Winding mechanism and winding device

Abstract

A winding mechanism (100) and a winding device. The winding mechanism (100) comprises at least two unwinding mechanisms (20) and a first clamping assembly (10). Each unwinding mechanism (20) is configured to implement electrode sheet unwinding transmission and can independently transmit an electrode sheet, the unwinding mechanism (20) comprises an electrode sheet starting end (20a) and an electrode sheet free end (20b), and the first clamping assembly (10) is configured to allow the electrode sheet free end (20b) of any of the unwinding mechanisms (20) to be transmitted the next procedure. Each unwinding mechanism (20) of the winding mechanism (100) can independently work, and the electrode sheet free end (20b) of each unwinding mechanism (20) is transmitted to the next procedure by means of the first clamping assembly (10).

Description

Winding mechanism and winding device

[0001] This disclosure claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 28, 2023, with application number 202311272650.7 and invention name “Winding mechanism and winding device”, the entire content of which is incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the technical field of battery pole piece processing, and in particular provides a winding mechanism and a winding device having the winding mechanism. Background Art

[0003] The electrode assembly is formed by winding the positive electrode sheet, the separator and the negative electrode sheet. Usually, the rolled electrode sheet and the separator are placed on a winding mechanism and then formed into an integrated sheet structure under the pressing action of a composite roller.

[0004] Before the positive and negative electrode sheets are pressed and wound, they need to undergo a performance test. The electrode sheets that fail the performance test will be removed. For this purpose, a waste rejection mechanism is provided in the winding mechanism to reject the electrode sheets that fail the performance test.

[0005] However, during the waste rejection process, the winding mechanism needs to stop unwinding, which results in low production efficiency of the electrode assembly. Technical issues

[0006] The purpose of the present disclosure is to provide a winding mechanism and a winding device, aiming to solve the problem of low electrode assembly production efficiency caused by the need to stop the existing winding mechanism when rejecting waste. Technical Solutions

[0007] To achieve the above objectives, the technical solutions adopted in this disclosure are:

[0008] In a first aspect, the present disclosure provides a winding mechanism, comprising:

[0009] At least two sets of unwinding mechanisms, the unwinding mechanisms are used to realize the unwinding and transmission of the pole piece and can independently transmit the pole piece, the unwinding mechanisms include a pole piece starting end and a pole piece free end opposite to the pole piece starting end;

[0010] A first clamping assembly, wherein the first clamping assembly is used to transfer the free end of the pole piece of any one of the unwinding mechanisms to the next process.

[0011] The beneficial effects of the present disclosure include: the winding mechanism provided by the present disclosure comprises at least two unwinding mechanisms and a first clamping assembly. Each unwinding mechanism is capable of operating independently, and the free ends of the electrode sheets of each unwinding mechanism are transferred to the next process step via the first clamping assembly. Thus, if an electrode sheet on any unwinding mechanism is rejected due to unqualified inspection, unwinding is stopped, while the remaining unwinding mechanisms can continue unwinding to maintain a continuous output of electrode sheets, thereby enabling the entire electrode assembly production process to proceed continuously and achieving higher production efficiency.

[0012] In some embodiments, the winding mechanism further includes a linkage mechanism, and the linkage mechanism is used to switch and transmit the free end of the pole piece of any one of the unwinding mechanisms to the first clamping assembly.

[0013] By adopting the above technical solution, the linkage mechanism is used to switch and transmit the free end of the pole piece of any unwinding mechanism to the first clamping assembly, which is suitable for outputting the free end of the pole piece of each unwinding mechanism in a certain order.

[0014] In some embodiments, the linkage mechanism includes a first guide roller and a second guide roller arranged opposite to each other, and the first guide roller and the second guide roller can independently move toward or away from the first clamping assembly to transfer the free end of the pole piece of the corresponding unwinding mechanism to the first clamping assembly.

[0015] By adopting the above technical solution, the first guide roller and the second guide roller independently move toward or away from the first clamping assembly, thereby transmitting the free end of the pole piece of the unwinding mechanism that has passed the pole piece inspection to the first clamping assembly.

[0016] In some embodiments, the first clamping assembly includes two first clamping plates arranged opposite to each other, and the two first clamping plates can move toward or away from each other to clamp the pole piece.

[0017] By adopting the above technical solution, the two first clamping plates clamp the pole pieces on the corresponding unwinding mechanisms.

