Winding device

Abstract

The invention discloses winding equipment. The winding equipment comprises a winding needle, a cutting device and a dust removal device. The cutting device is used for cutting and segmenting the pole piece; and the dust removal device is arranged between the winding needle and the cutting device and is used for removing foreign matters on the pole piece. In the winding equipment provided by the embodiment of the invention, the pole piece is cut and segmented by the cutting device, and the pole piece with proper length can be obtained, so that the pole piece is matched with the specification required by the battery monomer. In the process of cutting the pole piece by the cutting device, foreign matters can be generated on the pole piece. And the dust removal device can remove the foreign matters, so that the probability that the pole piece or the diaphragm is punctured during winding or after winding can be reduced, and the probability that the battery monomers fail to work can be further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing equipment, and in particular to a winding equipment. Background Art

[0002] In the manufacturing process of the battery cell, the winding equipment uses the winding needle to wind the negative electrode sheet, positive electrode sheet and separator according to certain rules. For the sake of production continuity and production efficiency, the electrode sheet is usually a long electrode sheet strip. Since the electrode sheet required for the manufacture of a single battery cell is generally a part of the electrode sheet strip, it is necessary to process the electrode sheet strip in sections.

[0003] In the related art, the cutting device cuts the pole sheet strip to form multiple pole sheets. However, during the cutting process, the pole sheet is prone to produce defects such as particles or debris, which may cause the pole sheet or the diaphragm to be punctured during or after winding, thereby causing the battery cell to fail. Summary of the invention

[0004] The present invention provides a winding device, which can solve the problem that during the cutting process, the pole piece is prone to produce particles or debris, which may cause the pole piece or the diaphragm to be punctured during or after winding, thereby causing functional failure of the battery cell.

[0005] The winding device according to the embodiment of the present invention comprises:

[0006] Rolling needle;

[0007] A cutting device, the cutting device is used to cut the pole piece into segments; and

[0008] A dust removal device is arranged between the winding needle and the cutting device, and is used to remove foreign matter on the pole piece.

[0009] In the winding device of the embodiment of the present invention, the cutting device cuts the pole piece into segments to obtain pole pieces of appropriate length, thereby matching the specifications required by the battery cell. During the process of the cutting device cutting the pole piece, foreign matter will be generated on the pole piece. The dust removal device can remove these foreign matter, thereby reducing the probability of the pole piece or the diaphragm being punctured during or after winding, and further reducing the probability of functional failure of the battery cell.

[0010] In some embodiments, the dust removal device is formed with a dust suction hole, and the dust suction hole is used to form a negative pressure to absorb the foreign matter by means of negative pressure.

[0011] In this way, by creating a negative pressure environment, foreign matter will be sucked into the dust suction hole, thereby effectively reducing the possibility of foreign matter remaining.

[0012] In some embodiments, the dust suction hole adsorbs the pole piece onto the dust removal device. In this way, the dust suction hole can not only be used to absorb foreign matter, thereby reducing the probability of foreign matter on the pole piece, but also stabilize the pole piece, thereby keeping the pole piece stable.

[0013] In some embodiments, the dust removal device includes a bracket and a conveyor belt wound on the bracket, the conveyor belt is formed with the dust suction hole, the bracket is formed with a negative pressure chamber connected to the dust suction hole, the electrode sheet is adsorbed on the conveyor belt, and the conveyor belt transports the electrode sheet from the cutting device to the winding needle.

[0014] In this way, through the design of the dust suction hole and the pole piece being adsorbed on the conveyor belt, the pole piece can maintain a stable position, reducing displacement or loosening during the conveying process. The negative pressure chamber is connected to the dust suction hole to form a negative pressure environment. This helps to remove foreign matter on the pole piece, reduce the residue of foreign matter, and reduce the adverse effects of foreign matter on the pole piece or diaphragm.

[0015] In some embodiments, the support includes two connecting rollers arranged in parallel, and the conveyor belt is wound on the two connecting rollers; the winding device includes a power component connected to at least one of the connecting rollers, and the power component drives at least one of the connecting rollers to rotate, thereby driving the conveyor belt to rotate.

[0016] In this way, the two parallel connecting rollers help to maintain the consistent position of the pole piece on the conveyor belt, reduce the risk of displacement or offset, and improve the movement stability of the pole piece. The connecting roller and the power assembly can realize the smooth rotation of the conveyor belt, thereby realizing the stable transmission of the pole piece.

