Pole piece manufacturing equipment, battery pole piece, battery monomer, battery device and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses pole piece manufacturing equipment, a battery pole piece, a battery monomer, a battery device and a power utilization device. The pole piece manufacturing equipment comprises a conveying device, a coating device, a drying device and an ultrasonic shaping device. The conveying device is used for conveying a pole piece material belt, the coating device is used for coating slurry on a coating surface of a current collector of the pole piece material belt, the drying device is arranged at the downstream of the coating device in the conveying direction of the pole piece material belt, the drying device is used for drying the slurry on the current collector to form an active substance layer, and the ultrasonic shaping device is arranged at the downstream of the drying device. And the ultrasonic shaping device is used for shaping the thinned area of the active material layer, so that the roughness of the shaping surface of the thinned area is smaller than that of other parts of the thinned area. According to the technical scheme, the thinning size of the thinning area can be accurately controlled, an ideal thinning curve is obtained, and the influence of the shaping process on the pole piece material belt can be greatly reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an electrode manufacturing equipment, a battery electrode, a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the production process of battery electrodes, there is a design difference between the thickness of the coating film at the edge and the thickness at the center of the coating area, necessitating the thinning of the coating film at the edge. Related technologies employ laser processing for this thinning process, which is not only difficult to control but may also damage the electrode. Utility Model Content

[0004] In view of the above problems, this application provides an electrode manufacturing equipment that can more accurately control the thinning size of the thinning zone and eliminate thick edges, obtain a more ideal thinning curve, and greatly reduce the impact on the electrode.

[0005] In a first aspect, this application provides an electrode manufacturing apparatus, comprising a conveying device, a coating device, and a drying device. The conveying device conveys electrode strips, the coating device coats a slurry onto the coating surface of the current collector on the electrode strip, and a drying device is located downstream of the coating device in the conveying direction of the electrode strip. The drying device is used to dry the slurry on the current collector to form an active material layer. The electrode manufacturing apparatus further includes an ultrasonic shaping device, located downstream of the drying device in the conveying direction of the electrode strip. The ultrasonic shaping device is used to shape the thinned area of ​​the active material layer so that the roughness of the shaped surface of the thinned area is less than the roughness of the remaining parts of the thinned area.

[0006] In the technical solution of this application embodiment, by setting the electrode manufacturing equipment to include a conveying device, a coating device, a drying device and an ultrasonic shaping device, the coating and drying steps of the electrode strip can be completed by the conveying device, the coating device and the drying device, and the ultrasonic shaping device is used to shape the dried electrode strip, that is, to thin the thinning area of ​​the active material layer. This not only allows for more accurate control of the thinning size of the thinning area and the obtaining of a more ideal thinning curve, but also greatly reduces the impact of the shaping process on the electrode strip.

[0007] In some embodiments, the ultrasonic shaping device includes a shaping head having a grinding surface extending along the width direction of the electrode strip on one side facing the electrode strip. When the electrode strip moves relative to the shaping head along the conveying direction, the shaping head grinds the thinning area through the grinding surface to reduce the local thickness of the thinning area.

[0008] In the above technical solution, by setting the ultrasonic shaping device to include a shaping head, and when the electrode strip moves relative to the shaping head along the conveying direction, the grinding surface of the shaping head contacts the thinning area, so that the grinding surface can be used to thin the thinning area, so that the thinning area after grinding meets the design requirements.

[0009] In some specific embodiments, the size of the shaping head is greater than or equal to the size of the thinning zone in the width direction of the electrode strip.

[0010] If the dimension of the electrode strip in the width direction is greater than or equal to the dimension of the thinned area in the width direction of the electrode strip, then when the thinned area of ​​the electrode strip is shaped by the ultrasonic shaping device, the grinding surface can completely cover the thinned area. Thus, the thinned area is shaped once during the electrode strip conveying process, achieving all-round grinding. This reduces the number of times the ultrasonic shaping device shapes the electrode strip, or reduces the number of times or the length of the conveying device conveys the electrode strip. After the electrode strip is shaped by the ultrasonic shaping device, the possibility of local thick areas still existing in the thinned area is reduced.

[0011] In some examples, in a plane perpendicular to the width direction of the electrode strip, the projection of the running surface onto the plane is parallel to the projection of the coating surface onto the plane.

[0012] In the above technical solution, by setting the projection of the running surface on the plane to be parallel to the projection of the coating surface on the plane, the thinning area of ​​the running surface and the coating surface can be fully contacted to fully eliminate the thick edge of the thinning area, thereby obtaining a zero-thinning and thick-edge appearance.

[0013] In some examples, in a plane perpendicular to the width direction of the electrode strip, the distance between the projection of the running surface onto the plane and the projection of the coating surface onto the plane gradually increases or decreases along the conveying direction of the electrode strip.

[0014] In the above technical solution, by setting the grinding surface as a projection on a plane perpendicular to the width direction of the electrode strip, and the distance between the grinding surface and the coating surface on the same plane perpendicular to the width direction of the electrode strip gradually increasing or decreasing along the conveying direction of the electrode strip, the grinding surface and the coating surface are at a certain angle, which can improve the grinding effect on the thinned area.

[0015] In some specific examples, the projection of the running surface onto the plane and the projection of the coating surface onto the plane are set at a preset angle, wherein the preset angle is less than or equal to 15°.

[0016] In the above technical solution, by setting the projection of the grinding surface on the plane and the projection of the coating surface on the plane at an angle, and setting the preset angle to less than or equal to 15°, the grinding effect on the thinned area can be improved.

[0017] In some embodiments, in the width direction of the electrode strip, the running surface is at least partially a plane parallel to the coating surface, or the running surface is at least partially a plane or arc surface that gradually approaches the coating surface in a direction away from the main body region of the active material layer.

[0018] In the width direction of the electrode strip, by setting the grinding surface to be at least partially parallel to the coating surface, that is, by setting the grinding surface to be at least partially in parallel contact with the thinning area, when grinding the thinning area through the grinding surface, the thick edge on the thinning area can be removed by using the grinding surface, so that the electrode strip has zero thinning and no thick edge appearance; by setting the grinding surface to be at least partially a plane or arc surface that gradually approaches the coating surface in the direction away from the main area of ​​the active material layer, that is, the distance between the grinding surface and different positions of the thinning area is different, so that the grinding surface can be used to perform thinning treatment of different thicknesses at different positions of the thinning area.

[0019] In some embodiments, the running surface includes a plurality of extended surfaces arranged in the width direction of the electrode strip, the plurality of extended surfaces being parallel to the coating surface, and the perpendicular distance between the plurality of extended surfaces and the coating surface in the width direction of the electrode strip tending to decrease along the direction away from the main body region of the active material layer.

[0020] In the above technical solution, by setting the grinding surface to include multiple extension surfaces arranged in the width direction of the electrode strip and setting the multiple extension surfaces parallel to the coating surface, the multiple extension surfaces can contact the thinning area of ​​the electrode strip, thereby achieving sufficient grinding of the thinning area by the grinding surface; in the width direction of the electrode strip, by setting the vertical distance between the multiple extension surfaces and the coating surface to decrease in the direction away from the main area of ​​the active material layer, that is, the grinding surface is a gradient grinding surface. When the grinding surface contacts the thinning area, the extension surfaces of different gradients contact the thinning area at the corresponding position to achieve grinding of different thicknesses, thereby obtaining the required thinning curve.

[0021] In some examples, the running surface has running protrusions and / or running recesses extending from one side of the thinned area to the other.

[0022] In the above technical solution, by setting running-in protrusions and / or running-in recesses extending from one side of the thinning area to the other side on the running-in surface, different thicknesses can be achieved at different locations of the thinning area to obtain an ideal thinning curve.