[0018] In some embodiments, the unwinding mechanism includes a starting roller, a detection mechanism, a clamping roller and a waste rejection mechanism arranged in sequence along the pole piece transmission path. The pole piece is unwound from the starting roller, passing through the detection mechanism, the clamping roller and the waste rejection mechanism.

[0019] By adopting the above technical solution, the starting roller is used to wind the electrode and unwind it under the action of external force. The detection mechanism is used to detect the electrical properties of the electrode. The clamping roller is used to position and clamp the electrode. The waste rejection mechanism is used to reject unqualified electrode pieces on the transmission line.

[0020] In some embodiments, the unwinding mechanism further includes a metering roller located at a subsequent process position of the detection mechanism.

[0021] By adopting the above technical solution, the metering roller is used to measure the length of the unwound electrode piece to ensure accurate measurement of unqualified electrode pieces.

[0022] In some embodiments, the unwinding mechanism further includes a cache mechanism, and the cache mechanism is used to store the electrode pieces that have passed the inspection for clamping by the first clamping assembly.

[0023] By adopting the above technical solution, the cache mechanism can effectively store qualified electrodes, facilitate uninterrupted winding in subsequent processes, and greatly improve winding efficiency.

[0024] In some embodiments, the cache mechanism includes a plurality of reversing rollers, and the pole piece is wound around each of the reversing rollers in sequence.

[0025] In some embodiments, the waste rejection mechanism includes a second clamping assembly, a cutting assembly, and a single winding roller, which are sequentially arranged along the transmission path of the pole piece.

[0026] By adopting the above technical solution, the cutting mechanism cuts off the unqualified pole piece for the first time, the clamping mechanism clamps the unqualified pole piece and moves the starting position toward the single-winding roller, and the single-winding roller winds the unqualified pole piece. As the winding process proceeds, the cutting mechanism cuts off the unqualified pole piece for the second time. The two cutting actions just remove the unqualified pole piece, and finally all the unqualified pole pieces are wound on the single-winding roller.

[0027] In some embodiments, the second clamping assembly includes two second clamping plates arranged opposite to each other, and the two second clamping plates can move toward or away from each other to clamp the pole piece.

[0028] By adopting the above technical solution, the pole piece is between the second clamping plates and moves toward the single winding roller under the clamping action of the two second clamping plates, so that the cut unqualified pole piece can be wound on the single winding roller.

[0029] In some embodiments, the cutting assembly includes a cutter and a push piece located on opposite sides of the pole piece, and the cutter is capable of moving toward the push piece.

[0030] By adopting the above technical solution, the cutter cuts off the pole piece when moving toward the abutting member so as to be clamped by the clamping mechanism.

[0031] In some embodiments, the single-roller includes two sub-rollers arranged opposite to each other and forming a gap. The two sub-rollers can move toward or away from each other. At least one of the sub-rollers is provided with an extension roller, which can move away from or toward the corresponding sub-roller.

[0032] By adopting the above technical solution, the gap between the two sub-rollers is used for the pole piece to pass through, and the two sub-rollers move toward each other to clamp it, and then the pole piece is wound and collected; at the same time, when the pole piece is wound, the extension roller is in an extended state with the back ion roller moving outward, which increases the winding radius of the pole piece and can improve the rotation speed of the single roll to a certain extent, and when removing the pole piece, the extension roller is in a contracted state moving inward toward the sub-roller body, so that the gap between the pole piece and each sub-roller body is increased, which facilitates the removal of the pole piece from the single roll.

[0033] In a second aspect, an embodiment of the present disclosure further provides a winding device, comprising the winding mechanism described above.

[0034] Beneficial effects of the present disclosure: The winding device provided by the present disclosure, based on the upper winding mechanism, has a higher winding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a schematic structural diagram of a winding mechanism in an initial state provided by an embodiment of the present disclosure;

[0037] FIG2 is a schematic structural diagram of a first working state of a winding mechanism provided by an embodiment of the present disclosure;

[0038] FIG3 is a schematic structural diagram of a second working state of a winding mechanism provided by an embodiment of the present disclosure;

[0039] FIG4 is a schematic structural diagram of a winding mechanism in a third working state according to an embodiment of the present disclosure;

[0040] FIG5 is a schematic structural diagram of a winding mechanism in a fourth working state according to an embodiment of the present disclosure;

[0041] FIG6 is a schematic structural diagram of a winding mechanism in a fifth working state according to an embodiment of the present disclosure;

[0042] FIG7 is a cross-sectional view of a winding mechanism provided in an embodiment of the present disclosure.

