Method of reducing metal dust generation during electrode coil baking transport and electrode coil

Abstract

This disclosure provides a method for reducing metal powder generation during the baking and conveying process of electrode rolls, and an electrode roll itself. The method comprises the following steps: Electrode roll A is fed into the starting rotating roller of the oven via an unwinding roller. The unwinding roller is equipped with an encoder. The drive end of the starting stepper motor is connected to the starting rotating roller, the drive end of the ending stepper motor is connected to the ending rotating roller, and the drive end of each transition stepper motor is connected to a transition rotating roller. The encoder acquires the angular displacement information of the unwinding roller's rotation to obtain a pulse electrical signal sent to the drive module. The drive module simultaneously controls the operation of the starting stepper motor, the ending stepper motor, and each transition stepper motor to complete the baking and conveying operation. Finally, the electrode roll is wound up. The addition of an encoder ensures that the rotational speed of the roller transmission assembly is essentially consistent with the rotational speed of the unwinding roller, effectively reducing the metal powder generated during the baking and conveying process of electrode roll A. It also facilitates installation, debugging, maintenance, and repair.

Description

Technical Field

[0001] This invention relates to the field of battery electrode baking and processing technology, and in particular to a method for reducing the generation of metal powder during the baking and conveying process of electrode rolls, and an electrode roll. Background Technology

[0002] In the production process of battery electrodes, such as Figure 1 As shown, after the foil is coated with a thin layer of paste, it is fed into the unwinding area through the unwinding roller, and then sent to the oven for baking. After baking, it is rolled up to obtain the electrode roll.

[0003] However, because the electrode rolls are very long, if there is no internal support in the oven, the electrode rolls located in the middle of the oven will fall to the bottom of the oven under the influence of gravity. Since the electrode rolls move inside the oven, the falling electrode rolls are prone to wear and tear on the bottom of the oven, resulting in damage to the electrode rolls.

[0004] To solve the aforementioned technical problems, most ovens on the market are equipped with internal support components, such as... Figure 1 The fixed roller shown is used to support the electrode roll in the middle of the oven, preventing it from falling off. However, because the fixed roller is a fixed metal rod, there is friction between the electrode roll and the fixed roller. Over time, metal powder is generated on the surface of the metal rod and easily adheres to the electrode roll, leading to defects such as low voltage in the subsequently produced battery cells.

[0005] To further address the friction issue between the fixed roller and the electrode roll, the following problems have arisen: Figure 2 The rotating roller support structure shown effectively reduces friction between the electrode roll and the fixed roller by setting the fixed roller and the electrode roll to rotate. However, in practical applications, because the electrode roll is too light (the thickness of the electrode roll is only about 0.1 mm), the electrode roll cannot drive the fixed roller to rotate, and friction still exists between the electrode roll and the fixed roller.

[0006] Therefore, by adding a motor and transmission components to the fixed roller, such as... Figure 3 , Figure 4 and Figure 5 As shown, this design ensures that multiple fixed rollers rotate with the electrode roll, effectively reducing friction between the electrode roll and the fixed rollers. However, because the transmission system uses multiple belts or chains to control the rotation of multiple fixed rollers, it cannot adequately ensure that each fixed roller maintains the same speed as the electrode roll, meaning that friction still exists between some fixed rollers and the electrode roll. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and electrode roll that ensures the rotational speeds of the starting stepper motor, the ending stepper motor, and each transition stepper motor are basically consistent with the rotational speed of the unwinding roller, thus ensuring that the belt speed of electrode roll A is basically consistent with the speed of the roller drive assembly, reducing friction between electrode roll A and the roller drive assembly, effectively reducing the metal powder generated during the baking and conveying process of electrode roll A, solving the problem of low voltage in the battery cell in traditional methods, and better ensuring the rotational accuracy of the roller drive assembly. It also facilitates the operator's installation, debugging, maintenance, and repair of the electrode roll, thereby reducing the generation of metal powder during the baking and conveying process of the electrode roll.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A method for reducing the generation of metal powder during the baking and conveying process of electrode rolls includes the following steps:

[0010] Obtain the coated electrode roll A;

[0011] The electrode roll A is fed into the oven via an unwinding roller, which is the starting rotating roller of the roller transmission assembly. The unwinding roller is equipped with an encoder. The roller transmission assembly includes the starting rotating roller, a starting stepper motor, an end rotating roller, an end stepper motor, a drive module, multiple transition rotating rollers, and multiple transition stepper motors. The drive end of the starting stepper motor is connected to the starting rotating roller, the drive end of the end stepper motor is connected to the end rotating roller, and the drive end of each transition stepper motor is connected to one of the transition rotating rollers. The starting stepper motor, the end stepper motor, each of the transition stepper motors, and the encoder are all electrically connected to the drive module.

[0012] The encoder obtains the angular displacement information of the unwinding roller rotation to generate a pulse electrical signal to be sent to the drive module.

[0013] The drive module simultaneously controls the start stepper motor, the end stepper motor, and each of the transition stepper motors according to the pulse electrical signal, so that the start rotating roller, the end rotating roller, and each of the transition rotating rollers rotate simultaneously to complete the baking and conveying operation;

[0014] The electrode roll A, after being baked and conveyed, is wound up to obtain the electrode roll.

