A blanking device for an electrode assembly and a blanking system

Abstract

The application relates to the field of discharging devices, and discloses a discharging device for an electrode assembly and a discharging system, which comprises a device body, a roller, which is located on one side of the device body in a first direction, extends in a second direction, is rotatably arranged on the device body and is used for contacting the electrode assembly, and a support structure, which is located between the device body and the roller in the first direction and is fixed to the device body, and a support end surface of the support structure, which faces away from the device body, is in contact with a side wall of the roller. Thus, in the discharging process, the risk of the free movement of the pole piece and the isolation film of the electrode assembly being limited by the discharging device is reduced, the risk of the pole piece and the isolation film of the electrode assembly being accumulated is reduced, the risk of the electrode assembly being wrinkled is reduced, the support structure can support the roller, the deformation amount of the roller is reduced, the uniformity of the pole piece in the flattening process is facilitated, and the production quality of the battery assembly is improved.

Description

Technical Field

[0001] This application relates to the field of feeding devices, and more particularly to a feeding device for electrode assemblies and a feeding system having the feeding device. Background Technology

[0002] In related technologies, an electrode assembly is set inside the battery cell. During the manufacturing process of the electrode assembly, the anode electrode, separator, and cathode electrode are wound together by actively rotating a winding needle to form the electrode assembly. The electrode assembly has internal stress that adheres to the winding needle. During the unloading process of the electrode assembly, the electrode and separator are subjected to their own stress, causing them to move inward. Due to the randomness of this movement, some areas of the electrode and separator may accumulate after the electrode assembly is removed from the forming fixture.

[0003] Currently, a clamping and unloading mechanism is used to unload electrode components. The clamping and unloading mechanism holds the electrode components, and the contact position between the clamping and unloading mechanism and the electrode components is fixed with no relative movement. The clamping and unloading mechanism restricts the free movement of the electrode sheets and separators, resulting in the electrode components being unable to move in their stacked position. The electrode sheets and separators cannot adjust their positions according to the tension, which causes wrinkles to appear on the inner ring of the electrode components, affecting the production quality of the battery components. Summary of the Invention

[0004] This application aims to at least address one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a feeding device for electrode assemblies that reduces the risk of wrinkles in the electrode assemblies, thereby improving the production quality of battery assemblies.

[0005] This application also proposes a feeding system.

[0006] In a first aspect, embodiments of this application provide a feeding device for electrode assemblies, comprising:

[0007] device body;

[0008] A roller is located on one side of the device body along a first direction and extends along a second direction. The roller is rotatably disposed on the device body about the second direction and is used to contact the electrode assembly. The first direction and the second direction intersect.

[0009] The support structure, along the first direction, is located between the device body and the roller and is fixed to the device body. The support end face of the support structure away from the device body contacts the side wall of the roller.

[0010] In the above technical solution, during the feeding process, the feeding device passes through the winding hole in the middle of the electrode assembly. The roller contacts the electrode assembly. Since the roller can rotate in the second direction, it can counteract the tension generated by the stress release of the electrode assembly by rolling. This reduces the risk of the feeding device restricting the free movement of the electrode sheet and separator of the electrode assembly, ensuring that the electrode sheet and separator are evenly distributed during the stretching process. This reduces the risk of electrode sheet and separator accumulation, thereby reducing the risk of wrinkles in the electrode assembly. Furthermore, the support structure can support the roller, reducing the amount of roller deformation. This is beneficial for reliable roller rolling and reliable contact between the roller and the battery assembly, which is beneficial for the uniformity of the electrode sheet during the smoothing process, and thus helps to improve the production quality of the battery assembly.

[0011] In some embodiments, the support end face and the central axis of the roller are opposite each other along a first direction.

