Battery pole piece winding and changing system and changing control method

Abstract

The application discloses a battery pole piece winding and roll changing system and a roll changing control method. The system comprises a first winding mechanism and a second winding mechanism, both of which are provided with winding drums, and the surfaces of the winding drums are provided with double-sided adhesive tapes; a roller assembly; a belt connecting device, which comprises a moving mechanism, a pressing roller and a cutter mechanism. The moving mechanism drives the pressing roller to press the battery pole piece against the double-sided adhesive tape of the empty winding drum. The cutter mechanism is used for cutting the battery pole piece between the pressing roller and the full winding drum; a tension maintaining mechanism, which is used for driving the battery pole piece located behind the roller assembly to maintain a preset tension; and a tension detecting mechanism, which is used for detecting the tension data of the battery pole piece between the empty winding drum and the roller assembly. The battery pole piece winding and roll changing system and the roll changing control method can wind the battery pole piece only after the tension of the battery pole piece after the belt connection reaches the transmission requirement, so that the retraction of the battery pole piece is avoided, and the machining precision of the previous process is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a battery electrode winding and changing system and a changing control method. Background Technology

[0002] With the continued surge in demand for energy storage batteries, the pressure to deliver battery production capacity is constantly increasing. The winding of battery electrodes is a crucial step in battery production, and its winding efficiency has become one of the bottlenecks restricting the release of overall production capacity.

[0003] Generally, battery electrodes undergo processes such as tab cutting, slitting, and pattern etching before winding. These processes require extremely high tension on the battery electrodes. Therefore, multiple power transmission rollers with equal speeds are usually installed along the conveying direction of the battery electrodes. The winding and changing system includes two winding mechanisms. When one winding mechanism reaches full roll, the battery electrode needs to be cut. Then, the end of the battery electrode connected to the previous process is fixed to the empty spool of the other winding mechanism with double-sided adhesive to complete the splicing. The empty spool then continues to wind up the battery electrode that has completed the previous process.

[0004] However, in order to ensure a firm bond between the empty tube and the end of the battery electrode, the double-sided tape has a certain width. The end of the battery electrode overlaps with the entire area of ​​the double-sided tape to form a surface contact. During the tape splicing process and when the tape splicing is completed, the tension between the empty tube and the battery electrode closest to the previous process cannot meet the requirements of production and processing. This causes the battery electrode in the previous process to loosen or wrinkle, resulting in insufficient processing accuracy or defective products.

[0005] Furthermore, current winding and changing systems typically employ a swing arm mechanism to pull the battery electrodes from one side of a full roll to the other side of an empty roll. Then, a splicing assembly adheres the electrodes to double-sided tape, and a cutting assembly cuts the electrodes. The cutting assembly requires a drive mechanism to move relative to the splicing assembly, thus avoiding it during the splicing operation. However, this results in a large number of components and a complex structure on the swing arm mechanism, placing a significant load on it. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery electrode winding and changing system that ensures the tension of the battery electrode reaches the transmission requirements after the electrode is attached, thus preventing the battery electrode from shrinking back and affecting the processing accuracy of the preceding process. Another objective is to provide a changing control method using this battery electrode winding and changing system.

[0007] A battery electrode winding and changing system according to a first aspect embodiment of the present invention includes: A first winding mechanism and a second winding mechanism are arranged at intervals. Both the first winding mechanism and the second winding mechanism are detachably equipped with winding drums. The surface of the winding drums is pre-loaded with double-sided adhesive tape. A roller assembly guides the processed battery electrodes onto the take-up drum; The tape receiving device includes a moving mechanism, a pressure roller, and a cutting mechanism. The moving mechanism drives the pressure roller to press the battery electrode sheet on it against the double-sided tape of an empty take-up drum. The cutting mechanism is used to cut the battery electrode sheet located between the pressure roller and the fully wound take-up drum. A tension holding mechanism is used to drive the battery electrode located behind the roller assembly to maintain a preset tension. The tension detection mechanism is used to detect the tension data of the battery electrode between the unloaded winding drum and the roller assembly. It is electrically connected to the first winding mechanism and the second winding mechanism and can control the unloaded winding drum to rotate until the tension data of the battery electrode reaches the set value.

[0008] The battery electrode winding and changing system according to the first aspect of the present invention has at least the following beneficial effects: When one of the take-up drums reaches or is close to full roll, the tension holding mechanism drives the battery electrode sheet located behind the roller assembly to maintain a preset tension. The moving mechanism drives the pressure roller to press the battery electrode sheet against the double-sided tape of the empty take-up drum. The cutting mechanism cuts the battery electrode sheet between the pressure roller and the full roll. After the empty take-up drum rotates in both directions to complete the tape splicing and the tension data of the battery electrode sheet between the empty take-up drum and the roller assembly reaches the set value, the tension holding mechanism no longer intervenes until the empty take-up drum winds the battery electrode sheet to full roll. The above battery electrode sheet take-up and rewinding system can only be wound after the tension of the battery electrode sheet after splicing reaches the transmission requirements, ensuring that the battery electrode sheet will not shrink back to avoid affecting the processing accuracy of the previous process.

[0009] In some embodiments of the present invention, the first winding mechanism and the second winding mechanism are respectively provided with a first motor and a second motor for driving the corresponding winding drum to rotate. The sides of the first winding mechanism and the second winding mechanism are each provided with a first sensor for detecting the angular position of the double-sided tape and a second sensor for detecting the outer diameter of the battery electrode on the winding drum. The position where the pressure roller contacts the unloaded winding drum is the tape-joining station. The portion from one end of the cut battery electrode to the tape-joining station is the section to be bonded. The first motor or the second motor rotates in a first clockwise direction to bond the double-sided tape to the section to be bonded. The first motor or the second motor rotates in a second clockwise direction until the tension data of the battery electrode between the unloaded winding drum and the roller assembly reaches a set value.

[0010] In some embodiments of the present invention, the width of the double-sided tape is equal to the width of the section to be bonded.

[0011] In some embodiments of the present invention, the roller assembly includes a common roller, a first roller located between the common roller and the first winding mechanism, and a second roller located between the common roller and the second winding mechanism. The tension holding mechanism includes a pressing assembly that presses and fixes the battery electrode sheet to the outer peripheral wall of the common roller. During the process in which the moving mechanism drives the pressure roller to press the battery electrode sheet against the double-sided tape, the first motor or the second motor rotates to release a portion of the battery electrode sheet from the fully wound winding cylinder so that the battery electrode sheet is taut against the double-sided tape.

[0012] In some embodiments of the present invention, the roller assembly includes a plurality of transfer rollers, and the tension holding mechanism includes a buffer assembly disposed between two of the transfer rollers. During the bonding process of the double-sided tape and the section to be bonded, the buffer assembly is capable of storing the continuously forward-feeding battery electrode located behind the roller assembly.