[0017] In addition, due to the smooth movement of the conveyor belt, the cutting device can more accurately cut the pole piece into the required segments, thereby improving the accuracy of battery cell manufacturing.

[0018] In some embodiments, the dust removal device includes a dust suction pipe disposed on the bracket, and the dust suction pipe is connected to the negative pressure chamber.

[0019] In this way, the suction tube can absorb foreign matter in the negative pressure chamber, prevent foreign matter from accumulating in the negative pressure chamber, and thus increase the service life of the negative pressure chamber. In addition, the suction tube may be connected to a pump body, which can further discharge foreign matter in the suction tube.

[0020] In some embodiments, the number of the cutting devices is two, one of the cutting devices is used to cut the first pole piece, and the other cutting device is used to cut the second pole piece, the pole piece includes the first pole piece and the second pole piece, and the polarities of the first pole piece and the second pole piece are opposite;

[0021] There are two dust removal devices in number and they correspond one to one with the cutting devices, wherein one of the dust removal devices is used to remove foreign matter from the first pole piece, and the other dust removal device is used to remove foreign matter from the second pole piece.

[0022] In this way, the two cutting devices can cut the first pole piece and the second pole piece respectively, thereby improving the cutting efficiency and effect. The two dust removal devices can remove dust from the first pole piece and the second pole piece respectively, thereby improving the dust removal efficiency and effect.

[0023] In certain embodiments, the winding device includes a detection device disposed on one side of the winding needle, and the detection device is used to detect the relative position of the first pole piece and the second pole piece.

[0024] In this way, the detection device can detect the relative position of the first pole piece and the second pole piece, thereby confirming that the first pole piece and the second pole piece are in the correct position, reducing the problem of battery cell performance degradation caused by the relative position error of the first pole piece and the second pole piece.

[0025] In some embodiments, the winding device further includes a driving device, which is connected to the dust removal device. When the detection device detects that the first pole piece and the second pole piece are offset from each other, the driving device can drive the dust removal device to move.

[0026] In this way, the driving device can work in coordination with the detection device. When the detection device detects that the first pole piece and the second pole piece are offset from each other, the driving device can automatically drive the dust removal device to move to correct the position of the pole piece. Automatic correction of the offset helps to ensure that the relative position of the first pole piece and the second pole piece is always correct, thereby reducing the problem of battery cell performance degradation caused by the relative position error of the first pole piece and the second pole piece.

[0027] In certain embodiments, the winding device includes a conveying device disposed between the dust removal device and the cutting device, and the conveying device is used to convey the pole piece to the winding needle.

[0028] In this way, the conveying device enables the pole piece to be smoothly conveyed from the cutting device to the winding needle, which helps to improve the conveying efficiency of the pole piece.

[0029] In some embodiments, the conveying device includes two clamping rollers arranged opposite to each other, and the two clamping rollers clamp the pole piece together.

[0030] In this way, the two clamping rollers clamp the pole piece together, so that the pole piece can be transported stably, thereby reducing loosening or misalignment of the pole piece during the transport process, and further reducing stagnation or interruption during the transport of the pole piece.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 A schematic diagram of the structure of a winding device provided in some embodiments of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a dust removal device provided in some embodiments of the present invention;

[0035] Figure 3 A cross-sectional view of a dust removal device and a pole piece provided for some embodiments of the present invention;

[0036] Figure 4 A schematic diagram of the structure of a winding device provided in some embodiments of the present invention;

[0037] Figure 5 for Figure 4 An enlarged view of part a of the winding device;

[0038] Figure 6 A schematic diagram of the arrangement of dust suction holes provided in some embodiments of the present invention;

[0039] Figure 7 A schematic diagram of the arrangement of dust suction holes provided in some embodiments of the present invention;

[0040] Figure 8 A schematic structural diagram of a dust removal device provided in some embodiments of the present invention.

