Winding mechanism and winding device

Abstract

The invention relates to the technical field of battery pole piece processing, and provides a winding mechanism and a winding device.The winding mechanism comprises at least two sets of unwinding mechanisms and first clamping assemblies. The unwinding mechanisms are used for unwinding and conveying the pole pieces and can independently convey the pole pieces, each unwinding mechanism comprises a pole piece starting end and a pole piece free end, and the first clamping assembly is used for conveying the pole piece free end of any unwinding mechanism to the next process. Each unwinding mechanism of the winding mechanism can work independently, and the free end of the pole piece of each unwinding mechanism is conveyed to the next procedure through the first clamping assembly. Therefore, once the pole piece on any unwinding mechanism is rejected and unwinding is stopped due to the fact that the pole piece is detected to be unqualified, the other unwinding mechanisms can unwind continuously so as to keep the pole piece to be output continuously, so that the whole production process of the electrode assembly can be carried out continuously, and the production efficiency of the electrode assembly is higher.

Description

Technical Field

[0001] The present invention 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

[0002] The electrode assembly is formed by winding a positive electrode sheet, a separator and a 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.

[0003] Before the positive and negative electrode sheets are pressed and wound, they need to be tested for performance, and the electrode sheets that fail the performance test will be disassembled. For this purpose, a waste rejection mechanism is provided in the winding mechanism to reject the electrode sheets that fail the performance test.

[0004] However, during the waste rejection process, the winding mechanism needs to stop unwinding, which results in low production efficiency of the electrode assembly. Summary of the invention

[0005] The purpose of the present invention is to provide a winding mechanism and a winding device, aiming to solve the problem of low production efficiency of electrode assemblies caused by the need to stop the existing winding mechanism when rejecting waste.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present application provides a winding mechanism, comprising:

[0008] 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,

[0009] 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.

[0010] Beneficial effects of the present invention: The winding mechanism provided by the present invention comprises at least two sets of unwinding mechanisms and a first clamping assembly. Each set of unwinding mechanisms can work independently, and the free ends of the pole pieces of each unwinding mechanism are transmitted to the next process through the first clamping assembly. In this way, once the pole pieces on any unwinding mechanism are rejected due to unqualified detection, the unwinding is stopped, and the remaining unwinding mechanisms can continue to unwind to keep the pole pieces continuously output, so that the entire electrode assembly production process can be carried out continuously, and its production efficiency is higher.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] By adopting the above technical solution, the first guide roller and the second guide roller move independently 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.

[0015] In some embodiments, the first clamping assembly includes two first clamping plates that are arranged opposite to each other, and the two first clamping plates can move toward or away from each other to clamp the pole piece.

[0016] By adopting the above technical solution, the two first clamping plates clamp the pole pieces on the corresponding unwinding mechanisms.

[0017] 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.

[0018] By adopting the above technical solution, the starting roller is used to wind the pole piece and unwind it under the action of external force. The detection mechanism is used to detect the electrical capacity of the pole piece. The clamping roller is used to position and clamp the pole piece. The waste rejection mechanism is used to reject unqualified pole pieces on the transmission line.

[0019] In some embodiments, the unwinding mechanism further comprises a metering roller located at a subsequent process position of the detection mechanism.

[0020] By adopting the above technical solution, the metering roller is used to measure the length of the unwound pole piece to meet the requirements of accurate measurement of unqualified pole pieces.

[0021] In some embodiments, the unwinding mechanism further includes a cache mechanism, and the cache mechanism is used to store the pole pieces that have passed the inspection for clamping by the first clamping assembly.

[0022] By adopting the above technical solution, the cache mechanism can effectively continue to store qualified electrodes, facilitate uninterrupted winding in the subsequent process, and greatly improve the winding efficiency.

[0023] 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.

[0024] In some embodiments, the waste rejection mechanism includes a second clamping assembly, a cutting assembly and a single roll which are sequentially arranged along the transmission path of the pole piece.

[0025] By adopting the above technical scheme, the cutting mechanism cuts 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 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.

[0026] In some embodiments, the second clamping assembly includes two second clamping plates that are arranged opposite to each other, and the two second clamping plates can move toward or away from each other to clamp the pole piece.

[0027] 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 unqualified pole piece after being cut is wound on the single winding roller.

[0028] In some embodiments, the cutting assembly includes a cutter and an abutment member located on opposite sides of the pole piece, and the cutter can move toward the abutment member.