[0043] Among them, the figure marks are: 100, winding mechanism; 10, first clamping assembly; 11, first clamping plate; 20, unwinding mechanism; 20a, pole piece starting end; 20b, pole piece free end; 21, starting roller; 22, detection mechanism; 23, metering roller; 24, cache mechanism; 25, clamping roller; 26, waste rejection mechanism; 241, reversing roller; 261, second clamping assembly; 262, cutting assembly; 263, single roll roller; 2611, second clamping plate; 2621, cutter; 2622, push member; 2631, sub-roller body; 2632, extending roller; 30, linkage mechanism; 31, first guide roller; 32, second guide roller. Modes for Carrying Out the Invention

[0044] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0045] In the description of the present disclosure, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0047] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0048] The electrode assembly is made of a positive electrode sheet, a separator and a negative electrode sheet wound together, which requires the use of a winding device. The positive electrode sheet, separator and negative electrode sheet are unwound separately, pressed together to form a whole, and then rolled into a bundle by a winding needle. Both the positive electrode sheet and the negative electrode sheet have separate feeding mechanisms to provide incoming materials for the manufacture of electrode assemblies. At the same time, in order to improve the yield rate of the electrode assembly, the electrical properties of the incoming electrode sheets will be electrically tested during the feeding process. Once unqualified electrode sheets appear, they need to be discarded from the transmission line, which also causes the entire electrode sheet transmission process to be shut down. The feeding of the incoming electrode sheets is suspended, and the winding of the electrode assembly is also passively suspended, which greatly affects the production efficiency of the electrode assembly.

[0049] In light of this, and to improve electrode assembly production efficiency, embodiments of the present disclosure provide a winding mechanism comprising at least two unwinding mechanisms, enabling independent unwinding of electrode sheets. This ensures that electrode sheets are continuously fed to a first clamping assembly, where they are then transferred to the next process step. This allows for continuous winding of electrode assemblies without downtime.

[0050] A battery cell includes a shell, an electrode assembly and an electrolyte. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs. One or more electrode assemblies may be contained in the shell. The electrode assembly is mainly formed by winding a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0051] Please refer to FIG. 1 . In a first aspect, the present disclosure provides a winding mechanism 100 , comprising at least two sets of unwinding mechanisms 20 and a first clamping assembly 10 .

[0052] The unwinding mechanism 20 is used to realize the unwinding and transmission of the pole piece. The unwinding mechanism 20 includes a pole piece starting end 20a and a pole piece free end opposite to the pole piece starting end 20a.

[0053] The first clamping assembly 10 is used to transfer the pole piece free end 20 b of any one of the unwinding mechanisms 20 to the next process.

[0054] It can be understood that the number of the unwinding mechanisms 20 includes two or more, and each unwinding mechanism 20 can unwind independently, that is, the unwinding actions of the unwinding mechanisms 20 do not interfere with or affect each other.

[0055] The pole piece starting end 20 a is the starting point of the pole piece unwinding, and the pole piece free end 20 b is the position of pole piece transmission, that is, the end of the pole piece before entering the first clamping assembly 10 .

[0056] The first clamping assembly 10 plays a role of aggregation, so as to keep at least one pole piece free end 20 b of the unwinding mechanism 20 from being transferred from the first clamping assembly 10 to the next process.

[0057] In this way, the free ends 20b of the electrode pieces of each unwinding mechanism 20 can be alternately unwound and transferred to the first clamping assembly 10. For example, when the free end 20b of the electrode piece of one unwinding mechanism 20 is feeding the electrode piece to the first clamping assembly 10, the other unwinding mechanisms 20 stop feeding the electrode piece. Once the electrode piece of the current unwinding mechanism 20 is detected as unqualified and stops feeding the electrode piece, any of the other unwinding mechanisms 20 will take over and feed the electrode piece to ensure that the electrode piece at the first clamping assembly 10 is continuously transferred to the next process. By analogy, once the current unwinding mechanism 20 stops feeding the electrode piece, the other unwinding mechanisms 20 will take over and unwind the electrode piece.