[0015] In one embodiment, the encoder is a rotary encoder.

[0016] In one embodiment, the step of the drive module simultaneously controlling the start stepper motor, the end stepper motor, and each of the transition stepper motors to rotate simultaneously according to the pulse electrical signal, so as to complete the baking and conveying operation, further includes the following step:

[0017] The starting rotating roller, the ending rotating roller, and each of the transition rotating rollers are subjected to speed compensation operation.

[0018] In one embodiment, the step of performing speed compensation operation on the starting rotating roller, the ending rotating roller, and each of the transition rotating rollers includes the following specific steps:

[0019] The compensation monitoring module obtains the real-time angular displacement information of the starting rotating roller, the ending rotating roller, and each of the transition rotating rollers, calculates the voltage compensation value of the starting rotating roller, the ending rotating roller, and each of the transition rotating rollers, and sends the voltage compensation value to the drive module.

[0020] The drive module combines the voltage compensation value and the pulse electrical signal to generate a new drive voltage value, which is then applied to the starting stepper motor, the ending stepper motor, and each of the transition stepper motors.

[0021] In one embodiment, the starting stepper motor, the ending stepper motor, and each of the transition stepper motors are all low-power.

[0022] In one embodiment, the electrode thickness of the electrode roll A is ≤0.1mm.

[0023] In one embodiment, the encoder is detachably connected to the unwinding roller.

[0024] In one embodiment, the unwinding roller has a connecting shaft protruding outward along its rotational axis. The encoder includes an encoding processing body, a connector, and a locking member. The encoding processing body is connected to the connector. The connector has a snap-fit ​​groove and a threaded hole communicating with the snap-fit ​​groove. The encoder is sleeved on the connecting shaft through the snap-fit ​​groove. The locking member passes through the threaded hole to fix the connector on the connecting shaft.

[0025] In one embodiment, the starting rotating roller, the ending rotating roller, and each of the transition rotating rollers are provided with ceramic bearings.

[0026] An electrode roll is prepared using the method described in any of the above embodiments for reducing the generation of metal powder during the baking and conveying process of the electrode roll.

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] 1. By adding an encoder to the unwinding roller drive assembly, the real-time angular displacement information of the unwinding roller can be obtained and converted into pulse electrical signals. Since the encoder, the starting stepper motor, the ending stepper motor, and each transition stepper motor are all electrically connected to the drive module, the encoder can send pulse electrical signals to the drive module. The drive module then receives the pulse electrical signals and simultaneously sends drive information to the starting stepper motor, the ending stepper motor, and each transition stepper motor according to the pulse electrical signals. This allows for simultaneous control of the starting stepper motor, the ending stepper motor, and each transition stepper motor. In this way, the rotational speed of the starting stepper motor, the ending stepper motor, and each transition stepper motor is kept basically consistent with the rotational speed of the unwinding roller, ensuring that the belt speed of electrode roll A is kept basically consistent with the speed of the roller drive assembly. This reduces friction between electrode roll A and the roller drive assembly, effectively reducing the metal powder generated during the baking and conveying process of electrode roll A, thus solving the problem of low voltage in the battery cell in traditional methods.

[0029] 2. Because stepper motors can precisely control their speed, ensuring that the starting stepper motor, the ending stepper motor, and each transition stepper motor can rotate synchronously and precisely upon receiving drive information, and because each stepper motor individually controls the rotation of the starting rotating roller, the ending stepper motor individually controls the rotation of the ending rotating roller, and each transition stepper motor individually controls the rotation of its corresponding transition rotating roller—meaning each rotating roller of the roller-passing device is equipped with a stepper motor—this not only better ensures that the starting rotating roller, the ending rotating roller, and each transition rotating roller can maintain a speed essentially consistent with the unwinding roller, thus better guaranteeing the rotational accuracy of the roller-passing drive assembly, but also facilitates installation, debugging, maintenance, and repair by the operator. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a process diagram of electrode roll coating, baking, and conveying according to the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the rotating roller inside a conventional oven according to the present invention;

[0033] Figure 3 This is a schematic diagram of a conventional oven internal roller conveyor assembly according to the present invention;

[0034] Figure 4 This is a schematic diagram of another structure of the conventional oven in-mold conveyor assembly of the present invention;

[0035] Figure 5 This is a schematic diagram of another structure of the conventional oven in-mold conveyor assembly of the present invention;

[0036] Figure 6 This is a flowchart of a method for reducing metal powder generated during the baking and conveying process of electrode rolls according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the baking mechanism in one direction according to an embodiment of the present invention;

[0038] Figure 8 for Figure 7 A partial structural schematic diagram of the baking mechanism in one direction;

[0039] Figure 9 for Figure 8 A schematic diagram of the baking mechanism from another direction.

[0040] Figure 10 This is a schematic diagram of the structure of the encoder and the unwinding roller in one direction according to an embodiment of the present invention;

[0041] Figure 11 for Figure 9 The enlarged view at point C is shown below;

[0042] Figure 12 This is a schematic diagram of the structure of a starting rotating roller and a starting stepper motor connected in one direction according to an embodiment of the present invention.