[0012] In the above technical solution, by setting the support end face and the central axis of the roller relative to each other along the first direction, the support structure can reliably support the roller, enabling the roller to rotate smoothly. This is beneficial for improving the rigidity of the roller, further reducing the amount of roller deformation, and further improving the parallelism of the roller. This is more conducive to maintaining the uniformity of the electrode assembly during the smoothing process. In addition, the roller diameter can be further reduced. During the process of the feeding device clamping the electrode assembly, the risk of mismatch between the lengths on both sides of the electrode assembly is further reduced, and the consistency of the lengths on both sides of the electrode assembly is further improved. After the electrode assembly is shaped (such as by hot pressing), the pulling of the short side and the compression of the long side of the electrode assembly are further reduced, and the redundancy of the electrode assembly is further reduced.

[0013] In some embodiments, the support end face extends along the second direction to the edge of the roller.

[0014] In the above technical solution, by extending the end of the support end face along the second direction to the corresponding edge position of the roller, it is beneficial to increase the setting length of the support end face along the second direction, which can increase the contact area between the support structure and the roller, improve the support effect of the support structure on the roller, thereby further reducing the amount of roller deformation, which is more conducive to improving the parallelism of the roller, and further reducing the redundancy of the electrode assembly.

[0015] In some embodiments, the support structure is constructed as a support plate.

[0016] In the above technical solution, constructing the support structure as a support plate structure simplifies the structure of the support structure and facilitates its production and manufacturing, thereby improving the production efficiency of the feeding device.

[0017] In some embodiments, the first direction and the second direction are perpendicular.

[0018] In the above technical solution, the perpendicularity of the first and second directions facilitates the manufacturing of the feeding device and is more conducive to improving the production efficiency of the feeding device.

[0019] In some embodiments, the device body has two mounting portions on one side of the roller, the two mounting portions are opposite to each other and spaced apart along a second direction, and the roller is located between the two mounting portions and is rotatably disposed on the mounting portion.

[0020] In the above technical solution, by setting two mounting parts, the roller can be rotatably mounted on the device body. When the roller contacts the two mounting parts, the two mounting parts can limit the roller in the second direction, reducing the risk of the roller moving in the second direction, further improving the consistency of the length on both sides of the electrode assembly. After the electrode assembly is shaped, the electrode assembly is further reduced by the pulling of the short side and the compression of the long side, further reducing the redundancy of the electrode assembly.

[0021] In some embodiments, the feeding device further includes: a limiting part, wherein the limiting part is provided on one side of the device body where the roller is provided, and at least one side of the roller is provided along a third direction, the limiting part and the side wall of the roller are in contact and limited, and along a first direction, a portion of the roller protrudes from the limiting part in a direction away from the device body, and the third direction is perpendicular to both the first direction and the second direction.

[0022] In the above technical solution, the limiting part contacts and limits the roller's surface facing the roller and the roller's sidewall, which can restrict the roller's displacement in a third direction and further reduce the risk of roller deformation. This also reduces the risk of roller displacement due to uneven force during rotation, thus facilitating the roller's rotation along a predetermined path and improving the stability and reliability of the feeding device. Furthermore, by simultaneously limiting the roller through the limiting part and the support structure, the parallelism of the roller is further improved, further reducing the risk of roller bending. A portion of the roller's structure protrudes from the limiting part in the direction away from the device body, allowing the roller to contact the electrode assembly and maintain the working performance of the feeding device.

[0023] In some embodiments, the limiting portion is fixed to the device body.

[0024] In the above technical solution, by fixing the limiting part to the device body, the risk of separation between the limiting part and the roller is reduced, the positional stability of the limiting part can be improved, the limiting part and the roller can reliably contact and limit, further reducing the risk of roller offset, improving the stability and consistency of the feeding device in clamping the electrode assembly, and reducing the risk of poor smoothing effect of the electrode assembly due to roller offset.

[0025] In some embodiments, the limiting part includes a connecting structure and a limiting structure, the connecting structure being connected between the limiting structure and the device body, the limiting structure and the connecting structure being bent together, and the limiting structure being bent toward the roller side so that the limiting structure and the sidewall of the roller contact and limit each other.