[0023] In some embodiments, the ultrasonic shaping device further includes an ultrasonic generator, a transducer, and an amplitude modulation rod. The ultrasonic generator generates a high-frequency alternating current signal, the transducer receives the high-frequency alternating current signal generated by the ultrasonic generator and converts it into ultrasonic waves, and one end of the amplitude modulation rod is connected to the transducer and the other end is detachably connected to the shaping head.

[0024] In the above technical solution, by setting the ultrasonic shaping device to include an ultrasonic generator, a transducer and an amplitude modulator, it can drive the grinding surface to perform high-frequency, micro-amplitude reciprocating linear vibration on the thinning area, thereby precisely thinning the thinning area and eliminating thick edges, which can greatly improve the shaping capability of the ultrasonic shaping device for electrode strips; by setting the shaping head to be detachably connected to the other end of the amplitude modulator, different shaping heads can be replaced during production to obtain different thinning curves.

[0025] According to some embodiments of this application, the number of ultrasonic shaping devices and the number of thinning areas are multiple, the multiple thinning areas are arranged in the width direction of the electrode strip, and the positions of the multiple ultrasonic shaping devices and the multiple thinning areas correspond one-to-one.

[0026] By setting up multiple ultrasonic shaping devices and corresponding them one-to-one with multiple thinning areas, multiple thinning areas can be shaped simultaneously, greatly improving the production efficiency of electrode manufacturing equipment.

[0027] According to some embodiments of this application, the electrode manufacturing equipment further includes a detection element and an adjustment device. In the conveying direction of the electrode strip, the detection element is located downstream of the ultrasonic shaping device. The detection element is used to detect the thickness of the thinned area after shaping by the ultrasonic shaping device. The adjustment device is used to adjust the position of the ultrasonic shaping device relative to the thinned area based on the detection result of the detection element.

[0028] In the above technical solution, by setting the electrode manufacturing equipment to include a detection component and an adjustment device, the thickness of the thinned area after being shaped by the ultrasonic shaping device can be detected by the detection component, and the position of the ultrasonic shaping device relative to the thinned area can be adjusted by the adjustment device, which helps to improve the grinding effect of the ultrasonic shaping device on the thinned area, so that the thinned area of ​​the electrode strip after being shaped by the ultrasonic shaping device obtains the required thinning curve.

[0029] According to some embodiments of this application, the conveying device includes a first conveying roller and a second conveying roller, which are spaced apart and arranged in parallel for conveying the electrode strip. The coating device is disposed opposite to the first conveying roller, and the ultrasonic shaping device is disposed opposite to the second conveying roller.

[0030] In the above technical solution, by setting the conveying device to include a first conveying roller and a second conveying roller, and by setting the first conveying roller and the second conveying roller to be spaced apart and parallel, the first conveying roller and the second conveying roller can be used to convey the electrode strip; by setting the coating device opposite to the first conveying roller, it can assist the coating device in coating the electrode strip with slurry; by setting the ultrasonic shaping device opposite to the second conveying roller, it can assist the ultrasonic shaping device in shaping the thinned area of ​​the dried electrode strip.

[0031] In some specific embodiments, the conveying device further includes a plurality of support rollers, which are arranged parallel and spaced apart between the first conveying roller and the second conveying roller to support the electrode strip. The drying device includes an oven, and at least some of the support rollers are located inside the oven.

[0032] In the above technical solution, by arranging multiple support rollers in parallel and at intervals between the first and second conveyor rollers, the electrode strip can be supported on the one hand, and the first and second conveyor rollers can be assisted in conveying the electrode strip on the other hand, so that the electrode manufacturing equipment can operate normally. By setting at least some of the support rollers in the oven, the electrode strip in the oven can be supported, reducing the risk of the electrode strip slipping or shaking in the oven, so that the electrode strip can be fully dried in the oven.

[0033] Secondly, this application provides a battery electrode sheet, which includes a current collector and an active material layer. The current collector has a coating surface, the active material layer is disposed on the coating surface, and the coating surface includes a main region and a thinning region. In the width direction of the battery electrode sheet, the thinning region is connected to the side of the main region near the tab, the thickness of the main region is greater than the thickness of the thinning region, and the thinning region has a shaping surface, the roughness of which is less than the roughness of the remaining parts of the thinning region.

[0034] In the above technical solution, by setting the thickness of the main body area to be greater than the thickness of the thinning area, on the one hand, the stress concentration at the edge of the battery electrode can be reduced, thereby alleviating the problem of active material layer peeling off after the battery electrode has been used for a long time; on the other hand, by setting a shaping surface in the thinning area and setting the roughness of the shaping surface to be less than the roughness of the rest of the thinning area, the thick edge can be eliminated, reducing the damage to the battery electrode by the thick edge during the later winding of the battery electrode and reducing the risk of short circuit in the battery device.

[0035] In some specific embodiments, the shaping surface extends along the length direction of the battery electrode, and the dimension of the shaping surface in the width direction of the battery electrode is 0.1mm-10mm.

[0036] This design can reduce stress concentration at the edges of the battery electrode, thereby alleviating the problem of active material layer shedding after prolonged use. On the other hand, it allows for the pre-reservation of tab cutting areas on the battery electrode to form tabs after cutting. Later, the battery electrodes can be stacked or wound to pair multiple tabs and form tabs.

[0037] In some embodiments, the shaping surface is at least partially located at the edge of the thinning area away from the main body area.

[0038] In the above technical solution, by setting the shaping surface at least partially located at the edge of the thinning area away from the main body area, the stress can be evenly distributed on the battery electrode, reducing the risk of battery electrode damage caused by stress concentration and improving the overall performance and service life of the battery device.

[0039] In some examples, the surface roughness Ra of the shaped surface is less than or equal to 10 μm. This setting can reduce process defects on the shaped surface after polishing, thereby improving the charging performance and lifespan of the battery device.

[0040] In some embodiments, the shaping surface is at least partially a plane parallel to the coating surface, or the shaping surface is at least partially a plane or arc surface that gradually approaches the coating surface in a direction away from the main body area, or the shaping surface is at least partially a stepped surface.

[0041] This design can further reduce stress concentration at the edges of the battery electrodes, thereby alleviating the problem of active material layer shedding caused by prolonged use of the battery electrodes. It also reduces damage to the battery electrodes from the thick edges during later winding of the battery electrodes, significantly reducing the risk of short circuits within the battery device.

[0042] Thirdly, this application provides a battery cell, which includes the battery electrode sheet described in any of the above embodiments.

[0043] According to the embodiments of this application, by using battery electrodes including any of the above embodiments, the risk of battery electrodes damaging the separator can be reduced, thus giving the battery cell better safety.

[0044] Fourthly, this application provides a battery device, which includes the battery cell described in the above embodiments.

[0045] The battery device according to the embodiments of this application, by employing battery cells including those described above, not only enables the battery device to have good charging performance, but also improves the safety of the battery device.

[0046] Fifthly, this application provides an electrical device that includes a single battery cell as described in the above embodiments; or, includes a battery device as described in the above embodiments.

[0047] According to the embodiments of this application, by setting the electrical device to include the battery cell or battery device of the above embodiments, the electrical device can have good reliability.

[0048] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0050] Figure 1 This is a schematic diagram of the structure of an electrode manufacturing apparatus according to an embodiment of this application;

[0051] Figure 2 This is a schematic diagram of the electrode strip structure according to an embodiment of this application;

[0052] Figure 3 This is a partial structural schematic diagram of a battery electrode sheet according to an embodiment of this application;

[0053] Figure 4 for Figure 1 A schematic diagram of the ultrasonic shaping device in the electrode manufacturing equipment shown.