[0043] Figure 13 For Figure 12 The enlarged view at point D is shown below;

[0044] Figure 14 for Figure 12 The enlarged view at point F is shown below;

[0045] Reference numerals: 10, Baking mechanism; 100, Oven; 110, Baking zone; 120, Starting fixture; 200, Roller conveyor assembly; 210, Starting rotating roller; 220, Starting stepper motor; 240, Transition stepper motor; 300, Encoder; 310, Connector; 320, Threaded hole; 330, Encoding processing body; 400, Electrode roll A; 500, Ceramic bearing; 21, Unwinding roller; 22, Rotating shaft; 23, Connecting shaft. Specific Implementation

[0046] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0047] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] This disclosure provides a method for reducing metal powder generation during the baking and conveying process of electrode rolls, comprising the following steps: obtaining a coated electrode roll A; feeding the electrode roll A onto the starting rotating roller of a roller transmission assembly of an oven via an unwinding roller, wherein the unwinding roller is equipped with an encoder, and the roller transmission assembly includes the starting rotating roller, a starting stepper motor, an end rotating roller, an end stepper motor, a drive module, multiple transition rotating rollers, and multiple transition stepper motors, wherein the drive end of the starting stepper motor is connected to the starting rotating roller, the drive end of the end stepper motor is connected to the end rotating roller, and the drive end of each transition stepper motor is connected to a... The transition roller is connected; the starting stepper motor, the ending stepper motor, each of the transition stepper motors, and the encoder are all electrically connected to the drive module; the encoder obtains the angular displacement information of the unwinding roller rotation to obtain a pulse electrical signal sent to the drive module; the drive module controls the starting stepper motor, the ending stepper motor, and each of the transition stepper motors to operate simultaneously according to the pulse electrical signal, so that the starting roller, the ending roller, and each of the transition rollers rotate simultaneously to complete the baking and conveying operation; the electrode roll A after the baking and conveying operation is wound up to obtain the electrode roll.

[0050] The aforementioned method for reducing metal powder generation during the electrode roll baking and conveying process utilizes an added encoder that acquires real-time angular displacement information of the unwinding roller and converts it into pulse electrical signals. Since the encoder, starting stepper motor, ending stepper motor, and each transition stepper motor are electrically connected to the drive module, the encoder can send pulse electrical signals to the drive module. The drive module then receives these pulse electrical signals and simultaneously sends drive information to the starting stepper motor, the ending stepper motor, and each transition stepper motor, thereby simultaneously controlling their operation. This ensures the smooth operation of the starting stepper motor, ending stepper motor, and each transition stepper motor. The speed of the end stepper motor and each transition stepper motor is basically consistent with the speed of the unwinding roller, so as to ensure that the speed of the electrode roll A is basically consistent with the speed of the roller drive assembly, reducing the friction between the electrode roll A and the roller drive assembly, effectively reducing the metal powder generated during the baking and conveying process of the electrode roll A, thus solving the problem of low voltage in the battery cell in the traditional method; and each rotating roller of the roller rotating device is equipped with a stepper motor, which not only better ensures that the speed of the starting rotating roller, the end rotating roller and each transition rotating roller is basically consistent with the speed of the unwinding roller, thus better ensuring the rotation accuracy of the roller drive assembly, but also facilitates the operator's installation, debugging, maintenance and repair.

[0051] Please see Figure 6 To better understand the technical solution and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments. One embodiment of a method for reducing metal powder generation during the baking and conveying process of electrode rolls includes some or all of the following steps:

[0052] S101. Obtain the coated electrode roll A400. It is understood that since the slurry on the freshly coated electrode roll A400 is wet, it needs to be baked.

[0053] S101. The electrode roll A400 is fed into the starting rotating roller 210 of the roller transmission assembly of the oven 100 via the unwinding roller 21. For details, please refer to [link to details]. Figures 7-9 The unwinding roller 21 is equipped with an encoder 300. The roller transmission assembly includes a starting rotating roller 210, a starting stepper motor 220, an end rotating roller, an end stepper motor, a drive module, multiple transition rotating rollers, and multiple transition stepper motors 240. The drive end of the starting stepper motor 220 is connected to the starting rotating roller 210, the drive end of the end stepper motor is connected to the end rotating roller, and the drive end of each transition stepper motor 240 is connected to one of the transition rotating rollers. The starting stepper motor 220, the end stepper motor, each of the transition stepper motors 240, and the encoder 300 are all electrically connected to the drive module.

[0054] It is understood that by adding an encoder 300 to the roll drive assembly, the real-time angular displacement information of the unwinding roll 21 can be obtained and converted into pulse electrical signals. Since the encoder 300, the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 are all electrically connected to the drive module, the encoder 300 can send pulse electrical signals to the drive module. Then, the drive module receives the pulse electrical signals and simultaneously sends signals to the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 according to the pulse electrical signals. The driving information is used to simultaneously control the operation of the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240. This ensures that the rotational speeds of the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 are basically consistent with the rotational speed of the unwinding roller 21. This ensures that the belt speed of the electrode roll A400 is basically consistent with the speed of the roller drive assembly, reducing friction between the electrode roll A400 and the roller drive assembly. This effectively reduces the metal powder generated by the electrode roll A400 during the baking and conveying process, thus solving the problem of low voltage in the battery cells in traditional methods.