[0013] In some embodiments of the present invention, the tension detection mechanism includes a torque detection unit and a calculation module connected to the torque detection unit. The torque detection unit can detect the torque value applied to the winding drum by the first motor or the second motor. The calculation module calculates the tension data of the battery electrode based on the torque value and the diameter of the unloaded winding drum. Alternatively, the tension detection mechanism includes two tension detection rollers respectively disposed between the roller assembly and the first winding mechanism, and between the roller assembly and the second winding mechanism. Four sets of strain gauges are evenly arranged circumferentially inside the tension detection rollers to form a full-bridge circuit. The full-bridge circuit is connected to a signal processing module. When the battery electrode passes through the tension detection rollers, the strain gauges generate strain. The signal processing module converts and outputs the tension data of the battery electrode.

[0014] In some embodiments of the present invention, after the battery electrode sheet is pressed against the double-sided tape, the cutting mechanism cuts the battery electrode sheet, and the empty winding drum begins to wind the battery electrode sheet, the moving mechanism drives the pressure roller to remain pressed against the battery electrode sheet for a certain period of time to limit the separation of the battery electrode sheet and the double-sided tape.

[0015] In some embodiments of the present invention, the first winding mechanism and the second winding mechanism are distributed left and right. The moving mechanism includes an X-axis linear module arranged along the left and right direction and a Y-axis linear module disposed at the output end of the X-axis linear module. The Y-axis linear module is provided with a rotary motor and a swing arm connected to the output end of the rotary motor. The pressure roller is rotatably disposed on the swing arm, and the cutter mechanism is movably disposed on the swing arm.

[0016] In some embodiments of the present invention, the winding drum is arranged axially along the front-back direction, the swing arm is provided with a mounting frame arranged along the front-back direction, a plurality of pressure rollers are circumferentially distributed around an axis extending in the front-back direction on the mounting frame, and all the pressure rollers form an accommodating space, the cutting mechanism includes a telescopic driver and a blade connected to the output end of the telescopic driver, the telescopic driver drives the blade to extend or retract into the accommodating space along the area between two of the pressure rollers.

[0017] In some embodiments of the present invention, the mounting frame includes a central rod extending in a front-rear direction and a first end plate and a second end plate disposed at both ends of the central rod. The length direction of the blade is parallel to the central rod. The telescopic actuator includes two cylinders fixedly mounted on the central rod and connected to both ends of the blade. The two ends of the pressure roller are respectively connected to the outer peripheral edge of the first end plate and the outer peripheral edge of the second end plate, such that all the pressure rollers surround the outer periphery of the central rod.

[0018] In some embodiments of the present invention, the first end plate and / or the second end plate are provided with an adjustment groove, and the end of the pressure roller is provided with an adjustment block movably disposed within the adjustment groove. The width and height dimensions of the adjustment groove are both greater than the width and height dimensions of the adjustment block. The first end plate or the second end plate is provided with a displacement adjustment component for adjusting the relative position of the adjustment block within the adjustment groove.

[0019] In some embodiments of the present invention, the displacement adjustment assembly includes a first fastening screw passing through the height direction of the adjustment block, a first threaded push rod threadedly connected along the height direction of the adjustment block, a second fastening screw passing through the width direction of the adjustment block, and a second threaded push rod threadedly connected along the width direction of the adjustment block. The bottom of the adjustment groove is provided with a first threaded hole that mates with the first fastening screw, and the side wall of the adjustment groove is provided with a second threaded hole that mates with the second fastening screw. When the first threaded push rod and the second threaded push rod rotate, they abut against the wall of the adjustment groove, driving the adjustment block to move along the height and depth directions of the adjustment groove.

[0020] In some embodiments of the present invention, a strip-shaped protective plate is installed in the area between the two pressure rollers opposite the blade edge, and the strip-shaped protective plate has through-hole grooves that match the thickness of the blade.

[0021] In some embodiments of the present invention, a tail adhesive bonding mechanism is also included. After the cutting mechanism cuts the battery electrode sheet, the first winding mechanism or the second winding mechanism drives the tail material of the battery electrode sheet to be wound onto a fully wound winding drum. The tail adhesive bonding mechanism then attaches and fixes the tail of the battery electrode sheet onto the winding drum.

[0022] According to a second aspect of the present invention, a rewinding control method for battery electrode sheets, and a rewinding system applying any of the above-described technical solutions, includes the following steps: Step S1: When the winding drum of one of the first winding mechanism and the second winding mechanism reaches or is close to full, the empty winding drum of the other mechanism rotates until the double-sided tape is at the set angle position, and the tape splicing device is ready to work. Step S2: Before or during the operation of the tape splicing device, the tension holding mechanism drives the battery electrode located behind the roller assembly to maintain a preset tension. When the tape splicing device is working, the moving mechanism drives the pressure roller to press the battery electrode on it against the double-sided tape of the empty take-up drum. At this time, one side of the double-sided tape is located on the contact line between the pressure roller and the empty take-up drum. Then, the cutting mechanism cuts off the battery electrode located between the pressure roller and the fully wound take-up drum. The part from the end of the cut battery electrode to the contact line between the pressure roller and the empty take-up drum constitutes the section to be bonded. In step S3, the first winding mechanism or the second winding mechanism drives the unloaded winding drum to rotate so that all the double-sided tape is pasted on the section to be bonded. During this process, the tension holding mechanism continues to work. Then, the unloaded winding drum rotates in the opposite direction to tension the battery electrode. When the tension detection mechanism detects that the tension data of the battery electrode between the unloaded winding drum and the roller assembly reaches the set value, the tension holding mechanism stops working until the unloaded winding drum winds the battery electrode to a full roll.

[0023] According to a second aspect embodiment of the present invention, a roll-changing control method has at least the following beneficial effects: The above-mentioned roll-changing control method, based on the automatic tape splicing and roll changing when the winding drum is full, ensures that the battery electrode sheet can only be wound up after the tension of the spliced ​​tape reaches the transmission requirements. This ensures that the battery electrode sheet will not shrink back to avoid affecting the processing accuracy of the previous process and to prevent some of the battery electrode sheets from being defective due to roll changing in continuous production.

[0024] In some embodiments of the present invention, the roller assembly includes a common roller, a first roller located between the common roller and the first winding mechanism, and a second roller located between the common roller and the second winding mechanism. The tension holding mechanism includes a pressing assembly. In step S2, before the tape splicing device operates, the pressing assembly presses and fixes the battery electrode sheet to the outer peripheral wall of the common roller. The fully loaded winding drum stops rotating, and the battery electrode sheet located behind the common roller stops being transmitted and maintains a preset tension. During the process of the moving mechanism driving the pressure roller to press the battery electrode sheet against the double-sided tape of the empty winding drum, the fully loaded winding drum rotates to release part of the battery electrode sheet so that the battery electrode sheet can remain taut against the double-sided tape. When the tension detection mechanism detects that the tension data of the battery electrode sheet between the empty winding drum and the roller assembly reaches a set value, the pressing assembly separates from the battery electrode sheet, and then the empty winding drum winds the battery electrode sheet until it is fully wound.