[0029] By adopting the above technical solution, when the cutter moves toward the abutting member, the pole piece is cut off so as to be clamped by the clamping mechanism.

[0030] In some embodiments, the single roll includes two sub-roller bodies that 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 an extension roller that can move away from or toward the corresponding sub-roller body.

[0031] By adopting the above technical scheme, the gap between the two sub-roller bodies is used for the pole piece to pass through, and the two sub-roller bodies 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 body 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.

[0032] In a second aspect, an embodiment of the present application further provides a winding device, comprising the winding mechanism described above.

[0033] Beneficial effects of the present invention: The winding device provided by the present invention, on the basis of having an upper winding mechanism, has a higher winding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of the winding mechanism in the initial state provided by an embodiment of the present invention;

[0036] Figure 2 A schematic structural diagram of a first working state of a winding mechanism provided by an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a second working state of a winding mechanism provided by an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a third working state of a winding mechanism provided by an embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of a fourth working state of a winding mechanism provided by an embodiment of the present invention;

[0040] Figure 6 A schematic structural diagram of a fifth working state of a winding mechanism provided by an embodiment of the present invention;

[0041] Figure 7 A cross-sectional view of a winding mechanism provided in an embodiment of the present invention.

[0042] Among them, the reference numerals in the figure are:

[0043] 100. Winding mechanism;

[0044] 10. First clamping assembly; 11. First clamping plate;

[0045] 20, unwinding mechanism; 20a, pole piece starting end; 20b, pole piece free end; 21, starting roller; 22, detection mechanism; 23, metering roller; 24, buffer 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, abutting member; 2631, sub-roller body; 2632, extension roller;

[0046] 30. Linkage mechanism; 31. First guide roller; 32. Second guide roller. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, 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 invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, 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 drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The electrode assembly is wound by the positive electrode sheet, the separator and the negative electrode sheet, which requires the use of a winding device. The positive electrode sheet, the separator and the 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.

[0052] In view of this, in order to improve the production efficiency of the electrode assembly, the embodiment of the present application provides a winding mechanism, which includes at least two sets of unwinding mechanisms, which can realize the independent unwinding of the electrode piece. That is, the electrode piece can be continuously output to the first clamping assembly, and then transferred to the next process by the first clamping assembly. In this way, the electrode assembly can be wound without stopping.

[0053] A battery cell includes a shell, an electrode assembly and an electrolyte. The electrode assembly is a component in the battery cell where electrochemical reactions occur. 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 a lug. The positive electrode lug and the negative electrode lug may be located together at one end of the main body or at both ends of the main body respectively. 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 lugs connect the electrode terminals to form a current loop.

[0054] Please refer to Figure 1 In a first aspect, the present application provides a winding mechanism 100 , comprising at least two sets of unwinding mechanisms 20 and a first clamping assembly 10 .

[0055] The unwinding mechanism 20 is used to realize the unwinding and transmission of the pole piece, and 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;

[0056] The first clamping assembly 10 is used to transfer the pole piece free end 20 b of any unwinding mechanism 20 to the next process.

[0057] 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.

[0058] 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 .

[0059] The first clamping assembly 10 plays a role of collecting, 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.

[0060] In this way, the free ends 20b of the pole pieces of each unwinding mechanism 20 can be alternately unwound and transmitted to the first clamping assembly 10. For example, when the free end 20b of the pole piece of one unwinding mechanism 20 is feeding the first clamping assembly 10, the other unwinding mechanisms 20 stop feeding. Once the pole piece of the current unwinding mechanism 20 is detected as unqualified and stops feeding, any of the other unwinding mechanisms 20 will take over and feed the pole piece to keep the pole piece at the first clamping assembly 10 continuously transmitted to the next process. By analogy, once the current unwinding mechanism 20 stops feeding the pole piece, the other unwinding mechanisms 20 will take over and unwind.

[0061] For example, there are two unwinding mechanisms 20 , and the two unwinding mechanisms 20 are arranged side by side. The pole piece free ends 20 b of the unwinding mechanisms 20 extend toward the first clamping assembly 10 in the same direction, and the pole pieces are alternately conveyed to the first clamping assembly 10 .

[0062] 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 arranged at an angle, and the pole piece free ends 20 b of the respective unwinding mechanisms 20 also alternately transport the pole piece to the first clamping assembly 10 .