[0026] In the above technical solution, by bending the limiting structure relative to the connecting structure toward the roller side, the surface of the limiting structure facing the roller and the roller are limited. The limiting structure can restrict the roller from moving away from the device body and deforming, further reducing the risk of poor smoothing effect of the electrode assembly due to roller offset.

[0027] Secondly, embodiments of this application provide a feeding system, including the above-described feeding device for electrode assemblies.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a top view of the feeding device according to an embodiment of this application;

[0031] Figure 2 yes Figure 1 Cross-sectional view at point AA;

[0032] Figure 3 This is a side view of the feeding device according to an embodiment of this application;

[0033] Figure 4 This is a front view of the feeding device according to an embodiment of this application;

[0034] Figure 5 This is a schematic diagram illustrating the cooperation between the feeding device and the electrode assembly according to an embodiment of this application;

[0035] Figure 6 This is a top view of the feeding device and electrode assembly assembled according to an embodiment of this application.

[0036] Figure label:

[0037] Feeding device 100;

[0038] Device body 10; mounting part 11;

[0039] 20 rollers;

[0040] Support structure 30; Support end face 31;

[0041] Limiting part 40; connecting structure 41; limiting structure 42;

[0042] Electrode assembly 200; central winding hole 201. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B and / or C can represent: B existing alone, B and C existing simultaneously, or C existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0049] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0050] In this application, "multiple" means two or more (including two).

[0051] The battery cell mentioned in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0052] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0053] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0054] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator wound together. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes from the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes from the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.

[0055] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0056] In recent years, the vehicle industry has developed rapidly. Taking new energy vehicles as an example, battery cells, as the core component of vehicles, play an irreplaceable and important role.

[0057] In related technologies, an electrode assembly is set inside the battery cell. During the manufacturing process of the electrode assembly, the anode electrode, separator, and cathode electrode are wound together by actively rotating a winding needle to form the electrode assembly. The electrode assembly has internal stress that adheres to the winding needle. During the unloading process of the electrode assembly, the electrode and separator are subjected to their own stress, causing them to move inward. Due to the randomness of this movement, some areas of the electrode and separator may accumulate after the electrode assembly is removed from the forming fixture.

[0058] Currently, a clamping and unloading mechanism is used to unload electrode components. The clamping and unloading mechanism holds the electrode components, and the contact position between the clamping and unloading mechanism and the electrode components is fixed without relative movement. The clamping and unloading mechanism restricts the free movement of the electrode sheets and separators, resulting in the electrode components being unable to move in their stacked position. The electrode sheets and separators cannot adjust their positions according to the tension, which causes wrinkles in the electrode components and affects the production quality of the battery components.

[0059] Based on the above considerations, in order to solve the problem of wrinkles in electrode assemblies, a feeding device for electrode assemblies was designed after in-depth research, including: a device body; a roller along a first direction, the roller is located on one side of the device body, the roller extends along a second direction, the roller is rotatably disposed on the device body around the second direction, the roller is used to contact the electrode assembly, the first direction and the second direction intersect; a support structure along the first direction, the support structure is located between the device body and the roller and is fixed to the device body, the support end face of the support structure opposite to the device body contacts the side wall of the roller. During the feeding process, the feeding device passes through the winding hole in the middle of the electrode assembly. The roller contacts the electrode assembly. Since the roller can rotate in a second direction, it can counteract the tension generated by the stress release of the electrode assembly by rolling. This reduces the risk of the feeding device restricting the free movement of the electrode sheet and separator of the electrode assembly, ensuring that the electrode sheet and separator are evenly distributed during the stretching process. This reduces the risk of electrode sheet and separator accumulation and thus reduces the risk of wrinkles in the electrode assembly. Furthermore, the support structure can support the roller, reducing the amount of roller deformation. This is beneficial for reliable roller rolling and reliable contact between the roller and the battery assembly, which in turn improves the uniformity of the electrode sheet during the smoothing process and ultimately improves the production quality of the battery assembly.

