Rolling device, pole piece processing equipment, pole piece and battery
By setting a conveyor belt stretching section on the conveyor roller of the rolling device, the problem of uneven stretching in the tab area is solved, and uniform stretching and efficient production of the electrode sheet are achieved.
Patent Information
- Application Number
- CN202423247688.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During battery production, uneven stretching of the tab area during rolling can cause wrinkles and warping at the foil edges, creating stress concentration points. In severe cases, this can lead to strip breakage, affecting product yield and production efficiency.
A conveyor belt is installed on the conveyor roller of the roller pressing device. The surface of the conveyor belt has a stretching part for stretching the electrode tabs, releasing internal stress, and improving the uniformity of stretching.
By continuously releasing the internal stress of the tabs through the tension section on the conveyor belt, belt breakage is reduced, product yield and production efficiency are improved, and costs are reduced.
Smart Images
Figure CN223680128U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and in particular to a rolling device, electrode processing equipment, electrode, and battery. Background Technology
[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.
[0003] Currently, in battery production, especially during the rolling process of high-area-density and high-compact continuous-coated positive electrode sheets, the tab areas at both ends of the electrode sheet exhibit uneven extensibility under rolling pressure. Due to the uneven pressure distribution during rolling, the foil at the tabs stretches unevenly, making the foil edges prone to wrinkles and warping. This further leads to stress concentration points in the foil edge areas. Under continuous rolling pressure, these stress concentration points develop into cracks, and in severe cases, cause foil breakage, affecting the yield of rolled products and reducing production efficiency.
[0004] In traditional technology, a pressing mechanism is set above the electrode tab or a protrusion is set on the conveyor roller to abut the electrode tab, thereby releasing the internal stress of the electrode tab.
[0005] However, the above structure only acts at one or more points in the electrode conveying direction, resulting in an insignificant stretching effect, poor elongation uniformity, and modifications to the rolling equipment, which greatly increases the cost. Utility Model Content
[0006] Therefore, it is necessary to provide a rolling device, electrode processing equipment, electrode, and battery to continuously release the internal stress of the tabs, improve the uniformity of stretching, reduce the occurrence of strip breakage, improve the product yield, improve the production efficiency of electrode, and reduce costs.
[0007] The first aspect of this application provides a rolling device, which includes: a rolling mechanism for rolling electrode sheets; and a conveying and stretching mechanism disposed upstream of the rolling mechanism along the conveying direction of the electrode sheets. The conveying and stretching mechanism includes conveying rollers spaced apart and a conveyor belt disposed on the surface of at least two conveying rollers. The surface of the conveyor belt is provided with a stretching portion for stretching the tabs of the electrode sheets.
[0008] In some embodiments, the electrode includes a coating area and a tab, the tab being connected to the coating area, and a stretching portion being disposed corresponding to the tab and fitting against the edge of the coating area.
[0009] In some embodiments, the width of the stretching portion is greater than or equal to the width of the tab.
[0010] In some embodiments, the width W1 of the stretching part and the width W2 of the tab satisfy: 1mm≤W1-W2≤2mm.
[0011] In some embodiments, the stretching part is provided with a chamfer or a round corner near the edge of the coating area.
[0012] In some embodiments, there are two stretching parts, and the two stretching parts are respectively arranged corresponding to the tabs at the two ends of the tab sheet.
[0013] In some embodiments, the height of the stretching part protruding from the conveying belt is 3mm-5mm.
[0014] The second aspect of the present application provides a tab sheet processing equipment, which comprises the roller pressing device provided in the first aspect.
[0015] The third aspect of the present application provides a tab sheet, which is processed by the tab sheet processing equipment provided in the second aspect, and comprises: a coating area; a tab connected to the coating area, and the tab is arranged corresponding to the stretching part.
[0016] The fourth aspect of the present application provides a battery, which comprises the tab sheet provided in the third aspect.
