the composite sheet, and reject the composite sheet with the second preset defect or the mark.

2. The electrode composite device according to claim 1, characterized in that: The pole piece detection assembly includes a first detection module for detecting a first preset defect on the pole piece, and a labeling module for attaching the mark to the pole piece; The first detection module includes an upper detection part for detecting the upper surface of the pole piece, and a lower detection part for detecting the lower surface of the pole piece.

3. The pole piece composite device according to claim 1, characterized in that: The pole piece conveying unit further includes a pole piece unwinding assembly, and the pole piece unwinding assembly includes a pole piece unwinding shaft and a pole piece receiving platform arranged downstream of the pole piece unwinding shaft.

4. The pole piece composite device according to claim 3, characterized in that: The electrode conveying unit further includes a deviation correction sensor arranged between the electrode unwinding shaft and the electrode receiving platform; The pole piece conveying unit further includes a pole piece deviation correction component arranged between the pole piece unwinding component and the pole piece detection component.

5. The pole piece composite device according to claim 4, characterized in that: The pole piece deviation correction assembly comprises a tensioning module and a deviation correction module which are sequentially arranged along the pole piece conveying direction.

6. The pole piece composite device according to claim 1, characterized in that: The electrode sheet conveying units are multiple groups arranged side by side, and each group of the electrode sheet conveying units selectively conveys the electrode sheet to the thermal composite mechanism.

7. The pole piece composite device according to claim 1, characterized in that: The membrane conveying unit comprises a membrane unwinding assembly, and the membrane unwinding assembly comprises a membrane unwinding shaft and a membrane receiving platform arranged between the membrane unwinding shaft and the thermal compounding unit.

8. The pole piece composite device according to claim 1, characterized in that: The thermal composite mechanism has a plurality of composite roller pairs arranged in sequence along the electrode sheet conveying direction, the composite roller pairs include an upper pressing roller and a lower pressing roller arranged at intervals up and down, and the electrode sheet and the diaphragm pass between the upper pressing roller and the lower pressing roller.

9. The pole piece composite device according to any one of claims 1 to 8, characterized in that: The rejecting mechanism includes a second detection module for detecting the second preset defect and the mark, and a rejecting module for rejecting the composite sheet.

10. A lamination device, characterized in that: The lamination equipment is provided with a pole piece composite device as described in any one of claims 1 to 9.

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