[0025] In some embodiments of the present invention, the roller assembly includes a plurality of transfer rollers, and the tension holding mechanism includes a buffer assembly disposed between two of the transfer rollers; when the winding drum of one of the first winding mechanism and the second winding mechanism is close to a full roll, the empty winding drum of the other mechanism rotates until the double-sided tape is at a set angle position, and the nearly full roll winding drum continues to rotate. Before the tape splicing device operates, the transmission speed of the battery electrode sheet behind the roller assembly and the linear speed of the winding drum winding the battery electrode sheet are both V1. The moving mechanism drives the pressure roller to press the battery electrode sheet against the empty winding drum. During the double-sided tape process, the linear speed of the winding drum winding the battery electrode sheet decreases from V1 to V2 to compensate for the displacement caused by the moving mechanism driving the battery electrode sheet, while maintaining the tension data of the battery electrode sheet unchanged. As the unloaded winding drum rotates to ensure that all the double-sided tape is adhered to the section to be bonded, the battery electrode sheet tends to loosen as it shifts backward. The buffer component works synchronously to buffer part of the battery electrode sheet between the two transfer rollers. The buffer component works based on the data fed back by the tension detection mechanism to keep the battery electrode sheet always at the set tension data. Then, the unloaded winding drum rotates in the opposite direction to wind the battery electrode sheet.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a first embodiment of the battery electrode winding and changing system of the present invention; Figure 2This is a schematic diagram of a second embodiment of the battery electrode winding and changing system of the present invention; Figure 3 This diagram illustrates the process of a battery electrode rewinding and changing system bringing a fully loaded rewinding spool of battery electrodes against an unloaded rewinding spool. Figure 4 A schematic diagram of one embodiment of the tape-connecting device; Figure 5 A schematic diagram of the combined cutting mechanism and mounting bracket; Figure 6 A schematic diagram showing the structure in which one end of the pressure roller is mounted on the second end plate; Figure 7 for Figure 6 A magnified view of part A.

[0028] Icon labels: 10 section to be bonded; 100 first winding mechanism; 200 second winding mechanism; 300 winding drum; 310 double-sided adhesive tape; 400 roller assembly; 410 common roller; 420 first roller; 430 second roller; 440 transfer roller; 500 tape receiving device; 510 moving mechanism; 511 X-axis linear module; 512 Y-axis linear module; 513 rotary motor; 514 swing arm; 520 pressure roller; 521 first pressure roller; 522 second pressure roller; 523 third pressure roller. Fourth pressure roller 524; Adjusting block 525; Cutting mechanism 530; Telescopic driver 531; Blade 532; Strip protective plate 533; Through-hole knife groove 534; Mounting bracket 540; Center rod 541; First end plate 542; Second end plate 543; Adjustment groove 550; Tension holding mechanism 600; First sensor 710; Second sensor 720; First fastening screw 810; First threaded push rod 820; Second fastening screw 830; Second threaded push rod 840. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0032] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0033] See Figures 1 to 3 The present invention discloses a battery electrode rewinding and changing system, comprising: a first rewinding mechanism 100 and a second rewinding mechanism 200 arranged at intervals, both the first rewinding mechanism 100 and the second rewinding mechanism 200 being detachably mounted with a rewinding drum 300, the surface of the rewinding drum 300 being pre-loaded with double-sided adhesive tape 310; a roller assembly 400 for guiding the processed battery electrode sheets onto the rewinding drum 300; and a tape receiving device 500, including a moving mechanism 510, a pressure roller 520, and a cutting mechanism 530, wherein the moving mechanism 510 drives the pressure roller 520 to press the battery electrode sheets on it against the unloaded rewinding drum 300. On the double-sided tape 310 of the roll 300, a cutting mechanism 530 is used to cut the battery electrode between the pressure roller 520 and the fully wound take-up roll 300; a tension holding mechanism 600 is used to drive the battery electrode located behind the roller assembly 400 to maintain a preset tension; a tension detection mechanism is used to detect the tension data of the battery electrode between the unloaded take-up roll 300 and the roller assembly 400, and is electrically connected to the first take-up mechanism 100 and the second take-up mechanism 200, and can control the unloaded take-up roll 300 to rotate until the tension data of the battery electrode reaches the set value.

[0034] When one of the take-up spools 300 reaches or is close to full roll, the tension holding mechanism 600 drives the battery electrode sheet located behind the roller assembly 400 to maintain a preset tension. The moving mechanism 510 drives the pressure roller 520 to press the battery electrode sheet against the double-sided tape 310 of the unloaded take-up spool 300. The cutting mechanism 530 cuts the battery electrode sheet between the pressure roller 520 and the full roll of the take-up spool 300. After the unloaded take-up spool 300 rotates forward and backward to complete the tape connection and the tension data of the battery electrode sheet between the unloaded take-up spool 300 and the roller assembly 400 reaches the set value, the tension holding mechanism 600 no longer intervenes until the unloaded take-up spool 300 winds the battery electrode sheet to a full roll. The above battery electrode sheet take-up and change-up system can only be taken up after the tension of the battery electrode sheet after tape connection reaches the transmission requirements, ensuring that the battery electrode sheet will not shrink back to avoid affecting the processing accuracy of the previous process.

[0035] The term "rear" refers to the direction in which the battery electrode sheets are conveyed, while the direction in which the battery electrode sheets move toward the winding drum 300 is considered the front.

[0036] See Figure 1 and Figure 2 In some embodiments of the present invention, the first winding mechanism 100 and the second winding mechanism 200 are respectively provided with a first motor and a second motor for driving the corresponding winding drum 300 to rotate. The sides of both the first winding mechanism 100 and the second winding mechanism 200 are provided with a first sensor 710 for detecting the angular position of the double-sided tape 310 and a second sensor 720 for detecting the outer diameter of the battery electrode sheet on the winding drum 300. The position where the pressure roller 520 contacts the unloaded winding drum 300 is the tape-joining station. The portion from one end of the cut battery electrode sheet to the tape-joining station is the bonding section 10. The first motor or the second motor rotates in a first clockwise direction to bond the double-sided tape 310 to the bonding section 10. The first motor or the second motor rotates in a second clockwise direction until the tension data of the battery electrode sheet between the unloaded winding drum 300 and the roller assembly 400 reaches a set value. It should be noted that if one of the first clockwise direction and the second clockwise direction is clockwise, the other is counterclockwise.