[0041] Description of reference numerals:

[0042] Winding device 100; winding needle 10; cutting device 20; pole piece 200; first pole piece 201; second pole piece 202; diaphragm 300; dust removal device 30; dust suction hole 101; bracket 31; conveyor belt 32; negative pressure chamber 310; connecting roller 311; power assembly 40; motor 41; belt 42; dust suction pipe 33; connecting pipe 34; detection device 50; driving device 60; mounting platform 102; conveying device 70; clamping roller 71. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

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

[0051] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0052] In the manufacturing process of the battery cell, in order to obtain a higher energy density, the electrode assembly of the battery cell is processed and manufactured by a winding device. The winding device winds the negative electrode sheet, the positive electrode sheet and the separator according to certain rules through a winding needle. Among them, the electrode sheet is obtained by cutting the electrode sheet strip. Specifically, the electrode sheet strip is cut by a cutting device to divide the electrode sheet strip into multiple electrode sheets required for multiple battery cells.

[0053] However, due to the influence of cutting speed, the properties of the cutting device and the properties of the pole piece strip, the pole piece strip is prone to produce more particles or debris during the cutting process, which may adhere to the surface of the pole piece or diaphragm, or to the area between the pole piece and the diaphragm. This will cause the pole piece or diaphragm to be punctured during or after winding, resulting in functional failure of the battery cell.

[0054] In order to reduce the probability of defective particles or debris, the winding device of the embodiment of the present invention provides a dust removal device. The dust removal device can be used to remove foreign matter on the pole piece, that is, it can remove particles or debris generated in the process of cutting the pole piece strip. This reduces the probability of particles or debris on the surface of the pole piece or diaphragm after the pole piece strip is cut, thereby reducing the probability of the pole piece or diaphragm being punctured during or after winding, and the probability of functional failure of the battery cell is also reduced.

[0055] The winding device disclosed in the embodiment of the present invention can be used in the winding process in the battery manufacturing process, and can be specifically used for winding the pole piece and the separator. In the battery manufacturing process, the pole piece and the separator are wound together by the winding device to form an electrode assembly.

[0056] See also Figure 1 , Figure 1 A schematic diagram of the structure of a winding device 100 provided in some embodiments of the present invention. The winding device 100 of the embodiment of the present invention comprises a winding needle 10, a cutting device 20 and a dust removal device 30. The cutting device 20 is used to cut the pole piece 200 into segments; the dust removal device 30 is arranged between the winding needle 10 and the cutting device 20 to remove foreign matter on the pole piece 200.

[0057] Specifically, the winding device 100 is a device for winding the pole piece 200 and the separator 300 according to a certain rule to form an electrode assembly of a battery cell. The winding needle 10 is a device for winding in the winding device 100. The winding needle 10 can rotate, thereby driving the pole piece 200 and the separator 300 wound on the winding needle 10 to be wound together to form an electrode assembly. The shape of the winding needle 10 can be a regular shape such as a cylinder, a cone, or an irregular shape. According to the different shapes of the winding needle 10, the electrode assembly can present different shapes.

[0058] The cutting device 20 is a device that can cut a long pole piece strip into a suitable length so that the size of the pole piece 200 can adapt to the specifications required by the battery cell. The cutting device 20 can cut the pole piece 200 by laser cutting, mechanical cutting, etc. For example, the cutting device 20 can use a cutter to cut the pole piece 200. The specific cutting method can be selected according to the different thicknesses and materials of the pole piece 200, and the embodiments of the present invention are not limited to this.

[0059] The dust removal device 30 can remove foreign matter on the pole piece 200 by negative pressure adsorption, electrostatic adsorption or mechanical removal. In one embodiment, the dust removal device 30 removes foreign matter on the pole piece 200 by electrostatic adsorption. The dust removal device 30 includes an electrostatic generator, which can generate an electrostatic field. When the pole piece 200 enters the area of ​​the dust removal device 30, the electrostatic generator generates an electrostatic field. This electrostatic field can be transmitted to the surface of the pole piece 200, and the electrostatic field can attract foreign matter, so that the foreign matter is separated from the surface of the pole piece 200, thereby achieving the purpose of removing foreign matter on the pole piece 200.

[0060] Furthermore, a dust collector or a collecting device may be installed around the electrostatic generator, and the dust collector or the collecting device may be used to collect the adsorbed foreign matter. Moreover, after the foreign matter is adsorbed, the foreign matter may be discharged or transferred to the outside through a cleaning channel connected to the dust collector or the collecting device.

[0061] It can be understood that the electrostatic generator in the above embodiment can be replaced by a brush. The brush can be set close to the surface of the pole piece 200. The brush can brush foreign matter away from the pole piece 200 by rotating, thereby removing foreign matter on the pole piece 200.