[0060] The following is for reference. Figures 1-6 This application describes a feeding device 100 for an electrode assembly 200 according to an embodiment of the present application.

[0061] like Figures 1-6 As shown, the feeding device 100 according to an embodiment of this application includes: a device body 10; a roller 20, which is located on one side of the device body 10 along a first direction and extends along a second direction, and is rotatably disposed on the device body 10 about the second direction, and is used to contact the electrode assembly 200, wherein the first direction and the second direction intersect; and a support structure 30, which is located between the device body 10 and the roller 20 and fixed to the device body 10 along the first direction, wherein the support end face 31 of the support structure 30 away from the device body 10 contacts the side wall of the roller 20.

[0062] The feeding device 100 includes a device body 10, a roller 20, and a support structure 30. The device body 10 can be made of metal materials, such as stainless steel, aluminum, or iron. However, this application is not limited to this; the device body 10 can also be made of non-metallic materials, as long as the device body 10 has sufficient strength and rigidity.

[0063] like Figure 2 As shown, the feeding device 100 is... Figure 2 When placed in the center direction, the first direction is Figure 2 The first direction is the X direction. Along the first direction, the roller 20 is disposed on one side of the device body 10. The roller 20 extends along the second direction, where the first and second directions intersect. An acute or obtuse angle can be formed between the first and second directions, or they can be perpendicular. This application will illustrate this using the example of the first and second directions being perpendicular. Figure 1 As shown, the feeding device 100 is... Figure 1 When placed in the center direction, the second direction is Figure 1 in the Y direction.

[0064] The roller 20 is rotatably mounted on the device body 10 in a second direction. The roller 20 can be rotatably mounted on the device body 10 via a bearing or a rotating shaft. However, this application is not limited to these methods. The assembly method of the roller 20 and the device body 10 is not specifically limited, as long as the roller 20 is rotatably mounted on the device body 10.

[0065] like Figure 5As shown, the electrode assembly 200 has a central winding hole 201. During the unloading process, the unloading device 100 passes through the central winding hole 201, and the roller 20 contacts the electrode assembly 200. During the unloading process of the electrode assembly 200, the contact between the roller 20 and the electrode assembly 200 allows the electrode assembly 200 to maintain a certain degree of freedom during clamping. Due to the release of internal stress, the electrode assembly 200 will have an inward shrinkage tendency. The electrode sheets and separators in the redundant part (i.e., the wrinkled part) of the electrode assembly 200 will be displaced due to tension. The rotation of the roller 20 relative to the device body 10 can provide a smooth path for the movement of the electrode sheets and separators, allowing the electrode sheets and separators in the redundant part (i.e., the wrinkled part) of the electrode assembly 200 to move freely and redistribute, thereby reducing the risk of wrinkling in the electrode assembly 200, improving the redundancy problem of the electrode assembly 200, and helping to improve the production quality of the electrode assembly 200.

[0066] like Figure 2 As shown, along the first direction, the support structure 30 is located between the device body 10 and the roller 20, and the support structure 30 is fixed to the device body 10. As one example, the support structure 30 and the device body 10 are integrally formed so that the support structure 30 is fixed to the device body 10. As another example, the support structure 30 is fixed to the device body 10 by bolts. As yet another example, the support structure 30 is snap-fitted to the device body 10. By fixing the support structure 30 to the device body 10, the risk of the support structure 30 falling off the device body 10 is reduced, thereby ensuring that the support structure 30 reliably supports the roller 20.