[0054] Figure 5 This is a schematic diagram of the thinned area of ​​the electrode strip according to an embodiment of this application before and after grinding;

[0055] Figure 6 This is a schematic projection of the running surface of the shaping head of an ultrasonic shaping device according to some embodiments of this application, on a plane perpendicular to the width direction of the electrode strip.

[0056] Figure 7This is a schematic projection of the running surface of the shaping head of the ultrasonic shaping device according to some other embodiments of this application, on a plane perpendicular to the width direction of the electrode strip.

[0057] Figure 8 This is a schematic projection of the running surface of the shaping head of the ultrasonic shaping device according to some embodiments of the present application, on a plane perpendicular to the width direction of the electrode strip.

[0058] Figure 9 This is a schematic projection of the running surface of the shaping head of an ultrasonic shaping device according to some embodiments of this application, on a plane perpendicular to the length direction of the electrode strip.

[0059] Figure 10 This is a schematic projection of the running surface of the shaping head of the ultrasonic shaping device according to other embodiments of this application, on a plane perpendicular to the length direction of the electrode strip.

[0060] Figure 11 This is a schematic diagram of the running surface of the shaping head of an ultrasonic shaping device according to some embodiments of this application;

[0061] Figure 12 This is a schematic diagram of the running surface of the shaping head of an ultrasonic shaping device according to other embodiments of this application;

[0062] Figure 13 This is a schematic diagram of the running surface of the shaping head of an ultrasonic shaping device according to some embodiments of this application;

[0063] Figure 14 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0064] Figure 15 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0065] The reference numerals in the detailed embodiments are as follows:

[0066] 100 electrode manufacturing equipment;

[0067] Conveying device 10; First conveying roller 11; Second conveying roller 12; Support roller 13;

[0068] Coating device 20; Coating die 21;

[0069] Drying device 30; drying oven 31;

[0070] Ultrasonic shaping device 40; first slider 40a; first inclined surface 40a1; second slider 40b; second inclined surface 40b1;

[0071] Shaping head 41; running surface 41a; extension surface 41a1; running convex part 41a2; running concave part 41a3;

[0072] 42. Ultrasonic generator; 43. Transducer; 44. Amplitude modulator;

[0073] Battery electrode 700; electrode strip 71;

[0074] Current collector 711; Coated surface 711a; Tab cutting area 711b;

[0075] Active material layer 712; Main body region 712a; Thinning region 712b; Shaping surface 712b1; Thick edge 712b2;

[0076] Electrode 73;

[0077] 800 for a single battery cell;

[0078] Battery assembly 900; Housing assembly 91;

[0079] Electrical device 1000; controller 1000a; motor 1000b. Detailed Implementation

[0080] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0082] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0083] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0084] In the description of the embodiments 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, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0085] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0086] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0087] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0088] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0089] In the production process of battery electrodes, there is a design difference between the thickness of the coating film at the edge and the thickness at the center of the coating area, necessitating the thinning of the coating film at the edge. Related technologies employ laser processing for this thinning process, which is not only difficult to control but may also damage the electrode.

[0090] Therefore, this application employs an electrode manufacturing equipment that uses an ultrasonic shaping device to shape the dried electrode strip, that is, to thin and shape the edge thickness of the active material layer. This not only allows for more accurate control of the thinning size of the thinning area and elimination of thick edges, resulting in a more ideal thinning curve, but also greatly reduces the impact on the electrode strip.

[0091] The electrode manufacturing equipment disclosed in this application can be used in battery production systems.

[0092] Reference Figures 1-3 , Figure 1 This is a schematic diagram of the structure of the electrode manufacturing apparatus 100 according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the electrode strip 71 according to an embodiment of this application; Figure 3 This is a partial structural schematic diagram of a battery electrode 700 according to an embodiment of this application. This application provides an electrode manufacturing apparatus 100, which includes a conveying device 10, a coating device 20, and a drying device 30.

[0093] The conveying device 10 is used to convey the electrode material strip 71, and the coating device 20 is used to coat the coating surface 711a of the current collector 711 of the electrode material strip 71 with slurry. In the conveying direction of the electrode material strip 71, the drying device 30 is located downstream of the coating device 20. The drying device 30 is used to dry the slurry on the current collector 711 to form an active material layer 712.

[0094] The conveying direction of the electrode strip 71 is as follows: Figure 1 The F1 direction in the middle.

[0095] Reference Figure 4 , Figure 4 for Figure 1 The diagram shows a schematic of the ultrasonic shaping device 40 in the electrode manufacturing equipment 100. The electrode manufacturing equipment 100 also includes the ultrasonic shaping device 40, which is located downstream of the drying device 30 in the conveying direction of the electrode strip 71. The ultrasonic shaping device 40 is used to shape the thinned area 712b of the active material layer 712 so that the roughness of the shaped surface 712b1 of the thinned area 712b is less than the roughness of the rest of the thinned area 712b.

[0096] Among them, the thinning region 712b of the active material layer 712 is shaped, that is, by actively reducing the thickness of the active material layer 712, the thinning region 712b can serve as a transition buffer between the current collector 711 and the active material layer 712, which can alleviate the edge stress concentration of the battery electrode 700.

[0097] Furthermore, after the thinning area 712b of the battery electrode 700 is polished and shaped, a shaping surface 712b1 can be formed on the thinning area 712b. The shaping surface 712b1 has a smaller roughness than other parts, and a clear smooth and bright band can be seen on the surface of the battery electrode 700.

[0098] In the technical solution of this application embodiment, by setting the electrode manufacturing equipment 100 to include a conveying device 10, a coating device 20, a drying device 30 and an ultrasonic shaping device 40, the coating and drying steps of the electrode strip 71 can be completed by the conveying device 10, the coating device 20 and the drying device 30. The ultrasonic shaping device 40 is used to shape the dried electrode strip 71, that is, to thin the thinning area 712b of the active material layer 712. This not only allows for more accurate control of the thinning size of the thinning area 712b and the obtaining of a more ideal thinning curve, but also greatly reduces the impact of the shaping process on the electrode strip 71.

[0099] For example, the coating apparatus 20 is provided with a coating die 21.

[0100] During electrode manufacturing, the conveying device 10 can sequentially convey the electrode strip 71 to the coating die head 21, the drying device 30, etc. During the conveying process, the coating device 20 applies slurry to the coating surface 711a of the current collector 711 of the electrode strip 71 through the coating die head 21, and the drying device 30 dries the slurry on the current collector 711, thereby forming the active material layer 712.

[0101] Reference Figure 5 , Figure 5 This is a schematic diagram of the thinning area 712b of the electrode strip 71 before and after polishing, according to an embodiment of this application.

[0102] When the coating die 21 applies the slurry to the coating surface 711a of the current collector 711 of the electrode strip 71, there are gas-liquid-solid three-phase lines at the edge of the fresh slurry. Due to the surface tension, the slurry tends to shrink and flow from the center area to the edge.

[0103] When the drying device 30 dries the slurry on the current collector 711, the solvent evaporation rate at the edge of the slurry is usually faster than that in the center, leading to a local increase in slurry concentration and surface tension. This gradient difference in surface tension drives the slurry to flow from the low-surface-tension area to the high-surface-tension area, that is, from the center to the edge, exacerbating slurry accumulation at the edge. (Refer to...) Figure 5 In Figure (a), after the drying device 30 dries the slurry, the thickness of the edge of the active material layer 712 is significantly higher than the thickness of the area near the center of the active material layer 712, thus forming a thick edge 712b2.