[0062] The foreign matter may be particles and debris generated by the cutting device 20 when cutting the pole piece 200 , or may be foreign matter such as dust attached to the pole piece 200 .

[0063] In the winding device 100 of the embodiment of the present invention, the cutting device 20 cuts the pole piece 200 into segments, and the pole piece 200 of appropriate length can be obtained, so as to match the specifications required by the battery cell. In the process of cutting the pole piece 200 by the cutting device 200, foreign matter will be generated on the pole piece 200. The dust removal device 30 can remove these foreign matter, so as to reduce the probability of the pole piece 200 or the diaphragm 300 being punctured during or after winding, and further reduce the probability of functional failure of the battery cell.

[0064] See also Figure 2 , Figure 2 The schematic diagram of the structure of the dust removal device 30 provided in some embodiments of the present invention. In some embodiments, the dust removal device 30 is formed with a dust suction hole 101, and the dust suction hole 101 is used to form a negative pressure to absorb foreign matter by means of negative pressure.

[0065] Specifically, the shape of the dust suction hole 101 can be a regular shape such as a circle or a square, or can be an irregular shape. The number of the dust suction holes 101 can be one or more, for example, the number of the dust suction holes 101 can be one, two, three or even more.

[0066] The dust suction hole 101 can generate negative pressure by connecting to a vacuum pump or a vacuum system. The vacuum pump creates a low-pressure area by extracting air from the dust removal device 30, so that foreign matter can be sucked up. The adsorption force that the dust suction hole 101 can generate can be adjusted by the vacuum pump to adapt to different usage environments. For example, when the dust suction hole 101 is far away from the foreign matter, the dust suction hole 101 can provide a greater adsorption force; when the dust suction hole 101 is close to the foreign matter, the dust suction hole 101 can provide a smaller adsorption force.

[0067] In this way, by creating a negative pressure environment, foreign matter will be sucked into the dust suction hole 101, thereby effectively reducing the possibility of foreign matter remaining.

[0068] See also Figure 3 , Figure 3 The cross-sectional view of the dust removal device 30 and the pole piece 200 provided in some embodiments of the present invention. It is worth noting that: Figure 3 The fitting state of the pole piece 200 and the dust removal device 30 is only a schematic representation and should not be construed as a limitation on the embodiments of the present invention.

[0069] In some embodiments, the dust suction hole 101 adsorbs the electrode 200 on the dust removal device 30. Specifically, an adsorption force can be generated in the dust suction hole 101, so that the electrode 200 is adsorbed on the dust removal device 30. When the electrode 200 and the diaphragm 300 are cut off, the ends of the previous electrode assembly and the next electrode assembly are in a free state. For example, the tail of the previous electrode assembly and the head of the next electrode assembly are in a free state, or the tail of the previous electrode assembly and the head of the next electrode assembly are prone to swing or offset.

[0070] This swing or deviation of the head and tail will lead to an increased risk of OH (overhang, excessive negative electrode) defects, which is specifically manifested as OH being lower than the lower limit, thereby adversely affecting the yield of the winding process and even affecting the energy density of the battery cell.

[0071] Among them, OH refers to the fact that the negative electrode in the electrode 200 has a part of the positive electrode in the length and width direction. The lower limit of OH can ensure that the negative electrode and the positive electrode maintain a certain relative position, otherwise it is easy to cause poor lithium deposition, specifically, the two electrode pieces 200 are offset in the length or width direction, and lithium ions are not transferred from one electrode piece 200 to the other electrode piece 200, but are deposited in the area outside the electrode piece 200, thereby generating lithium crystals, resulting in punctures, cuts and other defects in the electrode assembly formed by the electrode piece 200, and then causing safety risks to the battery cell.

[0072] Therefore, in order to solve the problem that the ends of the negative electrode sheet and the positive electrode sheet may swing, resulting in the negative electrode sheet and the positive electrode sheet being unable to be in the correct position after winding, it is necessary to use the dust suction hole 101 to adsorb the electrode sheet 200 onto the dust removal device 30.

[0073] In this way, the dust suction hole 101 can not only be used to absorb foreign matter, thereby reducing the probability of foreign matter existing on the pole piece 200, but also stabilize the pole piece 200, thereby keeping the pole piece 200 stable.