[0067] Along the first direction, the end face of the support structure 30 facing away from the device body 10 is the support end face 31. The support end face 31 contacts the side wall of the roller 20, thereby supporting the roller 20 during its rotation. By providing the support structure 30, the support structure 30 supports the roller 20 during its rotation, reducing the risk of deformation during rotation and improving the parallelism of the roller 20, thus helping to maintain the uniformity of the electrode assembly 200 during the smoothing process. Furthermore, by supporting the roller 20, the support structure 30 can reduce the diameter of the roller 20, increasing the sharpness of the feeding device 100. During the feeding device 100's gripping of the electrode assembly 200, the risk of mismatched lengths on both sides of the electrode assembly 200 is reduced, improving the consistency of lengths on both sides of the electrode assembly 200. After the electrode assembly 200 is shaped (e.g., hot-pressed), the pulling of the short side and the compression of the long side are reduced, further reducing redundancy in the electrode assembly 200.

[0068] The roller 20 can be made of a highly wear-resistant material, and its surface can be coated with Teflon to reduce the coefficient of friction. The diameter of the roller 20 is optimized to effectively smooth the electrode assembly 200. The support structure 30 can be made of Teflon, giving it good wear resistance and self-lubricating properties. The support structure 30 is fixed to the device body 10, providing frontal support for the roller 20 while reducing the impact of excessive friction on the rolling effect of the roller 20.

[0069] In the above technical solution, during the feeding process, the feeding device 100 passes through the winding hole 201 in the middle of the electrode assembly 200. The roller 20 contacts the electrode assembly 200. Since the roller 20 can rotate around the second direction, the roller 20 can counteract the tension generated by the stress release of the electrode assembly 200 by rolling, reducing the risk of the feeding device 100 restricting the free movement of the electrode sheet and separator of the electrode assembly 200. This ensures that the electrode sheet and separator are evenly distributed during the stretching process, reducing the risk of electrode sheet and separator accumulation in the electrode assembly 200, thereby reducing the risk of wrinkles in the electrode assembly 200. Furthermore, the support structure 30 can support the roller 20, reducing the deformation of the roller 20, which is beneficial for the reliable rolling of the roller 20 and for the reliable contact between the roller 20 and the battery assembly. This is beneficial for the uniformity of the electrode sheet during the smoothing process, and thus helps to improve the production quality of the battery assembly.

[0070] According to some embodiments of this application, such as Figure 2 As shown, the central axes of the support end face 31 and the roller 20 are opposite each other along the first direction.

[0071] The central axis of the roller 20 extends along the second direction, and the central axis of the roller 20 and the support end face 31 are directly opposite each other along the first direction.

[0072] In the above technical solution, by setting the support end face 31 and the central axis of the roller 20 opposite each other along the first direction, the support structure 30 can reliably support the roller 20, allowing the roller 20 to rotate smoothly. This is beneficial for improving the rigidity of the roller 20, further reducing the deformation of the roller 20, and further improving the parallelism of the roller 20. This is more conducive to maintaining the uniformity of the electrode assembly 200 during the smoothing process. In addition, the diameter of the roller 20 can be further reduced. During the process of the feeding device 100 clamping the electrode assembly 200, the risk of mismatch in length on both sides of the electrode assembly 200 is further reduced, and the consistency of length on both sides of the electrode assembly 200 is further improved. After the electrode assembly 200 is shaped (e.g., hot-pressed), the pulling of the short side and the compression of the long side of the electrode assembly 200 are further reduced, and the redundancy of the electrode assembly 200 is further reduced.

[0073] According to some embodiments of this application, the support end face 31 extends along a second direction to the edge of the roller 20.

[0074] The support end face 31 extends along the second direction. One end of the support end face 31 extends to the corresponding edge position of the roller 20 along the second direction, or both ends of the support end face 31 extend to the two corresponding edge positions of the roller 20 respectively. This application will use the example of the support end face 31 extending to the two corresponding edge positions of the roller 20 respectively along the second direction for illustration.