[0104] Reference Figure 1 and Figure 5 In Figure (b), the conveying device 10 conveys the dried electrode strip 71 toward the ultrasonic shaping device 40. The ultrasonic shaping device 40 can shape the thick edge 712b2 and eliminate the thick edge 712b2, so as to reduce the damage of the thick edge 712b2 to the battery electrode 700 when the battery electrode 700 is wound up later.

[0105] Reference Figures 2-5 In some embodiments, the ultrasonic shaping device 40 includes a shaping head 41. The shaping head 41 has a grinding surface 41a extending along the width direction of the electrode strip 71 on the side facing the electrode strip 71. When the electrode strip 71 moves relative to the shaping head 41 in the conveying direction, the shaping head 41 grinds the thinning area 712b through the grinding surface 41a to reduce the local thickness of the thinning area 712b. Here, the width direction of the electrode strip 71 refers to... Figures 2-3 The F2 direction in the middle.

[0106] Specifically, the surface shape of the running surface 41a is set to the shape after the thinning area 712b is polished. When the electrode strip 71 moves relative to the shaping head 41 along the conveying direction, the running surface 41a of the shaping head 41 contacts the thinning area 712b, thereby thinning the thinning area 712b and polishing the thick edge 712b2. The conveying device 10 continues to convey the electrode strip 71. When the electrode strip 71 separates from the running surface 41a of the shaping head 41, the excess active material layer 712 of the thinning area 712b is polished away by the running surface 41a, thereby reducing the local thickness of the thinning area 712b, obtaining a more ideal thinning curve, and processing the thick edge 712b2.

[0107] In the above technical solution, by setting the ultrasonic shaping device 40 to include a shaping head 41, and when the electrode strip 71 moves relative to the shaping head 41 along the conveying direction, the grinding surface 41a of the shaping head 41 contacts the thinning area 712b, so that the grinding surface 41a can be used to thin the thinning area 712b, so that the thinning area 712b after grinding meets the design requirements.

[0108] In addition, the thinned area 712b, which is polished by the running surface 41a, has a curve shape that is consistent with the shape of the running surface 41a. During production, different shapes of the running surface 41a can be replaced according to different needs, thereby achieving standardized and mass production and improving production efficiency.

[0109] Existing production processes require the use of coated gaskets with chamfering. Different chamfer sizes are adjusted based on the shape of the 712b curve in the thinned zone. Before formal production, multiple gaskets with different chamfer sizes often need to be verified, wasting significant time and resources. Furthermore, the coating slurry is a non-Newtonian fluid, and for different product systems, there is often no historical experience to refer to regarding the chamfer structure of the coated gaskets. This necessitates repeated adjustments to the chamfer structure, greatly hindering the standardization and uniformity of coated gaskets.

[0110] For example, since the thinning zone 712b can obtain a more ideal thinning curve after being shaped by the ultrasonic shaping device 40, compared with the existing process, the ultrasonic shaping device 40 can eliminate the need for the coating gasket chamfering process. This can save the verification process of different chamfering gaskets before production, save a lot of time, further improve production efficiency, and reduce production costs.

[0111] Reference Figure 2 and Figure 3 In some specific embodiments, the size of the shaping head 41 is greater than or equal to the size of the thinning area 712b in the width direction of the electrode strip 71.

[0112] In the width direction of the electrode strip 71, if the size of the shaping head 41 is smaller than the size of the thinning area 712b, when the ultrasonic shaping device 40 shapes the thinning area 712b, the mating surface 41a can only contact a part of the thinning area 712b. That is, the mating surface 41a can only grind the part of the thinning area 712b that is in contact with the mating surface 41a. This will result in the thinning area 712b after being processed by the ultrasonic shaping device 40 having an un-grinded part, making the local thickness of the thinning area 712b too large.

[0113] Therefore, in the above technical solution, by setting the shaping head 41 so that its dimension in the width direction of the electrode strip 71 is greater than or equal to the dimension of the thinned area 712b in the width direction of the electrode strip 71, when the ultrasonic shaping device 40 shapes the thinned area 712b of the electrode strip 71, the grinding surface 41a can completely cover the thinned area 712b. Thus, during the conveying process of the electrode strip 71, the thinned area 712b is shaped once, achieving all-round grinding. This reduces the number of times the ultrasonic shaping device 40 shapes the electrode strip 71, or reduces the number of times or the length of the conveying device 10 conveys the electrode strip 71. After the electrode strip 71 is shaped by the ultrasonic shaping device 40, the possibility that the thinned area 712b still has a large local thickness is reduced.

[0114] Reference Figure 2 and further refer to Figure 6 , Figure 6 This is a schematic projection of the running surface 41a of the shaping head 41 of the ultrasonic shaping apparatus 40 according to some embodiments of this application onto a plane perpendicular to the width direction of the electrode strip 71. In some examples, the projection of the running surface 41a onto the plane perpendicular to the width direction of the electrode strip 71 is parallel to the projection of the coating surface 711a onto the plane.

[0115] In the above technical solution, by setting the projection of the running surface 41a on the plane to be parallel to the projection of the coating surface 711a on the plane, the running surface 41a can be in full contact with the thinned area 712b of the coating surface 711a, so as to fully eliminate the thick edge 712b2 of the thinned area 712b, thereby obtaining a zero-thinning and no thick edge 712b2 appearance.

[0116] Reference Figure 7 and Figure 8 , Figure 7 This is a schematic projection of the running surface 41a of the shaping head 41 of the ultrasonic shaping device 40 according to other embodiments of this application, on a plane perpendicular to the width direction of the electrode strip 71. Figure 8 This is a schematic projection of the running surface 41a of the shaping head 41 of the ultrasonic shaping apparatus 40 according to some embodiments of the present application onto a plane perpendicular to the width direction of the electrode strip 71. In some examples, the distance between the projection of the running surface 41a onto the plane perpendicular to the width direction of the electrode strip 71 and the projection of the coating surface 711a onto the plane gradually increases or decreases along the conveying direction of the electrode strip 71.

[0117] For example, the distance between the projection of the running surface 41a on the plane and the projection of the coating surface 711a on the plane gradually decreases along the conveying direction of the electrode strip 71, so that the running surface 41a contacts the electrode strip 71 at the front end of the conveying direction of the electrode strip 71. This can reduce the over-grinding of the electrode strip 71 and improve the grinding effect on the thinning area 712b.

[0118] For example, the distance between the projection of the grinding surface 41a onto the plane and the projection of the coating surface 711a onto the plane gradually increases along the conveying direction of the electrode material belt 71. This creates a gap between the grinding surface 41a and the electrode material belt 71, allowing the abrasive chips to be discharged naturally, avoiding accumulation, reducing damage to the active material layer 712, and improving the polishing effect on the thinned area 712b.

[0119] Therefore, in the above technical solution, by setting the distance between the projection of the grinding surface 41a onto a plane perpendicular to the width direction of the electrode strip 71 and the projection of the coating surface 711a onto a plane perpendicular to the width direction of the electrode strip 71, the distance gradually increases or decreases along the conveying direction of the electrode strip 71, so that the grinding surface 41a and the coating surface 711a form a certain angle, the grinding effect on the thinning area 712b can be improved.

[0120] Continue to refer to Figure 7 and Figure 8 In some specific examples, the projection of the running surface 41a onto the plane and the projection of the coating surface 711a onto the plane are set at a preset angle, which is less than or equal to 15°. For example, the preset angle can be 15°, 14°, 12°, 10°, 5°, etc.