[0063] The winding mechanism 100 provided by the present invention comprises at least two sets of unwinding mechanisms 20 and a first clamping assembly 10. Each set of unwinding mechanisms 20 can work independently, and the free end 20b of the electrode sheet of each unwinding mechanism 20 is transmitted to the next process through the first clamping assembly 10. In this way, once the electrode sheet on any unwinding mechanism 20 is rejected due to unqualified detection, the unwinding is stopped, and the remaining unwinding mechanisms 20 can continue to unwind to keep the electrode sheet continuously output, so that the entire electrode assembly production process can be carried out continuously, and its production efficiency is higher.

[0064] Please refer to Figure 1 In some embodiments, the winding mechanism 100 further includes a linkage mechanism 30 , and the linkage mechanism 30 is used to switch and transmit the pole piece free end 20 b of any one of the unwinding mechanisms 20 to the first clamping assembly 10 .

[0065] It can be understood that the pole piece free end 20b of each unwinding mechanism 20 can be transferred to the first clamping assembly 10 alternately by manual means or by automatic means. Therefore, the linkage mechanism 30 is used to realize the automatic switching and transfer of the pole piece free end 20b of any unwinding mechanism 20 to the first clamping assembly 10.

[0066] For example, the linkage mechanism 30 includes a plurality of mechanical clamping arms, each of which corresponds to a pole piece free end 20 b of the unwinding mechanism 20 , and the mechanical clamping arm can clamp the pole piece free end 20 b of the corresponding unwinding mechanism 20 to the first clamping assembly 10 .

[0067] For example, the linkage mechanism 30 includes a plurality of adjacently arranged guide rollers, each of which can face toward or away from the other, and the free end 20b of the pole piece 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.

[0068] In this way, 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 , and is suitable for outputting the pole piece free end 20 b of each unwinding mechanism 20 in a certain order.

[0069] 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 corresponding pole piece free end 20b of the unwinding mechanism 20 to the first clamping assembly 10.

[0070] 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 transmitted 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 another unwinding mechanism 20 is transmitted and extended into the gap to form a clamped relationship, and then the pole piece free end 20b of the unwinding mechanism 20 is transmitted to the first clamping assembly 10.

[0071] For example, Figures 1 to 6 As shown, Figure 1 A schematic diagram of the structure of a winding mechanism in an initial state provided by an embodiment of the present invention. In the initial state, an unwinding mechanism in the winding mechanism normally transmits the pole piece; Figure 2 A schematic structural diagram of a first working state of a winding mechanism provided by an embodiment of the present invention, wherein the first working state is when an unqualified pole piece is detected in one of the unwinding mechanisms; Figure 3 A schematic structural diagram of a second working state of a winding mechanism provided in an embodiment of the present invention, wherein the second working state is a replacement of a pole piece of another unwinding mechanism; Figure 4 A schematic structural diagram of a third working state of a winding mechanism provided in an embodiment of the present invention, wherein the third working state is when another unwinding mechanism completes feeding; Figure 5 A schematic diagram of the structure of the fourth working state of the winding mechanism provided by an embodiment of the present invention, wherein the fourth working state is that the unwinding mechanism with unqualified electrode pieces collects the unqualified electrode pieces in a single roll; Figure 6 A structural schematic diagram of the fifth working state of the winding mechanism provided in an embodiment of the present invention; the fifth working state is that the unwinding mechanism with unqualified pole pieces is waiting to be replaced and fed again. Two unwinding mechanisms 20 are arranged side by side. In the initial stage, the pole piece free end 20b of one unwinding mechanism 20 is clamped between the first guide roller 31 and the second guide roller 32, and is transmitted to the first clamping assembly 10, while the pole piece free end 20b of the other unwinding mechanism 20 is in a waiting state. When an unqualified pole piece appears in the current unwinding mechanism 20, the first guide roller 31 and the second guide roller 32 are displaced to allow the unqualified pole piece of the current unwinding mechanism 20 to be wound up. At the same time, the pole piece free end 20b of the other unwinding mechanism 20 extends between the first guide roller 31 and the second guide roller 32, and the first guide roller 31 and the second guide roller 32 are restored to a relatively set position state, and the pole piece is transmitted to the first clamping assembly 10.

[0072] Please refer to Figure 1 In some embodiments, the first clamping assembly 10 includes two first clamping plates 11 that are arranged opposite to each other. The two first clamping plates 11 can move toward or away from each other to clamp the pole piece.

[0073] When the clamping action is formed, 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.