[0058] For example, there are two unwinding mechanisms 20 , and the two unwinding mechanisms 20 are arranged side by side. The pole piece free end 20 b of each unwinding mechanism 20 extends in the same direction toward the first clamping assembly 10 , and the pole pieces are alternately conveyed to the first clamping assembly 10 .

[0059] For example, there are three unwinding mechanisms 20 , and the transmission directions of the pole piece free ends 20 b of the three unwinding mechanisms 20 are set at an angle, and the pole piece free ends 20 b of each unwinding mechanism 20 also alternately convey the pole piece to the first clamping assembly 10 .

[0060] The winding mechanism 100 provided in the present disclosure includes at least two sets of unwinding mechanisms 20 and a first clamping assembly 10. Each set of unwinding mechanisms 20 is capable of operating independently, and the free end 20b of the electrode sheet of each unwinding mechanism 20 is transferred to the next process through the first clamping assembly 10. In this way, if an electrode sheet on any unwinding mechanism 20 is rejected due to inspection failure and unwinding stops, the remaining unwinding mechanisms 20 can continue unwinding to maintain a continuous output of electrode sheets, allowing the entire electrode assembly production process to proceed continuously and achieving higher production efficiency.

[0061] Please refer to FIG. 1 . In some embodiments, the winding mechanism 100 further includes a linkage mechanism 30 . The linkage mechanism 30 is used to switch and transmit the pole piece free end 20 b of any unwinding mechanism 20 to the first clamping assembly 10 .

[0062] It is understandable that the free end 20b of the pole piece of each unwinding mechanism 20 can be alternately transferred to the first clamping assembly 10 manually or automatically. Therefore, the linkage mechanism 30 is used to automatically switch and transfer the free end 20b of the pole piece of any unwinding mechanism 20 to the first clamping assembly 10.

[0063] For example, the linkage mechanism 30 includes multiple mechanical clamping arms, each mechanical clamping arm corresponds to a pole piece free end 20 b of the unwinding mechanism 20 , and the mechanical clamping arm can clamp the corresponding pole piece free end 20 b of the unwinding mechanism 20 to the first clamping assembly 10 .

[0064] For example, the linkage mechanism 30 includes a plurality of adjacently arranged guide rollers, each of which can face toward or away from the pole piece, and the free end 20b of each unwinding mechanism 20 is clamped between two of the guide rollers, and the two adjacent guide rollers clamp and transmit the free end 20b of the pole piece of the current unwinding mechanism 20 to the first clamping assembly 10.

[0065] In this way, the linkage mechanism 30 is used to switch and transmit the pole piece free end 20b of any unwinding mechanism 20 to the first clamping assembly 10, and is suitable for outputting the pole piece free end 20b of each unwinding mechanism 20 in a certain order.

[0066] Please refer to Figure 1. In some embodiments, the linkage mechanism 30 includes a first guide roller 31 and a second guide roller 32 that are relatively arranged. The first guide roller 31 and the second guide roller 32 can independently move toward or away from the first clamping assembly 10 to transfer the free end 20b of the pole piece of the corresponding unwinding mechanism 20 to the first clamping assembly 10.

[0067] It can be understood that the pole piece free end 20b of each unwinding mechanism 20 can be clamped by the first guide roller 31 and the second guide roller 32 and transferred to the first clamping assembly 10. At the same time, when it is necessary to switch the pole piece free end 20b of another unwinding mechanism 20, the first guide roller 31 or the second guide roller 32 moves away from the first clamping assembly 10 to form a clamping gap, and the pole piece free end 20b of the other unwinding mechanism 20 is transferred into the gap to form a clamped relationship, and then the pole piece free end 20b of the unwinding mechanism 20 is transferred to the first clamping assembly 10.