[0055] Furthermore, because the stepper motor can precisely control its speed, it ensures that the starting stepper motor 220, the ending stepper motor, and each of the transition stepper motors 240 can rotate synchronously and precisely when receiving drive information. At the same time, because each stepper motor individually controls the rotation of the starting rotating roller 210, the ending stepper motor individually controls the rotation of the ending rotating roller, and each transition stepper motor 240 individually controls the rotation of its corresponding transition rotating roller, that is, each rotating roller of the roller-passing device is equipped with a stepper motor, it not only better ensures that the starting rotating roller 210, the ending rotating roller, and each transition rotating roller can maintain a basically consistent speed with the unwinding roller 21, thereby better ensuring the rotational accuracy of the roller-passing drive assembly, but also facilitates the operator's installation, debugging, maintenance, and repair.

[0056] S103. The encoder 300 obtains the angular displacement information of the unwinding roller 21 to send a pulse electrical signal to the drive module, so as to ensure that the encoder 300 can convert the angular displacement information of the unwinding roller 21 into a pulse electrical signal, so as to obtain the real-time rotation speed of the unwinding roller 21.

[0057] S104. The drive module simultaneously controls the start stepper motor 220, the end stepper motor, and each of the transition stepper motors 240 to operate according to the pulse electrical signal, so that the start rotating roller 210, the end rotating roller, and each of the transition rotating rollers rotate simultaneously, ensuring that the start rotating roller 210, the end rotating roller, and the multiple transition rotating rollers can rotate synchronously, and ensuring that the rotation speed of the roller transmission assembly and the unwinding roller 21 are basically consistent, so as to complete the baking and conveying operation.

[0058] It is understandable that the starting rotating roller 210, the ending rotating roller and multiple transition rotating rollers operate synchronously according to the driving information, so as to ensure that the friction of the electrode roll A400 is small throughout the baking and conveying process, effectively reducing the metal powder generated by the electrode roll A400 during the baking and conveying process, thus solving the problem of low voltage in the battery cell in the traditional method.

[0059] S105. The electrode roll A400 after the baking and conveying operation is wound up to effectively remove the moisture from the electrode roll A400 and obtain a dried electrode roll to provide raw materials for the battery.

[0060] The above method, by adding an encoder 300 to the over-roller drive assembly, can acquire the real-time angular displacement information of the unwinding over-roller 21 and convert it into pulse electrical signals. Since the encoder 300, the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 are all electrically connected to the drive module, the encoder 300 can send pulse electrical signals to the drive module. The drive module then receives the pulse electrical signals and, based on the pulse electrical signals, simultaneously sends drive information to the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 to simultaneously control the starting stepper motor. The starting stepper motor 220, the end stepper motor, and each transition stepper motor 240 operate, thus ensuring that the rotational speeds of the starting stepper motor 220, the end stepper motor, and each transition stepper motor 240 are basically consistent with the rotational speed of the unwinding roller 21. This ensures that the belt speed of the electrode roll A400 is basically consistent with the speed of the roller drive assembly, and ensures that the electrode roll A400 and the roller drive assembly roll forward tangentially. This reduces the friction between the electrode roll A400 and the roller drive assembly, effectively reducing the metal powder generated by the electrode roll A400 during the baking and conveying process, thereby solving the problem of low voltage in the battery cells in traditional methods.

[0061] Furthermore, since the stepper motor can precisely control its speed, it ensures that the starting stepper motor 220, the ending stepper motor, and each of the transition stepper motors 240 can rotate synchronously and precisely when receiving drive information. At the same time, since each stepper motor individually controls the rotation of the starting rotating roller 210, the ending stepper motor individually controls the rotation of the ending rotating roller, and each transition stepper motor 240 individually controls the rotation of its corresponding transition rotating roller, that is, each rotating roller of the roller-passing device is equipped with a stepper motor, it not only better ensures that the starting rotating roller 210, the ending rotating roller, and each transition rotating roller can maintain a basically consistent speed with the unwinding roller 21, thereby better ensuring the rotational accuracy of the roller-passing drive assembly, but also facilitates the operator's installation, debugging, maintenance, and repair.

[0062] It should be noted that the roller drive assembly is made of aluminum, and the electrode roll A400 uses aluminum foil as the base material. This ensures that no new metal impurities are introduced when the electrode roll A400 rolls forward tangentially with the roller drive assembly. In particular, when used with the electrode thickness of the electrode roll A400 being ≤0.1mm, this effectively ensures that the friction between the aluminum foil and the aluminum roller drive assembly is minimized, thereby effectively reducing the metal powder generated by the electrode roll A400 during the baking and conveying process.

[0063] In one embodiment, it can be understood that since the unwinding roller 21 is a roller adjacent to the feed end of the oven 100, by placing the encoder 300 here, the initial rotational speed at which the electrode roll A400 is fed into the oven 100 can be accurately obtained, thus providing the encoder 300 with an accurate information acquisition position. It is worth mentioning that, in order to better ensure the consistency of rotational speeds among the starting stepper motor 220, the ending stepper motor, and the multiple transition stepper motors 240 in the roller drive assembly, the encoder 300 is usually placed inside the starting stepper motor 220. This allows for more accurate acquisition of the initial rotational speed at which the electrode roll A400 is fed into the oven 100. However, since the temperature inside the oven 100 is high (around 100 degrees Celsius), placing the encoder 300 on the starting rotating roller 210 would not only affect the accuracy of the information acquired by the encoder 300 but also its service life, thereby increasing the cost of electrode baking. Therefore, the encoder 300 is placed on the unwinding roller 21 at the feed end of the oven 100 to ensure the accuracy of the information acquired by the encoder 300.