[0074] See also Figure 3 , Figure 4 and Figure 5 , Figure 4 A schematic diagram of the structure of a winding device 100 provided in some embodiments of the present invention, Figure 5 for Figure 4 An enlarged view of part a of the winding device 100. In some embodiments, the dust removal device 30 includes a bracket 31 and a conveyor belt 32 wound on the bracket 31, the conveyor belt 32 is formed with a dust suction hole 101, the bracket 31 is formed with a negative pressure chamber 310 connected to the dust suction hole 101, the pole piece 200 is adsorbed on the conveyor belt 32, and the conveyor belt 32 conveys the pole piece 200 from the cutting device 20 to the winding needle 10.

[0075] Specifically, the support 31 may be a hollow shaft, rod or other structure with a certain shape and rigidity. The conveyor belt 32 may be wound on the outer surface of the support 31, and the support 31 may provide support for the conveyor belt 32. The dust suction hole 101 may be a through hole that penetrates the conveyor belt 32.

[0076] See also Figure 6 and Figure 7 , Figure 6 A schematic diagram of the arrangement of the dust suction holes 101 provided in some embodiments of the present invention, Figure 7 Schematic diagram of the arrangement of the dust suction holes 101 provided in some embodiments of the present invention. The dust suction holes 101 can be arranged regularly on the conveyor belt 32, such as a rectangular arrangement, a triangular arrangement, etc., or can be arranged irregularly.

[0077] The negative pressure chamber 310 may have a negative pressure environment, which may be formed by a vacuum pump extracting air from the negative pressure chamber 310. The negative pressure environment may enable the dust suction holes 101 connected to the negative pressure chamber 310 to generate an adsorption force. The conveyor belt 32 may adsorb the pole piece 200 on the conveyor belt 32 through the adsorption force generated by the dust suction holes 101 on the surface, and may convey the pole piece 200 from the cutting device 20 to the winding needle 10 through the friction between the pole piece 200 and the conveyor belt 32.

[0078] Thus, through the design of the dust suction hole 101 and the pole piece 200 being adsorbed on the conveyor belt 32, the pole piece 200 can maintain a stable position, reducing displacement or looseness during the conveying process. The negative pressure chamber 310 is connected to the dust suction hole 101 to form a negative pressure environment. This helps to remove foreign matter on the pole piece 200, reduces the residue of foreign matter, and reduces the adverse effects of foreign matter on the pole piece 200 or the diaphragm 300.

[0079] See also Figure 4 and Figure 8 , Figure 8 A schematic diagram of the structure of a dust removal device 30 provided in some embodiments of the present invention. In some embodiments, the bracket 31 includes two connecting rollers 311 arranged in parallel, and the conveyor belt 32 is wound on the two connecting rollers 311; the winding device 100 includes a power component 40 connected to at least one connecting roller 311, and the power component 40 drives at least one connecting roller 311 to rotate, so as to drive the conveyor belt 32 to rotate.

[0080] Specifically, the conveyor belt 32 can be wound on the outer surfaces of the two connecting rollers 311, and the conveyor belt 32 can move by the friction between the two connecting rollers 311. The power assembly 40 can drive the connecting rollers 311 to rotate by means of motor drive, cylinder drive, etc., thereby driving the conveyor belt 32 to rotate. For example, the power assembly 40 may include a motor 41 and a belt 42, and the motor 41 may be mounted on the bracket 31 by means of mechanical connection; one end of the belt 42 may be sleeved on the driving shaft of the motor 41, and the other end of the belt 42 may be sleeved on the connecting rollers 311. When the motor 41 rotates, the belt 42 sleeved on the driving shaft of the motor 41 can rotate, thereby driving the connecting rollers 311 to rotate, and then driving the conveyor belt 32 to rotate. Among them, the mechanical connection may include a key connection, a bolt connection, etc.

[0081] Furthermore, during the rotation of the conveyor belt 32 , the pole piece 200 can be driven to move through the friction between the conveyor belt 32 and the pole piece 200 .

[0082] In this way, the two parallel connection rollers 311 help to maintain the consistent position of the pole piece 200 on the conveyor belt 32, reduce the risk of displacement or offset, and improve the movement stability of the pole piece 200. The connection rollers 311 and the power assembly 40 can cooperate to achieve a smooth rotation of the conveyor belt 32, thereby achieving stable transmission of the pole piece 200.

[0083] In addition, due to the smooth movement of the conveyor belt 32, the cutting device 20 can more accurately cut the pole piece 200 into the required segments, thereby improving the accuracy of battery cell manufacturing.