[0017] Compared with the conventional technology, the present application has at least the following beneficial effects:
[0018] The roller pressing device provided in the present application is provided with a conveying belt on the surface of the conveying roller upstream of the roller pressing mechanism, and the surface of the conveying belt is provided with a stretching part for stretching the tab of the tab sheet. On the one hand, when the tab sheet passes through the conveying belt, the stretching part can continuously stretch the tab, thereby continuously releasing the internal stress of the tab. Compared with the structure of single-point or multi-point action in the conventional technology, the stretching part on the conveying belt improves the uniformity of the extension of the tab sheet, reduces the occurrence of the broken belt, improves the yield of the product, and improves the production efficiency of the tab sheet. On the other hand, no additional modification is needed for the roller pressing device itself, only the conveying belt with the stretching part needs to be fixed on the roller pressing device, and the conveying belt and the stretching part on the surface thereof can be flexibly designed according to the needs, thereby greatly reducing the cost. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 FIG. 1 is a structural schematic view of the roller pressing device in an embodiment of the present application.
[0020] REFERENCE SIGNS
[0021] 1. roller pressing device;
[0022] 10. roller pressing mechanism; 11. compression roller;
[0023] 20, transfer stretching mechanism; 21, transfer roller; 22, transfer belt; 221, stretching section. DETAILED DESCRIPTION
[0024] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways without some of the specific details described herein, and it is understood that similar improvements and modifications can be made without departing from the spirit and scope of the present application. It is also understood that the present application will include all such improvements and modifications.
[0025] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0026] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0027] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0028] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.
[0029] It should be noted that if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.
[0030] If not specifically stated, the terms "comprising" and "including" mentioned in the present application are open-ended and can also be closed. For example, the terms "comprising" and "including" can mean that other components not listed can also be included or can only include the listed components.
[0031] If not specifically stated, in the present application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any one of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).
[0032] In combination Figure 1 As shown, the first aspect of the present application provides a rolling device 1, which comprises a rolling mechanism 10 and a conveying and stretching mechanism 20. The rolling mechanism 10 is used to roll the pole piece. The conveying and stretching mechanism 20 is arranged upstream of the rolling mechanism 10 along the conveying direction of the pole piece, and the conveying and stretching mechanism 20 comprises conveying rollers 21 arranged at intervals and a conveying belt 22 arranged on the surfaces of at least two conveying rollers 21. The surface of the conveying belt 22 is convexly provided with stretching portions 221, which are used to stretch the pole lug of the pole piece.
[0033] The roller pressing device 1 provided in the application is characterized in that a conveying belt 22 is arranged on the surface of the conveying roller 21 upstream of the roller pressing mechanism 10 in the roller pressing device 1, and the surface of the conveying belt 22 is provided with a stretching part 221 for stretching the tab of the pole piece. On the one hand, when the pole piece passes through the conveying belt 22, the stretching part 221 can continuously stretch the tab, thereby continuously releasing the internal stress of the tab. Compared with the structure of single-point or multi-point action in the prior art, the stretching part 221 on the conveying belt 22 improves the uniformity of the extension of the pole piece, reduces the occurrence of the broken belt, improves the yield of the product, and improves the production efficiency of the pole piece. On the other hand, no additional modification is needed for the roller pressing device 1 itself, and only the conveying belt 22 with the stretching part 221 needs to be fixed on the roller pressing device 1. Moreover, the conveying belt 22 and the stretching part 221 on the surface thereof can be flexibly designed according to the requirement, thereby greatly reducing the cost.
[0034] It can be understood that the conveying and stretching mechanism 20 provided in the application is located upstream of the roller pressing mechanism 10 and pre-stretches the tab of the pole piece to release the internal stress of the tab, thereby ensuring the flatness of the pole piece after the roller pressing, reducing the tab folding and the pole piece breaking phenomenon, and improving the yield of the product.