[0064] In one embodiment, after the step of obtaining the coated electrode roll A400, and before the step of feeding the electrode roll A400 through the unwinding roller 21 into the starting rotating roller 210 of the roller drive assembly of the oven 100, the following step is further included: the electrode roll A400 is first fed into the unwinding roller 21 through the unwinding drive roller to realize the unwinding operation of the coated electrode roll A400.

[0065] In one embodiment, the encoder 300 is a rotary encoder 300. It is understood that since the rotation of the unwinding roller 21 occurs through the interaction between the unwinding drive roller and the take-up roller, meaning the electrode roll A400 continuously drives the unwinding roller 21 to rotate during the baking and conveying process, a rotary encoder 300 is directly used in this disclosure to reduce the complexity of the encoder 300's wiring installation. This effectively reduces the complexity of the encoder 300's wiring installation and improves the stability of the connection between the unwinding roller 21 and the rotary encoder 300 during rotation. This ensures that the rotary encoder 300 accurately acquires the real-time angular displacement information of the unwinding roller 21, effectively avoiding the entanglement phenomenon that easily occurs with traditional encoders 300 during rotation, which affects the accuracy of the information acquired by the encoder 300. In one embodiment, the step in which the drive module simultaneously controls the start stepper motor 220, the end stepper motor, and each of the transition stepper motors 240 to operate according to the pulse electrical signal, so that the start rotating roller 210, the end rotating roller, and each of the transition rotating rollers rotate simultaneously to complete the baking and conveying operation, further includes the following step: performing speed compensation operation on the start rotating roller 210, the end rotating roller, and each of the transition rotating rollers.

[0066] It is understandable that although the starting rotating roller 210, the ending rotating roller, and multiple transition rotating rollers in the roller drive assembly can move synchronously according to the drive information, their actual rotational speeds are affected by some external factors. In particular, during long-term operation inside the oven 100, the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers may experience thermal expansion, resulting in a certain difference between the actual rotational speeds of the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers and the speed set in the drive information. Therefore, in this disclosure, the added compensation monitoring module can monitor the real-time rotational speeds of the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers in real time, so as to reduce the difference between the real-time rotational speeds of the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers and the unwinding roller 21 and the set speed, and ensure that the real-time rotational speeds of the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers and the unwinding roller 21 are basically consistent with the set speeds.

[0067] In one embodiment, the step of performing speed compensation operation on the starting rotating roller 210, the end rotating roller, and each of the transition rotating rollers includes the following specific steps: the compensation monitoring module obtains the real-time angular displacement information of the starting rotating roller 210, the end rotating roller, and each of the transition rotating rollers, calculates the voltage compensation value of the starting rotating roller 210, the end rotating roller, and each of the transition rotating rollers, and sends the voltage compensation value to the drive module; the drive module combines the voltage compensation value and the pulse electrical signal to generate a new drive voltage value and applies it to the starting stepper motor 220, the end stepper motor, and each of the transition stepper motors 240, respectively, to ensure that the real-time speed of the starting rotating roller 210, the end rotating roller, and the multiple transition rotating rollers and the unwinding roller 21 is basically consistent with the set speed.

[0068] In one embodiment, the starting stepper motor 220, the ending stepper motor, and each of the transition stepper motors 240 are all low-power. It is understood that in practical applications, most traditional roller drive assemblies typically use a large motor to drive their rotation. However, in reality, each roller in the roller drive assembly is designed for rotation, meaning the resistance of each roller is not very high; it can be easily rotated by hand. Furthermore, according to actual data, the power required to rotate one roller is only 10W-15W. If calculated for 15 rollers, the power required for roller rotation is 15*15W = 225W, meaning only 225W of power is needed. However, the actual motor used is several kilowatts, so most of the power is used to drive the chain, with the sprockets doing useless work, resulting in a phenomenon of high power consumption and high energy usage. Therefore, by using low-power stepper motors for the starting stepper motor 220, the ending stepper motor, and the multiple transition stepper motors 240, this disclosure ensures that the friction of the electrode roll A400 during the baking and conveying operation is minimized while ensuring precise control of the rotation speed of the starting rotating roller 210, the ending rotating roller, and the multiple transition rotating rollers. At the same time, it also saves energy and reduces the cost of baking.

[0069] In one embodiment, the electrode thickness of the electrode roll A400 is ≤0.1mm. It can be understood that the electrode thickness refers to the substrate layer of the electrode roll A400, i.e., aluminum foil is used as its substrate layer. Since aluminum foil with a thickness of ≤0.1mm has good flexibility and plasticity, when the roller drive assembly of this disclosure rolls forward tangentially with the electrode roll A400, the substrate layer of the electrode roll A400 can undergo a certain deformation, effectively reducing the friction between the electrode roll A400 and the roller drive assembly. Simultaneously, it better ensures that the electrode roll A400 can roll forward tangentially with the roller drive assembly to complete the baking and conveying operation of the electrode roll A400.