[0084] See also Figure 2 , Figure 4 and Figure 8 In some embodiments, the dust removal device 30 includes a dust suction pipe 33 disposed on the bracket 31 , and the dust suction pipe 33 is connected to the negative pressure chamber 310 .

[0085] Specifically, the dust suction pipe 33 can be arranged on the bracket 31 by mechanical connection, for example, the dust suction pipe 33 can be arranged on the bracket 31 by bolt connection, welding, etc. The dust suction pipe 33 and the negative pressure chamber 310 inside the bracket 31 can be connected through a connecting pipe 34. For example, the bracket 31 can include an opening toward the connecting pipe 34, the opening is connected to the negative pressure chamber 310, the connecting pipe 34 can be inserted into the opening, and the diameter of the connecting pipe 34 can be equal to the diameter of the opening.

[0086] Negative pressure may be formed in the dust suction tube 33 , and the pressure in the dust suction tube 33 is lower than the pressure in the negative pressure chamber 310 , thereby forming a pressure difference so that foreign matter in the negative pressure chamber 310 can be sucked into the dust suction tube 33 .

[0087] In this way, the dust suction pipe 33 can absorb foreign matter in the negative pressure chamber 310, prevent foreign matter from accumulating in the negative pressure chamber 310, and thus improve the service life of the negative pressure chamber 310. In addition, the dust suction pipe 33 may be connected to a pump body, which can further discharge foreign matter in the dust suction pipe 33.

[0088] See also Figure 1 In some embodiments, the number of the cutting devices 20 is two, wherein one cutting device 20 is used to cut the first pole piece 201, and the other cutting device 20 is used to cut the second pole piece 202, the pole piece 200 includes the first pole piece 201 and the second pole piece 202, and the first pole piece 201 and the second pole piece 202 have opposite polarities;

[0089] There are two dust removal devices 30 corresponding to the cutting devices 20 one by one, wherein one dust removal device 30 is used to remove foreign matter from the first pole piece 201 , and the other dust removal device 30 is used to remove foreign matter from the second pole piece 202 .

[0090] Specifically, the first electrode sheet 201 may be a positive electrode sheet, and the second electrode sheet 202 may be a negative electrode sheet. The two cutting devices 20 may cut the negative electrode sheet and the positive electrode sheet respectively in the same manner, or the two cutting devices 20 may cut the negative electrode sheet and the positive electrode sheet respectively in different manners. For example, one cutting device 20 may cut the positive electrode sheet by mechanical cutting, and the other cutting device 20 may cut the positive electrode sheet by laser cutting.

[0091] Similarly, the two dust removal devices 30 can remove foreign matter on the surface of the negative electrode sheet and the positive electrode sheet in the same manner, or they can remove foreign matter on the surface of the negative electrode sheet and the positive electrode sheet in different manners. For example, both dust removal devices 30 can remove foreign matter on the surface of the negative electrode sheet and the positive electrode sheet by negative pressure adsorption.

[0092] Thus, the two cutting devices 20 can cut the first pole piece 201 and the second pole piece 202 respectively, thereby improving the cutting efficiency and effect. The two dust removal devices 30 can remove dust from the first pole piece 201 and the second pole piece 202 respectively, thereby improving the dust removal efficiency and effect.

[0093] See also Figure 1 In some embodiments, the winding device 100 includes a detection device 50 disposed on one side of the winding needle 10 , and the detection device 50 is used to detect the relative position of the first pole piece 201 and the second pole piece 202 .

[0094] Specifically, the detection device 50 may be a CCD (Charged-Coupled Device), a photoelectric sensor, etc. For example, the CCD may be arranged on one side of the winding needle 10 and facing the first pole piece 201 and the second pole piece 202. The CCD may acquire an optical image of the end region of the first pole piece 201 and the second pole piece 202, thereby realizing the detection of the relative position of the first pole piece 201 and the second pole piece 202. Furthermore, the CCD may also convert the optical image into a digital signal so as to analyze, process and store the optical image.

[0095] In this way, the detection device 50 can detect the relative position of the first pole piece 201 and the second pole piece 202, thereby confirming that the first pole piece 201 and the second pole piece 202 are in the correct position, reducing the problem of battery cell performance degradation caused by the relative position error of the first pole piece 201 and the second pole piece 202.