[0068] For example, as shown in Figures 1 to 6, Figure 1 is a structural schematic diagram of the initial state of the winding mechanism provided by an embodiment of the present disclosure. In the initial state, an unwinding mechanism in the winding mechanism normally transmits the electrode; Figure 2 is a structural schematic diagram of the first working state of the winding mechanism provided by an embodiment of the present disclosure. The first working state is that unqualified electrode sheets are detected in one of the unwinding mechanisms; Figure 3 is a structural schematic diagram of the second working state of the winding mechanism provided by an embodiment of the present disclosure. The second working state is that the electrode sheets of another unwinding mechanism are replaced; Figure 4 is a structural schematic diagram of the third working state of the winding mechanism provided by an embodiment of the present disclosure. The third working state is that another unwinding mechanism completes feeding; Figure 5 is a structural schematic diagram of the fourth working state of the winding mechanism provided by an embodiment of the present disclosure. The fourth working state is that the unwinding mechanism with unqualified electrode sheets collects the bad products in a single roll; Figure 6 is a structural schematic diagram of the fifth working state of the winding mechanism provided by an embodiment of the present disclosure; the fifth working state is that the unwinding mechanism with unqualified electrode sheets is waiting to be replaced and fed again. Two unwinding mechanisms 20 are arranged side by side. In the initial stage, the free end 20b of the electrode piece of one unwinding mechanism 20 is clamped between the first guide roller 31 and the second guide roller 32 and is transferred to the first clamping assembly 10, while the free end 20b of the electrode piece of the other unwinding mechanism 20 is in a waiting state. When an unqualified electrode piece appears in the current unwinding mechanism 20, the first guide roller 31 and the second guide roller 32 are offset to allow the unqualified electrode piece of the current unwinding mechanism 20 to be rewound. At the same time, the free end 20b of the electrode piece of the other unwinding mechanism 20 extends between the first guide roller 31 and the second guide roller 32. The first guide roller 31 and the second guide roller 32 return to their relative position and transfer the electrode piece to the first clamping assembly 10.

[0069] Referring to FIG. 1 , in some embodiments, the first clamping assembly 10 includes two first clamping plates 11 disposed opposite to each other. The two first clamping plates 11 can move toward or away from each other to clamp the pole piece.

[0070] During the clamping action, one of the two first clamping plates 11 moves toward the other; or the two first clamping plates 11 move toward each other. Therefore, according to actual use requirements, a mechanism or device for providing clamping force can be configured for one of the two first clamping plates 11 or for both clamping plates.

[0071] Please refer to Figure 1. In some embodiments, the unwinding mechanism 20 includes a starting roller 21, a detection mechanism 22, a clamping roller 25 and a waste rejection mechanism 26 arranged in sequence along the electrode transmission path. The electrode is unwound from the starting roller 21, passing through the detection mechanism 22, the clamping roller 25 and the waste rejection mechanism 26.

[0072] It can be understood that the starting roller 21 is used to wind the electrode and unwind it under the action of external force. The detection mechanism 22 is used to detect the electrical properties of the electrode. The clamping roller 25 is used to position and clamp the electrode. The waste rejection mechanism 26 is used to reject unqualified electrode pieces on the transmission line.

[0073] Referring to FIG. 1 , in some embodiments, the unwinding mechanism 20 further includes a metering roller 23 located at a subsequent process position of the detecting mechanism 22 .

[0074] The metering roller 23 is used to measure the length of the unwound electrode piece to ensure accurate measurement of unqualified electrode pieces.

[0075] The metering roller 23 is a roller body with a fixed and known outer diameter. The length of the pole piece to be transported downstream is calculated by winding the pole piece around a quarter or a half of the circumference of the metering roller 23 .

[0076] Please refer to FIG. 1 . In some embodiments, the unwinding mechanism 20 further includes a buffer mechanism 24 . The buffer mechanism 24 is used to store the electrode pieces that have passed the inspection for clamping by the first clamping assembly 10 .

[0077] The buffer mechanism 24 may include a plurality of single rollers, each of which is alternately arranged along the transmission direction, and the electrode pieces are wound around each single roller in sequence to accumulate a certain number of qualified electrode pieces between the first single roller and the last single roller.

[0078] In this way, the cache mechanism 24 can effectively store qualified electrodes, facilitate uninterrupted winding in subsequent processes, and greatly improve winding efficiency.

[0079] Specifically, referring to FIG. 1 , in a specific embodiment, the buffer mechanism 24 includes a plurality of reversing rollers 241 , and the pole pieces are wound around each of the reversing rollers 241 in sequence.

[0080] The reversing rollers 241 are alternately arranged along the transmission direction, and the pole pieces are wound around the reversing rollers 241 in sequence, so as to accumulate a certain length of qualified pole pieces between the first reversing roller 241 and the last reversing roller 241 .