[0035] In some specific embodiments, the material of the conveying belt 22 is polyethylene terephthalate film (PET), and the material of the stretching part 221 is Teflon or foam.
[0036] In some embodiments, the pole piece includes a coated area and a tab, the tab is connected to the coated area, the stretching part 221 is arranged corresponding to the tab and is attached to the edge of the coated area.
[0037] The pole piece includes a substrate (also referred to as a foil), the substrate includes a tab area and a coated area for coating an active material layer, and the tab area and the coated area are alternately distributed in the width direction of the substrate. In the production process of the pole piece, the substrate is usually wound into a roll form for movement between processes.
[0038] In the production process of the battery, the pole piece usually needs to be roller pressed to improve the compaction density of the pole piece, thereby improving the energy density of the battery. In the process of roller pressing the pole piece, since the thickness of the coated area is greater than the thickness of the tab area, the coated area is mainly roller pressed during the roller pressing of the pole piece, the coated area is stretched due to the roller pressing, and the tab area is almost not elongated due to the lack of roller pressing. This will cause the elongation rates of different areas of the substrate to be different, thereby causing the tab area to fold.
[0039] In the embodiments of the application, the stretching part 221 is arranged corresponding to the tab and is attached to the edge of the coated area, thereby realizing the pre-stretching of the tab by the stretching part 221 and releasing the internal stress of the tab. Thus, the uniformity of the extension of different areas of the pole piece in the subsequent roller pressing process is ensured, and the occurrence of the broken belt is reduced.
[0040] In some embodiments, the width of the stretching portion 221 is greater than or equal to the width of the tab. In this way, the stretching portion 221 completely covers the tab, ensuring that each part of the tab is subjected to uniform stretching force during stretching, further improving the uniformity of the extension of the tab.
[0041] In some embodiments, the width W1 of the stretching portion 221 and the width W2 of the tab satisfy: 1mm≤W1-W2≤2mm. Exemplarily, the value of W1-W2 can be, but is not limited to, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm. In this way, the width of the stretching portion 221 is set to be slightly larger than the width of the tab, which can not only ensure the uniformity of the extension of the stretching, but also reduce material waste.
[0042] In some embodiments, the stretching portion 221 is provided with a chamfer or a round corner near the edge of the coating area. In this way, the stretching portion 221 is provided with a chamfer or a round corner near the edge of the coating area, which can reduce the hanging material problem of the stretching portion 221 near the edge of the coating area, thereby improving the surface flatness of the tab, preventing the tab from wrinkling and the belt from breaking due to uneven tension in the subsequent rolling process, and improving the product yield and production efficiency.
[0043] In some embodiments, the rolling device 1 further comprises a slitting mechanism. The slitting mechanism is arranged upstream of the conveying stretching mechanism 20 along the conveying direction of the tab, and is used to slit the tab so that the tabs are located at both ends of the tab. When part of the tab is arranged in the middle of the tab, the tab is stretched, and the tab in the middle position of the tab is easily interfered by the two sides due to the release of stress, forming interference lines. In this way, the slitting mechanism is used to slit the tab first, reducing the generation of interference lines, further improving the uniformity of the extension of the tab, reducing the occurrence of belt breaking, improving the yield of the product, and improving the production efficiency of the tab.
[0044] In some embodiments, the stretching portion 221 is two, and the two stretching portions 221 are respectively arranged corresponding to the tabs at both ends of the tab. In this way, the stretching portion 221 simultaneously stretches the tabs at both ends of the tab, further improving the uniformity of the extension of the tab, reducing the occurrence of belt breaking, improving the yield of the product, and improving the production efficiency of the tab.
[0045] In some embodiments, the stretch portion 221 protrudes the height of the conveying belt 22 by 3-5 mm. For example, the stretch portion 221 can protrude the height of the conveying belt 22 by 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, or 5 mm, but is not limited thereto. Within the above height range, the stretch portion 221 abuts against the tab to stretch the tab, ensuring that the tab is stretched within a proper range, further improving the uniformity of the tab, reducing the occurrence of broken belts, improving the yield of the product, and improving the production efficiency of the tab.