[0075] In the above technical solution, by extending the end of the support end face 31 along the second direction to the corresponding edge position of the roller 20, it is beneficial to increase the setting length of the support end face 31 along the second direction, which can increase the contact area between the support structure 30 and the roller 20, improve the support effect of the support structure 30 on the roller 20, thereby further reducing the deformation of the roller 20, which is more conducive to improving the parallelism of the roller 20, and further reducing the redundancy of the electrode assembly 200.

[0076] According to some embodiments of this application, the support structure 30 is constructed as a support plate.

[0077] Among them, such as Figure 2 As shown, the support structure 30 can be a flat plate structure, or the support structure 30 can be similar to a flat plate structure.

[0078] In the above technical solution, by constructing the support structure 30 as a support plate structure, it is beneficial to simplify the structure of the support structure 30 and facilitate the production and manufacturing of the support structure 30, thereby improving the production efficiency of the feeding device 100.

[0079] According to some embodiments of this application, the first direction and the second direction are perpendicular.

[0080] Among them, such as Figure 2 As shown, the feeding device 100 is... Figure 2 When placed in the center direction, the first direction is Figure 2 The X direction in the equation. For example... Figure 1 As shown, the feeding device 100 is... Figure 1 When placed in the center direction, the second direction is Figure 1 in the Y direction.

[0081] In the above technical solution, the perpendicularity of the first and second directions facilitates the production and manufacturing of the feeding device 100 and is more conducive to improving the production efficiency of the feeding device 100.

[0082] According to some embodiments of this application, the device body 10 has two mounting portions 11 on one side where the roller 20 is provided. The two mounting portions 11 are opposite to each other and spaced apart along a second direction. The roller 20 is located between the two mounting portions 11 and is rotatably disposed on the mounting portion 11.

[0083] Among them, such as Figures 1-4 As shown, along the first direction, the device body 10 has a mounting portion 11 on one side where the roller 20 is provided. There are two mounting portions 11, which are arranged opposite to each other along the second direction and spaced apart along the second direction. The roller 20 extends along the second direction and is located between the two mounting portions 11. The roller 20 is rotatably mounted on the two mounting portions 11. The roller 20 can be rotatably mounted on the two mounting portions 11 via bearings or via a rotating shaft.

[0084] In the above technical solution, by setting two mounting parts 11, the roller 20 is rotatably mounted on the device body 10. When the roller 20 contacts the two mounting parts 11, the two mounting parts 11 can limit the roller 20 in the second direction, reducing the risk of the roller 20 moving in the second direction, further improving the consistency of the length on both sides of the electrode assembly 200. After the electrode assembly 200 is shaped (e.g., hot-pressed), the pulling of the short side and the compression of the long side of the electrode assembly 200 are further reduced, further reducing the redundancy of the electrode assembly 200.

[0085] According to some embodiments of this application, the feeding device 100 further includes: a limiting part 40, the limiting part 40 is provided on one side of the device body 10 where the roller 20 is provided, the limiting part 40 is provided on at least one side of the roller 20 along a third direction, the limiting part 40 contacts and limits the side wall of the roller 20, and along a first direction, a portion of the roller 20 protrudes from the limiting part 40 in a direction away from the device body 10, the third direction is perpendicular to both the first direction and the second direction.

[0086] Among them, such as Figure 1 and Figure 2 As shown, the feeding device 100 may further include a limiting part 40. Along the first direction, the limiting part 40 is provided on the side of the device body 10 where the roller 20 is located, such as... Figure 2 As shown, the feeding device 100 is... Figure 2 When placed in the center direction, the third direction is... Figure 2In the Z direction. Along the third direction, a limiting part 40 is provided on one side of the roller 20, or both sides of the roller 20 are provided with limiting parts 40. This application will describe the roller 20 with limiting parts 40 on both sides along the third direction as an example. The limiting part 40 contacts and limits the surface of the roller 20 and the side wall of the roller 20, which can limit the roller 20 from shifting along the third direction and further reduce the risk of deformation of the roller 20. It also reduces the risk of the roller 20 shifting due to uneven force during rotation, thereby helping the roller 20 to rotate along a predetermined path, and thus improving the stability and reliability of the feeding device 100. Furthermore, by limiting the roller 20 simultaneously with the limiting part 40 and the support structure 30, it is more conducive to improving the parallelism of the roller 20 and further reducing the risk of the roller 20 bending. Along the first direction, a portion of the structure of the roller 20 protrudes from the limiting part 40 in the direction away from the device body 10, which can make the roller 20 and the electrode assembly 200 contact each other and maintain the working performance of the feeding device 100.