[0037] See Figure 1 or Figure 2 Taking the winding drum 300 on the first winding mechanism 100 as empty and the winding drum 300 on the second winding mechanism 200 as fully wound as an example, the second motor rotates clockwise for winding, and the first motor rotates counterclockwise for winding. It can be understood that when the second sensor 720 detects that the outer diameter of the winding drum 300 on the second winding mechanism 200 reaches a set value, the first motor drives the empty winding drum 300 to rotate slowly. When the first sensor 710 detects the double-sided tape 310, the first motor rotates a preset angle and stops, so that the double-sided tape 310 is at the angle position required for the tape splicing station. The moving mechanism 510 drives the pressure roller 520 to press the battery electrode against one side of the double-sided tape 310 to form line contact. Then, the cutting mechanism 530 cuts the battery electrode to form the bonding section 10. The first motor rotates clockwise... The needle rotates to make the double-sided tape 310 and the section to be bonded 10 form a surface contact. During this process, the tension holding mechanism 600 drives the battery electrode behind the roller assembly 400 to maintain a preset tension. Then, the first motor rotates counterclockwise to make the tension data of the battery electrode between the unloaded winding cylinder 300 and the roller assembly 400 reach the set value. After that, the tension holding mechanism 600 does not need to act on the battery electrode. The first motor continues to rotate counterclockwise to realize the winding of the battery electrode after the roll change. The battery electrode winding and changing system with the above structure realizes the function of fully automatic tape splicing and roll changing.

[0038] in, Figure 1 and Figure 2 The dashed line in the diagram represents the path of the battery electrode against the double-sided tape of the unloaded take-up spool.

[0039] In a preferred embodiment of the present invention, the width of the double-sided tape 310 is equal to the width of the section 10 to be bonded, thereby preventing a portion of the section 10 to be bonded from being unbonded and fixed to the double-sided tape 310, and preventing the section 10 to be bonded from being partially torn apart from the double-sided tape 310 due to centrifugal force when rotating with the unloaded take-up drum 300.

[0040] See Figure 1 In some embodiments of the present invention, the roller assembly 400 includes a common roller 410, a first roller 420 located between the common roller 410 and the first winding mechanism 100, and a second roller 430 located between the common roller 410 and the second winding mechanism 200. The tension holding mechanism 600 includes a pressing assembly that presses and fixes the battery electrode sheet to the outer peripheral wall of the common roller 410. During the process of the moving mechanism 510 driving the pressure roller 520 to press the battery electrode sheet against the double-sided tape 310, the first motor or the second motor rotates to release a portion of the fully wound winding cylinder 300 battery electrode sheet so that the battery electrode sheet is taut against the double-sided tape 310.

[0041] Taking the winding drum 300 of the first winding mechanism 100 as empty and the winding drum 300 of the second winding mechanism 200 as full as an example, it can be understood that when the battery electrode needs to be changed, the clamping assembly clamps and fixes the battery electrode to the outer peripheral wall of the common guide roller 410, the second motor stops rotating, and the battery electrode located behind the common guide roller 410 stops being transmitted and maintains the preset tension. During the process of the moving mechanism 510 driving the pressure roller 520 to press the battery electrode against the double-sided tape 310 of the empty winding drum 300, the second motor rotates... The mechanism releases some of the battery electrode sheets, allowing them to remain taut against the double-sided adhesive tape 310. The cutting mechanism 530 cuts the battery electrode sheets to form the bonding section 10. Then, the first motor rotates clockwise to bond the double-sided adhesive tape 310 to the bonding section 10. The first motor then rotates counterclockwise by a certain angle. When the tension detection mechanism detects that the tension data of the battery electrode sheets between the unloaded winding drum 300 and the roller assembly 400 reaches a set value, the clamping assembly separates from the battery electrode sheets. The first motor continues to rotate counterclockwise to wind the battery electrode sheets until a full roll is reached. This tension holding mechanism 600 is relatively simple, with low difficulty in attaching and changing rolls, and is easy to operate.

[0042] See Figure 2In some embodiments of the present invention, the roller assembly 400 includes a plurality of transfer rollers 440, and the tension holding mechanism 600 includes a buffer assembly disposed between two of the transfer rollers 440. During the process of bonding the double-sided tape 310 to the section 10 to be bonded, the buffer assembly is able to store the continuously forward-carrying battery electrode located behind the roller assembly 400.

[0043] Taking the winding drum 300 on the first winding mechanism 100 as empty and the winding drum 300 on the second winding mechanism 200 as nearly full as an example, the first motor rotates until the double-sided tape 310 is at the angle position required for the tape splicing station, and the second motor continues to rotate. The transmission speed of the battery electrode behind the roller assembly 400 and the linear speed of the winding drum 300 winding the battery electrode are both V1. During the process of the moving mechanism 510 driving the pressure roller 520 to press the battery electrode against the double-sided tape 310 of the empty winding drum 300, the speed of the second motor decreases, causing the linear speed of the winding drum 300 winding the battery electrode to decrease from V1 to V2 to compensate for the movement of the moving mechanism. The displacement of the battery electrode sheet driven by the structure 510 to the splicing station is as follows: The transmission speed of the battery electrode sheet located behind the roller assembly 400 remains constant, and the tension data of the battery electrode sheet remains constant. Then, the first motor drives the unloaded take-up drum 300 to rotate so that the double-sided adhesive tape 310 is adhered to the section 10 to be bonded. During this process, the battery electrode sheet moves backward, and the buffer assembly works synchronously to buffer a portion of the battery electrode sheet between the two transmission rollers 440. The buffer assembly works based on the data fed back by the tension detection mechanism to keep the battery electrode sheet always at the set tension data. Then, the first motor drives the unloaded take-up drum 300 to rotate in the opposite direction to wind up the battery electrode sheet. Through the above structure and control method, the splicing and roll changing of battery electrode sheets can be completed without stopping the production line and the nearly full roll of take-up drum 300, enabling continuous production and thus improving production efficiency.

[0044] For example, see Figure 2 In this embodiment, the buffer component includes a rotating arm and a pressure roller disposed at one end of the rotating arm. The stroke of the rotating arm driving the pressure roller against the battery electrode is used to compensate for the backward stroke of the battery electrode during the process of the bonding section 10 being pasted onto the double-sided tape 310.

[0045] In one embodiment of the present invention, the tension detection mechanism includes a torque detection unit and a calculation module connected to the torque detection unit. The torque detection unit can detect the torque value applied to the winding drum 300 by the first motor or the second motor. The calculation module calculates the tension data of the battery electrode based on the torque value and the diameter of the unloaded winding drum 300. The above tension detection mechanism does not require a contact-type tension sensor, and has a simple structure and low cost.

[0046] In another embodiment of the present invention, the tension detection mechanism includes two tension detection rollers respectively disposed between the roller assembly 400 and the first winding mechanism 100, and between the roller assembly 400 and the second winding mechanism 200. Four sets of strain gauges are evenly arranged circumferentially inside the tension detection rollers to form a full-bridge circuit. The full-bridge circuit is connected to a signal processing module. When the battery electrode passes through the tension detection rollers, the strain gauges generate strain. The signal processing module converts the strain data to obtain the tension data of the battery electrode. This tension detection mechanism is not affected by mechanical transmission friction during winding and can accurately identify minute tension fluctuations in the battery electrode, resulting in higher detection accuracy.