[0121] If the preset angle between the projection of the running surface 41a on the plane and the projection of the coating surface 711a on the plane is greater than 15°, the running surface 41a and the thinning area 712b are very likely to be insufficiently polished, so that the thinning area 712b after polishing the running surface 41a cannot meet the design requirements.

[0122] In the above technical solution, by setting the projection of the running surface 41a on the plane at an angle to the projection of the coating surface 711a on the plane, and setting the preset angle to less than or equal to 15°, the grinding effect on the thinning area 712b can be improved.

[0123] Reference Figure 9 , Figure 9This is a schematic projection of the running surface 41a of the shaping head 41 of the ultrasonic shaping apparatus 40 according to some embodiments of the present application, on a plane perpendicular to the length direction of the electrode strip 71. In some embodiments, in the width direction of the electrode strip 71, the running surface 41a is at least partially a plane parallel to the coating surface 711a, or the running surface 41a is at least partially a plane or arc surface that gradually approaches the coating surface 711a in a direction away from the main body region 712a of the active material layer 712.

[0124] In the width direction of the electrode strip 71, by setting the grinding surface 41a to be at least partially parallel to the coating surface 711a, that is, by setting the grinding surface 41a to be at least partially in parallel contact with the thinning area 712b, when the thinning area 712b is ground by the grinding surface 41a, the thick edge 712b2 on the thinning area 712b can be removed by the grinding surface 41a, so that the electrode strip 71 has a zero-thinning appearance and no thick edge 712b2; by setting the grinding surface 41a to be at least partially a plane or arc surface that gradually approaches the coating surface 711a in the direction away from the main body area 712a of the active material layer 712, that is, the distance between the grinding surface 41a and the thinning area 712b at different positions is different, thereby the grinding surface 41a can be used to perform thinning treatment of different thicknesses at different positions of the thinning area 712b.

[0125] For example, refer to Figure 9 In the direction away from the main body area 712a of the active material layer 712, such as at positions of 2, 5, 7, 10 mm, the distance between the running surface 41a and the coating surface 711a is different, so that the running surface 41a can polish the thinning area 712b to different degrees, thereby obtaining a more ideal thinning curve.

[0126] Reference Figure 10 , Figure 10 This is a schematic projection of the running surface 41a of the shaping head 41 of the ultrasonic shaping device 40 according to other embodiments of this application, in a plane perpendicular to the length direction of the electrode strip 71. In some embodiments, the running surface 41a includes a plurality of extension surfaces 41a1 arranged in the width direction of the electrode strip 71. The plurality of extension surfaces 41a1 are parallel to the coating surface 711a. In the width direction of the electrode strip 71, the vertical distance between the plurality of extension surfaces 41a1 and the coating surface 711a tends to decrease along the direction away from the main body region 712a of the active material layer 712.

[0127] In the above technical solution, by setting the grinding surface 41a to include multiple extension surfaces 41a1 arranged in the width direction of the electrode strip 71, and setting the multiple extension surfaces 41a1 parallel to the coating surface 711a, the multiple extension surfaces 41a1 can contact the thinning area 712b of the electrode strip 71, thereby achieving sufficient grinding of the thinning area 712b by the grinding surface 41a. In the width direction of the electrode strip 71, by setting the vertical distance between the multiple extension surfaces 41a1 and the coating surface 711a to decrease in the direction away from the main body area 712a of the active material layer 712, that is, the grinding surface 41a is a gradient grinding surface. When the grinding surface 41a contacts the thinning area 712b, the extension surfaces 41a1 of different gradients contact the corresponding thinning area 712b to achieve grinding of different thicknesses, thereby obtaining the required thinning curve.

[0128] For example, refer to Figure 10 In the direction along the main area 712a away from the active material layer 712, such as at positions of 2, 5, 7, 10 mm, the distance between the extension surface 41a1 and the coating surface 711a is different, so that the running surface 41a can polish the thinning area 712b to different degrees, thereby obtaining a more ideal thinning curve.

[0129] Reference Figures 11-13 , Figure 11 This is a schematic diagram of the running surface 41a of the shaping head 41 of the ultrasonic shaping device 40 according to some embodiments of this application. Figure 12 This is a schematic diagram of the running surface 41a of the shaping head 41 of the ultrasonic shaping device 40 according to other embodiments of this application. Figure 13 This is a schematic diagram of the running surface 41a of the shaping head 41 of the ultrasonic shaping device 40 according to some embodiments of this application. In some examples, the running surface 41a has a running protrusion 41a2 and / or a running recess 41a3 extending from one side of the thinning area 712b to the other side.

[0130] For example, the running surface 41a has a running protrusion 41a2 extending from one side of the thinning area 712b to the other. When the thinning area 712b is ground on the running surface 41a, the running protrusion 41a2 contacts the thinning area 712b to reduce the local thickness of the thinning area 712b in contact with the running protrusion 41a2, thereby achieving a large thickness reduction on the thinning area 712b. The running protrusion 41a2 can be a linear boss, a circular boss, or an edge-shaped boss.

[0131] For example, the running surface 41a has a running recess 41a3 extending from one side of the thinning area 712b to the other side, which can achieve thinning of a small thickness on the thinning area 712b when the running surface 41a is used to grind the thinning area 712b. The running recess 41a3 can be a linear groove, a circular groove, or a prismatic groove.

[0132] For example, the running surface 41a has a running protrusion 41a2 and a running recess 41a3 extending from one side of the thinning area 712b to the other side. When the running surface 41a grinds the thinning area 712b, it can contact the thinning area 712b through the running protrusion 41a2 and the running recess 41a3 to achieve thinning of different thicknesses on the thinning area 712b.

[0133] In the above technical solution, by providing running-in protrusions 41a2 and / or running-in recesses 41a3 extending from one side of the thinning area 712b to the other side on the running-in surface 41a, different thicknesses can be achieved at different positions of the thinning area 712b to obtain an ideal thinning curve.

[0134] Reference Figure 4 In some embodiments, the ultrasonic shaping device 40 further includes an ultrasonic generator 42, a transducer 43, and an amplitude modulation rod 44. The ultrasonic generator 42 is used to generate a high-frequency alternating current signal, the transducer 43 is used to receive the high-frequency alternating current signal generated by the ultrasonic generator 42 and convert it into ultrasonic waves, and one end of the amplitude modulation rod 44 is connected to the transducer 43 and the other end is detachably connected to the shaping head 41.

[0135] Specifically, the ultrasonic generator 42 can generate a high-frequency alternating current signal. The transducer 43 receives the high-frequency alternating current signal generated by the ultrasonic generator 42 and converts it into ultrasonic waves. The ultrasonic waves generate periodic, rapid, and minute stretching vibrations within the transducer 43. The amplitude modulation rod 44 is connected to the transducer 43 to amplify the minute stretching vibrations generated by the ultrasonic waves and transmit the amplified vibrations to the shaping head 41. The shaping head 41 then drives the grinding surface 41a to perform high-frequency, micro-amplitude reciprocating linear vibrations on the thinning area 712b at the same frequency as the ultrasonic waves, thereby realizing the shaping of the electrode strip 71 by the ultrasonic shaping device 40.

[0136] In the above technical solution, by setting the ultrasonic shaping device 40 to include an ultrasonic generator 42, a transducer 43 and an amplitude modulation rod 44, the running surface 41a can be driven to perform high-frequency, micro-amplitude reciprocating linear vibration on the thinning area 712b, thereby precisely thinning the thinning area 712b and eliminating the thick edge 712b2, which can greatly improve the shaping ability of the ultrasonic shaping device 40 for the electrode strip 71.

[0137] In addition, by setting the shaping head 41 to be detachably connected to the other end of the amplitude adjustment rod 44, different shaping heads 41 can be replaced during production to obtain different thinning curves.