[0087] According to some embodiments of this application, the limiting part 40 is fixed to the device body 10.

[0088] Among them, such as Figure 2 As shown, the limiting part 40 can be integrally formed with the device body 10, the limiting part 40 can also be fixed to the device body 10 by snap-fit, and the limiting part 40 can also be fixed to the device body 10 by bolts.

[0089] In the above technical solution, by fixing the limiting part 40 to the device body 10, the risk of separation between the limiting part 40 and the roller 20 is reduced, the positional stability of the limiting part 40 is improved, and the limiting part 40 and the roller 20 can reliably contact and limit each other, further reducing the risk of roller 20 offset, improving the stability and consistency of the feeding device 100 in holding the electrode assembly 200, and reducing the risk of poor smoothing effect of the electrode assembly 200 due to roller 20 offset.

[0090] According to some embodiments of this application, the limiting part 40 includes a connecting structure 41 and a limiting structure 42. The connecting structure 41 is connected between the limiting structure 42 and the device body 10. The limiting structure 42 and the connecting structure 41 are bent together, and the limiting structure 42 is bent toward the roller 20 so that the limiting structure 42 and the side wall of the roller 20 are in contact and limited.

[0091] Among them, such as Figure 2As shown, the limiting part 40 may include a connecting structure 41 and a limiting structure 42, which are arranged along a first direction. The connecting structure 41 and the limiting structure 42 can be integrally formed. The connecting structure 41 is connected between the limiting structure 42 and the device body 10. The limiting structure 42 and the connecting structure 41 are bent together, and the limiting structure 42 is bent relative to the connecting structure 41 toward the roller 20 side, so that the surface of the limiting structure 42 facing the roller 20 and the side wall of the roller 20 are in contact and limited. It should be noted that, along the first direction, the central axis of the roller 20 is located between the end of the limiting structure 42 away from the connecting structure 41 and the device body 10.

[0092] In the above technical solution, by bending the limiting structure 42 relative to the connecting structure 41 toward the roller 20, the limiting structure 42 can be positioned on the surface of the roller 20 and the roller 20. The limiting structure 42 can restrict the roller 20 from moving and deforming away from the device body 10, further reducing the risk of poor smoothing effect of the electrode assembly 200 due to the offset of the roller 20.

[0093] The feeding system according to the embodiments of this application includes the feeding device 100 of the above embodiments. During the feeding process, the feeding device 100 passes through the winding hole 201 in the middle of the electrode assembly 200. The roller 20 contacts the electrode assembly 200. Since the roller 20 is rotatable about the second direction, the roller 20 can counteract the tension generated by the stress release of the electrode assembly 200 by rolling, reducing the risk of the feeding device 100 restricting the free movement of the electrode sheet and separator of the electrode assembly 200. This ensures that the electrode sheet and separator are evenly distributed during the stretching process, reducing the risk of electrode sheet and separator accumulation in the electrode assembly 200, thereby reducing the risk of wrinkles in the electrode assembly 200. Furthermore, the support structure 30 can support the roller 20, reducing the deformation of the roller 20, which is beneficial for the reliable rolling of the roller 20 and for the reliable contact between the roller 20 and the battery assembly. This is beneficial for the uniformity of the electrode sheet during the smoothing process, and thus helps to improve the production quality of the battery assembly.