[0096] See also Figure 1 and Figure 4 In some embodiments, the winding device 100 also includes a driving device 60, which is connected to the dust removal device 30. When the detection device 50 detects that the first pole piece 201 and the second pole piece 202 are offset from each other, the driving device 60 can drive the dust removal device 30 to move.

[0097] Specifically, the driving device 60 adjusts the position of the dust removal device 30, thereby adjusting the relative position between the first pole piece 201 and the second pole piece 202, so that the first pole piece 201 and the second pole piece 202 are in the correct position. This can control the swing amount or offset amount of the head or tail of the first pole piece 201 and the second pole piece 202, so that the first pole piece 201 and the second pole piece 202 are in the correct position.

[0098] It can be understood that the mutual offset of the first pole piece 201 and the second pole piece 202 may cause poor OH. The driving device 60 can adjust the dust removal device 30, thereby adjusting the position of the first pole piece 201 and the second pole piece 202 adsorbed on the dust removal device 30 so that OH is higher than the lower limit value.

[0099] The driving device 60 may be directly connected to the dust removal device 30, or may be indirectly connected to the dust removal device 30. For example, the driving shaft of the driving device 60 may be connected to the dust removal device 30 by mechanical connection, and further, the driving shaft of the driving device 60 may be connected to the bracket 31 of the dust removal device 30 by thread connection, welding, etc., so as to realize driving of the dust removal device 30.

[0100] See also Figure 4In one embodiment, the dust removal device 30 can be set on the installation platform 102, and the bracket 31 of the dust removal device 30 can be connected to the installation platform 102 by threaded connection, welding, etc. The driving device 60 can drive the installation platform 102 to move, thereby driving the dust removal device 30 to move.

[0101] The driving device 60 can drive the dust removal device 30 by motor drive, cylinder drive, etc. For example, the driving device 60 can include a motor, and the driving shaft of the motor can be connected to the bracket 31 of the dust removal device 30, so that the dust removal device 30 can move under the drive of the motor.

[0102] In this way, the driving device 60 can work in coordination with the detection device 50. When the detection device 50 detects that the first pole piece 201 and the second pole piece 202 are offset from each other, the driving device 60 can automatically drive the dust removal device 30 to move to correct the position of the pole piece 200. Automatic correction of the offset helps to ensure that the relative position of the first pole piece 201 and the second pole piece 202 is always correct, thereby reducing the problem of battery cell performance degradation caused by the relative position error of the first pole piece 201 and the second pole piece 202.

[0103] See also Figure 1 In some embodiments, the winding device 100 includes a conveying device 70 disposed between the dust removal device 30 and the cutting device 20 , and the conveying device 70 is used to convey the pole piece 200 to the winding needle 10 .

[0104] Specifically, the conveying device 70 can be a conveyor belt, a roller or other types of devices, and the conveying device 70 can be used to convey the pole piece 200 from one position to another, specifically to convey the pole piece 200 to a position close to the winding needle 10 so that the pole piece 200 can be wound on the winding needle 10.

[0105] The conveying device 70 can also be used to convey the diaphragm 300 from one position to another position, specifically to convey the diaphragm 300 to a position close to the winding needle 10 so that the diaphragm 300 and the electrode plate 200 are wound to form an electrode assembly.

[0106] In this way, the conveying device 70 enables the pole piece 200 to be smoothly conveyed from the cutting device 20 to the winding needle 10 . This helps to improve the conveying efficiency of the pole piece 200 .

[0107] See also Figure 1 In some embodiments, the conveying device 70 includes two clamping rollers 71 arranged opposite to each other, and the two clamping rollers 71 clamp the pole piece 200 together.

[0108] Specifically, the two clamping rollers 71 may be rollers with surface textures or other features to provide sufficient friction and control force, so that the pole piece 200 can be stably conveyed. Further, the pole piece 200 is pushed or pulled by the two clamping rollers 71, so that the pole piece 200 can be stably conveyed to the winding needle 10.

[0109] The two clamping rollers 71 may be connected to structures such as motors and cylinders, so as to achieve multi-directional movement to adjust the position of the clamped pole piece 200 , thereby achieving adjustment of the relative position of the first pole piece 201 and the second pole piece 202 .

[0110] In this way, the two clamping rollers 71 clamp the pole piece 200 together, so that the pole piece 200 can be stably transported, thereby reducing looseness or misalignment of the pole piece 200 during the transport process, and further reducing stagnation or interruption of the pole piece 200 during the transport process.

