Lithium battery winding mechanism

Abstract

The utility model discloses a kind of lithium battery winding mechanisms. The winding mechanism includes winding needle, clamping and feeding glue component, first compression roller, cutting knife and optical sensor. The termination adhesive tape is spaced apart along the length direction and is provided with a plurality of identifiable marks, and the mark spacing is adapted to the termination adhesive tape length of the battery cell. The optical sensor is arranged on the termination adhesive tape conveying path, and the detection surface of the optical sensor is opposite the identifiable mark on the adhesive tape surface. When the optical sensor detects the preset number of identifiable marks, the cutting knife cuts off the termination adhesive tape, and the termination adhesive tape of the battery cell is attached by the cooperation of the winding needle and the first compression roller. Through the detection control of the optical sensor on the identifiable mark, the accurate control of the termination adhesive tape attachment length is realized, and the quality stability and production efficiency of lithium battery production are improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production, and in particular to a lithium battery winding mechanism. Background Technology

[0002] In the production of cylindrical lithium batteries, after the cells are wound, terminating tape needs to be applied to secure the cell structure. Traditional terminating tape application typically involves pre-cutting the tape to a predetermined length before application. This method requires additional tape pre-treatment and storage space, resulting in a complex production line structure. The storage and conveying mechanisms for the pre-cut tape occupy significant equipment space, increasing equipment costs and maintenance difficulty. Furthermore, the pre-cut tape is prone to adhesion and deformation during storage and conveying, affecting application quality. The fixed-length pre-cut method also struggles to accommodate the varying tape length requirements of different cell sizes, resulting in insufficient production flexibility. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a lithium battery winding mechanism with continuous glue supply and precise cutting.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A lithium battery winding mechanism includes: a winding needle for winding a battery cell; a clamping adhesive assembly for feeding the first end of a terminating adhesive tape into the battery cell; a first pressure roller movably disposed near the battery cell for pressing the terminating adhesive tape onto the battery cell after the clamping adhesive assembly feeds the first end of the terminating adhesive tape into the battery cell; a cutter for cutting the terminating adhesive tape during the tape application process; and an optical sensor disposed on the terminating adhesive tape conveying path. The terminating adhesive tape has multiple identifiable marks spaced along its length, and the mark spacing is adapted to the terminating adhesive application length of the battery cell. The detection surface of the optical sensor faces the identifiable marks on the tape surface. When the optical sensor detects a preset number of identifiable marks, the cutter cuts the terminating adhesive tape, and the winding needle and the first pressure roller cooperate to complete the application of the terminating adhesive to the battery cell.

[0006] Furthermore, it also includes an encoder, which is located downstream of the optical sensor and is used to detect the amount of movement of the termination tape after passing through the optical sensor. The encoder works with the optical sensor to calculate the adhesive length on the roller needle. When the adhesive length reaches a preset cutting position, the cutter cuts the termination tape.

[0007] Furthermore, the optical sensor is located at the initial input end of the termination tape; a fixing component is provided between the encoder and the tape feeding assembly, the fixing component being used to fix the termination tape during transmission; when it is necessary to cut the termination tape, the fixing component fixes one end of the termination tape, the first pressure roller cooperates with the battery cell to press the other end of the termination tape, so that the termination tape forms a tensioned state at the cutting position, and then is cut by the cutter.

[0008] Furthermore, the fixing assembly includes a guide roller and a clamping member. The guide roller is used to guide the delivery of the termination tape, and the clamping member is movably disposed on one side of the guide roller to clamp and fix or release the termination tape by moving closer to or away from the guide roller.

[0009] Furthermore, the tape feeding assembly includes two opposing clamping rollers and clamping jaws. The clamping jaws are used to clamp the beginning of the terminating tape and feed it into the battery cell. The clamping rollers are used to clamp one end of the terminating tape during cutting, and cooperate with the first pressure roller to press the other end of the terminating tape, so that the terminating tape is in a tensioned state at the cutting position.

[0010] Furthermore, the first pressure roller is located at the initial attachment position of the termination tape and the battery cell, and at least one second pressure roller is also provided along the circumference of the battery cell. The second pressure roller is used to compact the attached termination tape to ensure the tightness of the adhesion between the termination tape and the battery cell.