[0138] For example, the ultrasonic shaping device 40 also includes a first slider 40a and a second slider 40b. The first slider 40a is provided with a first inclined surface 40a1, and the second slider 40b is provided with a second inclined surface 40b1. The first slider 40a is connected to the ultrasonic generator 42. The ultrasonic generator 42 moves in a direction perpendicular to the electrode strip 71 through the sliding engagement of the first inclined surface 40a1 and the second inclined surface 40b1, thereby adjusting the distance between the grinding surface 41a and the thinning area 712b on the electrode strip 71.

[0139] Reference Figure 1 and Figure 2 According to some embodiments of this application, the number of ultrasonic shaping devices 40 is multiple and the number of thinning areas 712b is also multiple. The multiple thinning areas 712b are arranged in the width direction of the electrode strip 71, and the positions of the multiple ultrasonic shaping devices 40 and the multiple thinning areas 712b correspond one-to-one.

[0140] In actual production, since there may be multiple thinning areas 712b on the electrode strip 71, and one ultrasonic shaping device 40 can only shape a single thinning area 712b of the electrode strip 71, by setting up multiple ultrasonic shaping devices 40 and corresponding the positions of multiple ultrasonic shaping devices 40 with multiple thinning areas 712b, multiple thinning areas 712b can be shaped simultaneously, which greatly improves the production efficiency of the electrode manufacturing equipment 100.

[0141] Reference Figure 1 and Figure 4 According to some embodiments of this application, the electrode manufacturing equipment 100 further includes a detection element (not shown) and an adjustment device (not shown). In the conveying direction of the electrode strip 71, the detection element is located downstream of the ultrasonic shaping device 40. The detection element is used to detect the thickness of the thinned area 712b after being shaped by the ultrasonic shaping device 40. The adjustment device is used to adjust the position of the ultrasonic shaping device 40 relative to the thinned area 712b according to the detection result of the detection element.

[0142] Specifically, after the electrode strip 71 is shaped by the ultrasonic shaping device 40, the testing device will perform thickness testing on the thinned area 712b of the electrode strip 71. If the test result is qualified, production can continue. If the test result is unqualified, the adjusting device can adjust the position of the ultrasonic shaping device 40 relative to the thinned area 712b according to the specific test result of the testing device until the test result is qualified.

[0143] In the above technical solution, by setting the electrode manufacturing equipment 100 to include a detection element and an adjustment device, the thickness of the thinned area 712b after being shaped by the ultrasonic shaping device 40 can be detected by the detection element, and the position of the ultrasonic shaping device 40 relative to the thinned area 712b can be adjusted by the adjustment device, which is beneficial to improving the polishing effect of the ultrasonic shaping device 40 on the thinned area 712b, so that the thinned area 712b of the electrode strip 71 after being shaped by the ultrasonic shaping device 40 obtains the required thinning curve.

[0144] For example, when adjusting the position of the ultrasonic shaping device 40 relative to the thinning zone 712b, it can be adjusted manually or automatically through the closed-loop control of the adjusting device.

[0145] For example, the ultrasonic shaping device 40 further includes a first slider 40a and a second slider 40b. The first slider 40a has a first inclined surface 40a1, and the second slider 40b has a second inclined surface 40b1. The first slider 40a is connected to an ultrasonic generator 42, and the ultrasonic generator 42 is slidably engaged with the first inclined surface 40a1 and the second inclined surface 40b1. The adjusting device can drive the first slider 40a and the second slider 40b to slide relative to each other, so that the first slider 40a can move in a direction perpendicular to the electrode strip 71, thereby adjusting the distance between the grinding surface 41a and the thinning area 712b on the electrode strip 71.

[0146] For example, the testing device can be a laser thickness gauge, which can obtain the thickness curve morphology of the thinned region 712b by scanning the thickness dimension of the electrode strip 71, and / or obtain the position of the thick edge 712b2 of the thinned region 712b and the thickness difference between the main body region 712a of the diaphragm.

[0147] The obtained thickness curve of the thinned area 712b is compared with the ideal thickness curve of the thinned area 712b to obtain the test result. Then, through closed-loop control, the adjustment device adjusts the position of the ultrasonic shaping device 40 relative to the thinned area 712b according to the test result, so that the thinned area 712b of the shaped electrode strip 71 obtains the ideal thinning curve.

[0148] The obtained position of the thick edge 712b2 of the thinned area 712b and the thickness difference of the main body area 712a of the diaphragm are compared with the ideal position of the thick edge 712b2 of the thinned area 712b and the thickness difference of the main body area 712a of the diaphragm to obtain the detection result. Then, through closed-loop control, the adjustment device adjusts the position of the ultrasonic shaping device 40 relative to the thinned area 712b according to the detection result, so that the thinned area 712b of the shaped electrode strip 71 obtains a curve appearance with zero thinning and no thick edge 712b2.

[0149] For example, the detection element and adjustment device can be kept running continuously to enable real-time monitoring and adjustment of the thinning zone 712b.

[0150] Reference Figure 1 According to some embodiments of this application, the conveying device 10 includes a first conveying roller 11 and a second conveying roller 12, which are spaced apart and arranged in parallel for conveying the electrode strip 71.

[0151] The coating device 20 is positioned opposite to the first conveyor roller 11, and the ultrasonic shaping device 40 is positioned opposite to the second conveyor roller 12.

[0152] Specifically, the coating device 20 is arranged opposite to the first conveyor roller 11. When the first conveyor roller 11 conveys the electrode material strip 71, the first conveyor roller 11 can support the electrode material strip 71 on the first conveyor roller 11, reduce the possibility of the electrode material strip 71 shaking, and enable the coating device 20 to stably coat the slurry on the current collector 711 of the electrode material strip 71, thereby assisting the coating device 20 in coating the electrode material strip 71 with slurry.

[0153] Specifically, the ultrasonic shaping device 40 is arranged opposite to the second conveyor roller 12. When the second conveyor roller 12 conveys the electrode strip 71, it can support the electrode strip 71 on the second conveyor roller 12. When the ultrasonic shaping device 40 shapes the electrode strip 71, the second conveyor roller 12 can reduce the possibility that the position of the thinned area 712b of the electrode strip 71 will change due to vibration. This allows the ultrasonic shaping device 40 to perform stable shaping of the thinned area 712b of the electrode strip 71, thereby assisting the ultrasonic shaping device 40 in shaping the thinned area 712b of the electrode strip 71.

[0154] In the above technical solution, by setting the conveying device 10 to include a first conveying roller 11 and a second conveying roller 12, and by arranging the first conveying roller 11 and the second conveying roller 12 at intervals and in parallel, the electrode strip 71 can be conveyed by the first conveying roller 11 and the second conveying roller 12; by arranging the coating device 20 opposite to the first conveying roller 11, it can assist the coating device 20 in coating the electrode strip 71 with slurry; by arranging the ultrasonic shaping device 40 opposite to the second conveying roller 12, it can assist the ultrasonic shaping device 40 in shaping the thinned area 712b of the dried electrode strip 71.

[0155] Continue to refer to Figure 1 In some specific embodiments, the conveying device 10 further includes a plurality of support rollers 13, which are arranged in parallel and spaced apart between the first conveying roller 11 and the second conveying roller 12 to support the electrode strip 71.

[0156] The drying device 30 includes an oven 31, with at least a portion of the support rollers 13 located inside the oven 31.