[0111] See also Figure 1 and Figure 4 In a specific embodiment, the winding device 100 includes a winding needle 10, a cutting device 20 and a dust removal device 30. The cutting device 20 includes a cutter, which cuts the pole piece 200 into segments. The dust removal device 30 includes a bracket 31 and a conveyor belt 32 wound on the bracket 31, the conveyor belt 32 is formed with a dust suction hole 101, and the bracket 31 is formed with a negative pressure chamber 310 connected to the dust suction hole 101. A negative pressure environment can be formed in the negative pressure chamber 310, so that the dust suction hole 101 generates an adsorption force, so that the dust suction hole 101 removes foreign matter on the pole piece 200. The dust suction hole 101 can also be used to adsorb the pole piece 200 so that the pole piece 200 is in the correct position.

[0112] The winding device 100 further includes a detection device 50, a driving device 60 and a conveying device 70. The detection device 50 may be a CCD, and the detection device 50 may obtain optical images of the first pole piece 201 and the second pole piece 202, thereby detecting the relative position of the first pole piece 201 and the second pole piece 202.

[0113] The driving device 60 may include a motor, and the driving shaft of the motor may be connected to the dust removal device 30 by means of a hole-shaft fit. When the detection device 50 detects that the first pole piece 201 and the second pole piece 202 are offset from each other, the driving device 60 may drive the dust removal device 30 to move. The conveying device 70 includes two clamping rollers 71 arranged opposite to each other, and the two clamping rollers 71 clamp the pole piece 200 together, so that the pole piece 200 can be stably conveyed and the position of the pole piece 200 can be adjusted.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A winding device, characterized in that: include: Rolling needle; A cutting device, the cutting device is used to cut the pole piece into segments; and A dust removal device is arranged between the winding needle and the cutting device, and is used to remove foreign matter on the pole piece.

2. The winding device according to claim 1, characterized in that: The dust removal device is formed with a dust suction hole, and the dust suction hole is used to form a negative pressure to absorb the foreign matter by means of negative pressure.

3. The winding device according to claim 2, characterized in that The dust suction hole adsorbs the pole piece onto the dust removal device.

4. The winding device according to claim 3, characterized in that The dust removal device includes a bracket and a conveyor belt wound on the bracket, the conveyor belt is formed with the dust suction hole, the bracket is formed with a negative pressure chamber connected to the dust suction hole, the electrode sheet is adsorbed on the conveyor belt, and the conveyor belt transports the electrode sheet from the cutting device to the winding needle.

5. The winding device according to claim 4, characterized in that The bracket includes two connecting rollers arranged in parallel, and the conveyor belt is wound on the two connecting rollers; the winding device includes a power component connected to at least one of the connecting rollers, and the power component drives at least one of the connecting rollers to rotate, thereby driving the conveyor belt to rotate.

6. The winding device according to claim 4 or 5, characterized in that The dust removal device comprises a dust suction pipe arranged on the bracket, and the dust suction pipe is communicated with the negative pressure chamber.

7. The winding device according to any one of claims 1 to 6, characterized in that: There are two cutting devices, one of which is used to cut the first pole piece, and the other is used to cut the second pole piece, the pole piece includes the first pole piece and the second pole piece, and the polarities of the first pole piece and the second pole piece are opposite; There are two dust removal devices in number and they correspond one to one with the cutting devices, wherein one of the dust removal devices is used to remove foreign matter from the first pole piece, and the other dust removal device is used to remove foreign matter from the second pole piece.

8. The winding device according to claim 7, characterized in that The winding device includes a detection device arranged on one side of the winding needle, and the detection device is used to detect the relative position of the first pole piece and the second pole piece.

9. The winding device according to claim 8, characterized in that The winding device also includes a driving device, which is connected to the dust removal device. When the detection device detects that the first pole piece and the second pole piece are offset from each other, the driving device can drive the dust removal device to move.

10. The winding device according to any one of claims 1 to 9, characterized in that: The winding device comprises a conveying device arranged between the dust removal device and the cutting device, and the conveying device is used to convey the pole piece to the winding needle.

11. The winding device according to claim 10, characterized in that The conveying device comprises two clamping rollers arranged opposite to each other, and the two clamping rollers clamp the pole piece together.

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