[0011] Furthermore, the identifiable mark has optical contrast with the tape substrate, including at least one of color difference, reflectivity difference, transmittance difference, or surface texture difference, to facilitate detection and identification by the optical sensor.

[0012] Furthermore, the identifiable mark has a color difference from the tape substrate, and the optical sensor is a through-beam fiber optic sensor.

[0013] Furthermore, the termination tape is provided with information codes at intervals, with each information code located between two adjacent identifiable marks.

[0014] Furthermore, the information code is a QR code.

[0015] The beneficial effects of this utility model are:

[0016] A lithium battery winding mechanism includes a winding needle, a glue-feeding assembly, a first pressure roller, a cutter, and an optical sensor. The winding needle winds the battery cell, the glue-feeding assembly feeds the beginning of the terminating adhesive tape into the cell, the first pressure roller is movably positioned near the cell to press the terminating adhesive tape onto the cell after the glue-feeding assembly feeds the beginning of the tape, and the cutter cuts the terminating adhesive tape during the tape application process. Multiple identifiable marks are spaced along the length of the tape, with the mark spacing adapted to the terminating adhesive application length of the battery cell. The optical sensor is positioned on the terminating adhesive tape conveying path, with its detection surface facing the identifiable marks on the tape surface. When the optical sensor detects a preset number of identifiable marks, the cutter cuts the terminating adhesive tape, and the winding needle and the first pressure roller work together to complete the application of the terminating adhesive to the battery cell. By controlling the detection of the identifiable marks through the optical sensor, precise control of the terminating adhesive tape application length is achieved, improving the quality stability and production efficiency of lithium battery production. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the terminating adhesive of this utility model.

[0020] in,

[0021] 1. Needle winding; 11. Battery cell; 2. First pressure roller; 3. Second pressure roller;

[0022] 4. Glue feeding assembly; 41. Clamping roller; 42. Gripper;

[0023] 5. Termination adhesive; 51. Identifiable marking; 52. Information code;

[0024] 6. Cutter; 7. Optical sensor; 8. Encoder;

[0025] 9. Fixing component; 91. Roller; 92. Pressing component. Detailed Implementation

[0026] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0027] Reference Figure 1 , Figure 2 This utility model discloses a lithium battery winding mechanism. The mechanism controls the attachment length of the battery cell 11 by pre-setting an identifiable mark 51 on the terminating adhesive 5 and cooperating with an optical sensor 7 for real-time detection.

[0028] A lithium battery winding mechanism includes: a winding needle 1 for winding a battery cell 11; a clamping adhesive assembly 4 for feeding the first end of a terminating adhesive strip 5 into the battery cell 11; a first pressure roller 2 movably disposed near the battery cell 11 for pressing the terminating adhesive strip 5 onto the battery cell 11 after the clamping adhesive assembly 4 feeds the first end of the terminating adhesive strip 5 into the battery cell 11; a cutter 6 for cutting the terminating adhesive strip 5 during the adhesive tape application process; and an optical sensor 7 disposed on the conveying path of the terminating adhesive strip 5. The terminating adhesive strip 5 has multiple identifiable marks 51 spaced apart along its length, and the mark spacing is adapted to the terminating adhesive strip 5 application length of the battery cell 11. The detection surface of the optical sensor 7 faces the identifiable marks 51 on the adhesive strip surface. When the optical sensor 7 detects a preset number of identifiable marks 51, the cutter 6 cuts the terminating adhesive strip 5, and the winding needle 1 and the first pressure roller 2 cooperate to complete the application of the terminating adhesive strip 5 onto the battery cell 11.

[0029] Understandably, the working principle is to convert length measurement into mark counting. Specifically, during the production process of the terminating adhesive tape 5, multiple identifiable marks 51 are set along its length at predetermined intervals. The spacing of the marks is adapted to the required attachment length of the terminating adhesive tape 5 for the battery cell 11. For example, when the battery cell 11 needs to be attached with a 50mm length of terminating adhesive tape 5, a mark can be set every 10mm on the tape. In this way, the attachment length of 50mm can be determined by detecting 5 marks. The pre-marking method establishes a position reference, avoiding the cumulative errors caused by factors such as slippage and wear that may occur in the traditional length measurement method of the encoder 8.