[0074] 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 which are arranged in sequence along the pole piece transmission path. The pole piece is unwound from the starting roller 21, passing through the detection mechanism 22, the clamping roller 25 and the waste rejection mechanism 26.

[0075] It can be understood that the starting roller 21 is used to wind the pole piece and unwind it under the action of external pulling force, the detection mechanism 22 is used to detect the electrical capacity of the pole piece, the clamping roller 25 is used to position and clamp the pole piece, and the rejection mechanism 26 is used to reject unqualified pole pieces on the transmission line.

[0076] Please refer to Figure 1 In some embodiments, the unwinding mechanism 20 further includes a metering roller 23 located at a subsequent process position of the detection mechanism 22 .

[0077] The metering roller 23 is used to measure the length of the unwound pole piece to ensure accurate measurement of unqualified pole pieces.

[0078] The metering roller 23 is a roller body with a fixed and known outer diameter. The length of the pole piece in the downstream of the transmission is calculated by winding the pole piece around a quarter or a half of the circumference of the metering roller 23.

[0079] Please refer to Figure 1 In some embodiments, the unwinding mechanism 20 further includes a cache mechanism 24 , and the cache mechanism 24 is used to store the qualified pole pieces for clamping by the first clamping assembly 10 .

[0080] The buffer mechanism 24 may include a plurality of single rollers, each of which is alternately arranged along the transmission direction, and the pole pieces are wound around each of the single rollers in sequence to accumulate a certain number of qualified pole pieces between the first single roller and the last single roller.

[0081] In this way, the cache mechanism 24 can effectively store qualified electrodes, facilitate uninterrupted winding in subsequent processes, and greatly improve winding efficiency.

[0082] Specifically, please refer to Figure 1 In a specific embodiment, the buffer mechanism 24 includes a plurality of reversing rollers 241 , and the pole pieces are wound around each reversing roller 241 in sequence.

[0083] 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 .

[0084] Please refer to Figure 1 In some embodiments, the waste rejection 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.

[0085] The second clamping assembly 261 has two process actions: one is a clamping action to clamp the cut electrode piece, and the other is a pushing action to push the clamped electrode piece to the single roll roller 263 .

[0086] 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 power.

[0087] The cutting component 262 is used to cut off the unqualified pole pieces and separate the unqualified pole pieces from the transmission line.

[0088] 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 pieces, and finally all the unqualified pole pieces are wound on the single winding roller 263.

[0089] In some embodiments, the second clamping assembly 261 includes two second clamping plates 2611 that are arranged opposite to each other. The two second clamping plates 2611 can move toward or away from each other to clamp the pole piece.

[0090] It can be understood that when the clamping action is formed, one of the two second clamping plates 2611 moves toward the other, or the two second clamping plates 2611 move toward each other. Therefore, according to actual use requirements, a mechanism or device for providing clamping force can be configured for one or both of the second clamping plates 2611.

[0091] 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 .

[0092] Specifically, the transmission position of the electrode piece is between the two second clamping plates 2611. After being cut, the two second clamping plates 2611 clamp the cut electrode piece and move toward the single winding roller 263 to wind the cut unqualified electrode piece on the single winding roller 263. At the same time, the two second clamping plates 2611 that have completed the pushing return to the initial position.

[0093] In some embodiments, the cutting assembly 262 includes a cutter 2621 and a resisting member 2622 located on opposite sides of the pole piece, and the cutter 2621 can move toward the resisting member 2622 .

[0094] When the cutter 2621 moves toward the abutting member 2622, it cuts off the pole piece for clamping by the clamping mechanism. Specifically, the cutter 2621 cuts off the unqualified pole piece twice to remove the unqualified pole piece from the transmission line.

[0095] Please refer to Figure 7 In some embodiments, the single roll 263 includes two sub-roller bodies 2631 that are arranged opposite to each other and form a gap for accommodating 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.

[0096] The initial state of the two sub-rollers 2631 is that a gap is formed between them. In the non-winding state, the gap is also used for the pole piece to pass through to meet the transmission requirements. When the second clamping assembly 261 clamps the pole piece and moves toward the two sub-rollers 2631, the two sub-rollers 2631 move toward each other, the gap is closed, and the pole piece is clamped. Then, the two sub-rollers 2631 wind and collect the pole piece in the gap-closed state.

[0097] At the same time, when the pole piece is wound, the extending roller 2632 is in an extended state moving outward with the back ion roller body 2631, 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.

[0098] 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.