[0081] Referring to FIG. 1 , in some embodiments, the reject mechanism 26 includes a second clamping assembly 261 , a cutting assembly 262 , and a single roll 263 , which are sequentially arranged along the transmission path of the electrode piece.

[0082] The second clamping assembly 261 has two process actions: one is a clamping action, which clamps the cut electrode piece; the other is a pushing action, which pushes the clamped electrode piece to the single winding roller 263.

[0083] Therefore, the second clamping assembly 261 may have relatively arranged power mechanisms such as air cylinders and hydraulic cylinders to provide clamping force, and a screw mechanism, a lifting mechanism and a reciprocating transmission mechanism to provide reciprocating movement power.

[0084] The cutting component 262 cuts off the unqualified electrode pieces and separates the unqualified electrode pieces from the transmission line.

[0085] The cutting component 262 performs the first cutting on the unqualified pole piece, and the second clamping component 261 clamps the starting position of the unqualified pole piece and moves toward the single winding roller 263, and the single winding roller 263 winds the unqualified pole piece. As the winding process proceeds, the cutting component 262 performs the second cutting on the unqualified pole piece. The two cutting actions just remove the unqualified pole piece. Finally, all the unqualified pole pieces are wound on the single winding roller 263.

[0086] In some embodiments, the second clamping assembly 261 includes two second clamping plates 2611 disposed opposite to each other. The two second clamping plates 2611 can move toward or away from each other to clamp the pole piece.

[0087] It is understood that when the clamping action is performed, one of the two second clamping plates 2611 moves toward the other, or both second clamping plates 2611 move toward each other. Therefore, according to actual use requirements, a mechanism or device for providing a clamping force can be configured for one or both of the second clamping plates 2611.

[0088] At the same time, during the pushing action, the two second clamping plates 2611 can move toward or away from the single-winding roller 263 to push the clamped pole piece to the single-winding roller 263 for winding by the single-winding roller 263 .

[0089] Specifically, the electrode sheet is transferred between the two second clamping plates 2611. After being cut, the two second clamping plates 2611 clamp the cut electrode sheet and move it toward the single winding roller 263 to wind the cut unqualified electrode sheet onto the single winding roller 263. At the same time, the two second clamping plates 2611 return to their initial positions after completing the pushing.

[0090] In some embodiments, the cutting assembly 262 includes a cutter 2621 and a push member 2622 located on opposite sides of the pole piece. The cutter 2621 can move toward the push member 2622 .

[0091] When the cutter 2621 moves toward the abutting member 2622, it cuts off the electrode piece so that it can be clamped by the clamping mechanism. Specifically, the cutter 2621 cuts off the unqualified electrode piece twice to remove the unqualified electrode piece from the transmission line.

[0092] Please refer to Figure 7. In some embodiments, the single roller 263 includes two sub-roller bodies 2631 that are arranged opposite to each other and form a gap to accommodate the pole piece. The two sub-roller bodies 2631 can move toward or away from each other. At least one sub-roller body 2631 is provided with an extension roller 2632, and the extension roller 2632 can move away from or toward the corresponding sub-roller body 2631.

[0093] The two sub-rollers 2631 initially form a gap between them. In the unwound state, this gap also allows the electrode to pass through to meet transmission requirements. When the second clamping assembly 261 clamps the electrode and moves toward the two sub-rollers 2631, the two sub-rollers 2631 move toward each other, closing the gap and clamping the electrode. Then, with the gap closed, the two sub-rollers 2631 wind and collect the electrode.

[0094] At the same time, when the pole piece is wound, the extending roller 2632 is in an extended state with the back ion roller body 2631 moving outward, which increases the winding radius of the pole piece and can improve the rotation speed of the single winding roller 263 to a certain extent. When removing the pole piece, the extending roller 2632 is in a contracted state moving inward toward the sub-roller body 2631. In this way, the gap between the pole piece and each sub-roller body 2631 is increased, making it easier to remove the pole piece from the single winding roller 263.

[0095] Please refer to Figures 1 to 7. In a specific embodiment, the winding mechanism 100 includes two unwinding mechanisms 20 arranged side by side, a linkage mechanism 30 and a first clamping assembly 10, and under the action of the linkage mechanism 30, the free ends 20b of the pole pieces of the two unwinding mechanisms 20 are alternately transmitted to the first clamping assembly 10.

[0096] Specifically, the first clamping assembly 10 includes two first clamping plates 11 arranged opposite to each other. The two first clamping plates 11 can move toward or away from each other to clamp the pole piece.