[0070] In one embodiment, the aluminum foil is a double-zero aluminum foil, which consists of two layers of aluminum foil sandwiching a plastic film to ensure that the substrate layer of the electrode roll A400 has flexibility and plasticity.

[0071] Please see Figures 7-9 In one embodiment, the coating machine includes a coating mechanism (not shown), an unwinding conveyor mechanism, a baking mechanism 10, and a take-up roller. The unwinding mechanism is located on one side of the coating mechanism. The unwinding mechanism is used to receive the coated electrode roll A400 and send the electrode roll A400 into the roller conveyor assembly 200 of the baking mechanism 10. Then, the electrode roll A400 is conveyed to the take-up roller by the starting rotating roller 210, multiple transition rotating rollers, and the end rotating roller of the roller conveyor assembly 200. Finally, the electrode roll is wound up by the take-up roller.

[0072] Please see Figures 7-9 In one embodiment, the baking mechanism 10 includes an oven 100 and a roller conveying assembly 200. A baking zone 110 is formed inside the oven 100. A starting rotating roller 210, a plurality of transition rotating rollers and an end rotating roller are spaced apart in the baking zone 110 to achieve baking and conveying of the electrode roll A400.

[0073] In one embodiment, the unwinding conveying mechanism includes an unwinding drive roller, an unwinding guide roller 21, and an unwinding motor. The unwinding drive roller is located adjacent to the coating machine mechanism, and the drive end of the unwinding motor is connected to the unwinding drive roller to drive it. The unwinding guide roller 21 is located between the unwinding drive roller and the baking mechanism 10, and is used to convey the electrode roll A400 on the unwinding drive roller to the starting rotating roller 210 in the baking mechanism 10, so as to smoothly feed the coated electrode roll A400 into the baking mechanism 10. Furthermore, in order to better control the accuracy of the rotation of the unwinding drive roller, the unwinding motor can also be a stepper motor.

[0074] It is understood that since the rotation of the unwinding roller 21 occurs due to the interaction between the unwinding drive roller and the take-up roller, in order to ensure that the unwinding roller 21 has a smooth rotation speed, in one embodiment, the horizontal height of the unwinding drive roller is lower than the height of the unwinding roller 21, and the unwinding drive roller and the unwinding roller 21 form an unwinding zone with a slope of less than 20 degrees. This ensures that the coated electrode roll A400 can be smoothly fed into the baking mechanism 10 and is not easily deformed. In particular, with the electrode thickness of the electrode roll A400 being ≤0.1mm and the use of double-zero aluminum foil, the friction of the electrode roll A400 is minimized when it is fed from the unwinding zone into the oven 100 and throughout the entire baking and conveying process, so as to more effectively avoid damage to the electrode roll A400.

[0075] In one embodiment, the starting rotating roller 210, the multiple transition rotating rollers and the end rotating roller are kept at essentially the same horizontal height as the unwinding roller 21 to ensure that the tension of the electrode roll A400 is small under the rotation conditions of the starting rotating roller 210, the multiple transition rotating rollers and the end rotating roller, so as to better ensure that the rotation speed of the starting rotating roller 210, the multiple transition rotating rollers and the end rotating roller and the unwinding roller 21 can be kept consistent, thereby reducing friction on the electrode roll A400.

[0076] In one embodiment, the horizontal height of the take-up roller is slightly lower than that of the end rotating roller, and the take-up roller and the end rotating roller form a take-up zone with a slope greater than 210 degrees. It is understood that because the newly coated electrode roll A400 has a high humidity, while the baked electrode roll A400 has a low humidity, the electrode roll A400 is closer to the starting rotating roller 210 and farther from the end rotating roller. If the horizontal heights of the take-up roller, the starting rotating roller 210, the multiple transition rotating rollers, and the end rotating roller are basically the same, the electrode roll A400 may not be able to travel well on the end rotating roller, thus affecting the take-up of the electrode roll A400. Therefore, in this disclosure, by setting the horizontal height of the take-up roller slightly lower than that of the end rotating roller, it is ensured that the take-up roller can provide a downward pulling force to the electrode roll A400, thereby ensuring that the electrode roll A400 can fit well with the end rotating roller, and ensuring that the electrode roll A400 can roll forward tangentially through the starting rotating roller 210, multiple transition rotating rollers and the end rotating roller, thereby ensuring that the friction between the electrode roll A400 and the roller drive assembly is minimized, effectively reducing the metal powder generated by the electrode roll A400 during the baking and conveying process, so as to solve the problem of low voltage in the battery cell in the traditional method.

[0077] It should also be noted that if the take-up roller and the end rotating roller form a slope of less than 210 degrees, the electrode roll A400 will experience greater tensile force. This can easily cause deformation of the electrode roll A400 and increase friction between the electrode roll A400 and the over-roller drive assembly. Therefore, in this disclosure, by setting a take-up zone with a slope greater than 210 degrees between the take-up roller and the end rotating roller, and simultaneously using an unwinding zone with a slope less than 20 degrees between the unwinding drive roller and the unwinding over-roller 21, the tension of the electrode roll A400 is ensured. The tension of 0 is moderate, which ensures that the electrode roll A400 fits well with the roller drive assembly. This ensures that the electrode roll A400 can roll forward tangentially on the starting rotating roller 210, multiple transition rotating rollers and the end rotating roller, thus ensuring that the electrode roll A400 has a fast belt speed. At the same time, it also ensures that the friction between the electrode roll A400 and the roller drive assembly is minimized, so as to reduce the metal powder generated by the electrode roll A400 during baking and conveying. It also effectively avoids the phenomenon that the electrode roll A400 is prone to deformation.