[0030] In some embodiments, refer to Figure 1It also includes an encoder 8, which is located downstream of the optical sensor 7 and is used to detect the amount of movement of the terminating adhesive 5 tape after passing through the optical sensor 7. The encoder 8 works with the optical sensor 7 to calculate the adhesive application length on the winding needle 1. When the adhesive application length reaches the preset cutting position, the cutter 6 cuts the terminating adhesive 5 tape.

[0031] Understandably, encoder 8 is used to detect the precise movement of the tape 5 after passing optical sensor 7, forming a dual detection mechanism with optical sensor 7 to jointly calculate the actual adhesive length on the winding needle 1. Specifically, optical sensor 7 performs coarse positioning, while encoder 8 performs precise measurement. When optical sensor 7 detects the identifiable mark 51, it records the reference position, and then encoder 8 begins to precisely measure the movement distance of the tape. Since encoder 8 is located downstream of optical sensor 7, it can accurately measure the length of tape that has passed the detection point of optical sensor 7, which is the effective length that has been or will be applied to the battery cell 11. By using the mark position detected by optical sensor 7 as the reference point, combined with the movement measured by encoder 8, the accurate adhesive length on winding needle 1 can be calculated in real time.

[0032] While the identifiable marker 51 provides a positional reference, the marker spacing is typically set relatively large, such as 5mm or 10mm, for ease of processing and inspection. If relying solely on marker counting, cutting accuracy is limited by the marker spacing. However, by adding an encoder 8 for measurement, the amount of tape movement can be measured even after the optical sensor 7 detects a marker, thus achieving control over cutting accuracy.

[0033] The encoder 8 is typically a rotary encoder, which is coaxially connected to the guide roller or pressure roller in the conveyor belt path to convert the linear movement of the conveyor belt into a rotation angle signal. When the conveyor belt moves, the encoder 8 outputs a corresponding pulse signal; the movement distance can be obtained by calculating the number of pulses. This measurement method can achieve a resolution of 0.1 mm, significantly improving detection accuracy.

[0034] In some embodiments, when the optical sensor 7 detects a preset number of identifiable marks 51, it does not immediately perform a cutting action, but continues to monitor the output signal of the encoder 8. Based on the preset cutting position parameters and the amount of movement measured by the encoder 8, the accurate cutting timing is calculated. The cutter 6 only performs the cutting action when the adhesive length reaches the preset cutting position.

[0035] During the actual application process, the adhesive feeding assembly 4 first feeds the beginning of the terminating adhesive tape 5 onto the surface of the wound battery cell 11. Once the beginning of the tape is in place, the first pressure roller 2 moves to the vicinity of the battery cell 11 to initially press the tape, ensuring reliable contact between the tape and the surface of the battery cell 11. As the winding needle 1 continues to rotate, the battery cell 11 continues to wind, and the tape gradually adheres to the outer surface of the battery cell 11.

[0036] In some embodiments, refer to Figure 1 The optical sensor 7 is located at the initial input end of the termination adhesive tape 5; a fixing component 9 is provided between the encoder 8 and the clamping adhesive assembly 4, the fixing component 9 is used to fix the termination adhesive tape 5 during transmission; when it is necessary to cut the termination adhesive tape 5, the fixing component 9 fixes one end of the termination adhesive tape 5, the first pressure roller 2 and the battery cell 11 cooperate to press the other end of the termination adhesive tape 5, so that the termination adhesive tape 5 forms a tensioned state at the cutting position, and then is cut by the cutter 6.

[0037] Understandably, to further optimize the control precision and cutting quality of the tape conveying path, the optical sensor 7 is positioned at the initial input end of the terminating tape 5. This allows the optical sensor 7 to detect the identifiable mark 51 before the tape enters the winding area, providing a reference signal for subsequent length calculations.

[0038] The main function of the fixing component 9 is to provide a controllable fixing point during the tape conveying process, ensuring that the tape maintains a stable tension state during cutting. During normal tape conveying, the fixing component 9 remains in the released state, allowing the tape to pass freely. When a cutting operation is required, the fixing component 9 clamps one end of the tape, while the first pressure roller 2, in conjunction with the winding battery cell 11, presses the other end of the tape. By fixing the tape at both ends, a suitable tension state is formed at the predetermined cutting position, providing ideal cutting conditions for the cutter 6.