[0047] In some embodiments of the present invention, after the battery electrode sheet abuts against the double-sided tape 310, the cutting mechanism 530 cuts the battery electrode sheet, and the empty winding drum 300 begins to wind the battery electrode sheet, the moving mechanism 510 drives the pressure roller 520 to remain abutting against the battery electrode sheet for a certain period of time, for example, so that the battery electrode sheet is wound around the winding drum 300 several times, and then the pressure roller 520 separates from the battery electrode sheet located on the outer ring, thereby restricting the separation of the battery electrode sheet and the double-sided tape 310 and ensuring that the battery electrode sheet is wound normally.

[0048] See Figure 1 , Figure 2 and Figure 4 In some embodiments of the present invention, the first winding mechanism 100 and the second winding mechanism 200 are distributed left and right. The moving mechanism 510 includes an X-axis linear module 511 arranged along the left and right direction and a Y-axis linear module 512 disposed at the output end of the X-axis linear module 511. The Y-axis linear module 512 is provided with a rotary motor 513 and a swing arm 514 connected to the output end of the rotary motor 513. The pressure roller 520 is rotatably disposed on the swing arm 514, and the cutter mechanism 530 is movably disposed on the swing arm 514. It should be noted that the X-axis linear module 511 drives the rotary motor 513 and the swing arm 514 to translate, and the swing arm 514 rotates in coordination to pull the battery electrode sheets on the fully wound take-up spool 300 to the splicing station of the empty take-up spool 300. After the battery electrode sheets have been cut and spliced, the X-axis linear module 511 and the swing arm 514 move to drive the splicing device 500 to separate from the battery electrode sheets. Then, the Y-axis linear module 512 drives the pressure roller 520 to move in the width direction of the battery electrode sheets. On the outside, the swing arm 514 drives the pressure roller 520 to swing to the inside of the battery electrode. The Y-axis linear module 512 drives the pressure roller 520 to move until the pressure roller 520 overlaps in the width direction of the battery electrode. When the empty winding drum 300 winds the battery electrode to a full roll, the X-axis linear module 511 and the rotary motor 513 work together to pull the battery electrode on the full roll of winding drum 300 to the empty winding drum 300 on the other side, thereby realizing the function of reversing and connecting the belt.

[0049] See Figure 4 , Figure 5 and Figure 6 In some embodiments of the present invention, the winding drum 300 is arranged axially along the front-rear direction, and the swing arm 514 is provided with a mounting frame 540 arranged along the front-rear direction. Multiple pressure rollers 520 are circumferentially distributed around an axis extending front-rearly on the mounting frame 540 at intervals, forming an accommodating space between all the pressure rollers 520. The cutting mechanism 530 includes a telescopic actuator 531 disposed within the accommodating space and a blade 532 connected to the output end of the telescopic actuator 531. The telescopic actuator 531 drives the blade 532 to extend or retract into the accommodating space along the area between two pressure rollers 520. See also Figure 1 , Figure 2 and Figure 4 When one of the take-up drums 300 reaches full winding, the rotary motor 513 drives the swing arm 514 to rotate, causing the pressure roller 520 to abut against the battery electrode. Combined with the movement of the moving mechanism 510, this pulls the battery electrode to the splicing station. One of the pressure rollers 520 presses the battery electrode against the pre-set double-sided adhesive tape 310 of the unloaded take-up drum 300. At this time, the battery electrodes on both sides of the pressure roller 520 are wrapped around at least one other pressure roller 520, so that the battery electrodes on both sides of the splicing station are in a taut state. The telescopic driver 531 drives the blade 532 to extend from the area between the two pressure rollers 520 on one side of the splicing station, thereby cutting the battery electrode and resulting in a clean cut. See also Figure 3 During the movement of the moving mechanism 510 and the swing arm 514, the battery electrode can come into contact with one or more pressure rollers 520 at different positions and smoothly pull the battery electrode. The telescopic driver 531 drives the blade 532 to retract into the interior of the accommodating space. The blade 532 does not need to use a complex mechanism to avoid the pressure rollers 520, thereby reducing the steps during the tape splicing operation, which helps to improve the speed of tape splicing and roll changing, and also helps to simplify the structure and reduce the load on the swing arm 514.

[0050] See Figure 3 and Figure 4In this embodiment, there are four pressure rollers 520, which are evenly spaced and arranged in a circle. When one of the pressure rollers 520 presses the battery electrode against the pre-set double-sided tape 310 on the unloaded take-up spool 300, the position where the battery electrode contacts the take-up spool 300 is the tape-joining station. The battery electrode also abuts against two pressure rollers 520 located above and below the tape-joining station. At this time, the battery electrode forms a 90° opening angle near the tape-joining station. The battery electrodes located above and below the tape-joining station are both in a tensioned state, which is beneficial for providing a regular accommodating space for the blade 532 and the telescopic actuator 531, and also for the blade 532 to form a flat cut on the battery electrode when it extends. Preferably, all four pressure rollers 520 can rotate around their own central axis, thereby reducing the frictional resistance of the battery electrode passing over the surface of the pressure rollers 520. For ease of understanding, see Figure 3 The four pressure rollers 520 are respectively labeled as the first pressure roller 521, the second pressure roller 522, the third pressure roller 523, and the fourth pressure roller 524 arranged in a clockwise direction. Taking the winding drum 300 on the first winding mechanism 100 as unloaded and the winding drum 300 on the second winding mechanism 200 as close to or reaching full winding as an example, Figure 3 As shown, four states are listed where the battery electrode sheet is pulled from a fully wound take-up spool 300 to an unloaded take-up spool 300. In state one, the second pressure roller 522 and the third pressure roller 523 are close to the battery electrode sheet. When the swing arm 514 rotates counterclockwise to state two, the third pressure roller 523 first contacts the battery electrode sheet, and then the third pressure roller 523 and the fourth pressure roller 524 simultaneously contact the battery electrode sheet. When the swing arm 514 rotates counterclockwise to state three, the third pressure roller 523 separates from the battery electrode sheet. At this time, the fourth pressure roller 524 and the first pressure roller 521 simultaneously contact the battery electrode sheet. Finally, when the swing arm 514 rotates counterclockwise and the X-axis linear module 511 moves to the left to state four, the fourth pressure roller 524 presses the battery electrode sheet against the outer peripheral wall of the unloaded take-up spool 300. The battery electrode sheet also passes around the first pressure roller 521 and the third pressure roller 523.

[0051] See Figure 5In some embodiments of the present invention, the mounting frame 540 includes a central rod 541 extending in the front-rear direction and a first end plate 542 and a second end plate 543 disposed at both ends of the central rod 541. The length direction of the blade 532 is parallel to the central rod 541. The telescopic actuator 531 includes two cylinders fixedly mounted on the central rod 541 and connected to both ends of the blade 532. The two ends of the pressure roller 520 are respectively connected to the outer peripheral edges of the first end plate 542 and the second end plate 543, so that all the pressure rollers 520 surround the outer periphery of the central rod 541. It can be understood that both ends of all the pressure rollers 520 are connected and fixed between the first end plate 542 and the second end plate 543 and surround the outer periphery of the central rod 541 to form a circle, which not only forms an accommodating space but also forms a closed frame structure, making the pressure rollers 520 less prone to bending and deformation. The central rod 541 not only provides a location for the cylinder installation, but also improves the overall mechanical strength of the central rod 541, the first end plate 542, the second end plate 543, and all the pressure rollers 520, further preventing the pressure rollers 520 from twisting. All the pressure rollers 520 are evenly distributed circumferentially around the central axis of the central rod 541.