[0078] In one embodiment, the horizontal height of the take-up roller is 2cm to 50cm lower than the horizontal height of the end rotating roller.

[0079] Please see Figures 10-11 In one embodiment, the encoder 300 is detachably connected to the unwinding roller 21, allowing the operator to assemble and disassemble the encoder 300. Specifically, in one embodiment, the rotating shaft 22 of the unwinding roller 21 has a connecting shaft 23 protruding outward. The encoder 300 includes an encoding processing body 330, a connecting member 310, and a locking member. The encoding processing body 330 is connected to the connecting member 310. The connecting member 310 has a snap-fit ​​groove and a threaded hole 320 communicating with the snap-fit ​​groove. The encoder 300 is sleeved on the connecting shaft 23 through the snap-fit ​​groove, so that the encoder 300 can be sleeved on the connecting shaft 23. Furthermore, due to the locking member... The component passes through the threaded hole 320 to fix the connector 310 on the connecting shaft 23, thereby fixing the encoder 300 to the connecting shaft 23. When the operator needs to disassemble or assemble the encoder 300, the locking component can be manually unscrewed, then pulled out, and the encoder 300 can be removed from the connecting shaft 23 to complete the disassembly or assembly of the encoder 300. When the encoder 300 needs to be installed, the encoder 300 can be sleeved on the connecting shaft 23, and then the locking component can be screwed back on to complete the installation of the encoder 300.

[0080] In one embodiment, there are two locking elements and two snap-fit ​​grooves. Two threaded holes 320 are provided along the peripheral wall of the snap-fit ​​grooves, and the two threaded holes 320 can form an internal locking structure in the connector 310 to improve the stability of the connection between the encoder 300 and the connecting shaft 23, so as to better ensure that the encoder 300 is not easy to loosen or fall off when rotating with the unwinding roller 21.

[0081] Please see Figures 12-14In one embodiment, the starting rotating roller 210, the ending rotating roller, and each of the transition rotating rollers are equipped with ceramic bearings 500. It is understood that if conventional bearings are used, additional lubricating oil is required. At higher temperatures, the lubricating oil is prone to evaporation. This can affect the baking quality of the electrode roll A400, and the lubricating oil can solidify at high temperatures in the oven 100, potentially causing the starting rotating roller 210, the ending rotating roller, and each of the transition rotating rollers to jam during prolonged baking. This would prevent the electrode roll A400 from moving normally during the extended baking process. Therefore, in this disclosure, the starting rotating roller 210, the ending rotating roller, and each of the transition rotating rollers all adopt ceramic bearings 500. Since ceramic bearings 500 have high temperature resistance and wear resistance, the addition of ceramic bearings 500 can better ensure that the starting rotating roller 210, the ending rotating roller, and each transition rotating roller can keep the rotation speed consistent with the unwinding roller 21 without the need for additional lubrication. This can not only effectively reduce the generation of metal powder, but also ensure the normal belt movement of the electrode roll A400 during the long-term baking process.

[0082] In one embodiment, ceramic bearings 500 are provided at both ends of the starting rotating roller 210, both ends of the ending rotating roller, and both ends of each of the transition rotating rollers. It is understood that by providing ceramic bearings 500 at both ends of the starting rotating roller 210, the flexibility of the starting rotating roller 210 during long-term rotation is better ensured. Similarly, ceramic bearings 500 are also provided at both ends of the ending rotating roller and both ends of the multiple transition rotating rollers to better ensure the flexibility of the ending rotating roller and the multiple transition rotating rollers during long-term rotation. This better ensures that the starting rotating roller 210, the ending rotating roller, and each transition rotating roller can maintain the same rotation speed as the unwinding roller 21, thereby reducing friction between the electrode roll A400 and the roller drive assembly, and effectively reducing the metal powder generated by the electrode roll A400 during baking and conveying.

[0083] In one embodiment, the starting rotating roller 210 is located inside the oven 100. The first end of the starting rotating roller 210 is rotatably mounted on the starting fixing member 120 inside the oven 100 via a ceramic bearing 500, and the second end of the starting rotating roller 210 is rotatably mounted on the starting stepper motor 220 via another ceramic bearing 500. The starting stepper motor 220 is located on the outer wall of the oven 100 to achieve the rotational setting of the starting rotating roller 210 while ensuring the flexibility of the starting rotating roller 210 during long-term rotation. Similarly, the end rotating roller and the transition rotating roller have the same structure as the starting rotating roller 210 to ensure the flexibility of the end rotating roller and the transition rotating roller during long-term rotation.

[0084] This disclosure also provides an electrode roll, prepared using the method described in any of the above embodiments for reducing metal powder generation during the electrode roll baking and conveying process. It is understood that the electrode roll prepared using the method of this disclosure for reducing metal powder generation during the electrode roll baking and conveying process ensures that the belt speed of the electrode roll A400 is essentially consistent with the speed of the roller drive assembly, reducing friction between the electrode roll A400 and the roller drive assembly, effectively reducing the metal powder generated by the electrode roll A400 during the baking and conveying process, thus solving the problem of low voltage in the battery cell produced by traditional methods, and better ensuring the product quality of the electrode roll.