[0039] Furthermore, the fixing component 9 includes a guide roller 91 and a clamping member 92. The guide roller 91 guides the conveying of the terminating adhesive tape 5, and the clamping member 92 is movably disposed on one side of the guide roller 91, clamping and fixing or releasing the terminating adhesive tape 5 by moving closer to or away from the guide roller 91. Under normal conveying conditions, the clamping member 92 is away from the guide roller 91, and the tape only contacts the surface of the guide roller 91 and is smoothly conveyed under its guidance without generating additional conveying resistance. When a cutting operation is required, the clamping member 92 quickly moves closer to the guide roller 91, firmly clamping the tape between the guide roller 91 and the clamping member 92, forming a reliable fixing point. The moving mechanism of the clamping member 92 can be in the form of a cylinder, a motor-driven cam mechanism, or an electromagnetic actuator, ensuring rapid response and reliability of the clamping action.

[0040] In some embodiments, the tape feeding assembly includes two opposing clamping rollers 41 and clamping claws 42. The clamping claws 42 are used to clamp the beginning of the terminating tape 5 and feed it into the battery cell 11. The clamping rollers 41 are used to clamp one end of the terminating tape 5 during cutting and cooperate with the first pressure roller 2 to press the other end of the terminating tape 5, so that the terminating tape 5 is in a tensioned state at the cutting position.

[0041] The two tensioning schemes described above can be configured simultaneously in the same device to form multiple tension control. In this case, the fixing component 9 provides primary tension control to ensure the basic stability of the tape in the conveying path, while the clamping roller 41 of the tape feeding component 4 provides further tension adjustment to optimize the tape condition at the time of cutting.

[0042] In some embodiments, refer to Figure 1 The first pressure roller 2 is located at the initial attachment position of the terminating adhesive tape 5 and the battery cell 11. At least one second pressure roller 3 is also provided along the circumference of the battery cell 11. The second pressure roller 3 is used to compact the attached terminating adhesive tape 5, ensuring a tight bond between the terminating adhesive tape 5 and the battery cell 11. It can be understood that multi-stage pressure rollers are used to ensure the overall bonding quality between the terminating adhesive tape 5 and the battery cell 11. The first pressure roller 2, at the initial attachment position of the terminating adhesive tape 5 and the battery cell 11, plays the role of fixing the starting end of the tape and initial pressing. Based on this, at least one second pressure roller 3 is also provided along the circumference of the battery cell 11, forming a segmented compaction mechanism. When the battery cell 11 rotates during winding, the tape that has been initially attached by the first pressure roller 2 will sequentially pass through subsequent second pressure rollers 3. Each second pressure roller 3 further compacts the tape within its coverage area, eliminating any possible air bubbles and wrinkles, ensuring a tight bond between the tape and the surface of the battery cell 11.

[0043] Due to the dynamic characteristics of the battery cell 11 during the winding process and the flexibility of the adhesive tape itself, relying solely on the initial pressing of the first pressure roller 2 is often insufficient to guarantee consistent bonding quality across the entire length of the adhesive tape. By arranging multiple second pressure rollers 3 circumferentially around the battery cell 11, a progressive compaction process can be achieved on the adhesive tape. Each pressure roller applies appropriate pressure to the adhesive tape at a specific angle, thereby achieving a comprehensive and tight bond between the adhesive tape and the surface of the battery cell 11, effectively improving the reliability and consistency of the bonding process.

[0044] In some embodiments, the identifiable mark 51 has optical contrast with the tape substrate, including at least one of color difference, reflectivity difference, transmittance difference, or surface texture difference, to facilitate detection and identification by the optical sensor 7. The optical sensor 7 can identify the mark position during continuous tape conveying, providing a reference signal for subsequent length calculation.

[0045] Furthermore, the identifiable mark 51 has a color difference from the tape substrate, and the optical sensor 7 is a through-beam fiber optic sensor.