[0046] In some embodiments, the rolling mechanism 10 includes a pair of pressure rollers 11 that form a gap for the tab to pass through, and the pair of pressure rollers 11 are configured to roll the tab. In this way, by arranging the pair of pressure rollers 11 to form a gap for the tab to pass through, effective rolling of the tab is achieved, improving the flatness and quality of the tab, while reducing the energy consumption and wear during rolling.
[0047] The second aspect of the present application provides a tab processing device, which includes the rolling device 1 provided in the first aspect.
[0048] The tab processing device provided in the present application improves the yield of the tab and the production efficiency of the product, due to the rolling device 1 provided in the first aspect.
[0049] The third aspect of the present application provides a tab, which is processed by the tab processing device provided in the second aspect, and includes a coated area and a tab. The tab is connected to the coated area, and the tab is arranged corresponding to the stretch portion 221.
[0050] Specifically, the tab can be a positive tab or a negative tab. Correspondingly, the tab can be a positive tab or a negative tab.
[0051] The battery provided in the embodiments of the present application has the same technical effects as the tab processing device provided in the second aspect, and thus will not be described herein.
[0052] The fourth aspect of the present application provides a battery, which includes the tab provided in the third aspect.
[0053] The battery provided in the embodiments of the present application has the same technical effects as the tab provided in the third aspect, and thus will not be described herein.
[0054] Specifically, the battery includes one or more battery monomers, and the battery monomer includes the tab.
[0055] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cells.
[0056] The battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. The battery can be a battery pack, and the battery pack includes a box and battery cells, and the battery cells or battery modules are contained in the box. In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and longitudinal beam of the vehicle. In other embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.
[0057] The battery provided by the embodiments of the present application can be used to provide power for an electric device. The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.
[0058] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.
[0059] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the technical concept of the present application, some modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A roller press device, characterized by, The application relates to a rolling device for rolling a pole piece, comprising: a rolling mechanism for rolling the pole piece; and a conveying and stretching mechanism arranged upstream of the rolling mechanism along the conveying direction of the pole piece, the conveying and stretching mechanism comprising conveying rollers arranged at intervals and a conveying belt arranged on the surfaces of at least two of the conveying rollers, the surface of the conveying belt being provided with stretching portions for stretching the pole tabs of the pole piece. The pole piece comprises a coated area and a pole tab connected to the coated area, the stretching portions are arranged corresponding to the pole tabs and are in contact with the edges of the coated area.
2. The roller press device of claim 1, wherein, The width of the stretching portions is greater than or equal to the width of the pole tabs.
3. The roller press device of claim 2, wherein, The width W1 of the stretching portions and the width W2 of the pole tabs satisfy the following relationship: 1mm<=W1-W2<=2mm.
4. The roller press apparatus of claim 3, wherein The stretching portions are provided with chamfers or round corners near the edges of the coated area.
5. The roller press apparatus of claim 2, wherein The stretching portions are two, and the two stretching portions are arranged corresponding to the pole tabs at the two ends of the pole piece respectively.
6. The roller press device according to any one of claims 1 to 5, characterized in that, The height of the stretching portions protruding from the conveying belt is 3mm-5mm.
7. The roller press device according to any one of claims 1 to 5, characterized in that, The application further relates to a pole piece processing device comprising the rolling device as claimed in any one of claims 1-7.
8. A pole piece processing apparatus characterized by, The pole piece processed by the pole piece processing device as claimed in claim 8 comprises:
9. A pole piece characterized by, a coated area; a pole tab connected to the coated area, the pole tab being arranged corresponding to the stretching portions. The application further relates to a pole piece comprising the pole piece as claimed in claim 9.
10. A battery, characterized by