[0085] Compared with the prior art, the present invention has at least the following advantages:

[0086] 1. By adding an encoder 300 to the roll drive assembly, the real-time angular displacement information of the unwinding roll 21 can be obtained and converted into pulse electrical signals. Since the encoder 300, the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 are all electrically connected to the drive module, the encoder 300 can send pulse electrical signals to the drive module. The drive module then receives the pulse electrical signals and simultaneously sends drive signals to the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 according to the pulse electrical signals. The system simultaneously controls the operation of the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240. This ensures that the rotational speeds of the starting stepper motor 220, the ending stepper motor, and each transition stepper motor 240 are basically consistent with the rotational speed of the unwinding roller 21. This ensures that the belt speed of the electrode roll A400 is basically consistent with the speed of the roller drive assembly, reducing friction between the electrode roll A400 and the roller drive assembly. This effectively reduces the metal powder generated during the baking and conveying process of the electrode roll A400, thus solving the problem of low voltage in the battery cells produced by traditional methods.

[0087] 2. Because the stepper motor can precisely control its speed, it ensures that the starting stepper motor 220, the ending stepper motor, and each of the transition stepper motors 240 can rotate synchronously and precisely when receiving drive information. At the same time, because each stepper motor individually controls the rotation of the starting rotating roller 210, the ending stepper motor individually controls the rotation of the ending rotating roller, and each transition stepper motor 240 individually controls the rotation of its corresponding transition rotating roller, that is, each rotating roller of the roller rotating device is equipped with a stepper motor, it not only better ensures that the starting rotating roller 210, the ending rotating roller, and each transition rotating roller can maintain a basically consistent speed with the unwinding roller 21, thereby better ensuring the rotation accuracy of the roller transmission assembly, but also facilitates the operator's installation, debugging, maintenance, and repair.

[0088] The embodiments described above are merely illustrative of several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for reducing metal powder generation during the baking and conveying process of electrode rolls, characterized in that, Includes the following steps: Obtain coated electrode roll A; The electrode roll A is fed into the oven via an unwinding roller, which is the starting rotating roller of the roller transmission assembly. The unwinding roller is equipped with an encoder. The roller transmission assembly includes the starting rotating roller, a starting stepper motor, an end rotating roller, an end stepper motor, a drive module, multiple transition rotating rollers, and multiple transition stepper motors. The drive end of the starting stepper motor is connected to the starting rotating roller, the drive end of the end stepper motor is connected to the end rotating roller, and the drive end of each transition stepper motor is connected to one of the transition rotating rollers. The starting stepper motor, the end stepper motor, each of the transition stepper motors, and the encoder are all electrically connected to the drive module. The encoder obtains the angular displacement information of the unwinding roller rotation to generate a pulse electrical signal to be sent to the drive module. The drive module simultaneously controls the start stepper motor, the end stepper motor, and each of the transition stepper motors according to the pulse electrical signal, so that the start rotating roller, the end rotating roller, and each of the transition rotating rollers rotate simultaneously to complete the baking and conveying operation; The electrode roll A, after being baked and conveyed, is wound up to obtain the electrode roll.

2. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The encoder is a rotary encoder.

3. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The step in which the drive module simultaneously controls the starting stepper motor, the ending stepper motor, and each of the transition stepper motors to rotate simultaneously according to the pulse electrical signal, thereby completing the baking and conveying operation, further includes the following step: The starting rotating roller, the ending rotating roller, and each of the transition rotating rollers are subjected to speed compensation operation.

4. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 3, characterized in that, The step of performing speed compensation operation on the starting rotating roller, the ending rotating roller, and each of the transition rotating rollers includes the following specific steps: The compensation monitoring module obtains the real-time angular displacement information of the starting rotating roller, the ending rotating roller and each of the transition rotating rollers, calculates the voltage compensation value of the starting rotating roller, the ending rotating roller and each of the transition rotating rollers, and sends the voltage compensation value to the drive module. The drive module combines the voltage compensation value and the pulse electrical signal to generate a new drive voltage value, which is then applied to the starting stepper motor, the ending stepper motor, and each of the transition stepper motors.

5. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The electrode thickness of electrode roll A is ≤0.1mm.

6. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The encoder is detachably connected to the unwinding roller.

7. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The unwinding roller has a connecting shaft protruding outward along its rotation axis. The encoder includes an encoding processing body, a connecting member, and a locking member. The encoding processing body is connected to the connecting member. The connecting member has a snap-fit ​​groove and a threaded hole communicating with the snap-fit ​​groove. The encoder is sleeved on the connecting shaft through the snap-fit ​​groove. The locking member passes through the threaded hole to fix the connecting member on the connecting shaft.

8. The method for reducing metal powder generation during the baking and conveying process of electrode rolls according to claim 1, characterized in that, The starting rotating roller, the ending rotating roller, and each of the transition rotating rollers are all equipped with ceramic bearings.

9. An electrode roll, characterized in that, It is prepared by the method described in any one of claims 1 to 8 for reducing the generation of metal powder during the baking and conveying process of the electrode roll.

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