[0099] Specifically, the first clamping assembly 10 includes two first clamping plates 11 that are arranged opposite to each other. The two first clamping plates 11 can move toward or away from each other to clamp the pole piece.

[0100] The unwinding mechanism 20 includes a starting roller 21, a detection mechanism 22, a metering roller 23, a buffer mechanism 24, a clamping roller 25 and a waste rejection mechanism 26 which are arranged in sequence along the pole piece transmission path. The pole piece is unwound from the starting roller 21, passing through the detection mechanism 22, the metering roller 23, the buffer mechanism 24, the clamping roller 25 and the waste rejection mechanism 26.

[0101] The starting roller 21 is used to wind the pole piece and unwind it under the action of external pulling force. The detection mechanism 22 is used to detect the electrical capacity of the pole piece. The clamping roller 25 is used to position and clamp the pole piece. The rejection mechanism 26 is used to reject unqualified pole pieces on the transmission line.

[0102] The metering roller 23 is used to measure the length of the unwound pole piece to meet the accurate measurement of unqualified pole pieces. The metering roller 23 is a roller body with a certain and known outer diameter. The length of the pole piece transmitted downstream is calculated by winding the pole piece around a quarter or half of the circumference of the metering roller 23.

[0103] The buffer mechanism 24 may include a plurality of reversing rollers 241 , each of which is alternately arranged along the transmission direction, and the pole pieces are sequentially wound around each of 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 .

[0104] The waste rejection mechanism 26 comprises 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.

[0105] The second clamping assembly 261 has two process actions: one is a clamping action to clamp the cut electrode piece, and the other is a pushing action to push the clamped electrode piece to the single roll roller 263 .

[0106] 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 power.

[0107] The cutting component 262 is used to cut off the unqualified pole pieces and separate the unqualified pole pieces from the transmission line.

[0108] 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 pieces, and finally all the unqualified pole pieces are wound on the single winding roller 263.

[0109] The second clamping assembly 261 includes two second clamping plates 2611 that are arranged opposite to each other. The two second clamping plates 2611 can move toward or away from each other to clamp the pole piece.

[0110] The cutting assembly 262 includes a cutter 2621 and a resisting member 2622 located at two opposite sides of the pole piece. The cutter 2621 can move toward the resisting member 2622 .

[0111] The single roll 263 includes two sub-roller bodies 2631 which are arranged opposite to each other and form a gap for accommodating the pole pieces. The two sub-roller bodies 2631 can move toward or away from each other. At least one of the sub-roller bodies 2631 is provided with an extension roller 2632 which can move away from or toward the corresponding sub-roller body 2631.

[0112] The initial state of the two sub-rollers 2631 is that a gap is formed between them. In the non-winding state, the gap is also used for the pole piece to pass through to meet the transmission requirements. When the second clamping assembly 261 clamps the pole piece and moves toward the two sub-rollers 2631, the two sub-rollers 2631 move toward each other, the gap is closed, and the pole piece is clamped. Then, the two sub-rollers 2631 wind and collect the pole piece in the gap-closed state.

[0113] At the same time, when the pole piece is wound, the extending roller 2632 is in an extended state moving outward with the back ion roller body 2631, 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.

[0114] 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 corresponding pole piece free end 20b of the unwinding mechanism 20 to the first clamping assembly 10.

[0115] In the initial stage, the free end 20b of the pole 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 pole piece of the other unwinding mechanism 20 is in a waiting state. When an unqualified pole piece appears in the current unwinding mechanism 20, the first guide roller 31 and the second guide roller 32 are displaced to allow the unqualified pole piece of the current unwinding mechanism 20 to be rewound. At the same time, the free end 20b of the pole piece of the other unwinding mechanism 20 extends between the first guide roller 31 and the second guide roller 32, and the first guide roller 31 and the second guide roller 32 resume the relative setting position state, and transfer the pole piece to the first clamping assembly 10.

[0116] In a second aspect, an embodiment of the present application further provides a winding device, comprising the above-mentioned winding mechanism 100.

[0117] The winding device provided by the present invention has an upper winding mechanism 100, and the winding device has a higher winding efficiency.

[0118] Of course, the winding device also includes other mechanical parts, such as a diaphragm winding roller for winding up the diaphragm, a pressing roller for realizing the composite of the electrode sheet and the diaphragm, and a winding roller for winding up the finished electrode assembly.

[0119] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A winding mechanism, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: Comprising a winding mechanism as claimed in any one of claims 1 to 12.

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