[0052] See Figure 5 , Figure 6 and Figure 7 In some embodiments of the present invention, the first end plate 542 and / or the second end plate 543 are provided with an adjustment groove 550, and the end of the pressure roller 520 is provided with an adjustment block 525 movably disposed within the adjustment groove 550. The width and height dimensions of the adjustment groove 550 are both greater than the width and height dimensions of the adjustment block 525. The first end plate 542 or the second end plate 543 is provided with a displacement adjustment assembly for adjusting the relative position of the adjustment block 525 within the adjustment groove 550. It should be noted that when the pressure roller 520 presses the battery electrode against the outer peripheral wall of the unloaded take-up drum 300, if the axial direction of the pressure roller 520 is not parallel to the axial direction of the take-up drum 300, the battery electrode cannot form line contact with the pre-set double-sided adhesive tape 310 on the take-up drum 300, thus making it impossible to smoothly paste the cut end of the battery electrode onto the take-up drum 300. At this time, the relative positions of the two ends of the pressure roller 520 in the height and width directions of the adjustment groove 550 can be adjusted by using the displacement adjustment component, so that the axial direction of the pressure roller 520 can be adjusted to be parallel to the axial direction of the winding cylinder 300.

[0053] See Figure 7In some embodiments of the present invention, the displacement adjustment assembly includes a first fastening screw 810 passing through the height direction of the adjustment block 525, a first threaded push rod 820 threadedly connected along the height direction of the adjustment block 525, a second fastening screw 830 passing through the width direction of the adjustment block 525, and a second threaded push rod 840 threadedly connected along the width direction of the adjustment block 525. The bottom of the adjustment groove 550 is provided with a first threaded hole that mates with the first fastening screw 810, and the side wall of the adjustment groove 550 is provided with a second threaded hole that mates with the second fastening screw 830. When the first threaded push rod 820 and the second threaded push rod 840 rotate, they abut against the wall surface of the adjustment groove 550, driving the adjustment block 525 to move along the height and depth directions of the adjustment groove 550.

[0054] Understandably, when it is necessary to adjust the position of both ends of the pressure roller 520 so that the battery electrode on the pressure roller 520 forms line contact with the outer peripheral wall of the winding cylinder 300, the first fastening screw 810 and the second fastening screw 830 are loosened, allowing the adjusting block 525 to move in the height and width directions of the adjusting groove 550. Then, the first threaded push rod 820 and the second threaded push rod 840 are rotated respectively, and the adjusting block 525 can adjust its displacement in the height and width directions of the adjusting groove 550. After adjustment, the first fastening screw 810 and the second fastening screw 830 are tightened. It should be noted that the first threaded push rod 820 and the second threaded push rod 840 can only rotate relative to the adjusting groove 550. The adjusting block 525 cannot rotate around the first threaded push rod 820 or the second threaded push rod 840 under the limiting action of the adjusting groove 550, which is equivalent to forming two sets of screw mechanisms to achieve the feeding motion.

[0055] See Figure 4 In some embodiments of the present invention, a strip-shaped protective plate 533 is installed in the area between the two pressure rollers 520 opposite to the blade 532. The strip-shaped protective plate 533 has a through-hole groove 534 that matches the thickness of the blade 532. It is understood that when a worker accidentally inserts their hand or fingers into the receiving space between the two pressure rollers 520 opposite to the blade 532, the blade 532 can easily cut the hand or fingers, causing a safety accident. The strip-shaped protective plate 533 can solve this problem. When cutting battery electrodes, the blade 532 can pass through the through-hole groove 534 without affecting the normal cutting work.

[0056] In some embodiments of the present invention, a tail adhesive bonding mechanism is also included. After the cutting mechanism 530 cuts the battery electrode sheet, the first winding mechanism 100 or the second winding mechanism 200 drives the tail of the battery electrode sheet to be wound onto the fully wound winding drum 300. The tail adhesive bonding mechanism then bonds and fixes the tail of the battery electrode sheet onto the winding drum 300. It should be noted that even after the cutting mechanism 530 cuts the battery electrode sheet from the fully wound winding drum 300, and even after the winding drum 300 has finished winding the tail of the battery electrode sheet, the tail of the battery electrode sheet may still be released, bent, etc., during production and transportation. Using the tail adhesive bonding mechanism to bond and fix the tail of the battery electrode sheet onto the winding drum 300 can completely solve this problem, thereby achieving truly fully automated roll changing.

[0057] See Figures 1 to 3 The present invention also discloses a roll-changing control method, and a battery electrode rewinding and changing system applying any of the above technical solutions includes the following steps: Step S1: When the winding drum 300 of one of the first winding mechanism 100 and the second winding mechanism 200 reaches or is close to full winding, the empty winding drum 300 of the other one rotates until the double-sided tape 310 is at a set angle position, and the tape splicing device 500 is ready to work. In step S2, before or during the operation of the tape-connecting device 500, the tension holding mechanism 600 drives the battery electrode located behind the roller assembly 400 to maintain a preset tension. When the tape-connecting device 500 is working, the moving mechanism 510 drives the pressure roller 520 to press the battery electrode on it against the double-sided tape 310 of the unloaded take-up drum 300. At this time, one side of the double-sided tape 310 is located on the contact line between the pressure roller 520 and the unloaded take-up drum 300. Then, the cutting mechanism 530 cuts the battery electrode located between the pressure roller 520 and the fully wound take-up drum 300. The part from the end of the cut battery electrode to the contact line between the pressure roller 520 and the unloaded take-up drum 300 constitutes the bonding section 10. In step S3, the first winding mechanism 100 or the second winding mechanism 200 drives the unloaded winding drum 300 to rotate so that the double-sided tape 310 is completely pasted on the section to be bonded 10. During this process, the tension holding mechanism 600 continues to work. Then, the unloaded winding drum 300 rotates in the opposite direction to tension the battery electrode. When the tension detection mechanism detects that the tension data of the battery electrode between the unloaded winding drum 300 and the roller assembly 400 reaches the set value, the tension holding mechanism 600 stops working until the unloaded winding drum 300 winds the battery electrode to a full roll.

[0058] The above roll-changing control method, based on the automatic tape splicing and roll changing when the winding drum 300 reaches full roll, ensures that the battery electrode sheet can only be wound up after the tension of the spliced ​​tape reaches the transmission requirements. This ensures that the battery electrode sheet will not shrink back to avoid affecting the processing accuracy of the previous process and to prevent some of the battery electrode sheets from being defective due to roll changing in continuous production.