[0097] The unwinding mechanism 20 includes a starting roller 21, a detection mechanism 22, a metering roller 23, a cache mechanism 24, a clamping roller 25 and a waste rejection mechanism 26, which are arranged in sequence along the electrode transmission path. The electrode is unwound from the starting roller 21, passing through the detection mechanism 22, the metering roller 23, the cache mechanism 24, the clamping roller 25 and the waste rejection mechanism 26.

[0098] The starting roller 21 is used to wind the electrode and unwind it under the action of external force. The detection mechanism 22 is used to detect the electrical properties of the electrode. The clamping roller 25 is used to position and clamp the electrode. The rejection mechanism 26 is used to reject unqualified electrode pieces on the transmission line.

[0099] The metering roller 23 is used to measure the length of the unwound electrode sheet to ensure accurate measurement of unqualified electrode sheets. The metering roller 23 is a roller with a fixed and known outer diameter. The length of the electrode sheet transmitted downstream is calculated by winding the electrode sheet around a quarter or half of the circumference of the metering roller 23.

[0100] The buffer mechanism 24 may include a plurality of reversing rollers 241 , which are alternately arranged along the transmission direction. The pole pieces are sequentially wound around the reversing rollers 241 to accumulate a certain number of qualified pole pieces between the first reversing roller 241 and the last reversing roller 241 .

[0101] The reject mechanism 26 includes a second clamping assembly 261 , a cutting assembly 262 and a single roll 263 which are sequentially arranged along the transmission path of the electrode piece.

[0102] The second clamping assembly 261 has two process actions: one is a clamping action, which clamps the cut electrode piece; the other is a pushing action, which pushes the clamped electrode piece to the single winding roller 263.

[0103] Therefore, the second clamping assembly 261 may have relatively arranged power mechanisms such as air cylinders and hydraulic cylinders to provide clamping force, and a screw mechanism, a lifting mechanism and a reciprocating transmission mechanism to provide reciprocating movement power.

[0104] The cutting component 262 cuts off the unqualified electrode pieces and separates the unqualified electrode pieces from the transmission line.

[0105] The cutting component 262 performs the first cutting on the unqualified pole piece, and the second clamping component 261 clamps the starting position of the unqualified pole piece and moves toward the single winding roller 263, and the single winding roller 263 winds the unqualified pole piece. As the winding process proceeds, the cutting component 262 performs the second cutting on the unqualified pole piece. The two cutting actions just remove the unqualified pole piece. Finally, all the unqualified pole pieces are wound on the single winding roller 263.

[0106] The second clamping assembly 261 includes two second clamping plates 2611 arranged opposite to each other. The two second clamping plates 2611 can move toward or away from each other to clamp the pole piece.

[0107] The cutting assembly 262 includes a cutter 2621 and a push member 2622 located on opposite sides of the electrode. The cutter 2621 can move toward the push member 2622 .

[0108] The single roll 263 includes two sub-rollers 2631 arranged opposite to each other and forming a gap for accommodating the pole pieces. The two sub-rollers 2631 can move toward or away from each other. At least one sub-roller 2631 is provided with an extension roller 2632, which can move away from or toward the corresponding sub-roller 2631.

[0109] The two sub-rollers 2631 initially form a gap between them. In the unwound state, this gap also allows the electrode to pass through to meet transmission requirements. When the second clamping assembly 261 clamps the electrode and moves toward the two sub-rollers 2631, the two sub-rollers 2631 move toward each other, closing the gap and clamping the electrode. Then, with the gap closed, the two sub-rollers 2631 wind and collect the electrode.

[0110] At the same time, when the pole piece is wound, the extending roller 2632 is in an extended state with the back ion roller body 2631 moving outward, which increases the winding radius of the pole piece and can improve the rotation speed of the single winding roller 263 to a certain extent. When removing the pole piece, the extending roller 2632 is in a contracted state moving inward toward the sub-roller body 2631. In this way, the gap between the pole piece and each sub-roller body 2631 is increased, making it easier to remove the pole piece from the single winding roller 263.

[0111] The linkage mechanism 30 includes a first guide roller 31 and a second guide roller 32 that are arranged opposite to each other. The first guide roller 31 and the second guide roller 32 can independently move toward or away from the first clamping assembly 10 to transfer the free end 20b of the pole piece of the corresponding unwinding mechanism 20 to the first clamping assembly 10.