[0094] According to some embodiments of this application, see Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, this application provides a feeding device 100, including: a device body 10, a roller 20, and a support structure 30. Along a first direction, the roller 20 is located on one side of the device body 10. The roller 20 extends along a second direction and is rotatably disposed on the device body 10 about the second direction. The roller 20 is used to contact an electrode assembly 200. The first and second directions are perpendicular. Along the first direction, the support structure 30 is located between the device body 10 and the roller 20 and is fixed to the device body 10. The support end face 31 of the support structure 30, facing away from the device body 10, contacts the side wall of the roller 20. The central axes of the support end face 31 and the roller 20 are opposite to each other along the first direction. The side of the device body 10 where the roller 20 is located has two mounting portions 11. The two mounting portions 11 are opposite to each other and spaced apart along the second direction. The roller 20 is located between the two mounting portions 11 and is rotatably disposed on the mounting portion 11. The feeding device 100 further includes: a limiting part 40, which is fixed to the device body 10. Two limiting parts 40 are provided on one side of the device body 10 where the roller 20 is located. Along a third direction, a limiting part 40 is provided on each side of the roller 20. The limiting part 40 contacts and limits the sidewall of the roller 20. Along a first direction, a portion of the roller 20 protrudes from the limiting part 40 in a direction away from the device body 10. The third direction is perpendicular to both the first and second directions. The limiting part 40 includes: a connecting structure 41 and a limiting structure 42. The connecting structure 41 connects the limiting structure 42 and the device body 10. The limiting structure 42 and the connecting structure 41 are bent together, and the limiting structure 42 is bent towards the roller 20 so that the limiting structure 42 contacts and limits the sidewall of the roller 20.

[0095] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0096] Other components and operations of the feeding system according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0097] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A feeding device for electrode assemblies, characterized in that, include: device body; A roller, along a first direction, is located on one side of the device body, the roller extends along a second direction, the roller is rotatably disposed on the device body about the second direction, the roller is used to contact the electrode assembly, and the first direction and the second direction intersect. A support structure is provided along the first direction, located between the device body and the roller and fixed to the device body, with the support end face of the support structure facing away from the device body contacting the side wall of the roller.

2. The feeding device for electrode assemblies according to claim 1, characterized in that, The support end face and the central axis of the roller are opposite each other along the first direction.

3. The feeding device for electrode assemblies according to claim 1, characterized in that, The support end face extends along the second direction to the edge of the roller.

4. The feeding device for electrode assemblies according to claim 1, characterized in that, The supporting structure is constructed as a support plate.

5. The feeding device for electrode assemblies according to claim 1, characterized in that, The first direction and the second direction are perpendicular.

6. The feeding device for electrode assemblies according to any one of claims 1-5, characterized in that, The device body has two mounting portions on one side of the roller, the two mounting portions are opposite to each other and spaced apart along the second direction, and the roller is located between the two mounting portions and is rotatably disposed on the mounting portion.

7. The feeding device for electrode assemblies according to claim 6, characterized in that, The feeding device further includes a limiting part, wherein the limiting part is provided on one side of the device body where the roller is located, and the limiting part is provided on at least one side of the roller along a third direction. The limiting part contacts and limits the side wall of the roller, and along the first direction, a portion of the roller protrudes from the limiting part in a direction away from the device body. The third direction is perpendicular to both the first direction and the second direction.

8. The feeding device for electrode assemblies according to claim 7, characterized in that, The limiting part is fixed to the device body.

9. The feeding device for electrode assemblies according to claim 7, characterized in that, The limiting part includes a connecting structure and a limiting structure. The connecting structure is connected between the limiting structure and the device body. The limiting structure and the connecting structure are bent together, and the limiting structure is bent toward the roller side so that the limiting structure and the side wall of the roller contact and limit the movement.

10. A feeding system, characterized in that, Includes a feeding device for electrode assemblies according to any one of claims 1-9.

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