[0157] In the above technical solution, by arranging multiple support rollers 13 in parallel and at intervals between the first conveyor roller 11 and the second conveyor roller 12, the electrode strip 71 can be supported on the one hand, and the first conveyor roller 11 and the second conveyor roller 12 can assist in conveying the electrode strip 71 on the other hand, so that the electrode manufacturing equipment 100 can operate normally. By setting at least some of the support rollers 13 in the oven 31, the electrode strip 71 in the oven 31 can be supported, reducing the risk of the electrode strip 71 slipping or shaking in the oven 31, so that the electrode strip 71 can be fully dried in the oven 31.

[0158] Reference Figure 2 and Figure 3 This application provides a battery electrode 700, which includes a current collector 711 and an active material layer 712.

[0159] The current collector 711 has a coating surface 711a, and an active material layer 712 is disposed on the coating surface 711a. The coating surface 711a includes a main body region 712a and a thinning region 712b. In the width direction of the battery electrode 700, the thinning region 712b is connected to the side of the main body region 712a near the tab 73. The thickness of the main body region 712a is greater than the thickness of the thinning region 712b. The thinning region 712b has a shaping surface 712b1. The roughness of the shaping surface 712b1 is less than the roughness of the rest of the thinning region 712b.

[0160] In other words, after the thinning area 712b of the battery electrode 700 is polished and shaped, a shaping surface 712b1 can be formed on the thinning area 712b. The shaping surface 712b1 has a smaller roughness than other parts, and a clear smooth and bright band can be seen on the surface of the battery electrode 700.

[0161] In the above technical solution, by setting the thickness of the main body region 712a to be greater than the thickness of the thinning region 712b, the stress concentration at the edge of the battery electrode 700 can be reduced, thereby alleviating the problem of the active material layer 712 falling off after the battery electrode 700 has been used for a long time. By setting a shaping surface 712b1 in the thinning region 712b and setting the roughness of the shaping surface 712b1 to be less than the roughness of the rest of the thinning region 712b, the thick edge 712b2 can be eliminated. During the subsequent winding of the battery electrode 700, the damage to the battery electrode 700 caused by the thick edge 712b2 is reduced, thereby reducing the risk of short circuit within the battery device 900.

[0162] Continue to refer to Figure 2In some specific embodiments, the shaping surface 712b1 extends along the length direction of the battery electrode 700, and the dimension of the shaping surface 712b1 in the width direction of the battery electrode 700 is 0.1mm-10mm.

[0163] This design can reduce stress concentration at the edges of the battery electrode 700, thereby alleviating the problem of the active material layer 712 falling off after the battery electrode 700 has been used for a long time. On the other hand, a tab cutting area 711b can be reserved on the battery electrode 700 to form a tab after cutting. Later, the battery electrode 700 can be stacked or wound to pair multiple tabs and form a tab 73.

[0164] Refer again Figure 3 In some embodiments, the shaping surface 712b1 is at least partially located at the edge of the thinning region 712b away from the main body region 712a.

[0165] In the above technical solution, by setting the shaping surface 712b1 to be at least partially located at the edge of the thinning area 712b away from the main body area 712a, the stress can be evenly distributed on the battery electrode 700, reducing the risk of damage to the battery electrode 700 caused by stress concentration, and improving the overall performance and service life of the battery device 900.

[0166] Reference Figure 3 In some examples, the roughness Ra of the shaped surface 712b1 is less than or equal to 10 μm. This setting can reduce process defects in the shaped surface 712b1 after polishing, thereby improving the charging performance and service life of the battery device 900.

[0167] Reference Figure 3 , Figure 4 , Figure 9 and Figure 10 In some embodiments, the shaping surface 712b1 is at least partially a plane parallel to the coating surface 711a, or the shaping surface 712b1 is at least partially a plane or arc surface that gradually approaches the coating surface 711a in a direction away from the main body region 712a, or the shaping surface 712b1 is at least partially a stepped surface.

[0168] This design can further reduce stress concentration at the edge of the battery electrode 700, thereby alleviating the problem of the active material layer 712 falling off after the battery electrode 700 has been used for a long time. It also reduces the damage to the battery electrode 700 caused by the thick edge 712b2 when the battery electrode 700 is wound up later, and significantly reduces the risk of short circuit within the battery device 900.

[0169] This application provides a battery cell 800, which includes the battery electrode 700 of any of the above embodiments. The battery electrode 700 can be the positive electrode and / or negative electrode of the battery cell 800.

[0170] According to the embodiments of this application, by employing battery electrode 700 including any of the above embodiments, the risk of battery electrode 700 damaging the separator can be reduced, thus giving the battery cell 800 better safety.

[0171] A battery cell 800 refers to the smallest unit that makes up a battery device 900. A battery cell 800 can be cylindrical, flat, cuboid, or other shapes.

[0172] In some embodiments, the battery cell 800 includes an end cap (not shown), a housing (not shown), an electrode assembly (not shown), and other functional components.

[0173] A casing cap is a component that closes onto the opening of the casing to isolate the internal environment of the battery cell 800 from the external environment. The shape of the end cap can be adapted to the shape of the casing to fit the casing. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 800 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used for electrical connection with electrode assemblies to output or input electrical energy to the battery cell 800. In some embodiments, the end cap can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 800 reaches a threshold. The material of the end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap, which can be used to isolate the electrical connection components inside the casing from the end cap to reduce the risk of short circuits. For example, the insulating element can be made of plastic, rubber, etc.

[0174] The housing is a component used to mate with the end cap to form the internal environment of the battery cell 800, wherein the formed internal environment can accommodate electrode components, electrolyte, and other components. The housing and end cap can be independent components, with an opening provided on the housing. The end cap closes the opening to form the internal environment of the battery cell 800. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing, and the end cap closes the housing when it is necessary to encapsulate the interior. The housing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0175] The electrode assembly is the component in the battery cell 800 where the electrochemical reaction occurs. The casing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab 73. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 900, the positive and negative active materials react with the electrolyte, and the tabs 73 connect to the electrode terminals to form a current loop.

[0176] Please refer to Figure 14 , Figure 14 This is a schematic diagram of the structure of a battery device 900 provided in some embodiments of this application. This application provides a battery device 900, which includes a single battery cell 800 from any of the above embodiments.

[0177] The battery device 900 according to the embodiments of this application, by employing the battery cell 800 including those described above, not only can the battery device 900 have good charging performance, but the safety of the battery device 900 is also improved.

[0178] The battery device 900 disclosed in this application embodiment can be used in an electrical device 1000 that uses the battery device 900 as a power source or in various energy storage systems that use the battery device 900 as an energy storage element.

[0179] In some embodiments, the battery device 900 includes a housing assembly 91 and a battery cell 800, the battery cell 800 being housed within the housing assembly 91.

[0180] The housing assembly 91 provides a receiving space for the battery cell 800, and the housing assembly 91 can adopt various structures. In some embodiments, the housing assembly 91 may include a first part and a second part, which overlap each other, and the first part and the second part together define a receiving space for receiving the battery cell 800. The second part may be a hollow structure with one end open, and the first part may be a plate-like structure, with the first part covering the open side of the second part so that the first part and the second part together define the receiving space; the first part and the second part may also be hollow structures with one side open, with the open side of the first part covering the open side of the second part. Of course, the housing assembly 91 formed by the first part and the second part can be of various shapes, such as a cylinder, a cuboid, etc.

[0181] In the battery device 900, there can be multiple battery cells 800, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 800 are connected in both series and parallel connections. Multiple battery cells 800 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 800 is housed within the housing assembly 91. Alternatively, the battery device 900 can also be composed of multiple battery cells 800 first connected in series, parallel, or in a mixed configuration to form battery device 900 modules, which are then connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing assembly 91. The battery device 900 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 800.