[0112] In the initial stage, the free end 20b of the electrode piece of one unwinding mechanism 20 is clamped between the first guide roller 31 and the second guide roller 32 and is transferred to the first clamping assembly 10, while the free end 20b of the electrode piece of the other unwinding mechanism 20 is in a waiting state. When an unqualified electrode piece appears in the current unwinding mechanism 20, the first guide roller 31 and the second guide roller 32 are offset to allow the unqualified electrode piece of the current unwinding mechanism 20 to be rewound. At the same time, the free end 20b of the electrode piece of the other unwinding mechanism 20 extends between the first guide roller 31 and the second guide roller 32. The first guide roller 31 and the second guide roller 32 return to their relative position and transfer the electrode piece to the first clamping assembly 10.

[0113] In a second aspect, an embodiment of the present disclosure further provides a winding device, comprising the above-mentioned winding mechanism 100 .

[0114] The winding device provided by the present disclosure has an upper winding mechanism 100 and has a higher winding efficiency.

[0115] Of course, the winding device also includes other mechanical parts, such as a diaphragm winding roller for winding the diaphragm, a pressing roller for realizing the compounding of the electrode sheet and the diaphragm, and a winding roller for winding the finished electrode assembly.

Claims

1. A winding mechanism, wherein: include: At least two sets of unwinding mechanisms, each of which is used to realize the unwinding and transmission of the pole piece and can independently transmit the pole piece, and the unwinding mechanism includes a pole piece starting end and a pole piece free end opposite to the pole piece starting end, A first clamping assembly, wherein the first clamping assembly is used to transfer the free end of the pole piece of any one of the unwinding mechanisms to the next process.

2. The winding mechanism according to claim 1, wherein: The winding mechanism further includes a linkage mechanism, and the linkage mechanism is used to switch and transmit the free end of the pole piece of any one of the unwinding mechanisms to the first clamping assembly.

3. The winding mechanism according to claim 2, wherein: The linkage mechanism includes a first guide roller and a second guide roller that are arranged opposite to each other. The first guide roller and the second guide roller can independently move toward or away from the first clamping assembly to transfer the free end of the pole piece of the corresponding unwinding mechanism to the first clamping assembly.

4. The winding mechanism according to claim 1, wherein: The first clamping assembly includes two first clamping plates arranged opposite to each other, and the two first clamping plates can move toward or away from each other to clamp the pole piece.

5. The winding mechanism according to claim 1, wherein: The unwinding mechanism comprises a starting roller, a detection mechanism, a clamping roller and a waste rejection mechanism which are sequentially arranged along the pole piece transmission path. The pole piece is unwound from the starting roller, passing through the detection mechanism, the clamping roller and the waste rejection mechanism.

6. The winding mechanism according to claim 5, wherein: The unwinding mechanism further comprises a metering roller located at a subsequent process position of the detection mechanism.

7. The winding mechanism according to claim 5 or 6, wherein: The unwinding mechanism further includes a buffer mechanism, and the buffer mechanism is used to store the pole pieces that have passed the inspection so as to be clamped by the first clamping assembly.

8. The winding mechanism according to claim 7, wherein: The buffer mechanism comprises a plurality of reversing rollers, and the pole pieces are wound around each of the reversing rollers in sequence.

9. The winding mechanism according to claim 5, wherein: The waste rejection mechanism comprises a second clamping assembly, a cutting assembly and a single winding roller which are sequentially arranged along the transmission path of the pole piece.

10. The winding mechanism according to claim 9, wherein: The second clamping assembly includes two second clamping plates arranged opposite to each other, and the two second clamping plates can move toward or away from each other to clamp the pole piece.

11. The winding mechanism according to claim 9, wherein: The cutting assembly comprises a cutter and a push piece located at opposite sides of the pole piece, and the cutter can move toward the push piece.

12. The winding mechanism according to claim 9, wherein: The single roll includes two sub-roller bodies which are arranged opposite to each other and form a gap. The two sub-roller bodies can move toward or away from each other. At least one of the sub-roller bodies is provided with a protruding roller which can move away from or toward the corresponding sub-roller body.

13. A winding device, wherein: Comprising a winding mechanism as claimed in any one of claims 1 to 12.

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