[0059] See Figure 1 In some embodiments of the present invention, the roller assembly 400 includes a common roller 410, a first roller 420 located between the common roller 410 and the first winding mechanism 100, and a second roller 430 located between the common roller 410 and the second winding mechanism 200. The tension holding mechanism 600 includes a pressing assembly. In step S2, before the tape receiving device 500 operates, the pressing assembly presses and fixes the battery electrode sheets onto the outer peripheral wall of the common roller 410. The fully loaded winding drum 300 stops rotating, and the battery electrode sheets located behind the common roller 410 stop being transported and are held in place. Maintaining a preset tension, as the moving mechanism 510 drives the pressure roller 520 to press the battery electrode against the double-sided tape 310 of the unloaded take-up drum 300, the fully loaded take-up drum 300 rotates to release some of the battery electrode, allowing the battery electrode to remain taut against the double-sided tape 310. When the tension detection mechanism detects that the tension data of the battery electrode between the unloaded take-up drum 300 and the roller assembly 400 reaches the set value, the pressing assembly separates from the battery electrode, and then the unloaded take-up drum 300 winds the battery electrode until it is fully wound. This roll-changing control method eliminates the need for a tension holding mechanism 600 to dynamically adjust and stabilize the tension data of the battery electrode, making tape splicing and roll changing easier and more convenient to operate.

[0060] See Figure 2In some embodiments of the present invention, the roller assembly 400 includes a plurality of transfer rollers 440, and the tension holding mechanism 600 includes a buffer assembly disposed between two of the transfer rollers 440; when the winding drum 300 of one of the first winding mechanism 100 and the second winding mechanism 200 is close to a full roll, the empty winding drum 300 of the other rotates until the double-sided tape 310 is at a set angle position, and the nearly full roll winding drum 300 continues to rotate. Before the tape splicing device 500 operates, the transmission speed of the battery electrode behind the roller assembly 400 and the linear speed of the winding drum 300 winding the battery electrode are both V1. The moving mechanism 510 drives the pressure roller 520 to press the battery electrode against the empty roll. During the process of winding the double-sided adhesive tape 310 onto the take-up reel 300, the linear speed of the take-up reel 300 winding the battery electrode sheet decreases from V1 to V2 to compensate for the displacement caused by the moving mechanism 510 moving the battery electrode sheet, while maintaining the tension data of the battery electrode sheet unchanged. During the rotation of the unloaded take-up reel 300 to ensure that all the double-sided adhesive tape 310 is adhered to the bonding section 10, the battery electrode sheet tends to loosen as it shifts backward. The buffer assembly works synchronously to buffer a portion of the battery electrode sheet between the two transfer rollers 440. The buffer assembly operates based on data feedback from the tension detection mechanism to maintain the battery electrode sheet at the set tension data. Then, the unloaded take-up reel 300 rotates in the reverse direction to wind the battery electrode sheet. This roll-changing control method allows for the connection and roll-changing of battery electrode sheets without stopping the production line or the take-up reel 300 when it is nearly full. While ensuring the processing accuracy of the preceding processes, continuous production is possible, thereby improving production efficiency.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery electrode winding and changing system, characterized in that, include: A first winding mechanism and a second winding mechanism are arranged at intervals. Both the first winding mechanism and the second winding mechanism are detachably equipped with winding drums. The surface of the winding drums is pre-loaded with double-sided adhesive tape. A roller assembly guides the processed battery electrodes onto the take-up drum; The tape receiving device includes a moving mechanism, a pressure roller, and a cutting mechanism. The moving mechanism drives the pressure roller to press the battery electrode sheet on it against the double-sided tape of an empty take-up drum. The cutting mechanism is used to cut the battery electrode sheet located between the pressure roller and the fully wound take-up drum. A tension holding mechanism is used to drive the battery electrode located behind the roller assembly to maintain a preset tension. The tension detection mechanism is used to detect the tension data of the battery electrode between the unloaded winding drum and the roller assembly. It is electrically connected to the first winding mechanism and the second winding mechanism and can control the unloaded winding drum to rotate until the tension data of the battery electrode reaches the set value. The first winding mechanism and the second winding mechanism are respectively equipped with a first motor and a second motor for driving the corresponding winding drum to rotate. The sides of the first winding mechanism and the second winding mechanism are equipped with a first sensor for detecting the angle position of the double-sided tape and a second sensor for detecting the outer diameter of the battery electrode on the winding drum. The position where the pressure roller contacts the unloaded winding drum is the tape-joining station. The part from one end of the cut battery electrode to the tape-joining station is the section to be bonded. The first motor or the second motor rotates in a first clockwise direction to bond the double-sided tape to the section to be bonded. The first motor or the second motor rotates in a second clockwise direction until the tension data of the battery electrode between the unloaded winding drum and the roller assembly reaches a set value.

2. The battery electrode rewinding and changing system according to claim 1, characterized in that: The width of the double-sided tape is equal to the width of the section to be bonded.

3. The battery electrode rewinding and changing system according to claim 1, characterized in that: The roller assembly includes a common roller, a first roller located between the common roller and the first winding mechanism, and a second roller located between the common roller and the second winding mechanism. The tension holding mechanism includes a pressing assembly that presses and fixes the battery electrode sheet to the outer peripheral wall of the common roller. During the process in which the moving mechanism drives the pressure roller to press the battery electrode sheet against the double-sided tape, the first motor or the second motor rotates to release a portion of the battery electrode sheet from the fully wound winding cylinder so that the battery electrode sheet is taut against the double-sided tape.

4. The battery electrode winding and changing system according to claim 1, characterized in that: The roller assembly includes multiple transfer rollers, and the tension holding mechanism includes a buffer assembly disposed between two of the transfer rollers. During the bonding process of the double-sided tape and the section to be bonded, the buffer assembly is able to store the continuously forward-feeding battery electrode located behind the roller assembly.

5. The battery electrode rewinding and changing system according to claim 1, characterized in that: The tension detection mechanism includes a torque detection unit and a calculation module connected to the torque detection unit. The torque detection unit can detect the torque value applied to the winding drum by the first motor or the second motor. The calculation module calculates the tension data of the battery electrode based on the torque value and the diameter of the unloaded winding drum. Alternatively, the tension detection mechanism may include two tension detection rollers respectively located between the roller assembly and the first winding mechanism, and between the roller assembly and the second winding mechanism. Four sets of strain gauges are evenly arranged circumferentially inside the tension detection rollers to form a full-bridge circuit. The full-bridge circuit is connected to a signal processing module. When the battery electrode passes through the tension detection rollers, the strain gauges generate strain. The signal processing module converts and outputs the tension data of the battery electrode.

6. The battery electrode rewinding and changing system according to claim 1, characterized in that: After the battery electrode sheet is pressed against the double-sided tape, the cutting mechanism cuts the battery electrode sheet, and the empty winding drum begins to wind the battery electrode sheet, the moving mechanism drives the pressure roller to remain pressed against the battery electrode sheet for a certain period of time to prevent the battery electrode sheet and the double-sided tape from separating.