[0182] Each battery cell 800 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0183] This application provides an electrical device 1000, which includes the battery cell 800 of the above embodiment; or, the electrical device 1000 includes the battery device 900 of the above embodiment.

[0184] The power-consuming device 1000 can be any of the devices or systems described above that utilize the battery device 900. For example, the power-consuming device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0185] According to the embodiments of this application, the power device 1000 can have good reliability by setting the power device 1000 to include the battery cell 800 or the battery device 900 of the above embodiments.

[0186] Please refer to Figure 15 , Figure 15 The electrical device 1000 shown in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 900 is installed inside the vehicle, and the battery device 900 can be located at the bottom, front, or rear of the vehicle. The battery device 900 can be used to power the vehicle; for example, the battery device 900 can serve as the vehicle's operating power source. The vehicle may also include a controller 1000a and a motor 1000b. The controller 1000a controls the battery device 900 to supply power to the motor 1000b, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0187] In some embodiments of this application, the battery device 900 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode manufacturing device, characterized in that, include: Conveying device (10) for conveying electrode strip (71). A coating apparatus (20) is used to coat a slurry on the coating surface (711a) of the current collector (711) of the electrode strip (71); A drying device (30) is located downstream of the coating device (20) in the conveying direction of the electrode strip (71) to dry the slurry on the current collector (711) to form an active material layer (712). An ultrasonic shaping device (40) is located downstream of the drying device (30) in the conveying direction of the electrode strip (71) to shape the thinned area (712b) of the active material layer (712) so that the roughness of the shaped surface (712b1) of the thinned area (712b) is less than the roughness of the rest of the thinned area (712b).

2. The electrode manufacturing equipment according to claim 1, characterized in that, The ultrasonic shaping device (40) includes a shaping head (41) with a grinding surface (41a) extending along the width direction of the electrode strip (71) on one side facing the electrode strip (71). When the electrode strip (71) moves relative to the shaping head (41) along the conveying direction, the shaping head (41) grinds the thinning area (712b) through the grinding surface (41a) to reduce the local thickness of the thinning area (712b).

3. The electrode manufacturing equipment according to claim 2, characterized in that, In the width direction of the electrode strip (71), the size of the shaping head (41) is greater than or equal to the size of the thinning zone (712b).

4. The electrode manufacturing equipment according to claim 2, characterized in that, In a plane perpendicular to the width direction of the electrode strip (71), the projection of the running surface (41a) on the plane is parallel to the projection of the coating surface (711a) on the plane.

5. The electrode manufacturing equipment according to claim 2, characterized in that, In a plane perpendicular to the width direction of the electrode strip (71), the distance between the projection of the running surface (41a) on the plane and the projection of the coating surface (711a) on the plane gradually increases or decreases along the conveying direction of the electrode strip (71).

6. The electrode manufacturing equipment according to claim 5, characterized in that, The projection of the running surface (41a) onto the plane and the projection of the coating surface (711a) onto the plane are set at a preset angle, wherein the preset angle is less than or equal to 15°.

7. The electrode manufacturing equipment according to claim 2, characterized in that, In the width direction of the electrode strip (71), the running surface (41a) is at least partially a plane parallel to the coating surface (711a), or the running surface (41a) is at least partially a plane or arc surface that gradually approaches the coating surface (711a) in a direction away from the main body region (712a) of the active material layer (712).

8. The electrode manufacturing equipment according to claim 2, characterized in that, The running surface (41a) includes a plurality of extension surfaces (41a1) arranged in the width direction of the electrode strip (71). The plurality of extension surfaces (41a1) are parallel to the coating surface (711a). In the width direction of the electrode strip (71), the vertical distance between the plurality of extension surfaces (41a1) and the coating surface (711a) tends to decrease along the direction away from the main body region (712a) of the active material layer (712).

9. The electrode manufacturing equipment according to claim 2, characterized in that, The running surface (41a) has a running protrusion (41a2) and / or a running recess (41a3) extending from one side of the thinning area (712b) to the other side.

10. The electrode manufacturing equipment according to claim 2, characterized in that, The ultrasonic shaping device (40) further includes: An ultrasonic generator (42) is used to generate high-frequency alternating current signals; A transducer (43) is used to receive the high-frequency AC signal generated by the ultrasonic generator (42) and convert it into ultrasonic waves. An amplitude adjustment rod (44) is provided, one end of which is connected to the transducer (43) and the other end of which is detachably connected to the shaping head (41).

11. The electrode manufacturing equipment according to any one of claims 1-10, characterized in that, The number of ultrasonic shaping devices (40) is the same as the number of thinning areas (712b). The multiple thinning areas (712b) are arranged in the width direction of the electrode strip (71). The positions of the multiple ultrasonic shaping devices (40) and the multiple thinning areas (712b) correspond one-to-one.

12. The electrode manufacturing equipment according to any one of claims 1-10, characterized in that, Also includes: The testing component is located downstream of the ultrasonic shaping device (40) in the conveying direction of the electrode strip (71) and is used to detect the thickness of the thinned area (712b) after being shaped by the ultrasonic shaping device (40). An adjustment device is used to adjust the position of the ultrasonic shaping device (40) relative to the thinning area (712b) according to the detection result of the test piece.

13. The electrode manufacturing equipment according to any one of claims 1-10, characterized in that, The conveying device (10) includes: A first conveyor roller (11) and a second conveyor roller (12) are arranged at intervals and in parallel for conveying the electrode strip (71). The coating device (20) is positioned opposite to the first conveying roller (11), and the ultrasonic shaping device (40) is positioned opposite to the second conveying roller (12).

14. The electrode manufacturing equipment according to claim 13, characterized in that, The conveying device (10) further includes: Multiple support rollers (13) are arranged in parallel and spaced apart between the first conveyor roller (11) and the second conveyor roller (12) to support the electrode strip (71). The drying device (30) includes an oven (31), and at least a portion of the support rollers (13) are located inside the oven (31).

15. A battery electrode, characterized in that, include: Current collector (711), the current collector (711) having a coated surface (711a); An active material layer (712) is disposed on the coating surface (711a) and includes a main body region (712a) and a thinning region (712b). In the width direction of the battery electrode (700), the thinning region (712b) is connected to the side of the main body region (712a) near the tab (73). The thickness of the main body region (712a) is greater than the thickness of the thinning region (712b). The thinning region (712b) has a shaping surface (712b1). The roughness of the shaping surface (712b1) is less than the roughness of the rest of the thinning region (712b).

16. The battery electrode according to claim 15, characterized in that, The shaping surface (712b1) extends along the length direction of the battery electrode (700), and the dimension of the shaping surface (712b1) in the width direction of the battery electrode (700) is 0.1mm-10mm.

17. The battery electrode according to claim 15, characterized in that, The shaping surface (712b1) is at least partially located at the edge of the thinning area (712b) away from the main body area (712a).

18. The battery electrode according to claim 15, characterized in that, The surface roughness Ra of the shaped surface (712b1) is less than or equal to 10 μm.

19. The battery electrode according to claim 15, characterized in that, The shaping surface (712b1) is at least partially a plane parallel to the coating surface (711a), or the shaping surface (712b1) is at least partially a plane or arc surface that gradually approaches the coating surface (711a) in a direction away from the main body area (712a), or the shaping surface (712b1) is at least partially a stepped surface.

20. A single battery cell, characterized in that, Includes the battery electrode (700) according to any one of claims 15-19.

21. A battery device, characterized in that, Includes the battery cell (800) according to claim 20.

22. An electrical appliance, characterized in that, It includes the battery cell (800) according to claim 20; or, it includes the battery device (900) according to claim 21.

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