[0046] Specifically, through-beam fiber optic sensors, by separating the transmitter and receiver, can accurately detect changes in the optical properties of objects passing between them. When markers of different colors pass through the sensor's detection area, the light intensity received by the sensor will change significantly due to the different light absorption or reflection characteristics caused by the color differences, thus generating a detection signal.

[0047] In some embodiments, refer to Figure 2 The termination adhesive tape 5 has information codes 52 spaced apart, with each information code 52 located between two adjacent identifiable marks 51. The information codes 52 facilitate the recording of cell 11 data, saving on subsequent coding equipment.

[0048] Information code 52 can be a barcode, QR code, or other machine-readable encoding format, capable of carrying important data such as tape batch information, production date, specifications, and quality grade. By simultaneously reading these information codes 52 during the tape application process, the production equipment can achieve a complete record of the tape information used for each battery cell 11, providing detailed data support for subsequent product traceability and quality control.

[0049] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A lithium battery winding mechanism, characterized in that, include: roll Needles are used for winding battery cells; The adhesive feeding assembly is used to feed the first end of the terminating tape into the battery cell. A first pressure roller is movably disposed near the battery cell and is used to press the terminating tape onto the battery cell after the clamping adhesive assembly feeds the first end of the terminating tape into the battery cell. A cutter is used to cut the stop tape during the application of the stop tape. An optical sensor is disposed on the delivery path of the termination tape; The termination tape has multiple identifiable marks spaced along its length, and the spacing between the marks is adapted to the length of the termination tape attached to the battery cell. The detection surface of the optical sensor faces the identifiable marks on the tape surface. When the optical sensor detects a preset number of identifiable marks, the cutter cuts the termination tape, and the winding needle and the first pressure roller work together to complete the application of the cell termination adhesive.

2. The lithium battery winding mechanism according to claim 1, characterized in that, It also includes an encoder, which is located downstream of the optical sensor and is used to detect the amount of movement of the terminating tape after passing through the optical sensor. The encoder works with the optical sensor to calculate the adhesive length on the roller needle. When the adhesive length reaches a preset cutting position, the cutter cuts the terminating tape.

3. The lithium battery winding mechanism according to claim 2, characterized in that, The optical sensor is located at the initial input end of the terminating tape; A fixing component is provided between the encoder and the adhesive feeding assembly, and the fixing component is used to fix the termination tape during transmission. When it is necessary to cut the termination tape, the fixing component fixes one end of the termination tape, and the first pressure roller cooperates with the battery cell to press the other end of the termination tape, so that the termination tape is in a tensioned state at the cutting position, and then it is cut by the cutter.

4. The lithium battery winding mechanism according to claim 3, characterized in that, The fixing assembly includes a guide roller and a clamping member. The guide roller is used to guide the delivery of the termination tape, and the clamping member is movably disposed on one side of the guide roller to clamp and fix or release the termination tape by moving closer to or away from the guide roller.

5. The lithium battery winding mechanism according to claim 1, characterized in that, The adhesive feeding assembly includes two opposing clamping rollers and clamping jaws. The clamping jaws are used to clamp the beginning of the terminating tape and feed it into the battery cell. The clamping rollers are used to clamp one end of the terminating tape during cutting, and cooperate with the first pressure roller to press the other end of the terminating tape, so that the terminating tape is in a tensioned state at the cutting position.

6. The lithium battery winding mechanism according to claim 1, characterized in that, The first pressure roller is located at the initial attachment position of the termination tape and the battery cell. At least one second pressure roller is also provided along the circumference of the battery cell. The second pressure roller is used to compact the attached termination tape to ensure the tightness of the adhesion between the termination tape and the battery cell.

7. The lithium battery winding mechanism according to claim 1, characterized in that, The identifiable mark has optical contrast with the tape substrate, including at least one of color difference, reflectivity difference, transmittance difference, or surface texture difference, to facilitate detection and identification by the optical sensor.

8. The lithium battery winding mechanism according to claim 7, characterized in that, The identifiable mark has a color difference from the tape substrate, and the optical sensor is a through-beam fiber optic sensor.

9. The lithium battery winding mechanism according to any one of claims 1-8, characterized in that, The termination tape is provided with information codes at intervals, with each information code located between two adjacent identifiable marks.

10. The lithium battery winding mechanism according to claim 9, characterized in that, The information code is a QR code.

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