7. The battery electrode rewinding and changing system according to claim 1, characterized in that: The first winding mechanism and the second winding mechanism are distributed left and right. The moving mechanism includes an X-axis linear module arranged along the left and right direction and a Y-axis linear module located at the output end of the X-axis linear module. The Y-axis linear module is equipped with a rotary motor and a swing arm connected to the output end of the rotary motor. The pressure roller is rotatably located on the swing arm, and the cutter mechanism is movably located on the swing arm.

8. A battery electrode rewinding and changing system according to claim 7, characterized in that: The winding cylinder is arranged axially along the front-to-back direction. The swing arm is provided with a mounting frame arranged along the front-to-back direction. A plurality of pressure rollers are distributed circumferentially around an axis extending in the front-to-back direction on the mounting frame. All the pressure rollers form an accommodating space. The cutting mechanism includes a telescopic driver and a blade connected to the output end of the telescopic driver. The telescopic driver drives the blade to extend or retract into the accommodating space along the area between two of the pressure rollers.

9. A battery electrode winding and changing system according to claim 8, characterized in that: The mounting frame includes a central rod extending in a front-rear direction and a first end plate and a second end plate disposed at both ends of the central rod. The length direction of the blade is parallel to the central rod. The telescopic actuator includes two cylinders fixedly mounted on the central rod and connected to both ends of the blade. The two ends of the pressure roller are respectively connected to the outer peripheral edge of the first end plate and the outer peripheral edge of the second end plate, so that all the pressure rollers surround the outer periphery of the central rod.

10. A battery electrode winding and changing system according to claim 9, characterized in that: The first end plate and / or the second end plate are provided with an adjustment groove, and the end of the pressure roller is provided with an adjustment block that is movably disposed within the adjustment groove. The width and height of the adjustment groove are both greater than the width and height of the adjustment block. The first end plate or the second end plate is provided with a displacement adjustment component for adjusting the relative position of the adjustment block within the adjustment groove.

11. A battery electrode winding and changing system according to claim 10, characterized in that: The displacement adjustment assembly includes a first fastening screw passing through the height direction of the adjustment block, a first threaded push rod threadedly connected along the height direction of the adjustment block, a second fastening screw passing through the width direction of the adjustment block, and a second threaded push rod threadedly connected along the width direction of the adjustment block. The bottom of the adjustment groove is provided with a first threaded hole that mates with the first fastening screw, and the side wall of the adjustment groove is provided with a second threaded hole that mates with the second fastening screw. When the first threaded push rod and the second threaded push rod rotate, they abut against the wall of the adjustment groove, driving the adjustment block to move along the height and depth directions of the adjustment groove.

12. A battery electrode winding and changing system according to claim 9, characterized in that: A strip-shaped protective plate is installed in the area between the two pressure rollers directly opposite the blade edge. The strip-shaped protective plate has through-hole grooves that match the thickness of the blade.

13. A battery electrode winding and changing system according to claim 1, characterized in that: It also includes a tail adhesive bonding mechanism. After the cutting mechanism cuts the battery electrode sheet, the first winding mechanism or the second winding mechanism drives the tail material of the battery electrode sheet to be wound onto a fully wound winding drum. The tail adhesive bonding mechanism then attaches and fixes the tail of the battery electrode sheet to the winding drum.

14. A roll-changing control method, employing a battery electrode rewinding and changing system according to any one of claims 1-13, characterized in that, Includes the following steps: Step S1: When the winding drum of one of the first winding mechanism and the second winding mechanism reaches or is close to full, the empty winding drum of the other mechanism rotates until the double-sided tape is at the set angle position, and the tape splicing device is ready to work. Step S2: Before or during the operation of the tape splicing device, the tension holding mechanism drives the battery electrode located behind the roller assembly to maintain a preset tension. When the tape splicing device is working, the moving mechanism drives the pressure roller to press the battery electrode on it against the double-sided tape of the empty take-up drum. At this time, one side of the double-sided tape is located on the contact line between the pressure roller and the empty take-up drum. Then, the cutting mechanism cuts off the battery electrode located between the pressure roller and the fully wound take-up drum. The part from the end of the cut battery electrode to the contact line between the pressure roller and the empty take-up drum constitutes the section to be bonded. In step S3, the first or second winding mechanism drives the unloaded winding drum to rotate so that all the double-sided tape is pasted on the section to be bonded. During this process, the tension holding mechanism continues to work. Then, the unloaded winding drum rotates in the opposite direction to tension the battery electrode. When the tension detection mechanism detects that the tension data of the battery electrode between the unloaded winding drum and the roller assembly reaches the set value, the tension holding mechanism stops working until the unloaded winding drum winds the battery electrode to a full roll.

15. The roll-changing control method according to claim 14, characterized in that: The roller assembly includes a common roller, a first roller located between the common roller and the first winding mechanism, and a second roller located between the common roller and the second winding mechanism. The tension holding mechanism includes a pressing assembly. In step S2, before the tape splicing device operates, the pressing assembly presses and fixes the battery electrode sheet to the outer peripheral wall of the common roller. The fully loaded winding drum stops rotating, and the battery electrode sheet located behind the common roller stops being transmitted and maintains a preset tension. During the process of the moving mechanism driving the pressure roller to press the battery electrode sheet against the double-sided tape of the empty winding drum, the fully loaded winding drum rotates to release part of the battery electrode sheet so that the battery electrode sheet can remain taut against the double-sided tape. When the tension detection mechanism detects that the tension data of the battery electrode sheet between the empty winding drum and the roller assembly reaches the set value, the pressing assembly separates from the battery electrode sheet, and then the empty winding drum winds the battery electrode sheet until it is fully wound.

16. The roll-changing control method according to claim 14, characterized in that: The roller conveyor assembly includes multiple conveyor rollers, and the tension holding mechanism includes a buffer assembly disposed between two of the conveyor rollers. When the winding drum of one of the first winding mechanism and the second winding mechanism is close to full winding, the empty winding drum of the other mechanism rotates until the double-sided tape is at a set angle position. The winding drum that is close to full winding continues to rotate. Before the tape splicing device operates, the conveying speed of the battery electrode sheet behind the roller conveyor assembly and the linear speed of the winding drum winding the battery electrode sheet are both V1. The moving mechanism drives the pressure roller to press the battery electrode sheet against the double-sided tape of the empty winding drum. During the process, the linear speed of the winding drum winding the battery electrode sheet is reduced from V1 to V2 to compensate for the displacement caused by the moving mechanism driving the battery electrode sheet, while maintaining the tension data of the battery electrode sheet unchanged. As the unloaded winding drum rotates to ensure that all the double-sided tape is adhered to the section to be bonded, the battery electrode sheet tends to become loose due to the backward displacement. The buffer component works synchronously to buffer part of the battery electrode sheet between the two transfer rollers. The buffer component works according to the data fed back by the tension detection mechanism to keep the battery electrode sheet always at the set tension data. Then, the unloaded winding drum rotates in the opposite direction to wind the battery electrode sheet.

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